Skip to main content


Front. Cell. Infect. Microbiol., 17 June 2020
Sec. Parasite and Host

Trypanosoma cruzi Promotes Transcriptomic Remodeling of the JAK/STAT Signaling and Cell Cycle Pathways in Myoblasts

Lindice M. Nisimura1, Laura L. Coelho2, Tatiana G. de Melo3, Paloma de Carvalho Vieira4, Pedro H. Victorino5, Luciana R. Garzoni2, David C. Spray6, Dumitru A. Iacobas7, Sanda Iacobas8, Herbert B. Tanowitz9 and Daniel Adesse4*
  • 1Laboratório de Pesquisa em Apicomplexa, Instituto Carlos Chagas, Fundação Oswaldo Cruz, Curitiba, Brazil
  • 2Laboratório de Inovações em Terapias, Ensino e Bioprodutos, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, Brazil
  • 3Laboratório de Ultraestrutura Celular, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, Brazil
  • 4Laboratório de Biologia Estrutural, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, Brazil
  • 5Laboratório de Neurogênese, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
  • 6Dominick P. Purpura Department of Neuroscience, Albert Einstein College of Medicine, New York, NY, United States
  • 7Personalized Genomics Laboratory, Center for Computational Systems Biology, Prairie View A&M University, Prairie View, TX, United States
  • 8Department of Pathology, New York Medical College, Valhalla, NY, United States
  • 9Department of Pathology, Albert Einstein College of Medicine, New York, NY, United States

Chagas disease is responsible for more than 10,000 deaths per year and about 6 to 7 million infected people worldwide. In its chronic stage, patients can develop mega-colon, mega-esophagus, and cardiomyopathy. Differences in clinical outcomes may be determined, in part, by the genetic background of the parasite that causes Chagas disease. Trypanosoma cruzi has a high genetic diversity, and each group of strains may elicit specific pathological responses in the host. Conflicting results have been reported in studies using various combinations of mammalian host—T. cruzi strains. We previously profiled the transcriptomic signatures resulting from infection of L6E9 rat myoblasts with four reference strains of T. cruzi (Brazil, CL, Y, and Tulahuen). The four strains induced similar overall gene expression alterations in the myoblasts, although only 21 genes were equally affected by all strains. Cardiotrophin-like cytokine factor 1 (Clcf1) was one of the genes found to be consistently upregulated by the infection with all four strains of T. cruzi. This cytokine is a member of the interleukin-6 family that binds to glycoprotein 130 receptor and activates the JAK/STAT signaling pathway, which may lead to muscle cell hypertrophy. Another commonly upregulated gene was tyrosine 3-monooxygenase/tryptophan 5-monooxygenase activation protein theta (Ywhaq, 14-3-3 protein Θ), present in the Cell Cycle Pathway. In the present work, we reanalyzed our previous microarray dataset, aiming at understanding in more details the transcriptomic impact that each strain has on JAK/STAT signaling and Cell Cycle pathways. Using Pearson correlation analysis between the expression levels of gene pairs in biological replicas from each pathway, we determined the coordination between such pairs in each experimental condition and the predicted protein interactions between the significantly altered genes by each strain. We found that although these highlighted genes were similarly affected by all four strains, the downstream genes or their interaction partners were not necessarily equally affected, thus reinforcing the idea of the role of parasite background on host cell transcriptome. These new analyses provide further evidence to the mechanistic understanding of how distinct T. cruzi strains lead to diverse remodeling of host cell transcriptome.


Chagas disease (CD) is caused by the protozoan Trypanosoma cruzi and affects about 6 to 7 million people worldwide (WHO, 2019). The cardiac form of CD (Mukherjee et al., 2003; Goldenberg et al., 2009; Soares et al., 2010; Adesse et al., 2011) is the main clinical manifestation, which can be observed in more than 30% of chronically infected people, whereas another 10% develop digestive, neurological, or mixed alterations (Rassi et al., 2010, 2012; WHO, 2019). These diverse presentations might in part be explained by genetic differences between strains of T. cruzi, which have been classified into six discrete typing units (DTUs) (Andrade and Magalhaes, 1997; Zingales et al., 2009). This classification is based on distinct ecological, epidemiological, natural, and experimental infection features of the parasite, but clinical manifestations are not strictly associated with the specific T. cruzi DTUs (Zingales et al., 2012). In order to understand the variations in CD severity and tissue specificity, there is a need to identify key molecular biomarkers and to correlate the gene expression profiles of T. cruzi strains with CD pathogenicity.

We previously compared gene expression profiles in a rat myoblast cell line (L6E9) infected with four different strains of T. cruzi (Brazil, Y, CL, and Tulahuen) (Adesse et al., 2010a). That study identified up regulation of cardiotrophin-like cytokine factor 1 (Clcf1) by all four strains of T. cruzi. Clcf1 belongs to the interleukin (IL)-6 family of cytokines that have the glycoprotein gp130 as a common signal-transducing receptor and is involved in cell differentiation, survival, apoptosis, and proliferation through activation of Janus kinase (JAK). JAKs in turn, activate signal transducer and activator of transcription (STAT) factors (Gorshkova et al., 2016). CLCF1 has been reported to induce hypertrophy and survival of cardiomyocytes in vitro (Sheng et al., 1996; Latchman, 1999) through gp130 and STAT3 pathway activation (Kunisada et al., 1998). Plasma levels of CLCF1 are correlated with severity of hypertrophy in patients with hypertrophic cardiomyopathy or hypertension (Monserrat et al., 2011; Song et al., 2014). In acute experimental CD, rats infected with T. cruzi (Sylvio X10/7 strain, TcI) revealed cardiac overexpression of CLCF1 and gp130 (Chandrasekar et al., 1998). These data could explain in part why the predominant DTUs in our previous study (TcI and TcII) are associated with cardiac manifestation of CD.

STAT proteins include STAT1–4, –5a, –5b, and –6 and have been shown to play an important role in cytokine signaling. These proteins are tyrosine phosphorylated by JAKs following the binding of cytokine to its receptor. Upon tyrosine phosphorylation, STAT proteins form homodimers or heterodimers and rapidly translocate to the nucleus and induce gene expression. Recent evidence has demonstrated the necessity of STAT3 in cell growth and transformation (Zong et al., 2000; Ponce et al., 2013; Stahl et al., 2013). The JAK/STAT pathway is involved in cell cycle regulation, and it has been shown that myoblast proliferation involves this pathway (Sorensen et al., 2018; Steyn et al., 2019). JAK1 and STAT1 induce cell proliferation and reduce myogenic differentiation (Sun et al., 2007). Additionally, phosphorylation of JAK2–STAT5 has been shown to protect skeletal muscle in acute aerobic exercise (Consitt et al., 2008).

Regarding T. cruzi infection, STAT3 phosphorylation induces cardiomyocyte protection against apoptosis through increased expression of anti-apoptotic factor Bcl-2 (Ponce et al., 2012). Cell cycle was modulated distinctly in cells infected with the Dm28c (type I) and the Y and CL-Brener T. cruzi stocks (type II), and there were different levels of apoptosis induction by each strain. Moreover, T. cruzi infection provoked variable apoptosis rates in distinct host cell types (cardiomyocytes, fibroblasts, and macrophages) (de Souza et al., 2003).

In this context, transcriptomic analyses may be expected to elucidate associations between the DTUs and prediction of the pathogenesis of T. cruzi strains. In the present study, we focus on determination of the transcriptomic impact of each strain on JAK/STAT signaling and cell cycle pathways. Novel bioinformatics tools were used to reanalyze the data generated by microarray analysis of L6E9 cells infected with four distinct strains of T. cruzi (Brazil, CL, Y, and Tulahuen).


Experimental Design

For microarrays analyses, rat skeletal myoblast L6E9 were used as described in Adesse et al. (2010a). Before reaching confluency, cells were dissociated with trypsin/EDTA in phosphate-buffered saline (PBS) and plated for experiments. Trypomastigotes of Trypanosoma cruzi were isolated from supernatants of infected Vero cells and used at a multiplicity of infection (MOI) of 10. Twenty-four hours after infection, cultures were washed twice with Ringer's saline solution and fresh supplemented medium was added. Medium was replaced daily and cultures were kept up to 72 h post infection.


Microarray data were obtained from our previous publication (Adesse et al., 2010a), and the experimental design and procedures are described in brief as follows. Cell culture dishes containing the L6E9 rat myoblast cell line were infected with trypomastigote forms of T. cruzi (Y, CL Brener, Tulahuen, and Brazil strains) (see Adesse et al., 2010a, for details). Total RNA was harvested 72 h post infection using TRIzol reagent (Invitrogen, Carlsbad, CA), following the protocol indicated by the manufacturer. Microarray analysis was performed using the protocol optimized in our laboratory according to the standards of the Microarray Gene Expression Data Society. Differently labeled RNA samples from biological replicas of control (uninfected cells cultured for the same duration) or infected with one strain at a time were co-hybridized (“multiple yellow” strategy) with rat oligonucleotide arrays printed by Duke University. The abundance of host cell transcripts was considered as significantly altered after infection if the absolute fold change was >1.5-fold and the P-value of the heteroscedastic t-test (two-sample, unequal variance) was >0.05. Experimental details and raw and processed expression data have been deposited and are publically available at

Expression Coordination Analysis

As previously described (Iacobas et al., 2008a), the gene networks in uninfected control L6E9 myocytes and those infected with each of the four strains (Brazil, CL, Tulahuen, or Y strain) were established by calculating pairwise Pearson correlation coefficients of the (log2) expression levels of each pair of pathway genes in the biological replicas. Two genes were considered as synergistically expressed if their expression levels increased and decreased together (positive covariance) in a set of similar samples or as antagonistically expressed (negative covariance) when they manifest opposite tendencies and as independently expressed when their expressions are not correlated (close to zero covariance). In the case of four biological replicas, the (p < 0.05) cut-off for synergism is a pairwise Pearson correlation coefficient ρ > 0.90, for antagonism ρ < −0.90, and for independence |ρ| < 0.05. To illustrate, Supplementary Figure 1 presents examples of synergistically (Antxr1), antagonistically (Dus3l), and independently (Golim4) expressed genes with Clcf1 in control L6E9 rat myoblasts.

“See-Saw” Partners of Key Genes

For each gene of interest and each experimental condition, we determined the coordination profile, defined as the set of Pearson correlation coefficients between the expression levels within biological replicas of that gene and each other gene. We then identified the gene pairs with very similar or opposite coordination profiles in each condition, termed “see-saw” partners, both in recognition of the appearance of the graphs and to denote the strength of their synergistic and antagonistic relationships (Iacobas et al., 2007a,b, 2008a,b; Spray and Iacobas, 2007).

Pathway Analysis

On the basis of our initial analyses of genes whose expression was altered by infection with different T. cruzi strains, we selected the following gene pathways for further analysis using the Kyoto Encyclopedia of Genes and Genomes (KEGG): a) JAK/STAT Signaling Pathway ( and b) Cell Cycle Pathway (


Differential Alterations in Predicted Protein–Protein Interactions (PPI) in L6E9 Myoblasts Infected With Distinct Trypanosoma cruzi Strains

In our previous paper (Adesse et al., 2010a), randomly selected genes were presented among those that were significantly altered by each strain of Trypanosoma cruzi. We now listed the 30 genes most downregulated and upregulated genes by each strain (Tables 18). Whereas the fold changes of the most strongly downregulated genes were similar (about −4- to −2-fold), fold changes of upregulated genes were as high as 13- to 54-fold in the various T. cruzi strains. The Y strain was the least disruptive for the transcriptome because fold changes of the 30 most strongly upregulated genes were notably lower than for the other strains.


Table 1. Top 30 upregulated genes by Brazil strain-infected L6E9 cells at 72 hpi.


Table 2. Top 30 downregulated genes by Brazil strain-infected L6E9 cells at 72 hpi.


Table 3. Top 30 upregulated genes by CL strain-infected L6E9 cells at 72 hpi.


Table 4. Top 30 downregulated genes by CL strain-infected L6E9 cells at 72 hpi.


Table 5. Top 30 upregulated genes by Tulahuen strain-infected L6E9 cells at 72 hpi.


Table 6. Top 30 downregulated genes by Tulahuen strain-infected L6E9 cells at 72 hpi.


Table 7. Top 30 upregulated genes by Y strain-infected L6E9 cells at 72 hpi.


Table 8. Top 30 downregulated genes by Y strain-infected L6E9 cells at 72 hpi.

We used the STRING platform to predict protein–protein interaction (PPI) networks and subsequently applied K-means algorithm to determine clusters of genes with a similar expression profile (Figure 1). The clusters that were generated were then analyzed by Pathvisio software (Kutmon et al., 2015), in order to determine their molecular function; these clusters and their associated functions are shown in Figure 1. Among 111 downregulated genes, the Brazil strain affected the “RNA processing,” “binding,” “transport,” and “cell cycle and cellular metabolic process” pathways, and 377 upregulated genes involved “RNA splicing,” “signal transduction and cellular response to stimulus,” “regulation of metabolic process,” and “protein binding.” The CL strain downregulated the expression of 53 genes, but only nine interactions were found among 14 regulated genes, belonging to the “cellular process,” “cellular metabolic process,” “catabolic process,” and “metabolic process” categories. Regarding the 764 genes of the L6E9 cells that were upregulated by the CL, we found a total of 884 interactions that could be grouped into three main biological processes: “ribosome biogenesis,” “RNA processing,” and “cell cycle and DNA repair.” By contrast, analysis of the Tulahuen-infected samples revealed that most of the 1,144 differentially expressed genes (DEGs) were downregulated (761 genes), which formed 494 interactions. Such interactions were grouped into four main clusters: “cellular component organization,” “RNA splicing,” “protein phosphorylation,” and “cellular protein metabolic process,” each with 22, 15, 22, and 18 genes, respectively. The remaining 383 DEGs by the Tulahuen strain were all upregulated and generated 146 interactions with four main biological processes: “cellular component biogenesis,” “biological regulation and signal transduction,” “signal transduction and cellular response to stimulus,” and “cell cycle and metabolic process” (Figure 1). Finally, we analyzed the DEGs from the Y strain-infected samples. We found a total of 68 and 44 predicted interactions when looking at 150 downregulated and 276 upregulated genes, respectively. Among the biological processes found among the downregulated network, we found “signal transduction and cellular response to stimulus,” “structural molecule activity,” “regulation of cell migration,” and “macromolecule metabolic process”; and in the upregulated genes, the “cell cycle,” “response to stimulus,” “cellular protein process,” and “cellular metabolic process” were found (Figure 1).


Figure 1. Protein–protein interaction (PPI) networks revealed by upregulated and downregulated genes after infection with each Trypanosoma cruzi strain. Among the downregulated (left panels) and upregulated genes (right panels), we obtained/assembled PPIs using STRING software, with a confidence cut-off that ranged from 0.4 to 0.7. Nodes labeled with the encoding gene symbol indicate proteins, and the lines represent the corresponding interactions. The confidence score of each interaction is mapped to the line thickness (the thicker the line, the more evidence to support the interaction). The network was then enriched according to a gene ontology database. Subsequent analysis with K-means algorithm predicted nodes of interacting proteins (highlighted with the dashed lines), and such nodes were determined with Pathvisio assigning their molecular functions.

Trypanosoma cruzi Strains Differentially Alter the Expression of JAK/STAT Signaling Pathway Members

As previously described, all four strains of T. cruzi induced upregulation of the Clcf1 transcript in infected rat myoblasts by 2.2-, 2.3-, 1.8-, and 2.3-fold by the Brazil, CL, Tulahuen, and Y strains, respectively. Because this cytokine is one of the known activators of the JAK/STAT signaling pathway, we investigated whether other genes in such pathway might be altered by all four strains, which would validate JAK/STAT activation as a hallmark of T. cruzi infection. Using KEGG pathway database, we highlighted which genes were significantly upregulated or downregulated by each parasite strain (Figure 2). We found that the CL strain, an isolate from the southern part of Brazil (TcVI), had the highest impact on JAK/STAT signaling pathway, inducing alteration in 37% of the 30 genes detected by the arrays. The Tulahuen strain, a Chilean isolate (also TcVI), altered 30% of the genes, whereas the Brazil and Y strains showed fewer pathway elements altered (3/30:10% and 5/30: 17%, respectively). In initial steps of this signaling cascade, the Brazil and CL strains upregulated only Clcf1 expression, whereas the Tulahuen strain also induced overexpression of IL-11 (1.7-fold), IL-21 (9.4-fold), and colony stimulating factor 3 receptor (2.3-fold). The Y strain also led to increased expression of IL-21 transcript (4.4-fold). Concerning the membrane receptors that trigger JAK/STAT signaling, we found that the Brazil and Tulahuen strains both induced upregulation of prolactin receptor (Prlr, 3.5- and 3.9-fold, respectively). Cells infected with the CL strain showed increased expression of IL-3 (1.9-fold) and IL-21 (3.0-fold) receptors, as well as IFN-α receptor 1 (IfnaR1, 1.8-fold). The Y strain also increased the expression of IL-21 receptor (2.5-fold). Other constituents of this pathway were altered by the Y and CL strains: PIAS4 was upregulated by 1. 6- and 2.0-fold, respectively. Conversely, the Tulahuen strain downregulated expression of protein inhibitor of STAT1 and STAT3 (PIAS1 and PIAS3) by 1.7- and 2.5-fold, respectively (Figure 2).


Figure 2. Kyoto Encyclopedia of Genes and Genomes (KEGG) analysis of the JAK/STAT Pathway in Trypanosoma cruzi-infected myoblasts. The JAK/STAT Pathway obtained from the KEGG platform was used as template to highlight the effect of Brazil (A), CL (B), Tulahuen (C), and Y (D) strain in L6E9 rat myoblasts. Blue boxes indicate significant upregulation (>1.5-fold), and red boxes indicate significant downregulation (<-1.5-fold). Yellow boxes indicate genes that showed no significant alteration in infected vs. control cultures, whereas white boxes indicate genes that were absent in the analysis (i.e., those that for any reason did not match the exclusion criteria; e.g., a positive signal in all four biological replicas of each group). Extracellular ligands such as IL-6 family of cytokines bind to membrane receptors, including IL-3R and IL-21R, which in turn activate members of the JAK/STAT pathway or, alternatively, of the MAPK signaling pathway. STATs translocate to cell nucleus and activate transcription of genes that can activate cell cycle, apoptosis, or cell differentiation.

Distinct Modulation in Cell Cycle Pathway by Trypanosoma cruzi Strains

JAK/STAT pathway activation may lead to changes in cell cycle components, and one of these (Tyrosine 3-Monooxygenase/Tryptophan 5-Monooxygenase Activation Protein Theta: Ywhaq) was one of the few genes found to be upregulated by all four strains studied (Adesse et al., 2010a). In addition, three out of the four strains used in this work led to increased expression of Cyclin D1 (Ccnd1), a major player in the cell cycle pathway, as has also been previously reported (Bouzahzah et al., 2008). Thus, we investigated how T. cruzi altered the cell cycle pathway by using KEGG templates (Figure 3), and the findings are described below.


Figure 3. Kyoto Encyclopedia of Genes and Genomes (KEGG) analysis of the Cell Cycle Pathway in Trypanosoma cruzi-infected myoblasts. The Cell Cycle Pathway obtained from the KEGG platform was used as template to highlight the effect of Brazil (A), CL (B), Tulahuen (C), and Y (D) strain in L6E9 rat myoblasts. Blue boxes indicate genes that were significantly upregulated (>1.5-fold), and red boxes indicate those that were significantly downregulated (<-1.5-fold). Yellow boxes indicate genes that showed no significant alteration in infected vs. control cultures, and white boxes indicate genes that were absent in the analysis (i.e., those that for any reason did not match the exclusion criteria; e.g., a positive signal in all four biological replicas of each group). Distinct stimuli can regulate the expression of cyclins and cyclin-dependent kinases (CDKs) and transcription factors (E2F5, and E2F1, 2, and 3) that coordinate cell cycle progression, DNA biosynthesis, and S-phase protein synthesis.

The cell cycle pathway was most altered by the CL and Tulahuen strains showing 22% (12 of 55 analyzed spots) and 27% (15/55 spots) altered genes, respectively. The Brazil strain (TcI) and Y strain (isolated from São Paulo state, Brazil, TcII) had an impact on these two pathways, although to a lesser extent, affecting eight and five of the 55 measured genes, respectively. Specific Cell Cycle Pathway genes whose expression was altered following infection are described below.

In the Brazil strain, upregulated genes included cyclin-dependent kinase inhibitor 1B (Cdkn1b, 2.3-fold); ATM serine/threonine kinase (ATM, 2.9-fold); checkpoint kinase 1 homolog (Chek1, 2.3-fold), and MAD2 (mitotic arrest deficient, homolog)-like 1 (Mad2l1, 1.8-fold). Downregulated genes includes SMAD family member 2 (SMAD2, −1.5-fold) and cell division cycle 7 (Cdc7, −1.8-fold). Whereas the theta polypeptide of tyrosine 3-monooxygenase/tryptophan 5-monooxygenase activation protein (Ywhaq) was upregulated (2.9-fold), the zeta polypeptide (Ywhaz) was downregulated (−1.9-fold) (Figure 3A).

In the CL strain, upregulated genes included Cyclin D1 (CycD, 2.0-fold), histone deacetylase 1 (HDAC1, 1.6-fold), cyclin dependent kinase 2 (Cdk2, 2.0-fold), proliferating cell nuclear antigen (PCNA, 1.8-fold), growth arrest and DNA-damage-inducible beta (Gadd45b, 2.1-fold), Checkpoint kinase 1 homolog (Chek1, 3.5-fold), protein kinase, membrane associated tyrosine/threonine 1 (Pkmyt1, 1.8-fold), MAD2 (mitotic arrest deficient, homolog)-like 1 (yeast) (Mad2l1, 1.9-fold), anaphase promoting complex subunit 2 (Anapc2, 1.8-fold), and cell division cycle 20 (Cdc20, 2.9-fold). Regarding the members of the 14-3-3 complex, CL infection upregulated the theta polypeptide (Ywhaq, 2.9-fold) (Figure 3B).

The Tulahuen strain was very disruptive for cell cycle genes, with 27% significantly altered. Upregulated genes included S-phase kinase-associated protein 1 (Skp1a, 2-fold), CyclinD1 (Ccnd1, 2-fold), cyclin-dependent kinase inhibitor 1B (Cdkn1b, 1.7-fold), minichromosome maintenance deficient 2 mitotin (MCM2, 1.5-fold), fizzy/cell division cycle 20 related 1 (Fzr1, 2.3-fold), cell division cycle 20 homolog (Cdc20, 1.8-fold), proliferating cell nuclear antigen (PCNA, 1.6-fold). Downregulated genes included MAD homolog 2 (SMAD2, −1.9-fold), MAD homolog 4 (SMAD4, −1.7-fold), V-abl Abelson murine leukemia viral oncogene homolog 1 (Abl1, −3.3-fold), protein kinase, DNA activated, catalytic polypeptide (Prkdc, −1.8-fold), and tumor protein p53 (tp53, −1.9-fold). Three members of the tyrosine 3-monooxygenase/tryptophan 5-monooxygenase activation protein were affected by the Tulahuen strain infection: downregulated the eta (Ywhah, −1.8-fold) and zeta (Ywhaz, −1.8-fold), and upregulated the theta (Ywhaq, 1.8-fold) (Figure 3C).

The Y strain was the least disruptive for the cell cycle pathway, leading to upregulation of glycogen synthase kinase 3 beta (Gsk3b 1.5-fold), cyclin-dependent kinase inhibitor 2B (Cdkn2b, 1.7-fold), Ywhaq (2.6-fold), and downregulation of anaphase promoting complex subunit 4 (Anapc4, −1.6-fold) (Figure 3D).

Expression Coordination

The pathway expression analysis shown in Figures 2, 3 provides information on whether genes within a pathway are individually affected by a treatment or condition but does not indicate whether expression of genes within a pathway is coordinately expressed. To examine this issue, we used pairwise Pearson coefficients to determine whether expression differences in individual samples were correlated with one another, possibly indicating that the encoded proteins may be functionally interlinked (Spray and Iacobas, 2007, Figure 4).


Figure 4. Trypanosoma cruzi infection affects the coordination of genes belonging to JAK/STAT and cell cycle pathways. The number of synergisms (blue bars) and antagonisms (red bars) for the JAK/STAT (A) and Cell Cycle (B) pathways are shown, as determined by Pearson correlation analysis. The circles in (C,D) depict the synergistic (blue lines) and antagonistic (red lines) correlations between genes of each pathway, in uninfected and T. cruzi-infected datasets.

From these measurements, we determined the number of gene pairs with significant pairwise Pearson correlation coefficients, with synergistic correlations shown in blue and antagonistic in red in Figures 4A,B. Graphical representation of the coordination interactions (synergistic and antagonistic) of genes in the JAK/STAT and Cell Cycle pathways are shown in Figures 4C,D, respectively.

In the non-infected control group, the JAK/STAT signaling pathway had 16 synergistic and six antagonistic coordination. Samples obtained for each of the four strains exhibited higher numbers of synergisms (27, 29, 23, and 21 for Brazil, CL, Tulahuen, and Y, respectively); antagonistic correlations for the Brazil, Talahuen, and Y strains were similar to those of control (six antagonisms each) (Figure 4A). The CL strain induced a much higher number of antagonisms (24) (Figures 4A,C).

In the Cell Cycle Pathway, the control group showed 113 synergisms and 65 antagonisms. In contrast to what was observed in gene coordination in the JAK/STAT signaling pathway, T. cruzi infection by all strains resulted in fewer synergisms (ranging from 74 to 81, Figures 4B–D).

Additionally, we determined whether infection by each of the T. cruzi strains altered the number of correlations of the JAK/STAT (Figure 5A) and Cell Cycle genes (Figure 5B) with all other genes quantified on the arrays. Overall, the number of neutral correlations was fairly constant for genes in both pathways, and negative correlations were similar except for a larger number in the CL genes in the JAK/STAT pathway. By contrast, the number of positive associations was higher in all infected than uninfected groups for JAK/STAT and lower in all infected groups for the Cell Cycle Pathway. To illustrate the effect that T. cruzi infection had on coordination between members of the JAK/STAT pathway, we show in Figure 5C the coordination profile between STAT3 and caveolin-1. In the control condition (shown in black), these two genes had a neutral profile (corresponding to a broad ellipse covering all quadrants of the graph), which was altered to a variably narrow but significantly positive profile in each of the infected conditions (shown in red). An example of conversion of a coordination of Cell Cycle genes from a positive coordination under control conditions to a neutral profile in infected cells is shown in Figure 5D. Uninfected cultures displayed a positive profile (black dots) for the Ywaq and Ywhaz pair of genes. In infected samples from each strain (shown in red), the coordination changed to a neutral profile.


Figure 5. Differential effects of infection on global gene correlation. Plots of correlation coefficients between the expression levels of the indicated genes with each other genes differentially expressed in each experimental condition. The number of neutral (black bars), positive (blue bars), and negative correlations (yellow bars) was quantified among genes belonging to the JAK/STAT (A) and Cell Cycle (B) pathways. T. cruzi infection increased the number of positive correlations of the JAK/STAT pathway, whereas an opposite effect was observed for Cell Cycle genes. In (C,D) are depicted representative correlation profiles of each pathway: cav-1 and stat3 of the JAK/STAT pathway (C) and YWHAZ and YWHAQ of the Cell Cycle Pathway (D). Profiles of the uninfected controls are represented by the black dots and T. cruzi-infected by red dots.


Trypanosoma cruzi infection results in CD that has different clinical forms that include asymptomatic, cardiac, digestive, and neurological features (WHO, 2019). These diverse outcomes may be related to the environment, host, and parasite genetic variability (Lewis et al., 2016) and by a combination of all these variables. T. cruzi genetic isolates are currently divided into six DTUs according to genetic, biochemical, and/or biological markers (Zingales et al., 2009); and strains from TcII, TcV, or TcVI were associated with chronic infection (Zingales, 2018). Here, we reanalyzed data from a previously published transcriptomic profiling of the infection of rat myoblasts by four T. cruzi strains, in order to further understand the impact that infection has on JAK/STAT signaling and cell cycle pathways and to understand the different outcomes of infection.

One of the few genes showing increased expression increased by all four strains of T. cruzi was Clcf1 (Adesse et al., 2010a). CLCF1 belongs to the IL-6 cytokine family that includes IL-6, IL-11, ciliary neurotrophic factor (CNTF), leukemia inhibitory factor (LIF), oncostatin M (OSM), cardiotrophin 1 (CT-1), and IL-27.

Cytokines and growth factors commonly mediate their actions through the JAK/STAT pathway, which is associated with such cellular functions as inflammation, apoptosis, and cell-cycle control (Barry et al., 2007). IL-6 and IL-10 induce STAT3 activity (Barry et al., 2007). In Tulahuen strain infection, IL-6/pSTAT3 protects cardiomyocytes through upregulation of anti-apoptotic factor Bcl-2 (Ponce et al., 2012), thus maintaining the survival of the host cell that is beneficial for parasite persistence. IL-10/STAT3 signaling induces the SOCS-3 gene reducing tissue damage inducers such as pro-inflammatory factors nitric oxide synthase (NOS2) and tumor necrosis factor (TNF)-α in T. cruzi RA strain-infected cardiomyocytes culture (Hovsepian et al., 2013).

IFNs activate predominantly STAT1 and STAT2 (Barry et al., 2007). IFNγ/STAT1 signaling protected fibroblasts against CL Brener and Y infection by inhibition of amastigote growth (Stahl et al., 2014) that could explain the higher T. cruzi (Brazil strain) replication and dissemination in STAT1 knockout mice (Kulkarni et al., 2015). Interestingly, infection of STAT6- but not STAT4-knockout mice with this same (Brazil) strain resulted in decreased parasitemia, inflammation, and mortality when compared with wild-type mice (Tarleton et al., 2000). Therefore, different ways of modulating this pathway may induce different clinical aspects of the infection.

Our results showed that three out of four isolates of T. cruzi that were tested had nodules of predicted PPI of Cell Cycle process within their upregulated genes and that one (Brazil) had such interactions among the downregulated genes. Regarding the pairwise coordination profiling of genes belonging to the cell cycle pathway, we verified an overall reduction of synergistic interactions induced by all four strains. Accordingly, infection of L6E9 myoblasts by the Brazil strain led to no significant alteration of cyclin D1 promotor activity or cyclin D1 protein stability in infected cultures (Bouzahzah et al., 2008).

It is well-documented that T. cruzi affects host cell proliferation (Bouzahzah et al., 2006; Droguett et al., 2017; Duran-Rehbein et al., 2017). Curiously, one work that utilized the Y strain of T. cruzi showed that late mitotic genes were downregulated in infected cultures of vascular smooth muscle cells and fibroblasts (Costales et al., 2009), indicating defects in cytokinesis. This finding reinforces the fact that host cell or even host animal background plays a complimentary role on the course of infection. This seems to be the case of vascular smooth cells that were shown to have increased proliferation when infected by the Tulahuen strain of this parasite (Hassan et al., 2006).

Interestingly, our study showed that infected cultures had a decrease in the number of neutral correlations in JAK/STAT-related genes and an increase in the number of positive profiles. We exemplified this phenomenon with the correlation of caveolin-1 and STAT3. Caveolins are implicated in transcytosis of macromolecules, cholesterol transport, and signal transduction (Li et al., 2005). Knockout mice for caveolin-1, caveolin-2, and caveolin-3 develop hypertrophic cardiomyopathy with increase in fibrosis (Park et al., 2002; Cohen et al., 2003; Augustus et al., 2008). Experimental CD in mice also affects caveolins (Adesse et al., 2010b), with subsequent activation of MAPK signaling pathways (Huang et al., 2003), thus leading to remodeling of heart tissue.

The tyrosine 3-monooxygenase/tryptophan 5-monooxygenase activation proteins are a family of molecular chaperones commonly referred to as 14-3-3 proteins. The family consists of seven transcripts in mammals: 14-3-3β (YWHAB), 14-3-3γ (YWHAG), 14-3-3ε (YWHAE), 14-3-3ζ (YWHAZ), 14-3-3η (YWHAH), 14-3-3θ (YWHAQ), and 14-3-3σ also known as stratifin (SFN) (MacKay et al., 2011). YWHAH for instance has a well-established cardioprotective role in cases of cardiac overload. Mice with a dominant mutation in 14-3-3 proteins display reduced survival, left ventricular fraction, and fraction shortening (Thandavarayan et al., 2011; Sreedhar et al., 2016). The fact that 14-3-3 transcripts are altered in myoblasts infected with T. cruzi reinforces the idea that 14-3-3 proteins may contribute to cardiomyocyte apoptosis, inflammation, fibrosis, and hypertrophy observed in cardiac forms of Chagas chronic disease.

In summary, the bioinformatic tools used in this work allowed the further description of the differential impact of T. cruzi genetic background on host cell transcriptome, as a good predictor of biological outcomes. Although Clcf-1 and Ywhaq were equally altered in the infected L6E9 cells, their network ensemble was in fact composed of different transcripts, which may lead to variations in the degrees of activations in these molecular pathways. These observations are important to deepen the understanding of how CD can present multiple pathologies, according to parasite background, combined with host diversity and environmental aspects. Such variability should be taken in consideration when proposing chemotherapeutic or immunomodulatory approaches to control of this disease.

Data Availability Statement

The raw datasets generated in this study can be found in NCBI, accession number GSE18175.

Author Contributions

DA, LG, DS, HT, and DI conceptualized the study. DA, DI, and DS contributed to methodology, resources, and funding acquisition. PCV, PHV, LN, TM, and LC helped with the validation. SI, DI, and TM did the formal analysis. DA, LN, PCV, PHV, LC, and TM carried out the investigation. DA and LN contributed to data curation and writing the original draft. DA, LG, DS, and DI wrote, reviewed, and edited the manuscript. DA was responsible for the visualization and project administration. DA, DI, DS, and HT supervised the study. All authors contributed to the article and approved the submitted version.


This work was supported by Conselho Nacional de Pesquisa e Desenvolvimento Tecnológico (CNPq, grant Numbers: 401772/2015-2 and 444478/2014-0) and Fundação Oswaldo Cruz (Fiocruz), through the INOVA Fiocruz program, grant number 3231984391 for DA. DI was supported by the Chancellor's Research Initiative (CRI) funding for the Center for Computational Systems Biology at the Prairie View A&M University. DS was supported by NIH grant number NS092466.

Conflict of Interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.


The authors thank Mrs. Heloisa Diniz from the Department of Image Production and Processing (Serviço de Produção e Tratamento de Imagem—IOC) at the Oswaldo Cruz Institute for help in generating the schematic images presented in Figures 1–4. They also thank Dr. Helene Santos Barbosa (Laboratory of Structural Biology, IOC) for providing equipment, laboratory facility, and some reagents.

Supplementary Material

The Supplementary Material for this article can be found online at:

Supplementary Figure 1. Examples of genes synergistically (Antxr1 = ANTXR cell adhesion molecule 1), antagonistically (Dus3l = dihydrouridine synthase 3-like), and independently (Golim4 = golgi integral membrane protein 4) expressed genes with Clcf1 (cardiotrophin-like cytokine factor 1) in control L6E9 rat myoblasts. Numbers in brackets are the Pearson correlation coefficients.


Adesse, D., Goldenberg, R. C., Fortes, F. S., Iacobas, D. A., Iacobas, S., Huang, H., et al. (2011). Gap junctions and chagas disease. Adv. Parasitol. 76, 63–81. doi: 10.1016/B978-0-12-385895-5.00003-7

PubMed Abstract | CrossRef Full Text | Google Scholar

Adesse, D., Iacobas, D. A., Iacobas, S., Garzoni, L. R., Meirelles Mde, N., Tanowitz, H. B., et al. (2010a). Transcriptomic signatures of alterations in a myoblast cell line infected with four distinct strains of Trypanosoma cruzi. Am. J. Trop. Med. Hyg. 82, 846–854. doi: 10.4269/ajtmh.2010.09-0399

PubMed Abstract | CrossRef Full Text | Google Scholar

Adesse, D., Lisanti, M. P., Spray, D. C., Machado, F. S., Meirelles Mde, N., Tanowitz, H. B., et al. (2010b). Trypanosoma cruzi infection results in the reduced expression of caveolin-3 in the heart. Cell Cycle 9, 1639–1646. doi: 10.4161/cc.9.8.11509

PubMed Abstract | CrossRef Full Text | Google Scholar

Andrade, S. G., and Magalhaes, J. B. (1997). Biodemes and zymodemes of Trypanosoma cruzi strains: correlations with clinical data and experimental pathology. Rev. Soc. Bras. Med. Trop. 30, 27–35. doi: 10.1590/S0037-86821997000100006

PubMed Abstract | CrossRef Full Text | Google Scholar

Augustus, A. S., Buchanan, J., Gutman, E., Rengo, G., Pestell, R. G., Fortina, P., et al. (2008). Hearts lacking caveolin-1 develop hypertrophy with normal cardiac substrate metabolism. Cell Cycle 7, 2509–2518. doi: 10.4161/cc.7.16.6421

PubMed Abstract | CrossRef Full Text | Google Scholar

Barry, S. P., Townsend, P. A., Latchman, D. S., and Stephanou, A. (2007). Role of the JAK-STAT pathway in myocardial injury. Trends Mol. Med. 13, 82–89. doi: 10.1016/j.molmed.2006.12.002

PubMed Abstract | CrossRef Full Text | Google Scholar

Bouzahzah, B., Nagajyothi, F., Desruisseaux, M. S., Krishnamachary, M., Factor, S. M., Cohen, A. W., et al. (2006). Cell cycle regulatory proteins in the liver in murine Trypanosoma cruzi infection. Cell Cycle 5, 2396–2400. doi: 10.4161/cc.5.20.3380

PubMed Abstract | CrossRef Full Text | Google Scholar

Bouzahzah, B., Yurchenko, V., Nagajyothi, F., Hulit, J., Sadofsky, M., Braunstein, V. L., et al. (2008). Regulation of host cell cyclin D1 by Trypanosoma cruzi in myoblasts. Cell Cycle 7, 500–503. doi: 10.4161/cc.7.4.5327

PubMed Abstract | CrossRef Full Text | Google Scholar

Chandrasekar, B., Melby, P. C., Pennica, D., and Freeman, G. L. (1998). Overexpression of cardiotrophin-1 and gp130 during experimental acute chagasic cardiomyopathy. Immunol. Lett. 61, 89–95. doi: 10.1016/S0165-2478(97)00167-3

PubMed Abstract | CrossRef Full Text | Google Scholar

Cohen, A. W., Park, D. S., Woodman, S. E., Williams, T. M., Chandra, M., Shirani, J., et al. (2003). Caveolin-1 null mice develop cardiac hypertrophy with hyperactivation of p42/44 MAP kinase in cardiac fibroblasts. Am. J. Physiol. Cell Physiol. 284, C457–474. doi: 10.1152/ajpcell.00380.2002

PubMed Abstract | CrossRef Full Text | Google Scholar

Consitt, L. A., Wideman, L., Hickey, M. S., and Morrison, R. F. (2008). Phosphorylation of the JAK2-STAT5 pathway in response to acute aerobic exercise. Med. Sci. Sports Exerc. 40, 1031–1038. doi: 10.1249/MSS.0b013e3181690760

PubMed Abstract | CrossRef Full Text | Google Scholar

Costales, J. A., Daily, J. P., and Burleigh, B. A. (2009). Cytokine-dependent and-independent gene expression changes and cell cycle block revealed in Trypanosoma cruzi-infected host cells by comparative mRNA profiling. BMC Genomics 10:252. doi: 10.1186/1471-2164-10-252

PubMed Abstract | CrossRef Full Text | Google Scholar

de Souza, E. M., Araujo-Jorge, T. C., Bailly, C., Lansiaux, A., Batista, M. M., Oliveira, G. M., et al. (2003). Host and parasite apoptosis following Trypanosoma cruzi infection in in vitro and in vivo models. Cell Tissue Res. 314, 223–235. doi: 10.1007/s00441-003-0782-5

PubMed Abstract | CrossRef Full Text | Google Scholar

Droguett, D., Carrillo, I., Castillo, C., Gomez, F., Negrete, M., Liempi, A., et al. (2017). Trypanosoma cruzi induces cellular proliferation in the trophoblastic cell line BeWo. Exp. Parasitol. 173, 9–17. doi: 10.1016/j.exppara.2016.12.005

PubMed Abstract | CrossRef Full Text | Google Scholar

Duran-Rehbein, G. A., Vargas-Zambrano, J. C., Cuellar, A., Puerta, C. J., and Gonzalez, J. M. (2017). Induction of cellular proliferation in a human astrocytoma cell line by a Trypanosoma cruzi-derived antigen: a mechanism of pathogenesis? Cell. Mol. Biol. 63, 23–27. doi: 10.14715/cmb/2017.63.1.5

PubMed Abstract | CrossRef Full Text | Google Scholar

Goldenberg, R. C., Iacobas, D. A., Iacobas, S., Rocha, L. L., da Silva de Azevedo Fortes, F., Vairo, L., et al. (2009). Transcriptomic alterations in Trypanosoma cruzi-infected cardiac myocytes. Microbes Infect. 11, 1140–1149. doi: 10.1016/j.micinf.2009.08.009

PubMed Abstract | CrossRef Full Text | Google Scholar

Gorshkova, E. A., Nedospasov, S. A., and Shilov, E. S. (2016). Evolutionary plasticity of IL-6 cytokine family. Mol. Biol. 50, 918–926. doi: 10.1134/S0026893316060066

PubMed Abstract | CrossRef Full Text | Google Scholar

Hassan, G. S., Mukherjee, S., Nagajyothi, F., Weiss, L. M., Petkova, S. B., de Almeida, C. J., et al. (2006). Trypanosoma cruzi infection induces proliferation of vascular smooth muscle cells. Infect. Immun. 74, 152–159. doi: 10.1128/IAI.74.1.152-159.2006

PubMed Abstract | CrossRef Full Text | Google Scholar

Hovsepian, E., Penas, F., Siffo, S., Mirkin, G. A., and Goren, N. B. (2013). IL-10 inhibits the NF-kappaB and ERK/MAPK-mediated production of pro-inflammatory mediators by up-regulation of SOCS-3 in Trypanosoma cruzi-infected cardiomyocytes. PLoS ONE 8:e79445. doi: 10.1371/journal.pone.0079445

PubMed Abstract | CrossRef Full Text | Google Scholar

Huang, H., Petkova, S. B., Cohen, A. W., Bouzahzah, B., Chan, J., Zhou, J. N., et al. (2003). Activation of transcription factors AP-1 and NF-kappa B in murine chagasic myocarditis. Infect. Immun. 71, 2859–2867. doi: 10.1128/IAI.71.5.2859-2867.2003

PubMed Abstract | CrossRef Full Text | Google Scholar

Iacobas, D. A., Fan, C., Iacobas, S., and Haddad, G. G. (2008a). Integrated transcriptomic response to cardiac chronic hypoxia: translation regulators and response to stress in cell survival. Funct. Integr. Genomics 8, 265–275. doi: 10.1007/s10142-008-0082-y

PubMed Abstract | CrossRef Full Text | Google Scholar

Iacobas, D. A., Iacobas, S., and Spray, D. C. (2007a). Connexin43 and the brain transcriptome of newborn mice. Genomics 89, 113–123. doi: 10.1016/j.ygeno.2006.09.007

PubMed Abstract | CrossRef Full Text | Google Scholar

Iacobas, D. A., Iacobas, S., and Spray, D. C. (2007b). Connexin-dependent transcellular transcriptomic networks in mouse brain. Prog. Biophys. Mol. Biol. 94, 169–185. doi: 10.1016/j.pbiomolbio.2007.03.015

PubMed Abstract | CrossRef Full Text | Google Scholar

Iacobas, D. A., Iacobas, S., Urban-Maldonado, M., Scemes, E., and Spray, D. C. (2008b). Similar transcriptomic alterations in Cx43 knockdown and knockout astrocytes. Cell Commun. Adhes. 15, 195–206. doi: 10.1080/15419060802014222

PubMed Abstract | CrossRef Full Text | Google Scholar

Kulkarni, M. M., Varikuti, S., Terrazas, C., Kimble, J. L., Satoskar, A. R., and McGwire, B. S. (2015). Signal transducer and activator of transcription 1 (STAT-1) plays a critical role in control of Trypanosoma cruzi infection. Immunology 145, 225–231. doi: 10.1111/imm.12438

CrossRef Full Text | Google Scholar

Kunisada, K., Tone, E., Fujio, Y., Matsui, H., Yamauchi-Takihara, K., and Kishimoto, T. (1998). Activation of gp130 transduces hypertrophic signals via STAT3 in cardiac myocytes. Circulation 98, 346–352. doi: 10.1161/01.CIR.98.4.346

PubMed Abstract | CrossRef Full Text | Google Scholar

Kutmon, M., van Iersel, M. P., Bohler, A., Kelder, T., Nuner, N., Pico, A. R., et al. (2015). PathVisio 3: an extendable pathway analysis toolbox. PLoS Comput. Biol. 11:e1004085. doi: 10.1371/journal.pcbi.1004085

PubMed Abstract | CrossRef Full Text | Google Scholar

Latchman, D. S. (1999). Cardiotrophin-1 (CT-1): a novel hypertrophic and cardioprotective agent. Int. J. Exp. Pathol. 80, 189–196. doi: 10.1046/j.1365-2613.1999.00114.x

PubMed Abstract | CrossRef Full Text | Google Scholar

Lewis, M. D., Francisco, A. F., Taylor, M. C., Jayawardhana, S., and Kelly, J. M. (2016). Host and parasite genetics shape a link between Trypanosoma cruzi infection dynamics and chronic cardiomyopathy. Cell. Microbiol. 18, 1429–1443. doi: 10.1111/cmi.12584

PubMed Abstract | CrossRef Full Text | Google Scholar

Li, J., Scherl, A., Medina, F., Frank, P. G., Kitsis, R. N., Tanowitz, H. B., et al. (2005). Impaired phagocytosis in caveolin-1 deficient macrophages. Cell Cycle 4, 1599–1607. doi: 10.4161/cc.4.11.2117

PubMed Abstract | CrossRef Full Text | Google Scholar

MacKay, R. K., Colson, N. J., Dodd, P. R., and Lewohl, J. M. (2011). Differential expression of 14-3-3 isoforms in human alcoholic brain. Alcohol. Clin. Exp. Res. 35, 1041–1049. doi: 10.1111/j.1530-0277.2011.01436.x

PubMed Abstract | CrossRef Full Text | Google Scholar

Monserrat, L., Lopez, B., Gonzalez, A., Hermida, M., Fernandez, X., Ortiz, M., et al. (2011). Cardiotrophin-1 plasma levels are associated with the severity of hypertrophy in hypertrophic cardiomyopathy. Eur. Heart J. 32, 177–183. doi: 10.1093/eurheartj/ehq400

PubMed Abstract | CrossRef Full Text | Google Scholar

Mukherjee, S., Belbin, T. J., Spray, D. C., Iacobas, D. A., Weiss, L. M., Kitsis, R. N., et al. (2003). Microarray analysis of changes in gene expression in a murine model of chronic chagasic cardiomyopathy. Parasitol. Res. 91, 187–196. doi: 10.1007/s00436-003-0937-z

PubMed Abstract | CrossRef Full Text | Google Scholar

Park, D. S., Woodman, S. E., Schubert, W., Cohen, A. W., Frank, P. G., Chandra, M., et al. (2002). Caveolin-1/3 double-knockout mice are viable, but lack both muscle and non-muscle caveolae, and develop a severe cardiomyopathic phenotype. Am. J. Pathol. 160, 2207–2217. doi: 10.1016/S0002-9440(10)61168-6

PubMed Abstract | CrossRef Full Text | Google Scholar

Ponce, N. E., Cano, R. C., Carrera-Silva, E. A., Lima, A. P., Gea, S., and Aoki, M. P. (2012). Toll-like receptor-2 and interleukin-6 mediate cardiomyocyte protection from apoptosis during Trypanosoma cruzi murine infection. Med. Microbiol. Immunol. 201, 145–155. doi: 10.1007/s00430-011-0216-z

PubMed Abstract | CrossRef Full Text | Google Scholar

Ponce, N. E., Carrera-Silva, E. A., Pellegrini, A. V., Cazorla, S. I., Malchiodi, E. L., Lima, A. P., et al. (2013). Trypanosoma cruzi, the causative agent of Chagas disease, modulates interleukin-6-induced STAT3 phosphorylation via gp130 cleavage in different host cells. Biochim. Biophys. Acta 1832, 485–494. doi: 10.1016/j.bbadis.2012.12.003

PubMed Abstract | CrossRef Full Text | Google Scholar

Rassi, A. Jr., Rassi, A., and Marcondes de Rezende, J. (2012). American trypanosomiasis (Chagas disease). Infect. Dis. Clin. North Am. 26, 275–291. doi: 10.1016/j.idc.2012.03.002

PubMed Abstract | CrossRef Full Text | Google Scholar

Rassi, A. Jr., Rassi, A., and Marin-Neto, J. A. (2010). Chagas disease. Lancet 375, 1388–1402. doi: 10.1016/S0140-6736(10)60061-X

PubMed Abstract | CrossRef Full Text | Google Scholar

Sheng, Z., Pennica, D., Wood, W. I., and Chien, K. R. (1996). Cardiotrophin-1 displays early expression in the murine heart tube and promotes cardiac myocyte survival. Development 122, 419–428.

PubMed Abstract | Google Scholar

Soares, M. B., de Lima, R. S., Rocha, L. L., Vasconcelos, J. F., Rogatto, S. R., dos Santos, R. R., et al. (2010). Gene expression changes associated with myocarditis and fibrosis in hearts of mice with chronic chagasic cardiomyopathy. J. Infect. Dis. 202, 416–426. doi: 10.1086/653481

PubMed Abstract | CrossRef Full Text | Google Scholar

Song, K., Wang, S., Huang, B., Luciano, A., Srivastava, R., and Mani, A. (2014). Plasma cardiotrophin-1 levels are associated with hypertensive heart disease: a meta-analysis. J. Clin. Hypertens. 16, 686–692. doi: 10.1111/jch.12376

PubMed Abstract | CrossRef Full Text | Google Scholar

Sorensen, J. R., Fuqua, J. D., Deyhle, M. R., Parmley, J., Skousen, C., Hancock, C., et al. (2018). Preclinical characterization of the JAK/STAT inhibitor SGI-1252 on skeletal muscle function, morphology, and satellite cell content. PLoS ONE 13:e0198611. doi: 10.1371/journal.pone.0198611

PubMed Abstract | CrossRef Full Text | Google Scholar

Spray, D. C., and Iacobas, D. A. (2007). Organizational principles of the connexin-related brain transcriptome. J. Membr. Biol. 218, 39–47. doi: 10.1007/s00232-007-9049-5

PubMed Abstract | CrossRef Full Text | Google Scholar

Sreedhar, R., Arumugam, S., Thandavarayan, R. A., Giridharan, V. V., Karuppagounder, V., Pitchaimani, V., et al. (2016). Depletion of cardiac 14-3-3eta protein adversely influences pathologic cardiac remodeling during myocardial infarction after coronary artery ligation in mice. Int. J. Cardiol. 202, 146–153. doi: 10.1016/j.ijcard.2015.08.142

PubMed Abstract | CrossRef Full Text | Google Scholar

Stahl, P., Ruppert, V., Meyer, T., Schmidt, J., Campos, M. A., Gazzinelli, R. T., et al. (2013). Trypomastigotes and amastigotes of Trypanosoma cruzi induce apoptosis and STAT3 activation in cardiomyocytes in vitro. Apoptosis 18, 653–663. doi: 10.1007/s10495-013-0822-x

PubMed Abstract | CrossRef Full Text | Google Scholar

Stahl, P., Ruppert, V., Schwarz, R. T., and Meyer, T. (2014). Trypanosoma cruzi evades the protective role of interferon-gamma-signaling in parasite-infected cells. PLoS ONE 9:e110512. doi: 10.1371/journal.pone.0110512

PubMed Abstract | CrossRef Full Text | Google Scholar

Steyn, P. J., Dzobo, K., Smith, R. I., and Myburgh, K. H. (2019). Interleukin-6 induces myogenic differentiation via JAK2-STAT3 signaling in mouse C2C12 myoblast cell line and primary human myoblasts. Int. J. Mol. Sci. 20:E5273. doi: 10.3390/ijms20215273

PubMed Abstract | CrossRef Full Text | Google Scholar

Sun, L., Ma, K., Wang, H., Xiao, F., Gao, Y., Zhang, W., et al. (2007). JAK1-STAT1-STAT3, a key pathway promoting proliferation and preventing premature differentiation of myoblasts. J. Cell Biol. 179, 129–138. doi: 10.1083/jcb.200703184

PubMed Abstract | CrossRef Full Text | Google Scholar

Tarleton, R. L., Grusby, M. J., and Zhang, L. (2000). Increased susceptibility of Stat4-deficient and enhanced resistance in Stat6-deficient mice to infection with Trypanosoma cruzi. J. Immunol. 165, 1520–1525. doi: 10.4049/jimmunol.165.3.1520

PubMed Abstract | CrossRef Full Text | Google Scholar

Thandavarayan, R. A., Giridharan, V. V., Sari, F. R., Arumugam, S., Veeraveedu, P. T., Pandian, G. N., et al. (2011). Depletion of 14-3-3 protein exacerbates cardiac oxidative stress, inflammation and remodeling process via modulation of MAPK/NF-kB signaling pathways after streptozotocin-induced diabetes mellitus. Cell. Physiol. Biochem. 28, 911–922. doi: 10.1159/000335805

CrossRef Full Text | Google Scholar

WHO (2019). Chagas' Disease (American trypanosomiasis) Factsheet. Available online at: (accessed March 11, 2020).

Google Scholar

Zingales, B. (2018). Trypanosoma cruzi genetic diversity: something new for something known about Chagas disease manifestations, serodiagnosis and drug sensitivity. Acta Trop. 184, 38–52. doi: 10.1016/j.actatropica.2017.09.017

PubMed Abstract | CrossRef Full Text | Google Scholar

Zingales, B., Andrade, S. G., Briones, M. R., Campbell, D. A., Chiari, E., Fernandes, O., et al. (2009). A new consensus for Trypanosoma cruzi intraspecific nomenclature: second revision meeting recommends TcI to TcVI. Mem. Inst. Oswaldo Cruz 104, 1051–1054. doi: 10.1590/S0074-02762009000700021

PubMed Abstract | CrossRef Full Text | Google Scholar

Zingales, B., Miles, M. A., Campbell, D. A., Tibayrenc, M., Macedo, A. M., Teixeira, M. M., et al. (2012). The revised Trypanosoma cruzi subspecific nomenclature: rationale, epidemiological relevance and research applications. Infect. Genet. Evol. 12, 240–253. doi: 10.1016/j.meegid.2011.12.009

PubMed Abstract | CrossRef Full Text | Google Scholar

Zong, C. S., Chan, J., Levy, D. E., Horvath, C., Sadowski, H. B., and Wang, L. H. (2000). Mechanism of STAT3 activation by insulin-like growth factor I receptor. J. Biol. Chem. 275, 15099–15105. doi: 10.1074/jbc.M000089200

PubMed Abstract | CrossRef Full Text | Google Scholar

Keywords: Chagas disease, myoblasts, cell cycle, JAK-STAT pathway, Clcf1, Ywhaq

Citation: Nisimura LM, Coelho LL, Melo TG, Vieira PC, Victorino PH, Garzoni LR, Spray DC, Iacobas DA, Iacobas S, Tanowitz HB and Adesse D (2020) Trypanosoma cruzi Promotes Transcriptomic Remodeling of the JAK/STAT Signaling and Cell Cycle Pathways in Myoblasts. Front. Cell. Infect. Microbiol. 10:255. doi: 10.3389/fcimb.2020.00255

Received: 08 November 2019; Accepted: 30 April 2020;
Published: 17 June 2020.

Edited by:

Nobuko Yoshida, Federal University of São Paulo, Brazil

Reviewed by:

Sergio Schenkman, Federal University of São Paulo, Brazil
Manuel Fresno, Autonomous University of Madrid, Spain

Copyright © 2020 Nisimura, Coelho, de Melo, Vieira, Victorino, Garzoni, Spray, Iacobas, Iacobas, Tanowitz and Adesse. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Daniel Adesse,

In memoriam