OPINION article

Front. Cell. Infect. Microbiol., 26 October 2023

Sec. Parasite and Host

Volume 13 - 2023 | https://doi.org/10.3389/fcimb.2023.1287492

The biotechnological potential of proteases from hematophagous arthropod vectors

  • 1. Host-Pathogen Interface Laboratory, Department of Cell Biology, Institute of Biology, University of Brasília, Brasília, DF, Brazil

  • 2. Faculty of Ceilândia, University of Brasília, Brasília, DF, Brazil

1 Introduction

Vector-borne diseases contribute to over 17% of total infectious diseases (). Mosquitoes, ticks, fleas, sand flies and triatomines are hematophagous arthropod vectors of debilitating pathogenic microorganisms that cause widespread human infectious diseases, such as malaria, zika, dengue fever, yellow fever, Japanese encephalitis, tick-borne encephalitis, Lyme disease, plague, rickettsiosis, leishmaniasis and Chagas disease (). Scientists worldwide have been making significant contributions to the field of parasitic infections transmitted by arthropod vectors investigating their molecular biology. Arthropod proteases play essential roles in their blood-feeding behavior, egg development, and immunity (). Proteases are multifunctional enzymes that hydrolyze one or more peptide bonds in a protein or peptide. Their activity can result in modification/activation/inactivation of proteins, enzymes and peptides, protein targeting, and amino acids recycling (). Due to their inherent involvement in many key physiological processes, inhibition or abnormal enzyme production or secretion can lead to various pathological conditions ().

Otherwise, the remarkable substrate affinity and specificity of proteases are features that make enzyme therapy an important approach for treating/managing multiple ailments (). In fact, the accumulated knowledge on the catalytic and functional diversity of proteases has driven the development of therapeutic approaches for cardiovascular disease, inflammation, sepsis, digestive and retinal disorders, among others (), and also their incorporation into dermatological products (). Several protease therapies have been approved by the U.S. Food and Drug Administration, and many are in clinical development (; ; ; ; ; ; ; ; ; ).

Our previous review covered contemporary advances in the proteases from hematophagous arthropod vectors up to 2016 (). In this opinion article, we summarize further research findings on vector proteases and emphasize their biotechnological potential for the development of innovative protease-based drugs with broad clinical applications. This potential arises from the considerable effort that has been made by high-throughput transcriptomic and proteomic approaches to catalog arthropod vector proteins, followed by structural biology and protease activity investigations.

2 Finding the molecule and its biological activity

The progress in biotechnology and the application of high-throughput sequencing technologies have unveiled a remarkable number of proteases in hematophagous arthropod vector tissues, giving rise to an emerging field of scientific exploration. Hematophagous consume blood from vertebrate hosts as a nutrient source. Their ability to locate the prey, their behavior, their mouthparts morphology, and their physiology are an interesting combination of tools very well adapted to obtain blood meals. Once the host is found at the right place and time, the hematophagous pursue their meal boldly. During the bite, the host suffers tissue and vascular injuries, which trigger a series of interrelated mechanisms, such as hemostasis, inflammation, and immune responses (; ). Large-scale sialotranscriptomic (salivary glands transcriptome) and sialoproteomic (salivary glands proteome) analyses have been reported for various blood-feeding arthropods (; ; ; ; ; ; ; ; ; ; ) disclosing the saliva of hematophagous is indeed a potent pharmacologically active fluid capable of counteracting the hemostatic, inflammatory, and immune responses of the vertebrate host (; ). The comprehensive mapping of already reported sialomes (salivary glands transcriptomic and proteomic analyses) revealed different protease families are produced by salivary glands cells (; ; ; ; ; ; ; ; ; ; ).

Metalloprotease and serine protease sequences have been disclosed in the salivary glands of ticks (; ; ) and triatomines (; ), and their functions are under investigation. Metalloprotease members are known to inhibit platelet aggregation and hydrolyze fibrinogen and fibronectin preventing blood clotting (; ; ; ; ; ). Interestingly, metalloproteases are abundant in snake venoms showing important antithrombotic and hemorrhagic activities (; ). In agreement, functional studies of Metis 1 and Metis 2, two metalloproteases found in the salivary glands of Ixodes ricinus ticks, have shown that these proteins play a significant role in regulating fibrinolysis (). Although the exact role of these components in saliva remains unknown, it is important to explore their potential in producing peptides that can specifically target inflammation and coagulation cascades (). This could lead to the development of more effective and precise protease-based drugs, which could be used to treat hemorrhagic and thrombotic disorders, as well as cardiovascular and cerebrovascular diseases by preventing thrombus formation.

During the digestion process of blood components in the gut of hematophagous organisms, proteases function within a network of multiple enzymes that break down hemoglobin. These multi-peptidase repertoires are mainly composed of serine proteases in mosquitoes and cysteine and aspartic proteases in ticks and triatomines (). Trypanosoma cruzi, the causative agent of Chagas disease, proliferates and develops inside the intestines of triatomine vectors. As part of the feeding process, while consuming blood, the vector releases T. cruzi contaminated feces onto the skin of the vertebrate host. The protozoan can infect the host through the bite injury or intact mucosae. In this context, it has been suggested that T. cruzi can modulate insect metabolism, increasing the activity levels of digestive enzymes (; ). The investigation of protease activity in Rhodnius prolixus triatomine unveiled distinct sequential patterns of protease expression within the insect digestive system, including cathepsin L-like and cathepsin D-like proteases (Table 1) (). It is important to conduct comprehensive studies to better understand the role of proteases in the trypanosome/vector interaction. We must consider whether T. cruzi modulation of digestive enzymes could enhance the infection process in humans. From this knowledge, strategies for direct intervention in the vector gut physiology or the modulation of interactions between the pathogen and digestive enzymes may be developed. This hypothesis is an attractive area of research, as the digestive enzymes produced by triatomines could potentially be used as a parasite control intervention strategy.

Table 1

FamilyProteaseVectorLocalizationRoleRef
SerineTrypsin-like
(Triapsin)
Triatoma infestansSalivary glandsVasodilation()
Trypsin-like
(Is- coding sequences)
Ixodes scapularisGutDigestion()
Trypsin
(T714)
Aedes aegyptiGutImmunity()
Chymotrypsins
(Ag-coding sequences)
Anopheles gambiaeFemale reproductive tractsMating()
Chymotrypsins
(MatRAP1)
Anopheles gambiaeFemale reproductive tractsMating()
Chymotrypsins
(AaCT-1)
Aedes aegyptiHemolymphImmunity()
CysteineCathepsin L
(Rp-activity)
Rhodnius prolixusGutDigestion()
cathepsin L-like
(AaCatL)
Aedes aegyptiSalivary glands, GutImmunity()
Cathepsin B
(Hl- coding sequences)
Haemaphysalis longicornisEggsVitellin degradation()
AsparticCathepsin D
(Rp-activity)
Rhodnius prolixusGutDigestion()
Cathepsin D
(Hl- coding sequences)
Haemaphysalis longicornisEggsVitellin degradation()

Novel information on members from the serine, cysteine and aspartic protease families disclosed in triatomine, tick and mosquito tissues from 2017 to 2023.

Yet concerning triatomine proteases, triapsin (Table 1), a serine protease from the saliva of Triatoma infestans first described in 2001 () and still under investigation, is capable of inducing hydrolysis of protease-activated receptors (PARs), with a distinct preference for cleaving the PAR-2 peptide. Mass spectrometry analysis has corroborated the presence of a single cleavage site, corresponding to the activation site of the PAR-2 receptor. Moreover, nitric oxid (NO) levels measurements have demonstrated that triapsin induces a dose-dependent release of NO in cultured human umbilical vein endothelial cells. NO appears to play a role in the vasorelaxant activity of triapsin. Furthermore, observations of increased mouse ear venular diameter following triapsin exposure suggest a plausible link between triapsin activity mediated by PAR-2 and vasodilation induced by T. infestans saliva (Table 1) ().

While consuming blood, ticks are capable of transmitting viral and bacterial diseases, such as tick-borne encephalitis caused by the tick-borne encephalitis virus, and Lyme disease caused by Borrelia burgdorferi spirochetes (). Ticks have a digestive system that consists of a combination of cysteine-aspartic proteases, which operate together in hemoglobinolysis (). Previous studies have highlighted the significance of IrCD 1-3, which are three different isoforms of cathepsin, in playing various biological roles in Ixodes ricinus tick. These enzymes are expressed not only in gut cells but also in salivary glands and ovaries, and may generate antimicrobial peptides, that aid in immune responses against foreign invaders (; ). Of interest, in ticks, trypsin-like serine proteases may participate in the liberation of dipeptides and free amino acids in the intracellular midgut vesicles and outside the digestive vesicles (). In Ixodes scapularis, vector of Lyme disease, trypsin levels increase significantly after repletion. Knockdown of tick serine proteases was shown to lower hemoglobin degradation and negatively impacted levels of active trypsin in the midgut of I. scapularis, as well as blood feeding, survival, and fecundity in this species (Table 1) (). Another potential candidate for investigation is the vitellin degrading cysteine endopeptidase (VTDCE), found in Boophilus microplus tick eggs. This enzyme plays a role in both vitellogenesis and embryonic development (). VTDCE also possesses antimicrobial activity, particularly reported against Staphylococcus epidermidis (). Proteases like IrCD and VTDCE hold significant biotechnological potential as therapeutic agents for pathogen control. More recently, it was also shown that vitellin degradation in Haemaphysalis longicornis eggs involves three enzymes: cathepsin B, cathepsin D, and acid phosphatase (Table 1) ().

In mosquitoes, it was demonstrated that the reproductive success of Anopheles gambiae, an important vector of the malaria parasite Plasmodium spp, relies on a single copulation event after which most females become permanently refractory to further mating. In females, two chymotrypsin‐like serine proteases regulated by the male‐synthetized steroid hormone 20‐hydroxyecdysone (20E) play an important role in modulating their susceptibility to mating. The depletion of the Mating Regulated Atrial Protease 1 (MatRAP1), one of these proteases, by RNA interference, reduced female refractoriness to further copulation, allowing a significant proportion of females mate again (Table 1) (). In Aedes aegypti, a cathepsin L-like peptidase (AaCatL) was cloned, expressed, purified, and biochemically characterized. Transcripts of AaCatL were detected in the salivary glands and midgut from Ae. aegypti and seem to be negatively correlated with DENV-2 virus titers, indicating AaCatL may have a role during mosquito-DENV interactions. Purified recombinant AaCatL has a typical cathepsin L-like substrate profile. Authors suggest AaCatL may inhibit the activation of caspases (Table 1) (). In field-caught Ae. aegypti, the gut-associated fungus Talaromyces was shown to profoundly down-regulate digestive enzyme genes and trypsin activity in the mosquito and to render Ae. aegypti more permissive to DENV infection (Table 1) (). Interestingly, it was reported that the expression of some chymotrypsins from Ae. aegypti and Aedes albopictus, such as AaCT-1 (Table 1) are suppressed by the human blood-derived microRNA hsa-miR- 150-5p, enhancing DENV and ZIKV loads in these mosquitoes (Table 1) ().

Table 1 presents novel information on eleven members from the serine, cysteine and aspartic protease families disclosed in triatomine, tick and mosquito tissues, from 2017 to 2023. For a list of proteases from hematophagous arthropod vectors disclosed before this period, we suggest the information that was written in our previous publication ().

3 Maxadilan, the vasodilator from sand flies

Turning to the clinical applications of proteins from hematophagous arthropod vectors, although not a protease, a potent vasodilator peptide, named maxadilan, from the salivary glands of Lutzomyia longipalpis, the sand fly that transmits Leishmania spp., selectively and potently activate the PAC1 receptor (), following intradermal injection (). This receptor is activated in the pathophysiology of migraine. Maxadilan was proposed to be used as a novel pharmacodynamic biomarker for the early clinical development of PAC1 receptor antagonists (), highlighting the potential clinical use of proteins from hematophagous arthropod vectors.

4 The ongoing challenge

Developing new therapies for infectious diseases transmitted by arthropod vectors, as well as for controlling disorders that affect platelet function and blood clotting is a considerable challenge. Understanding the functional role of proteins is a significant task of the post-genome research era. The journey from discovering a promising compound to progressing to human clinical trials and reaching the market spans many years and entails substantial financial investments. However, these paths begin with fundamental science. In this opinion article, we wanted to emphasize the biotechnological potential of hematophagous vector proteases. Realizing this potential requires a deeper research interest in this area and a commitment to developing effective methodologies for structural and functional studies.

Statements

Author contributions

CA: Conceptualization, Project administration, Writing – review & editing. PS: Conceptualization, Project administration, Writing – review & editing. GC: Writing – original draft. GS: Writing – original draft. RM: Writing – original draft. IB: Writing – review & editing. JS: Writing – review & editing.

Funding

The author(s) declare financial support was received for the research, authorship, and/or publication of this article. This work was supported by grants awarded by the Fundação de Apoio à Pesquisa do Distrito Federal (FAP-DF, grants 00193-00000825/2021-19 and 00193-00002600/2022-70), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES, grant 88881.711954/2022-0 CAPES-COFECUB), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, INCT-MCTI/CNPq/CAPES/FAPs 16/2014), Financiadora de Estudos e Projetos (Finep, grant CT-Infra 0439/11).

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.

Publisher’s note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

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Summary

Keywords

protease, arthropod vector, hematophagous vector, biothechnological potential, protease-based therapy

Citation

de Araújo CN, Santiago PB, Causin Vieira G, Silva GS, Moura RP, Bastos IMD and Santana JM (2023) The biotechnological potential of proteases from hematophagous arthropod vectors. Front. Cell. Infect. Microbiol. 13:1287492. doi: 10.3389/fcimb.2023.1287492

Received

01 September 2023

Accepted

09 October 2023

Published

26 October 2023

Volume

13 - 2023

Edited by

Martina Paoletta, Instituto Nacional de Tecnología Agropecuaria, Argentina

Reviewed by

Isaura Simões, University of Coimbra, Portugal

Updates

Copyright

*Correspondence: Paula Beatriz Santiago,

Disclaimer

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.

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