1 Introduction
With a discerning and inquisitive interest, we read the paper “Triclabendazole Induces Pyroptosis by Activating Caspase-3 to Cleave GSDME in Breast Cancer Cells” published in Frontiers in Pharmacology (Yan et al., 2021). In this study, Yan et al. present compelling evidence for the pivotal role of triclabendazole in breast cancer cells. Their findings suggest that triclabendazole induces GSDME-dependent pyroptosis through caspase-3 activation, at least partly by enhancing the ROS/JNK/Bax-mitochondrial apoptotic pathway, thereby offering valuable insights into the potential new application of this existing drug in breast cancer treatment. In general, this is an excellent piece of research. However, there are a few points in the paper that require further discussion and critical examination.
2 Results and discussion
GSDME expression levels vary in different cell types and tissues. High levels of GSDME lead to pyroptosis while cells with low levels undergo apoptosis upon chemotherapy treatment (Zhang et al., 2019). GSDME has a caspase-3 cleavable site (267DMPD270), first discovered in cancer cell lines with strong expression of GSDME (Wang et al., 2017; Jiang et al., 2020). If the chemotherapeutic treatment is a caspase-3 activator, it may trigger caspase-3 to cleave GSDME as an alternative to PARP. This mechanism produces GSDME-NT, which may afterwards trigger pyroptotic necrosis in apoptotic cells and release immunogenic effectors by acting on the plasma membrane (Tong et al., 2022). Several chemotherapy medicines have been demonstrated to become ineffective if GSDME is lost. The DNA methyltransferase inhibitor decitabine has been shown in studies to boost the expression of GSDME and induce pyroptosis in cancer tissues with low expression of GSDME by blocking hypermethylation of the gene’s promoter. Therefore, GSDME can be considered to act as a pivotal protein in the process of switching between apoptosis and pyroptosis.
In Yan’s report, the human breast cancer cell line MCF-7 was utilized for in vitro experimental analysis. The authors reported that triclabendazole significantly induced the activation of caspase-3, which resulted in an increase in the levels of GSDME-NT in MCF-7 cells (Figure 1). However, it is widely acknowledged that the MCF-7 cells lack the expression of both caspase-3 and GSDME (Tian, 2023). The lack of caspase-3 in MCF-7 cells is caused by a 47-base pair deletion within exon 3 of the CASP3 gene resulting in the skipping of this exon during pre-mRNA splicing and introduction of a premature stop codon at position 42 that completely abrogates translation of the CASP3 mRNA. Furthermore, GSDME expression is silenced through promoter hypermethylation, which contributes to the absence of this protein in MCF-7 cells (Janicke et al., 1998b; Friedrich et al., 2001; Ferguson et al., 2003; Tian, 2023). Therefore, the detection of cleaved caspase-3 and GSDME-NT proteins expression in caspase-3/GSDME deficient MCF-7 cells in the present study made us confused. A further apparent problem is that in the section of MATERIALS and METHODS, the primary antibody anti-GSDME-N-terminal (#ab215191), used in the Western blot experiment, is produced by the Abcam company. As illustrated in Figure 2A, the image from the Abcam website depicts a Western blot analysis of extracts from SH-SY5Y and MCF-7 cells utilising GSDME-N-terminal antibody (#ab215191). According to the instructions, anti-GSDME-N-terminal antibody (#ab215191) has explicitly stated that GSDME protein in MCF-7 cells cannot be detected (server as a negative control). Notably, Western blot images provided by Cell Signaling Technology company for the Caspase-3 (D3R6Y) Rabbit mAb (#14220) show that MCF-7 cells are negative for caspase-3 expression (Figure 2B). The central question that needs to be addressed is how cleaved caspase-3 can be detected in the absence of caspase-3 protein expression in MCF-7 cells. Moreover, MCF-7 cells do not express the GSDME protein, thereby precluding the possibility of activated caspase-3 cleaving GSDME. Moreover, caspase-3 plays a crucial role in apoptosis. Although caspase-3-deficient MCF-7 cells are still sensitive to cell death induction by several stimuli including TNF-α, staurosporine and various DNA damaging agents (Janicke et al., 1998a; Janicke et al., 1998b; Janicke et al., 2001). The distinctive morphological characteristics of apoptotic cells, including shrinkage and blebbing, are not evident in caspase-3-deficient MCF-7 cells. It has been demonstrated that exogenous expression of caspase-3 in the MCF-7 cell line can restore the apoptotic characteristics of these cells when stimulated by apoptosis inducers (Janicke et al., 1998b; Yang et al., 2001; Wang et al., 2016).
FIGURE 1
FIGURE 2
This discrepancy may be partially attributed to sample contamination and the use of incorrect reagents that cross-react with proteins unrelated to caspase-3 and GSDME in cellular extracts. Another possibility is that the cultures examined may not contain the original MCF-7 cell line, potentially due to contamination with other cell types during the process of culturing and passaging. The authors may need to confirm the identity of the MCF-7 cell line using short tandem repeat (STR) analysis or other appropriate methods. They should also replicate the experiments using a cell line that naturally expresses caspase-3 and GSDME, such as HCT116 or A549, to confirm the proposed mechanism (Yu et al., 2019; Zhang et al., 2019). Additionally, a more reliable approach would be to introduce exogenous expression of caspase-3 and GSDME in MCF-7 cells or use demethylating agents like decitabine to restore GSDME expression.
3 Conclusion
In conclusion, Yan et al. have made a valuable contribution to our understanding of the anti-cancer effects of triclabendazole. This work paves the way for new avenues of research and potential treatment strategies in cancer therapy. Although the methodology and results of the study are praiseworthy, there is a need to reinforce the conclusions. Addressing the discrepancy regarding the detection of GSDME-FL, GSDME-NT, and cleaved caspase-3 in the MCF-7 cell line, which is known to lack GSDME and caspase-3 expression, would enhance the reliability of the in vitro findings. Furthermore, the validation of pivotal outcomes through the utilisation of exogenous expression of caspase-3 and GSDME, or through the employment of decitabine to induce GSDME expression, may provide more conclusive evidence regarding the impact of triclabendazole on pyroptosis.
Statements
Author contributions
JG: Conceptualization, Funding acquisition, Writing – review and editing. W-LP: Writing – original draft. C-GL: Conceptualization, Funding acquisition, Writing – original draft, Writing – review and editing. Y-LW: Conceptualization, Funding acquisition, Writing – original draft, Writing – review and editing.
Funding
The author(s) declare that financial support was received for the research and/or publication of this article. This work was supported by grants from the National Natural Science Foundation of China (no.82404670), GuangDong Basic and Applied Basic Research Foundation (no. 2023A1515110466), Shenzhen Nanshan District Health System Science and Technology Major Project Outstanding Youth Fund (no. NSZD2024035), and Shenzhen Science and Technology R&D Fund Basic Research Project (no. JCYJ20230807115813028, no. JCYJ20220530150407015, no. JCYJ20240813140505007).
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.
Generative AI statement
The author(s) declare that no Generative AI was used in the creation of this manuscript.
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.
References
1
FergusonH. A.MariettaP. M.Van Den BergC. L. (2003). UV-induced apoptosis is mediated independent of caspase-9 in MCF-7 cells: a model for cytochrome c resistance. J. Biol. Chem.278 (46), 45793–45800. 10.1074/jbc.M307979200
2
FriedrichK.WiederT.Von HaefenC.RadetzkiS.JanickeR.Schulze-OsthoffK.et al (2001). Overexpression of caspase-3 restores sensitivity for drug-induced apoptosis in breast cancer cell lines with acquired drug resistance. Oncogene20 (22), 2749–2760. 10.1038/sj.onc.1204342
3
JanickeR. U.EngelsI. H.DunkernT.KainaB.Schulze-OsthoffK.PorterA. G. (2001). Ionizing radiation but not anticancer drugs causes cell cycle arrest and failure to activate the mitochondrial death pathway in MCF-7 breast carcinoma cells. Oncogene20 (36), 5043–5053. 10.1038/sj.onc.1204659
4
JanickeR. U.NgP.SprengartM. L.PorterA. G. (1998a). Caspase-3 is required for alpha-fodrin cleavage but dispensable for cleavage of other death substrates in apoptosis. J. Biol. Chem.273 (25), 15540–15545. 10.1074/jbc.273.25.15540
5
JanickeR. U.SprengartM. L.WatiM. R.PorterA. G. (1998b). Caspase-3 is required for DNA fragmentation and morphological changes associated with apoptosis. J. Biol. Chem.273 (16), 9357–9360. 10.1074/jbc.273.16.9357
6
JiangM.QiL.LiL.LiY. (2020). The caspase-3/GSDME signal pathway as a switch between apoptosis and pyroptosis in cancer. Cell Death Discov.6, 112. 10.1038/s41420-020-00349-0
7
TianT. (2023). MCF-7 cells lack the expression of Caspase-3. Int. J. Biol. Macromol.231, 123310. 10.1016/j.ijbiomac.2023.123310
8
TongX.TangR.XiaoM.XuJ.WangW.ZhangB.et al (2022). Targeting cell death pathways for cancer therapy: recent developments in necroptosis, pyroptosis, ferroptosis, and cuproptosis research. J. Hematol. Oncol.15 (1), 174. 10.1186/s13045-022-01392-3
9
WangS.HeM.LiL.LiangZ.ZouZ.TaoA. (2016). Cell-in-Cell death is not restricted by caspase-3 deficiency in MCF-7 cells. J. Breast Cancer19 (3), 231–241. 10.4048/jbc.2016.19.3.231
10
WangY.GaoW.ShiX.DingJ.LiuW.HeH.et al (2017). Chemotherapy drugs induce pyroptosis through caspase-3 cleavage of a gasdermin. Nature547 (7661), 99–103. 10.1038/nature22393
11
YanL.LiuY.MaX. F.HouD.ZhangY. H.SunY.et al (2021). Triclabendazole induces pyroptosis by activating caspase-3 to cleave GSDME in breast cancer cells. Front. Pharmacol.12, 670081. 10.3389/fphar.2021.670081
12
YangX. H.SladekT. L.LiuX.ButlerB. R.FroelichC. J.ThorA. D. (2001). Reconstitution of caspase 3 sensitizes MCF-7 breast cancer cells to doxorubicin- and etoposide-induced apoptosis. Cancer Res.61 (1), 348–354.
13
YuJ.LiS.QiJ.ChenZ.WuY.GuoJ.et al (2019). Cleavage of GSDME by caspase-3 determines lobaplatin-induced pyroptosis in colon cancer cells. Cell Death Dis.10 (3), 193. 10.1038/s41419-019-1441-4
14
ZhangC. C.LiC. G.WangY. F.XuL. H.HeX. H.ZengQ. Z.et al (2019). Chemotherapeutic paclitaxel and cisplatin differentially induce pyroptosis in A549 lung cancer cells via caspase-3/GSDME activation. Apoptosis24 (3-4), 312–325. 10.1007/s10495-019-01515-1
Summary
Keywords
MCF-7 cells, gasdermin E, caspase-3, pyroptosis, breast cancer
Citation
Guo J, Peng W-L, Li C-G and Wang Y-L (2025) Commentary: Triclabendazole induces pyroptosis by activating caspase-3 to cleave GSDME in breast cancer cells. Front. Pharmacol. 16:1583920. doi: 10.3389/fphar.2025.1583920
Received
28 February 2025
Accepted
18 April 2025
Published
30 April 2025
Volume
16 - 2025
Edited by
Shuo Chen, Northeastern University, China
Reviewed by
Happy Kurnia Permatasari, University of Brawijaya, Indonesia
Updates
Copyright
© 2025 Guo, Peng, Li and Wang.
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*Correspondence: Chen-Guang Li, 337916507@qq.com; Yu-Long Wang, ylwang668@163.com
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.