Cell Death by Gallotannin Is Associated with Inhibition of the JAK/STAT Pathway in Human Colon Cancer Cells
ABSTRACT: Background: Gallotannin (GT) is a polyphenol that possesses interesting anticancer properties. However, the mechanisms underlying its antitumor effects have not been well defined. Objective: This study was designed to clarify the mechanisms underlying GT antitumor effects in colon cancer...
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Elsevier
2020-01-01
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| Series: | Current Therapeutic Research |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0011393X20300151 |
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| author | Marwa Houssein, PhD Widian Abi Saab, PhD Mahmoud Khalil, PhD Hala Khalife, PhD Maamoun Fatfat, PhD |
| author_facet | Marwa Houssein, PhD Widian Abi Saab, PhD Mahmoud Khalil, PhD Hala Khalife, PhD Maamoun Fatfat, PhD |
| author_sort | Marwa Houssein, PhD |
| collection | DOAJ |
| description | ABSTRACT: Background: Gallotannin (GT) is a polyphenol that possesses interesting anticancer properties. However, the mechanisms underlying its antitumor effects have not been well defined. Objective: This study was designed to clarify the mechanisms underlying GT antitumor effects in colon cancer cell lines. Methods: Three isogenic HCT116 cell lines (p53+/+, p53−/−, and p21−/−) were treated with GT for different time points then Western blot, flow cytometry, and senescence analysis were performed to examine the effect of GT on Mitogen-activated protein kinase (MAPK) and Janus kinase (JAK)/signal transducer and activator of transcription (STAT) effectors, STAT3 downstream apoptotic targets, Sub-G1 phase, and programmed cell death induction. Transfection using Invitrogen Lipofectamine 2000 Transfection Reagent (Thermo Fisher Scientific, Waltham, Massachusetts) were used to identify the role of p53 and p21 in the p53−/− and p21−/− cell lines. Results: Both low and high GT concentrations caused MAPKs activation marked by upregulation of extracellular signal-regulated kinase (p-ERK). The preincubation with the antioxidant Tiron (Sigma-Aldrich, St Louis, Missouri) showed that GT's antitumor effects were not mediated by reactive oxygen species. We then examined the effect of GT on the JAK/STAT pathway, which is known to be activated in colorectal cancer. GT totally inhibited the JAK/STAT pathway effectors JAK2, STAT1, and STAT3 and their downstream apoptotic regulators B-cell lymphoma-extra large (Bcl-xL) and c-Myc in all 3 cell lines. HCT116 cancer cells exhibited differential sensitivity to GT with p21−/− cells being the most sensitive and p53+/+ cells that express p21 protein being the least sensitive. In p53+/+ cells, GT induced senescence, whereas in p53−/− and p21−/− cells, GT induced apoptosis in a caspase independent manner marked by Poly(ADP-Ribose) Polymerase (PARP) cleavage, Bcl-2 downregulation, and upregulation of the Bcl-2 associated X (Bax) to B-cell lymphoma 2 (Bcl-2) ratio. In addition, the sub-G1 phase exceeded 50% in p21−/− cells. Conclusions: Considered together, our results indicate that GT is potent inhibitor of the JAK/STAT pathway in colon cancer irrespective of the p53 and p21 status, which provides insights into its mechanism of anticancer activities and future potential for clinical translation. (Curr Ther Res Clin Exp. 2020; 81:XXX–XXX) |
| first_indexed | 2024-12-10T22:16:52Z |
| format | Article |
| id | doaj.art-ad7bdd872b9949cc8fa5abda4c2e1acb |
| institution | Directory Open Access Journal |
| issn | 0011-393X |
| language | English |
| last_indexed | 2024-12-10T22:16:52Z |
| publishDate | 2020-01-01 |
| publisher | Elsevier |
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| series | Current Therapeutic Research |
| spelling | doaj.art-ad7bdd872b9949cc8fa5abda4c2e1acb2022-12-22T01:31:26ZengElsevierCurrent Therapeutic Research0011-393X2020-01-0192100589Cell Death by Gallotannin Is Associated with Inhibition of the JAK/STAT Pathway in Human Colon Cancer CellsMarwa Houssein, PhD0Widian Abi Saab, PhD1Mahmoud Khalil, PhD2Hala Khalife, PhD3Maamoun Fatfat, PhD4Department of Biological Sciences, Faculty of Science, Beirut Arab University, Beirut, Lebanon; Center for Drug Discovery, American University of Beirut, Beirut, LebanonDepartment of Biology, American University of Beirut, Lebanon; Department of Biology College of Arts and Sciences, Albert Einstein College of Medicine United State, San Diego, California, United StateDepartment of Biological Sciences, Faculty of Science, Beirut Arab University, Beirut, LebanonRammal Laboratory (ATAC), Faculty of Sciences I, Lebanese University Hadath, Beirut, LebanonCenter for Drug Discovery, American University of Beirut, Beirut, Lebanon; Address correspondence to: Mamoun Fatfat, PhD. Center for Drug Discovery, American University of Beirut, Riad El Solh, Beirut, LebanonABSTRACT: Background: Gallotannin (GT) is a polyphenol that possesses interesting anticancer properties. However, the mechanisms underlying its antitumor effects have not been well defined. Objective: This study was designed to clarify the mechanisms underlying GT antitumor effects in colon cancer cell lines. Methods: Three isogenic HCT116 cell lines (p53+/+, p53−/−, and p21−/−) were treated with GT for different time points then Western blot, flow cytometry, and senescence analysis were performed to examine the effect of GT on Mitogen-activated protein kinase (MAPK) and Janus kinase (JAK)/signal transducer and activator of transcription (STAT) effectors, STAT3 downstream apoptotic targets, Sub-G1 phase, and programmed cell death induction. Transfection using Invitrogen Lipofectamine 2000 Transfection Reagent (Thermo Fisher Scientific, Waltham, Massachusetts) were used to identify the role of p53 and p21 in the p53−/− and p21−/− cell lines. Results: Both low and high GT concentrations caused MAPKs activation marked by upregulation of extracellular signal-regulated kinase (p-ERK). The preincubation with the antioxidant Tiron (Sigma-Aldrich, St Louis, Missouri) showed that GT's antitumor effects were not mediated by reactive oxygen species. We then examined the effect of GT on the JAK/STAT pathway, which is known to be activated in colorectal cancer. GT totally inhibited the JAK/STAT pathway effectors JAK2, STAT1, and STAT3 and their downstream apoptotic regulators B-cell lymphoma-extra large (Bcl-xL) and c-Myc in all 3 cell lines. HCT116 cancer cells exhibited differential sensitivity to GT with p21−/− cells being the most sensitive and p53+/+ cells that express p21 protein being the least sensitive. In p53+/+ cells, GT induced senescence, whereas in p53−/− and p21−/− cells, GT induced apoptosis in a caspase independent manner marked by Poly(ADP-Ribose) Polymerase (PARP) cleavage, Bcl-2 downregulation, and upregulation of the Bcl-2 associated X (Bax) to B-cell lymphoma 2 (Bcl-2) ratio. In addition, the sub-G1 phase exceeded 50% in p21−/− cells. Conclusions: Considered together, our results indicate that GT is potent inhibitor of the JAK/STAT pathway in colon cancer irrespective of the p53 and p21 status, which provides insights into its mechanism of anticancer activities and future potential for clinical translation. (Curr Ther Res Clin Exp. 2020; 81:XXX–XXX)http://www.sciencedirect.com/science/article/pii/S0011393X20300151Apoptosiscaspasecolon cancergallotanninJAK/STATsenescence |
| spellingShingle | Marwa Houssein, PhD Widian Abi Saab, PhD Mahmoud Khalil, PhD Hala Khalife, PhD Maamoun Fatfat, PhD Cell Death by Gallotannin Is Associated with Inhibition of the JAK/STAT Pathway in Human Colon Cancer Cells Current Therapeutic Research Apoptosis caspase colon cancer gallotannin JAK/STAT senescence |
| title | Cell Death by Gallotannin Is Associated with Inhibition of the JAK/STAT Pathway in Human Colon Cancer Cells |
| title_full | Cell Death by Gallotannin Is Associated with Inhibition of the JAK/STAT Pathway in Human Colon Cancer Cells |
| title_fullStr | Cell Death by Gallotannin Is Associated with Inhibition of the JAK/STAT Pathway in Human Colon Cancer Cells |
| title_full_unstemmed | Cell Death by Gallotannin Is Associated with Inhibition of the JAK/STAT Pathway in Human Colon Cancer Cells |
| title_short | Cell Death by Gallotannin Is Associated with Inhibition of the JAK/STAT Pathway in Human Colon Cancer Cells |
| title_sort | cell death by gallotannin is associated with inhibition of the jak stat pathway in human colon cancer cells |
| topic | Apoptosis caspase colon cancer gallotannin JAK/STAT senescence |
| url | http://www.sciencedirect.com/science/article/pii/S0011393X20300151 |
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