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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

BthTX-I from Bothrops jararacussu induces apoptosis in human breast cancer cell lines and decreases cancer stem cell subpopulation

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Author(s):
Alves Bezerra, Patricia Heloise [1] ; Ferreira, Isadora Marques [1] ; Franceschi, Beatriz Tinoco [1] ; Bianchini, Francine [1] ; Ambrosio, Luciana [2] ; Cintra, Adelia Cristina O. [3] ; Sampaio, Suely Vilela [3] ; de Castro, Fabiola Attie [2] ; Torqueti, Maria Regina [1]
Total Authors: 9
Affiliation:
[1] Univ Sao Paulo, Sch Pharmaceut Sci Ribeirao Preto, Dept Clin Anal Toxicol & Food Sci, Lab Clin Cytol, Ribeirao Preto, SP - Brazil
[2] Univ Sao Paulo, Sch Pharmaceut Sci Ribeirao Preto, Dept Clin Anal Toxicol & Food Sci, Lab Hematol, Ribeirao Preto, SP - Brazil
[3] Univ Sao Paulo, Sch Pharmaceut Sci Ribeirao Preto, Dept Clin Anal Toxicol & Food Sci, Lab Toxinol, Ribeirao Preto, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Journal of Venomous Animals and Toxins including Tropical Diseases; v. 25, JUL 29 2019.
Web of Science Citations: 0
Abstract

Background: Breast cancer is the neoplasm with both the highest incidence and mortality rate among women worldwide. Given the known snake venom cytotoxicity towards several tumor types, we evaluated the effects of BthTX-I from Bothrops jararacussu on MCF7, SKBR3, and MDAMB231 breast cancer cell lines. Methods: BthTX-I cytotoxicity was determined via MTT {[}3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-tetrazoliumbromide] assay. Cell death was measured by a hypotonic fluorescent solution method, annexin-V-FITC/propidium iodide staining and by apoptotic/autophagic protein expression. Cancer stem cells (CSCs) were quantified by flow cytometry using anti-CD24-FITC and anti-CD44-APC antibodies and propidium iodide. Results: BthTX-I at 102 mu g/mL induced cell death in all cell lines. The toxin induced apoptosis in MCF7, SKBR3, and MDAMB231 in a dose-dependent manner, as confirmed by the increasing number of hypodiploid nuclei. Expression of pro-caspase 3, pro-caspase 8 and Beclin-1 proteins were increased, while the level of the antiapoptotic protein Bcl-2 was diminished in MCF7 cells. BthTX-I changed the staining pattern of CSCs in MDAMB231 cells by increasing expression of CD24 receptors, which mediated cell death. Conclusions: BthTX-I induces apoptosis and autophagy in all breast cancer cell lines tested and also reduces CSCs subpopulation, which makes it a promising therapeutic alternative for breast cancer. (AU)

FAPESP's process: 11/23236-4 - Native and recombinant animal toxins: functional, structural and molecular analysis
Grantee:Suely Vilela
Support Opportunities: Research Projects - Thematic Grants