The anti-cancer potential of crotoxin in estrogen receptor-positive breast cancer: Its effects and mechanism of action.
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| Abstract |
Estrogen receptor-positive (ER+) breast cancer is the most diagnosed subtype of breast cancer. Currently, aromatase inhibitors (AIs) are used as first-line treatment option in this type of tumors, however they cause several side effects, which is why new therapeutic approaches are demanding. The South American rattlesnake Crotalus durissus terrificus produces a venom enriched in several bioactive substances, like phospholipases A2 (PLA2). One of those is crotoxin, a β-neurotoxin, that has already been reported for its anti-cancer properties in different cancers. Recently, its clinical interest has emerged and, in fact, a clinical trial in patients with advanced cancer is underway. Considering this, in this work, we studied the biological mechanisms behind the anti-cancer effects of crotoxin B (CTX) in an ER+ aromatase-overexpressing breast cancer cell line (MCF-7aro cells). Results revealed that CTX impairs MCF-7aro cells growth, through a cell cycle arrest at G2/M phase, inhibition of ERK1/2 pathway and by apoptosis through activation of caspase-8. In addition, it can be considered a safe natural compound as did not affect non-cancerous cells and only showed anti-growth effects in breast cancer cells. Therefore, this study represents an important landmark to better understand the effects and mechanisms of action of crotoxin in ER+ breast cancer.
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| Authors | Cristina Ferreira Almeida, Cristina Amaral, Tiago V Augusto, Georgina Correia-da-Silva, Camila Marques de Andrade, Maria Regina Torqueti, Natércia Teixeira |
| Journal | Toxicon : official journal of the International Society on Toxinology (Toxicon) Vol. 200 Pg. 69-77 (Sep 2021) ISSN: 1879-3150 [Electronic] England |
| PMID | 34265323 (Publication Type: Journal Article) |
| Copyright | Copyright © 2021 Elsevier Ltd. All rights reserved. |
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