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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.)

Palladacycle (BPC) antitumour activity against resistant and metastatic cell lines: The relationship with cytosolic calcium mobilisation and cathepsin B activity

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Bechara, Alexandre [1] ; Barbosa, Christiano M. V. [2] ; Paredes-Gamero, Edgar J. [2] ; Garcia, Daniel M. [1] ; Silva, Luis S. [3] ; Matsuo, Alisson L. [3] ; Nascimento, Fabio D. [4] ; Rodrigues, Elaine G. [3] ; Caires, Antonio C. F. [5] ; Smaili, Soraya S. [1] ; Bincoletto, Claudia [1]
Total Authors: 11
Affiliation:
[1] Univ Fed Sao Paulo, UNIFESP, Dept Farmacol, EPM, Sao Paulo - Brazil
[2] Univ Fed Sao Paulo, UNIFESP, Dept Biofis, EPM, Sao Paulo - Brazil
[3] Univ Fed Sao Paulo, UNIFESP, Unidade Oncol Expt, EPM, Sao Paulo - Brazil
[4] Univ Bandeirante Sao Paulo UNIBAN, Sao Paulo - Brazil
[5] Univ Mogi das Cruzes, Ctr Interdisciplinar Invest Bioquim, Mogi Das Cruzes, SP - Brazil
Total Affiliations: 5
Document type: Journal article
Source: EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY; v. 79, p. 24-33, MAY 22 2014.
Web of Science Citations: 14
Abstract

The search for new compounds that induce p53-independent apoptosis is the focus of many studies in cancer biology because these compounds could be more specific and would overcome chemotherapy resistance. In this study, we evaluated the in vitro antitumour activity of a Biphosphinic Palladacycle Complex (BPC) and extended preclinical studies to an in vivo model. Saos-2 cells, a p53-null human osteosarcoma drug-resistant cell line, were treated with BPC in the presence or absence of a cathepsin B inhibitor and a calcium chelator (CA074 and BAPTA-AM, respectively), and several parameters related to apoptosis were evaluated. Preclinical studies were performed with mice that were intravenously inoculated with murine melanoma Bl6F10-Nex2 cells and treated intraperitoneally (i.p.) with BPC (8 mg/kg/ day) for ten consecutive days, when lung metastatic nodules were counted. In vitro data show that BPC induces cell death in Saos-2 cells mainly by apoptosis, which was accompanied by the effector caspase-3 activation. These events are most likely related to Bax translocation and increased cytosolic calcium mobilisation, mainly from intracellular compartments. Lysosomal Membrane Permeabilisation (LMP) was also observed after 12 h of BPC exposure. Interestingly, BAPTA-AM and CA074 significantly decreased BPC cytotoxicity, suggesting that both calcium and cathepsin B are required for BPC antitumour activity. In vivo studies demonstrated that BPC protects mice against murine metastatic melanoma. In conclusion, BPC complex is an effective anticancer compound against metastatic murine melanoma. This complex is cytotoxic to the drug-resistant osteosarcoma Saos-2 human tumour cells by inducing apoptosis triggered by calcium signalling and a lysosomal-dependent pathway. (C) 2014 Elsevier Masson SAS. All rights reserved. (AU)