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Levy D, de Melo TC, Oliveira BA, Paz JL, de Freitas FA, Reichert CO, Rodrigues A, Bydlowski SP. 7-Ketocholesterol and cholestane-triol increase expression of SMO and LXRα signaling pathways in a human breast cancer cell line. Biochem Biophys Rep 2018; 19:100604. [PMID: 31463370 PMCID: PMC6709374 DOI: 10.1016/j.bbrep.2018.12.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Revised: 12/14/2018] [Accepted: 12/20/2018] [Indexed: 02/07/2023] Open
Abstract
Oxysterols are 27-carbon oxidation products of cholesterol metabolism. Oxysterols possess several biological actions, including the promotion of cell death. Here, we examined the ability of 7-ketocholesterol (7-KC), cholestane-3β-5α-6β-triol (triol), and a mixture of 5α-cholestane-3β,6β-diol and 5α-cholestane-3β,6α-diol (diol) to promote cell death in a human breast cancer cell line (MDA-MB-231). We determined cell viability, after 24-h incubation with oxysterols. These oxysterols promoted apoptosis. At least part of the observed effects promoted by 7-KC and triol arose from an increase in the expression of the sonic hedgehog pathway mediator, smoothened. However, this increased expression was apparently independent of sonic hedgehog expression, which did not change. Moreover, these oxysterols led to increased expression of LXRα, which is involved in cellular cholesterol efflux, and the ATP-binding cassette transporters, ABCA1 and ABCG1. Diols did not affect these pathways. These results suggested that the sonic hedgehog and LXRα pathways might be involved in the apoptotic process promoted by 7-KC and triol.
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Affiliation(s)
- Debora Levy
- Laboratory of Genetics and Molecular Hematology (LIM31), Department of Hematology, Hospital das Clínicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, São Paulo, SP, Brazil
| | - Thatiana Correa de Melo
- Laboratory of Genetics and Molecular Hematology (LIM31), Department of Hematology, Hospital das Clínicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, São Paulo, SP, Brazil
| | - Beatriz A. Oliveira
- Laboratory of Genetics and Molecular Hematology (LIM31), Department of Hematology, Hospital das Clínicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, São Paulo, SP, Brazil
| | - Jessica L. Paz
- Laboratory of Genetics and Molecular Hematology (LIM31), Department of Hematology, Hospital das Clínicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, São Paulo, SP, Brazil
| | - Fabio A. de Freitas
- Laboratory of Genetics and Molecular Hematology (LIM31), Department of Hematology, Hospital das Clínicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, São Paulo, SP, Brazil
| | - Cadiele O. Reichert
- Laboratory of Genetics and Molecular Hematology (LIM31), Department of Hematology, Hospital das Clínicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, São Paulo, SP, Brazil
| | | | - Sergio P. Bydlowski
- Laboratory of Genetics and Molecular Hematology (LIM31), Department of Hematology, Hospital das Clínicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, São Paulo, SP, Brazil
- Instituto Nacional de Ciencia e Tecnologia em Medicina Regenerativa (INCT-Regenera), CNPq, Brazil
- Correspondence to: Department of Hematology, Faculdade de Medicina, Universidade de Sao Paulo, Av.Dr. Enéas de Carvalho Aguiar,155, 1st floor, room 43, 05403-000 São Paulo, SP, Brazil.
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