Down-Regulation of SLC8A1 as a Putative Apoptosis Evasion Mechanism by Modulation of Calcium Levels in Penile Carcinoma

Autor(es):Mostrar menos -

Munoz, Juan J. ^{[1, 2]} ; Drigo, Sandra A. ^[3] ; Barros-Filho, Mateus C. ^[1] ; Marchi, Fabio A. ^[1] ; Scapulatempo-Neto, Cristovam ^[4] ; Pessoa, Gustavo S. ^[5] ; Guimaraes, Gustavo C. ; Trindade Filho, Jose Carlos S. ^[3] ; Lopes, Ademar ^[6] ; Arruda, Marco A. Z. ^[5] ; Rogatto, Silvia R. ^{[1, 3]}

Afiliação do(s) autor(es)

^[1] AC Camargo Canc Ctr, Int Res Ctr, Sao Paulo - Brazil

^[2] Sao Paulo State Univ Univ Estadual Paulista, Dept Genet, Inst Biosci, Botucatu, SP - Brazil

^[3] Sao Paulo State Univ Univ Estadual Paulista, Dept Urol, Fac Med, Botucatu, SP - Brazil

^[4] Barretos Canc Hosp, Dept Pathol, Sao Paulo - Brazil

^[5] Univ Estadual Campinas, Grp Spectrometry Sample Preparat & Mech, Campinas, SP - Brazil

^[6] AC Camargo Canc Ctr, Dept Pelv Surg, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF UROLOGY; v. 194, n. 1, p. 245-251, JUL 2015.
• Citações Web of Science: 15

Resumo

Purpose: The SLC8A1 gene, which encodes the Na+/Ca2(+) exchanger, has a key role in calcium homeostasis. Our previous gene expression oligoarray data revealed SLC8A1 under expression in penile carcinoma. We investigated whether dysregulation of SLC8A1 expression is associated with apoptosis and cell proliferation in penile carcinoma via modulation of the calcium concentration. The underlying mechanisms of SLC8A1 under expression were also explored, focusing on copy number alteration and miRNA. Materials and Methods: Transcript levels of the SLC8A1 gene and miR-223 were evaluated by quantitative polymerase chain reaction to compare penile carcinoma samples with normal glans tissue. SLC8A1 copy number was evaluated by microarray based comparative genomic hybridization. In normal and tumor samples we investigated caspase-3 and Ki-67 immunostaining as well as calcium distribution by laser ablation imaging inductively coupled plasma mass spectrometry. Results: SLC8A1 under expression was detected in penile carcinoma samples (p = 0.001), confirming our previous data. It was not associated with gene copy number loss. In contrast, miR-223 over expression (p = 0.002) inversely correlated with its putative repressor SLC8A1 (r = -0.426, p = 0.015). SLC8A1 under expression was associated with decreased calcium distribution, high Ki-67 and low caspase-3 immunoexpression in penile carcinoma compared to normal tissue. Conclusions: Down-regulation of the SLC8A1 gene, most likely mediated by its regulator miR-223, can lead to decreased calcium in penile carcinoma and consequently to suppressed apoptosis and increased tumor cell proliferation. These data suggest that the miR-223-NCX1-calcium signaling axis may represent a potential therapeutic approach to penile carcinoma. (AU)

• Processo FAPESP: 09/52088-3 - O carcinoma de pênis: estudo de um problema brasileiro abordando da morfologia aos mecanismos moleculares
• Beneficiário: José Vassallo
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 10/51601-6 - Perfil de metilação em carcinoma de pênis
• Beneficiário: Silvia Regina Rogatto
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 12/21344-7 - Estudos metalômicos aplicados a espécies geneticamente modificadas de soja [Glycine max (L.) Merrill] e Arabidopsis thaliana
• Beneficiário: Marco Aurelio Zezzi Arruda
• Modalidade de apoio: Auxílio à Pesquisa - Regular