| Texto completo | |
| Autor(es): |
Cunha, T. F.
;
Vieira, J. S.
;
Santos, J. B.
;
Coelho, M. A.
;
Brum, P. C.
;
Gabriel-Costa, D.
Número total de Autores: 6
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Brazilian Journal of Medical and Biological Research; v. 55, n. 1, p. 9-pg., 2022-01-01. |
| Resumo | |
The aim of the present study was to verify the role of lactate as a signaling molecule in cardiac tissue under physiological conditions. C57BL6/J male mice were submitted to acute running bouts on a treadmill at different exercise intensities (30, 60, and 90% of maximal speed - Smax) under the effect of two doses (0.5 and 5 mM) of alpha-cyano-4-hydroxycynnamate (CINN), a blocker of lactate transporters. Cardiac lactate levels, activity of the enzymes of glycolytic [hexokinase (HK) and lactate dehydrogenase (LDH)] and oxidative metabolism [citrate synthase (CS)], and expression of genes also related to metabolism [LDH, nuclear factor erythroid 2-related factor 2 (NRF-2), cytochrome oxidase IV (COX-IV), and peroxisome proliferatoractivated receptor gamma coactivator 1-alpha (PGC-1 alpha)] were evaluated. Elevated cardiac lactate levels were observed after high intensity running at 90% of Smax, which were parallel to increased activity of the HK and CS enzymes and mRNA levels of PGC-1 alpha and COX-IV. No changes were observed in cardiac lactate levels in mice running at lower exercise intensities. Interestingly, prior intraperitoneal administration (15 min) of CINN (0.5 mM) significantly reduced cardiac lactate concentration, activities of HK and CS, and mRNA levels of PGC-1 alpha and COX-IV in mice that ran at 90% of Smax. In addition, cardiac lactate levels were significantly correlated to both PGC-1 alpha and COX-IV cardiac gene expression. The present study provides evidence that cardiac lactate levels are associated to gene transcription during an acute bout of high intensity running exercise. (AU) | |
| Processo FAPESP: | 15/22814-5 - Câncer e coração: novos paradigmas de diagnóstico e tratamento |
| Beneficiário: | Carlos Eduardo Negrão |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 11/00728-9 - Contribuição do estresse oxidativo para a ativação das vias NF-kB, FOXO e MAPK na atrofia muscular associada à insuficiência cardíaca: efeito do treinamento físico aeróbico e do tratamento com N-acetilcisteína |
| Beneficiário: | Telma Fátima da Cunha Moraes |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 14/25957-9 - Influência da aptidão aeróbica na homeostase redox: identificação e implicação biológica da oxidação de resíduos cisteína em proteínas do músculo cardíaco e esquelético |
| Beneficiário: | Rodrigo Wagner Alves de Souza |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |