Exercício físico aeróbio potencializa a terapia com células-tronco mesenquimais derivadas do tecido adiposo em ratos com infarto do miocárdio

• Ano de defesa: 2016
• Autor(a) principal: Vieira, Stella de Souza [UNIFESP]
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de São Paulo (UNIFESP)
• Palavras-chave em Português: Exercise training; Cell therapy; Myocardial infarction; Exercício físico; Terapia celular; Infarto do miocárdio; Células-tronco
• Link de acesso: https://sucupira.capes.gov.br/sucupira/public/consultas/coleta/trabalhoConclusao/viewTrabalhoConclusao.jsf?popup=true&id_trabalho=3810369; https://repositorio.unifesp.br/handle/11600/46796

Aims: To analyze the effect of prior exercise training to myocardial infarction (MI) in the cardiac remodeling of rats undergoing therapy with mesenchymal stem cells from adipose tissue (ADSC). Methods: The study included 130 Fisher-344 rats allocated in one of the following groups: SHAM; IMC (infarcted control); T+IM (animals trained previously to IM); IM+CDTA (infarcted animals treated with ADSC); T+IM+CDTA (animals trained previously to IM and treated with ADSC) Exercise training consisted of five weekly sessions of 90 minutes of swimming, for nine weeks. The following analyses were conducted: peak oxygen consumption (VO2peak), cardiac structure and function, myocardial inotropism, apoptosis and capillary density. Molecular analyses were performed with quantitative PCR and Western blot. The myocardial detection of ADSC was performed after 60 minutes and seven days of transplantation by SRY gene expression and radiolabeling Results: Cell therapy led to attenuation of cardiac hypertrophy (SHAM 139±4; IMC 244±3*; T+IM 199±2*; IM+CDTA 171±2#; T+IM+CDTA 163±1#. *p<0,05 vs. SHAM e #p<0,05 vs. IMC), cavity dilatation (SHAM 3±5; IMC 26±5*; T+IM 29±4*; IM+CDTA 17±2; T+IM+CDTA 16±2. *p<0,05 vs. SHAM), improvement in ventricular function (SHAM 24±6; IMC -18±2*; T+IM -12±4*; IM+CDTA 19±3; T+IM+CDTA 38±2) and increased myocardial inotropismo (SHAM 54±1; IMC 31±7*; T+IM 22±8*; IM+CDTA 35±1; T+IM+CDTA 42±2#. *p<0,05 vs. SHAM e #p<0,05 vs. IMC).. Additional benefits of CDTA to capillarity, apoptosis, and fibrosis in the infarcted myocardium were found. The effects of cell therapy were potentiated with the exercise. This effect may be related to higher ADSC content in myocardial tissue and attenuation of inflammatory profile related to exercise. Conclusion: Exercise training positively influenced cell therapy-related attenuation in post-infarction cardiac remodeling, in which the benefits were related to changes in the myocardial microenvironment, providing improved receptor niche for transplantation.