Dexamethasone-Induced Arterial Stiffening Is Attenuated by Training due to a Better Balance Between Aortic Collagen and Elastin Levels

Autor(es)

de Paula, Vinicius F. F. ; Tardelli, Lidieli P. P. ; Amaral, Sandra L. L.

• Tipo de documento: Artigo Científico
• Fonte: CARDIOVASCULAR DRUGS AND THERAPY; v. N/A, p. 11-pg., 2023-02-16.

Resumo

PurposeAlthough the cardioprotective benefits of exercise training are well known, the effects of training on dexamethasone (DEX)-induced arterial stiffness are still unclear. This study was aimed at investigating the mechanisms induced by training to prevent DEX-induced arterial stiffness.MethodsWistar rats were allocated into 4 groups and submitted to combined training (aerobic and resistance exercises, on alternate days, 60% of maximal capacity, for 74 d) or were kept sedentary: sedentary control rats (SC), DEX-treated sedentary rats (DS), combined training control (CT), and DEX-treated trained rats (DT). During the last 14 d, rats were treated with DEX (50 mu g/kg per body weight, per day, s.c.) or saline.ResultsDEX increased PWV (+44% vs +5% m/s, for DS vs SC, p<0.001) and increased aortic COL 3 protein level (+75%) in DS. In addition, PWV was correlated with COL3 levels (r=0.682, p<0.0001). Aortic elastin and COL1 protein levels remained unchanged. On the other hand, the trained and treated groups showed lower PWV values (-27% m/s, p<0.001) vs DS and lower values of aortic and femoral COL3 compared with DS.ConclusionAs DEX is widely used in several situations, the clinical relevance of this study is that the maintenance of good physical capacity throughout life can be crucial to alleviate some of its side effects, such as arterial stiffness. (AU)

• Processo FAPESP: 17/00509-1 - Papel do treinamento físico no balanço autonômico, rigidez arterial e rarefação em ratos espontaneamente hipertensos tratados com dexametasona: contribuição dos microRNAs
• Beneficiário: Sandra Lia do Amaral Cardoso
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 19/25603-6 - Papel das citocinas inflamatórias no remodelaento cardíaco de ratos com Estenose Aórtica e tratados com dexametasona
• Beneficiário: Sandra Lia do Amaral Cardoso
• Modalidade de apoio: Auxílio à Pesquisa - Regular