Characterization of angiotensin-converting enzymes 1 and 2 in the soleus and plantaris muscles of rats

Autor(es)

Fernandes, T. ^[1] ; Hashimoto, N. Y. ^[1] ; Oliveira, E. M. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Escola Educ Fis & Esporte, Dept Biodinam Movimento Corpo Humano, Lab Bioquim Atividade Motora, BR-05508900 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Brazilian Journal of Medical and Biological Research; v. 43, n. 9, p. 837-842, SEP 2010.
• Citações Web of Science: 17

Resumo

Angiotensin-converting enzymes 1 (ACE1) and 2 (ACE2) are key enzymes of the renin-angiotensin system, which act antagonistically to regulate the levels of angiotensin II (Ang II) and Ang-(1-7). Considerable data show that ACE1 acts on normal skeletal muscle functions and architecture. However, little is known about ACE1 levels in muscles with different fiber compositions. Furthermore, ACE2 levels in skeletal muscle are not known. Therefore, the purpose of this study was to characterize protein expression and ACE1 and ACE2 activities in the soleus and plantaris muscles. Eight-week-old female Wistar rats (N = 8) were killed by decapitation and the muscle tissues harvested for biochemical and molecular analyses. ACE1 and ACE2 activities were investigated by a fluorometric method using Abz-FRK(Dnp) P-OH and Mca-YVADAPK(Dnp)-OH fluorogenic substrates, respectively. ACE1 and ACE2 protein expression was analyzed by Western blot. ACE2 was expressed in the skeletal muscle of rats. There was no difference between the soleus (type I) and plantaris (type II) muscles in terms of ACE2 activity (17.35 +/- 1.7 vs 15.09 +/- 0.8 uF.min(-1).mg(-1), respectively) and protein expression. ACE1 activity was higher in the plantaris muscle than in the soleus (71.5 +/- 3.9 vs 57.9 +/- 1.1 uF.min(-1).mg(-1), respectively). Moreover, a comparative dose-response curve of protein expression was established in the soleus and plantaris muscles, which indicated higher ACE1 levels in the plantaris muscle. The present findings showed similar ACE2 levels in the soleus and plantaris muscles that might result in a similar Ang II response; however, lower ACE1 levels could attenuate Ang II production and reduce bradykinin degradation in the soleus muscle compared to the plantaris. These effects should enhance the aerobic capacity necessary for oxidative muscle activity. (AU)

• Processo FAPESP: 07/56771-4 - Efeitos do treinamento fisico aerobico na modulacao das celulas progenitoras endoteliais derivadas da medula ossea em ratos espontaneamente hipertensos (shr)
• Beneficiário: Tiago Fernandes
• Modalidade de apoio: Bolsas no Brasil - Mestrado