Abstract
The in vitro effect of CL 316,243 (CL), a selective β3-adrenoceptor agonist in the rate of overall proteolysis, the activity of proteolytic systems (lysosomal, Ca2+-dependent, ATP-dependent, and ATP-independent) and in the process of protein synthesis was investigated in rat skeletal muscles. The rate of overall proteolysis in soleus muscle from rats incubated with CL (10−4 and 10−5 M) or epinephrine (10−5 M) was significantly decreased. In vitro rates of maximal activity of Ca2+-dependent proteolysis in soleus muscles were decreased by about 41% in the presence of 10−5 M CL. No change was observed in the activities of the lysosomal, ATP-dependent or ATP-independent proteolytic systems. The anti-proteolytic effect of CL or epinephrine was partially prevented by 10−5 M SR 59230A, a selective β3-adrenoceptor antagonist. The increase of proteolysis induced by food deprivation in soleus was abolished by in vitro addition of 10−5 M CL. No change in proteolysis was observed in extensor digitorum longus (EDL) muscles incubated with any concentration of the β3-adrenoceptor agonist tested. Rates of protein synthesis were not affected by 10−4 M CL neither in soleus nor EDL. The data suggest that a β3-adrenoceptor-mediated inhibition of Ca2+-dependent proteolysis participates of the antiproteolytic effect of catecholamines in oxidative muscles.
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Acknowledgments
We are grateful to Wyeth-Ayerst Laboratories for providing CL, and Sanofi Midy Research Center for providing SR. This work was supported by grants from the Fundação de Amparo à Pesquisa do Estado de São Paulo (Fapesp 04/2674-0, 97/3950-5 and 03/13080-0) and from the Conselho Nacional de Pesquisa (CNPq 501252/91-6). During this study L.C.C.N. and A.M.B. received fellowship from FAPESP (98/02591-4) and CNPq (142318/03-6), respectively. We are indebted to Elza Aparecida Filippin, Maria Antonieta R.Garófalo, and Victor Diaz Galbán for technical assistance.
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Navegantes, L.C.C., Resano, N.M.Z., Baviera, A.M. et al. CL 316,243, a selective β3-adrenergic agonist, inhibits protein breakdown in rat skeletal muscle. Pflugers Arch - Eur J Physiol 451, 617–624 (2006). https://doi.org/10.1007/s00424-005-1496-1
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DOI: https://doi.org/10.1007/s00424-005-1496-1