Myostatin promotes distinct responses on protein metabolism of skeletal and cardiac muscle fibers of rodents

Author(s)

Manfredi, L. H. ^{[1, 2]} ; Paula-Gomes, S. ^[3] ; Zanon, N. M. ^[1] ; Kettelhut, I. C. ^{[1, 3]}

Affiliation

^[1] Univ Sao Paulo, Fac Med Ribeirao Preto, Dept Fisiol, Ribeirao Preto, SP - Brazil

^[2] Univ Fed Fronteira Sul, Curso Med, Chapeco, SC - Brazil

^[3] Univ Sao Paulo, Fac Med Ribeirao Preto, Dept Bioquim & Imunol, Ribeirao Preto, SP - Brazil

• Document type: Journal article
• Source: Brazilian Journal of Medical and Biological Research; v. 50, n. 12 2017.
• Web of Science Citations: 3

Abstract

Myostatin is a novel negative regulator of skeletal muscle mass. Myostatin expression is also found in heart in a much less extent, but it can be upregulated in pathological conditions, such as heart failure. Myostatin may be involved in inhibiting protein synthesis and/or increasing protein degradation in skeletal and cardiac muscles. Herein, we used cell cultures and isolated muscles from rats to determine protein degradation and synthesis. Muscles incubated with myostatin exhibited an increase in proteolysis with an increase of Atrogin-1, MuRF1 and LC3 genes. Extensor digitorum longus muscles and C2C12 myotubes exhibited a reduction in protein turnover. Cardiomyocytes showed an increase in proteolysis by activating autophagy and the ubiquitin proteasome system, and a decrease in protein synthesis by decreasing P70S6K. The effect of myostatin on protein metabolism is related to fiber type composition, which may be associated to the extent of atrophy mediated effect of myostatin on muscle. (AU)

• FAPESP's process: 12/24524-6 - Control of muscle mass by cAMP signaling pathway
• Grantee: Isis Do Carmo Kettelhut
• Support type: Research Projects - Thematic Grants
• FAPESP's process: 08/06694-6 - Neural control of protein metabolism
• Grantee: Isis Do Carmo Kettelhut
• Support type: Research Projects - Thematic Grants