Insulin/IGF1 signalling mediates the effects of beta(2)-adrenergic agonist on muscle proteostasis and growth

Author(s):Show less -

Goncalves, Dawit A. ^{[1, 2, 3]} ; Silveira, Wilian A. ^[2] ; Manfredi, Leandro H. ^[2] ; Graca, Flavia A. ^[2] ; Armani, Andrea ^{[1, 4]} ; Bertaggia, Enrico ^{[1, 4]} ; O'Neill, Brian T. ^[5] ; Lautherbach, Natalia ^[2] ; Machado, Juliano ^[2] ; Nogara, Leonardo ^{[1, 4]} ; Pereira, Marcelo G. ^[1] ; Arcidiacono, Diletta ^[6] ; Realdon, Stefano ^[6] ; Kahn, C. Ronald ^[5] ; Sandri, Marco ^{[1, 4, 7]} ; Kettelhut, Isis C. ^{[2, 3]} ; Navegantes, Luiz Carlos C. ^[2]

Affiliation

^[1] Univ Padua, Dept Biomed Sci, Padua - Italy

^[2] Univ Sao Paulo, Dept Physiol, Ribeirao Preto Med Sch, BR-14049900 Ribeirao Preto, SP - Brazil

^[3] Univ Sao Paulo, Dept Biochem Immunol, Ribeirao Preto Med Sch, Ribeirao Preto, SP - Brazil

^[4] Venetian Inst Mol Med, Padua - Italy

^[5] Harvard Med Sch, Sect Integrat Physiol & Metab, Joslin Diabet Ctr, Boston, MA 02115 - USA

^[6] IRCCS, Veneto Inst Oncol IOV, Digest Endoscopy Unit, Padua - Italy

^[7] Univ Padua, Myol Ctr, Padua - Italy

• Document type: Journal article
• Source: JOURNAL OF CACHEXIA SARCOPENIA AND MUSCLE; v. 10, n. 2, p. 455-475, APR 2019.
• Web of Science Citations: 1

Abstract

Background Stimulation of beta(2)-adrenoceptors can promote muscle hypertrophy and fibre type shift, and it can counteract atrophy and weakness. The underlying mechanisms remain elusive. Methods Fed wild type (WT), 2-day fasted WT, muscle-specific insulin (INS) receptor (IR) knockout (M-IR-/-), and MKR mice were studied with regard to acute effects of the beta(2)-agonist formoterol (FOR) on protein metabolism and signalling events. MKR mice express a dominant negative IGF1 receptor, which blocks both INS/IGF1 signalling. All received one injection of FOR (300 mu g kg(-1) subcutaneously) or saline. Skeletal muscles and serum samples were analysed from 30 to 240 min. For the study of chronic effects of FOR on muscle plasticity and function as well as intracellular signalling pathways, fed WT and MKR mice were treated with formoterol (300 mu g kg(-1) day(-1)) for 30 days. Results In fed and fasted mice, one injection of FOR inhibited autophagosome formation (LC3-II content, 65%, P <= 0.05) that was paralleled by an increase in serum INS levels (4-fold to 25-fold, P <= 0.05) and the phosphorylation of Akt (4.4-fold to 6.5-fold, P <= 0.05) and ERK1/2 (50% to two-fold, P <= 0.05). This led to the suppression (40-70%, P <= 0.05) of the master regulators of atrophy, FoxOs, and the mRNA levels of their target genes. FOR enhanced (41%, P <= 0.05) protein synthesis only in fed condition and stimulated (4.4-fold to 35-fold, P <= 0.05) the prosynthetic Akt/mTOR/p70S6K pathway in both fed and fasted states. FOR effects on Akt signalling during fasting were blunted in both M-IR-/- and MKR mice. Inhibition of proteolysis markers by FOR was prevented only in MKR mice. Blockade of PI3K/Akt axis and mTORC1, but not ERK1/2, in fasted mice also suppressed the acute FOR effects on proteolysis and autophagy. Chronic stimulation of beta(2)-adrenoceptors in fed WT mice increased body (11%, P <= 0.05) and muscle (15%, P <= 0.05) growth and downregulated atrophy-related genes (30-40%, P <= 0.05), but these effects were abolished in MKR mice. Increases in muscle force caused by FOR (WT, 24%, P <= 0.05) were only partially impaired in MKR mice (12%, P <= 0.05), and FOR-induced slow-to-fast fibre type shift was not blocked at all in these animals. In MKR mice, FOR also restored the lower levels of muscle SDH activity to basal WT values and caused a marked reduction (57%, P <= 0.05) in the number of centrally nucleated fibers. Conclusions NS/IGF1 signalling is necessary for the anti-proteolytic and hypertrophic effects of in vivo beta(2)-adrenergic stimulation and appears to mediate FOR-induced enhancement of protein synthesis. INS/IGF1 signalling only partially contributes to gain in strength and does not mediate fibre type transition induced by FOR. (AU)

• FAPESP's process: 18/10089-2 - Neural, hormonal and nutritional control of autophagy
• Grantee: Isis Do Carmo Kettelhut
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 12/24524-6 - Control of muscle mass by cAMP signaling pathway
• Grantee: Isis Do Carmo Kettelhut
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 12/18861-0 - FOXO HYPERACETYLATION AS A MECHANISM OF SUPPRESSION OF ATROPHY GENE PROGRAM INDUCED BY BETA2-ADRENERGIC SIGNALING IN RODENT SKELETAL MUSCLE
• Grantee: Dawit Albieiro Pinheiro Gonçalves
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 10/11015-0 - Intracellular mechanisms involved in anticatabolic effect of the epinephrine in skeletal muscle of fasted rats
• Grantee: Flávia Aparecida Graça
• Support Opportunities: Scholarships in Brazil - Doctorate