Skeletal muscle myoblasts possess a stretch-responsive local angiotensin signalling system

Adam P.W. Johnston, Jeff Baker, Michael De Lisio, Gianni Parise

Research output: Contribution to journalArticlepeer-review

Abstract

A paucity of information exists regarding the presence of local renin-angiotensin systems (RASs) in skeletal muscle and associated muscle stem cells. Skeletal muscle and muscle stem cells were isolated from C57BL/6 mice and examined for the presence of a local RAS using quantitative reverse transcriptase polymerase chain reaction (qRT-PCR), immunohistochemistry (IHC), Western blotting and liquid chromatography-mass spectrometry (LC-MS). Furthermore, the effect of mechanical stimulation on RAS member gene expression was analysed. Whole skeletal muscle, primary myoblasts and C2C12 derived myoblasts and myotubes differentially expressed members of the RAS including angiotensinogen, angiotensin-converting enzyme (ACE), angiotensin II (Ang II) type 1 (AT 1) and type 2 (AT 2). Renin transcripts were never detected, however, mRNA for the 'renin-like' enzyme cathepsin D was observed and Ang I and Ang II were identified in cell culture supernatants from proliferating myoblasts. AT 1 appeared to co-localise with polymerised actin filaments in proliferating myoblasts and was primarily found in the nucleus of terminally differentiated myotubes. Furthermore, mechanical stretch of proliferating and differentiating C2C12 cells differentially induced mRNA expression of angiotensinogen, AT 1 and AT 2. Proliferating and differentiated muscle stem cells possess a local stress-responsive RAS in vitro. The precise function of a local RAS in myoblasts remains unknown. However, evidence presented here suggests that Ang II may be a regulator of skeletal muscle myoblasts.

Original languageEnglish (US)
Pages (from-to)75-84
Number of pages10
JournalJRAAS - Journal of the Renin-Angiotensin-Aldosterone System
Volume12
Issue number2
DOIs
StatePublished - Jun 2011
Externally publishedYes

Keywords

  • Actin
  • angiotensin II
  • mechanical stretch
  • muscle stem cell
  • myoblast.

ASJC Scopus subject areas

  • Internal Medicine
  • Endocrinology

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