Myosin heavy chain isoforms of the murine masseter muscle during pre- and post-natal development

Anat Histol Embryol. 2003 Aug;32(4):244-8. doi: 10.1046/j.1439-0264.2003.00481.x.


Masticatory muscles that are derived from the branchial arches express different compositions of myosin heavy chain (MHC) isoforms during the transitional phase from suckling to mastication. To clarify the developmental changes of murine masseter muscle, the composition of MHC isoforms was examined using immunohistochemical staining and competitive reverse transcription PCR. We found that MHC1 was expressed transiently in the pre and post-natal stages. In the compositional change of isoforms, the embryonic type MHCp was expressed consistently, whereas the adult isoforms increased with the developmental process. In particular, a significant change was observed between embryonic days 14 and 16, a stage when murine facial development is conspicuous. This suggests that the development of murine masseter muscle is closely associated with facial development.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aging / physiology
  • Animals
  • Animals, Newborn / growth & development
  • Animals, Newborn / physiology
  • Gene Expression Regulation, Developmental
  • Immunohistochemistry
  • Masseter Muscle / chemistry
  • Masseter Muscle / embryology*
  • Masseter Muscle / growth & development
  • Mice
  • Mice, Inbred ICR / embryology*
  • Mice, Inbred ICR / growth & development*
  • Muscle Development / genetics
  • Muscle Development / physiology*
  • Muscle Fibers, Skeletal / chemistry
  • Muscle Fibers, Skeletal / physiology*
  • Myosin Heavy Chains / genetics
  • Myosin Heavy Chains / physiology*
  • Protein Isoforms / genetics
  • Protein Isoforms / physiology
  • RNA, Messenger / analysis
  • Reverse Transcriptase Polymerase Chain Reaction


  • Protein Isoforms
  • RNA, Messenger
  • Myosin Heavy Chains