Cell and Tissue Research

, Volume 255, Issue 2, pp 385–391

A comparison of muscle precursor replication in crush-injured skeletal muscle of Swiss and BALBc mice

  • Miranda D. Grounds
  • John K. McGeachie
Article

Summary

Muscle precursor replication in Swiss mice, in which muscle regeneration is exceptionally vigorous, was compared with previous data for regeneration in BALBc mice. The tibialis anterior muscles of 23 male and 15 female inbred Swiss SJL/J mice were crush injured, and tritiated thymidine injected into mice at various times after injury to label replicating muscle precursors. Lesion samples were taken 10 days after injury, processed for autoradiography, and grain counts of myotube nuclei analysed. Muscle regeneration was more vigorous in male compared with female Swiss mice, and in both was strikingly greater than that in BALBc mice in which there was extensive fibrous connective tissue throughout the lesions. Autoradiographic analysis showed that muscle precursor replication started at 24 hours in Swiss mice, 6 hours earlier than the onset at 30 hours in BALBc mice. Muscle precursor replication appeared to be more active 96 hours after injury in female Swiss compared with male BALBc and male Swiss mice respectively, although numbers of precursor cells replicating at other times were similar. It is not known whether the slight difference in onset of muscle precursor replication can alone account for the more complete muscle regeneration seen in Swiss mice. Similar studies were carried out in 11 male and 10 female F1 hybrid (SJL/J x BALBc) mice. Analysis of labelled myotube nuclei showed that muscle precursors did not synthesise DNA prior to 30 hours after injury, and regeneration resembled that of the parental BALBc strain.

Key words

Myogenesis Muscle regeneration Genetics Autoradiography Tritiated thymidine Mouse (Swiss;BALBc) 

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Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • Miranda D. Grounds
    • 1
  • John K. McGeachie
    • 2
  1. 1.Department of PathologyUniversity of Western AustraliaNedlands
  2. 2.Department of Anatomy and Human BiologyUniversity of Western AustraliaNedlands
  3. 3.University Department of PathologyQueen Elizabeth II Medical CentreNedlands

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