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Journal of Muscle Research & Cell Motility

, Volume 11, Issue 3, pp 203–215 | Cite as

Physiological properties of the dorsal longitudinal flight muscle and the tergal depressor of the trochanter muscle ofDrosophila melanogaster

  • M. Peckham
  • J. E. Molloy
  • J. C. Sparrow
  • D. C. S. White
Papers

Summary

A prerequisite for using muscle mutants to study contraction inDrosophila melanogaster is a description of the mechanics of wild-type muscles. Here we describe the mechanics of two different wild-type muscles; the dorsal longitudinal flight muscle which is asynchronous (nerve impulses are not synchronised with each contraction), and a leg muscle, the tergal depressor of the trochanter, which is synchronous. We have compared their mechanics to those of the asynchronous flight and the synchronous leg muscle from the giant waterbugLethocerus indicus.

We found that the mechanics of the asynchronous flight muscles from the two species were similar. At rest length both muscles had a high relaxed stiffness, were partially activated by Ca2+ (low steady-state active tension) and, once activated, had a large delayed increase in tension, which was well maintained, in response to a rapid stretch. The rate constant for the delayed increase in tension was about 10 times greater forD. melanogaster than forL. indicus under the same conditions. The mechanics of the synchronous leg muscles from both species were different from those of the flight muscles and resembled those of other synchronous muscles such as vertebrate striated muscle. At rest length, both muscles had a lower relaxed stiffness than the flight muscles, were fully activated by Ca2+ (high steady-state active tension) and, once activated, had a small delayed increase in tension, which was less well maintained, in response to a rapid stretch. The rate constant for the delayed increase in tension was similar for the leg muscles of both species.

The different mechanical properties of the flight and leg muscles must arise from differences in their contractile proteins. The demonstration that satisfactory mechanical responses can be obtained from the small (less than 1 mm long) muscles ofD. melanogaster will enable future responses from mutant muscles to be tested.

Keywords

Mechanical Property Striate Muscle Mechanical Response Physiological Property Contractile Protein 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman and Hall Ltd 1990

Authors and Affiliations

  • M. Peckham
    • 1
  • J. E. Molloy
    • 1
  • J. C. Sparrow
    • 1
  • D. C. S. White
    • 1
  1. 1.Department of BiologyUniversity of YorkYork

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