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Related Experiment Videos

Smooth muscle stretch-activated phospholipase C activity

H Matsumoto1, C B Baron, R F Coburn

  • 1Department of Physiology, University of Pennsylvania School of Medicine, Philadelphia 19104.

The American Journal of Physiology
|February 1, 1995
PubMed
Summary

Mechanical stretch activates phospholipase C (PLC) in aortic muscles, increasing inositol phosphates. This response is mediated by calcium influx through gadolinium-sensitive channels.

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Area of Science:

  • Biochemistry
  • Cell Physiology
  • Mechanobiology

Background:

  • Vascular smooth muscle cells respond to mechanical stimuli.
  • Inositol phosphates play crucial roles in cellular signaling.

Purpose of the Study:

  • To investigate the effect of mechanical stretch on phospholipase C (PLC) activity in rabbit aortic muscles.
  • To determine the signaling pathways involved in stretch-induced PLC activation.

Main Methods:

  • Rabbit aortic muscles were subjected to controlled mechanical stretch.
  • Levels of inositol 1,4,5-trisphosphate [Ins(1,4,5)P3] and inositol 1,4-bisphosphate [Ins(1,4)P2] were measured over time post-stretch.
  • Phospholipase C (PLC) activity and ion channel involvement (gadolinium, nifedipine) were assessed.

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Main Results:

  • Mechanical stretch to 1.0 Lmax significantly increased Ins(1,4,5)P3 and Ins(1,4)P2 levels, peaking around 500 ms.
  • The stretch threshold for PLC activation was 0.85 Lmax, with a latency of 275-375 ms.
  • Stretch-activated PLC activity involved Ca2+ influx via gadolinium-sensitive, but not nifedipine-sensitive, ion channels.

Conclusions:

  • Mechanical stretch activates PLC in aortic muscles, leading to increased inositol phosphate production.
  • Calcium influx through specific ion channels is critical for this mechanotransduction pathway.