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IP(3), IP(3) receptor, and cellular senescence.

M S Huang1, O A Adebanjo, E Awumey

  • 1University of Arkansas for Medical Sciences and Veterans Affairs Geriatrics Research, Education, and Clinical Center, Little Rock, Arkansas 72205, USA.

American Journal of Physiology. Renal Physiology
|April 6, 2000
PubMed
Summary

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Cellular senescence reduces inositol 1,4,5-trisphosphate (IP(3)) receptor levels, impairing calcium (Ca(2+)) signaling. This study shows decreased IP(3) receptor expression and function in senescent human diploid fibroblasts.

Area of Science:

  • Cell Biology
  • Biochemistry
  • Physiology

Background:

  • Cellular senescence is a state of irreversible growth arrest.
  • Calcium (Ca(2+)) signaling plays a critical role in various cellular processes.
  • Inositol 1,4,5-trisphosphate (IP(3)) receptors mediate Ca(2+) release from intracellular stores.

Purpose of the Study:

  • To investigate the impact of replicative cellular senescence on IP(3) receptor expression and function.
  • To determine the consequences of altered IP(3) signaling on Ca(2+) dynamics in senescent cells.

Main Methods:

  • Comparison of young and senescent human diploid fibroblasts (HDFs) based on population doublings.
  • Measurement of mitogen-evoked IP(3) formation and Ca(2+) release.
  • Western blot analysis of IP(3) receptor protein levels.

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Main Results:

  • Senescent HDFs exhibited significantly reduced IP(3) receptor protein levels (approx. 50% decrease).
  • Mitogen-stimulated IP(3) formation and Ca(2+) release were markedly attenuated in senescent cells.
  • Senescent cells showed diminished Ca(2+) release in response to applied IP(3) and Ca(2+) store depletion.

Conclusions:

  • Reduced IP(3) receptor expression and impaired IP(3) generation contribute to deficient Ca(2+) signaling in replicative senescence.
  • Altered Ca(2+) homeostasis in senescent cells may have implications for tissue function and aging.