Adaptive mechanisms of intracellular calcium homeostasis in mammalian hibernators

Shi Quiang Wang, Edward G. Lakatta, Heping Cheng, Zeng Quan Zhou

Research output: Contribution to journalArticlepeer-review

Abstract

Intracellular Ca2+ homeostasis is a prerequisite for a healthy cell life. While cells from some mammals may suffer dysregulation of intracellular Ca2+ levels under certain deleterious and stressful conditions, including hypothermia and ischemia, cells from mammalian hibernators exhibit a remarkable ability to maintain a homeostatic intracellular Ca2+ environment. Compared with cells from non-hibernators, hibernator cells are characterized by downregulation of the activity of Ca2+ channels in the cell membrane, which helps to prevent excessive Ca2+ entry. Concomitantly, sequestration of Ca2+ by intracellular Ca2+ stores, especially the sarcoplasmic/endoplasmic reticulum, is enhanced to keep the resting levels of intracellular Ca2+ stable. An increase in stored Ca2+ in heart cells during hibernation ensures that the levels of Ca2+ messenger are sufficient for forceful cell contraction under conditions of hypothermia. Maintenance of Na+ gradients, via Na+-Ca2+ exchangers, is also important in the Ca2+ homeostasis of hibernator cells. Understanding the adaptive mechanisms of Ca2+ regulation in hibernating mammals may suggest new strategies to protect nonhibernator cells, including those of humans, from Ca2+-induced dysfunction.

Original languageEnglish (US)
Pages (from-to)2957-2962
Number of pages6
JournalJournal of Experimental Biology
Volume205
Issue number19
StatePublished - Oct 1 2002
Externally publishedYes

Keywords

  • Adaptation
  • Ca metabolism
  • Excitation-contraction coupling
  • Hibernation
  • Homeostasis

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Physiology
  • Aquatic Science
  • Animal Science and Zoology
  • Molecular Biology
  • Insect Science

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