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Intracellular Ca2+ and cytotoxicity.

W S Lynn1, D Mathews, M Cloyd

  • 1Department of Preventive Medicine and Community Health, University of Texas Medical Branch, Galveston.

Archives of Environmental Health
|September 1, 1989
PubMed
Summary
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Chronic elevation of intracellular calcium (Ca2+) triggers cell death by disrupting lipid metabolism and trace metal balance, affecting immune cells and potentially linked to HIV.

Area of Science:

  • Cell Biology
  • Immunology
  • Biochemistry

Background:

  • Elevated intracellular calcium (Ca2+) is an early indicator of cell injury or activation preceding cell death in immune cells.
  • Various agents, including HIV, TNF, and cholesterol derivatives, can increase Ca2+ levels and induce cytotoxicity.

Purpose of the Study:

  • To investigate the link between elevated intracellular Ca2+ and cell death.
  • To explore the role of lipid metabolism and trace metal balance in Ca2+-induced cytotoxicity.

Main Methods:

  • Examined the effects of various agents known to elevate Ca2+ on cell viability.
  • Analyzed the impact of these agents on lipid biosynthesis (triglycerides, cholesterol esters, phospholipids) and trace metal (Zn2+, Cd2+) metabolism.

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Main Results:

  • Ca2+-elevating agents showed additive effects on cytotoxicity.
  • Cell death was associated with altered lipid metabolism, including accelerated synthesis of triglycerides and cholesterol esters, and declining phospholipid synthesis.
  • Imbalances in Zn2+ and Cd2+ metabolism were observed, with glucocorticoids blocking Zn2+ uptake.

Conclusions:

  • Chronic elevation of intracellular Ca2+ by diverse agents leads to cell death.
  • This cytotoxicity results from disruptions in cellular biosynthetic pathways, particularly lipid metabolism, and imbalances in essential trace metals like Zn2+.