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Phospholipidic second messengers and calcium.

L Combettes1, B Berthon, M Claret

  • 1Unité de Recherches INSERM U274, Université Paris-Sud, Orsay, France.

Biochimie
|April 1, 1987
PubMed
Summary
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Signal molecules activate cell responses by generating intracellular messengers from phospholipids. Phosphatidyl inositol (4, 5) bisphosphate hydrolysis yields inositol (1, 4, 5) trisphosphate and diacylglycerol, initiating diverse cellular processes.

Area of Science:

  • Cellular signaling pathways
  • Molecular biology
  • Biochemistry

Background:

  • Signal molecules initiate cellular communication by binding to surface receptors.
  • This binding triggers the generation of intracellular messengers from phospholipids.
  • Phosphatidyl inositol (4, 5) bisphosphate is a key precursor in this signaling cascade.

Purpose of the Study:

  • To elucidate the mechanism by which signal molecules generate intracellular messengers.
  • To identify the specific phospholipid derivatives involved in signal transduction.
  • To understand how these messengers mediate diverse cellular responses.

Main Methods:

  • Investigated the hydrolysis of phosphatidyl inositol (4, 5) bisphosphate.
  • Identified the resulting intracellular messengers: inositol (1, 4, 5) trisphosphate and diacylglycerol.

Related Experiment Videos

  • Examined the downstream effects of these messengers on cellular processes.

    • Main Results:

    • Demonstrated that phosphatidyl inositol (4, 5) bisphosphate is hydrolyzed into inositol (1, 4, 5) trisphosphate and diacylglycerol.
    • Showed that these messengers modulate cytosolic Ca2+ and H+ concentrations.
    • Linked these changes to protein phosphorylations and subsequent cellular responses.

    Conclusions:

    • Inositol-containing phospholipids serve as a critical source of intracellular messengers.
    • Inositol (1, 4, 5) trisphosphate and diacylglycerol are key mediators of signal transduction.
    • These signaling pathways are fundamental to a wide range of cellular functions, including metabolism, secretion, and proliferation.