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Related Experiment Videos

Inositol polyphosphates and intracellular calcium release.

S K Joseph1, J R Williamson

  • 1Department of Biochemistry and Biophysics, University of Pennsylvania, Philadelphia 19104.

Archives of Biochemistry and Biophysics
|August 15, 1989
PubMed
Summary

Inositol lipids generate messengers like D-myo-inositol 1,4,5-trisphosphate (Ins 1,4,5-P3), which releases intracellular calcium. Its phosphorylated form, Ins 1,3,4,5-P4, influences calcium entry and ion channel activity.

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Area of Science:

  • Cellular signaling and molecular biology.
  • Calcium homeostasis and ion channel regulation.

Background:

  • Cell surface receptor activation initiates inositol lipid hydrolysis, producing intracellular messengers.
  • Various inositol phosphate isomers accumulate in stimulated cells, playing diverse signaling roles.

Purpose of the Study:

  • To review the properties of D-myo-inositol 1,4,5-trisphosphate (Ins 1,4,5-P3) binding sites and their relation to calcium release.
  • To discuss the biological significance and diverse cellular effects of D-myo-inositol 1,3,4,5-tetraphosphate (Ins 1,3,4,5-P4).

Main Methods:

  • Review of existing literature on inositol phosphate signaling.
  • Summary of progress in the purification of the Ins 1,4,5-P3 receptor from neuronal tissues.

Main Results:

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  • Ins 1,4,5-P3 is identified as the primary messenger for discharging Ca2+ from intracellular stores.
  • Ins 1,4,5-P3 binding sites are detected, potentially located in "calciosomes", and evidence suggests Ins 1,4,5-P3 opens Ca2+ channels.
  • Ins 1,3,4,5-P4 modulates Ca2+ entry, activates ion channels, alters intracellular Ca2+ stores, and affects enzyme activity.

Conclusions:

  • Ins 1,4,5-P3 plays a crucial role in intracellular calcium release, acting through specific binding sites and potentially ion channels.
  • Ins 1,3,4,5-P4 exhibits multifaceted effects on cellular calcium dynamics and ion transport, highlighting its importance in cell signaling.