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Related Experiment Videos

Nuclear lipid signaling.

Robin F Irvine1

  • 1Department of Pharmacology, University of Cambridge, Cambridge CB2 1QJ, UK. rfi20@cam.ac.uk

Science'S STKE : Signal Transduction Knowledge Environment
|September 19, 2002
PubMed
Summary
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Nuclear phospholipids form proteolipid complexes, not bilayers, and are involved in intranuclear signaling. A phospholipase C (PI-PLC) system generates diacylglycerol (DAG) and inositol 1,4,5-trisphosphate [Ins(1,4,5)P3], influencing protein kinase C (PKC) and calcium levels.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Phospholipids exist within the nucleus, resisting detergent washes and forming proteolipid complexes.
  • These nuclear lipids are not part of the nuclear envelope's bilayer membrane structure.

Purpose of the Study:

  • To review experimental evidence supporting the existence and function of intranuclear phospholipids.
  • To discuss the intranuclear phospholipase C (PI-PLC) signaling system and its components.

Main Methods:

  • Review of existing experimental evidence on nuclear lipid localization and function.
  • Analysis of the proposed intranuclear PI-PLC signaling pathway.

Main Results:

  • Nuclear phospholipids form complexes with unidentified proteins.

Related Experiment Videos

  • The intranuclear PI-PLC system generates diacylglycerol (DAG) and inositol 1,4,5-trisphosphate [Ins(1,4,5)P3].
  • DAG recruits protein kinase C (PKC) to the nucleus; Ins(1,4,5)P3 may mobilize nuclear calcium (Ca2+).

    • Conclusions:

    • The intranuclear PI-PLC system is complex, with multiple synthesis routes and regulatory points.
    • Emerging evidence suggests roles for other lipid signaling pathways, including sphingolipids and 3-phosphorylated inositol lipids, in nuclear signaling.