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Related Experiment Videos

Sphingosine-1-phosphate: extracellular mediator or intracellular second messenger?

T Hla1, M J Lee, N Ancellin

  • 1Center for Vascular Biology, Department of Physiology, School of Medicine, University of Connecticut Health Center, Farmington 06030, USA. hla@sun.uchc.edu

Biochemical Pharmacology
|July 28, 1999
PubMed
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Sphingosine-1-phosphate (SPP) acts as both an extracellular mediator and intracellular messenger, regulating cell functions. Further research is needed to clarify its dual roles and intracellular mechanisms.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Background:

  • Sphingosine-1-phosphate (SPP) is a bioactive lipid metabolite with diverse cellular functions.
  • SPP is recognized as both an extracellular mediator and an intracellular second messenger.
  • Recent discoveries include plasma membrane receptors and SPP-metabolizing enzymes, advancing understanding of SPP biology.

Purpose of the Study:

  • To reevaluate the functions of SPP in light of newly identified plasma membrane receptors.
  • To delineate the signaling properties and functions of known SPP receptors.
  • To investigate the potential intracellular roles of SPP, pending the identification of intracellular receptors.

Main Methods:

  • Review and reevaluation of existing literature on SPP functions.

Related Experiment Videos

  • Analysis of newly identified plasma membrane receptors (e.g., EDG-1).
  • Consideration of structural and evolutionary data for SPP-metabolizing enzymes.

    • Main Results:

    • The identification of plasma membrane receptors necessitates reevaluation of SPP's extracellular signaling roles.
    • Evidence suggests SPP may also function as an intracellular second messenger, supported by conserved enzyme structures.
    • Definitive confirmation of intracellular roles requires the identification of specific intracellular receptors.

    Conclusions:

    • SPP exhibits complex biological activities, acting through both extracellular and potentially intracellular pathways.
    • Clarifying the distinct roles of SPP receptors and intracellular mechanisms is crucial.
    • Further molecular investigation is essential to fully understand SPP's physiological and pathophysiological significance.