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Related Experiment Videos

N,N-dimethylsphingosine 1-phosphate activates human platelets

Y Yatomi1, S Yamamura, F Ruan

  • 1Department of Laboratory Medicine, Yamanashi Medical University, Japan.

FEBS Letters
|December 31, 1997
PubMed
Summary

N,N-dimethylsphingosine 1-phosphate (DMS-1-P) activates platelets by mobilizing calcium and altering shape. This suggests DMS-1-P interacts with the platelet receptor for sphingosine 1-phosphate (Sph-1-P).

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Hematology

Background:

  • N,N-dimethylsphingosine 1-phosphate (DMS-1-P) is formed from N,N-dimethylsphingosine (DMS) in activated platelets.
  • Sphingolipids play crucial roles in cellular signaling, including platelet activation.

Purpose of the Study:

  • To synthesize DMS-1-P and investigate its functional effects on platelets.
  • To explore the interaction of DMS-1-P with platelet surface receptors.

Main Methods:

  • Chemical synthesis of DMS-1-P.
  • Assessment of platelet responses: intracellular Ca2+ mobilization, shape change, aggregation, and release reactions.
  • Competitive binding assays using radiolabeled Sphingosine 1-phosphate ([3H]Sph-1-P).

Main Results:

Related Experiment Videos

  • Synthesized DMS-1-P induced platelet intracellular Ca2+ mobilization and shape change, but not aggregation or release.
  • DMS-1-P demonstrated competitive binding with [3H]Sph-1-P, similar to unlabeled Sph-1-P.
  • Exogenous DMS showed no activity on platelets.

Conclusions:

  • DMS-1-P is a bioactive sphingolipid that activates platelets.
  • Platelet activation by DMS-1-P likely occurs through interaction with the platelet surface receptor for Sph-1-P.
  • DMS-1-P may play a role in platelet function and signaling pathways involving sphingolipids.