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Related Experiment Videos

The Kit-activating mutation D816V enhances stem cell factor--dependent chemotaxis.

M L Taylor1, J Dastych, D Sehgal

  • 1Laboratory of Allergic Diseases and Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892-1881, USA. mtaylor@niaid.nih.gov

Blood
|August 9, 2001
PubMed
Summary

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The D816V mutation in c-kit enhances the migration of mast cell precursors. This discovery helps explain the abnormal mast cell collections seen in mastocytosis patients.

Area of Science:

  • Hematology
  • Molecular Biology
  • Cell Biology

Background:

  • Mastocytosis is characterized by abnormal mast cell accumulation.
  • The D816V mutation in c-kit is frequently found in mastocytosis patients.
  • This mutation leads to constitutive activation of the Kit tyrosine kinase.

Purpose of the Study:

  • To investigate if the D816V c-kit mutation enhances the chemotaxis of mast cell precursors.
  • To understand the role of this mutation in the pathophysiology of mastocytosis.

Main Methods:

  • Transfection of Jurkat cells with wild-type or D816V mutant Kit.
  • Assessment of cell migration towards stem cell factor (SCF) in the presence of tyrosine kinase inhibitors.
  • Chemotaxis assays using CD34(+)CD117(+) mast cell precursors from mastocytosis patients.

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Main Results:

  • D816V mutant Kit significantly enhanced chemotaxis towards SCF compared to wild-type Kit.
  • Tyrosine kinase inhibitors reduced migration in both cell types, with D816V transfectants showing higher sensitivity.
  • In patient-derived cells, the D816V mutation was significantly enriched in migrated cells compared to pre-migration samples.

Conclusions:

  • The D816V c-kit mutation enhances the chemotaxis of CD117(+) cells.
  • This enhanced migration provides a potential mechanism for the increased mast cell burden in mastocytosis tissues.