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Receptor Tyrosine Kinases

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Analyzing the Functions of Mast Cells In Vivo Using 'Mast Cell Knock-in' Mice
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Analyzing the Functions of Mast Cells In Vivo Using 'Mast Cell Knock-in' Mice

Published on: May 27, 2015

The protein tyrosine kinase Tec regulates mast cell function.

Uwe Schmidt1, Anastasia Abramova, Nicole Boucheron

  • 1Division of Immunobiology, Institute of Immunology, Center for Physiology, Pathophysiology and Immunology, Medical University of Vienna, Austria.

European Journal of Immunology
|August 19, 2009
PubMed
Summary

The protein tyrosine kinase Tec regulates mast cell function, impacting cytokine and leukotriene production. Tec deficiency impairs IL-4, GM-CSF, TNF-alpha, and IL-13 release, highlighting its crucial role in mast cell responses.

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11:31

Isolation of Peritoneum-derived Mast Cells and Their Functional Characterization with Ca2+-imaging and Degranulation Assays

Published on: July 4, 2018

Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • Mast cells are critical immune cells involved in various physiological and pathological processes.
  • Tight regulation of mast cell activation is essential for maintaining homeostasis and preventing disease.
  • Protein tyrosine kinases play significant roles in signal transduction pathways governing immune cell function.

Purpose of the Study:

  • To investigate the role of the protein tyrosine kinase Tec in regulating murine mast cell function.
  • To elucidate the specific downstream signaling pathways affected by Tec in mast cells.
  • To compare the function of Tec with its family member Btk in mast cell activation.

Main Methods:

  • Utilized bone marrow-derived mast cells (BMMC) from wild-type (WT) and Tec-deficient (Tec(-/-)) mice.
  • Stimulated BMMC via Fc epsilon RI signaling.
  • Quantified the release of histamine, leukotriene C4, and various cytokines (IL-4, GM-CSF, TNF-alpha, IL-13) using appropriate assays.
  • Performed comparative analysis using Btk-deficient (Btk(-/-)) and double-deficient (Tec(-/-)Btk(-/-)) BMMC.

Main Results:

  • Tec activation was observed upon Fc epsilon RI stimulation in BMMC.
  • Histamine release was unaffected in Tec(-/-) BMMC.
  • Leukotriene C4 production was significantly reduced in Tec(-/-) BMMC.
  • Interleukin-4 (IL-4) production was severely impaired in Tec(-/-) BMMC.
  • Granulocyte-macrophage colony-stimulating factor (GM-CSF), Tumor Necrosis Factor-alpha (TNF-alpha), and Interleukin-13 (IL-13) levels were diminished in Tec(-/-) BMMC.
  • Btk deficiency negatively regulated IL-4 production, while both Tec and Btk were required for efficient TNF-alpha, IL-13, and GM-CSF production.

Conclusions:

  • The protein tyrosine kinase Tec is a crucial regulator of murine mast cell function.
  • Tec plays a distinct role in mast cell activation, partially differing from the known functions of Btk.
  • Tec deficiency significantly impacts the production of key inflammatory mediators, including leukotrienes and cytokines, underscoring its importance in mast cell-mediated immune responses.