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Isolation of Peritoneum-derived Mast Cells and Their Functional Characterization with Ca2+-imaging and Degranulation Assays
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Matriptase expression in the normal and neoplastic mast cells.

Ming-Fang Cheng1, Jong-Shiaw Jin, Huang-Wei Wu

  • 1Department of Pathology, Tri-Service General Hospital and National Defense Medical Center, Sec. 2, Cheng-Kung Road, Neihu 114, Taipei, Taiwan, Republic of China.

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Summary

Matriptase, an enzyme found in epithelium, is also expressed by mast cells. This discovery suggests matriptase may play a role in mast cell function and serve as a diagnostic marker.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Immunology

Background:

  • Matriptase is a serine protease found in human epithelium, linked to cancer progression.
  • Mast cells, involved in immune responses, are increased in neoplasms and may degrade tissue matrix.
  • Trypsin activates matriptase, suggesting cooperative roles in extracellular proteolysis.

Purpose of the Study:

  • To investigate matriptase expression in mast cells.
  • To determine if matriptase is present in neoplastic mast cells.

Main Methods:

  • Immunohistochemical staining of tissues to detect matriptase.
  • Analysis of mast cells in various tissues and neoplasms.

Main Results:

  • Matriptase was detected in nearly all mast cells across different tissues.
  • Neoplastic mast cells also stained positive for matriptase.
  • This is the first reported instance of matriptase expression in mast cells.

Conclusions:

  • Matriptase is expressed by mast cells, both normal and neoplastic.
  • Matriptase expression could serve as a novel marker for mast cells.
  • Matriptase may be involved in the physiopathological functions of mast cells.