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Characterization of matriptase expression in normal human tissues.

Michael D Oberst1, Baljit Singh, Metin Ozdemirli

  • 1Lombardi Cancer Center, Georgetown University Medical Center, Washington, DC 20057, USA.

The Journal of Histochemistry and Cytochemistry : Official Journal of the Histochemistry Society
|July 23, 2003
PubMed
Summary
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Matriptase, a protease in epithelial cells, is broadly expressed in normal human tissues. Its expression varies spatially, suggesting regulation during epithelial cell differentiation.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Matriptase is a type II transmembrane serine protease.
  • It is implicated in the progression of epithelium-derived tumors.
  • Its role in normal epithelial cell biology is not fully understood.

Purpose of the Study:

  • To systematically analyze the distribution of matriptase protein and mRNA in normal human tissues.
  • To characterize matriptase expression across various epithelial cell types.

Main Methods:

  • Utilized a tissue microarray and whole tissue specimens.
  • Analyzed matriptase protein expression via immunohistochemistry (implied by immunoreactivity).
  • Assessed matriptase mRNA expression.

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Main Results:

  • Significant matriptase immunoreactivity and mRNA expression were detected in the epithelial components of most epithelium-containing tissues.
  • Matriptase expression was observed in all major epithelium types: columnar, pseudostratified columnar, cuboidal, and squamous.
  • Distinct spatial distributions of matriptase reactivity were noted within the microanatomy of specific tissues.

Conclusions:

  • Matriptase is broadly expressed in normal human epithelial cells.
  • Tissue-specific and cell-type-specific regulation of matriptase expression occurs.
  • Regulation at the protein and mRNA levels may control matriptase activity during epithelial differentiation.