Matriptase expression and zymogen activation in human pilosebaceous unit.

Area of Science:

• Dermatology
• Molecular Biology
• Cell Biology

Background:

• Matriptase is implicated in human genetic disorders and mouse models of hair growth.
• Understanding matriptase's role in the hair follicle is crucial for hair biology research.

Purpose of the Study:

• To investigate matriptase expression and zymogen activation within human hair follicles.
• To elucidate the role of the matriptase-HGF-c-MET pathway in the pilosebaceous unit.

Main Methods:

• Analysis of matriptase and HAI-1 expression patterns in different hair follicle layers and phases.
• Assessment of matriptase zymogen activation in specific cell populations.
• In vitro studies on matriptase's activation of HGF and co-expression analysis of HGF receptor c-Met.

Main Results:

• Matriptase shows layer-dependent expression, higher in outer root sheath and bulb matrix cells.
• Expression is cycle-dependent, present in anagen and catagen, absent in telogen.
• Reduced HAI-1 in catagen suggests increased proteolytic activity; highest activation in matrix and bulge cells.
• Matriptase activates HGF in vitro; c-Met is co-expressed with activated matriptase.

Conclusions:

• The matriptase-HGF-c-MET pathway is potentially active in proliferative cells of the pilosebaceous unit.
• Matriptase activity is regulated by expression, inhibitor levels, and activation patterns during the hair cycle.