Role of protease-activated receptors in human skin fibrosis and scleroderma.

Abstract:

:Proteases and their receptors have poorly understood roles in skin fibrosis and systemic scleroderma (SSc). We examined the role of protease-activated receptors (PAR(1) and PAR(2) ) in the pathophysiology of human SSc and skin fibrosis. Immunohistochemistry showed that PAR(1) immunoreactivity was positive in fibroblasts of SSc skin and healthy skin. PAR(2) immunoreactivity was positive in SSc skin, but negative in endothelial cells and fibroblasts of healthy skin. Double immunofluorescence using an antibody against smooth muscle actin (α-SMA) as a marker for myofibroblasts verified a certain percentage of myofibroblasts positive for PAR(1) and PAR(2) in SSc skin. In human dermal cultured fibroblasts (HDF), PAR(1) stimulation with or without bleomycin pretreatment mobilized intracellular calcium, indicating that the expressed PARs are functional and have effects on downstream signalling by calcium release. PAR(2) -induced intracellular calcium mobilization was only measurable in HDF after bleomycin pretreatment. Thus, PAR(1) - and PAR(2) -positive fibroblasts are increased in SSc, indicating a regulatory role. Intriguingly, bleomycin activated PAR(2) in HDF indicating that fibrosis-promoting factors have a direct effect on PAR(2) expression and functionality.

journal_name

Exp Dermatol

journal_title

Experimental dermatology

authors

Cevikbas F,Seeliger S,Fastrich M,Hinte H,Metze D,Kempkes C,Homey B,Steinhoff M

doi

10.1111/j.1600-0625.2010.01184.x

subject

Has Abstract

pub_date

2011-01-01 00:00:00

pages

69-71

issue

1

eissn

0906-6705

issn

1600-0625

journal_volume

20

pub_type

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