Connective tissue growth factor is induced in bleomycin-induced skin scleroderma

Area of Science:

• Dermatology
• Cell Biology
• Fibrosis Research

Background:

• The cellular origins of fibrotic tissue remain incompletely understood.
• The specific contribution of microvascular pericytes to myofibroblast populations in dermal fibrosis is uncertain.
• Connective tissue growth factor (CTGF/CCN2) is recognized as a key mediator and marker of fibrotic processes.

Purpose of the Study:

• To investigate the cell types expressing CCN2 in mouse dermis during bleomycin-induced skin scleroderma.
• To determine the contribution of pericytes to myofibroblast populations in this fibrosis model.

Main Methods:

• Utilized an antibody targeting CCN2 to examine cell expression in control and bleomycin-injected mouse dermis.
• Assessed expression of alpha-smooth muscle actin (alpha-SMA) to identify myofibroblasts.
• Evaluated NG2 expression to detect pericytes.

Main Results:

• CCN2 expression was minimal in control dermis but significantly induced in bleomycin-treated skin.
• CCN2-expressing cells were identified as alpha-SMA-positive myofibroblasts.
• Approximately 85% of myofibroblasts were NG2-positive and expressed CCN2, indicating a substantial pericyte contribution.

Conclusions:

• CCN2 is induced in fibrotic skin and correlates with myofibroblast induction.
• CCN2-expressing pericytes significantly contribute to the myofibroblast population in bleomycin-induced skin scleroderma.
• These findings highlight the role of pericytes in the pathogenesis of dermal fibrosis.