Activation of Keratinocyte Protein Kinase C Zeta in Psoriasis Plaques

Overview

Journal J Invest Dermatol

Publisher Elsevier

Specialty Dermatology

Date 2008 Apr 4

PMID 18385757

Citations 16

Authors

Yuming Zhao

Rita Fishelevich

John P Petrali

Lida Zheng

Malinina Alla Anatolievna

April Deng

Richard L Eckert

Anthony A Gaspari

Affiliations

Soon will be listed here.

Abstract

PKCzeta (protein kinase C-zeta), a member of protein kinase C family, plays an important role in cell proliferation, differentiation, and apoptosis. It acts as a downstream molecule for TNF-alpha (tumor necrosis factor) signal transduction and also regulates the expression of CD1d, an HLA-class I-like molecule. The interaction of CD1d with natural killer T (NKT) cells has been shown to be important in their Th1 cytokine production in psoriasis. In this study, we examined PKCzeta in psoriasis in order to define its role in the pathogenesis of the disease. We found that T-cell receptor (TCR) V alpha24+ V beta11+ NKT cells and CD1d molecules within psoriatic skin were increased. Moreover, there was an associated increase in PKCzeta mRNA and protein expression with membrane translocation in psoriasis lesions compared to uninvolved skin. Furthermore, cultured keratinocytes exhibited increased PKCzeta activity and membrane translocation upon stimulation by TNF-alpha, a cytokine known to play an important role in the pathogenesis of psoriasis. These results implied that PKCzeta is an important transduction molecule downstream of TNF-alpha signaling and is associated with increased expression of CD1d that may enhance CD1d-NKT cell interactions in psoriasis lesions. This makes PKCzeta a tempting target for possible pharmacological intervention in modifying the downstream effects of TNF-alpha in psoriasis.

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