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Publicaciones -
Artículos Científicos
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Xiao Wang 1,3 , Angel Ramirez 2 and Irina Budunova 1
1 Department of Dermatology, Northwestern University, Chicago, IL, USA ;
2 Department of Cell and Molecular Biology and Gene Therapy, CIEMAT, Madrid, Spain ;
3 Molecular and Cellular Pathobiology Program and Center for Digestive Diseases and Immunobiology, Children's Memorial Research Center, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
KEYWORDS
connexin26 • keratinocyte • proliferation • protein kinase C • TPA • transgenic mice
ABSTRACT
Please cite this paper as: Overexpression of connexin26 in the basal keratinocytes reduces sensitivity to tumor promoter TPA. Experimental Dermatology 2010; 19: 633–640.
Abstract: Connexin 26 is important in keratinocyte proliferation, differentiation and skin pathologies. Cx26 is barely expressed in normal adult epidermis, but its expression is induced during wound healing, psoriasis, and skin hyperplasia stimulated by tumor promoters. In hyperplastic proliferating epidermis, Cx26 is co-expressed with Cx43 typical for basal and suprabasal keratinocytes. As Cx26 and Cx43 can not form permeable gap junctions, their co-expression may alter the gap junctional communication between keratinocytes and induce proliferation. To test the effect of persistent co-expression of Cx26 and Cx43 in epidermis, we generated transgenic mice using keratin5 promoter to target Cx26 to basal Cx43-positive keratinocytes. We evaluated the effect of ectopic Cx26 on keratinocyte proliferation and differentiation in normal and 12-O-tetradecanoyl-phorbol-13-acetate (TPA)-treated skin. The ectopic Cx26 expression in epidermis did not significantly affect skin development, keratinocyte differentiation and proliferation in newborn and adult skin. Unexpectedly, the proliferative effect of tumor promoter TPA was strongly decreased in epidermis of K5.Cx26 transgenics. This correlated with significant down-regulation of TPA-induced activity of protein kinase C (PKC) in K5.Cx26 mice.
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