PMID: 9008237Feb 1, 1997Paper

Fas signal transduction triggers either proliferation or apoptosis in human fibroblasts

The Journal of Investigative Dermatology
R A FreibergP A Khavari

Abstract

Although shown to be highly expressed by the epidermis in inflammatory skin disease, the ability of the Fas protein to trigger apoptosis in the distinct cell subpopulations of cutaneous tissue, particularly with regard to receptor density and the degree of crosslinking, has not been fully characterized. We therefore determined the effect of Fas cross-linking in primary human dermal fibroblasts at both high and low levels of Fas receptor expression. First, we examined the effects of the anti-Fas monoclonal antibody, CH-11, on fibroblasts expressing low basal levels of Fas. In these cells Fas aggregation stimulated proliferation by 160 +/- 10% over untreated controls. In contrast, the same concentration of CH-11 had an inhibitory effect on epidermal keratinocyte growth. Because Fas is upregulated in inflamed skin, we next examined the effects of Fas cross-linking on fibroblasts expressing augmented levels ofFas. Fibroblasts were either transfected with plasmids for overexpression of full length or bioengineered Fas receptors or were transduced with a retroviral Fas expression vector. In these cells Fas oligomerization triggered the morphologic changes indicative of apoptosis regardless of whether or not the Fas-signaling domain w...Continue Reading

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