This work has been retracted.
RETRACTED: Ultraviolet B radiation‐induced apoptosis in human keratinocytes: cytosolic activation of procaspase‐8 and the role of Bcl‐2
Year: 2003
Type: article
Abstract: In this study, we show that ultraviolet B radiation (UVB)-induced apoptosis of human keratinocytes involves mainly cytosolic signals with mitochondria playing a central role. Overexpression of Bcl-2 inhibited UVB-induced apoptosis by blocking the early generation of reactive oxygen species, mitochondrial cardiolipin degradation and cytochrome c release, without affecting Fas ligand (FasL)-induced cell death. It also prevented the subsequent activation of procaspase-3 and -8 as well as Bid cleavage in UVB-treated cells. Comparative analysis of UVB and FasL death pathways revealed a differential role and mechanism of caspase activation, with the UVB-induced activation of procaspase-8 only being a bystander cytosolic event rather than a major initiator mechanism, as is the case for the FasL-induced cell death. Our results suggest that Bcl-2 overexpression, by preventing reactive oxygen species production, helps indirectly to maintain the integrity of lysosomal membranes, and therefore inhibits the release of cathepsins, which contribute to the cytosolic activation of procaspase-8 in UVB-irradiated keratinocytes.
Source: FEBS Letters
Authors: Zerihun Assefa, Marjan Garmyn, Annelies Vantieghem, Wim Declercq, Peter Vandenabeele, Jackie R Vandenheede, Patrizia Agostinis
Language: English
Subfield: Molecular Biology
Domain: Life Sciences
Open Access status: bronze
OpenAlex ID: W2073960328