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The role of proteases in stratum corneum: involvement in stratum corneum desquamation.
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The effects of protease inhibitors on cell dissociation were studied in vitro in order to examine the involvement of proteases in stratum corneum desquamation. Stratum corneum sheet (peeled from human backs after sunburn) was incubated in a detergent mixture containing 8 mM N,N-dimethyldodecylamine
Comparative analysis of solar radiation-induced cellular damage between ex vivo porcine skin organ culture and in vitro reconstructed human epidermis.
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Reconstructed human epidermis models (RHE) constitute an innovative alternative to study phototoxicity and photoprotection in the cosmetic industry. However, little information is currently available concerning the harmful effects of solar-simulated radiation (SSR) in these in vitro skin models. In
Induction of cell surface peptidase activity: a global response to cell stress correlated with apoptosis.
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We have previously characterized the stimulation of HeLa cell surface peptidase activity directed toward a nonapeptide substrate in response to low fluences of ultraviolet irradiation [Brown et al. (1993): J Cell Biochem 51:102-115]. To explore the hypothesis that this comprised a global response to
Stimulatory effect of topical application of caffeine on UVB-induced apoptosis in mouse skin.
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In an earlier study, we showed that oral administration of green tea or caffeine to SKH-1 mice for 2 weeks prior to a single application of UVB enhanced UVB-induced increases in the number of p53-positive cells, p21(WAF1/CIP1)-positive cells, and apoptotic sunburn cells in the epidermis. In the
DNA-dependent protein kinase catalytic subunit is cleaved during UV-induced apoptosis.
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Ultraviolet radiation can induce the injury of epidermal keratinocytes, resulting in sunburn cell (apoptotic cell) formation. It has been demonstrated that the protease caspase-3, a downstream molecule of the CD95 pathway, is activated in UV-exposed HaCaT cells, and that the DNA-dependent protein
The NLRP1 Inflammasome in Human Skin and Beyond
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Inflammasomes represent a group of protein complexes that contribute to host defense against pathogens and repair processes upon the induction of inflammation. However, aberrant and chronic inflammasome activation underlies the pathology of numerous common inflammatory diseases. Inflammasome
Caspase-1 activity is required for UVB-induced apoptosis of human keratinocytes.
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Caspase-1 has a crucial role in innate immunity as the protease activates the proinflammatory cytokine prointerleukin(IL)-1β. Furthermore, caspase-1 induces pyroptosis, a lytic form of cell death that supports inflammation. Activation of caspase-1 occurs in multi-protein complexes termed
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