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- W2080846031 abstract "Psoriasis is a benign, chronic skin disease characterized by keratinocyte hyperproliferation and abnormal differentiation. Curcumin, a selective phosphorylase kinase inhibitor, is a natural phytochemical present in turmeric. Curcumin has been confirmed to have anti-inflammatory properties as well as the ability to inhibit proliferation and decrease the expression of pro-inflammatory cytokines in psoriatic keratinocytes. However, the pro-apoptotic effect of curcumin in keratinocytes remains unclear. In the present study, we investigated the effect of curcumin on apoptosis induction in TNF-α-treated HaCaT cells. These results show that curcumin exhibited a significant pro-apoptotic effect on HaCaT cells only in the presence of TNF-α and/or TRAIL. The pro-apoptotic effect of curcumin resulted from the increased expression of TRAIL-R1/R2 and the decreased expression of anti-apoptotic proteins. Our results indicate that both curcumin and TNF-α up-regulated the expression of TRAIL-R1/R2. In addition, the expression of anti-apoptotic proteins (IAP1, IAP2, Bcl-X(L)) was up-regulated by TNF-α but suppressed by curcumin in HaCaT cells. Because these proteins are regulated by NF-κB, we examined the role of curcumin in NF-κB activation. As expected, curcumin inhibited TNF-α-induced activation of NF-κB, including NF-κB-P65. Curcumin also inhibited the TNF-α-induced production of IL-6/IL-8 in HaCaT cells. These results imply that curcumin-induced apoptosis of HaCaT cells only occurs when TNF-α or/and TRAIL are present. Therefore, we believe that curcumin is able to reverse the anti-apoptotic function of TNF-α in HaCaT cells and thus expect curcumin to be successful in the treatment of psoriasis." @default.
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- W2080846031 date "2012-06-01" @default.
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- W2080846031 title "Curcumin induces apoptosis in tumor necrosis factor-alpha-treated HaCaT cells" @default.
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- W2080846031 doi "https://doi.org/10.1016/j.intimp.2012.03.025" @default.
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