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Nrf2 Promotes Keratinocyte Proliferation in Psoriasis through Up-Regulation of Keratin 6, Keratin 16, and Keratin 17.

J. Invest. Dermatol.2017 Oct;137(10):2168-2176. Epub 2017 May 30
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摘要


Psoriasis is a chronic inflammatory skin disease characterized by keratinocyte hyperproliferation of epidermis. Although hyperproliferation-associated keratins K6, K16, and K17 are considered to be the hallmarks of psoriasis, the molecular basis underlying the overexpression of these keratins remains unclear. Nrf2 regulates cell proliferation. Therefore, we investigated whether Nrf2 regulates keratinocyte proliferation via promoting expression of K6, K16, and K17 in psoriasis. We initially found that psoriatic epidermis exhibited elevated expression of Nrf2. Furthermore, Nrf2 promoted expression of K6, K16, and K17 in both HaCaT cells and primary human keratinocytes by binding to the ARE domains located in the promoter of these genes. Additionally, upon stimulation with IL-17 or IL-22, Nrf2 translocated to the nucleus and initiated expression of targeted keratins. In mice of imiquimod-induced psoriasis-like dermatitis, topical application of Nrf2 small interfering RNA alleviated the epidermal hyperplasia with reduced expression of these keratins. More importantly, Nrf2 promoted the proliferation of human keratinocytes through up-regulation of K6, K16, or K17. These data suggested that inflammatory cytokines promoted Nrf2 nuclear translocation in psoriatic epidermis, which led to elevated expression of K6, K16, and K17, thus promoting keratinocyte proliferation and contributing to the pathogenesis of psoriasis.

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