NF-κB-induced microRNA-31 promotes epidermal hyperplasia by repressing protein phosphatase 6 in psoriasis

Area of Science:

• Dermatology
• Molecular Biology
• Cell Biology

Background:

• Constitutive activation of Nuclear Factor-kappa B (NF-κB) is observed in psoriatic epidermis.
• The precise mechanisms by which activated NF-κB drives keratinocyte hyperproliferation in psoriasis remain incompletely understood.

Purpose of the Study:

• To elucidate the role of NF-κB-induced microRNAs in keratinocyte hyperproliferation during psoriasis.
• To identify specific molecular targets regulated by NF-κB and microRNAs in the context of psoriatic skin.

Main Methods:

• Analysis of NF-κB activation and microRNA expression in psoriatic skin samples and mouse models.
• Investigated the role of microRNA 31 (miR-31) using genetic deficiency models in keratinocytes.
• Identified and validated protein phosphatase 6 (ppp6c) as a direct target of miR-31.

Main Results:

• NF-κB activation induces the transcription of miR-31 in psoriatic skin.
• Genetic deficiency of miR-31 in keratinocytes ameliorates psoriatic phenotypes in mouse models.
• miR-31 directly targets and inhibits ppp6c, a negative regulator of cell cycle progression, leading to enhanced keratinocyte proliferation.

Conclusions:

• The NF-κB-induced miR-31 pathway is a critical driver of epidermal hyperproliferation in psoriasis.
• Targeting the miR-31/ppp6c axis represents a potential therapeutic strategy for psoriasis treatment.