Late cornified envelope protein 3A

Also known as: Late envelope protein 13, LCE3A, Q5TA76

Late cornified envelope protein 3A (LCE3A) is a structural component of the cornified envelope, a specialized protein-lipid matrix that forms the outermost barrier of the stratum corneum. Its primary mechanism involves cross-linking with other envelope proteins (e.g., involucrin, loricrin) via transglutaminase activity, contributing to mechanical resilience and barrier integrity. Additionally, LCE3A is implicated in innate cutaneous host defense, potentially through direct antimicrobial activity or by modulating the skin's response to microbial challenge, though the precise molecular pathways remain undefined. As an experimental protein with no indexed PubMed references, current knowledge is derived from genomic and transcriptomic studies. LCE3A expression is upregulated in response to epidermal barrier disruption and inflammatory stimuli, such as in psoriasis lesions, suggesting a role in wound healing and epidermal remodeling. Its gene is part of the LCE gene cluster on chromosome 1q21, which is associated with psoriasis susceptibility, though functional validation of LCE3A-specific contributions is lacking. Clinical relevance is speculative at this stage. Given its involvement in barrier function and innate immunity, LCE3A may represent a target for therapies aimed at restoring epidermal integrity in conditions like atopic dermatitis or psoriasis. However, without direct experimental evidence or clinical trials, its therapeutic potential remains unsubstantiated. For research purposes only — not medical advice.

Key data

Mechanism of action

A structural component of the cornified envelope of the stratum corneum involved in innate cutaneous host defense (Probable). Possesses defensin-like antimicrobial activity against a broad spectrum of Gram-positive and Gram-negative bacteria, both aerobic and anaerobic species. Upon inflammation, may regulate skin barrier repair by shaping cutaneous microbiota composition and immune response to bacterial antigens (PubMed:28634035)

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