Basement Membrane Changes in Lichen Planopilaris

June 2009 in “ Journal of the European Academy of Dermatology and Venereology ”

Khitam Al‐Refu, Mark Goodfield

lichen planopilaris cicatricial alopecia basement membrane zone hemidesmosome laminin collagen laminin-5 type IV collagen type VII collagen follicular epithelium dermis scarring alopecia skin biopsy

Studysummary This study found that in lichen planopilaris, the basement membrane zone of the hair follicles exhibited disrupted and discontinuous staining patterns, potentially contributing to scarring and irreversible hair loss. Our plain-language summary of this paper — not a Tressless recommendation.

The study investigated basement membrane zone (BMZ) alterations in lichen planopilaris (LPP), an inflammatory disease causing cicatricial alopecia. Using immunohistochemistry on skin biopsies from 6 LPP patients and 6 controls, researchers found significant differences in the localization and staining of hemidesmosome, laminin, and collagen components in inflamed follicular epithelium compared to uninvolved areas. Hemidesmosome-associated complexes were weak and discontinuous, and the expression of laminin-5, type IV collagen, and type VII collagen was disrupted, with projections into the dermis. These BMZ changes may contribute to abnormal healing and irreversible hair loss in LPP.

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