Acral Peeling in Nagashima Type Palmo‐plantar Keratosis Patients Reveals the Role of Serine Protease Inhibitor B 7 in Keratinocyte Adhesion

xlomafota13 shared this article with you from Inoreader Acral Peeling in Nagashima Type Palmo‐plantar Keratosis Patients Reveals the Role of Serine Protease Inhibitor B 7 in Keratinocyte Adhesion Via Experimental Dermatology Abstract Acral peeling skin syndrome (APSS) is a heterogenous group of genodermatoses, manifested by peeling of palmo-plantar skin, occasionally associated with erythema and epidermal thickening. A subset of APSS is caused by mutations in protease inhibitor encoding genes, resulting in unopposed protease activity and desmosomal degradation and/or mis-localization, leading to enhanced epidermal desquamation. We investigated two Arab-Muslim siblings with mild keratoderma and prominent APSS since infancy. Genetic analysis disclosed a homozygous mutation in SERPINB7, c.796C>T, which is the founder mutation in Nagashima type palmo-plantar keratosis (NPPK). Although not previously formally reported, APSS was found in other patients with NPPK. We hypothesized that loss of SERPINB7 function might contribute to the peeling phenotype through impairment of keratinocyte adhesion, similar to other protease inhibitor mutations that cause APSS. Mis-localization of desmosomal components was obse rved in a patient plantar biopsy compared to a biopsy from an age and gender matched healthy control. Silencing of SERPINB7 in normal human epidermal keratinocytes led to increased cell sheet fragmentation upon mechanical stress. Immunostaining showed reduced expression of Desmoglein 1 and Desmocollin 1. This study shows that in addition to stratum corneum perturbation, loss of SERPINB7 disrupts desmosomal components, which could lead to desquamation, manifested by skin peeling. View on the web Inoreader. Take back control of your news feed. Follow us on Twitter and Facebook.