PASH Syndrome: Comparing Pathogenic Mechanism of Pyoderma Gangrenosum, Acne and Suppurative Hidradenitis |Biomedgrid

PASH syndrome is a recently described autoinflammatory disease, consisting of pyoderma gangrenosum (PG), acne and hidradenitis suppurativa (HS). We report a new case of PASH syndrome, highlighting the features of the rare condition. For a better understanding of each of the three diseases and of the PASH syndrome, we reviewed the common and the particular aspects of these pathologies, looking from different angles of inflammation mechanisms. Among the approached topics, we discussed about: increased production of interleukin-1 (IL1) and of other cytokines, altered matrix metalloproteinases expression, multiple roles of neutrophils, genetic profiling and inflammatory infiltrates. As far as we know it is the first time we note the similarities and differences of pathways beyond the neutrophils mediated cutaneous manifestations present in PASH, PG, HS and acne. Our findings emphasize that PASH syndrome may be an inspiring lesson for rethinking autoinflammatory, neutrophilic, innate immune skin diseases.