IL17A and psoriasis: Oral administration of Lactobacillus pentosus GMNL-77 significantly decreased the interleukin (IL)-23/IL-17A axis–associated cytokines and erythematous scaling lesions in the skin of IMQ-treated mice, suggesting that artificial alteration of the gut microbiota might be relevant for reducing the systemic inflammatory response in the skin of psoriasis patients (Chen et al., 2017).