Investigating expression pattern of eight immune‐related genes in pemphigus patients compared with the healthy controls and after rituximab therapy: Potential roles of CTLA4 and FCGR3A genes expression in outcomes of rituximab therapy.

Pemphigus is a rare group of autoimmune diseases, which its exact molecular pathogenesis and therapeutic biomarkers remained unknown. In this regard the expressions of eight immune‐related genes was evalualted in pemphigus patients. Forty‐six pemphigus patients, either new case or on minimal therapy, were recruited. The expressions of IL22, IL9, IL21, EBI3, TNFSF13B, FCGR3A, CTLA4, and PDCD1 genes were analyzed at baseline, compared with 32 healthy controls, and their changes were monitored 3 months after rituximab (RTX) therapy through Reverse Transcriptase Real‐time PCR (RT‐Real‐time PCR). Except of IL21, which was similar in both groups, expressions of other genes were significantly lower in patients compared with the controls (P‐value <.05). PDCD1, EBI3, IL21, and IL22 genes were significantly overexpressed three months following RTX administration (P‐value <.05). Higher prednisolone dosage and PDAI‐score were positively correlated with CTLA4 and FCGR3A expressions after 3 months, respectively (P‐value =.019 and.048, respectively). Anti‐desmoglein 1 (Dsg 1) titer and its positivity at baseline were associated with TNFSF13B expression, FCGR3A expressions, and the PDAI‐score. Our results suggest the possible involvement of some gene expressions in pemphigus immunopathogenesis, which could be affected by RTX therapy and also might be used as prognostic biomarkers. [ABSTRACT FROM AUTHOR]