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Background : In the past, different research groups could show that treatment of immune cells with inhibitors of post-proline splitting dipeptidyl aminopeptidases leads to functional changes in the immune system consistent with immunosuppression. This is due to the inhibition of proliferation of lymphocytes and the production of inflammatory cytokines of the TH 1 , TH 2 , and TH 17  cells as well as the induction of immunosuppressive cytokines, such as transforming growth factor-β1 (TGF-β1) and interleukin (IL)-1RA. Until recently, most of the effects of these inhibitors on immune functions were attributed to the inhibition of dipeptidyl aminopeptidase IV (DPIV/CD26). With the identification of new peptidases of the DPIV family (DASH) with the same or similar substrate specificity [fibroblast activation protein (FAP), DP8/9], the question arose whether and to what extent the inhibition of intracellularly localized enzymes, DP8 and DP9, contribute to the observed immunosuppression. In addition, members of the aminopeptidase N (APN) family are also involved in the regulation of immune functions. Hence, the concept of a combined targeting of both families of peptidases for treatment of inflammatory diseases is a promising strategy.

Recent insights into the role of dipeptidyl aminopeptidase IV (DPIV) and aminopeptidase N (APN) families in immune functions