Immune response and inflammation were suggested to play certain roles in the development and complications of type 2 diabetes mellitus. The main objective of this study was to investigate the CD26 expression and its relationship with adenosine deaminase (ADA), dipeptidyl peptidase IV (DPP-IV), γ-glutamyltransferase (GGT), and N-acetyl-β-glucosaminidase (NAG) activities in lymphocytes of type 2 diabetics (T2DM) patients. These parameters were assessed in 25 T2DM patients and 20 control subjects. We observed a decrease in CD26 expression and a significant increase in the ADA activity in T2DM patients when compared with control subjects. There were no differences between activities of DPP-IV, NAG, and GGT in lymphocytes of T2DM patients and control subjects. Meanwhile, a significant negative correlation was observed between CD26 expression and DPP-IV activity in lymphocytes of T2DM patients. Moreover, a positive correlation was found between DPPIV and ADA activities. The results suggest that the reduction of CD26 expression may be associated in the regulation of DPP-IV in T2DM patients.
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