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Published on: May 6, 2013
CD26/DPP4 levels in peripheral blood and T cells in patients with type 2 diabetes mellitus
Sang Ah Lee1, Young Ree Kim, Eun Jin Yang
1Department of Internal Medicine, Jeju National University School of Medicine, Jeju, Republic of Korea 690-756.
Context:
Dipeptidyl peptidase 4 (CD26/DPP4) is expressed on blood T cells and also circulates in a soluble form (sCD26/DPP4).
Objective:
We aimed to evaluate blood T cell and circulating CD26/DPP4 and its association with metabolic parameters in patients with type 2 diabetes mellitus (T2DM).
Designs:
We measured CD26/DPP4 expression (percentage of CD26(+) cells using flow cytometry) on CD4(+) and CD8(+) T cells, serum CD26/DPP4 level and activity, and various metabolic parameters in T2DM patients not on DPP4 inhibitor therapy (n = 148). Nondiabetic subjects (n = 50) were included as a control group.
Results:
Compared with the healthy controls, CD26/DPP4 expression on CD4(+) T cells and CD8(+) T cells was higher in T2DM patients. Serum CD26/DPP4 levels and enzymatic activities were also higher in patients with T2DM than in the control group only when metformin and/or thiazolidinedione-treated T2DM patients were excluded; metformin and/or thiazolidinedione-treated T2DM patients had lower values compared with other T2DM patients. Various parameters in T2DM patients were related to CD26/DPP4 expression on the T cells (hemoglobin A1c), serum sCD26/DPP4 (hemoglobin A1c and insulin resistance assessed by updated homeostasis model assessment), and serum CD26/DPP4 activity (insulin resistance assessed by updated homeostasis model assessment, γ-glutamyl transferase, and alanine aminotransferase) by multivariate analyses. After active glucose control for 12 weeks in drug-naive T2DM patients (n = 50), CD26/DPP4 expression on blood T cells was significantly decreased.
Conclusions:
Our results suggest that the CD26/DPP4 level on blood T cells was associated with glucose control status in patients with T2DM.
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