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  • Title: Dipeptidyl peptidase-4 inhibitor sitagliptin improves pancreatic β-cell function in hypertensive diabetic patients treated with angiotensin receptor blockers.
    Author: Fukui K, Kawahito H, Wakana N, Kikai M, Terada K, Yamamoto K, Irie D, Kato T, Miyagawa S, Yamada H.
    Journal: J Renin Angiotensin Aldosterone Syst; 2015 Dec; 16(4):1001-9. PubMed ID: 26195265.
    Abstract:
    INTRODUCTION: Dipeptidyl peptidase (DPP)-4 inhibitors, a novel oral anti-diabetic agents, exert a protective effect on pancreatic β-cell function in patients with type 2 diabetic mellitus (T2DM). However, their beneficial effect in hypertensive T2DM patients treated with angiotensin receptor blockers (ARBs) has not been investigated. METHODS: In this open-label multicenter randomized study, a total of 55 hypertensive T2DM patients treated with ARBs were randomly assigned to receive the DPP-4 inhibitor sitagliptin or sulfonylurea (SU). RESULTS: After 24 weeks of treatment, a significant reduction in fasting blood glucose was only observed in the sitagliptin group, while HbA1c was significantly reduced in both groups. Homeostasis model assessment of insulin resistance was not significantly improved in either group. Indicators of pancreatic β-cell function, including proinsulin to insulin ratio and homeostasis model assessment of β-cell function, were significantly improved in the sitagliptin group, but not in the SU group. The beneficial effects of sitagliptin were observed in hypoglycemic drug naïve patients, but not in patients who had received SU monotherapy prior to the study. CONCLUSION: Treatment with the DPP-4 inhibitor sitagliptin might exert beneficial effects on pancreatic β-cell function in ARB-treated T2DM patients and its efficacy might be more pronounced in hypoglycemic drug naïve patients.
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