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Third Department of Internal Medicine, Mie University School of Medicine, 2-174 Edobashi, Tsu, Mie 514-8507, Japan. katuki-a@clin.medic.mie-u.ac.jp
OBJECTIVE: To investigate the effect of acute hyperinsulinemia on the plasma levels of adrenomedullin (AM) in patients with type 2 diabetes mellitus. DESIGN: We measured the plasma levels of AM in 18 patients with type 2 diabetes mellitus and in 19 normal subjects before and during a euglycemic hyperinsulinemic clamp study (the goal was for blood sugar levels of 5.24 mmol/l and insulin levels of 1200 pmol/l). Both plasma AM and serum insulin were measured by immunoradiometric assays. RESULTS: Before the glucose clamp study there was no significant difference in the plasma levels of AM between patients with type 2 diabetes mellitus and normal subjects. During the glucose clamp study, the serum levels of insulin significantly increased (from 33.0+/-3.6 to 1344.6+/-67.8 pmol/ml, P<0.001), as did the plasma levels of AM (from 12.8+/-0.7 to 14.2+/-0.9 fmol/ml, P<0.03) only in patients with type 2 diabetes mellitus. There was a significant correlation between the change in circulating levels of insulin and AM (r=0.755, P<0.01). CONCLUSIONS: Acute hyperinsulinemia induced a significant increase in the plasma levels of AM in patients with type 2 diabetes mellitus. Increased insulin may regulate circulating levels of AM in patients with type 2 diabetes mellitus.
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