Abstract

We randomly administered luteinizing hormone-releasing hormone (LHRH) or thyrotropin releasing hormone (TRH) (25 μg and 200 μg, respectively, as a bolus), to 16 diabetic male subjects (9 type I, 7 type II) and to 9 healthy male controls in two different mornings. While GH in the basal state was similar in type I, type II, and normal subjects, LHRH administration surprisingly evoked a significant GH release in 7 (5 type I, 2 type II) diabetic patients. GH-responders had higher glycated hemoglobin than non-responders (11 ± 1 v 8.3 ± 0.5%) but superimposable fasting and intratest average glucose levels. Only one patient among the GH-responders to LHRH showed a GH release also after TRH. These data support the hypothesis that GH secretion in diabetes, especially when poorly controlled, is abnormal.

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