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  • Title: Cholinergic muscarinic receptor blockade with pirenzepine abolishes slow wave sleep-related growth hormone release in young patients with insulin-dependent diabetes mellitus.
    Author: Page MD, Koppeschaar HP, Dieguez C, Gibbs JT, Hall R, Peters JR, Scanlon MF.
    Journal: Clin Endocrinol (Oxf); 1987 Mar; 26(3):355-9. PubMed ID: 3652479.
    Abstract:
    Cholinergic receptor blockade has been shown to abolish GH secretion in a variety of physiological and pharmacological situations in normal subjects. We have investigated the effect of pirenzepine on nocturnal GH secretion in young adult patients with Type I insulin-dependent diabetes mellitus. Five patients (three male, two female; aged 20-27 years) were studied in a randomized order on two days separated by at least 1 week. All patients showed episodes of slow wave sleep on each occasion and this was followed by peaks of GH release when placebo alone was administered (range of GH peaks 6-115 mU/l). In contrast, cholinergic muscarinic receptor blockade with pirenzepine (100 mg orally at 2200 and 2400 h) completely abolished nocturnal GH release in each individual without altering the occurrence of slow wave sleep itself. Mean plasma glucose levels at each sampling time between each study did not differ significantly. The ability to abolish nocturnal GH secretion may be important in the field of diabetes, since excess GH secretion is implicated in several acute metabolic and chronic microvascular complications of the disease.
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