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Open Access Green as soon as Postprint is submitted to ZB.
Role of γ-aminobutyric acid signalling in the attenuation of counter-regulatory hormonal responses after antecedent hypoglycaemia in healthy men.
Diabetes Obes. Metab. 16, 1274-1278 (2014)
The attenuated counter-regulatory response to hypoglycaemia after antecedent hypoglycaemic episodes has been observed in animals to be associated with an increase in γ-aminobutyric acid (GABA) signalling. We therefore tested the hypothesis that the pharmacological suppression of GABAergic activity during a repeated hypoglycaemic episode enhances counter-regulatory responses. Fourteen healthy men participated in two experimental sessions each comprising three insulin-induced hypoglycaemic episodes. Before the third hypoglycaemic episode, participants received the GABA-antagonistic drug modafinil (200 mg orally) and placebo, respectively. In the placebo condition, the secretion of norepinephrine, adrenocorticotropic hormone, cortisol and growth hormone, and the perception of neuroglycopenic symptoms were attenuated during the third as compared with the first hypoglycaemic episode (each p < 0.05). Modafinil reversed this effect for the noradrenergic response (p < 0.05), while not significantly altering the attenuation of other hormonal responses and symptom perception (p > 0.3). Our findings indicate that increased GABAergic transmission could contribute to aspects of the attenuated counter-regulatory response after recurrent hypoglycaemia in humans.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
Diabetes Complications ; Diabetes Mellitus ; Glucose Metabolism ; Neuropharmacology
ISSN (print) / ISBN
1462-8902
e-ISSN
1463-1326
Journal
Diabetes, Obesity and Metabolism
Quellenangaben
Volume: 16,
Issue: 12,
Pages: 1274-1278
Publisher
Wiley
Reviewing status
Peer reviewed