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Imperial College School of Medicine Endocrine Unit, Hammersmith Hospital, London, United Kingdom W12 0NN
Address all correspondence and requests for reprints to: Prof. S. R. Bloom, ICSM Endocrine Unit, Hammersmith Hospital, Du Cane Road, London, United Kingdom W12 0HS. E-mail: sbloom{at}rpms.ac.uk
Central nervous system glucagon-like peptide-1-(736) amide (GLP-1) administration has been reported to acutely reduce food intake in the rat. We here report that repeated intracerebroventricular (icv) injection of GLP-1 or the GLP-1 receptor antagonist, exendin-(939), affects food intake and body weight. Daily icv injection of 3 nmol GLP-1 to schedule-fed rats for 6 days caused a reduction in food intake and a decrease in body weight of 16 ± 5 g (P < 0.02 compared with saline-injected controls). Daily icv administration of 30 nmol exendin-(939) to schedule-fed rats for 3 days caused an increase in food intake and increased body weight by 7 ± 2 g (P < 0.02 compared with saline-injected controls). Twice daily icv injections of 30 nmol exendin-(939) with 2.4 nmol neuropeptide Y to ad libitum-fed rats for 8 days increased food intake and increased body weight by 28 ± 4 g compared with 14 ± 3 g in neuropeptide Y-injected controls (P < 0.02). There was no evidence of tachyphylaxis in response to icv GLP-1 or exendin-(939). GLP-1 may thus be involved in the regulation of body weight in the rat.
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