Background: Altered meal-associated secretion of gut peptides is key for the metabolic changes and weight-loss observed after Roux-en-Y gastric bypass (RYGB). Parenteral administration of the gut peptide neurotensin (NT) reduces food intake in rodents, and, like glucagon-like peptide-1 and peptide YY, the secretion of NT is markedly increased after RYGB. We therefore investigated the effect of intravenous (IV) NT on ad libitum food intake and appetite sensations.
Design: Using a double-blinded, randomized placebo-controlled design, NT (2.5pmol/kg/min) or saline was infused IV in healthy young men to obtain NT concentrations similar to NT levels observed postprandially after RYGB. Four visits were performed in random order, after an acclimatization visit, to evaluate the main outcomes - ad libitum food intake and appetite sensations (visual analogue scale (VAS) questionnaires). Blood samples were collected for plasma and serum analyses (including entero-pancreatic peptides and glucose). NT or saline was infused after a basal period (t= -60 to 0 min). On two study days (n=18), an ad libitum meal was served after one hour of infusion (t= 60 min) followed by blood sampling/VAS until t= 120 min (infusion discontinued). On two other study days (n=16), a liquid mixed meal was ingested after one hour of infusion (t = 60 min) followed by blood sampling and VAS until an ad libitum meal was served at t= 240 min (infusion discontinued at t=270min).
Results: Food intake was similar on the ad libitum meal (t = 60 min) days - NT (4150 (3607-4696)kJ, mean (95% confidence interval) vs. saline (3820 (3250-4405) kJ, P=0.062 (paired t-test)) and on the LMM + ad libitum meal (t= 240 min) days - NT (4320 (3698-5008)kJ vs. saline (4250 (3739-4870)kJ, P=0.80). NT infusions did not influence appetite sensations or elicit gastrointestinal side effects.
Conclusions: Despite obtaining NT concentrations similar to what is observed postprandially after RYGB, we did not observe any differences in appetite sensations or food intake.
S. Veedfald: None. C. Martinussen: None. M.S. Svane: None. T. Justinussen: None. M.G. Hindsø: None. N. Hedbäck: None. C.B. Christiansen: None. N.J. Wewer Albrechtsen: Research Support; Self; Mercodia, Novo Nordisk A/S, Novo Nordisk Foundation. Speaker’s Bureau; Self; Merck Sharp & Dohme Corp. K.N. Bojsen-Moller: None. B. Hartmann: None. M. Fenger: None. J.F. Rehfeld: None. S. Madsbad: Advisory Panel; Self; AstraZeneca, Boehringer Ingelheim Pharmaceuticals, Inc., Merck Sharp & Dohme Corp., Novo Nordisk A/S, Sanofi-Aventis. Research Support; Self; Boehringer Ingelheim International GmbH, Novo Nordisk A/S. Speaker’s Bureau; Self; AstraZeneca, Boehringer Ingelheim International GmbH, Novo Nordisk A/S. J.J. Holst: Advisory Panel; Self; AstraZeneca, Merck Sharp & Dohme Corp., Novo Nordisk A/S, Zealand Pharma A/S. Other Relationship; Spouse/Partner; Antag Therapeutics.
Desirée og Niels Ydes Fond; Læge Sophus og hustru Olga Friis Legat; Beckett Fonden; Hørslev Fonden; Aase og Ejnar Danielsens Fond; Fabrikant Frands Køhler Nielsen og hustrus legat; Carl og Ellen Hertz’ Legat