Open AccessIntranasal insulin increases regional cerebral blood flow in the insular cortex in men independently of cortisol manipulation
Author(s) -
Schilling Thomas M.,
Ferreira de Sá Diana S.,
Westerhausen René,
Strelzyk Florian,
Larra Mauro F.,
Hallschmid Manfred,
Savaskan Egemen,
Oitzl Melly S.,
Busch HansPeter,
Naumann Ewald,
Schächinger Hartmut
Publication year - 2014
Publication title -
human brain mapping
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.005
H-Index - 191
eISSN - 1097-0193
pISSN - 1065-9471
DOI - 10.1002/hbm.22304
Subject(s) - insulin , insular cortex , cerebral blood flow , endocrinology , medicine , hormone , putamen , psychology , hydrocortisone , appetite , neuroscience
Insulin and cortisol play a key role in the regulation of energy homeostasis, appetite, and satiety. Little is known about the action and interaction of both hormones in brain structures controlling food intake and the processing of neurovisceral signals from the gastrointestinal tract. In this study, we assessed the impact of single and combined application of insulin and cortisol on resting regional cerebral blood flow (rCBF) in the insular cortex. After standardized periods of food restriction, 48 male volunteers were randomly assigned to receive either 40 IU intranasal insulin, 30 mg oral cortisol, both, or neither (placebo). Continuous arterial spin labeling (CASL) sequences were acquired before and after pharmacological treatment. We observed a bilateral, locally distinct rCBF increase after insulin administration in the insular cortex and the putamen. Insulin effects on rCBF were present regardless of whether participants had received cortisol or not. Our results indicate that insulin, but not cortisol, affects blood flow in human brain structures involved in the regulation of eating behavior. Hum Brain Mapp 35:1944–1956, 2014 . © 2013 Wiley Periodicals, Inc.