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Intranasal Insulin Reduces Olfactory Sensitivity in Normosmic Humans
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Neuroscience, Functional Pharmacology.ORCID iD: 000-0002-8911-4068
2013 (English)In: Journal of Clinical Endocrinology and Metabolism, ISSN 0021-972X, E-ISSN 1945-7197, Vol. 98, no 10, E1626-E1630 p.Article in journal (Refereed) Published
Abstract [en]

Context: High densities of insulin receptors are found throughout the human brain, including the olfactory bulb, an essential brain area for odor processing. This brain region is the phylogenetically oldest part of the olfactory central nervous system. Objective: We hypothesized that enhanced brain insulin signaling would modulate olfactory processing in humans. Design: We applied a double-blind, placebo-controlled, balanced within-subject design. Setting: This study was conducted in the research unit of a university hospital. Interventions/Participants/Main Outcome Measures: A single dose of either insulin (40 IU) or placebo was intranasally administered to 17 normal-weight normosmic participants (7 women). Subjects' olfactory abilities were examined by means of an olfactory threshold test (odorant n-butanol) and an olfactory discrimination test. In addition, circulating concentrations of glucose, insulin, and cortisol levels were measured. Results: After intranasal insulin administration, subjects' sensitivity for the odorant n-butanol was significantly decreased compared with that for the placebo condition (-13%; P = .025), whereas olfactory discrimination ability was not (P = .841). While serum insulin and serum cortisol were not altered after intranasal insulin administration, there was a small but significant drop in plasma glucose levels. Importantly, a correlational analysis demonstrated that this treatment-induced drop in plasma glucose was not related to the effects of intranasal insulin on olfactory sensitivity. Conclusions: These findings suggest that intranasal insulin impairs olfactory sensitivity for a non-food odorant, whereas no such effects were found for olfactory discrimination. Thus, variations in brain insulin signaling most likely have implications for the olfactory threshold of normosmic humans. Bearing in mind the fact that insulin acts as an anorexigenic signal in the human brain, further studies are needed to test whether intranasal insulin also impairs the ability of humans to perceive food-related odors.

Place, publisher, year, edition, pages
2013. Vol. 98, no 10, E1626-E1630 p.
National Category
Medical and Health Sciences
URN: urn:nbn:se:uu:diva-210208DOI: 10.1210/jc.2013-2061ISI: 000325365900008OAI: oai:DiVA.org:uu-210208DiVA: diva2:661454
Available from: 2013-11-04 Created: 2013-11-04 Last updated: 2015-02-23Bibliographically approved

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Benedict, Christian
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