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Comparable Sensitivity of Postmenopausal and Young Women to the Effects of Intranasal Insulin on Food Intake and Working Memory
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Neuroscience.ORCID iD: 000-0002-8911-4068
2010 (English)In: Journal of Clinical Endocrinology and Metabolism, ISSN 0021-972X, E-ISSN 1945-7197, Vol. 95, no 12, E468-E472 p.Article in journal (Refereed) Published
Abstract [en]

Context

We have previously shown that enhancing brain insulin signaling by intranasal administration of a single dose of the hormone acutely reduces food intake in young men but not women, whereas its improving effects on spatial and working memory are restricted to young women.

Objective

Against the background of animal studies suggesting that low estrogen concentrations are a prerequisite for the anorexigenic impact of central nervous insulin, we extended our foregoing study by assessing intranasal insulin effects in postmenopausal women with comparatively low estrogen concentrations, expecting them to be more sensitive than young women to the anorexigenic effects of the hormone.

Design, Setting, Participants, and Intervention

In a within-subject, double-blind comparison performed at the University of Lubeck, 14 healthy postmenopausal women (body mass index, 23.71 +/- 0.6 kg/m(2); age, 57.61 +/- 1.14 yr) were intranasally administered 160 IU regular human insulin or vehicle.

Main Outcome Measures

Subjects performed a working memory task (digit span) and a hippocampus-dependent visuospatial memory task. Subsequently, free-choice food intake from an ad libitum breakfast buffet was measured.

Results

Contrary to expectations, results in postmenopausal women mirrored those found in young women(22.44 +/- 0.63 yr), i.e. insulin administration did not affect food intake (P > 0.46), but did enhance performance in the prefrontal cortex-dependent working memory task (P < 0.05).

Conclusions

Low estrogen levels as present in postmenopausal women do not modulate the effects of intranasal insulin in females, suggesting that in humans as opposed to rats, estrogen signaling does not critically alter central nervous system sensitivity to the effects of insulin on energy homeostasis and cognition.

Intranasal insulin has comparable effects in postmenopausal and young women, indicating that estrogen does not critically alter central nervous system insulin sensitivity in women.

Place, publisher, year, edition, pages
2010. Vol. 95, no 12, E468-E472 p.
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:uu:diva-140039DOI: 10.1210/jc.2010-0744ISI: 000284939800010PubMedID: 20719831OAI: oai:DiVA.org:uu-140039DiVA: diva2:382837
Available from: 2011-01-03 Created: 2011-01-03 Last updated: 2017-12-11Bibliographically approved

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