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Long-Term Intranasal Insulin Aspart: A Profile of Gene Expression, Memory, and Insulin Receptors in Aged F344 Rats.
- Source :
-
The journals of gerontology. Series A, Biological sciences and medical sciences [J Gerontol A Biol Sci Med Sci] 2020 May 22; Vol. 75 (6), pp. 1021-1030. - Publication Year :
- 2020
-
Abstract
- Intranasal insulin is a safe and effective method for ameliorating memory deficits associated with pathological brain aging. However, the impact of different formulations and the duration of treatment on insulin's efficacy and the cellular processes targeted by the treatment remain unclear. Here, we tested whether intranasal insulin aspart, a short-acting insulin formulation, could alleviate memory decline associated with aging and whether long-term treatment affected regulation of insulin receptors and other potential targets. Outcome variables included measures of spatial learning and memory, autoradiography and immunohistochemistry of the insulin receptor, and hippocampal microarray analyses. Aged Fischer 344 rats receiving long-term (3 months) intranasal insulin did not show significant memory enhancement on the Morris water maze task. Autoradiography results showed that long-term treatment reduced insulin binding in the thalamus but not the hippocampus. Results from hippocampal immunofluorescence revealed age-related decreases in insulin immunoreactivity that were partially offset by intranasal administration. Microarray analyses highlighted numerous insulin-sensitive genes, suggesting insulin aspart was able to enter the brain and alter hippocampal RNA expression patterns including those associated with tumor suppression. Our work provides insights into potential mechanisms of intranasal insulin and insulin resistance, and highlights the importance of treatment duration and the brain regions targeted.<br /> (© The Author(s) 2019. Published by Oxford University Press on behalf of The Gerontological Society of America. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.)
- Subjects :
- Administration, Intranasal
Animals
Gene Expression
Hippocampus metabolism
Insulin Aspart genetics
Insulin Aspart pharmacology
Male
Maze Learning
Models, Animal
Rats
Rats, Inbred F344
Aging physiology
Insulin Aspart administration & dosage
Memory Disorders drug therapy
Receptor, Insulin metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 1758-535X
- Volume :
- 75
- Issue :
- 6
- Database :
- MEDLINE
- Journal :
- The journals of gerontology. Series A, Biological sciences and medical sciences
- Publication Type :
- Academic Journal
- Accession number :
- 31180116
- Full Text :
- https://doi.org/10.1093/gerona/glz105