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Investigating the Role of the Hypothalamus in Outcomes to Repetitive Mild Traumatic Brain Injury: Neonatal Monosodium Glutamate Does Not Exacerbate Deficits
Stockholm University, Faculty of Social Sciences, Stress Research Institute. The University of Calgary, Canada.
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Number of Authors: 62019 (English)In: Neuroscience, ISSN 0306-4522, E-ISSN 1873-7544, Vol. 413, p. 264-278Article in journal (Refereed) Published
Abstract [en]

Repetitive mild traumatic brain injury (RmTBI) is a prevalent and costly head injury particularly among adolescents. These injuries may result in long-term consequences, especially during this critical period of development. Insomnia and sleeping difficulties are frequently reported following RmTBI and greatly impair recovery. We sought to develop an animal model of exacerbated deficits following RmTBI by disrupting the hypothalamic circadian system. To accomplish this, we conducted RmTBI on adolescent rats that had received neonatal injections of monosodium glutamate (MSG), a known hypothalamic neurotoxin. We then examined behavioral, circadian, and epigenetic changes. MSG treated rats showed lower anxiety-like behaviors and displayed poor short-term working memory. We also showed changes in the morphology of the circadian clock in the suprachiasmatic nucleus (SCN) vasoactive intestinal polypeptide (VIP) immunostaining. VIP optical density in the SCN increased with MSG but decreased with RmTBI. There were changes in the expression of the clock genes and upregulation of the orexin receptors in response to RmTBI. MSG treated rats had longer telomere lengths than controls. Finally, although both MSG and RmTBI alone produced attenuated circadian amplitudes of activity and body temperature, exacerbated deficits were not identified in animals that received MSG and RmTBI. In sum, both MSG and RmTBI can alter behavior, circadian rhythm amplitude, SCN morphology, and gene expression independently, but the effects do not appear to be additive. Specific damage in the hypothalamus and SCN should be considered when patients experience sleeping problems following RmTBI, as this may improve therapeutic strategies.

Place, publisher, year, edition, pages
2019. Vol. 413, p. 264-278
Keywords [en]
Concussion, Circadian, Behavior, Gene expression, Suprachiasmatic nucleus, Telomere
National Category
Neurosciences
Identifiers
URN: urn:nbn:se:su:diva-171951DOI: 10.1016/j.neuroscience.2019.06.022ISI: 000476866600021PubMedID: 31254543OAI: oai:DiVA.org:su-171951DiVA, id: diva2:1348623
Available from: 2019-09-05 Created: 2019-09-05 Last updated: 2019-09-05Bibliographically approved

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