Cited by 51Circadian rhythm and melatoninBioactive Compounds in PlantsAlzheimer's disease research and treatments

Effects of the Clock Modulator Nobiletin on Circadian Rhythms and Pathophysiology in Female Mice of an Alzheimer’s Disease Model

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Kim, Eunju, Nohara, Kazunari, Wirianto, Marvin, Escobedo, Gabriel, Lim, Ji Ye, Morales, Rodrigo, Yoo, Seung-Hee, Chen, Zheng·2021·Biomolecules

Abstract

Alzheimer’s disease (AD) is an age-related neurodegenerative disorder and the most common cause of dementia. Various pathogenic mechanisms have been proposed to contribute to disease progression, and recent research provided evidence linking dysregulated circadian rhythms/sleep and energy metabolism with AD. Previously, we found that the natural compound Nobiletin (NOB) can directly activate circadian cellular oscillators to promote metabolic health in disease models and healthy aging in naturally aged mice. In the current study, using the amyloid-β AD model APP/PS1, we investigated circadian, metabolic and amyloid characteristics of female mice and the effects of NOB. Female APP/PS1 mice showed reduced sleep bout duration, and NOB treatment exhibited a trend to improve it. While glucose tolerance was unchanged, female APP/PS1 mice displayed exaggerated oxygen consumption and CO2 production, which was mitigated by NOB. Likewise, cold tolerance in APP/PS1 was impaired relative to WT, and interestingly was markedly enhanced in NOB-treated APP/PS1 mice. Although circadian behavioral rhythms were largely unchanged, real-time qPCR analysis revealed altered expression of several core clock genes by NOB in the cerebral cortex, notably Bmal1, Npas2, and Rora. Moreover, NOB was also able to activate various clock-controlled metabolic genes involved in insulin signaling and mitochondrial function, including Igf1, Glut1, Insr, Irs1, Ucp2, and Ucp4. Finally, we observed that NOB attenuated the expression of several AD related genes including App, Bace1, and ApoE, reduced APP protein levels, and strongly ameliorated Aβ pathology in the cortex. Collectively, these results reveal novel genotype differences and importantly beneficial effects of a natural clock-enhancing compound in biological rhythms and related pathophysiology, suggesting the circadian clock as a modifiable target for AD.

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  • Directly improving circadian rhythms activates various clock-controlled metabolic genes involved in insulin signalling and mitochondrial function and ameliorates Aβ pathology.

    “directly improving circadian rhythms activates various clock-controlled metabolic genes involved in insulin signalling and mitochondrial function and ameliorates Aβ pathology.493”

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Authors
Kim, E., Nohara, K., Wirianto, M., Escobedo, G., Lim, J. Y., Morales, R., Yoo, S.-H., & Chen, Z.
Affiliations
  • The University of Texas Health Science Center at Houston (US)
  • Universidad Bernardo O'Higgins (CL)
Corresponding author
Chen, Zheng
Venue
Biomolecules
Publisher
MDPI AG
Published
2021-07-09
Volume
11
Issue
7
Pages
1004
ISSN
2218-273X (ISSN-L)
OpenAlex
W3177695319
Cited by
51
References
81
Citations by year
2026: 8 · 2025: 8 · 2024: 9 · 2023: 14 · 2022: 12
FWCI
4.60
Type
journal article
Language
en
Open access
Locations
  • Biomolecules (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
National Institute on Aging (RF1AG061901)
Topics
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Bioactive Compounds in Plants
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
Keywords
nobiletin, Alzheimer's disease, circadian rhythm, clock genes, APP/PS1 mice, amyloid-beta pathology, sleep bout duration, oxygen consumption, cold tolerance, insulin signaling, mitochondrial function, Bmal1, NPAS2, RORA, sex differences, natural compounds, cerebral cortex
MeSH terms
Alzheimer Disease, Animals, Circadian Rhythm, Disease Models, Animal, Female, Gene Expression Regulation, Flavones, Mice

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