Cited by 114Genetics, Aging, and Longevity in Model OrganismsSirtuins and Resveratrol in MedicineRegulation of Appetite and Obesity

Increased ghrelin signaling prolongs survival in mouse models of human aging through activation of sirtuin1

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Fujitsuka, N, Asakawa, A, Morinaga, A, Amitani, M S, Amitani, H, Katsuura, G, Sawada, Y, Sudo, Y +15 more·2016·Molecular Psychiatry

Abstract

Caloric restriction (CR) is known to retard aging and delay functional decline as well as the onset of diseases in most organisms. Ghrelin is secreted from the stomach in response to CR and regulates energy metabolism. We hypothesized that in CR ghrelin has a role in protecting aging-related diseases. We examined the physiological mechanisms underlying the ghrelin system during the aging process in three mouse strains with different genetic and biochemical backgrounds as animal models of accelerated or normal human aging. The elevated plasma ghrelin concentration was observed in both klotho-deficient and senescence-accelerated mouse prone/8 (SAMP8) mice. Ghrelin treatment failed to stimulate appetite and prolong survival in klotho-deficient mice, suggesting the existence of ghrelin resistance in the process of aging. However, ghrelin antagonist hastened death and ghrelin signaling potentiators rikkunshito and atractylodin ameliorated several age-related diseases with decreased microglial activation in the brain and prolonged survival in klotho-deficient, SAMP8 and aged ICR mice. In vitro experiments, the elevated sirtuin1 (SIRT1) activity and protein expression through the cAMP-CREB pathway was observed after ghrelin and ghrelin potentiator treatment in ghrelin receptor 1a-expressing cells and human umbilical vein endothelial cells. Furthermore, rikkunshito increased hypothalamic SIRT1 activity and SIRT1 protein expression of the heart in the all three mouse models of aging. Pericarditis, myocardial calcification and atrophy of myocardial and muscle fiber were improved by treatment with rikkunshito. Ghrelin signaling may represent one of the mechanisms activated by CR, and potentiating ghrelin signaling may be useful to extend health and lifespan.

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  • Activation of ghrelin signaling attenuates microglial activation in mouse models of normal aging, accelerated aging, and Alzheimer's disease.

    “the activation of ghrelin signaling has been shown to attenuate microglial activation in mouse models of normal aging, accelerated aging and AD.”
  • The neuroprotective effects of ghrelin might be attributed to its ability to impact age-related pathways, including sirtuin-1 activation, and to prolong lifespan in different mouse models of aging.

    “The neuroprotective effects of ghrelin might be attributed to its ability to impact age-related pathways, including sirtuin-1 activation, with studies demonstrating its ability to prolong lifespan in different mouse models of aging.”

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Authors
Fujitsuka, N., Asakawa, A., Morinaga, A., Amitani, M. S., Amitani, H., Katsuura, G., Sawada, Y., Sudo, Y., Uezono, Y., Mochiki, E., Sakata, I., Sakai, T., Hanazaki, K., Yada, T., Yakabi, K., Sakuma, E., Ueki, T., Niijima, A., Nakagawa, K., Okubo, N., Takeda, H., Asaka, M., & Inui, A.
Affiliations
  • Kagoshima University (JP)
  • National Cancer Center Research Institute (JP)
  • Saitama Medical Center, Saitama Medical University (JP)
  • Saitama University (JP)
  • Kochi Medical School Hospital (JP)
  • Jichi Medical University (JP)
  • Nagoya City University (JP)
  • Niigata University (JP)
  • Hokkaido University (JP)
Corresponding author
Inui, A
Venue
Molecular Psychiatry
Published
2016-02-02
Volume
21
Issue
11
Pages
1613-1623
ISSN
  • 1359-4184 (ISSN-L)
  • 1476-5578
OpenAlex
W2277887080
Cited by
114
References
62
Citations by year
2026: 3 · 2025: 9 · 2024: 10 · 2023: 5 · 2022: 9 · 2021: 9 · 2020: 21 · 2019: 11 · 2018: 11 · 2017: 16 · 2016: 10
FWCI
8.62
Type
journal article
Language
en
Open access
Locations
  • Molecular Psychiatry (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
Japan Society for the Promotion of Science (22590676, 25117008, 26462244, 16K10220, 24390182, 15K15277, 15K08686)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Aging › Genetics, Aging, and Longevity in Model Organisms
  • Health Sciences › Medicine › Geriatrics and Gerontology › Sirtuins and Resveratrol in Medicine
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Regulation of Appetite and Obesity
Keywords
ghrelin, caloric restriction, aging, SIRT1, Rikkunshito, atractylodin, ghrelin resistance, SAMP8 mice, microglial activation, hypothalamus, myocardial calcification, pericarditis, lifespan extension, age-related diseases
MeSH terms
Aging, Animals, Disease Models, Animal, Drugs, Chinese Herbal, Hypothalamus, Mice, Inbred ICR, Signal Transduction, Caloric Restriction, Mice, Ghrelin, Receptors, Ghrelin, Sirtuin 1

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