Leptin Modulates Behavioral Responses to Sweet Substances by Influencing Peripheral Taste Structures
Abstract
Leptin is a hormone that regulates body weight homeostasis mainly via the hypothalamic functional leptin receptor Ob-Rb. Recently, we proposed that the taste organ is a new peripheral target for leptin. Leptin selectively inhibits mouse taste cell responses to sweet substances and thereby may act as a sweet taste modulator. The present study further investigated leptin action on the taste system by examining expression of Ob-Rb in taste cells and behavioral responses to sweet substances in leptin-deficient ob/ob, and Ob-Rb-deficient db/db mice and their normal litter mates. RT-PCR analysis showed that Ob-Rb was expressed in taste cells in all strains tested. The db/db mice, however, had a RT-PCR product containing an abnormal db insertion that leads to an impaired shorter intracellular domain. In situ hybridization analysis showed that the hybridization signals for normal Ob-Rb mRNA were detected in taste cells in lean and ob/ob mice but not in db/db mice. Two different behavioral tests, one using sweet-bitter mixtures as taste stimuli and the other a conditioned taste aversion paradigm, demonstrated that responses to sucrose and saccharin were significantly decreased after ip injection of leptin in ob/ob and normal littermates, but not in db/db mice. These results suggest that leptin suppresses behavioral responses to sweet substances through its action on Ob-Rb in taste cells. Such taste modulation by leptin may be involved in regulation for food intake.
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In rodents, absence of leptin increases and addition of leptin dampens peripheral taste and olfactory sensitivity.
“In rodents, absence of leptin has been shown to increase and addition of leptin to dampen peripheral taste and olfactory sensitivity”
From Food reward, hyperphagia, and obesity (2011) · cites this paper as [157]
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- Authors
- Shigemura, N., Ohta, R., Kusakabe, Y., Miura, H., Hino, A., Koyano, K., Nakashima, K., & Ninomiya, Y.
- Affiliations
- Kyushu University (JP)
- National Agriculture and Food Research Organization (JP)
- Asahi University (JP)
- Corresponding author
- Ninomiya, Yuzo
- Venue
- Endocrinology
- Publisher
- The Endocrine Society
- Published
- 2004-02
- Volume
- 145
- Issue
- 2
- Pages
- 839-847
- ISSN
- 0013-7227 (ISSN-L)
- 1945-7170
- OpenAlex
- W2053252677
- Cited by
- 199
- References
- 28
- Citations by year
- 2026: 5 · 2025: 5 · 2024: 2 · 2023: 4 · 2022: 3 · 2021: 4 · 2020: 8 · 2019: 13 · 2018: 5 · 2017: 24 · 2016: 10 · 2015: 8 · 2014: 9 · 2013: 8 · 2012: 15
- FWCI
- 4.59
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Endocrinology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Japan Society for the Promotion of Science (15209061, 12470394)
- Bio-oriented Technology Research Advancement Institution
- Topics
- Health Sciences › Nursing › Nutrition and Dietetics › Biochemical Analysis and Sensing Techniques
- Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Regulation of Appetite and Obesity
- Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
- Keywords
- leptin, sweet taste, taste cells, Ob-Rb, leptin receptor, taste modulation, conditioned taste aversion, sucrose, saccharin, ob/ob mice, db/db mice, food intake regulation
- MeSH terms
- Animals, Behavior, Animal, Diabetes Mellitus, Female, Male, Mice, Inbred C57BL, Mice, Obese, Receptors, Cell Surface, RNA, Messenger, Saccharin, Sucrose, Taste, Taste Buds, Gene Expression, In Situ Hybridization, Mice, Knockout, Reverse Transcriptase Polymerase Chain Reaction, Leptin, Mice, Receptors, Leptin
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