{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,2]],"date-time":"2026-06-02T12:13:49Z","timestamp":1780402429569,"version":"3.54.1"},"reference-count":52,"publisher":"MDPI AG","issue":"11","license":[{"start":{"date-parts":[[2023,5,31]],"date-time":"2023-05-31T00:00:00Z","timestamp":1685491200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Yamada Bee Company, Inc."}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Nutrients"],"abstract":"<jats:p>Royal jelly (RJ) is a naturally occurring substance synthesized by honeybees and has various health benefits. Herein, we focused on the medium-chain fatty acids (MCFAs) unique to RJ and evaluated their therapeutic efficacy in treating non-alcoholic fatty liver disease (NAFLD). We examined db\/m mice that were exclusively fed a normal diet, db\/db mice exclusively fed a normal diet, and db\/db mice fed varying RJ quantities (0.2, 1, and 5%). RJ improved NAFLD activity scores and decreased gene expression related to fatty acid metabolism, fibrosis, and inflammation in the liver. RJ regulated innate immunity-related inflammatory responses in the small intestine and decreased the expression of genes associated with inflammation and nutrient absorption transporters. RJ increased the number of operational taxonomic units, the abundance of Bacteroides, and seven taxa, including bacteria that produce short-chain fatty acids. RJ increased the concentrations of RJ-related MCFAs (10-hidroxy-2-decenoic acid, 10-hydroxydecanoic acid, 2-decenedioic acid, and sebacic acid) in the serum and liver. These RJ-related MCFAs decreased saturated fatty acid deposition in HepG2 cells and decreased the gene expression associated with fibrosis and fatty acid metabolism. RJ and RJ-related MCFAs improved dysbiosis and regulated the expression of inflammation-, fibrosis-, and nutrient absorption transporter-related genes, thereby preventing NAFLD.<\/jats:p>","DOI":"10.3390\/nu15112580","type":"journal-article","created":{"date-parts":[[2023,6,1]],"date-time":"2023-06-01T02:12:45Z","timestamp":1685585565000},"page":"2580","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Effects of Royal Jelly on Gut Dysbiosis and NAFLD in db\/db Mice"],"prefix":"10.3390","volume":"15","author":[{"given":"Genki","family":"Kobayashi","sequence":"first","affiliation":[{"name":"Department of Endocrinology and Metabolism, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7269-1697","authenticated-orcid":false,"given":"Takuro","family":"Okamura","sequence":"additional","affiliation":[{"name":"Department of Endocrinology and Metabolism, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Saori","family":"Majima","sequence":"additional","affiliation":[{"name":"Department of Endocrinology and Metabolism, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takafumi","family":"Senmaru","sequence":"additional","affiliation":[{"name":"Department of Endocrinology and Metabolism, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1707-970X","authenticated-orcid":false,"given":"Hiroshi","family":"Okada","sequence":"additional","affiliation":[{"name":"Department of Endocrinology and Metabolism, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1031-4380","authenticated-orcid":false,"given":"Emi","family":"Ushigome","sequence":"additional","affiliation":[{"name":"Department of Endocrinology and Metabolism, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Naoko","family":"Nakanishi","sequence":"additional","affiliation":[{"name":"Department of Endocrinology and Metabolism, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4522-8717","authenticated-orcid":false,"given":"Yuichiro","family":"Nishimoto","sequence":"additional","affiliation":[{"name":"Metabologenomics Inc., Tsuruoka 997-0052, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takuji","family":"Yamada","sequence":"additional","affiliation":[{"name":"Metabologenomics Inc., Tsuruoka 997-0052, Japan"},{"name":"Department of Life Science and Technology, Tokyo Institute of Technology, Tokyo 152-8550, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2904-4640","authenticated-orcid":false,"given":"Hideto","family":"Okamoto","sequence":"additional","affiliation":[{"name":"Institute for Health Science, R&D Department, Yamada Bee Company, Inc., Okayama 708-393, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2997-7291","authenticated-orcid":false,"given":"Nobuaki","family":"Okumura","sequence":"additional","affiliation":[{"name":"Institute for Health Science, R&D Department, Yamada Bee Company, Inc., Okayama 708-393, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ryoichi","family":"Sasano","sequence":"additional","affiliation":[{"name":"AiSTI SCIENCE Co., Ltd., Wakayama 640-0033, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8651-4445","authenticated-orcid":false,"given":"Masahide","family":"Hamaguchi","sequence":"additional","affiliation":[{"name":"Department of Endocrinology and Metabolism, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0903-1797","authenticated-orcid":false,"given":"Michiaki","family":"Fukui","sequence":"additional","affiliation":[{"name":"Department of Endocrinology and Metabolism, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,5,31]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"328","DOI":"10.1002\/hep.29367","article-title":"The Diagnosis and Management of Nonalcoholic Fatty Liver Disease: Practice Guidance from the American Association for the Study of Liver Diseases","volume":"67","author":"Chalasani","year":"2018","journal-title":"Hepatology"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Yoshimura, Y., Hamaguchi, M., Hashimoto, Y., Okamura, T., Nakanishi, N., Obora, A., Kojima, T., and 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