Quercetin protects obesity-induced hypothalamic inflammation by reducing microglia-mediated inflammatory responses via HO-1 induction

Jihyeon Yang, Chu Sook Kim, Thai Hien Tu, Min Seon Kim, Tsuyoshi Goto, Teruo Kawada, Myung Sook Choi, Taesun Park, Mi Kyung Sung, Jong Won Yun, Suck Young Choe, Jee Hye Lee, Yeonsoo Joe, Hye Seon Choi, Sung Hoon Back, Hun Taeg Chung, Rina Yu

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

Obesity-induced hypothalamic inflammation is characterized by activation of microglia, which are resident macrophages of the central nervous system, and is implicated in the derangement of energy homeostasis, metabolic complications, and neurodegenerative diseases. Quercetin, a naturally occurring flavonoid, is known to protect against oxidative stress and inflammation-related metabolic complications. Here, we demonstrate that quercetin reduces obesity-induced hypothalamic inflammation by inhibiting microglia-mediated inflammatory responses, and the beneficial action of quercetin is associated with heme oxygenase (HO-1) induction. Quercetin markedly reduced the production of inflammatory mediators (monocyte chemoattractant protein (MCP)-1, interleukin (IL-6), IL-1β, nitric oxide) by microglia stimulated with saturated fatty acid palmitate and/or lipid-laden microglia-conditioned medium. Quercetin also upregulated the expression of HO-1 in palmitate-treated lipid-laden microglia, and the actions of quercetin against microglia activation accompanied by IκBα degradation were abolished by a HO-1 inhibitor. Moreover, quercetin supplementation reduced the levels of inflammatory cytokines and microglia activation markers in the hypothalamus of high fat diet (HFD)-fed obese mice, which was accompanied by upregulation of HO-1. These findings indicate that quercetin suppresses microglia-mediated inflammatory responses via the induction of HO-1, and hence protects against obesity-induced hypothalamic inflammation.

Original languageEnglish
Article number650
JournalNutrients
Volume9
Issue number7
DOIs
Publication statusPublished - 2017 Jul

Bibliographical note

Funding Information:
This research was supported by the Bio & Medical Technology Development Program (No. 2012M3A9C3048687) and the SRC program (Center for Food & Nutritional Genomics Research: Grant No. 2015R1A5A6001906) of the National Research Foundation (NRF) funded by the Korean Government (MEST). T.K. and T.G. were supported by the Japan Health Foundation.

All Science Journal Classification (ASJC) codes

  • Food Science
  • Nutrition and Dietetics

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