Quercetin Protects Obesity-Induced Hypothalamic Inflammation by Reducing Microglia-Mediated Inflammatory Responses via HO-1 Induction

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 f...

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Veröffentlicht in:Nutrients 2017-06, Vol.9 (7), p.650
Hauptverfasser: Yang, Jihyeon, Kim, Chu-Sook, Tu, Thai Hien, Kim, Min-Seon, Goto, Tsuyoshi, Kawada, Teruo, Choi, Myung-Sook, Park, Taesun, Sung, Mi-Kyung, Yun, Jong Won, Choe, Suck-Young, Lee, Jee Hye, Joe, Yeonsoo, Choi, Hye-Seon, Back, Sung Hoon, Chung, Hun Taeg, Yu, Rina
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container_end_page
container_issue 7
container_start_page 650
container_title Nutrients
container_volume 9
creator Yang, Jihyeon
Kim, Chu-Sook
Tu, Thai Hien
Kim, Min-Seon
Goto, Tsuyoshi
Kawada, Teruo
Choi, Myung-Sook
Park, Taesun
Sung, Mi-Kyung
Yun, Jong Won
Choe, Suck-Young
Lee, Jee Hye
Joe, Yeonsoo
Choi, Hye-Seon
Back, Sung Hoon
Chung, Hun Taeg
Yu, Rina
description 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.
doi_str_mv 10.3390/nu9070650
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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. 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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.</abstract><cop>Switzerland</cop><pub>MDPI AG</pub><pmid>28644409</pmid><doi>10.3390/nu9070650</doi><orcidid>https://orcid.org/0000-0002-9752-9407</orcidid><oa>free_for_read</oa></addata></record>
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source MDPI - Multidisciplinary Digital Publishing Institute; MEDLINE; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; PubMed Central; PubMed Central Open Access
subjects animal disease models
Animals
Cell activation
Cell Culture Techniques
Cell Line
Central nervous system
chemokine CCL2
Complications
Conditioning
Culture Media, Conditioned
Diet, High-Fat - adverse effects
Dietary Fats - administration & dosage
Dietary Fats - adverse effects
energy
Energy balance
Gene Expression Regulation - drug effects
Heme
heme oxygenase (biliverdin-producing)
Heme Oxygenase-1 - genetics
Heme Oxygenase-1 - metabolism
High fat diet
Homeostasis
Hypothalamus
Hypothalamus - pathology
IKappaB kinase
Inflammation
Inflammation - chemically induced
Inflammation - drug therapy
Interleukin 6
interleukin-1beta
Macrophages
Male
Membrane Proteins - genetics
Membrane Proteins - metabolism
Metabolism
Mice
Microglia
Microglia - drug effects
Monocyte chemoattractant protein
Monocytes
neurodegenerative diseases
neuroglia
Nitric oxide
Obesity
Obesity - chemically induced
Obesity - complications
Oxidative stress
Oxygenase
palmitates
Palmitic acid
Proteins
Quercetin
Quercetin - pharmacology
Random Allocation
Rodents
saturated fatty acids
title Quercetin Protects Obesity-Induced Hypothalamic Inflammation by Reducing Microglia-Mediated Inflammatory Responses via HO-1 Induction
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