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Kisipan ML, Ojoo RO, Kanui TI, Abelson KSP. Bodyweight, locomotion, and behavioral responses of the naked mole rat (Heterocephalus glaber) to lipopolysaccharide administration. J Comp Physiol A Neuroethol Sens Neural Behav Physiol 2022; 208:493-504. [PMID: 35731263 PMCID: PMC9250917 DOI: 10.1007/s00359-022-01557-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Accepted: 06/10/2022] [Indexed: 11/26/2022]
Abstract
The naked mole rat has unique biologic characteristics that include atypical inflammatory responses. Lipopolysaccharide induces inflammation which triggers brain centers controlling feeding, and behavior to result in “sick animal behavior”. We characterized the bodyweight, locomotor, and other behavioral responses of this rodent to lipopolysaccharide administration. Lipopolysaccharide caused weight losses, which were not prevented by TAK 242. In the open field test, lipopolysaccharide did not depress locomotion, while urination, defecation, and activity freezing were rare. The animals exhibited walling but not rearing and fast backward movements that were unaffected by lipopolysaccharide. Failure to depress locomotion suggests either a unique immunity-brain crosstalk or motor responses/centers that tolerate depressive effects of inflammation. The absence of activity freezing and rarity of urination and defecation suggests that novel environments or lipopolysaccharide do not induce anxiety, or that anxiety is expressed differently in the animal. The absence of rearing could be due to the design of the animal’s locomotor apparatus while fast backward movement could be a mechanism for quick escape from threats in the tunnels of their habitat. Our results elucidate the unique biology of this rodent, which elicits interest in the animal as a model for inflammatory research, although the findings require mechanistic corroborations.
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Affiliation(s)
- Mosiany Letura Kisipan
- Department of Experimental Medicine, University of Copenhagen, Copenhagen, Denmark.
- Department of Veterinary Anatomy and Physiology, Egerton University, Njoro, Kenya.
| | - Rodi Omondi Ojoo
- Department of Veterinary Anatomy and Physiology, University of Nairobi, Nairobi, Kenya
| | - Titus Ikusya Kanui
- Department of Agricultural Sciences, South Eastern Kenya University, Kitui, Kenya
| | - Klas S P Abelson
- Department of Experimental Medicine, University of Copenhagen, Copenhagen, Denmark
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Liu G, Li J, Pang B, Li Y, Xu F, Liao N, Shao D, Jiang C, Shi J. Potential role of selenium in alleviating obesity-related iron dyshomeostasis. Crit Rev Food Sci Nutr 2022; 63:10032-10046. [PMID: 35574661 DOI: 10.1080/10408398.2022.2074961] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Obesity is a serious health problem in modern life and increases the risk of many comorbidities including iron dyshomeostasis. In contrast to malnourished anemia, obesity-related iron dyshomeostasis is mainly caused by excessive fat accumulation, inflammation, and disordered gut microbiota. In obesity, iron dyshomeostasis also induces disorders associated with gut microbiota, neurodegenerative injury, oxidative damage, and fat accumulation in the liver. Selenium deficiency is often accompanied by obesity or iron deficiency, and selenium supplementation has been shown to alleviate obesity and overcome iron deficiency. Selenium inhibits fat accumulation and exhibits anti-inflammatory activity. It regulates gut microbiota, prevents neurodegenerative injury, alleviates oxidative damage to the body, and ameliorates hepatic fat accumulation. These effects theoretically meet the requirements for the inhibition of factors underlying obesity-related iron dyshomeostasis. Selenium supplementation may have a potential role in the alleviation of obesity-related iron dyshomeostasis. This review verifies this hypothesis in theory. All the currently reported causes and results of obesity-related iron dyshomeostasis are reviewed comprehensively, together with the effects of selenium. The challenges and strategies of selenium supplementation are also discussed. The findings demonstrate the possibility of selenium-containing drugs or functional foods in alleviating obesity-related iron dyshomeostasis.
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Affiliation(s)
- Guanwen Liu
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, Shaanxi, China
| | - Junjun Li
- College of Enology, Northwest A&F University, Yangling, Shaanxi, People's Republic of China
| | - Bing Pang
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, Shaanxi, China
| | - Yinghui Li
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, Shaanxi, China
| | - Fengqin Xu
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, Shaanxi, China
| | - Ning Liao
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, Shaanxi, China
| | - Dongyan Shao
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, Shaanxi, China
| | - Chunmei Jiang
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, Shaanxi, China
| | - Junling Shi
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, Shaanxi, China
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Son HK, Xiang H, Park S, Lee J, Lee JJ, Jung S, Ha JH. Partial Replacement of Dietary Fat with Polyunsaturated Fatty Acids Attenuates the Lipopolysaccharide-Induced Hepatic Inflammation in Sprague-Dawley Rats Fed a High-Fat Diet. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 18:ijerph182010986. [PMID: 34682732 PMCID: PMC8535618 DOI: 10.3390/ijerph182010986] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/21/2021] [Revised: 10/13/2021] [Accepted: 10/16/2021] [Indexed: 12/17/2022]
Abstract
In this study, we investigated whether the partial replacement of dietary fat with polyunsaturated fatty acids (PUFAs) ameliorated the lipopolysaccharide (LPS)-induced hepatic inflammation in rats fed a high-fat diet. Male Sprague-Dawley rats were divided into three groups and provided each of the following diets: (1) high-fat diet (HFD), (2) HFD with perilla oil (PO), and (3) HFD with corn oil (CO). After 12 weeks of dietary intervention, the rats were intraperitoneally injected with LPS (5 mg/kg) from Escherichia coli O55:B5 or phosphate-buffered saline (PBS). Following LPS stimulation, serum insulin levels were increased, while PO and CO lowered the serum levels of glucose and insulin. In the liver, LPS increased the triglyceride levels, while PO and CO alleviated the LPS-induced hepatic triglyceride accumulation. In the LPS injected rats, the mRNA expression of genes related to inflammation and endoplasmic reticulum (ER) stress was attenuated by PO and CO in the liver. Furthermore, hepatic levels of proteins involved in the nuclear factor kappa-light-chain-enhancer of activated B cells/mitogen-activated protein kinase pathways, antioxidant response, and ER stress were lowered by PO- and CO-replacement. Therefore, the partial replacement of dietary fat with PUFAs alleviates LPS-induced hepatic inflammation during HFD consumption, which may decrease metabolic abnormalities.
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Affiliation(s)
- Hee-Kyoung Son
- Research Center for Industrialization of Natural Neutralization, Dankook University, Cheonan 31116, Korea; (H.-K.S.); (H.X.); (S.P.); (J.L.)
| | - Huo Xiang
- Research Center for Industrialization of Natural Neutralization, Dankook University, Cheonan 31116, Korea; (H.-K.S.); (H.X.); (S.P.); (J.L.)
- Department of Food Science and Nutrition, Dankook University, Cheonan 31116, Korea
| | - Seohyun Park
- Research Center for Industrialization of Natural Neutralization, Dankook University, Cheonan 31116, Korea; (H.-K.S.); (H.X.); (S.P.); (J.L.)
- Department of Food Science and Nutrition, Dankook University, Cheonan 31116, Korea
| | - Jisu Lee
- Research Center for Industrialization of Natural Neutralization, Dankook University, Cheonan 31116, Korea; (H.-K.S.); (H.X.); (S.P.); (J.L.)
- Department of Food Science and Nutrition, Dankook University, Cheonan 31116, Korea
| | - Jae-Joon Lee
- Department of Food and Nutrition, Chosun University, Gwangju 61452, Korea;
| | - Sunyoon Jung
- Research Center for Industrialization of Natural Neutralization, Dankook University, Cheonan 31116, Korea; (H.-K.S.); (H.X.); (S.P.); (J.L.)
- Department of Food Science and Nutrition, Dankook University, Cheonan 31116, Korea
- Correspondence: (S.J.); (J.-H.H.); Tel.: +82-31-8005-3186 (S.J.); +82-41-550-3479 (J.-H.H.)
| | - Jung-Heun Ha
- Research Center for Industrialization of Natural Neutralization, Dankook University, Cheonan 31116, Korea; (H.-K.S.); (H.X.); (S.P.); (J.L.)
- Department of Food Science and Nutrition, Dankook University, Cheonan 31116, Korea
- Correspondence: (S.J.); (J.-H.H.); Tel.: +82-31-8005-3186 (S.J.); +82-41-550-3479 (J.-H.H.)
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Baris E, Simsek O, Efe H, Oncu S, Gelal A, Hamurtekin E, Tosun M, Ozbal S, Yuce Z, Arici M. Effects of CDP-Choline and Choline on COX Pathway in LPS-Induced Inflammatory Response in Rats. INT J PHARMACOL 2021. [DOI: 10.3923/ijp.2021.84.96] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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TLR4 Signaling Selectively and Directly Promotes CGRP Release from Vagal Afferents in the Mouse. eNeuro 2021; 8:ENEURO.0254-20.2020. [PMID: 33318075 PMCID: PMC7877464 DOI: 10.1523/eneuro.0254-20.2020] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Revised: 12/03/2020] [Accepted: 12/03/2020] [Indexed: 12/14/2022] Open
Abstract
There has been a long-standing debate regarding the role of peripheral afferents in mediating rapid-onset anorexia among other responses elicited by peripheral inflammatory insults. Thus, the current study assessed the sufficiency of peripheral afferents expressing toll-like receptor 4 (TLR4) to the initiation of the anorexia caused by peripheral bacterial lipopolysaccharide (LPS). We generated a Tlr4 null (Tlr4LoxTB) mouse in which Tlr4 expression is globally disrupted by a loxP-flanked transcription blocking (TB) cassette. This novel mouse model allowed us to restore the endogenous TLR4 expression in specific cell types. Using Zp3-Cre and Nav1.8-Cre mice, we produced mice that express TLR4 in all cells (Tlr4LoxTB X Zp3-Cre) and in peripheral afferents (Tlr4LoxTB X Nav1.8-Cre), respectively. We validated the Tlr4LoxTB mice, which were phenotypically identical to previously reported global TLR4 knock-out mice. Contrary to our expectations, the administration of LPS did not cause rapid-onset anorexia in mice with Nav1.8-restricted TLR4. The later result prompted us to identify Tlr4-expressing vagal afferents using in situ hybridization (ISH). In vivo, we found that Tlr4 mRNA was primarily enriched in vagal Nav1.8 afferents located in the jugular ganglion that co-expressed calcitonin gene-related peptide (CGRP). In vitro, the application of LPS to cultured Nav1.8-restricted TLR4 afferents was sufficient to stimulate the release of CGRP. In summary, we demonstrated using a new mouse model that vagally-expressed TLR4 is selectively involved in stimulating the release of CGRP but not in causing anorexia.
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Zhang S, Niu Y, Yang Z, Zhang Y, Guo Q, Yang Y, Zhou X, Ding Y, Liu C. Biochanin A alleviates gingival inflammation and alveolar bone loss in rats with experimental periodontitis. Exp Ther Med 2020; 20:251. [PMID: 33178349 PMCID: PMC7654219 DOI: 10.3892/etm.2020.9381] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2019] [Accepted: 05/20/2020] [Indexed: 02/05/2023] Open
Abstract
Biochanin A (BA) is an organic compound produced by Trifolium pretense and Arachis hypogaea with anti-inflammatory and antioxidative effects. The aim of the current study was to evaluate the effects of BA on gingival inflammation and alveolar bone destruction in rats with experimental periodontitis. Experimental rats (n=25) were distributed equally into five groups: i) Healthy control (control) group; ii) experimental periodontitis (ligation) group; and iii) and ligation plus low, medium and high dose of BA (12.5, 25 and 50 mg/kg/day, respectively) groups. A nylon ligature was inserted around rats' maxillary molars for 14 days to trigger the experimental periodontitis. BA was intravenous injected once daily for 4 weeks. After that, interleukin-1β (IL-1β), tumor necrosis factor-α (TNF-α), reactive oxygen species (ROS) and osteocalcin (OCN) levels were determined in gingival and/or serum samples using ELISA or reverse transcription-quantitative PCR. Alveolar bone volume was assessed via hematoxylin and eosin staining and micro-computed tomography. Osteoclasts were identified by tartrate-resistant acid phosphatase staining, and the level of the nuclear factor erythroid-2 related factor 2 (Nrf2) was also detected by immunohistochemical staining. BA treatment groups showed alleviated alveolar bone resorption compared with the ligation group. Moreover, BA treatment significantly inhibited IL-1β, TNF-α, ROS levels, and reduced leukocyte acid phosphatase-positive cells, as well as increased OCN and Nrf2 levels compared with the ligation group. BA had beneficial effects on experimental periodontitis of rats. BA treatment inhibited inflammation, regulated unbalanced oxidative stress response and ameliorated the alveolar bone loss.
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Affiliation(s)
- Shengdan Zhang
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan 610041, P.R. China.,Department of Periodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - Yulong Niu
- Key Laboratory of Bio-Resources and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - Zhuo Yang
- General Stomatology Clinic, Stomatological Hospital of Chongqing Medical University, Chongqing 401147, P.R. China
| | - Yuwei Zhang
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan 610041, P.R. China.,Department of Periodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - Qiang Guo
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - Yi Yang
- Key Laboratory of Bio-Resources and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - Xuedong Zhou
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan 610041, P.R. China.,Department of Operative Dentistry and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - Yi Ding
- Department of Periodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - Chengcheng Liu
- Department of Periodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan 610041, P.R. China
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Emílio-Silva MT, Rodrigues VP, Bueno G, Ohara R, Martins MG, Horta-Júnior JAC, Branco LGS, Rocha LRM, Hiruma-Lima CA. Hypothermic Effect of Acute Citral Treatment during LPS-induced Systemic Inflammation in Obese Mice: Reduction of Serum TNF-α and Leptin Levels. Biomolecules 2020; 10:E1454. [PMID: 33080865 PMCID: PMC7603063 DOI: 10.3390/biom10101454] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Revised: 09/16/2020] [Accepted: 10/14/2020] [Indexed: 12/12/2022] Open
Abstract
Citral is a mixture of monoterpenes present in the essential oil of several plants, such as Cymbopogon citratus and Zingiber officinale, possessing anti-inflammatory, anti-ulcerogenic, and antipyretic actions. We investigated the action of citral on body temperature (Tb) and inflammatory signaling in eutrophic and obese mice during Systemic Inflammation (SI) induced by Lipopolysaccharide (LPS). Thus, we assessed the effect of citral (25, 100, and 300 mg/kg) and ibuprofen in LPS-induced SI in Swiss male mice fed a standard diet (SD) or high-fat diet (HFD) for 12 weeks. Following SI induction, we measured Tb and collected the serum, hypothalamus, and gastric mucosa for biochemical measurements. Acute treatment with citral decreased the Tb of both SD and HFD-fed animals. Citral (300 mg/kg) treatment caused a significantly lower Tb variation in HFD-fed animals than in those fed the SD. Citral reduced peripheral levels of tumor necrosis factor (TNF)-α in SD and HFD mice and decreased serum leptin concentration in HFD mice 90 min after the LPS challenge. Furthermore, citral also reduced interleukin (IL)-6 levels in the hypothalamus of obese mice. In summary, citral effectively reduced Tb during SI by reducing inflammatory mediators with a distinct action profile in HFD mice when compared with SD.
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Affiliation(s)
- Maycon T. Emílio-Silva
- Department of Structural and Functional Biology (Physiology), Institute of Biosciences, São Paulo State University (UNESP), Botucatu, São Paulo 18618-970, Brazil; (M.T.E.-S.); (V.P.R.); (G.B.); (R.O.); (L.R.M.R.)
| | - Vinicius P. Rodrigues
- Department of Structural and Functional Biology (Physiology), Institute of Biosciences, São Paulo State University (UNESP), Botucatu, São Paulo 18618-970, Brazil; (M.T.E.-S.); (V.P.R.); (G.B.); (R.O.); (L.R.M.R.)
| | - Gabriela Bueno
- Department of Structural and Functional Biology (Physiology), Institute of Biosciences, São Paulo State University (UNESP), Botucatu, São Paulo 18618-970, Brazil; (M.T.E.-S.); (V.P.R.); (G.B.); (R.O.); (L.R.M.R.)
| | - Rie Ohara
- Department of Structural and Functional Biology (Physiology), Institute of Biosciences, São Paulo State University (UNESP), Botucatu, São Paulo 18618-970, Brazil; (M.T.E.-S.); (V.P.R.); (G.B.); (R.O.); (L.R.M.R.)
| | - Marina G. Martins
- Department of Physiology, Institute of Biosciences, University of São Paulo (USP), São Paulo 05508-090, Brazil;
| | - José A. C. Horta-Júnior
- Department of Structural and Functional Biology (Anatomy), Institute of Biosciences, São Paulo State University (UNESP), Botucatu, São Paulo 18618-689, Brazil;
| | - Luiz G. S. Branco
- Department of Basic and Oral Biology, Dental School of Ribeirão Preto, University of São Paulo (USP), Ribeirão Preto, São Paulo 14040-904, Brazil;
| | - Lúcia R. M. Rocha
- Department of Structural and Functional Biology (Physiology), Institute of Biosciences, São Paulo State University (UNESP), Botucatu, São Paulo 18618-970, Brazil; (M.T.E.-S.); (V.P.R.); (G.B.); (R.O.); (L.R.M.R.)
| | - Clélia A. Hiruma-Lima
- Department of Structural and Functional Biology (Physiology), Institute of Biosciences, São Paulo State University (UNESP), Botucatu, São Paulo 18618-970, Brazil; (M.T.E.-S.); (V.P.R.); (G.B.); (R.O.); (L.R.M.R.)
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Parolini C. Marine n-3 polyunsaturated fatty acids: Efficacy on inflammatory-based disorders. Life Sci 2020; 263:118591. [PMID: 33069735 DOI: 10.1016/j.lfs.2020.118591] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 09/21/2020] [Accepted: 10/07/2020] [Indexed: 12/11/2022]
Abstract
Inflammation is a physiological response to injury, stimulating tissue repair and regeneration. However, the presence of peculiar individual conditions can negatively perturb the resolution phase eventually leading to a state of low-grade systemic chronic inflammation, characterized by tissue and organ damages and increased susceptibility to non-communicable disease. Marine n-3 polyunsaturated fatty acids (n-3 PUFAs), mainly eicosapentaenoic (EPA) and docosahexaenoic acid (DHA), are able to influence many aspects of this process. Experiments performed in various animal models of obesity, Alzheimer's disease and multiple sclerosis have demonstrated that n-3 PUFAs can modulate the basic mechanisms as well as the disease progression. This review describes the available data from experimental studies to the clinical trials.
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Affiliation(s)
- Cinzia Parolini
- Department of Pharmacological and Biomolecular Sciences, Università degli Studi di Milano, Milano, Italy.
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Scabia G, Cancello R, Dallanoce C, Berger S, Matera C, Dattilo A, Zulian A, Barone I, Ceccarini G, Santini F, De Amici M, Di Blasio AM, Maffei M. ICH3, a selective alpha7 nicotinic acetylcholine receptor agonist, modulates adipocyte inflammation associated with obesity. J Endocrinol Invest 2020; 43:983-993. [PMID: 31965518 DOI: 10.1007/s40618-020-01182-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Accepted: 01/08/2020] [Indexed: 02/06/2023]
Abstract
PURPOSE The alpha7 nicotinic acetylcholine receptor (α7nAChR), involved in the modulation of inflammation and insulin sensitivity, is downregulated in white adipose tissue (WAT) of obese patients. This study aims to test the ability of a selective synthetic α7nAChR agonist, the spirocyclic Δ2-isoxazoline derivative (R)-(-)-ICH3 (ICH3), to counteract acute inflammation and obesity-associated modifications in WAT. METHODS We employed the LPS-septic shock murine model, human primary adipocytes and diet-induced obese (DIO) mice. Inflammatory factor expression was assessed by ELISA and quantitative real-time PCR. Flow cytometry was employed to define WAT inflammatory infiltrate. Insulin signaling was monitored by quantification of AKT phosphorylation. RESULTS In the septic shock model, ICH3 revealed antipyretic action and reduced the surge of circulating cytokines. In vitro, ICH3 stimulation (10 µM) preserved viability of human adipocytes, decreased IL-6 mRNA (P < 0.05) and blunted LPS-induced peak of TNFα (P < 0.05) and IL-6 (P < 0.01). Chronic administration of ICH3 to DIO mice was associated with lower numbers of CD8+ T cells (P < 0.05) and to changed WAT expression of inflammatory factors (Hp, P < 0.05; CD301/MGL1, P < 0.01; Arg-1, P < 0.05). As compared to untreated, ICH3 DIO mice exhibited improved insulin signaling in the skeletal muscle (P < 0.01) mirrored by an improved response to glucose load (ipGTT: P < 0.05 at 120 min). CONCLUSIONS We proved that ICH3 is an anti-inflammatory drug, able to reduce inflammatory cytokines in human adipocytes and to blunt the effects of obesity on WAT inflammatory profile, on glucose tolerance and on tissue insulin sensitivity.
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Affiliation(s)
- G Scabia
- CNR Institute of Clinical Physiology, Pisa, Italy
- Obesity and Lipodystrophy Center at Endocrinology Unit, University Hospital of Pisa, Pisa, Italy
| | - R Cancello
- Laboratorio di Ricerche Sull'Obesità, Istituto Auxologico Italiano, IRCCS, Milan, Italy
| | - C Dallanoce
- Department of Pharmaceuticals Sciences, University of Milano, Milan, Italy
| | - S Berger
- Obesity and Lipodystrophy Center at Endocrinology Unit, University Hospital of Pisa, Pisa, Italy
- Dulbecco Telethon Institute, Pisa, Italy
| | - C Matera
- Department of Pharmaceuticals Sciences, University of Milano, Milan, Italy
| | - A Dattilo
- Obesity and Lipodystrophy Center at Endocrinology Unit, University Hospital of Pisa, Pisa, Italy
- Life Science Institute, Scuola Superiore Sant'Anna, Pisa, Italy
| | - A Zulian
- Laboratorio di Ricerche Sull'Obesità, Istituto Auxologico Italiano, IRCCS, Milan, Italy
| | - I Barone
- Obesity and Lipodystrophy Center at Endocrinology Unit, University Hospital of Pisa, Pisa, Italy
| | - G Ceccarini
- Obesity and Lipodystrophy Center at Endocrinology Unit, University Hospital of Pisa, Pisa, Italy
| | - F Santini
- Obesity and Lipodystrophy Center at Endocrinology Unit, University Hospital of Pisa, Pisa, Italy
| | - M De Amici
- Department of Pharmaceuticals Sciences, University of Milano, Milan, Italy
| | - A M Di Blasio
- Laboratorio di Ricerche di Biologia Molecolare, Istituto Auxologico Italiano, IRCCS, Milan, Italy.
| | - M Maffei
- CNR Institute of Clinical Physiology, Pisa, Italy.
- Obesity and Lipodystrophy Center at Endocrinology Unit, University Hospital of Pisa, Pisa, Italy.
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Wijenayake S, Rahman MF, Lum CMW, De Vega WC, Sasaki A, McGowan PO. Maternal high-fat diet induces sex-specific changes to glucocorticoid and inflammatory signaling in response to corticosterone and lipopolysaccharide challenge in adult rat offspring. J Neuroinflammation 2020; 17:116. [PMID: 32293490 PMCID: PMC7158103 DOI: 10.1186/s12974-020-01798-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Accepted: 03/31/2020] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Maternal obesity as a result of high levels of saturated fat (HFD) consumption leads to significant negative health outcomes in both mother and exposed offspring. Offspring exposed to maternal HFD show sex-specific alterations in metabolic, behavioral, and endocrine function, as well as increased levels of basal neuroinflammation that persists into adulthood. There is evidence that psychosocial stress or exogenous administration of corticosterone (CORT) potentiate inflammatory gene expression; however, the response to acute CORT or immune challenge in adult offspring exposed to maternal HFD during perinatal life is unknown. We hypothesize that adult rat offspring exposed to maternal HFD would show enhanced pro-inflammatory gene expression in response to acute administration of CORT and lipopolysaccharide (LPS) compared to control animals, as a result of elevated basal pro-inflammatory gene expression. To test this, we examined the effects of acute CORT and/or LPS exposure on pro and anti-inflammatory neural gene expression in adult offspring (male and female) with perinatal exposure to a HFD or a control house-chow diet (CHD). METHODS Rat dams consumed HFD or CHD for four weeks prior to mating, during gestation, and throughout lactation. All male and female offspring were weaned on to CHD. In adulthood, offspring were 'challenged' with administration of exogenous CORT and/or LPS, and quantitative PCR was used to measure transcript abundance of glucocorticoid receptors and downstream inflammatory markers in the amygdala, hippocampus, and prefrontal cortex. RESULTS In response to CORT alone, male HFD offspring showed increased levels of anti-inflammatory transcripts, whereas in response to LPS alone, female HFD offspring showed increased levels of pro-inflammatory transcripts. In addition, male HFD offspring showed greater pro-inflammatory gene expression and female HFD offspring exhibited increased anti-inflammatory gene expression in response to simultaneous CORT and LPS administration. CONCLUSIONS These findings suggest that exposure to maternal HFD leads to sex-specific changes that may alter inflammatory responses in the brain, possibly as an adaptive response to basal neuroinflammation.
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Affiliation(s)
- Sanoji Wijenayake
- Center for Environmental Epigenetics and Development, Department of Biological Sciences, University of Toronto, Scarborough, 1265 Military Trail, Toronto, ON, Canada
| | - Mouly F Rahman
- Center for Environmental Epigenetics and Development, Department of Biological Sciences, University of Toronto, Scarborough, 1265 Military Trail, Toronto, ON, Canada
- Department of Cell and Systems Biology, University of Toronto, Toronto, ON, Canada
| | - Christine M W Lum
- Center for Environmental Epigenetics and Development, Department of Biological Sciences, University of Toronto, Scarborough, 1265 Military Trail, Toronto, ON, Canada
- Department of Cell and Systems Biology, University of Toronto, Toronto, ON, Canada
| | - Wilfred C De Vega
- Center for Environmental Epigenetics and Development, Department of Biological Sciences, University of Toronto, Scarborough, 1265 Military Trail, Toronto, ON, Canada
- Department of Cell and Systems Biology, University of Toronto, Toronto, ON, Canada
| | - Aya Sasaki
- Center for Environmental Epigenetics and Development, Department of Biological Sciences, University of Toronto, Scarborough, 1265 Military Trail, Toronto, ON, Canada
- Department of Cell and Systems Biology, University of Toronto, Toronto, ON, Canada
| | - Patrick O McGowan
- Center for Environmental Epigenetics and Development, Department of Biological Sciences, University of Toronto, Scarborough, 1265 Military Trail, Toronto, ON, Canada.
- Department of Cell and Systems Biology, University of Toronto, Toronto, ON, Canada.
- Department of Psychology, Department of Physiology, University of Toronto, Toronto, ON, Canada.
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11
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Haley MJ, White CS, Roberts D, O'Toole K, Cunningham CJ, Rivers-Auty J, O'Boyle C, Lane C, Heaney O, Allan SM, Lawrence CB. Stroke Induces Prolonged Changes in Lipid Metabolism, the Liver and Body Composition in Mice. Transl Stroke Res 2019; 11:837-850. [PMID: 31865538 PMCID: PMC7340675 DOI: 10.1007/s12975-019-00763-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Revised: 11/22/2019] [Accepted: 11/26/2019] [Indexed: 02/08/2023]
Abstract
During recovery, stroke patients are at risk of developing long-term complications that impact quality of life, including changes in body weight and composition, depression and anxiety, as well as an increased risk of subsequent vascular events. The aetiologies and time-course of these post-stroke complications have not been extensively studied and are poorly understood. Therefore, we assessed long-term changes in body composition, metabolic markers and behaviour after middle cerebral artery occlusion in mice. These outcomes were also studied in the context of obesity, a common stroke co-morbidity proposed to protect against post-stroke weight loss in patients. We found that stroke induced long-term changes in body composition, characterised by a sustained loss of fat mass with a recovery of lean weight loss. These global changes in response to stroke were accompanied by an altered lipid profile (increased plasma free fatty acids and triglycerides) and increased adipokine release at 60 days. After stroke, the liver also showed histological changes indicative of liver damage and a decrease in plasma alanine aminotransferase (ALT) was observed. Stroke induced depression and anxiety-like behaviours in mice, illustrated by deficits in exploration, nest building and burrowing behaviours. When initial infarct volumes were matched between mice with and without comorbid obesity, these outcomes were not drastically altered. Overall, we found that stroke induced long-term changes in depressive/anxiety-like behaviours, and changes in plasma lipids, adipokines and the liver that may impact negatively on future vascular health.
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Affiliation(s)
- Michael J Haley
- Division of Neuroscience and Experimental Psychology and Lydia Becker Institute of Immunology and Inflammation, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, The University of Manchester, Manchester, M13 9PT, UK
| | - Claire S White
- Division of Neuroscience and Experimental Psychology and Lydia Becker Institute of Immunology and Inflammation, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, The University of Manchester, Manchester, M13 9PT, UK
| | - Daisy Roberts
- Division of Neuroscience and Experimental Psychology and Lydia Becker Institute of Immunology and Inflammation, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, The University of Manchester, Manchester, M13 9PT, UK
| | - Kelly O'Toole
- Division of Neuroscience and Experimental Psychology and Lydia Becker Institute of Immunology and Inflammation, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, The University of Manchester, Manchester, M13 9PT, UK
| | - Catriona J Cunningham
- Division of Neuroscience and Experimental Psychology and Lydia Becker Institute of Immunology and Inflammation, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, The University of Manchester, Manchester, M13 9PT, UK
| | - Jack Rivers-Auty
- Division of Neuroscience and Experimental Psychology and Lydia Becker Institute of Immunology and Inflammation, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, The University of Manchester, Manchester, M13 9PT, UK
| | - Conor O'Boyle
- Division of Neuroscience and Experimental Psychology and Lydia Becker Institute of Immunology and Inflammation, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, The University of Manchester, Manchester, M13 9PT, UK
| | - Conor Lane
- Division of Neuroscience and Experimental Psychology and Lydia Becker Institute of Immunology and Inflammation, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, The University of Manchester, Manchester, M13 9PT, UK
| | - Oliver Heaney
- Division of Neuroscience and Experimental Psychology and Lydia Becker Institute of Immunology and Inflammation, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, The University of Manchester, Manchester, M13 9PT, UK
| | - Stuart M Allan
- Division of Neuroscience and Experimental Psychology and Lydia Becker Institute of Immunology and Inflammation, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, The University of Manchester, Manchester, M13 9PT, UK
| | - Catherine B Lawrence
- Division of Neuroscience and Experimental Psychology and Lydia Becker Institute of Immunology and Inflammation, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, The University of Manchester, Manchester, M13 9PT, UK.
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12
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Fang J, Wang F, Song H, Wang Z, Zuo Z, Cui H, Jia Y, Deng J, Yu S, Hu Y, Shen L, Ma X, Ren Z, Gou L. AMPKα pathway involved in hepatic triglyceride metabolism disorder in diet-induced obesity mice following Escherichia coli Infection. Aging (Albany NY) 2019; 10:3161-3172. [PMID: 30398974 PMCID: PMC6286859 DOI: 10.18632/aging.101623] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2018] [Accepted: 10/27/2018] [Indexed: 01/13/2023]
Abstract
To investigate the different effects of acute pulmonary infection induced by Escherichia coli (E. coli) on lipid metabolism between diet-induced obesity (DIO, fed with high-fat diet) mice and lean mice. A total of 180 ICR mice were selected to be challenged intranasally with phosphate-buffered saline or 109 CFUs/mL of E. coli, and the body character indexes, biochemical indexes and expressions of genes and proteins involved in lipid metabolism were examined pre- and post-infection. Results revealed that, before infection, DIO mice had significantly higher body weight, adipose and liver indexes, free fatty acid and triglyceride contents than lean mice. After infection, increased free fatty acid and triglyceride contents, increased expressions of resistin, SREBP-1c, ACC1, FAS and SCD-1, and declined PPARα, CPT-1α expressions and AMPKα phosphorylation were detected in the infected group, while the change rates were more serious in the lean mice than the DIO mice. The above-mentioned findings verified that, after being infected with E. coli, hepatic lipid metabolism disorder was aggravated by activating SREBP-1c related lipid synthesis pathway and inhibiting PPARα related fatty acid oxidation pathway. However, infection-induced lipid metabolic disorders was slighter in the DIO mice than the lean mice through AMPKα pathway.
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Affiliation(s)
- Jing Fang
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan 611130, PR China
| | - Fengyuan Wang
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan 611130, PR China
| | - Hetao Song
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan 611130, PR China
| | - Zhengyi Wang
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan 611130, PR China.,Sichuan Center for Animal Disease Control and Prevention, Chengdu, Sichuan 610041, PR China
| | - Zhicai Zuo
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan 611130, PR China
| | - Hengmin Cui
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan 611130, PR China
| | - Yiping Jia
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan 611130, PR China.,Heze Animal Husbandry and Veterinary Bureau, Heze, Shandong 274000, PR China
| | - Junliang Deng
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan 611130, PR China
| | - Shumin Yu
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan 611130, PR China
| | - Yanchun Hu
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan 611130, PR China
| | - Liuhong Shen
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan 611130, PR China
| | - Xiaoping Ma
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan 611130, PR China
| | - Zhihua Ren
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan 611130, PR China
| | - Liping Gou
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan 611130, PR China
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13
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Hodges SL, Nolan SO, Tomac LA, Muhammad IDA, Binder MS, Taube JH, Lugo JN. Lipopolysaccharide-induced inflammation leads to acute elevations in pro-inflammatory cytokine expression in a mouse model of Fragile X syndrome. Physiol Behav 2019; 215:112776. [PMID: 31838149 DOI: 10.1016/j.physbeh.2019.112776] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 12/11/2019] [Accepted: 12/11/2019] [Indexed: 02/07/2023]
Abstract
Fragile X syndrome (FXS) is a neurodevelopmental disorder caused by a single genetic mutation in the Fmr1 gene, serving as the largest genetic cause of intellectual disability. Trinucleotide expansion mutations in Fmr1 result in silencing and hypermethylation of the gene, preventing synthesis of the RNA binding protein Fragile X mental retardation protein which functions as a translational repressor. Abnormal immune responses have been demonstrated to play a role in FXS pathophysiology, however, whether these alterations impact how those with FXS respond to an immune insult behaviorally is not entirely known. In the current study, we examine how Fmr1 knockout (KO) and wild type (WT) mice respond to the innate immune stimulus lipopolysaccharide (LPS), both on a molecular and behavioral level, to determine if Fmr1 mutations impact the normal physiological response to an immune insult. In response to LPS, Fmr1 KO mice had elevated hippocampal IL-1β and IL-6 mRNA levels 4 h post-treatment compared to WT mice, with no differences detected in any cytokines at baseline or between genotypes 24 h post-LPS administration. Fmr1 KO mice also had upregulated hippocampal BDNF gene expression 4 h post-treatment compared to WT mice, which was not dependent on LPS administration. There were no differences in hippocampal protein expression between genotypes in microglia (Iba1) or astrocyte (GFAP) reactivity. Further, both genotypes displayed the typical sickness response following LPS stimulation, demonstrated by a significant reduction in food burrowed by LPS-treated mice in a burrowing task. Additional investigation is critical to determine if the transient increases in cytokine expression could lead to long-term changes in downstream molecular signaling in FXS.
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Affiliation(s)
- Samantha L Hodges
- Institute of Biomedical Studies, Baylor University, Waco, TX 76798, USA
| | - Suzanne O Nolan
- Department of Psychology and Neuroscience, Baylor University, One Bear Place # 97334, Waco, TX 76798, USA
| | - Lindsay A Tomac
- Department of Psychology and Neuroscience, Baylor University, One Bear Place # 97334, Waco, TX 76798, USA
| | - Ilyasah D A Muhammad
- Department of Psychology and Neuroscience, Baylor University, One Bear Place # 97334, Waco, TX 76798, USA
| | - Matthew S Binder
- Department of Psychology and Neuroscience, Baylor University, One Bear Place # 97334, Waco, TX 76798, USA
| | - Joseph H Taube
- Institute of Biomedical Studies, Baylor University, Waco, TX 76798, USA; Department of Biology, Baylor University, Waco, TX 76798, USA
| | - Joaquin N Lugo
- Institute of Biomedical Studies, Baylor University, Waco, TX 76798, USA; Department of Psychology and Neuroscience, Baylor University, One Bear Place # 97334, Waco, TX 76798, USA; Department of Biology, Baylor University, Waco, TX 76798, USA.
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14
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Andraka JM, Sharma N, Marchalant Y. Can krill oil be of use for counteracting neuroinflammatory processes induced by high fat diet and aging? Neurosci Res 2019; 157:1-14. [PMID: 31445058 DOI: 10.1016/j.neures.2019.08.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Revised: 08/05/2019] [Accepted: 08/13/2019] [Indexed: 02/08/2023]
Abstract
Most neurodegenerative diseases, such as Alzheimer's and Parkinson's disease, demonstrate preceding or on-going inflammatory processes. Therefore, discovering effective means of counteracting detrimental inflammatory mediators in the brain could help alter aging-related disease onset and progression. Fish oil and marine-derived omega-3, long-chain polyunsaturated fatty acids (LC n-3) have shown promising anti-inflammatory effects both systemically and centrally. More specifically, krill oil (KO), extracted from small Antarctic crustaceans, is an alternative type of LC n-3 with reported health benefits including improvement of spatial memory and learning, memory loss, systemic inflammation and depression symptoms. Similar to the more widely studied fish oil, KO contains the long chain fatty acids eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) which are essential for basic brain functions. Moreover, the phospholipid bound nature of fatty acids found in KO improves bioavailability and efficiency of absorption, thus supporting the belief that KO may offer a superior method of dietary n-3 delivery. Finally, KO contains astaxanthin, an antioxidant capable of reducing potentially excessive oxidative stress and inflammation within the brain. This review will discuss the potential benefits of KO over other marine-based LC n-3 on brain inflammation and cognitive function in the context of high fat diets and aging.
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Affiliation(s)
- John M Andraka
- Department of Physical Therapy, Central Michigan University, MI, USA; Neuroscience Program, Central Michigan University, MI, USA
| | - Naveen Sharma
- Neuroscience Program, Central Michigan University, MI, USA; School of Health Sciences, Central Michigan University, MI, USA
| | - Yannick Marchalant
- Neuroscience Program, Central Michigan University, MI, USA; Psychology Department, Central Michigan University, MI, USA.
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15
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Souza ACP, Souza CM, Amaral CL, Lemes SF, Santucci LF, Milanski M, Torsoni AS, Torsoni MA. Short-Term High-Fat Diet Consumption Reduces Hypothalamic Expression of the Nicotinic Acetylcholine Receptor α7 Subunit (α7nAChR) and Affects the Anti-inflammatory Response in a Mouse Model of Sepsis. Front Immunol 2019; 10:565. [PMID: 30967878 PMCID: PMC6438922 DOI: 10.3389/fimmu.2019.00565] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2018] [Accepted: 03/04/2019] [Indexed: 01/01/2023] Open
Abstract
Sepsis is one of the leading causes of death in hospitalized patients and the chronic and low-grade inflammation observed in obesity seems to worsen susceptibility and morbidity of infections. However, little is known with respect to a short-term high-fat diet (HFD) and its role in the development of sepsis. Here, we show for the first time, that short-term HFD consumption impairs early nicotinic acetylcholine receptor α7 subunit (α7nAChR)- mediated signaling, one of the major components of the cholinergic anti-inflammatory pathway, with a focus on hypothalamic inflammation and innate immune response. Mice were randomized to a HFD or standard chow (SC) for 3 days, and sepsis was subsequently induced by a lethal intraperitoneal (i.p.) injection of lipopolysaccharide (LPS) or by cecal ligation and puncture (CLP) surgery. In a separate experiment, both groups received LPS (i.p.) or LPS (i.p.) in conjunction with the selective α7nAChR agonist, PNU-282987 (i.p. or intracerebroventricular; i.c.v.), and were sacrificed 2 h after the challenge. Short-term HFD consumption significantly reduced the α7nAChR mRNA and protein levels in the hypothalamus and liver (p < 0.05). Immunofluorescence microscopy demonstrated lower cholinergic receptor nicotinic α7 subunit (α7nAChR)+ cells in the arcuate nucleus (ARC) (α7nAChR+ cells in SC = 216 and HFD = 84) and increased F4/80+ cells in the ARC (2.6-fold) and median eminence (ME) (1.6-fold), which can contribute to neuronal damage. Glial fibrillary acidic protein (GFAP)+ cells and neuronal nuclear antigen (NeuN)+ cells were also increased following consumption of HFD. The HFD-fed mice died quickly after a lethal dose of LPS or following CLP surgery (2-fold compared with SC). The LPS challenge raised most cytokine levels in both groups; however, higher levels of TNF-α (Spleen and liver), IL-1β and IL-6 (in all tissues evaluated) were observed in HFD-fed mice. Moreover, PNU-282987 administration (i.p. or i.c.v.) reduced the levels of inflammatory markers in the hypothalamus following LPS injection. Nevertheless, when the i.c.v. injection of PNU-282987 was performed the anti-inflammatory effect was much smaller in HFD-fed mice than SC-fed mice. Here, we provide evidence that a short-term HFD impairs early α7nAChR expression in central and peripheral tissues, contributing to a higher probability of death in sepsis.
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Affiliation(s)
- Anelise Cristina Parras Souza
- School of Applied Sciences, University of Campinas, Limeira, Brazil.,Obesity and Comorbidities Research Center, State University of Campinas, Limeira, Brazil
| | - Camilla Mendes Souza
- School of Applied Sciences, University of Campinas, Limeira, Brazil.,Obesity and Comorbidities Research Center, State University of Campinas, Limeira, Brazil
| | - Camila Libardi Amaral
- School of Applied Sciences, University of Campinas, Limeira, Brazil.,Obesity and Comorbidities Research Center, State University of Campinas, Limeira, Brazil
| | - Simone Ferreira Lemes
- School of Applied Sciences, University of Campinas, Limeira, Brazil.,Obesity and Comorbidities Research Center, State University of Campinas, Limeira, Brazil
| | - Leticia Foglia Santucci
- School of Applied Sciences, University of Campinas, Limeira, Brazil.,Obesity and Comorbidities Research Center, State University of Campinas, Limeira, Brazil
| | - Marciane Milanski
- School of Applied Sciences, University of Campinas, Limeira, Brazil.,Obesity and Comorbidities Research Center, State University of Campinas, Limeira, Brazil
| | - Adriana Souza Torsoni
- School of Applied Sciences, University of Campinas, Limeira, Brazil.,Obesity and Comorbidities Research Center, State University of Campinas, Limeira, Brazil
| | - Marcio Alberto Torsoni
- School of Applied Sciences, University of Campinas, Limeira, Brazil.,Obesity and Comorbidities Research Center, State University of Campinas, Limeira, Brazil
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16
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Sui GG, Xiao HB, Lu XY, Sun ZL. Naringin Activates AMPK Resulting in Altered Expression of SREBPs, PCSK9, and LDLR To Reduce Body Weight in Obese C57BL/6J Mice. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:8983-8990. [PMID: 30092639 DOI: 10.1021/acs.jafc.8b02696] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Previous investigations have shown molecular cross-talk among activated adenosine monophosphate-activated protein kinase (AMPK), proprotein convertase subtilisin/kexin type 9 (PCSK9), sterol regulatory element-binding proteins (SREBPs), and low-density lipoprotein receptor (LDLR) and that it may be an innovative pharmacologic objective for treating obesity. We scrutinized the beneficial effect of naringin, a flavanone-7- O-glycoside, on obesity and the mechanisms in the present study. We arbitrarily divided 50 mice into five groups ( n = 10): 25 or 50 or 100 mg/kg/day naringin-treated obese mice (gavage for 8 weeks), untreated obese mice, and C57BL/6J control. After 8 weeks, body weight was 51.8 ± 4.4 in the untreated obese mice group, while the weights were 41.4 ± 4.1, 34.6 ± 2.2, and 28.0 ± 2.3 in 25, 50,100 mg/kg naringin groups, respectively. Moreover, naringin treatment significantly decreased plasma 8-isoprostane (an indicator of the oxidative stress) level, fat weight, liver weight, hepatic total cholesterol concentration, hepatic triglyceride concentration, plasma leptin level, plasma insulin content, plasma low-density lipoprotein cholesterol level, and plasma PCSK9 production concomitantly with down-regulated expression of SREBP-2, PCSK9, and SREBP-1, and up-regulated expression of p-AMPKα and LDLR. The present results suggest that naringin activates AMPK resulting in altered expression of SREBPs, PCSK9, and LDLR to reduce the body weight of obese C57BL/6J mice.
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Affiliation(s)
- Guo-Guang Sui
- College of Veterinary Medicine , Hunan Agricultural University , Changsha 410128 , China
| | - Hong-Bo Xiao
- College of Veterinary Medicine , Hunan Agricultural University , Changsha 410128 , China
| | - Xiang-Yang Lu
- Hunan Province University Key Laboratory for Agricultural Biochemistry and Biotransformation , Hunan Agricultural University , Changsha 410128 , China
- Hunan Co-Innovation Center for Ultilization of Botanical Functional Ingredients , Changsha 410128 , China
| | - Zhi-Liang Sun
- Hunan Engineering Research Center of Veterinary Drug , Changsha 410128 , China
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17
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Chaves Filho AJM, Lima CNC, Vasconcelos SMM, de Lucena DF, Maes M, Macedo D. IDO chronic immune activation and tryptophan metabolic pathway: A potential pathophysiological link between depression and obesity. Prog Neuropsychopharmacol Biol Psychiatry 2018; 80:234-249. [PMID: 28595944 DOI: 10.1016/j.pnpbp.2017.04.035] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Revised: 04/03/2017] [Accepted: 04/10/2017] [Indexed: 12/12/2022]
Abstract
Obesity and depression are among the most pressing health problems in the contemporary world. Obesity and depression share a bidirectional relationship, whereby each condition increases the risk of the other. By inference, shared pathways may underpin the comorbidity between obesity and depression. Activation of cell-mediated immunity (CMI) is a key factor in the pathophysiology of depression. CMI cytokines, including IFN-γ, TNFα and IL-1β, induce the catabolism of tryptophan (TRY) by stimulating indoleamine 2,3-dioxygenase (IDO) resulting in the synthesis of kynurenine (KYN) and other tryptophan catabolites (TRYCATs). In the CNS, TRYCATs have been related to oxidative damage, inflammation, mitochondrial dysfunction, cytotoxicity, excitotoxicity, neurotoxicity and lowered neuroplasticity. The pathophysiology of obesity is also associated with a state of aberrant inflammation that activates aryl hydrocarbon receptor (AHR), a pathway involved in the detection of intracellular or environmental changes as well as with increases in the production of TRYCATs, being KYN an agonists of AHR. Both AHR and TRYCATS are involved in obesity and related metabolic disorders. These changes in the TRYCAT pathway may contribute to the onset of neuropsychiatric symptoms in obesity. This paper reviews the role of immune activation, IDO stimulation and increased TRYCAT production in the pathophysiology of depression and obesity. Here we suggest that increased synthesis of detrimental TRYCATs is implicated in comorbid obesity and depression and is a new drug target to treat both diseases.
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Affiliation(s)
- Adriano José Maia Chaves Filho
- Neuropsychopharmacology Laboratory, Drug Research and Development Center, Faculty of Medicine, Universidade Federal do Ceará, Fortaleza, CE, Brazil; Department of Physiology and Pharmacology, Faculty of Medicine, Universidade Federal do Ceará, Fortaleza, CE, Brazil
| | - Camila Nayane Carvalho Lima
- Neuropsychopharmacology Laboratory, Drug Research and Development Center, Faculty of Medicine, Universidade Federal do Ceará, Fortaleza, CE, Brazil; Department of Physiology and Pharmacology, Faculty of Medicine, Universidade Federal do Ceará, Fortaleza, CE, Brazil
| | - Silvânia Maria Mendes Vasconcelos
- Neuropsychopharmacology Laboratory, Drug Research and Development Center, Faculty of Medicine, Universidade Federal do Ceará, Fortaleza, CE, Brazil; Department of Physiology and Pharmacology, Faculty of Medicine, Universidade Federal do Ceará, Fortaleza, CE, Brazil
| | - David Freitas de Lucena
- Neuropsychopharmacology Laboratory, Drug Research and Development Center, Faculty of Medicine, Universidade Federal do Ceará, Fortaleza, CE, Brazil; Department of Physiology and Pharmacology, Faculty of Medicine, Universidade Federal do Ceará, Fortaleza, CE, Brazil
| | - Michael Maes
- Impact Strategic Research Center, Deakin University, Geelong, Australia; Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand; Health Sciences Graduate Program, Health Sciences Center, State University of Londrina, Londrina, Brazil
| | - Danielle Macedo
- Neuropsychopharmacology Laboratory, Drug Research and Development Center, Faculty of Medicine, Universidade Federal do Ceará, Fortaleza, CE, Brazil; Department of Physiology and Pharmacology, Faculty of Medicine, Universidade Federal do Ceará, Fortaleza, CE, Brazil.
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18
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Belegri E, Eggels L, la Fleur SE, Boelen A. One-Week Exposure to a Free-Choice High-Fat High-Sugar Diet Does Not Interfere With the Lipopolysaccharide-Induced Acute Phase Response in the Hypothalamus of Male Rats. Front Endocrinol (Lausanne) 2018; 9:186. [PMID: 29760677 PMCID: PMC5937016 DOI: 10.3389/fendo.2018.00186] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/06/2017] [Accepted: 04/06/2018] [Indexed: 12/13/2022] Open
Abstract
Obesity has been associated with increased susceptibility to infection in humans and rodents. Obesity is also associated with low-grade hypothalamic inflammation that depends not only on body weight but also on diet. In the present study, we investigated if the bacterial endotoxin [lipopolysaccharide (LPS)]-induced acute phase response is aggravated in rats on a 1-week free-choice high-fat high-sugar (fcHFHS) diet and explained by diet-induced hypothalamic inflammation. Male Wistar rats were on an fcHFHS diet or chow for 1 week and afterwards intraperitoneally injected with LPS or saline. Hypothalamic inflammatory intermediates and plasma cytokines were measured after LPS. Both LPS and the fcHFHS diet altered hypothalamic Nfkbia mRNA and nuclear factor of kappa light polypeptide gene enhancer in B cells inhibitor alpha (NFKBIA) protein levels, whereas Il1β, Il6, and Tnfα mRNA expression was solely induced upon LPS. We observed an interaction in hypothalamic Nfkbia and suppressor of cytokine signaling (SOCS) 3 mRNA upon LPS; both were higher in rats on a fcHFHS diet compared with chow animals. Despite this, plasma cytokine levels between fcHFHS diet-fed and chow-fed rats were similar after LPS administration. Consuming a fcHFHS diet but not LPS injections increased hypothalamic Atf4 (a cellular stress marker) mRNA expression, whereas Tlr4 mRNA was decreased only upon LPS. Our study does not support a role for diet-induced mild hypothalamic inflammation in the increased susceptibility to infection despite altered Nfkbia and Socs3 mRNA expression after the diet. Additional factors, related to increased fat mass, might be involved.
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Affiliation(s)
- Evita Belegri
- Department of Endocrinology and Metabolism, Academic Medical Centre, Amsterdam, Netherlands
- Laboratory of Endocrinology, Department of Clinical Chemistry, Academic Medical Centre, Amsterdam, Netherlands
| | - Leslie Eggels
- Department of Endocrinology and Metabolism, Academic Medical Centre, Amsterdam, Netherlands
- Laboratory of Endocrinology, Department of Clinical Chemistry, Academic Medical Centre, Amsterdam, Netherlands
- Metabolism and Reward Group, Netherlands Institute for Neuroscience, Royal Netherlands Academy of Arts and Sciences (KNAW), Amsterdam, Netherlands
| | - Susanne E. la Fleur
- Department of Endocrinology and Metabolism, Academic Medical Centre, Amsterdam, Netherlands
- Laboratory of Endocrinology, Department of Clinical Chemistry, Academic Medical Centre, Amsterdam, Netherlands
- Metabolism and Reward Group, Netherlands Institute for Neuroscience, Royal Netherlands Academy of Arts and Sciences (KNAW), Amsterdam, Netherlands
| | - Anita Boelen
- Department of Endocrinology and Metabolism, Academic Medical Centre, Amsterdam, Netherlands
- Laboratory of Endocrinology, Department of Clinical Chemistry, Academic Medical Centre, Amsterdam, Netherlands
- *Correspondence: Anita Boelen,
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19
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Acute Strenuous Exercise Induces an Imbalance on Histone H4 Acetylation/Histone Deacetylase 2 and Increases the Proinflammatory Profile of PBMC of Obese Individuals. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2017; 2017:1530230. [PMID: 29142617 PMCID: PMC5671743 DOI: 10.1155/2017/1530230] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Revised: 08/07/2017] [Accepted: 09/10/2017] [Indexed: 02/08/2023]
Abstract
This study evaluated the response of global histone H4 acetylation (H4ac), histone deacetylase 2 (HDAC2) activity, as well as the production of proinflammatory cytokines and monocyte phenotypes of lean and obese males after exercise. Ten lean and ten obese sedentary men were submitted to one session of strenuous exercise, and peripheral blood mononuclear cells (PBMC) were stimulated in vitro with lipopolysaccharide (LPS). Global H4ac levels, HDAC2 activity in PBMC, and IL-6, IL-8, and TNF-α production were analyzed. Monocyte phenotype was determined in accordance with the expression of CD14 and CD16. At rest, obese individuals presented higher frequency of proinflammatory CD14+CD16+ monocytes. LPS induced a significant augment in global H4ac and in the production of IL-6, IL-8, and TNF-α mainly in obese individuals. After exercise, the increased production of IL-8 and TNF-α and peripheral frequency of CD14+CD16+ were observed in both groups. In addition, exercise also induced a significant hyperacetylation of histone H4 and decreased HDAC2 activity in both nonstimulated and LPS-stimulated PBMC of obese individuals. Our data indicate that the obesity impacts on H4ac levels and that strenuous exercise leads to an enhanced chronic low-grade inflammation profile in obesity via an imbalance on H4ac/HDAC2.
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Yu T, Zhao L, Huang X, Xie M, Wang X, Ma C, Xu Y, Wang Y, Xie B, Luo G, Zhang J, Xuan D. Postoperative Weight Loss Masks Metabolic Impacts of Periodontitis in Obese Rodents. J Periodontol 2017; 88:e97-e108. [PMID: 28394188 DOI: 10.1902/jop.2017.160655] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Ting Yu
- Key Laboratory of Oral Medicine, Guangzhou Institute of Oral Disease, Stomatology Hospital of Guangzhou Medical University, Guangzhou, China
| | - Li Zhao
- Department of Prosthodontics, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, China
- Guangdong Provincial Key Laboratory of Stomatology, Guangdong Engineering Research Center of Technology and Materials for Oral Reconstruction, Guangzhou, China
| | - Xin Huang
- Department of Periodontology, Affiliated Hospital of Stomatology, Southern Medical University, Guangzhou, China
| | - Meilian Xie
- Department of Periodontology, Ai Kang Jian Dental Group, Shenzhen, China
| | - Xiangli Wang
- Department of Periodontology, Hangzhou Dental Hospital, Savaid Medical School, University of Chinese Academy of Sciences, Hangzhou, China
| | - Chanjuan Ma
- Department of Periodontology, Affiliated Hospital of Stomatology, Southern Medical University, Guangzhou, China
| | - Yixin Xu
- Department of Periodontology, Affiliated Hospital of Stomatology, Southern Medical University, Guangzhou, China
| | - Yixiong Wang
- Department of Periodontology, Affiliated Hospital of Stomatology, Southern Medical University, Guangzhou, China
| | - Baoyi Xie
- Department of Periodontology, Affiliated Hospital of Stomatology, Southern Medical University, Guangzhou, China
| | - Gang Luo
- Key Laboratory of Oral Medicine, Guangzhou Institute of Oral Disease, Stomatology Hospital of Guangzhou Medical University, Guangzhou, China
| | - Jincai Zhang
- Department of Periodontology, Savaid Medical School, University of Chinese Academy of Sciences, Beijing, China
| | - Dongying Xuan
- Department of Periodontology, Hangzhou Dental Hospital, Savaid Medical School, University of Chinese Academy of Sciences, Hangzhou, China
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Xiao HB, Sui GG, Lu XY. Phillyrin lowers body weight in obese mice via the modulation of PPAR<beta>/<delta>-ANGPTL 4 pathway. Obes Res Clin Pract 2017; 12:71-79. [PMID: 28320596 DOI: 10.1016/j.orcp.2017.02.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/23/2016] [Revised: 02/10/2017] [Accepted: 02/20/2017] [Indexed: 12/14/2022]
Abstract
OBJECTIVE Previous investigations have shown that the peroxisome proliferator activated receptor beta/delta (PPAR<beta>/<delta>)-angiopoietin-like protein 4 (ANGPTL4) pathways may be a new pharmacologic target for treatment of obesity. The present study was conducted to test the effect of phillyrin, a glucoside, on obesity in mice. METHOD Fifty mice were randomly divided into 5 groups (n=10): control group (C57BL/6J mice), obese mice group, two groups of obese mice treated with phillyrin (15 or 45mg/kg/day), one group of obese mice treated with PPAR<beta>/<delta> agonist GW0742 (3mg/kg/day). Twelve weeks after treatment, body weight, liver weight, fat weight, lipid levels in the liver, serum levels of tumour necrosis factor-<alpha>(TNF-<alpha>), leptin, and insulin, expression of PPAR<beta>/<delta>, ANGPTL4, and AMP-activated protein kinase (AMPK) were determined. RESULTS Treatment with phillyrin (15 or 45mg/kg) significantly decreased body weight, liver weight, fat weight, hepatic total cholesterol, free fatty acid, and triglyceride concentrations, serum levels of TNF-<alpha>, leptin, and insulin concomitantly with up-regulated expression of PPAR<beta>/<delta>, ANGPTL4, and p-AMPK-<alpha>. In addition, GW0742 has similar effect of phillyrin. CONCLUSIONS The present results suggest that phillyrin could regulate the PPAR<beta>/<delta>-ANGPTL 4 pathway to lower body weight in obese C57BL/6J mice.
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Affiliation(s)
- Hong-Bo Xiao
- College of Veterinary Medicine, Hunan Agricultural University, Changsha 410128, China.
| | - Guo-Guang Sui
- College of Veterinary Medicine, Hunan Agricultural University, Changsha 410128, China
| | - Xiang-Yang Lu
- Hunan Province University Key Laboratory for Agricultural Biochemistry and Biotransformation, Hunan Agricultural University, Changsha 410128, China; Hunan Co-Innovation Center for Ultilization of Botanical Functional Ingredients, Changsha 410128, China
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Astiz M, Pernía O, Barrios V, Garcia-Segura LM, Diz-Chaves Y. Short-Term High-Fat Diet Feeding Provides Hypothalamic but Not Hippocampal Protection against Acute Infection in Male Mice. Neuroendocrinology 2017; 104:40-50. [PMID: 26862917 DOI: 10.1159/000444527] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/13/2015] [Accepted: 02/06/2016] [Indexed: 11/19/2022]
Abstract
Obesity is associated with increased fever and sickness behavior in response to infection. The hypothalamic-pituitary-adrenal (HPA) axis plays a key role in the reaction to immune stimuli. Bacterial infection, or bacterial lipopolysaccharide (LPS), induces the expression of peripheral cytokines that stimulate the hypothalamus and the hippocampus and activate the HPA axis. In this study, we explored whether the hypothalamic and hippocampal responses to infection are altered during the development of diet-induced obesity. Male mice were exposed to a high-fat diet (HFD) or a low-fat diet (LFD) for 15 days. They were then administered a single intraperitoneal injection of bacterial LPS or vehicle and sacrificed 24 h later. LPS increased circulating levels of insulin and leptin, but only in LFD animals. LPS induced a significant decrease in hypothalamic corticotrophin-releasing hormone and glucocorticoid receptor mRNA levels in LFD animals but exerted the opposite effect in HFD-fed mice. LPS increased the hypothalamic expression of molecules involved in the leptin signaling pathway (SOCS3 and STAT3), nuclear factor-κB pathway members, inflammatory mediators (tumor necrosis factor-α and interleukin-6) and glial proliferation markers (Emr1 and CD68) in LFD animals. These effects were dampened in HFD-fed mice. In contrast, the hippocampal responses to LPS were largely insensitive to HFD. These results suggest that HFD feeding reduced the inflammatory response induced by LPS in the hypothalamus but not in the hippocampus.
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Capuron L, Lasselin J, Castanon N. Role of Adiposity-Driven Inflammation in Depressive Morbidity. Neuropsychopharmacology 2017; 42:115-128. [PMID: 27402495 PMCID: PMC5143483 DOI: 10.1038/npp.2016.123] [Citation(s) in RCA: 110] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Revised: 06/27/2016] [Accepted: 07/01/2016] [Indexed: 02/07/2023]
Abstract
Depression and metabolic disorders, including overweight and obesity, appear tightly interrelated. The prevalence of these conditions is concurrently growing worldwide, and both depression and overweight/obesity represent substantial risk factors for multiple medical complications. Moreover, there is now multiple evidence for a bidirectional relationship between depression and increased adiposity, with overweight/obesity being associated with an increased prevalence of depression, and in turn, depression augmenting the risk of weight gain and obesity. Although the reasons for this intricate link between depression and increased adiposity remain unclear, converging clinical and preclinical evidence points to a critical role for inflammatory processes and related alterations of brain functions. In support of this notion, increased adiposity leads to a chronic low-grade activation of inflammatory processes, which have been shown elsewhere to have a potent role in the pathophysiology of depression. It is therefore highly possible that adiposity-driven inflammation contributes to the development of depressive disorders and their growing prevalence worldwide. This review will present recent evidence in support of this hypothesis and will discuss the underlying mechanisms and potential therapeutic targets. Altogether, findings presented here should help to better understand the mechanisms linking adiposity to depression and facilitate the identification of new preventive and/or therapeutic strategies.
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Affiliation(s)
- Lucile Capuron
- Laboratory of Nutrition and Integrative Neurobiology (NutriNeuro), INRA, Bordeaux, France
- University of Bordeaux, Nutrition and Integrative Neurobiology (NutriNeuro), Bordeaux, France
| | - Julie Lasselin
- Institute of Medical Psychology and Behavioral Immunobiology, Universitäts Klinikum Essen, Essen, Germany
- Department of Clinical Neuroscience, Division for Psychology, Karolinska Institutet, Stockholm, Sweden
- Stress Research Institute, Stockholm University, Stockholm, Sweden
| | - Nathalie Castanon
- Laboratory of Nutrition and Integrative Neurobiology (NutriNeuro), INRA, Bordeaux, France
- University of Bordeaux, Nutrition and Integrative Neurobiology (NutriNeuro), Bordeaux, France
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The Role of Sex and Sex Hormones in Regulating Obesity-Induced Inflammation. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2017; 1043:65-86. [PMID: 29224091 DOI: 10.1007/978-3-319-70178-3_5] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Metabolic and non-metabolic complications due to obesity are becoming more prevalent, yet our understanding of the mechanisms driving these is not. This is due to individual risk factor variability making it difficult to predict disease outcomes such as diabetes and insulin resistance. Gender is a critical factor in obesity outcomes with women having more adiposity but reduced metabolic complications compared to men. The role of immune system activation during obesity is an emerging field that links adiposity to metabolic syndrome. Furthermore, evidence from animal models suggests that sex differences exist in immune responses and, therefore, could be a possible mechanism leading to sex differences in metabolic disease. While there is still much to learn in the area of sex-differences research, this chapter will review the current knowledge and literature detailing the role of sex and sex hormones on adiposity and metabolically induced inflammation in obesity.
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Abstract
Critical illness is a major cause of morbidity and mortality around the world. While obesity is often detrimental in the context of trauma, it is paradoxically associated with improved outcomes in some septic patients. The reasons for these disparate outcomes are not well understood. A number of animal models have been used to study the obese response to various forms of critical illness. Just as there have been many animal models that have attempted to mimic clinical conditions, there are many clinical scenarios that can occur in the highly heterogeneous critically ill patient population that occupies hospitals and intensive care units. This poses a formidable challenge for clinicians and researchers attempting to understand the mechanisms of disease and develop appropriate therapies and treatment algorithms for specific subsets of patients, including the obese. The development of new, and the modification of existing animal models, is important in order to bring effective treatments to a wide range of patients. Not only do experimental variables need to be matched as closely as possible to clinical scenarios, but animal models with pre-existing comorbid conditions need to be studied. This review briefly summarizes animal models of hemorrhage, blunt trauma, traumatic brain injury, and sepsis. It also discusses what has been learned through the use of obese models to study the pathophysiology of critical illness in light of what has been demonstrated in the clinical literature.
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Wan T, Yuan G, Ren Y, Zuo Z, Wang Z, Jia Y, Cui H, Peng X, Fang J, Deng J, Yu S, Hu Y, Shen L, Ma X, Wang Y, Ren Z. Diet-induced obese mice exhibit altered immune responses to acute lung injury induced by Escherichia coli. Obesity (Silver Spring) 2016; 24:2101-10. [PMID: 27558300 PMCID: PMC5095879 DOI: 10.1002/oby.21608] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2015] [Revised: 05/06/2016] [Accepted: 05/11/2016] [Indexed: 11/05/2022]
Abstract
OBJECTIVE Obesity has been associated with impaired immunity and increased susceptibility to bacterial infection. It also exerts protective effects against mortality secondary to acute lung injury. The effects of obesity on immune responses to acute lung injury induced by Escherichia coli were investigated to determine if the above-mentioned differences in its effects were related to infection severity. METHODS Diet-induced obesity (DIO) and lean control mice received intranasal instillations of 10(9) or 10(10) CFUs of E. coli. The immune responses were examined at 0 h (uninfected), 24 h, and 96 h postinfection. RESULTS Following infection, the DIO mice exhibited higher leukocyte, interleukin (IL)-10, IL-6, and tumor necrosis factor-α levels and more severe lung injury than the lean mice. Following inoculation with 10(10) CFUs of E. coli, the DIO mice exhibited higher mortality and more severe inflammation-induced injury than the lean mice, but no differences in E. coli counts were noted between the two groups. However, inoculated with 10(9) CFUs of E. coli, the DIO mice exhibited smaller E. coli burdens at 24 h and 96 h after infection, as well as lower concentrations of IL-10 and tumor necrosis factor-α and less severe lung injury at 96 h after infection. CONCLUSIONS The results support the emerging view that obesity may be beneficial in the setting of milder infection but detrimental in the setting of more severe infection.
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Affiliation(s)
- Taomei Wan
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Sichuan Province, Wenjiang, China
| | - Guiqiang Yuan
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Sichuan Province, Wenjiang, China
| | - Yi Ren
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Sichuan Province, Wenjiang, China
| | - Zhicai Zuo
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Sichuan Province, Wenjiang, China..
| | - Zhengyi Wang
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Sichuan Province, Wenjiang, China
| | - Yiping Jia
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Sichuan Province, Wenjiang, China
| | - Hengmin Cui
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Sichuan Province, Wenjiang, China
| | - Xi Peng
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Sichuan Province, Wenjiang, China
| | - Jing Fang
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Sichuan Province, Wenjiang, China
| | - Junliang Deng
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Sichuan Province, Wenjiang, China
| | - Shumin Yu
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Sichuan Province, Wenjiang, China
| | - Yanchun Hu
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Sichuan Province, Wenjiang, China
| | - Liuhong Shen
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Sichuan Province, Wenjiang, China
| | - Xiaoping Ma
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Sichuan Province, Wenjiang, China
| | - Ya Wang
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Sichuan Province, Wenjiang, China
| | - Zhihua Ren
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Sichuan Province, Wenjiang, China
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Kell DB, Pretorius E. On the translocation of bacteria and their lipopolysaccharides between blood and peripheral locations in chronic, inflammatory diseases: the central roles of LPS and LPS-induced cell death. Integr Biol (Camb) 2016; 7:1339-77. [PMID: 26345428 DOI: 10.1039/c5ib00158g] [Citation(s) in RCA: 111] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
We have recently highlighted (and added to) the considerable evidence that blood can contain dormant bacteria. By definition, such bacteria may be resuscitated (and thus proliferate). This may occur under conditions that lead to or exacerbate chronic, inflammatory diseases that are normally considered to lack a microbial component. Bacterial cell wall components, such as the endotoxin lipopolysaccharide (LPS) of Gram-negative strains, are well known as potent inflammatory agents, but should normally be cleared. Thus, their continuing production and replenishment from dormant bacterial reservoirs provides an easy explanation for the continuing, low-grade inflammation (and inflammatory cytokine production) that is characteristic of many such diseases. Although experimental conditions and determinants have varied considerably between investigators, we summarise the evidence that in a great many circumstances LPS can play a central role in all of these processes, including in particular cell death processes that permit translocation between the gut, blood and other tissues. Such localised cell death processes might also contribute strongly to the specific diseases of interest. The bacterial requirement for free iron explains the strong co-existence in these diseases of iron dysregulation, LPS production, and inflammation. Overall this analysis provides an integrative picture, with significant predictive power, that is able to link these processes via the centrality of a dormant blood microbiome that can resuscitate and shed cell wall components.
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Affiliation(s)
- Douglas B Kell
- School of Chemistry and The Manchester Institute of Biotechnology, The University of Manchester, 131, Princess St, Manchester M1 7DN, Lancs, UK.
| | - Etheresia Pretorius
- Department of Physiology, Faculty of Health Sciences, University of Pretoria, Arcadia 0007, South Africa.
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Liu Y, Huang Y, Liu T, Wu H, Cui H, Gautron L. Lipopolysacharide Rapidly and Completely Suppresses AgRP Neuron-Mediated Food Intake in Male Mice. Endocrinology 2016; 157:2380-92. [PMID: 27111742 PMCID: PMC4891783 DOI: 10.1210/en.2015-2081] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Although Agouti-related peptide (AgRP) neurons play a key role in the regulation of food intake, their contribution to the anorexia caused by proinflammatory insults has yet to be identified. Using a combination of neuroanatomical and pharmacogenetics experiments, this study sought to investigate the importance of AgRP neurons and downstream targets in the anorexia caused by the peripheral administration of a moderate dose of lipopolysaccharide (LPS) (100 μg/kg, ip). First, in the C57/Bl6 mouse, we demonstrated that LPS induced c-fos in select AgRP-innervated brain sites involved in feeding but not in any arcuate proopiomelanocortin neurons. Double immunohistochemistry further showed that LPS selectively induced c-Fos in a large subset of melanocortin 4 receptor-expressing neurons in the lateral parabrachial nucleus. Secondly, we used pharmacogenetics to stimulate the activity of AgRP neurons during the course of LPS-induced anorexia. In AgRP-Cre mice expressing the designer receptor hM3Dq-Gq only in AgRP neurons, the administration of the designer drug clozapine-N-oxide (CNO) induced robust food intake. Strikingly, CNO-mediated food intake was rapidly and completely blunted by the coadministration of LPS. Neuroanatomical experiments further indicated that LPS did not interfere with the ability of CNO to stimulate c-Fos in AgRP neurons. In summary, our findings combined together support the view that the stimulation of select AgRP-innervated brain sites and target neurons, rather than the inhibition of AgRP neurons themselves, is likely to contribute to the rapid suppression of food intake observed during acute bacterial endotoxemia.
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Affiliation(s)
- Yang Liu
- Division of Hypothalamic Research and Department of Internal Medicine (Y.L., Y.H., T.L., L.G.), The University of Texas Southwestern Medical Center, Dallas, Texas 75390; Department of Orthopedics (Y.L., H.W.), Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China 430030; and Department of Pharmacology (H.C.), Center for Hypertension Research, Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Carver College of Medicine, Iowa City, Iowa 52242
| | - Ying Huang
- Division of Hypothalamic Research and Department of Internal Medicine (Y.L., Y.H., T.L., L.G.), The University of Texas Southwestern Medical Center, Dallas, Texas 75390; Department of Orthopedics (Y.L., H.W.), Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China 430030; and Department of Pharmacology (H.C.), Center for Hypertension Research, Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Carver College of Medicine, Iowa City, Iowa 52242
| | - Tiemin Liu
- Division of Hypothalamic Research and Department of Internal Medicine (Y.L., Y.H., T.L., L.G.), The University of Texas Southwestern Medical Center, Dallas, Texas 75390; Department of Orthopedics (Y.L., H.W.), Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China 430030; and Department of Pharmacology (H.C.), Center for Hypertension Research, Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Carver College of Medicine, Iowa City, Iowa 52242
| | - Hua Wu
- Division of Hypothalamic Research and Department of Internal Medicine (Y.L., Y.H., T.L., L.G.), The University of Texas Southwestern Medical Center, Dallas, Texas 75390; Department of Orthopedics (Y.L., H.W.), Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China 430030; and Department of Pharmacology (H.C.), Center for Hypertension Research, Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Carver College of Medicine, Iowa City, Iowa 52242
| | - Huxing Cui
- Division of Hypothalamic Research and Department of Internal Medicine (Y.L., Y.H., T.L., L.G.), The University of Texas Southwestern Medical Center, Dallas, Texas 75390; Department of Orthopedics (Y.L., H.W.), Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China 430030; and Department of Pharmacology (H.C.), Center for Hypertension Research, Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Carver College of Medicine, Iowa City, Iowa 52242
| | - Laurent Gautron
- Division of Hypothalamic Research and Department of Internal Medicine (Y.L., Y.H., T.L., L.G.), The University of Texas Southwestern Medical Center, Dallas, Texas 75390; Department of Orthopedics (Y.L., H.W.), Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China 430030; and Department of Pharmacology (H.C.), Center for Hypertension Research, Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Carver College of Medicine, Iowa City, Iowa 52242
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Griffin C, Lanzetta N, Eter L, Singer K. Sexually dimorphic myeloid inflammatory and metabolic responses to diet-induced obesity. Am J Physiol Regul Integr Comp Physiol 2016; 311:R211-6. [PMID: 27252473 DOI: 10.1152/ajpregu.00136.2016] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2016] [Accepted: 05/30/2016] [Indexed: 01/09/2023]
Abstract
It is well known in clinical and animal studies that women and men have different disease risk as well as different disease physiology. Women of reproductive age are protected from metabolic and cardiovascular disease compared with postmenopausal women and men. Most murine studies are skewed toward the use of male mice to study obesity-induced metabolic dysfunction because of similar protection in female mice. We have investigated dietary obesity in a mouse model and have directly compared inflammatory responses in males and females. In this review we will summarize what is known about sex differences in diet-induced inflammation and will summarize our data on this topic. It is clear that sex differences in high-fat diet-induced inflammatory activation are due to cell intrinsic differences in hematopoietic responses to obesogenic cues, but further research is needed to understand what leads to sexually dimorphic responses.
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Affiliation(s)
- C Griffin
- Division of Pediatric Endocrinology, Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, Michigan
| | - N Lanzetta
- Division of Pediatric Endocrinology, Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, Michigan
| | - L Eter
- Division of Pediatric Endocrinology, Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, Michigan
| | - K Singer
- Division of Pediatric Endocrinology, Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, Michigan
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PI3K p110β subunit in leptin receptor expressing cells is required for the acute hypophagia induced by endotoxemia. Mol Metab 2016; 5:379-391. [PMID: 27257598 PMCID: PMC4877663 DOI: 10.1016/j.molmet.2016.03.003] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/22/2016] [Revised: 03/08/2016] [Accepted: 03/14/2016] [Indexed: 12/21/2022] Open
Abstract
Objective Hypophagia and increased energy expenditure under inflammatory conditions, such as that observed after bacterial lipopolysaccharide (LPS) administration, are associated with leptin secretion. The hypophagic effect of leptin depends in part on the activation of PI3K signaling pathway. However, the role of PI3K in the endotoxemia-induced hypophagia has not been determined. Methods In an attempt to examine the functional contribution of the PI3K pathway in hypophagia and weight loss induced by LPS (100 ug/Kg, ip), we performed a central pharmacological PI3K inhibition (LY294002). Additionally, to gain mechanistic insights on the role of the catalytic PI3K p110α subunit in leptin responsive cells, mice expressing Cre-recombinase driven by the Lepr promoter (LepR-Cre) were crossed with mice carrying a loxP-modified p110α allele (Pi3kca gene) (LepRΔp110α). As studies have suggested that the PI3K p110β subunit has a dominant role over p110α in energy homeostasis, we further crossed LepR-Cre mice with loxP-modified p110α and p110β (Pi3kcb gene) alleles (LepRΔp110α+β). In order to verify the requirement of leptin in PI3K effects on food intake, we also used leptin-deficient ob/ob mice. Results We found that LPS stimulates PI3K and STAT3 signaling pathways in cells expressing the leptin receptor. Central PI3K inhibition prevented LPS-induced hypophagia and weight loss. Genetic deletion of p110α subunit selectively in LepR cells had no effect on LPS-induced hypophagia and weight loss. However, p110α and p110β double deletion in LepR cells prevented LPS-induced hypophagia and partially reversed the weight loss. Leptin deficiency blunted LPS-induced acute pAKT and pSTAT3 phosphorylation and the acute suppression of food intake. Conclusions Our studies show that the PI3K p110β subunit in LepR cells is required for acute endotoxemic hypophagia. The data provide promising approaches for PI3K inhibition in preventing low energy balance and cachectic states during inflammatory challenges. Bacterial lipopolyssacharide (LPS) stimulates PI3K pathway in hypothalamic LepR expressing cells. LPS-induced hypophagia is prevented by central PI3K inhibition. PI3K p110α subunit in LepR cells is not required for LPS-induced hypophagia. PI3K p110α and p110β double deletion in LepR cells prevents LPS-induced hypophagia.
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Rummel C, Bredehöft J, Damm J, Schweighöfer H, Peek V, Harden LM. Obesity Impacts Fever and Sickness Behavior During Acute Systemic Inflammation. Physiology (Bethesda) 2016; 31:117-30. [DOI: 10.1152/physiol.00049.2015] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Obesity is reaching dramatic proportions in humans and is associated with a higher risk for cardiovascular disease, diabetes, and cognitive alterations, and a higher mortality during infection and inflammation. The focus of the present review is on the influence of obesity on the presentation of fever, sickness behavior, and inflammatory responses during acute systemic inflammation.
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Affiliation(s)
- Christoph Rummel
- Department of Veterinary-Physiology and Biochemistry, Justus-Liebig-University Giessen, Giessen, Germany; and
| | - Janne Bredehöft
- Department of Veterinary-Physiology and Biochemistry, Justus-Liebig-University Giessen, Giessen, Germany; and
| | - Jelena Damm
- Department of Veterinary-Physiology and Biochemistry, Justus-Liebig-University Giessen, Giessen, Germany; and
| | - Hanna Schweighöfer
- Department of Veterinary-Physiology and Biochemistry, Justus-Liebig-University Giessen, Giessen, Germany; and
| | - Verena Peek
- Department of Veterinary-Physiology and Biochemistry, Justus-Liebig-University Giessen, Giessen, Germany; and
| | - Lois M Harden
- Brain Function Research Group, School of Physiology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
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Payolla TB, Lemes SF, de Fante T, Reginato A, Mendes da Silva C, de Oliveira Micheletti T, Rodrigues HG, Torsoni AS, Milanski M, Torsoni MA. High-fat diet during pregnancy and lactation impairs the cholinergic anti-inflammatory pathway in the liver and white adipose tissue of mouse offspring. Mol Cell Endocrinol 2016; 422:192-202. [PMID: 26687064 DOI: 10.1016/j.mce.2015.12.004] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/28/2015] [Revised: 12/04/2015] [Accepted: 12/04/2015] [Indexed: 12/24/2022]
Abstract
Cholinergic anti-inflammatory pathway (CAP) prevents inflammatory cytokines production. The main was to evaluate the effect of maternal obesity on cholinergic pathway in the offspring. Female mice were subjected to either standard chow (SC) or high-fat diet (HFD) during pregnancy and the lactation period. After weaning, only male offspring from HFD dams (HFD-O) and from SC dams (SC-O) were fed the SC diet. Key proteins of the CAP were downregulated and serum TNF-α was elevated in the HFD-O mice. STAT3 and NF-κB activation in HFD-O mice ICV injected with nicotine (agonist) were lower than SC-O mice. Basal cholinesterase activity was upregulated in HFD-O mice in both investigated tissues. Lipopolysaccharide increased TNF-α and IL-1β expression in the liver and WAT of SC-O mice, but this effect was greater in HFD-O mice. In conclusion these changes exacerbated cytokine production in response to LPS and contributed to the reduced sensitivity of the CAP.
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Affiliation(s)
| | | | - Thaís de Fante
- School of Applied Sciences, University of Campinas, Brazil
| | | | - Cristiano Mendes da Silva
- Department of Biosciences, Federal University of São Paulo, Brazil; Obesity and Comorbidities Research Center, State University of Campinas, Brazil
| | | | | | - Adriana Souza Torsoni
- School of Applied Sciences, University of Campinas, Brazil; Department of Biosciences, Federal University of São Paulo, Brazil; Obesity and Comorbidities Research Center, State University of Campinas, Brazil
| | - Marciane Milanski
- School of Applied Sciences, University of Campinas, Brazil; Department of Biosciences, Federal University of São Paulo, Brazil; Obesity and Comorbidities Research Center, State University of Campinas, Brazil
| | - Marcio Alberto Torsoni
- School of Applied Sciences, University of Campinas, Brazil; Department of Biosciences, Federal University of São Paulo, Brazil; Obesity and Comorbidities Research Center, State University of Campinas, Brazil.
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33
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Orlandi L, Fonseca WF, Enes-Marques S, Paffaro VA, Vilela FC, Giusti-Paiva A. Sickness behavior is accentuated in rats with metabolic disorders induced by a fructose diet. J Neuroimmunol 2015; 289:75-83. [DOI: 10.1016/j.jneuroim.2015.10.014] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2015] [Revised: 10/19/2015] [Accepted: 10/21/2015] [Indexed: 12/11/2022]
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Dudele A, Fischer CW, Elfving B, Wegener G, Wang T, Lund S. Chronic exposure to low doses of lipopolysaccharide and high-fat feeding increases body mass without affecting glucose tolerance in female rats. Physiol Rep 2015; 3:3/11/e12584. [PMID: 26537342 PMCID: PMC4673625 DOI: 10.14814/phy2.12584] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Obesity-related inflammation may have a causal role in the development of diabetes and insulin resistance, and studies using animal models of chronic experimental endotoxemia have shown the link. However, many studies use only males, and much less is known about the role of obesity-related inflammation in females. Therefore, we addressed how experimentally induced chronic inflammation affects body mass, energy intake, and glucose metabolism in female rats. Adult female Sprague Dawley rats were instrumented with slow release pellets that delivered a constant daily dose of 53 or 207 μg of lipopolysaccharide (LPS) per rat for 60 days. Control rats were instrumented with vehicle pellets. Due to inflammatory nature of high-fat diet (HFD) half of the rats received HFD (60% of calories from lard), while the other half remained on control diet to detect possible interactions between two modes of induced inflammation. Our results showed that chronic LPS administration increased female rat body mass and calorie intake in a dose-dependent manner, and that HFD further exacerbated these effects. Despite these effects, no effects of LPS and HFD were evident on female rat glucose metabolism. Only LPS elevated expression of inflammatory markers in the hypothalamus. To conclude, female rats respond to experimentally induced chronic inflammation by increasing body mass, but do not develop glucose intolerance in the given period of time.
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Affiliation(s)
- Anete Dudele
- Section for Zoophysiology, Department of Bioscience, Aarhus University, Aarhus, Denmark
| | - Christina W Fischer
- Translational Neuropsychiatry Unit, Department of Clinical Medicine, Aarhus University, Risskov, Denmark
| | - Betina Elfving
- Translational Neuropsychiatry Unit, Department of Clinical Medicine, Aarhus University, Risskov, Denmark
| | - Gregers Wegener
- Translational Neuropsychiatry Unit, Department of Clinical Medicine, Aarhus University, Risskov, Denmark
| | - Tobias Wang
- Section for Zoophysiology, Department of Bioscience, Aarhus University, Aarhus, Denmark
| | - Sten Lund
- Medical Research Laboratory, Department of Endocrinology and Internal Medicine, Aarhus University Hospital, Aarhus, Denmark
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Maysami S, Haley MJ, Gorenkova N, Krishnan S, McColl BW, Lawrence CB. Prolonged diet-induced obesity in mice modifies the inflammatory response and leads to worse outcome after stroke. J Neuroinflammation 2015; 12:140. [PMID: 26239227 PMCID: PMC4524371 DOI: 10.1186/s12974-015-0359-8] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2015] [Accepted: 07/03/2015] [Indexed: 12/05/2022] Open
Abstract
Background Obesity increases the risk for ischaemic stroke and is associated with worse outcome clinically and experimentally. Most experimental studies have used genetic models of obesity. Here, a more clinically relevant model, diet-induced obesity, was used to study the impact of obesity over time on the outcome and inflammatory response after stroke. Methods Male C57BL/6 mice were maintained on a high-fat (60 % fat) or control (12 % fat) diet for 2, 3, 4 and 6 months when experimental stroke was induced by transient occlusion of the middle cerebral artery (MCAo) for either 20 (6-month diet) or 30 min (2-, 3-, 4- and 6-month diet). Ischaemic damage, blood–brain barrier (BBB) integrity, neutrophil number and chemokine expression in the brain were assessed at 24 h. Plasma chemokine levels (at 4 and 24 h) and neutrophil number in the liver (at 24 h) were measured. Physiological parameters (body weight and blood glucose) were measured in naïve control- and high-fat-fed mice at all time points and blood pressure at 3 and 6 months. Blood cell counts were also assessed in naïve 6-month control- and high-fat-fed mice. Results Mice fed a high-fat diet for 6 months had greater body weight, blood glucose and white and red blood cell count but no change in systolic blood pressure. After 4 and 6 months of high-fat feeding, and in the latter group with a 30-min (but not 20-min) occlusion of the MCA, obese mice had greater ischaemic brain damage. An increase in blood–brain barrier permeability, chemokine expression (CXCL-1 and CCL3), neutrophil number and microglia/macrophage cells was observed in the brains of 6-month high-fat-fed mice after 30-min MCAo. In response to stroke, chemokine (CXCL-1) expression in the plasma and liver was significantly different in obese mice (6-month high-fat fed), and a greater number of neutrophils were detected in the liver of control but not obese mice. Conclusions The detrimental effects of diet-induced obesity on stroke were therefore dependent on the severity of obesity and length of ischaemic challenge. The altered inflammatory response in obese mice may play a key role in its negative impact on stroke.
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Affiliation(s)
- Samaneh Maysami
- Faculty of Life Sciences, The University of Manchester, Oxford Road, Manchester, M13 9PT, UK.,Faculty of Medical and Human Sciences, The University of Manchester, Oxford Road, Manchester, M13 9PT, UK
| | - Michael J Haley
- Faculty of Life Sciences, The University of Manchester, Oxford Road, Manchester, M13 9PT, UK
| | - Natalia Gorenkova
- Faculty of Life Sciences, The University of Manchester, Oxford Road, Manchester, M13 9PT, UK
| | - Siddharth Krishnan
- Faculty of Life Sciences, The University of Manchester, Oxford Road, Manchester, M13 9PT, UK
| | - Barry W McColl
- The Roslin Institute and R(D)SVS, University of Edinburgh Easter Bush, Midlothian, EH25 9RG, UK
| | - Catherine B Lawrence
- Faculty of Life Sciences, The University of Manchester, Oxford Road, Manchester, M13 9PT, UK.
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Eun BL, Abraham J, Mlsna L, Kim MJ, Koh S. Lipopolysaccharide potentiates hyperthermia-induced seizures. Brain Behav 2015; 5:e00348. [PMID: 26357586 PMCID: PMC4559014 DOI: 10.1002/brb3.348] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/07/2015] [Revised: 03/25/2015] [Accepted: 04/05/2015] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND Prolonged febrile seizures (FS) have both acute and long-lasting effects on the developing brain. Because FS are often associated with peripheral infection, we aimed to develop a preclinical model of FS that simulates fever and immune activation in order to facilitate the implementation of targeted therapy after prolonged FS in young children. METHODS The innate immune activator lipopolysaccharide (LPS) was administered to postnatal day 14 rat (200 μg/kg) and mouse (100 μg/kg) pups 2-2.5 h prior to hyperthermic seizures (HT) induced by hair dryer or heat lamp. To determine whether simulation of infection enhances neuronal excitability, latency to seizure onset, threshold temperature and total number of seizures were quantified. Behavioral seizures were correlated with electroencephalographic changes in rat pups. Seizure-induced proinflammatory cytokine production was assessed in blood samples at various time points after HT. Seizure-induced microglia activation in the hippocampus was quantified using Cx3cr1(GFP/+) mice. RESULTS Lipopolysaccharide priming increased susceptibility of rats and mice to hyperthemic seizures and enhanced seizure-induced proinflammatory cytokine production and microglial activation. CONCLUSIONS Peripheral inflammation appears to work synergistically with hyperthermia to potentiate seizures and to exacerbate seizure-induced immune responses. By simulating fever, a regulated increase in body temperature from an immune challenge, we developed a more clinically relevant animal model of prolonged FS.
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Affiliation(s)
- Baik-Lin Eun
- Department of Pediatrics, Korea University College of Medicine Seoul, Korea
| | - Jayne Abraham
- Department of Pediatrics, Ann and Robert H. Lurie Children's Hospital of Chicago Stanley Manne Children's Research Institute, Northwestern University Feinberg School of Medicine Chicago, Illinois
| | - Lauren Mlsna
- Department of Pediatrics, Ann and Robert H. Lurie Children's Hospital of Chicago Stanley Manne Children's Research Institute, Northwestern University Feinberg School of Medicine Chicago, Illinois
| | - Min Jung Kim
- Department of Pediatrics, Ann and Robert H. Lurie Children's Hospital of Chicago Stanley Manne Children's Research Institute, Northwestern University Feinberg School of Medicine Chicago, Illinois
| | - Sookyong Koh
- Department of Pediatrics, Ann and Robert H. Lurie Children's Hospital of Chicago Stanley Manne Children's Research Institute, Northwestern University Feinberg School of Medicine Chicago, Illinois
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37
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Hunsche C, Hernandez O, De la Fuente M. Impaired Immune Response in Old Mice Suffering from Obesity and Premature Immunosenescence in Adulthood. J Gerontol A Biol Sci Med Sci 2015. [DOI: 10.1093/gerona/glv082] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
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38
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Castanon N, Luheshi G, Layé S. Role of neuroinflammation in the emotional and cognitive alterations displayed by animal models of obesity. Front Neurosci 2015; 9:229. [PMID: 26190966 PMCID: PMC4490252 DOI: 10.3389/fnins.2015.00229] [Citation(s) in RCA: 120] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2015] [Accepted: 06/11/2015] [Indexed: 12/15/2022] Open
Abstract
Obesity is associated with a high prevalence of mood disorders and cognitive dysfunctions in addition to being a significant risk factor for important health complications such as cardiovascular diseases and type 2 diabetes. Identifying the pathophysiological mechanisms underlying these health issues is a major public health challenge. Based on recent findings, from studies conducted on animal models of obesity, it has been proposed that inflammatory processes may participate in both the peripheral and brain disorders associated with the obesity condition including the development of emotional and cognitive alterations. This is supported by the fact that obesity is characterized by peripheral low-grade inflammation, originating from increased adipose tissue mass and/or dysbiosis (changes in gut microbiota environment), both of which contribute to increased susceptibility to immune-mediated diseases. In this review, we provide converging evidence showing that obesity is associated with exacerbated neuroinflammation leading to dysfunction in vulnerable brain regions associated with mood regulation, learning, and memory such as the hippocampus. These findings give new insights to the pathophysiological mechanisms contributing to the development of brain disorders in the context of obesity and provide valuable data for introducing new therapeutic strategies for the treatment of neuropsychiatric complications often reported in obese patients.
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Affiliation(s)
- Nathalie Castanon
- Nutrition and Integrative Neurobiology, INRA, UMR 1286, Université de Bordeaux Bordeaux, France
| | - Giamal Luheshi
- Department of Psychiatry, Douglas Mental Health University Institute, McGill University Montreal, Canada
| | - Sophie Layé
- Nutrition and Integrative Neurobiology, INRA, UMR 1286, Université de Bordeaux Bordeaux, France
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39
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Kell D, Potgieter M, Pretorius E. Individuality, phenotypic differentiation, dormancy and 'persistence' in culturable bacterial systems: commonalities shared by environmental, laboratory, and clinical microbiology. F1000Res 2015; 4:179. [PMID: 26629334 PMCID: PMC4642849 DOI: 10.12688/f1000research.6709.2] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 09/04/2015] [Indexed: 01/28/2023] Open
Abstract
For bacteria, replication mainly involves growth by binary fission. However, in a very great many natural environments there are examples of phenotypically dormant, non-growing cells that do not replicate immediately and that are phenotypically 'nonculturable' on media that normally admit their growth. They thereby evade detection by conventional culture-based methods. Such dormant cells may also be observed in laboratory cultures and in clinical microbiology. They are usually more tolerant to stresses such as antibiotics, and in clinical microbiology they are typically referred to as 'persisters'. Bacterial cultures necessarily share a great deal of relatedness, and inclusive fitness theory implies that there are conceptual evolutionary advantages in trading a variation in growth rate against its mean, equivalent to hedging one's bets. There is much evidence that bacteria exploit this strategy widely. We here bring together data that show the commonality of these phenomena across environmental, laboratory and clinical microbiology. Considerable evidence, using methods similar to those common in environmental microbiology, now suggests that many supposedly non-communicable, chronic and inflammatory diseases are exacerbated (if not indeed largely caused) by the presence of dormant or persistent bacteria (the ability of whose components to cause inflammation is well known). This dormancy (and resuscitation therefrom) often reflects the extent of the availability of free iron. Together, these phenomena can provide a ready explanation for the continuing inflammation common to such chronic diseases and its correlation with iron dysregulation. This implies that measures designed to assess and to inhibit or remove such organisms (or their access to iron) might be of much therapeutic benefit.
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Affiliation(s)
- Douglas Kell
- School of Chemistry and The Manchester Institute of Biotechnology, The University of Manchester, Manchester, Lancashire, M1 7DN, UK
| | - Marnie Potgieter
- Department of Physiology, Faculty of Health Sciences, University of Pretoria, Arcadia, 0007, South Africa
| | - Etheresia Pretorius
- Department of Physiology, Faculty of Health Sciences, University of Pretoria, Arcadia, 0007, South Africa
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40
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Kell D, Potgieter M, Pretorius E. Individuality, phenotypic differentiation, dormancy and 'persistence' in culturable bacterial systems: commonalities shared by environmental, laboratory, and clinical microbiology. F1000Res 2015; 4:179. [PMID: 26629334 DOI: 10.12688/f1000research.6709.1] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 06/29/2015] [Indexed: 01/28/2023] Open
Abstract
For bacteria, replication mainly involves growth by binary fission. However, in a very great many natural environments there are examples of phenotypically dormant, non-growing cells that do not replicate immediately and that are phenotypically 'nonculturable' on media that normally admit their growth. They thereby evade detection by conventional culture-based methods. Such dormant cells may also be observed in laboratory cultures and in clinical microbiology. They are usually more tolerant to stresses such as antibiotics, and in clinical microbiology they are typically referred to as 'persisters'. Bacterial cultures necessarily share a great deal of relatedness, and inclusive fitness theory implies that there are conceptual evolutionary advantages in trading a variation in growth rate against its mean, equivalent to hedging one's bets. There is much evidence that bacteria exploit this strategy widely. We here bring together data that show the commonality of these phenomena across environmental, laboratory and clinical microbiology. Considerable evidence, using methods similar to those common in environmental microbiology, now suggests that many supposedly non-communicable, chronic and inflammatory diseases are exacerbated (if not indeed largely caused) by the presence of dormant or persistent bacteria (the ability of whose components to cause inflammation is well known). This dormancy (and resuscitation therefrom) often reflects the extent of the availability of free iron. Together, these phenomena can provide a ready explanation for the continuing inflammation common to such chronic diseases and its correlation with iron dysregulation. This implies that measures designed to assess and to inhibit or remove such organisms (or their access to iron) might be of much therapeutic benefit.
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Affiliation(s)
- Douglas Kell
- School of Chemistry and The Manchester Institute of Biotechnology, The University of Manchester, Manchester, Lancashire, M1 7DN, UK
| | - Marnie Potgieter
- Department of Physiology, Faculty of Health Sciences, University of Pretoria, Arcadia, 0007, South Africa
| | - Etheresia Pretorius
- Department of Physiology, Faculty of Health Sciences, University of Pretoria, Arcadia, 0007, South Africa
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41
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Lund J, Hafstad AD, Boardman NT, Rossvoll L, Rolim NP, Ahmed MS, Florholmen G, Attramadal H, Wisløff U, Larsen TS, Aasum E. Exercise training promotes cardioprotection through oxygen-sparing action in high fat-fed mice. Am J Physiol Heart Circ Physiol 2015; 308:H823-9. [PMID: 25637547 DOI: 10.1152/ajpheart.00734.2014] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/14/2014] [Accepted: 01/28/2015] [Indexed: 11/22/2022]
Abstract
Although exercise training has been demonstrated to have beneficial cardiovascular effects in diabetes, the effect of exercise training on hearts from obese/diabetic models is unclear. In the present study, mice were fed a high-fat diet, which led to obesity, reduced aerobic capacity, development of mild diastolic dysfunction, and impaired glucose tolerance. Following 8 wk on high-fat diet, mice were assigned to 5 weekly high-intensity interval training (HIT) sessions (10 × 4 min at 85-90% of maximum oxygen uptake) or remained sedentary for the next 10 constitutive weeks. HIT increased maximum oxygen uptake by 13%, reduced body weight by 16%, and improved systemic glucose homeostasis. Exercise training was found to normalize diastolic function, attenuate diet-induced changes in myocardial substrate utilization, and dampen cardiac reactive oxygen species content and fibrosis. These changes were accompanied by normalization of obesity-related impairment of mechanical efficiency due to a decrease in work-independent myocardial oxygen consumption. Finally, we found HIT to reduce infarct size by 47% in ex vivo hearts subjected to ischemia-reperfusion. This study therefore demonstrated for the first time that exercise training mediates cardioprotection following ischemia in diet-induced obese mice and that this was associated with oxygen-sparing effects. These findings highlight the importance of optimal myocardial energetics during ischemic stress.
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Affiliation(s)
- J Lund
- Cardiovascular Research Group, Department of Medical Biology, Faculty of Health Sciences, UiT The Arctic University of Norway, Tromsø, Norway;
| | - A D Hafstad
- Cardiovascular Research Group, Department of Medical Biology, Faculty of Health Sciences, UiT The Arctic University of Norway, Tromsø, Norway
| | - N T Boardman
- Cardiovascular Research Group, Department of Medical Biology, Faculty of Health Sciences, UiT The Arctic University of Norway, Tromsø, Norway
| | - L Rossvoll
- Cardiovascular Research Group, Department of Medical Biology, Faculty of Health Sciences, UiT The Arctic University of Norway, Tromsø, Norway
| | - N P Rolim
- K. G. Jebsen Center of Exercise in Medicine, Department of Circulation and Medical Imaging, Faculty of Medicine, Norwegian University of Science and Technology and Saint Olavs Hospital, Trondheim University Hospital, Trondheim, Norway; and
| | - M S Ahmed
- Institute for Surgical Research, Department of Cardiology, Center for Heart Failure Research, Oslo University Hospital-Rikshospitalet, University of Oslo, Oslo, Norway
| | - G Florholmen
- Institute for Surgical Research, Department of Cardiology, Center for Heart Failure Research, Oslo University Hospital-Rikshospitalet, University of Oslo, Oslo, Norway
| | - H Attramadal
- Institute for Surgical Research, Department of Cardiology, Center for Heart Failure Research, Oslo University Hospital-Rikshospitalet, University of Oslo, Oslo, Norway
| | - U Wisløff
- K. G. Jebsen Center of Exercise in Medicine, Department of Circulation and Medical Imaging, Faculty of Medicine, Norwegian University of Science and Technology and Saint Olavs Hospital, Trondheim University Hospital, Trondheim, Norway; and
| | - T S Larsen
- Cardiovascular Research Group, Department of Medical Biology, Faculty of Health Sciences, UiT The Arctic University of Norway, Tromsø, Norway
| | - E Aasum
- Cardiovascular Research Group, Department of Medical Biology, Faculty of Health Sciences, UiT The Arctic University of Norway, Tromsø, Norway
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42
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Setti SE, Littlefield AM, Johnson SW, Kohman RA. Diet-induced obesity attenuates endotoxin-induced cognitive deficits. Physiol Behav 2014; 141:1-8. [PMID: 25542778 DOI: 10.1016/j.physbeh.2014.12.036] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2014] [Revised: 12/19/2014] [Accepted: 12/22/2014] [Indexed: 01/08/2023]
Abstract
Activation of the immune system can impair cognitive function, particularly on hippocampus dependent tasks. Several factors such as normal aging and prenatal experiences can modify the severity of these cognitive deficits. One additional factor that may modulate the behavioral response to immune activation is obesity. Prior work has shown that obesity alters the activity of the immune system. Whether diet-induced obesity (DIO) influences the cognitive deficits associated with inflammation is currently unknown. The present study explored whether DIO alters the behavioral response to the bacterial endotoxin, lipopolysaccharide (LPS). Female C57BL/6J mice were fed a high-fat (60% fat) or control diet (10% fat) for a total of five months. After consuming their respective diets for four months, mice received an LPS or saline injection and were assessed for alterations in spatial learning. One month later, mice received a second injection of LPS or saline and tissue samples were collected to assess the inflammatory response within the periphery and central nervous system. Results showed that LPS administration impaired spatial learning in the control diet mice, but had no effect in DIO mice. This lack of a cognitive deficit in the DIO female mice is likely due to a blunted inflammatory response within the brain. While cytokine production within the periphery (i.e., plasma, adipose, and spleen) was similar between the DIO and control mice, the DIO mice failed to show an increase in IL-6 and CD74 in the brain following LPS administration. Collectively, these data indicate that DIO can reduce aspects of the neuroinflammatory response as well as blunt the behavioral reaction to an immune challenge.
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Affiliation(s)
- Sharay E Setti
- University of North Carolina Wilmington, Department of Psychology, Wilmington, NC, USA.
| | - Alyssa M Littlefield
- University of North Carolina Wilmington, Department of Psychology, Wilmington, NC, USA.
| | - Samantha W Johnson
- University of North Carolina Wilmington, Department of Psychology, Wilmington, NC, USA.
| | - Rachel A Kohman
- University of North Carolina Wilmington, Department of Psychology, Wilmington, NC, USA.
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43
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Pohl J, Woodside B, Luheshi GN. Leptin modulates the late fever response to LPS in diet-induced obese animals. Brain Behav Immun 2014; 42:41-7. [PMID: 25108212 DOI: 10.1016/j.bbi.2014.07.017] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/15/2014] [Revised: 07/15/2014] [Accepted: 07/29/2014] [Indexed: 01/19/2023] Open
Abstract
Leptin is an important modulator of both inflammation and energy homeostasis, making it a key interface between the inflammatory response to pathogenic stimuli and the energy status of the host. In previous studies we demonstrated that sickness responses to systemic immune challenge, including fever, are significantly exacerbated in diet induced obese animals. To investigate whether this exacerbation is functionally linked to the obesity associated increase in circulating levels of leptin, a species-specific leptin antiserum (LAS) was used to neutralize endogenous leptin in diet-induced obese adult male Wistar rats treated with a single intraperitoneal (i.p.) injection of lipopolysaccharide (LPS) (100μg/kg). LAS significantly reduced the magnitude of the later phases of the fever response, and attenuated the circulating levels of IL-6, IL-1ra and bioactivity of leptin in the obese animals. In addition, the antiserum significantly attenuated the hypothalamic expression of IL-1ß, IκBα, COX2, SOCS3 and IL-6 in both lean and obese rats 10h after the LPS injection and NF-IL6 in the hypothalamus of obese rats only. The relatively late rise in brain IL-6 suggested a role in mediating the extended fever response in obese animals and we tested this by neutralizing brain IL-6 using an IL6-AS injected intracerebroventricularly (4μl, icv). The IL6-AS significantly but transiently (between 9h and 12h post LPS) reduced the late fever response of obese rats. These results demonstrate that leptin plays an important part in modulating the late portion of the fever response to LPS, likely through the induction of hypothalamic IL-6 in obese animals.
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Affiliation(s)
- Joanna Pohl
- Douglas Mental Health University Institute, McGill University, Montreal, Quebec, Canada
| | - Barbara Woodside
- Center for Studies in Behavioural Neurobiology, Concordia University, Montreal, Quebec, Canada
| | - Giamal N Luheshi
- Douglas Mental Health University Institute, McGill University, Montreal, Quebec, Canada.
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44
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André C, Dinel AL, Ferreira G, Layé S, Castanon N. Diet-induced obesity progressively alters cognition, anxiety-like behavior and lipopolysaccharide-induced depressive-like behavior: focus on brain indoleamine 2,3-dioxygenase activation. Brain Behav Immun 2014; 41:10-21. [PMID: 24681251 DOI: 10.1016/j.bbi.2014.03.012] [Citation(s) in RCA: 164] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/17/2014] [Revised: 03/06/2014] [Accepted: 03/18/2014] [Indexed: 12/12/2022] Open
Abstract
Obesity is associated with a high prevalence of mood symptoms and cognitive dysfunctions that emerges as significant risk factors for important health complications such as cardiovascular diseases and type 2 diabetes. It is therefore important to identify the dynamic of development and the pathophysiological mechanisms underlying these neuropsychiatric symptoms. Obesity is also associated with peripheral low-grade inflammation and increased susceptibility to immune-mediated diseases. Excessive production of proinflammatory cytokines and the resulting activation of the brain tryptophan catabolizing enzyme indoleamine 2,3-dioxygenase (IDO) have been shown to promote neurobehavioral complications, particularly depression. In that context, questions arise about the impact of diet-induced obesity on the onset of neuropsychiatric alterations and the increased susceptibility to immune-mediated diseases displayed by obese patients, particularly through brain IDO activation. To answer these questions, we used C57Bl/6 mice exposed to standard diet or western diet (WD; consisting of palatable energy-dense food) since weaning and for 20 weeks. We then measured inflammatory and behavioral responses to a systemic immune challenge with lipopolysaccharide (LPS) in experimental conditions known to alter cognitive and emotional behaviors independently of any motor impairment. We first showed that in absence of LPS, 9 weeks of WD is sufficient to impair spatial recognition memory (in the Y-maze). On the other hand, 18 weeks of WD increased anxiety-like behavior (in the elevated plus-maze), but did not affect depressive-like behavior (in the tail-suspension and forced-swim tests). However, 20 weeks of WD altered LPS-induced depressive-like behavior compared to LPS-treated lean mice and exacerbated hippocampal and hypothalamic proinflammatory cytokine expression and brain IDO activation. Taken together, these results show that WD exposure alters cognition and anxiety in unstimulated conditions and enhances activation of neurobiological mechanisms underlying depression after immune stimulation. They suggest therefore that obesity, and possibly obesity-associated inflammatory priming, may represent a vulnerability state to immune-mediated depressive symptoms.
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Affiliation(s)
- Caroline André
- INRA, Nutrition and Integrative Neurobiology, UMR 1286, 33076 Bordeaux, France; Université de Bordeaux, Nutrition and Integrative Neurobiology, UMR 1286, 33076 Bordeaux, France
| | - Anne-Laure Dinel
- INRA, Nutrition and Integrative Neurobiology, UMR 1286, 33076 Bordeaux, France; Université de Bordeaux, Nutrition and Integrative Neurobiology, UMR 1286, 33076 Bordeaux, France
| | - Guillaume Ferreira
- INRA, Nutrition and Integrative Neurobiology, UMR 1286, 33076 Bordeaux, France; Université de Bordeaux, Nutrition and Integrative Neurobiology, UMR 1286, 33076 Bordeaux, France
| | - Sophie Layé
- INRA, Nutrition and Integrative Neurobiology, UMR 1286, 33076 Bordeaux, France; Université de Bordeaux, Nutrition and Integrative Neurobiology, UMR 1286, 33076 Bordeaux, France
| | - Nathalie Castanon
- INRA, Nutrition and Integrative Neurobiology, UMR 1286, 33076 Bordeaux, France; Université de Bordeaux, Nutrition and Integrative Neurobiology, UMR 1286, 33076 Bordeaux, France.
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Hyperlipidemia causes changes in inflammatory responses to periodontal pathogen challenge: implications in acute and chronic infections. Arch Oral Biol 2014; 59:1075-84. [PMID: 24992577 DOI: 10.1016/j.archoralbio.2014.06.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2014] [Revised: 06/02/2014] [Accepted: 06/12/2014] [Indexed: 12/16/2022]
Abstract
OBJECTIVE In this study, the effect of hyperlipidemia on immune responses to periodontal bacterial infections was investigated. METHODS Sixty male New Zealand white rabbits were equally assigned to normal diet (ND) and high-fat diet (HFD) for 6 weeks. Every six rabbits with ND or HFD were orally inoculated with live Aggregatibacter actinomycetemcomitans and Porphyromonas gingivalis three times a week for 8 weeks. Also every six rabbits with ND or HFD rabbits were injected intravenously with A. actinomycetemcomitans and P. gingivalis LPS. Periodontal disease severity was quantified by macroscopic and radiographical evaluation. Serum cytokines were examined by enzyme-linked immunosorbent assay. In vitro, peripheral mononuclear cells were collected and stimulated with LPS. Quantitative real-time polymerase chain reaction was used to determine the changes in gene expression of macrophages. RESULTS In the early stages of infection, HFD rabbits were exposed to oral infection and systemic infection developed a weak inflammatory response to the reduced cytokine expression compared with ND rabbits. However, HFD rabbits exhibited higher inflammatory cytokine expression during long-term infections. Moreover, the pronounced changes in inflammatory cytokine expression elicited a significantly increase in bone loss in HFD rabbits with oral infection. Peripheral macrophages harvested from HFD rabbits and exposed to LPS exhibited reduced levels of pro-inflammatory cytokines compared with those from ND rabbits in vitro. CONCLUSION These data indicated that hyperlipidemia interfered with immune responses differently. The mechanism is possibly associated with immune paralysis in the acute phase and accumulation of inflammatory mediators in the chronic period.
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Development of a murine model of early sepsis in diet-induced obesity. BIOMED RESEARCH INTERNATIONAL 2014; 2014:719853. [PMID: 24967393 PMCID: PMC4054609 DOI: 10.1155/2014/719853] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/13/2013] [Accepted: 02/25/2014] [Indexed: 12/15/2022]
Abstract
Sepsis, a global health issue, is the most common cause of mortality in the intensive care unit. The aim of this study was to develop a new model of sepsis that investigates the impact of prolonged western diet (WD) induced obesity on the response to early sepsis. Male C57BL/6 mice were fed either a high fat WD or normal chow diet (NCD) for 6, 15, or 27 weeks. Septic obese mice at 15 and 27 weeks had significantly lower levels of lung myeloperoxidase (26.3 ± 3.80 U/mg tissue) compared to age matched ad lib (44.1 ± 2.86 U/mg tissue) and diet restricted (63.2 ± 5.60 U/mg tissue) controls. Low levels of lung inflammation were not associated with changes in hepatic cytokines and oxidative stress levels. Obese mice had significantly (P < 0.0001) larger livers compared to controls. Histological examination of the livers demonstrated that WD fed mice had increased inflammation with pronounced fat infiltration, steatosis, and hepatocyte ballooning. Using this model of prolonged exposure to high fat diet we have data that agree with recent clinical observations suggesting obese individuals are protected from sepsis-induced lung injury. This model will allow us to investigate the links between damage to the hepatic microcirculation, immune response, and lung injury.
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Auraptene in the Peels of Citrus kawachiensis (Kawachi Bankan) Ameliorates Lipopolysaccharide-Induced Inflammation in the Mouse Brain. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2014; 2014:408503. [PMID: 24955102 PMCID: PMC4052083 DOI: 10.1155/2014/408503] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/27/2013] [Revised: 01/25/2014] [Accepted: 01/27/2014] [Indexed: 11/17/2022]
Abstract
Examination of the dried peel powder of Citrus kawachiensis, one of the citrus products of Ehime, Japan, showed that it contained naringin (NGIN; 44.02 ± 0.491 mg/g), narirutin (NRTN; 4.46 ± 0.0563 mg/g), auraptene (AUR; 4.07 ± 0.033 mg/g), and 3,5,6,7,8,3′,4′-heptamethoxyflavone (HMF; 0.27 ± 0.0039 mg/g). When this dried peel powder was orally preadministered at the dose of 1.2 or 2.4 g/kg/day for 7 days into lipopolysaccharide- (LPS-) injected mice, an animal model of systemic inflammation, it suppressed (1) LPS-induced loss of body weight and abnormal behavior in the open field, (2) LPS-induced activation of microglia and astrocytes in the hippocampus, and (3) LPS-induced expression of cyclooxygenase (COX)-2, which were coexpressed in astrocytes of these mice. When NGIN or AUR was preadministered to LPS-injected mice at an amount similar to that in the peel powder, AUR, but not NGIN, had the ability to suppress the LPS-induced inflammation in the brain of these model mice. The dried powder of flavedo tissue (the outer colored layer of the mesocarp of a citrus fruit) and juice, which contained sufficient amounts of AUR, also had anti-inflammatory effect. These results suggest that AUR was the main ingredient responsible for the anti-inflammatory property of the dried peels of C. kawachiensis.
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He K, Li Y, Yang K, Gong JP, Li PZ. Effect of peroxisome proliferator-activated receptor γ on the cholesterol efflux of peritoneal macrophages in inflammation. Mol Med Rep 2014; 10:373-8. [PMID: 24788275 DOI: 10.3892/mmr.2014.2200] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2013] [Accepted: 03/12/2014] [Indexed: 11/05/2022] Open
Abstract
Atherosclerosis, a chronic inflammatory disorder characterized by lipid and cholesterol accumulation, is the principal contributing factor to the pathology of cardiovascular disease. Macrophages contribute to plaque development by internalizing native and modified lipoproteins that convert them into cholesterol-rich foam cells. With multiple factors, including hypercholesterolemia and inflammation, promoting atherosclerosis, it is of great significance to elucidate how the mechanism of cholesterol efflux from the macrophages changes and the role of peroxisome proliferator-activated receptor γ (PPARγ) in these situations. Following isolation and culture of peritoneal macrophages from C57BL/6 mice in the present study, the cells were divided into three groups: The control group, the ciglitazone group and the PPARγ antisense oligonucleotide group. The expression of PPARγ and nuclear factor of κ light polypeptide gene enhancer in B‑cells inhibitor α (IκBα) in each group was observed through the levels of protein and mRNA, and then the cholesterol efflux of each group was investigated. In addition, the same experiments were repeated following stimulation of each group with lipopolysaccharide (LPS). No significant difference in the expression levels of PPARγ between the control group and ciglitazone group was observed. The expression levels of PPARγ in the PPARγ antisense oligonucleotide group were evidently lower than those in the control group. Subsequent to stimulation with LPS, the expression levels of PPARγ in the three groups were higher than those of each group prior to stimulation. The cholesterol efflux of the PPARγ antisense oligonucleotide group was clearly suppressed following stimulation with LPS in comparison with that of the other groups. PPARγ contributes to anti-inflammation by protecting IκBα from being phosphorylated and degraded and promoting cholesterol efflux from peritoneal macrophages in inflammation.
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Affiliation(s)
- Kun He
- Department of Hepatobiliary Surgery, The Second Affiliated Hospital of Chongqing Medical University, Chongqing 400010, P.R. China
| | - Yue Li
- Department of Hepatobiliary Surgery, The Second Affiliated Hospital of Chongqing Medical University, Chongqing 400010, P.R. China
| | - Kang Yang
- Department of Hepatobiliary Surgery, The Second Affiliated Hospital of Chongqing Medical University, Chongqing 400010, P.R. China
| | - Jian-Ping Gong
- Department of Hepatobiliary Surgery, The Second Affiliated Hospital of Chongqing Medical University, Chongqing 400010, P.R. China
| | - Pei-Zhi Li
- Department of Hepatobiliary Surgery, The Second Affiliated Hospital of Chongqing Medical University, Chongqing 400010, P.R. China
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Núñez IN, Galdeano CM, de LeBlanc ADM, Perdigón G. Evaluation of immune response, microbiota, and blood markers after probiotic bacteria administration in obese mice induced by a high-fat diet. Nutrition 2014; 30:1423-32. [PMID: 25280423 DOI: 10.1016/j.nut.2014.03.025] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2013] [Revised: 03/28/2014] [Accepted: 03/30/2014] [Indexed: 12/31/2022]
Abstract
OBJECTIVE Obesity is associated with alterations in intestinal microbiota and immunity. The aim of this study was to determine the effect of probiotic Lactobacillus casei CRL 431 administration on intestinal and humoral immune response, clinical parameters, and gut microbiota was evaluated using a high-fat diet to induce obesity in a mouse model. METHODS Adult mice received a conventional balanced diet or a high-fat diet supplemented with milk, milk fermented by Lactobacillus casei (FM), L. casei as suspension, or water over 60 d. Histology of liver and small intestine (SI), immunoglobulin A-positive cells and macrophages in SI, phagocytic activity of spleen and peritoneal macrophages, and humoral immune response to ovalbumin were studied. Clinical parameters in serum and gut microbiota were also analyzed. RESULTS FM was the most effective supplement for decreasing body weight and clinical parameters in serum. The histology of liver and SI was also improved in obese mice given FM. These animals had increased numbers of immunoglobulin A-positive cells and macrophages in SI. The gut microbiota showed that obese mice given probiotics had increased Bacteroides and bifidobacteria. Administration of FM or L. casei as suspension enhanced the phagocytic activity of macrophages. The anti-ovalbumin specific immune response was not increased by any supplement assayed. CONCLUSION Administration of probiotics to obese hosts improved the gut microbiota and the mucosal immunity altered by obesity, down-regulated some biochemical parameters in blood associated with metabolic syndrome, and decreased liver steatosis. These results demonstrate the potential use of probiotics in obese individuals to decrease the body weight and to improve the biochemical and immunologic parameters altered by obesity.
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Affiliation(s)
- Ivanna Novotny Núñez
- Centro de Referencia para Lactobacilos (CERELA-CONICET), San Miguel de Tucumán, Tucumán, Argentina
| | - Carolina Maldonado Galdeano
- Centro de Referencia para Lactobacilos (CERELA-CONICET), San Miguel de Tucumán, Tucumán, Argentina; Cátedra de Inmunología. Instituto de Microbiología, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Tucumán, Argentina
| | | | - Gabriela Perdigón
- Centro de Referencia para Lactobacilos (CERELA-CONICET), San Miguel de Tucumán, Tucumán, Argentina; Cátedra de Inmunología. Instituto de Microbiología, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Tucumán, Argentina.
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Baumgarner KM, Setti S, Diaz C, Littlefield A, Jones A, Kohman RA. Diet-induced obesity attenuates cytokine production following an immune challenge. Behav Brain Res 2014; 267:33-41. [PMID: 24657736 DOI: 10.1016/j.bbr.2014.03.017] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2014] [Revised: 03/04/2014] [Accepted: 03/12/2014] [Indexed: 10/25/2022]
Abstract
Obesity increases susceptibility for numerous diseases and neurological disorders including cardiovascular disease, metabolic syndrome, and dementia. One factor that may contribute to the increased risk for these conditions is the development of chronic inflammation. The current study evaluated whether diet-induced obesity (DIO) affects cognitive performance by increasing neuroinflammation and prolonging the behavioral and inflammatory response to an immune challenge. Adult male C57BL/6J mice were fed a high-fat (60% fat) or control diet (10% fat) for 2 or 5 months. After consuming their respective diets for two months, sickness associated behaviors were assessed 4 and 24h after a lipopolysaccharide (LPS) or saline injection. In a separate experiment, DIO and control mice were tested for spatial learning in the water maze and challenged with LPS one month later. Peripheral cytokine production was assessed in adipose and spleen samples and the neuroinflammatory response was assessed in hippocampal, cortical, and brain samples. DIO impaired acquisition of a spatial learning task relative to control mice. However, these deficits are unlikely to be related to inflammation as DIO showed no changes in basal cytokine levels within the periphery or brain. Further, in response to LPS DIO mice showed comparable or attenuated levels of the proinflammatory cytokines interleukin-1β and interleukin-6 relative to control mice. DIO also reduced hippocampal expression of brain-derived neurotrophic factor and the pre-synaptic marker synaptophysin. Presently, the data indicate that DIO suppresses aspects of the immune response and that cognitive deficits associated with DIO may be related to reduced neurotrophic support rather than inflammation.
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Affiliation(s)
| | - Sharay Setti
- University of North Carolina Wilmington, Department of Psychology, Wilmington, NC, USA.
| | - Carolyn Diaz
- University of North Carolina Wilmington, Department of Psychology, Wilmington, NC, USA.
| | - Alyssa Littlefield
- University of North Carolina Wilmington, Department of Psychology, Wilmington, NC, USA.
| | - Amanda Jones
- University of North Carolina Wilmington, Department of Psychology, Wilmington, NC, USA.
| | - Rachel A Kohman
- University of North Carolina Wilmington, Department of Psychology, Wilmington, NC, USA.
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