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Li F, Zhang F, Yi X, Quan LL, Yang X, Yin C, Ma Z, Wu R, Zhao W, Ling M, Lang L, Hussein A, Feng S, Fu Y, Wang J, Liang S, Zhu C, Wang L, Zhu X, Gao P, Xi Q, Zhang Y, Zhang L, Shu G, Jiang Q, Wang S. Proline hydroxylase 2 (PHD2) promotes brown adipose thermogenesis by enhancing the hydroxylation of UCP1. Mol Metab 2023:101747. [PMID: 37279828 DOI: 10.1016/j.molmet.2023.101747] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Revised: 05/30/2023] [Accepted: 05/31/2023] [Indexed: 06/08/2023] Open
Abstract
OBJECTIVE Brown adipose tissue (BAT) plays a crucial role in regulating non-shivering thermogenesis under cold exposure. Proline hydroxylases (PHDs) were found to be involved in adipocyte differentiation and lipid deposition. However, the effects of PHDs on regulatory mechanisms of BAT thermogenesis are not fully understood. METHODS We detected the expression of PHDs in different adipose tissues by using immunoblotting and real-time PCR. Further, immunoblotting, real-time PCR, and immunostaining were performed to determine the correlation between proline hydroxylase 2 (PHD2) and UCP1 expression. Inhibitor of PHDs and PHD2-sgRNA viruses were used to construct the PHD2-deficiency model in vivo and in vitro to investigate the impacts of PHD2 on BAT thermogenesis. Afterward, the interaction between UCP1 and PHD2 and the hydroxylation modification level of UCP1 were verified by Co-IP assays and immunoblotting. Finally, the effect of specific proline hydroxylation on the expression/activity of UCP1 was further confirmed by site-directed mutation of UCP1 and mass spectrometry analysis. RESULTS PHD2, but not PHD1 and PHD3, was highly enriched in BAT, colocalized, and positively correlated with UCP1. Inhibition or knockdown of PHD2 significantly suppressed BAT thermogenesis under cold exposure and aggravated obesity of mice fed HFD. Mechanistically, mitochondrial PHD2 bound to UCP1 and regulated the hydroxylation level of UCP1, which was enhanced by thermogenic activation and attenuated by PHD2 knockdown. Furthermore, PHD2-dependent hydroxylation of UCP1 promoted the expression and stability of UCP1 protein. Mutation of the specific prolines (Pro-33, 133, and 232) in UCP1 significantly mitigated the PHD2-elevated UCP1 hydroxylation level and reversed the PHD2-increased UCP1 stability. CONCLUSIONS This study suggested an important role for PHD2 in BAT thermogenesis regulation by enhancing the hydroxylation of UCP1.
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Affiliation(s)
- Fan Li
- Guangdong Provincial Key Laboratory of Animal Nutrition Control and National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Fenglin Zhang
- Guangdong Provincial Key Laboratory of Animal Nutrition Control and National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Xin Yi
- Guangdong Provincial Key Laboratory of Animal Nutrition Control and National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Lu Lu Quan
- Guangdong Provincial Key Laboratory of Animal Nutrition Control and National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Xiaohua Yang
- Guangdong Provincial Key Laboratory of Animal Nutrition Control and National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Cong Yin
- Guangdong Provincial Key Laboratory of Animal Nutrition Control and National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Zewei Ma
- Guangdong Provincial Key Laboratory of Animal Nutrition Control and National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Ruifan Wu
- Guangdong Provincial Key Laboratory of Animal Nutrition Control and National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Weijie Zhao
- Guangdong Provincial Key Laboratory of Animal Nutrition Control and National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Mingfa Ling
- Guangdong Provincial Key Laboratory of Animal Nutrition Control and National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Limin Lang
- Guangdong Provincial Key Laboratory of Animal Nutrition Control and National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Abdelaziz Hussein
- Guangdong Provincial Key Laboratory of Animal Nutrition Control and National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Shengchun Feng
- Guangdong Provincial Key Laboratory of Animal Nutrition Control and National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Yiming Fu
- Guangdong Provincial Key Laboratory of Animal Nutrition Control and National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Junfeng Wang
- Guangdong Provincial Key Laboratory of Animal Nutrition Control and National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Shuyi Liang
- Guangdong Provincial Key Laboratory of Animal Nutrition Control and National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Canjun Zhu
- Guangdong Provincial Key Laboratory of Animal Nutrition Control and National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Lina Wang
- Guangdong Provincial Key Laboratory of Animal Nutrition Control and National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Xiaotong Zhu
- Guangdong Provincial Key Laboratory of Animal Nutrition Control and National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Ping Gao
- Guangdong Provincial Key Laboratory of Animal Nutrition Control and National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Qianyun Xi
- Guangdong Provincial Key Laboratory of Animal Nutrition Control and National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Yongliang Zhang
- Guangdong Provincial Key Laboratory of Animal Nutrition Control and National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Lin Zhang
- Guangdong Provincial Key Laboratory of Animal Nutrition Control and National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Gang Shu
- Guangdong Provincial Key Laboratory of Animal Nutrition Control and National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Qingyan Jiang
- Guangdong Provincial Key Laboratory of Animal Nutrition Control and National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China.
| | - Songbo Wang
- Guangdong Provincial Key Laboratory of Animal Nutrition Control and National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China; Yunfu Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Wen's Foodstuffs Group Co., Ltd, Yunfu 527400, P. R. China.
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2
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Zhou Q, Liu C, Chen T, Liu Y, Cao R, Ni X, Yang WZ, Shen Q, Sun H, Shen WL. Cooling-activated dorsomedial hypothalamic BDNF neurons control cold defense in mice. J Neurochem 2022; 163:220-232. [PMID: 35862478 DOI: 10.1111/jnc.15666] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Revised: 07/04/2022] [Accepted: 07/05/2022] [Indexed: 12/30/2022]
Abstract
BDNF and its expressing neurons in the brain critically control feeding and energy expenditure (EE) in both rodents and humans. However, whether BDNF neurons would function in thermoregulation during temperature challenges is unclear. Here, we show that BDNF neurons in the dorsomedial hypothalamus (DMHBDNF ) of mice are activated by afferent cooling signals. These cooling-activated BDNF neurons are mainly GABAergic. Activation of DMHBDNF neurons or the GABAergic subpopulations is sufficient to increase body temperature, EE, and physical activity. Conversely, blocking DMHBDNF neurons substantially impairs cold defense and reduces energy expenditure, physical activity, and UCP1 expression in BAT, which eventually results in bodyweight gain and glucose/insulin intolerance. Therefore, we identify a subset of DMHBDNF neurons as a novel type of cooling-activated neurons to promote cold defense. Thus, we reveal a critical role of BDNF circuitry in thermoregulation, which deepens our understanding of BDNF in controlling energy homeostasis and obesity.
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Affiliation(s)
- Qian Zhou
- School of Life Science and Technology, Shanghaitech University, Shanghai, China
| | - Changhao Liu
- School of Life Science and Technology, Shanghaitech University, Shanghai, China
| | - Ting Chen
- School of Life Science and Technology, Shanghaitech University, Shanghai, China
| | - Yanyang Liu
- Department of General Surgery, Huashan Hospital, Fudan University, Shanghai, China
| | - Ren Cao
- School of Life Science and Technology, Shanghaitech University, Shanghai, China
| | - Xinyan Ni
- School of Life Science and Technology, Shanghaitech University, Shanghai, China
| | - Wen Z Yang
- School of Life Science and Technology, Shanghaitech University, Shanghai, China
| | - Qiwei Shen
- Department of General Surgery, Huashan Hospital, Fudan University, Shanghai, China
| | - Hongbin Sun
- School of Life Science and Technology, Shanghaitech University, Shanghai, China
| | - Wei L Shen
- School of Life Science and Technology, Shanghaitech University, Shanghai, China
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3
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Zhang F, Song M, Chen L, Yang X, Li F, Yang Q, Duan C, Ling M, Lai X, Zhu X, Wang L, Gao P, Shu G, Jiang Q, Wang S. Dietary Supplementation of Lauric Acid Alleviates the Irregular Estrous Cycle and the Impaired Metabolism and Thermogenesis in Female Mice Fed with High-Fat Diet (HFD). J Agric Food Chem 2020; 68:12631-12640. [PMID: 33140642 DOI: 10.1021/acs.jafc.0c05235] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Lauric acid (LA) has been implicated in the prevention/treatment of obesity. However, the role of LA in modulating an obesity-related female reproductive disorder remains largely unknown. Here, female mice were fed a control diet, high-fat diet (HFD), or HFD supplemented with 1% LA. The results demonstrated that the HFD-induced estrous cycle irregularity and the reduction of serum follicle-stimulating hormone (FSH) were alleviated by LA supplementation. In possible mechanisms, LA supplementation led to significant increase in serum lipid metabolites such as sphingomyelin and lysophosphatidylcholine containing LA (C12:0) and the improvement of glucose metabolism in mice fed HFD. Moreover, impaired body energy metabolism and weakened brown adipose tissue (BAT) thermogenesis of HFD-fed mice were improved by LA supplementation. Together, these findings showed that LA supplementation alleviated HFD-induced estrous cycle irregularity, possibly associated with altered serum lipid metabolites, improved glucose metabolism, body energy metabolism, and BAT thermogenesis. These findings suggested the potential application of LA in alleviating obesity and its related reproductive disorders.
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Affiliation(s)
- Fenglin Zhang
- Guangdong Provincial Key Laboratory of Animal Nutrition Control, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
- National Engineering Research Center for Breeding Swine Industry and UBT Lipid Suite Functional Fatty Acids Research Center, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Min Song
- Guangdong Provincial Key Laboratory of Animal Nutrition Control, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
- National Engineering Research Center for Breeding Swine Industry and UBT Lipid Suite Functional Fatty Acids Research Center, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Lin Chen
- Guangdong Provincial Key Laboratory of Animal Nutrition Control, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
- National Engineering Research Center for Breeding Swine Industry and UBT Lipid Suite Functional Fatty Acids Research Center, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Xiaohua Yang
- Guangdong Provincial Key Laboratory of Animal Nutrition Control, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
- National Engineering Research Center for Breeding Swine Industry and UBT Lipid Suite Functional Fatty Acids Research Center, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Fan Li
- Guangdong Provincial Key Laboratory of Animal Nutrition Control, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
- National Engineering Research Center for Breeding Swine Industry and UBT Lipid Suite Functional Fatty Acids Research Center, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Qiang Yang
- Guangdong Provincial Key Laboratory of Animal Nutrition Control, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
- National Engineering Research Center for Breeding Swine Industry and UBT Lipid Suite Functional Fatty Acids Research Center, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Chen Duan
- Guangdong Provincial Key Laboratory of Animal Nutrition Control, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
- National Engineering Research Center for Breeding Swine Industry and UBT Lipid Suite Functional Fatty Acids Research Center, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Mingfa Ling
- Guangdong Provincial Key Laboratory of Animal Nutrition Control, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
- National Engineering Research Center for Breeding Swine Industry and UBT Lipid Suite Functional Fatty Acids Research Center, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Xumin Lai
- Guangdong Provincial Key Laboratory of Animal Nutrition Control, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
- National Engineering Research Center for Breeding Swine Industry and UBT Lipid Suite Functional Fatty Acids Research Center, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Xiaotong Zhu
- Guangdong Provincial Key Laboratory of Animal Nutrition Control, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
- National Engineering Research Center for Breeding Swine Industry and UBT Lipid Suite Functional Fatty Acids Research Center, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Lina Wang
- Guangdong Provincial Key Laboratory of Animal Nutrition Control, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
- National Engineering Research Center for Breeding Swine Industry and UBT Lipid Suite Functional Fatty Acids Research Center, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Ping Gao
- Guangdong Provincial Key Laboratory of Animal Nutrition Control, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
- National Engineering Research Center for Breeding Swine Industry and UBT Lipid Suite Functional Fatty Acids Research Center, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Gang Shu
- Guangdong Provincial Key Laboratory of Animal Nutrition Control, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
- National Engineering Research Center for Breeding Swine Industry and UBT Lipid Suite Functional Fatty Acids Research Center, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Qingyan Jiang
- Guangdong Provincial Key Laboratory of Animal Nutrition Control, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
- National Engineering Research Center for Breeding Swine Industry and UBT Lipid Suite Functional Fatty Acids Research Center, South China Agricultural University, Guangzhou 510642, P. R. China
| | - Songbo Wang
- Guangdong Provincial Key Laboratory of Animal Nutrition Control, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China
- National Engineering Research Center for Breeding Swine Industry and UBT Lipid Suite Functional Fatty Acids Research Center, South China Agricultural University, Guangzhou 510642, P. R. China
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4
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Zhang F, Su H, Song M, Zheng J, Liu F, Yuan C, Fu Q, Chen S, Zhu X, Wang L, Gao P, Shu G, Jiang Q, Wang S. Calcium Supplementation Alleviates High-Fat Diet-Induced Estrous Cycle Irregularity and Subfertility Associated with Concomitantly Enhanced Thermogenesis of Brown Adipose Tissue and Browning of White Adipose Tissue. J Agric Food Chem 2019; 67:7073-7081. [PMID: 31240927 DOI: 10.1021/acs.jafc.9b02663] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Obesity has been demonstrated as a disruptor of female fertility. Our previous study showed the antiobesity effects of calcium on HFD-fed male mice. However, the role of calcium in alleviating reproductive dysfunction of HFD-fed female mice remains unclear. Here, we found that HFD led to estrus cycle irregularity (longer cycle duration and shorter estrus period) and subfertility (longer conception time, lower fertility index, and less implantations) in mice. However, the HFD-induced reproductive abnormality was alleviated by calcium supplementation. Additionally, calcium supplementation enhanced activation/thermogenesis of BAT and browning of WAT in HFD-fed mice. Consequently, the abnormality of energy metabolism and glucose homeostasis induced by HFD were improved by calcium supplementation, with elevated metabolic rates and core temperature. In conclusion, these data showed that calcium supplementation alleviated HFD-induced estrous cycle irregularity and subfertility associated with concomitantly enhanced BAT thermogenesis and WAT browning, suggesting the potential application of calcium in improving obesity-related reproductive disorders.
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MESH Headings
- Adipose Tissue, Brown/drug effects
- Adipose Tissue, Brown/physiopathology
- Adipose Tissue, White/drug effects
- Adipose Tissue, White/physiopathology
- Animals
- Calcium/administration & dosage
- Diet, High-Fat/adverse effects
- Dietary Supplements/analysis
- Energy Metabolism/drug effects
- Estrous Cycle/drug effects
- Female
- Genital Diseases, Female/drug therapy
- Genital Diseases, Female/etiology
- Genital Diseases, Female/metabolism
- Genital Diseases, Female/physiopathology
- Humans
- Infertility/drug therapy
- Infertility/etiology
- Infertility/metabolism
- Infertility/physiopathology
- Male
- Mice
- Mice, Inbred C57BL
- Obesity/complications
- Thermogenesis/drug effects
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5
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Michael NJ, Simonds SE, van den Top M, Cowley MA, Spanswick D. Mitochondrial uncoupling in the melanocortin system differentially regulates NPY and POMC neurons to promote weight-loss. Mol Metab 2017; 6:1103-1112. [PMID: 29031712 PMCID: PMC5641603 DOI: 10.1016/j.molmet.2017.07.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/26/2017] [Revised: 06/29/2017] [Accepted: 07/05/2017] [Indexed: 12/13/2022] Open
Abstract
Objective The mitochondrial uncoupling agent 2,4-dinitrophenol (DNP), historically used as a treatment for obesity, is known to cross the blood-brain-barrier, but its effects on central neural circuits controlling body weight are largely unknown. As hypothalamic melanocortin neuropeptide Y/agouti-related protein (NPY/AgRP) and pro-opiomelanocortin (POMC) neurons represent key central regulators of food intake and energy expenditure we investigated the effects of DNP on these neurons, food intake and energy expenditure. Method C57BL/6 and melanocortin-4 receptor (MC4R) knock-out mice were administered DNP intracerebroventricularly (ICV) and the metabolic changes were characterized. The specific role of NPY and POMC neurons and the ionic mechanisms mediating the effects of uncoupling were examined with in vitro electrophysiology performed on NPY hrGFP or POMC eGFP mice. Results Here we show DNP-induced differential effects on melanocortin neurons including inhibiting orexigenic NPY and activating anorexigenic POMC neurons through independent ionic mechanisms coupled to mitochondrial function, consistent with an anorexigenic central effect. Central administration of DNP induced weight-loss, increased BAT thermogenesis and browning of white adipose tissue, and decreased food intake, effects that were absent in MC4R knock-out mice and blocked by the MC4R antagonist, AgRP. Conclusion These data show a novel central anti-obesity mechanism of action of DNP and highlight the potential for selective melanocortin mitochondrial uncoupling to target metabolic disorders. Mitochondrial uncoupling of the melanocortin system with DNP induced weight-loss. DNP inhibited NPY neurones via activation of ATP-sensitive potassium channels. DNP activated POMC neurones via block of inwardly rectifying potassium channels. Central DNP reduced food intake and increased WAT browning and BAT thermogenesis.
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Affiliation(s)
- Natalie Jane Michael
- Metabolic Disease and Obesity Program, Biomedicine Discovery Institute, Monash University, Australia(5).
| | - Stephanie Elise Simonds
- Metabolic Disease and Obesity Program, Biomedicine Discovery Institute, Monash University, Australia(5).
| | | | - Michael Alexander Cowley
- Metabolic Disease and Obesity Program, Biomedicine Discovery Institute, Monash University, Australia(5).
| | - David Spanswick
- Neuroscience Program, Biomedicine Discovery Institute, Monash University, Australia(5); Neurosolutions, Coventry, P.O. 3517, UK; Metabolic and Vascular Health, Warwick Medical School, University of Warwick, Coventry, CV4 7AL, UK.
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6
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Yang YL, Liu X, Luo R, Xu JH, Liu C. Sinoaortic denervation attenuates vasopressin-induced hypothermia and reduction of sympathetic nerve activity innervating brown adipose tissue in rats. J Therm Biol 2017; 66:10-16. [PMID: 28477902 DOI: 10.1016/j.jtherbio.2017.03.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2016] [Revised: 03/13/2017] [Accepted: 03/13/2017] [Indexed: 10/19/2022]
Abstract
It is well known that sympathetic nerve activity innervating brown adipose tissue (BAT sympathetic nerve activity) plays an important role in BAT thermogenesis. We have found that peripheral administration of arginine vasopressin (AVP) induced hypothermia by reduced thermogenesis in BAT. However, little is known about AVP-induced hypothermic response and its relationship with BAT sympathetic nerve activity. Because increases in baroreceptor inputs inhibit peripheral sympathetic nervous activity, we hypothesized that AVP-induced hypothermia is related to baroreceptor reflex suppression of BAT sympathetic nerve activity. To test this hypothesis, Male Sprague-Dawley rats were subjected to sinoaortic denervation or sham denervation, and implanted with radiotelemetry transmitters to assess the effects of peripheral administration of AVP on BAT sympathetic nerve activity, core and BAT temperatures. In sham-operated rats, an intraperitoneal (i.p.) injection of 10µg/kg AVP led to a significant decrease in core and BAT temperatures. However, sinoaortic denervation significantly reduced the fall of core and BAT temperatures induced by AVP, compared with levels in sham-operated rats. AVP (10µg/kg i.p.) rapidly decreased BAT sympathetic nerve activity in control and sham-operated rats, with the greatest levels of suppression occurring at 35min and these lowest levels attained were with 30.6% and 29.24%, respectively. Furthermore, we found that sinoaortic denervation attenuated the suppressive effects of AVP (10µg/kg i.p.) on BAT sympathetic nerve activity. The greatest level of suppression was only 20.8% occurring at 35min after AVP. Therefore, these results indicate that the hypothermic effects of peripheral administration of AVP are partially mediated by the arterial baroreceptor reflex suppression of BAT sympathetic nerve activity and BAT thermogenesis.
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Affiliation(s)
- Yong-Lu Yang
- Thermoregulation and Inflammation Laboratory, Chengdu Medical College, Chengdu, Sichuan 610500, China.
| | - Xin Liu
- Department of Intensive Care Unit, First Hospital of Lanzhou University, Lanzhou, Gansu 730030, China
| | - Rong Luo
- Thermoregulation and Inflammation Laboratory, Chengdu Medical College, Chengdu, Sichuan 610500, China
| | - Jian-Hui Xu
- Thermoregulation and Inflammation Laboratory, Chengdu Medical College, Chengdu, Sichuan 610500, China
| | - Chang Liu
- Thermoregulation and Inflammation Laboratory, Chengdu Medical College, Chengdu, Sichuan 610500, China
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7
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Garretson JT, Szymanski LA, Schwartz GJ, Xue B, Ryu V, Bartness TJ. Lipolysis sensation by white fat afferent nerves triggers brown fat thermogenesis. Mol Metab 2016; 5:626-34. [PMID: 27656400 DOI: 10.1016/j.molmet.2016.06.013] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/07/2016] [Revised: 06/24/2016] [Accepted: 06/26/2016] [Indexed: 01/31/2023] Open
Abstract
Objective Metabolic challenges, such as a cold environment, stimulate sympathetic neural efferent activity to white adipose tissue (WAT) to drive lipolysis, thereby increasing the availability of free fatty acids as one source of fuel for brown adipose tissue (BAT) thermogenesis. WAT is also innervated by sensory nerve fibers that network to metabolic brain areas; moreover, activation of these afferents is reported to increase sympathetic nervous system outflow. However, the endogenous stimuli sufficient to drive WAT afferents during metabolic challenges as well as their functional relation to BAT thermogenesis remain unknown. Method We tested if local WAT lipolysis directly activates WAT afferent nerves, and then assessed whether this WAT sensory signal affected BAT thermogenesis in Siberian hamsters (Phodopus sungorus). Results 2-deoxyglucose, a sympathetic nervous system stimulant, caused β-adrenergic receptor dependent increases in inguinal WAT (IWAT) afferent neurophysiological activity. In addition, direct IWAT injections of the β3-AR agonist CL316,243 dose-dependently increased: 1) phosphorylation of IWAT hormone sensitive lipase, an indicator of SNS-stimulated lipolysis, 2) expression of the neuronal activation marker c-Fos in dorsal root ganglion neurons receiving sensory input from IWAT, and 3) IWAT afferent neurophysiological activity, an increase blocked by antilipolytic agent 3,5-dimethylpyrazole. Finally, we demonstrated that IWAT afferent activation by lipolysis triggers interscapular BAT thermogenesis through a neural link between these two tissues. Conclusions These data suggest IWAT lipolysis activates local IWAT afferents triggering a neural circuit from WAT to BAT that acutely induces BAT thermogenesis. Glucoprivation-induced lipolysis activates sensory nerves from white fat via β-adrenoreceptors. Lipolysis sensation by local afferent nerves innervating white fat is proposed. Lipid products of lipolysis are sufficient to activate sensory nerves from white fat. Stimulation of white fat afferents by lipolysis increases brown fat temperature. Findings illustrate functional neural connectivity between white and brown fat.
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