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Park S, Oh S, Kim N, Kim EK. HMBA ameliorates obesity by MYH9- and ACTG1-dependent regulation of hypothalamic neuropeptides. EMBO Mol Med 2023; 15:e18024. [PMID: 37984341 DOI: 10.15252/emmm.202318024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Revised: 10/19/2023] [Accepted: 10/27/2023] [Indexed: 11/22/2023] Open
Abstract
The global epidemic of obesity remains a daunting problem. Here, we report hexamethylene bisacetamide (HMBA) as a potent anti-obesity compound. Peripheral and central administration of HMBA to diet-induced obese mice regulated the expression of hypothalamic neuropeptides critical for energy balance, leading to beneficial metabolic effects such as anorexia and weight loss. We found that HMBA bound to MYH9 and ACTG1, which were required for the anti-obesity effects of HMBA in both NPY-expressing and POMC-expressing neurons. The binding of HMBA to MYH9 and ACTG1 elevated the expression of HEXIM1 and enhanced its interaction with MDM2, resulting in the dissociation of the HEXIM1-p53 complex in hypothalamic cells. Subsequently, the free HEXIM1 and p53 translocated to the nucleus, where they downregulated the transcription of orexigenic NPY, but p53 and acetylated histone 3 upregulated that of anorexigenic POMC. Our study points to a previously unappreciated efficacy of HMBA and reveals its mechanism of action in metabolic regulation, which may propose HMBA as a potential therapeutic strategy for obesity.
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Affiliation(s)
- Seokjae Park
- Department of Brain Sciences, Daegu Gyeongbuk Institute of Science and Technology, Daegu, Korea
- Neurometabolomics Research Center, Daegu Gyeongbuk Institute of Science and Technology, Daegu, Korea
| | - Sungjoon Oh
- Department of Brain Sciences, Daegu Gyeongbuk Institute of Science and Technology, Daegu, Korea
- Neurometabolomics Research Center, Daegu Gyeongbuk Institute of Science and Technology, Daegu, Korea
| | - Nayoun Kim
- Department of Brain Sciences, Daegu Gyeongbuk Institute of Science and Technology, Daegu, Korea
| | - Eun-Kyoung Kim
- Department of Brain Sciences, Daegu Gyeongbuk Institute of Science and Technology, Daegu, Korea
- Neurometabolomics Research Center, Daegu Gyeongbuk Institute of Science and Technology, Daegu, Korea
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2
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Han J, Liang X, Guo Y, Wu X, Li Z, Hong T. Agouti-related protein as the glucose signaling sensor in the central melanocortin circuits in regulating fish food intake. Front Endocrinol (Lausanne) 2022; 13:1010472. [PMID: 36387900 PMCID: PMC9663815 DOI: 10.3389/fendo.2022.1010472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Accepted: 10/17/2022] [Indexed: 11/05/2022] Open
Abstract
Agouti-related protein (AgRP) is a neuropeptide synthesized by AgRP/NPY neurons and transcribed as 132 amino acids in humans and 142 amino acids (AgRP1) in Japanese seabass (Lateolabrax maculatus) fish. AgRP neurons are activated by hormonal signals of energy deficits and inhibited by signals of energy surpluses and have been demonstrated to have the ability to sense the dynamics of blood glucose concentrations as the "glucose sensor" in mammals. It is widely recognized that AgRP is an endogenous antagonist of the melanocortin-3 and -4 receptors (MC3R and MC4R) in the hypothalamus, exhibiting potent orexigenic activity and control of energy homeostasis. Most fish, especially carnivorous fish, cannot make efficient use of carbohydrates. When carbohydrates like corn or wheat bran are added as energy sources, they often cause feeding inhibition and metabolic diseases. When fishmeal is replaced by plant protein, this does not completely eliminate carbs, limiting the utilization of carbohydrates and plant proteins in aquaculture. Our previous study showed that AgRP, and not neuropeptide Y (NPY) is the principal protein molecule that correlates well with feeding behavior in Japanese seabass from anorexia to adaptation. The Ghrelin/Leptin-mTOR-S6K1-NPY/AgRP/POMC feed intake regulatory pathway responds to the plant-oriented protein which contains glucose. However, its regulatory function and mechanism are still not clear. This review offers an integrative overview of how glucose signals converge on a molecular level in AgRP neurons of the arcuate nucleus of the hypothalamus. This is in order to control fish food intake and energy homeostasis.
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Affiliation(s)
- Juan Han
- Institute of Food and Nutrition Development, Ministry of Agriculture and Rural Affairs, Beijing, China
| | - Xiaofang Liang
- Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing, China
- *Correspondence: Xiaofang Liang, ; Yanzhi Guo,
| | - Yanzhi Guo
- Department of Research Management, Chinese Academy of Agricultural Sciences, Beijing, China
- *Correspondence: Xiaofang Liang, ; Yanzhi Guo,
| | - Xiaoliang Wu
- Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Ziqi Li
- Institute of Food and Nutrition Development, Ministry of Agriculture and Rural Affairs, Beijing, China
| | - Tiannuo Hong
- Institute of Food and Nutrition Development, Ministry of Agriculture and Rural Affairs, Beijing, China
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3
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Rosita R, Yueniwati Y, Endharti AT, Widodo MA. High-Glucose and Free Fatty Acid-Induced Adipocytes Generate Increasing of HMGB1 and Reduced GLUT4 Expression. Open Access Maced J Med Sci 2021. [DOI: 10.3889/oamjms.2021.7199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Background
High-mobility group box 1 protein (HMGB1) is released from necrotic adipocytes into the extracellular milieu as an inflammatory alarmin in obesity. Although the impact of excess nutrient on adipocytes is well known, it is not clear how specific its component drive cell-size and damaged of adipocytes, and how this relates to the risk of insulin resistance.
Objectives
The aim of this study was to determine HMGB1 level in adipocytes cultures after high glucose and/or FFA exposures and to assess GLUT4 expression. We determined cellular features of adipocytes that correlates to HMGB1 released and insulin resistance.
Methods
Differentiated adipocytes were exposed to high glucose and/or FFAs for 7 days. ELISA was performed on supernatant to assess the HMGB1 level. Total GLUT4 expression were quantified by immunofluorescense.
Results
High glucose and FFA-exposed cells have significant increase of HMGB1 level with decreased of cell size and necrotic adipocytes features. The total GLUT4 were reduced in HG-cells (p <0,045), but not in FFA cells. Hypertrophic adipocytes (p <0.05) and slight decrease of GLUT4 expression were showed on HG+FFA exposures with no increase of HMGB1 level. There was a significant correlation between cell size and HMGB1 level (R -0,637, p < 0.026)
Conclusion
The expression level studies between high glucose, FFA, and a combination of both on adipocytes results strongly suggest that high glucose is more damaging to adipocyte compared to FFA. Nevertheless, the combination of the two causes adipocyte dysfunction with general features of adipose tissue in obesity, suggested it can be used as a hypertrophic adipocytes model to study obesity in vitro.
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4
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Lieu CV, Loganathan N, Belsham DD. Mechanisms Driving Palmitate-Mediated Neuronal Dysregulation in the Hypothalamus. Cells 2021; 10:3120. [PMID: 34831343 PMCID: PMC8617942 DOI: 10.3390/cells10113120] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Revised: 11/03/2021] [Accepted: 11/04/2021] [Indexed: 12/17/2022] Open
Abstract
The hypothalamus maintains whole-body homeostasis by integrating information from circulating hormones, nutrients and signaling molecules. Distinct neuronal subpopulations that express and secrete unique neuropeptides execute the individual functions of the hypothalamus, including, but not limited to, the regulation of energy homeostasis, reproduction and circadian rhythms. Alterations at the hypothalamic level can lead to a myriad of diseases, such as type 2 diabetes mellitus, obesity, and infertility. The excessive consumption of saturated fatty acids can induce neuroinflammation, endoplasmic reticulum stress, and resistance to peripheral signals, ultimately leading to hyperphagia, obesity, impaired reproductive function and disturbed circadian rhythms. This review focuses on the how the changes in the underlying molecular mechanisms caused by palmitate exposure, the most commonly consumed saturated fatty acid, and the potential involvement of microRNAs, a class of non-coding RNA molecules that regulate gene expression post-transcriptionally, can result in detrimental alterations in protein expression and content. Studying the involvement of microRNAs in hypothalamic function holds immense potential, as these molecular markers are quickly proving to be valuable tools in the diagnosis and treatment of metabolic disease.
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Affiliation(s)
- Calvin V. Lieu
- Department of Physiology, University of Toronto, Medical Sciences Building 3247A, 1 King’s College Circle, Toronto, ON M5S 1A8, Canada; (C.V.L.); (N.L.)
| | - Neruja Loganathan
- Department of Physiology, University of Toronto, Medical Sciences Building 3247A, 1 King’s College Circle, Toronto, ON M5S 1A8, Canada; (C.V.L.); (N.L.)
| | - Denise D. Belsham
- Department of Physiology, University of Toronto, Medical Sciences Building 3247A, 1 King’s College Circle, Toronto, ON M5S 1A8, Canada; (C.V.L.); (N.L.)
- Departments of Obstetrics/Gynecology and Medicine, University of Toronto, Toronto, ON M5S 1A8, Canada
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5
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Roh JS, Jeong H, Lee B, Song BW, Han SJ, Sohn DH, Lee SG. Mirodenafil ameliorates skin fibrosis in bleomycin-induced mouse model of systemic sclerosis. Anim Cells Syst (Seoul) 2021; 25:387-395. [PMID: 35059138 PMCID: PMC8765282 DOI: 10.1080/19768354.2021.1995486] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Systemic sclerosis (SSc) is a chronic autoimmune disease characterized by fibrosis of the skin and internal organs. Despite the recent advances in the pathogenesis and treatment of SSc, effective therapies for fibrosis caused by SSc have not yet been established. In this study, we investigated the potential role of mirodenafil, a potent phosphodiesterase 5 (PDE5) inhibitor, in the treatment of fibrosis in SSc. We used a bleomycin (BLM)-induced SSc mouse model to mimic the typical features of fibrosis in human SSc and examined the dermal thickness to assess the degree of skin fibrosis after staining with hematoxylin and eosin or Masson’s trichrome stains. The effect of mirodenafil on the expression of profibrotic genes was also analyzed by treating fibroblasts with transforming growth factor (TGF)-β and mirodenafil. We showed that mirodenafil ameliorated dermal fibrosis and downregulated the protein levels of fibrosis markers including COL1A1 and α-SMA in the BLM-induced SSc mouse model. Further, using mouse embryonic fibroblasts and human lung fibroblasts, we demonstrated that the expression of collagen and profibrotic genes was reduced by treatment with mirodenafil. Finally, we showed that mirodenafil inhibited TGF-β-induced phosphorylation of Smad2/3 in fibroblasts, which suggested that this drug may ameliorate fibrosis by suppressing the TGF-β/Smad signaling pathway. Our findings suggest that mirodenafil possesses a therapeutic potential for treating fibrosis in SSc.
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Affiliation(s)
- Jong Seong Roh
- Department of Herbal Prescription, College of Korean Medicine, Daegu Haany University, Gyeongsan, Republic of Korea
| | - Hoim Jeong
- Department of Microbiology and Immunology, Pusan National University School of Medicine, Yangsan, Republic of Korea
| | - Beomgu Lee
- Department of Microbiology and Immunology, Pusan National University School of Medicine, Yangsan, Republic of Korea
| | - Byung Wook Song
- Biomedical Research Institute, Pusan National University Hospital, Busan, Republic of Korea
- Division of Rheumatology, Department of Internal Medicine, Pusan National University School of Medicine, Pusan National University Hospital, Busan, Republic of Korea
| | - Seung Jin Han
- Department of Biotechnology, Inje University, Gimhae, Republic of Korea
- Institute of Digital Anti-Aging Healthcare, Inje University, Gimhae, Republic of Korea
| | - Dong Hyun Sohn
- Department of Microbiology and Immunology, Pusan National University School of Medicine, Yangsan, Republic of Korea
| | - Seung-Geun Lee
- Biomedical Research Institute, Pusan National University Hospital, Busan, Republic of Korea
- Division of Rheumatology, Department of Internal Medicine, Pusan National University School of Medicine, Pusan National University Hospital, Busan, Republic of Korea
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Decanoic Acid Stimulates Autophagy in D. discoideum. Cells 2021; 10:cells10112946. [PMID: 34831171 PMCID: PMC8616062 DOI: 10.3390/cells10112946] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Revised: 10/20/2021] [Accepted: 10/25/2021] [Indexed: 12/22/2022] Open
Abstract
Ketogenic diets, used in epilepsy treatment, are considered to work through reduced glucose and ketone generation to regulate a range of cellular process including autophagy induction. Recent studies into the medium-chain triglyceride (MCT) ketogenic diet have suggested that medium-chain fatty acids (MCFAs) provided in the diet, decanoic acid and octanoic acid, cause specific therapeutic effects independent of glucose reduction, although a role in autophagy has not been investigated. Both autophagy and MCFAs have been widely studied in Dictyostelium, with findings providing important advances in the study of autophagy-related pathologies such as neurodegenerative diseases. Here, we utilize this model to analyze a role for MCFAs in regulating autophagy. We show that treatment with decanoic acid but not octanoic acid induces autophagosome formation and modulates autophagic flux in high glucose conditions. To investigate this effect, decanoic acid, but not octanoic acid, was found to induce the expression of autophagy-inducing proteins (Atg1 and Atg8), providing a mechanism for this effect. Finally, we demonstrate a range of related fatty acid derivatives with seizure control activity, 4BCCA, 4EOA, and Epilim (valproic acid), also function to induce autophagosome formation in this model. Thus, our data suggest that decanoic acid and related compounds may provide a less-restrictive therapeutic approach to activate autophagy.
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7
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Choi Y, Song MJ, Jung WJ, Jeong H, Park S, Yang B, Lee EC, Joo JS, Choi D, Koo SH, Kim EK, Nam KT, Kim HP. Liver-Specific Deletion of Mouse CTCF Leads to Hepatic Steatosis via Augmented PPARγ Signaling. Cell Mol Gastroenterol Hepatol 2021; 12:1761-1787. [PMID: 34358714 PMCID: PMC8551791 DOI: 10.1016/j.jcmgh.2021.07.016] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Revised: 07/26/2021] [Accepted: 07/27/2021] [Indexed: 12/12/2022]
Abstract
BACKGROUND & AIMS The liver is the major organ for metabolizing lipids, and malfunction of the liver leads to various diseases. Nonalcoholic fatty liver disease is rapidly becoming a major health concern worldwide and is characterized by abnormal retention of excess lipids in the liver. CCCTC-binding factor (CTCF) is a highly conserved zinc finger protein that regulates higher-order chromatin organization and is involved in various gene regulation processes. Here, we sought to determine the physiological role of CTCF in hepatic lipid metabolism. METHODS We generated liver-specific, CTCF-ablated and/or CD36 whole-body knockout mice. Overexpression or knockdown of peroxisome proliferator-activated receptor (PPAR)γ in the liver was achieved using adenovirus. Mice were examined for development of hepatic steatosis and inflammation. RNA sequencing was performed to identify genes affected by CTCF depletion. Genome-wide occupancy of H3K27 acetylation, PPARγ, and CTCF were analyzed by chromatin immunoprecipitation sequencing. Genome-wide chromatin interactions were analyzed by in situ Hi-C. RESULTS Liver-specific, CTCF-deficient mice developed hepatic steatosis and inflammation when fed a standard chow diet. Global analysis of the transcriptome and enhancer landscape revealed that CTCF-depleted liver showed enhanced accumulation of PPARγ in the nucleus, which leads to increased expression of its downstream target genes, including fat storage-related gene CD36, which is involved in the lipid metabolic process. Hepatic steatosis developed in liver-specific, CTCF-deficient mice was ameliorated by repression of PPARγ via pharmacologic blockade or adenovirus-mediated knockdown, but hardly rescued by additional knockout of CD36. CONCLUSIONS Our data indicate that liver-specific deletion of CTCF leads to hepatosteatosis through augmented PPARγ DNA-binding activity, which up-regulates its downstream target genes associated with the lipid metabolic process.
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Affiliation(s)
- Yeeun Choi
- Department of Environmental Medical Biology, Institute of Tropical Medicine, Seoul, Korea; Brain Korea 21 Plus Project for Medical Science, Seoul, Korea
| | - Min-Ji Song
- Department of Environmental Medical Biology, Institute of Tropical Medicine, Seoul, Korea
| | - Woong-Jae Jung
- Department of Environmental Medical Biology, Institute of Tropical Medicine, Seoul, Korea; Department of Bioinformatics, Graduate School of Soongsil University, Seoul, Korea
| | - Haengdueng Jeong
- Brain Korea 21 Plus Project for Medical Science, Seoul, Korea; Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul, Korea
| | - Seokjae Park
- Department of Brain and Cognitive Sciences, Daegu Gyeongbuk Institute of Science and Technology, Daegu, Korea; Neurometabolomics Research Center, Daegu Gyeongbuk Institute of Science and Technology, Daegu, Korea
| | - Bobae Yang
- Department of Environmental Medical Biology, Institute of Tropical Medicine, Seoul, Korea; Brain Korea 21 Plus Project for Medical Science, Seoul, Korea
| | - Eun-Chong Lee
- Department of Environmental Medical Biology, Institute of Tropical Medicine, Seoul, Korea; Brain Korea 21 Plus Project for Medical Science, Seoul, Korea
| | - Jung-Sik Joo
- Department of Environmental Medical Biology, Institute of Tropical Medicine, Seoul, Korea; Brain Korea 21 Plus Project for Medical Science, Seoul, Korea
| | - Dahee Choi
- Division of Life Sciences, Korea University, Seoul, Korea
| | - Seung-Hoi Koo
- Division of Life Sciences, Korea University, Seoul, Korea
| | - Eun-Kyoung Kim
- Department of Brain and Cognitive Sciences, Daegu Gyeongbuk Institute of Science and Technology, Daegu, Korea; Neurometabolomics Research Center, Daegu Gyeongbuk Institute of Science and Technology, Daegu, Korea
| | - Ki Taek Nam
- Brain Korea 21 Plus Project for Medical Science, Seoul, Korea; Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul, Korea
| | - Hyoung-Pyo Kim
- Department of Environmental Medical Biology, Institute of Tropical Medicine, Seoul, Korea; Brain Korea 21 Plus Project for Medical Science, Seoul, Korea.
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8
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Raj SD, Fann DY, Wong E, Kennedy BK. Natural products as geroprotectors: An autophagy perspective. Med Res Rev 2021; 41:3118-3155. [PMID: 33973253 DOI: 10.1002/med.21815] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Revised: 02/09/2021] [Accepted: 04/19/2021] [Indexed: 12/19/2022]
Abstract
Over the past decade, significant attention has been given to repurposing Food and Drug Administration approved drugs to treat age-related diseases. In contrast, less consideration has been given to natural bioactive compounds. Consequently, there have been limited attempts to translate these compounds. Autophagy is a fundamental biological pathway linked to aging, and numerous strategies to enhance autophagy have been shown to extend lifespan. Interestingly, there are a number of natural products that are reported to modulate autophagy, and here we describe a number of them that activate autophagy through diverse molecular and cellular mechanisms. Among these, Urolithin A, Spermidine, Resveratrol, Fatty Acids and Phospholipids, Trehalose and Lithium are featured in detail. Finally, we outline possible strategies to optimise and increase the translatability of natural products, with the overall aim of delaying the ageing process and improving human healthspan.
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Affiliation(s)
- Stephen D Raj
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.,Healthy Longevity Translational Research Program, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.,Centre For Healthy Longevity, National University Health System, National University of Singapore, Singapore
| | - David Y Fann
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.,Healthy Longevity Translational Research Program, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.,Centre For Healthy Longevity, National University Health System, National University of Singapore, Singapore
| | - Esther Wong
- Healthy Longevity Translational Research Program, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.,Centre For Healthy Longevity, National University Health System, National University of Singapore, Singapore.,Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Brian K Kennedy
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.,Healthy Longevity Translational Research Program, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.,Centre For Healthy Longevity, National University Health System, National University of Singapore, Singapore.,Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.,Agency for Science, Technology and Research (A*STAR), Singapore Institute for Clinical Sciences, Singapore
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9
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Oviedo-Ojeda MF, Roque-Jiménez JA, Whalin M, Lee-Rangel HA, Relling AE. Effect of supplementation with different fatty acid profile to the dam in early gestation and to the offspring on the finishing diet on offspring growth and hypothalamus mRNA expression in sheep. J Anim Sci 2021; 99:6153448. [PMID: 33640974 DOI: 10.1093/jas/skab064] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Accepted: 02/24/2021] [Indexed: 12/12/2022] Open
Abstract
Supplementation with omega-3 and omega-9 fatty acids (FA) during late gestation regulates offspring development; however, their effect in the first third of gestation is unknown in sheep. The objective of this experiment was to evaluate the effects of the maternal supplementation with an enriched source of monounsaturated FA (MUFA) or an enriched source of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) during the first third of gestation on productive performance on ewes and offspring, and hypothalamic neuropeptides on offspring. Seventy-nine post-weaning lambs, born of sheep supplemented in the first third of gestation with 1.61% Ca salts rich with MUFA or EPA+DHA (dam supplementation, DS), were distributed in a 2×2 factorial arrangement of treatments to finishing diets containing 1.48% of Ca salts of MUFA or EPA+DHA (lamb supplementation, LS). The finishing period of the offspring lasted for 56 d. During the finishing period dry matter intake (DMI, daily) and body weight (BW) were recorded. Plasma was collected for metabolites analysis. Twenty-four lambs were slaughtered, and hypothalamus was collected for mRNA expression of hormone receptors, neuropeptides, and lipid transport genes. The data were analyzed with a mixed model in SAS (9.4) using repeated measurements, when needed. There was a DS×LS interaction for BW (P = 0.10) where LS with EPA+DHA born from DS with MUFA were heavier than the other 3 treatments. Lambs born from DS with MUFA have a greater DMI (P < 0.01) than the offspring born from DS with EPA+DHA. Lambs born from MUFA supplemented dams had a greater (P ≤ 0.05) hypothalamus mRNA expression for cocaine and amphetamine regulated transcript, growth hormone receptor, metastasis suppressor 1, leptin receptor, pro-opiomelanocortin, and Neuropeptide Y. These results indicate that growth depends not on the type of FA during the finishing phase but the interaction of different sources of FA ad different stages. Also, supplementation with FA during early pregnancy changes productive performance and neuropeptides' mRNA expression of lambs independently of the finishing diet.
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Affiliation(s)
- Mario Francisco Oviedo-Ojeda
- Department of Animal Sciences, The Ohio State University, Ohio Agricultural Research and Development Center (OARDC), Wooster, OH 44691, USA.,Universidad Autónoma de San Luis Potosí, Facultad de Agronomía y Veterinaria, San Luis Potosí 78175, México
| | - José Alejandro Roque-Jiménez
- Department of Animal Sciences, The Ohio State University, Ohio Agricultural Research and Development Center (OARDC), Wooster, OH 44691, USA.,Universidad Autónoma de San Luis Potosí, Facultad de Agronomía y Veterinaria, San Luis Potosí 78175, México
| | - Megan Whalin
- Department of Animal Sciences, The Ohio State University, Ohio Agricultural Research and Development Center (OARDC), Wooster, OH 44691, USA
| | - Héctor Aarón Lee-Rangel
- Universidad Autónoma de San Luis Potosí, Facultad de Agronomía y Veterinaria, San Luis Potosí 78175, México
| | - Alejandro Enrique Relling
- Department of Animal Sciences, The Ohio State University, Ohio Agricultural Research and Development Center (OARDC), Wooster, OH 44691, USA
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Lim Y, Kim S, Kim EK. Palmitate reduces starvation-induced ER stress by inhibiting ER-phagy in hypothalamic cells. Mol Brain 2021; 14:65. [PMID: 33823883 PMCID: PMC8025501 DOI: 10.1186/s13041-021-00777-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Accepted: 03/30/2021] [Indexed: 12/11/2022] Open
Abstract
Palmitate is a saturated fatty acid that is well known to induce endoplasmic reticulum (ER) stress and autophagy. A high-fat diet increases the palmitate level in the hypothalamus, the main region of the brain regulating energy metabolism. Interestingly, hypothalamic palmitate level is also increased under starvation, urging the study to distinguish the effects of elevated hypothalamic palmitate level under different nutrient conditions. Herein, we show that ER-phagy (ER-targeted selective autophagy) is required for progress of ER stress and that palmitate decreases ER stress by inhibiting ER-phagy in hypothalamic cells under starvation. Palmitate inhibited starvation-induced ER-phagy by increasing the level of B-cell lymphoma 2 (Bcl-2) protein, which inhibits autophagy initiation. These findings suggest that, unlike the induction of ER stress under nutrient-rich conditions, palmitate protects hypothalamic cells from starvation-induced stress by inhibiting ER-phagy.
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Affiliation(s)
- Yun Lim
- Department of Brain and Cognitive Sciences, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, 42988, Republic of Korea
| | - Seolsong Kim
- Department of Brain and Cognitive Sciences, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, 42988, Republic of Korea
| | - Eun-Kyoung Kim
- Department of Brain and Cognitive Sciences, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, 42988, Republic of Korea. .,Neurometabolomics Research Center, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, 42988, Republic of Korea.
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11
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Reginato A, Siqueira BP, Miyamoto JÉ, Portovedo M, Costa SDO, de Fante T, Rodrigues HG, Ignácio-Souza LM, Torsoni MA, Torsoni AS, Le Stunff H, Belsham DD, Milanski M. Acute effects of fatty acids on autophagy in NPY neurones. J Neuroendocrinol 2020; 32:e12900. [PMID: 33040385 DOI: 10.1111/jne.12900] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/09/2020] [Revised: 08/15/2020] [Accepted: 08/19/2020] [Indexed: 12/13/2022]
Abstract
High-fat diet (HFD) feeding is deleterious to hypothalamic tissue, leading to inflammation and lipotoxicity, as well as contributing to central insulin resistance. Autophagy is a process that restores cellular homeostasis by degrading malfunctioning organelles and proteins. Chronic HFD-feeding down-regulates hypothalamic autophagy. However, the effects of short-term HFD-feeding and the saturated fatty acid palmitate (PA) on hypothalamic autophagy and in neurones that express neuropeptide Y (NPY) and agouti-related peptide remains unknown. Therefore, we assessed hypothalamic autophagy after 1 and 3 days of HFD-feeding. We also injected PA i.c.v and analysed the modulation of autophagy in hypothalamic tissue. Both interventions resulted in changes in autophagy-related gene profiles without significant differences in protein content of p62 and LC3B-II, markers of the autophagy pathway. When we assessed native NPY neurones in brain slices from PA-treated animals, we observed increased levels of Atg7 and LC3B protein in response to PA treatment, indicating the induction of autophagy. We then tested the direct effects of fatty acids using the immortalised hypothalamic NPY-expressing neuronal cell model mHypoE-46. We found that PA, but not palmitoleate (PO) (a monounsaturated fatty acid), was able to induce autophagy. Co-treatment with PA and PO was able to block the PA-mediated induction of autophagy, as assessed by flow cytometry. When the de novo ceramide synthesis pathway was blocked with myriocin pre-treatment, we observed a decrease in PA-mediated induction of autophagy, although there was no change with the toll-like receptor 4 inhibitor, TAK-242. Taken together, these findings provide evidence that saturated and unsaturated fatty acids can differentially regulate hypothalamic autophagy and that ceramide synthesis may be an important mediator of those effects. Understanding the mechanisms by which dietary fats affect autophagy in neurones involved in the control of energy homeostasis will provide potential new pathways for targeting and containing the obesity epidemic.
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Affiliation(s)
- Andressa Reginato
- Faculty of Applied Science, University of Campinas, Campinas, Brazil
- Obesity and Comorbidities Research Center, University of Campinas, UNICAMP, Campinas, Brazil
| | - Beatriz Piatezzi Siqueira
- Faculty of Applied Science, University of Campinas, Campinas, Brazil
- Obesity and Comorbidities Research Center, University of Campinas, UNICAMP, Campinas, Brazil
| | - Josiane Érica Miyamoto
- Faculty of Applied Science, University of Campinas, Campinas, Brazil
- Obesity and Comorbidities Research Center, University of Campinas, UNICAMP, Campinas, Brazil
| | - Mariana Portovedo
- Faculty of Applied Science, University of Campinas, Campinas, Brazil
- Obesity and Comorbidities Research Center, University of Campinas, UNICAMP, Campinas, Brazil
| | - Suleyma de Oliveira Costa
- Faculty of Applied Science, University of Campinas, Campinas, Brazil
- Obesity and Comorbidities Research Center, University of Campinas, UNICAMP, Campinas, Brazil
| | - Thaís de Fante
- Faculty of Applied Science, University of Campinas, Campinas, Brazil
- Obesity and Comorbidities Research Center, University of Campinas, UNICAMP, Campinas, Brazil
| | | | - Letícia Martins Ignácio-Souza
- Faculty of Applied Science, University of Campinas, Campinas, Brazil
- Obesity and Comorbidities Research Center, University of Campinas, UNICAMP, Campinas, Brazil
| | - Márcio Alberto Torsoni
- Faculty of Applied Science, University of Campinas, Campinas, Brazil
- Obesity and Comorbidities Research Center, University of Campinas, UNICAMP, Campinas, Brazil
| | - Adriana Souza Torsoni
- Faculty of Applied Science, University of Campinas, Campinas, Brazil
- Obesity and Comorbidities Research Center, University of Campinas, UNICAMP, Campinas, Brazil
| | - Hervé Le Stunff
- Neuroscience Institute, Université Paris Saclay, Paris, France
| | - Denise D Belsham
- Departments of Physiology, Ob/Gyn, and Medicine, University of Toronto, Toronto, ON, Canada
| | - Marciane Milanski
- Faculty of Applied Science, University of Campinas, Campinas, Brazil
- Obesity and Comorbidities Research Center, University of Campinas, UNICAMP, Campinas, Brazil
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