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Simino LAP, Baqueiro MN, Panzarin C, Lopes PKF, Góis MM, Simabuco FM, Ignácio-Souza LM, Milanski M, Ross MG, Desai M, Torsoni AS, Torsoni MA. Hypothalamic α7 nicotinic acetylcholine receptor (α7nAChR) is downregulated by TNFα-induced Let-7 overexpression driven by fatty acids. FASEB J 2023; 37:e23120. [PMID: 37527279 DOI: 10.1096/fj.202300439rr] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Revised: 07/10/2023] [Accepted: 07/19/2023] [Indexed: 08/03/2023]
Abstract
The α7nAChR is crucial to the anti-inflammatory reflex, and to the expression of neuropeptides that control food intake, but its expression can be decreased by environmental factors. We aimed to investigate whether microRNA modulation could be an underlying mechanism in the α7nAchR downregulation in mouse hypothalamus following a short-term exposure to an obesogenic diet. Bioinformatic analysis revealed Let-7 microRNAs as candidates to regulate Chrna7, which was confirmed by the luciferase assay. Mice exposed to an obesogenic diet for 3 days had increased Let-7a and decreased α7nAChR levels, accompanied by hypothalamic fatty acids and TNFα content. Hypothalamic neuronal cells exposed to fatty acids presented higher Let-7a and TNFα levels and lower Chrna7 expression, but when the cells were pre-treated with TLR4 inhibitor, Let-7a, TNFα, and Chrna7 were rescued to normal levels. Thus, the fatty acids overload trigger TNFα-induced Let-7 overexpression in hypothalamic neuronal cells, which negatively regulates α7nAChR, an event that can be related to hyperphagia and obesity predisposition in mice.
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Affiliation(s)
- Laís A P Simino
- Laboratory of Metabolic Disorders (Labdime), School of Applied Sciences, University of Campinas (UNICAMP), Campinas, Brazil
| | - Mayara N Baqueiro
- Laboratory of Metabolic Disorders (Labdime), School of Applied Sciences, University of Campinas (UNICAMP), Campinas, Brazil
| | - Carolina Panzarin
- Laboratory of Metabolic Disorders (Labdime), School of Applied Sciences, University of Campinas (UNICAMP), Campinas, Brazil
| | - Priscilla K F Lopes
- Laboratory of Metabolic Disorders (Labdime), School of Applied Sciences, University of Campinas (UNICAMP), Campinas, Brazil
| | - Mariana M Góis
- Multidisciplinary Laboratory of Food and Health (Labmas), School of Applied Sciences (FCA), University of Campinas (UNICAMP), Campinas, Brazil
| | - Fernando M Simabuco
- Multidisciplinary Laboratory of Food and Health (Labmas), School of Applied Sciences (FCA), University of Campinas (UNICAMP), Campinas, Brazil
| | - Letícia M Ignácio-Souza
- Laboratory of Metabolic Disorders (Labdime), School of Applied Sciences, University of Campinas (UNICAMP), Campinas, Brazil
- Obesity and Comorbidities Research Center, University of Campinas (UNICAMP), Campinas, Brazil
| | - Marciane Milanski
- Laboratory of Metabolic Disorders (Labdime), School of Applied Sciences, University of Campinas (UNICAMP), Campinas, Brazil
- Obesity and Comorbidities Research Center, University of Campinas (UNICAMP), Campinas, Brazil
| | - Michael G Ross
- The Lundquist Institute, David Geffen School of Medicine at Harbor - UCLA Medical Center, UCLA, Los Angeles, California, USA
| | - Mina Desai
- The Lundquist Institute, David Geffen School of Medicine at Harbor - UCLA Medical Center, UCLA, Los Angeles, California, USA
| | - Adriana S Torsoni
- Laboratory of Metabolic Disorders (Labdime), School of Applied Sciences, University of Campinas (UNICAMP), Campinas, Brazil
- Obesity and Comorbidities Research Center, University of Campinas (UNICAMP), Campinas, Brazil
| | - Marcio A Torsoni
- Laboratory of Metabolic Disorders (Labdime), School of Applied Sciences, University of Campinas (UNICAMP), Campinas, Brazil
- Obesity and Comorbidities Research Center, University of Campinas (UNICAMP), Campinas, Brazil
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Simino LAP, Panzarin C, Fontana MF, de Fante T, Geraldo MV, Ignácio-Souza LM, Milanski M, Torsoni MA, Ross MG, Desai M, Torsoni AS. MicroRNA Let-7 targets AMPK and impairs hepatic lipid metabolism in offspring of maternal obese pregnancies. Sci Rep 2021; 11:8980. [PMID: 33903707 PMCID: PMC8076304 DOI: 10.1038/s41598-021-88518-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Accepted: 04/07/2021] [Indexed: 12/12/2022] Open
Abstract
Nutritional status during gestation may lead to a phenomenon known as metabolic programming, which can be triggered by epigenetic mechanisms. The Let-7 family of microRNAs were one of the first to be discovered, and are closely related to metabolic processes. Bioinformatic analysis revealed that Prkaa2, the gene that encodes AMPK α2, is a predicted target of Let-7. Here we aimed to investigate whether Let-7 has a role in AMPKα2 levels in the NAFLD development in the offspring programmed by maternal obesity. Let-7 levels were upregulated in the liver of newborn mice from obese dams, while the levels of Prkaa2 were downregulated. Let-7 levels strongly correlated with serum glucose, insulin and NEFA, and in vitro treatment of AML12 with glucose and NEFA lead to higher Let-7 expression. Transfection of Let-7a mimic lead to downregulation of AMPKα2 levels, while the transfection with Let-7a inhibitor impaired both NEFA-mediated reduction of Prkaa2 levels and the fat accumulation driven by NEFA. The transfection of Let-7a inhibitor in ex-vivo liver slices from the offspring of obese dams restored phospho-AMPKα2 levels. In summary, Let-7a appears to regulate hepatic AMPKα2 protein levels and lead to the early hepatic metabolic disturbances in the offspring of obese dams.
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Affiliation(s)
- Laís A P Simino
- Laboratory of Metabolic Disorders (Labdime) - Faculty of Applied Sciences (FCA), University of Campinas (UNICAMP), 1300, Pedro Zaccaria St, Limeira, SP, 13484-350, Brazil.
| | - Carolina Panzarin
- Laboratory of Metabolic Disorders (Labdime) - Faculty of Applied Sciences (FCA), University of Campinas (UNICAMP), 1300, Pedro Zaccaria St, Limeira, SP, 13484-350, Brazil
| | - Marina F Fontana
- Laboratory of Metabolic Disorders (Labdime) - Faculty of Applied Sciences (FCA), University of Campinas (UNICAMP), 1300, Pedro Zaccaria St, Limeira, SP, 13484-350, Brazil
| | - Thais de Fante
- Laboratory of Metabolic Disorders (Labdime) - Faculty of Applied Sciences (FCA), University of Campinas (UNICAMP), 1300, Pedro Zaccaria St, Limeira, SP, 13484-350, Brazil
| | - Murilo V Geraldo
- Institute of Biology (IB), University of Campinas (UNICAMP), Campinas, SP, Brazil
| | - Letícia M Ignácio-Souza
- Laboratory of Metabolic Disorders (Labdime) - Faculty of Applied Sciences (FCA), University of Campinas (UNICAMP), 1300, Pedro Zaccaria St, Limeira, SP, 13484-350, Brazil
| | - Marciane Milanski
- Laboratory of Metabolic Disorders (Labdime) - Faculty of Applied Sciences (FCA), University of Campinas (UNICAMP), 1300, Pedro Zaccaria St, Limeira, SP, 13484-350, Brazil
| | - Marcio A Torsoni
- Laboratory of Metabolic Disorders (Labdime) - Faculty of Applied Sciences (FCA), University of Campinas (UNICAMP), 1300, Pedro Zaccaria St, Limeira, SP, 13484-350, Brazil
| | - Michael G Ross
- The Lundquist Institute and David Geffen School of Medicine at Harbor-UCLA Medical Center, University of California, Los Angeles, CA, USA
| | - Mina Desai
- The Lundquist Institute and David Geffen School of Medicine at Harbor-UCLA Medical Center, University of California, Los Angeles, CA, USA
| | - Adriana S Torsoni
- Laboratory of Metabolic Disorders (Labdime) - Faculty of Applied Sciences (FCA), University of Campinas (UNICAMP), 1300, Pedro Zaccaria St, Limeira, SP, 13484-350, Brazil
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Portovedo M, Reginato A, Miyamoto JÉ, Simino LA, Hakim MP, Campana M, Leal RF, Ignácio-Souza LM, Torsoni MA, Magnan C, Le Stunff H, Torsoni AS, Milanski M. Lipid excess affects chaperone-mediated autophagy in hypothalamus. Biochimie 2020; 176:110-116. [PMID: 32623049 DOI: 10.1016/j.biochi.2020.06.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [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: 03/09/2020] [Revised: 06/16/2020] [Accepted: 06/18/2020] [Indexed: 01/15/2023]
Abstract
Obesity is a major health problem worldwide. Overweight and obesity directly affect health-related quality of life and also have an important economic impact on healthcare systems. In experimental models, obesity leads to hypothalamic inflammation and loss of metabolic homeostasis. It is known that macroautophagy is decreased in the hypothalamus of obese mice but the role of chaperone-mediated autophagy is still unknown. In this study, we aimed to investigate the role of hypothalamic chaperone-mediated autophagy in response to high-fat diet and also the direct effect of palmitate on hypothalamic neurons. Mice received chow or high-fat diet for 3 days or 1 week. At the end of the experimental protocol, chaperone-mediated autophagy in hypothalamus was investigated, as well as cytokines expression. In other set of experiments, neuronal cell lines were treated with palmitic acid, a saturated fatty acid. We show that chaperone-mediated autophagy is differently regulated in response to high-fat diet intake for 3 days or 1 week. Also, when hypothalamic neurons are directly exposed to palmitate there is activation of chaperone-mediated autophagy. High-fat diet causes hypothalamic inflammation concomitantly to changes in the content of chaperone-mediated autophagy machinery. It remains to be studied the direct role of inflammation and lipids itself on the activation of chaperone-mediated autophagy in the hypothalamus in vivo and also the neuronal implications of chaperone-mediated autophagy inhibition in response to obesity.
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Affiliation(s)
- M Portovedo
- Laboratory of Metabolic Disorders, Faculty of Applied Sciences, UNICAMP, Limeira, 13484-350, Brazil
| | - A Reginato
- Laboratory of Metabolic Disorders, Faculty of Applied Sciences, UNICAMP, Limeira, 13484-350, Brazil
| | - J É Miyamoto
- Laboratory of Metabolic Disorders, Faculty of Applied Sciences, UNICAMP, Limeira, 13484-350, Brazil
| | - L A Simino
- Laboratory of Metabolic Disorders, Faculty of Applied Sciences, UNICAMP, Limeira, 13484-350, Brazil
| | - M P Hakim
- Laboratory of Metabolic Disorders, Faculty of Applied Sciences, UNICAMP, Limeira, 13484-350, Brazil
| | - M Campana
- Université de Paris, BFA, UMR 8251, CNRS, F-75013, Paris, France
| | - R F Leal
- IBD Research Laboratory, Colorectal Surgery Unit, Department of Surgery, School of Medical Sciences, UNICAMP, Campinas, 13083-878, Brazil
| | - L M Ignácio-Souza
- Laboratory of Metabolic Disorders, Faculty of Applied Sciences, UNICAMP, Limeira, 13484-350, Brazil
| | - M A Torsoni
- Laboratory of Metabolic Disorders, Faculty of Applied Sciences, UNICAMP, Limeira, 13484-350, Brazil
| | - C Magnan
- Université de Paris, BFA, UMR 8251, CNRS, F-75013, Paris, France
| | - H Le Stunff
- Université de Paris, BFA, UMR 8251, CNRS, F-75013, Paris, France
| | - A S Torsoni
- Laboratory of Metabolic Disorders, Faculty of Applied Sciences, UNICAMP, Limeira, 13484-350, Brazil
| | - M Milanski
- Laboratory of Metabolic Disorders, Faculty of Applied Sciences, UNICAMP, Limeira, 13484-350, Brazil.
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Reginato A, de Fante T, Portovedo M, da Costa NF, Payolla TB, Miyamotto JÉ, Simino LA, Ignácio-Souza LM, Torsoni MA, Torsoni AS, Milanski M. Autophagy proteins are modulated in the liver and hypothalamus of the offspring of mice with diet-induced obesity. J Nutr Biochem 2016; 34:30-41. [DOI: 10.1016/j.jnutbio.2016.04.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2015] [Revised: 04/06/2016] [Accepted: 04/07/2016] [Indexed: 01/05/2023]
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Nascimento LFR, Souza GFP, Morari J, Barbosa GO, Solon C, Moura RF, Victório SC, Ignácio-Souza LM, Razolli DS, Carvalho HF, Velloso LA. n-3 Fatty Acids Induce Neurogenesis of Predominantly POMC-Expressing Cells in the Hypothalamus. Diabetes 2016; 65:673-86. [PMID: 26512023 DOI: 10.2337/db15-0008] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/05/2015] [Accepted: 10/17/2015] [Indexed: 11/13/2022]
Abstract
Apoptosis of hypothalamic neurons is believed to play an important role in the development and perpetuation of obesity. Similar to the hippocampus, the hypothalamus presents constitutive and stimulated neurogenesis, suggesting that obesity-associated hypothalamic dysfunction can be repaired. Here, we explored the hypothesis that n-3 polyunsaturated fatty acids (PUFAs) induce hypothalamic neurogenesis. Both in the diet and injected directly into the hypothalamus, PUFAs were capable of increasing hypothalamic neurogenesis to levels similar or superior to the effect of brain-derived neurotrophic factor (BDNF). Most of the neurogenic activity induced by PUFAs resulted in increased numbers of proopiomelanocortin but not NPY neurons and was accompanied by increased expression of BDNF and G-protein-coupled receptor 40 (GPR40). The inhibition of GPR40 was capable of reducing the neurogenic effect of a PUFA, while the inhibition of BDNF resulted in the reduction of global hypothalamic cell. Thus, PUFAs emerge as a potential dietary approach to correct obesity-associated hypothalamic neuronal loss.
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Affiliation(s)
| | | | - Joseane Morari
- Laboratory of Cell Signaling, University of Campinas, Campinas, Brazil
| | | | - Carina Solon
- Laboratory of Cell Signaling, University of Campinas, Campinas, Brazil
| | - Rodrigo F Moura
- Laboratory of Cell Signaling, University of Campinas, Campinas, Brazil
| | - Sheila C Victório
- Laboratory of Cell Signaling, University of Campinas, Campinas, Brazil
| | | | - Daniela S Razolli
- Laboratory of Cell Signaling, University of Campinas, Campinas, Brazil
| | | | - Lício A Velloso
- Laboratory of Cell Signaling, University of Campinas, Campinas, Brazil
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Souza DDFI, Ignácio-Souza LM, Reis SRDL, Reis MADB, Stoppiglia LF, Carneiro EM, Boschero AC, Arantes VC, Latorraca MQ. A low-protein diet during pregnancy alters glucose metabolism and insulin secretion. Cell Biochem Funct 2011; 30:114-21. [PMID: 22034157 DOI: 10.1002/cbf.1824] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2010] [Revised: 09/15/2011] [Accepted: 09/27/2011] [Indexed: 11/06/2022]
Abstract
In pancreatic islets, glucose metabolism is a key process for insulin secretion, and pregnancy requires an increase in insulin secretion to compensate for the typical insulin resistance at the end of this period. Because a low-protein diet decreases insulin secretion, this type of diet could impair glucose homeostasis, leading to gestational diabetes. In pancreatic islets, we investigated GLUT2, glucokinase and hexokinase expression patterns as well as glucose uptake, utilization and oxidation rates. Adult control non-pregnant (CNP) and control pregnant (CP) rats were fed a normal protein diet (17%), whereas low-protein non-pregnant (LPNP) and low-protein pregnant (LPP) rats were fed a low-protein diet (6%) from days 1 to 15 of pregnancy. The insulin secretion in 2.8 mmol l(-1) of glucose was higher in islets from LPP rats than that in islets from CP, CNP and LPNP rats. Maximal insulin release was obtained at 8.3 and 16.7 mmol l(-1) of glucose in LPP and CP groups, respectively. The glucose dose-response curve from LPNP group was shifted to the right in relation to the CNP group. In the CP group, the concentration-response curve to glucose was shifted to the left compared with the CNP group. The LPP groups exhibited an "inverted U-shape" dose-response curve. The alterations in the GLUT2, glucokinase and hexokinase expression patterns neither impaired glucose metabolism nor correlated with glucose islet sensitivity, suggesting that β-cell sensitivity to glucose requires secondary events other than the observed metabolic/molecular events.
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