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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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