The role of fatty acids on hypothalamic autophagy regulation
| Full text | |
| Author(s): |
Mendes, Natalia F.
[1, 2]
;
Gaspar, Joana M.
[3, 2, 4]
;
Lima-Junior, Jose C.
[3, 2]
;
Donato, Jr., Jose
[5]
;
Velloso, Licio A.
[3, 2]
;
Araujo, Eliana P.
[1, 2]
Total Authors: 6
|
| Affiliation: | [1] Univ Estadual Campinas, UNICAMP, Sch Nursing, Rua Tessalia Vieira Camargo 126, BR-13083887 Campinas, SP - Brazil
[2] Univ Estadual Campinas, UNICAMP, Obes & Comorbid Res Ctr, Lab Cell Signaling, Campinas, SP - Brazil
[3] Univ Estadual Campinas, UNICAMP, Fac Med Sci, Campinas, SP - Brazil
[4] Fed Univ Santa Catarina UFSC, Dept Biochem, Postgrad Program Biochem, Florianopolis, SC - Brazil
[5] Univ Sao Paulo, Inst Biomed Sci, Dept Physiol & Biophys, BR-05508000 Sao Paulo, SP - Brazil
Total Affiliations: 5
|
| Document type: | Journal article |
| Source: | METABOLISM-CLINICAL AND EXPERIMENTAL; v. 85, p. 171-182, AUG 2018. |
| Web of Science Citations: | 6 |
| Abstract | |
Background: The consumption of large amounts of dietary fats induces hypothalamic inflammation and impairs the function of the melanocortin system, leading to a defective regulation of caloric intake and whole-body energy expenditure. In mice fed a high-fat diet (HFD), TCF-beta 1 expression was increased and NF-kappa B signaling was activated in proopiomelanocortin neurons, which plays an important role in the obesity-associated hypothalamic inflammation scenario. However, whether excessive hypothalamic TGF-beta 1 impairs energy homeostasis remains unclear. Objectives: We aimed to investigate the role of diet-induced hypothalamic TGF-beta 1 on inflammation and whole-body energy homeostasis. Methods: A TGF-beta 1 inhibitory lentiviral shRNA particle was stereotaxically injected bilaterally in the arcuate nucleus (ARC) of C57BL/6 mice fed a HFD. We assessed changes in body mass and adiposity, food intake, inflammatory markers, and the function of energy and glucose metabolism. Results: TGF-beta 1 down-regulation in the ARC-attenuated body-mass gain, reduced fat-mass accumulation, decreased hypothalamic inflammatory markers, and protected against HFD-induced lipohypertrophy of brown adipose tissue. In addition, the inhibition of hypothalamic TGF-beta 1 increased the locomotor activity and improved whole-body lipid metabolism, which attenuated hepatic fat accumulation and serum triglyceride levels. No changes were observed in food intake and glucose homeostasis. Conclusion: Hypothalamic TGF-beta 1 down-regulation attenuates hypothalamic inflammation and improves energy metabolism, resulting in lower body-mass gain and lower fat-mass accumulation, which protects mice from the development of obesity. Our data suggest that modulation of hypothalamic TGF-beta 1 expression might be an effective strategy to treat obesity. (C) 2018 Elsevier Inc. All rights reserved. (AU) | |
| FAPESP's process: | 13/07607-8 - OCRC - Obesity and Comorbidities Research Center |
| Grantee: | Licio Augusto Velloso |
| Support type: | Research Grants - Research, Innovation and Dissemination Centers - RIDC |
| FAPESP's process: | 16/17810-3 - Evaluation of TGF-b1 function in the hypothalamus of animals with obesity and diabetes induced by high-fat diet |
| Grantee: | Natália Ferreira Mendes |
| Support type: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 17/02983-2 - The role of growth hormone in the brain: relevance for neural functions and in disease |
| Grantee: | Jose Donato Junior |
| Support type: | Research Projects - Thematic Grants |
| FAPESP's process: | 15/10078-2 - Effect of a high caloric diet in the expression of Hypoxia- inducible factor-1 (HIF1): role in obesity through deregulation of POMC gene |
| Grantee: | Joana Margarida Navalho Gaspar |
| Support type: | Scholarships in Brazil - Post-Doctorate |