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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Spontaneous physical activity and mediators of energy homeostasis in the hypothalamus of mice from 4 to 10 months of age

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Benfato, Izabelle Dias [1] ; Moretto, Thais Ludmilla [1] ; de Carvalho, Francine Pereira [1] ; Barthichoto, Marcela [1] ; Ferreira, Sandra Mara [2] ; Costa Junior, Jose Maria [2] ; Lazzarin, Mariana Cruz [1] ; de Oliveira, Flavia [1] ; Martinez, Carolina [1] ; de Franca Carvalho, Carolina Prado [1] ; Machado de Oliveira, Camila Aparecida [1]
Total Authors: 11
[1] Univ Fed Sao Paulo, Inst Hlth & Soc, Dept Biosci, Santos, SP - Brazil
[2] State Univ Campinas UNICAMP, Inst Biol, Dept Struct & Funct Biol, Campinas, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Experimental Physiology; v. 102, n. 11, p. 1524-1534, NOV 1 2017.
Web of Science Citations: 0

New Findings What is the central question of this study? Is the initial decline of spontaneous physical activity (SPA) in mice related to impaired insulin and leptin signalling or brain-derived neurotrophic factor expression in the hypothalamus? What is the main finding and its importance? We showed that SPA started to decline at an early stage, concomitantly with an impairment of hypothalamic leptin signalling. Consequently, energy expenditure decreased and glucose tolerance worsened. Our results demonstrate the need to counteract the initial decline in SPA to avoid metabolic impairments and indicate the possible involvement of central leptin in the reduction in SPA with age. The biological control of physical activity is poorly understood. Age decreases insulin, leptin and brain-derived neurotrophic factor (BDNF) signalling in the hypothalamus, and all have been shown to modulate spontaneous physical activity (SPA). We investigated the age at which SPA starts to decline and whether this is associated with the emergence of hypothalamic insulin and leptin resistance and reduced BDNF expression. Spontaneous physical activity (and other parameters of locomotion) and energy expenditure were determined monthly in mice from the 4th to the 10thmonth of age. Metabolic and hypothalamic analyses were performed in 4-, 6- and 10-month-old mice. Spontaneous physical activity, distance travelled and speed of locomotion started to decrease in 6-month-old mice. The reduction in SPA became more evident from 8months of age. Energy expenditure decreased from the 8thmonth. Hypothalamic BDNF protein expression and insulin signalling did not change throughout the time span studied. Leptin signalling decreased at 6 and 10months compared with 4months. Also, compared with 4months, 6- and 10-month-old mice were glucose intolerant. In conclusion, SPA begins to decline in parallel with reduced hypothalamic leptin signalling. Metabolic impairment also manifests as SPA decreases, highlighting the need to understand the regulation of SPA in order to combat its decline. (AU)

FAPESP's process: 11/05932-3 - Molecular mechanisms involved in the modulation of spontaneous physical activity and development of obesity
Grantee:Camila Aparecida Machado de Oliveira
Support type: Research Grants - Young Investigators Grants
FAPESP's process: 13/01624-8 - Effects of different diets (low protein and high fat diet) on spontaneous physical activity and hypothalamic expression of genes related to energy homeostasis in mice
Grantee:Thais Ludmilla Moretto
Support type: Scholarships in Brazil - Master