Abstract
Purpose
Early weaning (EW) is a risk factor for obesity development. Brown adipose tissue (BAT) hypofunction is related to obesity onset. Here, we evaluated whether sympathetic nervous system (SNS) activity in BAT and the thermogenic function of BAT are decreased in adulthood in obese rats from two EW models.
Methods
At the time of birth, lactating Wistar rats and their pups (three males and three females) were separated into three groups: the control group, in which pups consumed milk throughout lactation; the non-pharmacological EW (NPEW) group, in which suckling was interrupted with a bandage during the last 3 days of lactation; and the pharmacological EW (PEW) group, in which dams were treated with bromocriptine (0.5 mg/twice a day) 3 days before weaning. The offspring were sacrificed on PN180.
Results
Adult male rats from both EW models exhibited lower BAT SNS activity. Female rats from the PEW group showed a decrease in BAT SNS activity. The protein levels of UCP1 were lower in the NPEW males, while PGC1α levels were lower in both PEW and NPEW males. Both groups of EW females showed reductions in the levels of β3-AR, TRβ1, and PGC1α. The UCP1 protein level was reduced only in the NPEW females. The EW groups of both sexes had lower AMPK protein levels in BAT. In the hypothalamus, only the PEW females showed an increase in AMPK protein levels. In both groups of EW males, adrenal catecholamine was increased and tyrosine hydroxylase was decreased, while in EW females, adrenal catecholamine was decreased.
Conclusions
Early weaning alters the thermogenic capacity of BAT, which partially contributes to obesity in adulthood, and there are sex-related differences in these alterations.
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Acknowledgements
All authors are grateful to Mrs. Fabiana Gallaulckydio and Mr Ulisses Risso Siqueira for animal care and technical assistance.
Funding
This research was supported by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) (Grant No. 001), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ).
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Concept and design: TCP; EGM; PCL. Animal treatment, collection of samples, and measurements: TCP; CBP; IMB; FAHC; CC, TRS. Analysis and interpretation of data: all authors. Drafting and/or revising the article critically for important intellectual content: TCP; EO; EGM; PCL.
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All applicable international, national, and/or institutional guidelines for the care and use of animals were followed.
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Peixoto, T.C., Pietrobon, C.B., Bertasso, I.M. et al. Early weaning alters the thermogenic capacity of brown adipose tissue in adult male and female rats. Eur J Nutr 59, 2207–2218 (2020). https://doi.org/10.1007/s00394-019-02071-9
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DOI: https://doi.org/10.1007/s00394-019-02071-9