Melatonin multiple effects on brown adipose tissue molecular machinery

Autor(es)

de Souza, Caroline A. P. ^[1] ; Gallo, Camila Congentino ^[1] ; de Camargo, Ludmilla Scodeler ^[1] ; Versignassi de Carvalho, Paula Vargas ^[1] ; Olescuck, Ingrid Fernandes ^[1] ; Macedo, Felipe ^[2] ; da Cunha, Fernanda Marques ^[2] ; Cipolla-Neto, Jose ^[3] ; do Amaral, Fernanda G. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Paulo, Dept Physiol, Pineal Neurobiol Lab, Sao Paulo - Brazil

^[2] Univ Fed Sao Paulo, Dept Biochem, Sao Paulo - Brazil

^[3] Univ Sao Paulo, Dept Physiol & Biophys, Neurobiol Lab, Sao Paulo - Brazil

• Tipo de documento: Artigo de Revisão
• Fonte: Journal of Pineal Research; v. 66, n. 2 MAR 2019.
• Citações Web of Science: 2

Resumo

Brown adipose tissue (BAT) influences energy balance through nonshivering thermogenesis, and its metabolism daily and seasonal variations are regulated by melatonin through partially known mechanisms. We evaluated the role of melatonin in BAT molecular machinery of male Control, pinealectomized (PINX), and melatonin-treated pinealectomized (PINX/Mel) adult rats. BAT was collected either every 3 hours over 24 hours or after cold or high-fat diet (HFD) acute exposure. HFD PINX animals presented decreased Dio2 expression, while HFD PINX/Mel animals showed increased Dio2, Ucp1, and Cidea expression. Cold-exposed PINX rats showed decreased Dio2 and Lhs expression, and melatonin treatment augmented Adr beta 3, Dio2, Ucp1, and Cidea expression. Daily profiles analyses showed altered Dio2, Lhs, Ucp1, Pgc1 alpha, and Cidea gene and UCP1 protein expression in PINX animals, leading to altered rhythmicity under sub-thermoneutral conditions, which was partially restored by melatonin treatment. The same was observed for mitochondrial complexes I, II, and IV protein expression and enzyme activity. Melatonin absence seems to impair BAT responses to metabolic challenges, and melatonin replacement reverses this effect, with additional increase in the expression of crucial genes, suggesting that melatonin plays an important role in several key points of the thermogenic activation pathway, influencing both the rhythmic profile of the tissue and its ability to respond to metabolic challenges, which is crucial for the organism homeostasis. (AU)

• Processo FAPESP: 14/50457-0 - Melatonina e a regulação do metabolismo energético: estudos básicos, clínicos e epidemiológicos
• Beneficiário: José Cipolla Neto
• Modalidade de apoio: Auxílio à Pesquisa - Temático