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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Chronic low-dose glucocorticoid treatment increases subcutaneous abdominal fat, but not visceral fat, of male Wistar rats

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Autor(es):
Nunes, Patricia Pereira [1] ; Andreotti, Sandra [1] ; Silva, Flaviane de Fatima [1] ; Laurato Sertie, Rogerio Antonio [1] ; Caminhotto, Rennan de Oliveira [1] ; Medeiros Komino, Ayumi Cristina [1] ; Reis, Gabriela Boltes [1] ; Lima, Fabio Bessa [1]
Número total de Autores: 8
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Biomed Sci, Sao Paulo - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: Life Sciences; v. 190, p. 29-35, DEC 1 2017.
Citações Web of Science: 4
Resumo

Aim: Most studies developed to investigate the effects of glucocorticoids chronic treatment on white adipose tissue uses high doses of these hormones. This study analyzes some effects of a chronic, continuous and steady infusion of low-dose hydrocortisone and the relationship with lipid accumulation in white adipose depots in rats. Main methods: Nineteen male Wistar rats were divided into control (CON) and cortisol (CORT) groups. Along six weeks CORT group received continuous infusion of 0.6 mg/kg/day of hydrocortisone, while CON group received saline. After euthanasia, subcutaneous and visceral (retroperitoneal and mesenteric) fat pads were excised, weighted and analyzed for: lipogenic enzymes activity; molecular changes of 11-hydroxysteroid dehydrogenase type 1 (11 beta HSD1) enzyme; enzymes involved in lipid uptake, incorporation, and metabolism and in fatty acids esterification. Besides, morphometric cell analysis was performed. Key findings: CORT group showed increased triglycerides, changes in lipoprotein profile and 26,8% increment in central subcutaneous (SC) mass, while visceral fat pads masses remained unchanged. Adipocytes from SC, only, presented increased fatty acid synthase, ATP-citrate lyase and glucose-6-phosphate dehydrogenase activity, in addition to reduced AMP-activated protein kinase and 11 beta HSD1 enzymes content. Significance: Chronic low-dose hydrocortisone treatment consequences seem to be different from those commonly seen in long term hypercortisolism. While high doses promote lipid accumulation in visceral depots, a low dose showed an increase in central SC depot only. This appears to involve an increment in lipid storage and in de novo lipogenesis enzymes activity. (AU)

Processo FAPESP: 13/24557-4 - Características da resposta lipogênica diferenciada nos tecidos adiposos de ratos submetidos a uma estimulação excessiva e prolongada com glicocorticóides
Beneficiário:Patricia Pereira Nunes Traldi
Linha de fomento: Bolsas no Brasil - Mestrado