Maternal Roux-en-Y gastric bypass impairs insulin action and endocrine pancreatic function in male F1 offspring
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Obesity is predominant in women of reproductive age. Roux-en-Y gastric bypass (RYGB) is the most common bariatric procedure that is performed in obese women for weight loss and metabolic improvement. However, some studies suggest that this procedure negatively affects offspring. Herein, using Western diet (WD)-obese female rats, we investigated the effects of maternal RYGB on postnatal body development, glucose tolerance, insulin secretion and action in their adult male F1 offspring.
Female Wistar rats consumed a Western diet (WD) for 18 weeks, before being submitted to RYGB (WD-RYGB) or SHAM (WD-SHAM) operations. After 5 weeks, WD-RYGB and WD-SHAM females were mated with control male breeders, and the F1 offspring were identified as: WD-RYGB-F1 and WD-SHAM-F1.
The male F1 offspring of WD-RYGB dams exhibited decreased BW, but enhanced total nasoanal length gain. At 120 days of age, WD-RYGB-F1 rats displayed normal fasting glycemia and glucose tolerance but demonstrated reduced insulinemia and higher glucose disappearance after insulin stimulus. In addition, these rodents presented insulin resistance in the gastrocnemius muscle and retroperitoneal fat, as judged by lower Akt phosphorylation after insulin administration, but an increase in this protein in the liver. Finally, the islets from WD-RYGB-F1 rats secreted less insulin in response to glucose and displayed increased β-cell area and mass.
RYGB in WD dams negatively affected their F1 offspring, leading to catch-up growth, insulin resistance in skeletal muscle and white fat, and β-cell dysfunction. Therefore, our data are the first to demonstrate that the RYGB in female rats may aggravate the metabolic imprinting induced by maternal WD consumption, in their male F1 descendants. However, since we only used male F1 rats, further studies are necessary to demonstrate if such effect may also occur in female F1 offspring from dams that underwent RYGB operation.
KeywordsBariatric operation Insulin resistance Insulin secretion Maternal programming Metabolic imprinting Obesity
We are grateful to Assis Roberto Escher for animal care and the graduate student Gabriela Alves Bronczek for all their help with experiments.
This study forms part of the MSc thesis of C. B. Pietrobon and was supported by Grants from Fundação Araucária (155/2013), Conselho Nacional para o Desenvolvimento Científico e Tecnológico (CNPq, Processo no. 447190/2014-8), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES, PROAP, no.: 817693/2015) and Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP, 2015/12611-0).
Compliance with ethical standards
Conflict of interest
All authors who contributed to the study state that there was no conflict of interest.
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