Maternal diet-induced microRNAs and mTOR underlie ß cell dysfunction in offspring.
J Clin Invest
; 124(10): 4395-410, 2014 Oct.
Article
em En
| MEDLINE
| ID: mdl-25180600
ABSTRACT
A maternal diet that is low in protein increases the susceptibility of offspring to type 2 diabetes by inducing long-term alterations in ß cell mass and function. Nutrients and growth factor signaling converge through mTOR, suggesting that this pathway participates in ß cell programming during fetal development. Here, we revealed that newborns of dams exposed to low-protein diet (LP0.5) throughout pregnancy exhibited decreased insulin levels, a lower ß cell fraction, and reduced mTOR signaling. Adult offspring of LP0.5-exposed mothers exhibited glucose intolerance as a result of an insulin secretory defect and not ß cell mass reduction. The ß cell insulin secretory defect was distal to glucose-dependent Ca2+ influx and resulted from reduced proinsulin biosynthesis and insulin content. Islets from offspring of LP0.5-fed dams exhibited reduced mTOR and increased expression of a subset of microRNAs, and blockade of microRNA-199a-3p and -342 in these islets restored mTOR and insulin secretion to normal. Finally, transient ß cell activation of mTORC1 signaling in offspring during the last week of pregnancy of mothers fed a LP0.5 rescued the defect in the neonatal ß cell fraction and metabolic abnormalities in the adult. Together, these findings indicate that a maternal low-protein diet alters microRNA and mTOR expression in the offspring, influencing insulin secretion and glucose homeostasis.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Dieta com Restrição de Proteínas
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MicroRNAs
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Fenômenos Fisiológicos da Nutrição Materna
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Células Secretoras de Insulina
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Serina-Treonina Quinases TOR
Limite:
Animals
/
Pregnancy
Idioma:
En
Revista:
J Clin Invest
Ano de publicação:
2014
Tipo de documento:
Article