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Fetal hyperglycemia acutely induces persistent insulin resistance in skeletal muscle. J Endocrinol 2019 07 01;242(1):M1-M15

Date

11/18/2018

Pubmed ID

30444716

Pubmed Central ID

PMC6494731

DOI

10.1530/JOE-18-0455

Scopus ID

2-s2.0-85068887971   3 Citations

Abstract

Offspring exposed in utero to maternal diabetes exhibit long-lasting insulin resistance, though the initiating mechanisms have received minimal experimental attention. Herein, we show that rat fetuses develop insulin resistance after only 2-day continuous exposure to isolated hyperglycemia starting on gestational day 18. Hyperglycemia-induced reductions in insulin-induced AKT phosphorylation localized primarily to fetal skeletal muscle. The skeletal muscle of hyperglycemia-exposed fetuses also exhibited impaired in vivo glucose uptake. To address longer term impacts of this short hyperglycemic exposure, neonates were cross-fostered and examined at 21 days postnatal age. Offspring formerly exposed to 2 days late gestation hyperglycemia exhibited mild glucose intolerance with insulin signaling defects localized only to skeletal muscle. Fetal hyperglycemic exposure has downstream consequences which include hyperinsulinemia and relative uteroplacental insufficiency. To determine whether these accounted for induction of insulin resistance, we examined fetuses exposed to late gestational isolated hyperinsulinemia or uterine artery ligation. Importantly, 2 days of fetal hyperinsulinemia did not impair insulin signaling in murine fetal tissues and 21-day-old offspring exposed to fetal hyperinsulinemia had normal glucose tolerance. Similarly, fetal exposure to 2-day uteroplacental insufficiency did not perturb insulin-stimulated AKT phosphorylation in fetal rats. We conclude that fetal exposure to hyperglycemia acutely produces insulin resistance. As hyperinsulinemia and placental insufficiency have no such impact, this occurs likely via direct tissue effects of hyperglycemia. Furthermore, these findings show that skeletal muscle is uniquely susceptible to immediate and persistent insulin resistance induced by hyperglycemia.

Author List

Kua KL, Hu S, Wang C, Yao J, Dang D, Sawatzke AB, Segar JL, Wang K, Norris AW

Author

Jeffrey L. Segar MD Professor in the Pediatrics department at Medical College of Wisconsin




MESH terms used to index this publication - Major topics in bold

Animals
Blood Glucose
Female
Hyperglycemia
Hyperinsulinism
Insulin Resistance
Mice
Mice, Inbred C57BL
Muscle, Skeletal
Rats, Sprague-Dawley
jenkins-FCD Prod-478 d1509cf07a111124a2d122fd3df854cc0b993c00