The impact of maternal obesity on polycystic kidney disease progression in a mouse model.

Due to the growing obesity epidemic in the United States, it is now estimated that approximately one third of all children are born to obese moms. These data, coupled with data indicating that obesity is associated with accelerated cyst growth in patients with autosomal dominant polycystic kidney disease (ADPKD), led us to hypothesize that maternal obesity may influence the rate of disease progression in offspring. To test this hypothesis, we induced maternal obesity by high-fat diet (HFD) feeding in the orthologous Pkd1(RC/RC) mouse model of ADPKD and followed polycystic kidney disease (PKD) progression in offspring for up to 1 year. Surprisingly, and in contrast to our initial hypothesis, exposure to maternal obesity during pregnancy and lactation did not significantly impact PKD severity in offspring at 3 mo or 1 yr of age. In contrast, reexposure to HFD for ∼3 m beginning at 12 wk of age worsened PKD severity in female, but not male, offspring born to obese dams as measured by cystic index, cyst number, and cyst area. Despite worsened cystic parameters, fibrosis and blood urea nitrogen were not altered in these animals. Collectively, these findings indicate that maternal obesity may accelerate PKD severity in female offspring exposed to an obesogenic diet.NEW & NOTEWORTHY Due to the growing obesity pandemic, almost one third of all children are born to mothers with obesity; however, the impact of maternal obesity on polycystic kidney disease (PKD) is unknown. In this manuscript, we found that maternal obesity did not worsen PKD severity in Pkd1(RC/RC) mice at 3 mo or 1 yr of age when weaned onto normal chow diet. However, rechallenging pups born to obese mothers worsened PKD severity in female but not male mice.