Abstract
The impact of diet-induced maternal obesity on offspring airway hyperresponsiveness was studied in a diversity outbred mouse model that mirrors human genetic diversity. Female mice were started on high-fat or regular diet 8 weeks before breeding and throughout pregnancy and lactation. After weaning, all offspring were fed a regular diet. By 12 weeks, body weight and fat were increased in offspring of high-fat diet–fed dams, which was accompanied by metabolic dysfunction and hyperinsulinemia. This was followed by increased epithelial sensory innervation and increased bronchoconstriction to inhaled 5-hydroxytryptamine at 16 weeks. Bronchoconstriction was nerve mediated and blocked by vagotomy or atropine. A high-fat diet before pregnancy exerted the most influence on offspring airway physiology. Maternal obesity induced metabolic dysfunction and hyperinsulinemia, resulting in hyperinnervation and subsequent increased reflex-mediated hyperresponsiveness in their offspring. This is relevant to our understanding of asthma inheritance, considering the genetic diversity of humans.
Authors
Kayla R. Williams, Hoyt A.T.K. Bright, Allison D. Fryer, David B. Jacoby, Zhenying Nie
Figure 8
Offspring of dams on an HFD (filled triangles) have similar neuronal M2 muscarinic receptor protein expression at 16 weeks old when compared to offspring of dams on an RD (unfilled upside-down triangles).
