IUGR disrupts the PPARγ-Setd8-H4K20me(1) and Wnt signaling pathways in the juvenile rat hippocampus. Int J Dev Neurosci 2014 Nov;38:59-67
Date
08/12/2014Pubmed ID
25107645Pubmed Central ID
PMC4268161DOI
10.1016/j.ijdevneu.2014.07.008Scopus ID
2-s2.0-84906701300 (requires institutional sign-in at Scopus site) 23 CitationsAbstract
Intrauterine growth restriction (IUGR) programs neurodevelopmental impairment and long-term neurological morbidities. Neurological morbidities in IUGR infants are correlated with changes hippocampal volume. We previously demonstrated that IUGR alters hippocampal cellular composition in both neonatal and juvenile rat pups in association with altered hippocampal gene expression and epigenetic determinants. PPARγ signaling is important for neurodevelopment as well as epigenetic integrity in the brain via the PPARγ-Setd8-H4K20me(1) axis and Wnt signaling. We hypothesized that IUGR would decrease expression of PPARγ, Setd8, and H4K20me(1) in juvenile rat hippocampus. We further hypothesized that reduced PPARγ-Setd8-H4K20me(1) would be associated with reduced Wnt signaling genes Wnt3a and β-catenin, and wnt target gene Axin2. To test our hypothesis we used a rat model of uteroplacental insufficiency-induced IUGR. We demonstrated that PPARγ localizes to oligodendrocytes, neurons and astrocytes within the juvenile rat hippocampus. We also demonstrated that IUGR reduces levels of PPARγ, Setd8 and H4K20me(1) in male and female juvenile rat hippocampus in conjunction with reduced Wnt signaling components in only male rats. We speculate that reduced PPARγ and Wnt signaling may contribute to altered hippocampal cellular composition which, in turn, may contribute to impaired neurodevelopment and subsequent neurocognitive impairment in IUGR offspring.
Author List
Ke X, Xing B, Yu B, Yu X, Majnik A, Cohen S, Lane R, Joss-Moore LAuthor
Susan Cohen MD Associate Professor in the Pediatrics department at Medical College of WisconsinMESH terms used to index this publication - Major topics in bold
ActinsAnimals
Animals, Newborn
Body Weight
Disease Models, Animal
Female
Fetal Growth Retardation
Gene Expression Regulation, Developmental
Hippocampus
Histone-Lysine N-Methyltransferase
Histones
Male
PPAR gamma
Phosphopyruvate Hydratase
RNA, Messenger
Rats
Sex Factors
Wnt Signaling Pathway
