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1 Department of Pediatrics, Division of Neonatology, University of Utah School of Medicine, Salt Lake City, UT, USA
2 Department of Pedatrics, David Geffen School of Medicine @ UCLA, Los Angeles, CA, USA
3 Department of Pediatrics, University of Arkansas Medical Sciences, Little Rock, AK, USA
4 Department of Nutrition, University of California @ Davis, Davis, CA, USA
* To whom correspondence should be addressed. E-mail: robert.lane{at}hsc.utah.edu.
Intrauterine growth retardation (IUGR) increases the risk of neuroendocrine reprogramming. In the rat, IUGR leads to persistent changes in cerebral mRNA levels. This suggests lasting alterations in IUGR cerebral transcriptional regulation, which may result from changes in chromatin structure. Candidate nutritional triggers for these changes include altered cerebral zinc and one-carbon metabolite levels. We hypothesized that IUGR affects cerebral chromatin structure in neonatal and postnatal rat brains. Rats were rendered IUGR by bilateral uterine artery ligation; controls (CON) underwent sham surgery. At day of life 0 (d0), we measured cerebral DNA methylation, histone acetylation, expression of chromatin affecting enzymes, and cerebral levels of one carbon metabolites and zinc. At day of life 21 (d21), we measured cerebral DNA methylation and histone acetylation, as well as the caloric content of CON and IUGR rat breast milk At d0, IUGR significantly decreased genomic wide and CpG island methylation, as well as increased histone 3 lysine 9 (H3/K9) and H3/K14 acetylation in the hippocampus and periventricular white matter respectively. IUGR also decreased expression of the chromatin effecting enzymes DNA methyltransferase 1 (DNMT1), methyl-CpG binding protein 2 (MeCP2), and histone deacetylase 1 (HDAC1) in association with increased cerebral levels of zinc. In d21 female IUGR rats, cerebral CpG DNA methylation remained lower, while H3/K9 and H3/K14 hyperacetylation persisted in hippocampus and white matter, respectively. In d21 male rats, IUGR decreased acetylation of H3/K9 and H3/K14 in these respective regions compared to controls. Despite these differences, caloric, fat, and protein content were similar in breast milk from CON and IUGR dams. We conclude that IUGR results in postnatal changes in cerebral chromatin structure, and that these changes are gender specific.
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