Abstract
Fetal growth restriction (FGR) is associated with developmental programming of adult onset hypertension, which may be related to differences in nephron development. Prior studies showed that maternal nutrient restriction is associated with reduced nephrogenesis in rodents, especially in male progeny. We hypothesized that maternal genetic risk for FGR may similarly affect fetal kidney development, leading to adult onset hypertension. We employed an angiotensinogen (AGT) gene titration transgenic (TG) construct with 3 copies of the mouse AGT gene that mimics a common human genotype (AGT A[-6]G) associated with FGR. We investigated whether FGR in 2-copy (wild type, [WT]) progeny from 3-copy TG dams leads to developmental programming differences in kidney development and adult blood pressure compared with age- and sex-matched controls. Progeny were tested in the late fetal period (e17.5), neonatal period (2 weeks of age), and as young adults (12 weeks). We measured weights, tested for renal oxidative stress, compared renal DNA methylation profiles, counted the number of glomeruli, and measured adult blood pressure ± stress. Progeny from TG dams were growth restricted with evidence of renal oxidative stress, males showed fetal renal DNA hypermethylation, they had fewer glomeruli, and they developed stress-induced hypertension as adults. Their female siblings did not share this pathology and instead resembled progeny from WT dams. Surprisingly, glomerular counts in the neonatal period were not different between sexes or maternal genotypes. In turn, we suspect that differences in fetal renal DNA methylation may affect the long-term viability of glomeruli, rather than reducing nephrogenesis.
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Abbreviations
- AGT:
-
Angiotensinogen
- MAP:
-
Mean arterial pressure
- RAS:
-
Renin-angiotensin system
- TG:
-
Transgenic (3 copies of the murine AGT)
- WT:
-
Wild type (2 copies of the murine AGT gene)
- pTG:
-
2-Copy (WT) progeny from 3-copy (TG) dams
- pWT:
-
2-Copy (WT) progeny from WT dams
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Acknowledgments
We thank John Yucel from Data Sciences International for his assistance with blood pressure and locomotor activity methods. We are also indebted to Drs. Douglas Weeks, Lori Woods, and Kent Thornburg for their years of mentorship and support.
Funding
This study was funded by the National Institute of Child Health and Human Development (1R21HD068896-01A1), the Office of Women’s Health Research: Oregon K12 BIRCWH (HD043488-08), Society of Reproductive Investigation, and the Oregon Medical Research Foundation. Centre for Stochastic Geometry and Advanced Bioimaging was supported by Villum Foundation.
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Elizabeth DuPriest and Jessica Hebert are co-first authors.
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DuPriest, E., Hebert, J., Morita, M. et al. Fetal Renal DNA Methylation and Developmental Programming of Stress-Induced Hypertension in Growth-Restricted Male Mice. Reprod. Sci. 27, 1110–1120 (2020). https://doi.org/10.1007/s43032-019-00121-5
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DOI: https://doi.org/10.1007/s43032-019-00121-5