Cited by 184Pregnancy and preeclampsia studiesBirth, Development, and HealthCongenital heart defects research

Restriction of placental function alters heart development in the sheep fetus

Morrison, J. L., Botting, K. J., Dyer, J. L., Williams, S. J., Thornburg, K. L., McMillen, I. C.·2007·American Journal of Physiology-Regulatory, Integrative and Comparative Physiology

Abstract

Placental insufficiency, resulting in restriction of fetal substrate supply, is a major cause of intrauterine growth restriction (IUGR) and increased neonatal morbidity. Fetal adaptations to placental restriction maintain the growth of key organs, including the heart, but the impact of these adaptations on individual cardiomyocytes is unknown. Placental and hence fetal growth restriction was induced in fetal sheep by removing the majority of caruncles in the ewe before mating (placental restriction, PR). Vascular surgery was performed on 13 control and 11 PR fetuses at 110–125 days of gestation (term: 150 ± 3 days). PR fetuses with a mean gestational Po 2 < 17 mmHg were defined as hypoxic. At postmortem (<135 or >135 days), fetal hearts were collected, and cardiomyocytes were isolated and fixed. Proliferating cardiomyocytes were counted by immunohistochemistry of Ki67 protein. Cardiomyocytes were stained with methylene blue to visualize the nuclei, and the proportion of mononucleated cells and length and width of cardiomyocytes were measured. PR resulted in chronic fetal hypoxia, IUGR, and elevated plasma cortisol concentrations. Although there was no difference in relative heart weights between control and PR fetuses, there was an increase in the proportion of mononucleated cardiomyocytes in PR fetuses. Whereas mononucleated and binucleated cardiomyocytes were smaller, the relative size of cardiomyocytes when expressed relative to heart weight was larger in PR compared with control fetuses. The increase in the relative proportion of mononucleated cardiomyocytes and the relative sparing of the growth of individual cardiomyocytes in the growth-restricted fetus are adaptations that may have long-term consequences for heart development in postnatal life.

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Crossref · 10.1152/ajpregu.00798.2006

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  • A growth-restricted fetus has smaller coronary arteries, fewer but more immature cardiomyocytes, less elastin in the arteries, and fewer nephrons in the kidney.

    “For example, a growth-restricted fetus has smaller coronary arteries (288), fewer but more immature cardiomyocytes (55,348,394), less elastin in the arteries (152, 362, 526), and fewer nephrons in the kidney (22,352).”

    From Placental Origins of Chronic Disease (2016) · cites this paper as [394]

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Authors
Morrison, J. L., Botting, K. J., Dyer, J. L., Williams, S. J., Thornburg, K. L., & McMillen, I. C.
Affiliations
  • The University of Adelaide (AU)
  • University of South Australia (AU)
Venue
American Journal of Physiology-Regulatory, Integrative and Comparative Physiology
Published
2007-07
Volume
293
Issue
1
Pages
R306-R313
ISSN
  • 0363-6119 (ISSN-L)
  • 1522-1490
OpenAlex
W2103433863
Cited by
184
References
56
Citations by year
2026: 3 · 2025: 10 · 2024: 9 · 2023: 6 · 2022: 11 · 2021: 9 · 2020: 10 · 2019: 7 · 2018: 17 · 2017: 13 · 2016: 8 · 2015: 11 · 2014: 9 · 2013: 13 · 2012: 11
FWCI
10.92
Type
journal article
Language
en
Open access
closed
Locations
  • American Journal of Physiology-Regulatory, Integrative and Comparative Physiology (publishedVersion)
  • PubMed (publishedVersion)
  • Adelaide Research & Scholarship (AR&S) (University of Adelaide) (submittedVersion)
Topics
  • Health Sciences › Medicine › Obstetrics and Gynecology › Pregnancy and preeclampsia studies
  • Health Sciences › Medicine › Pediatrics, Perinatology and Child Health › Birth, Development, and Health
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Congenital heart defects research
Keywords
fetal hypoxia, fetal growth restriction, heart development, cardiomyocyte proliferation, cardiomyocyte size, fetal sheep, cortisol
MeSH terms
Animals, Blood Gas Analysis, Female, Fetal Hypoxia, Fetal Growth Retardation, Fetus, Heart, Hydrocortisone, Hyperplasia, Male, Myocardium, Oxygen Consumption, Placenta, Pregnancy, Sex Characteristics, Sheep, Myocytes, Cardiac, Cell Size, Cell Proliferation

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