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Renal morphology and glomerular capillarisation in young adult sheep born moderately preterm

Published online by Cambridge University Press:  10 December 2020

Megan R. Sutherland Open the ORCID record for Megan R. Sutherland [Opens in a new window] ,
Waleed Malik ,
Vivian B. Nguyen ,
Vivian Tran ,
Graeme R. Polglase  and
Mary Jane Black
Megan R. Sutherland*
Affiliation:
Department of Anatomy and Developmental Biology and the Monash Biomedicine Discovery Institute, Monash University, Clayton, Victoria, Australia
Waleed Malik
Affiliation:
Department of Anatomy and Developmental Biology and the Monash Biomedicine Discovery Institute, Monash University, Clayton, Victoria, Australia
Vivian B. Nguyen
Affiliation:
Department of Anatomy and Developmental Biology and the Monash Biomedicine Discovery Institute, Monash University, Clayton, Victoria, Australia
Vivian Tran
Affiliation:
Department of Anatomy and Developmental Biology and the Monash Biomedicine Discovery Institute, Monash University, Clayton, Victoria, Australia
Graeme R. Polglase
Affiliation:
The Ritchie Centre, Department of Obstetrics and Gynaecology, Monash University and the Hudson Institute of Medical Research, Clayton, Victoria, Australia
Mary Jane Black
Affiliation:
Department of Anatomy and Developmental Biology and the Monash Biomedicine Discovery Institute, Monash University, Clayton, Victoria, Australia
*
Address for correspondence: Megan Sutherland, Department of Anatomy & Developmental Biology, 19 Innovation Walk, Building 76, Monash University, Clayton, Victoria, 3800, Australia. Email: [email protected]
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Abstract

Preterm birth (delivery <37 weeks of gestation) is associated with impaired glomerular capillary growth in neonates; if this persists, it may be a contributing factor in the increased risk of hypertension and chronic kidney disease in people born preterm. Therefore, in this study, we aimed to determine the long-term impact of preterm birth on renal morphology, in adult sheep. Singleton male sheep were delivered moderately preterm at 132 days (~0.9) of gestation (n = 6) or at term (147 days gestation; n = 6) and euthanised at 14.5 months of age (early adulthood). Stereological methods were used to determine mean renal corpuscle and glomerular volumes, and glomerular capillary length and surface area, in the outer, mid and inner regions of the renal cortex. Glomerulosclerosis and interstitial collagen levels were assessed histologically. By 14.5 months of age, there was no difference between the term and preterm sheep in body or kidney weight. Renal corpuscle volume was significantly larger in the preterm sheep than the term sheep, with the preterm sheep exhibiting enlarged Bowman’s spaces; however, there was no difference in glomerular volume between groups, with no impact of preterm birth on capillary length or surface area per glomerulus. There was also no difference in interstitial collagen levels or glomerulosclerosis index between groups. Findings suggest that moderate preterm birth does not adversely affect glomerular structure in early adulthood. The enlarged Bowman’s space in the renal corpuscles of the preterm sheep kidneys, however, is of concern and merits further research into its cause and functional consequences.

Keywords

Preterm birthkidney developmentkidney diseaseglomerulusBowman’s space
Type
Original Article
Information
Journal of Developmental Origins of Health and Disease , Volume 12 , Issue 6 , December 2021 , pp. 975 - 981
Copyright
© The Author(s), 2020. Published by Cambridge University Press in association with International Society for Developmental Origins of Health and Disease

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