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Ovine uterine space restriction causes dysregulation of the renin-angiotensin system in fetal kidneys. Biol Reprod 2017 01 01;96(1):211-220

Date

04/11/2017

Pubmed ID

28395333

Pubmed Central ID

PMC6373835

DOI

10.1095/biolreprod.116.140079

Scopus ID

2-s2.0-85022323462   1 Citation

Abstract

: In ovine pregnancy, uterine space restriction (USR) resulting from decreased space for placental attachment caused intrauterine growth restriction and impaired nephrogenesis. The fetal kidney renin-angiotensin system (RAS) is involved in nephrogenesis, fluid balance, and iron deposition. Angiotensin II exerts its effects via multiple receptors: angiotensin II 1-8 receptor type 1 (AT 1 R) and type 2 (AT 2 R), and angiotensin II 1-7 Mas receptor (MASR).

Objective: : To test the hypothesis that ovine USR is associated with dysregulation of the fetal renal RAS.

Methods: : Multiparous pregnant ewes (n = 32), 16 with surgical bifurcated disconnection of one uterine horn to further reduce placental attachment sites, were studied. USR (n = 31) ovine fetuses were compared to nonspace restricted (NSR) singleton controls (n = 22) on gestational day (GD) 120 or GD130, term GD147. Fetal plasma was collected to evaluate plasma renin activity and iron indices. Fetal kidney AT 1 R, AT 2 R, and MASR proteins were assessed by Western immunoblotting and immunohistochemistry.

Results: : AT 1 R, AT 2 R, and MASR protein expression was higher in USR at GD130 than aged-matched NSR and USR at GD120, ( P < 0.05 all). AT 1 R and AT 2 R localization was homogenous throughout proximal and distal tubules in both USR and NSR at both gestational dates. MASR localization was punctate throughout renal cortical structures including tubules and glomeruli in both USR and NSR, shifted to intranuclear at GD130. Plasma renin activity was inversely related to plasma osmolarity ( P < 0.02) and was downregulated in USR at GD130 ( P < 0.05).

Conclusions: : By late gestation, USR upregulated renal angiotensin receptor expression, an effect with potential functional implications.

Author List

Kranch-Shorthouse RA, Bauer AS, Magness RR, Lopez GE, Segar JL, Blohowiak SE, Kling PJ

Author

Jeffrey L. Segar MD Professor in the Pediatrics department at Medical College of Wisconsin




MESH terms used to index this publication - Major topics in bold

Animals
Creatinine
Disease Models, Animal
Female
Fetal Growth Retardation
Iron
Kidney Cortex
Osmolar Concentration
Pregnancy
Receptors, Angiotensin
Renin
Renin-Angiotensin System
Sheep
jenkins-FCD Prod-486 e3098984f26de787f5ecab75090d0a28e7f4f7c0