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Changes in renal renin gene expression in fetal sheep
D Y Zhang1, E R Lumbers, G Simonetta
1School of Physiology and Pharmacology, University of New South Wales, Sydney, Australia.
Clinical and Experimental Pharmacology & Physiology
|August 1, 1996
Summary
Fetal sheep kidneys show significantly higher renin gene expression than adult kidneys. This elevated expression in fetuses is linked to increased renin levels in fetal circulation.
Area of Science:
- Renal physiology
- Developmental biology
- Molecular endocrinology
Background:
- The renin-angiotensin-aldosterone system (RAAS) plays a crucial role in blood pressure regulation.
- Renin, the rate-limiting enzyme in RAAS, is primarily produced in the kidneys.
- Understanding renin gene expression during development is vital for comprehending fetal cardiovascular homeostasis.
Purpose of the Study:
- To investigate and quantify renin gene expression in ovine fetal kidneys.
- To compare renin gene expression levels between fetal and adult sheep.
- To determine developmental changes in renin gene expression during ovine gestation.
Main Methods:
- Kidney tissue samples were collected from 13 fetal sheep (aged 91-142 days) and 4 adult sheep.
- Renal renin mRNA levels were measured as an indicator of renin gene expression.
- Statistical analysis was performed to compare expression levels across different age groups.
Main Results:
- Renal renin mRNA levels were significantly higher in fetal sheep compared to adult sheep (P < 0.001).
- No significant differences in renin mRNA levels were observed between fetal sheep at 91 and 134 days of gestation.
- A notable increase in renin gene expression was observed in late-term fetal sheep (142 days) compared to earlier fetal stages.
Conclusions:
- The fetal kidney exhibits a high level of renin gene expression.
- This elevated fetal renin gene expression is responsible for the high concentrations of renin found in the fetal circulation.
- These findings highlight the importance of renin during ovine fetal development and its potential role in maintaining fetal cardiovascular function.