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Does endothelin-1 mediate the hypoxemia-induced renal dysfunction in newborn rabbits?
D S Semama1, M Thonney, J P Guignard
1Service de Pédiatrie, Centre Hospitalier Universitaire Vaudois, Lausanne.
Biology of the Neonate
|January 1, 1995
Summary
Endothelin-1 does not cause kidney dysfunction during hypoxemia in newborn rabbits. Studies show hypoxemia increases renal vascular resistance, but endothelin-1 is not the mediator.
Area of Science:
- Neonatal physiology
- Renal function
- Cardiovascular research
Background:
- Acute normocapnic hypoxemia in newborn rabbits elevates renal vascular resistance, causing hypoperfusion and reduced glomerular filtration rate.
- Endothelin, a vasoconstrictor peptide from endothelial cells, is a potential mediator of hypoxemia-induced renal dysfunction.
Purpose of the Study:
- To investigate the role of endothelin-1 in mediating hypoxemia-induced renal dysfunction in newborn rabbits.
Main Methods:
- Experiments were conducted on 24 anesthetized, mechanically ventilated newborn rabbits, serving as their own controls.
- Renal blood flow and glomerular filtration rate were measured using p-aminohippuric acid and inulin clearance, respectively.
- Endothelin-1 was administered, and its effects were assessed with and without endothelin-1 antiserum.
Main Results:
- Endothelin-1 injection significantly increased blood pressure and renal vascular resistance, decreasing glomerular filtration rate and renal blood flow.
- Endothelin-1 antiserum demonstrated neutralizing activity in vivo.
- Despite endothelin-1 antiserum pretreatment, hypoxemia still increased renal vascular resistance and decreased renal blood flow and glomerular filtration rate.
Conclusions:
- Endothelin-1 does not appear to mediate the renal changes observed during acute normocapnic hypoxemia in newborn rabbits.