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Summary
Obstructive jaundice in rabbits impairs kidney blood vessel response to norepinephrine (NE). This effect is mediated by prostaglandins, suggesting a mechanism for kidney dysfunction in jaundiced patients.
Area of Science:
- Nephrology
- Vascular Physiology
- Gastroenterology
Background:
- Obstructive jaundice is linked to hypotension and acute renal failure.
- Renovascular responsiveness changes, particularly to norepinephrine (NE), may underlie these complications.
Purpose of the Study:
- To investigate alterations in vascular response to NE in obstructive jaundice.
- To determine the role of prostaglandins in these NE-mediated vascular changes.
Main Methods:
- Kidneys from bile duct-ligated (BDL) rabbits were perfused to measure responses to NE.
- Vascular force development in renal arteries (MRAs and ILAs) was assessed.
- Effects of jaundiced serum and indomethacin on NE response were evaluated.
Main Results:
- BDL rabbit kidneys showed a significantly blunted response to NE compared to controls.
- Renal arteries (MRAs and ILAs) from BDL rabbits exhibited depressed dose-response curves to NE.
- Incubation in jaundiced serum attenuated NE response in control renal arteries, an effect prevented by indomethacin.
Conclusions:
- Obstructive jaundice induces a decreased vascular contractile response to NE in rabbits.
- Prostaglandins mediate this attenuated response, highlighting their role in jaundice-associated renal dysfunction.