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Bile acids, oxidative stress, and renal function in biliary obstruction
1Department of Pharmacology, Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel.
Seminars in Nephrology
|November 14, 1997
Summary
Bile acids and oxidative stress contribute to kidney dysfunction in biliary obstruction. These factors impair renal function by altering electrolyte balance and causing vasoconstriction, leading to renal failure.
Area of Science:
- Nephrology
- Hepatology
- Biochemistry
Background:
- Biliary obstruction is associated with renal dysfunction.
- Plasma accumulation of bile acids and increased oxidative stress are implicated.
- Bile acids can disrupt renal electrolyte and water handling.
Purpose of the Study:
- To elucidate the mechanisms by which bile acids and oxidative stress contribute to renal dysfunction in biliary obstruction.
Main Methods:
- Review of proposed mechanisms involving bile acid effects on renal tubules.
- Examination of oxidative stress pathways in liver disease and their renal impact.
- Analysis of vasoactive mediators implicated in reduced glomerular filtration rate.
Main Results:
- Bile acids block the Na(+)-H+ antiport, altering renal handling of water and electrolytes.
- Oxidative stress, exacerbated by bile acids, damages tubular cells and promotes reactive oxygen species.
- Vasoactive mediators like endothelin-1 and F2-isoprostanes are formed, causing renal vasoconstriction and reduced glomerular filtration.
Conclusions:
- Plasma bile acids and oxidative stress are key factors in the renal dysfunction seen with biliary obstruction.
- These mechanisms lead to impaired renal function and can precipitate renal failure.