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Biliary secretory function in rats chronically intoxicated with aluminum.

Marcela A Gonzalez1, Marcelo G Roma, Claudio A Bernal

  • 1Human Physiology Area, Litoral National University, Argentina.

Toxicological Sciences : an Official Journal of the Society of Toxicology
|February 21, 2004
PubMed
Summary

Chronic aluminum exposure causes oxidative stress and cholestasis in rats, impairing liver function by reducing organic anion transport and Mrp2 expression.

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Area of Science:

  • Hepatology
  • Toxicology
  • Biochemistry

Background:

  • Chronic aluminum exposure is a potential health concern.
  • Understanding its impact on liver function is crucial.

Purpose of the Study:

  • To investigate the effects of chronic aluminum exposure on biliary secretion and hepatic handling of organic anions.
  • To elucidate the role of oxidative stress and Mrp2 expression in aluminum-induced liver dysfunction.

Main Methods:

  • Male Wistar rats were administered aluminum hydroxide intraperitoneally for 3 months.
  • Assessed serum and hepatic aluminum levels, oxidative stress markers (malondialdehyde, GSH), antioxidant enzyme activities (catalase, GSH peroxidase).
  • Measured bile flow, biliary output of bile salts, cholesterol, and proteins. Analyzed bromosulfophthalein (BSP) plasma decay and Mrp2 expression.

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Main Results:

  • Aluminum exposure significantly increased serum and hepatic aluminum levels.
  • Induced oxidative stress, evidenced by increased malondialdehyde and decreased GSH and antioxidant enzyme activities.
  • Reduced bile flow, biliary output of bile salts, cholesterol, and proteins.
  • Impaired hepatic handling of organic anions, decreasing both sinusoidal uptake and canalicular excretion.
  • Downregulated Mrp2 expression and its substrate (dinitrophenyl-S-glutathione) biliary excretion.

Conclusions:

  • Chronic aluminum exposure induces oxidative stress and cholestasis in rats.
  • It impairs hepatic handling of organic anions by decreasing sinusoidal uptake and canalicular excretion.
  • Impaired Mrp2 expression is a key mechanism underlying the observed dysfunction.