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Related Experiment Videos

Changes in renal function in cadmium-intoxicated rats.

Y K Kim1, J K Choi, J S Kim

  • 1Department of Physiology, Kosin Medical College, Pusan, Korea.

Pharmacology & Toxicology
|November 1, 1988
PubMed
Summary
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Cadmium exposure causes excessive urination (polyuria) and reduced urine concentration (hyposthenuria) in rats by impairing kidney function. This is due to proximal tubular damage affecting solute transport and organic anion carriers.

Area of Science:

  • Nephrology
  • Toxicology
  • Biochemistry

Background:

  • Cadmium (Cd) is a toxic heavy metal with known nephrotoxic effects.
  • Renal dysfunction can manifest as altered urine production and solute excretion.
  • Understanding cadmium's impact on kidney transport mechanisms is crucial for assessing its toxicity.

Purpose of the Study:

  • To investigate the effects of cadmium chloride (CdCl2) on renal function in rats.
  • To examine changes in Na+-K+-ATPase activity and para-aminohippuric acid (PAH) transport in the kidney cortex.
  • To elucidate the mechanisms behind cadmium-induced polyuria and impaired PAH excretion.

Main Methods:

  • Rats were treated with subcutaneous injections of CdCl2 (2 mg Cd/kg/day) for 16 days.
  • Renal function was assessed by measuring urine flow, solute excretion (protein, glucose, urea, electrolytes), and creatinine clearance.

Related Experiment Videos

  • Na+-K+-ATPase activity and PAH uptake by renal cortical slices were measured.
  • Kinetic analysis (Vmax, Km) was performed for PAH transport.

    • Main Results:

    • Cadmium treatment induced significant polyuria and hyposthenuria, with increased urinary excretion of protein, glucose, urea, calcium, phosphate, chloride, and potassium.
    • Renal cortical Na+-K+-ATPase activity was significantly inhibited.
    • PAH uptake by renal cortical slices was markedly reduced, primarily due to a decrease in Vmax for active PAH influx.
    • Passive PAH transport and renal oxygen consumption remained unchanged.

    Conclusions:

    • Cadmium-induced polyuria and hyposthenuria result from osmotic diuresis caused by proximal tubular dysfunction and rejection of various filtered substances.
    • Impaired renal PAH excretion in cadmium-treated rats is attributed to the loss of organic anion transporters in proximal tubular basolateral membranes.