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Related Experiment Videos

Dopamine D3 receptor activation modulates renal function in anesthetized rats

G Luippold1, E Küster, T O Joos

  • 1Department of Pharmacology, University of Tübingen, Germany.

Naunyn-Schmiedeberg'S Archives of Pharmacology
|January 8, 1999
PubMed
Summary

The D3 receptor agonist 7-hydroxy-dipropyl-aminotetraline (7-OH-DPAT) enhances kidney function by increasing glomerular filtration rate and sodium excretion in rats. These effects are mediated by D3 receptors in the kidney, influencing renal hemodynamics and tubular function.

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Area of Science:

  • Pharmacology
  • Nephrology
  • Neuroscience

Background:

  • Dopamine receptors, particularly D3 receptors, play roles in various physiological processes.
  • The specific role of D3 receptors in regulating renal function, including hemodynamics and tubular transport, is not fully understood.

Purpose of the Study:

  • To investigate the renal effects of the selective D3 receptor agonist R(+)-7-hydroxy-dipropyl-aminotetraline (7-OH-DPAT).
  • To determine the involvement of D3 receptors in the regulation of glomerular filtration rate (GFR), renal blood flow, and tubular sodium handling.

Main Methods:

  • Standard clearance experiments were performed in anesthetized Sprague-Dawley rats.
  • Infusions of 7-OH-DPAT at varying doses were administered.
  • Renal function parameters, including GFR, arterial blood pressure, heart rate, diuresis, and sodium excretion, were measured.

Related Experiment Videos

  • Reverse transcription-polymerase chain reaction (RT-PCR) was used to detect D3 receptor expression in kidney fractions.
  • Experiments included pretreatment with D2 and D3 receptor antagonists (S(-)-sulpiride and U-99194A, respectively).

    • Main Results:

    • 7-OH-DPAT dose-dependently increased GFR by up to 20%, without significantly affecting arterial blood pressure.
    • At a dose of 1.0 microg kg(-1) min(-1), 7-OH-DPAT induced significant diuresis and increased both absolute and fractional sodium excretion.
    • D3 receptor antagonism with U-99194A abolished these renal effects, while D2 receptor antagonism with S(-)-sulpiride had no effect.
    • RT-PCR confirmed the expression of D3 receptors in both glomerular and tubular kidney fractions.

    Conclusions:

    • The D3 receptor agonist 7-OH-DPAT exerts significant effects on renal hemodynamics and tubular function in rats.
    • These findings demonstrate that D3 receptors are present in the kidney and play a role in regulating renal function.
    • Targeting renal D3 receptors may offer a novel therapeutic approach for modulating kidney function.