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Related Experiment Videos

Platelet-activating factor dilates efferent arterioles through glomerulus-derived nitric oxide

S Arima1, Y Ren, L A Juncos

  • 1Department of Medicine and Heart and Vascular Institute, Henry Ford Hospital, Detroit, MI, USA.

Journal of the American Society of Nephrology : JASN
|January 1, 1996
PubMed
Summary

Platelet-activating factor (PAF) at low doses dilates efferent arterioles by releasing nitric oxide (NO) from the glomerulus. At higher doses, PAF constricts these vessels partly via cyclooxygenase metabolites.

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Area of Science:

  • Nephrology
  • Renal Physiology
  • Vascular Biology

Background:

  • Platelet-activating factor (PAF) is produced in the glomerulus, but its direct effects on glomerular microcirculation are not fully understood.
  • Previous research indicated PAF dilates afferent arterioles via nitric oxide (NO) at picomolar concentrations.

Purpose of the Study:

  • To investigate the hypothesis that PAF acts on the glomerulus to release NO, influencing efferent arteriole (Ef-Art) resistance.
  • To determine the concentration-dependent effects of PAF on rabbit Ef-Art, examining both dilation and constriction.

Main Methods:

  • Rabbit Ef-Art were perfused retrogradely (RP) to exclude glomerular influence or orthogradely (OP) to include it.
  • Vessels were preconstricted with norepinephrine, and varying doses of PAF were applied.

Related Experiment Videos

  • The role of NO and cyclooxygenase metabolites in PAF's action was assessed using specific inhibitors.

    • Main Results:

    • PAF at picomolar concentrations caused significant dilation of Ef-Art only during OP, indicating glomerular involvement.
    • This dilation was abolished by NO-synthesis inhibition.
    • PAF at nanomolar concentrations caused constriction in both RP and OP, which was attenuated by indomethacin.

    Conclusions:

    • PAF stimulates the glomerulus to release NO, leading to Ef-Art dilation at picomolar concentrations.
    • PAF induces Ef-Art constriction at nanomolar concentrations, mediated partly by cyclooxygenase metabolites.
    • PAF plays a role in regulating glomerular hemodynamics in physiological and pathological states.