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Oligomycin toxicity in intact rats.

R Kramar, M Hohenegger, A N Srour

    Agents and Actions
    |December 1, 1984
    PubMed
    Summary
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    Oligomycin injection significantly reduces oxygen consumption in rats, impacting liver and muscle. This leads to increased lactate and signs of kidney damage, suggesting potential links to experimental uremia.

    Area of Science:

    • Biochemistry
    • Toxicology
    • Physiology

    Background:

    • Oligomycin is a known inhibitor of mitochondrial ATP synthase.
    • Understanding oligomycin's systemic effects is crucial for assessing its toxicological profile.
    • Mitochondrial dysfunction can impact multiple organ systems.

    Purpose of the Study:

    • To investigate the systemic effects of oligomycin administration in rats.
    • To evaluate the impact of oligomycin on oxygen consumption and metabolic parameters.
    • To assess potential nephrotoxic effects and compare them to experimental uremia.

    Main Methods:

    • Intraperitoneal injection of oligomycin (0.5 mg/kg) in rats.
    • Measurement of arterial pO2, oxygen consumption, and blood metabolites (glucose, pyruvate, lactate, urea).

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  • Monitoring of cardiovascular parameters (heart rate, blood pressure, ECG) and renal function.

    • Main Results:

    • Oligomycin reduced oxygen consumption by approximately 50% with normal arterial pO2.
    • Significant increase in blood lactate levels, leading to compensated metabolic acidosis.
    • Evidence of nephrotoxicity, including oliguria, reduced urea excretion, and increased plasma urea.
    • Triiodothyronine pretreatment did not prevent oligomycin-induced effects.

    Conclusions:

    • Oligomycin induces significant metabolic disturbances, primarily affecting oxygen consumption in liver and muscle tissues.
    • The observed oliguria and altered urea metabolism suggest a nephrotoxic action of oligomycin.
    • The findings provide insights into oligomycin's toxicity and share similarities with effects seen in experimental uremia.