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Severe functional and structural changes caused by lithium in the developing rat kidney

S Christensen, P D Ottosen, S Olsen

    Acta Pathologica, Microbiologica, Et Immunologica Scandinavica. Section A, Pathology
    |July 1, 1982
    PubMed
    Summary
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    Post-natal lithium exposure in rats significantly impairs kidney development, causing growth retardation and reduced kidney function. Prenatal lithium exposure had minimal effects on the developing kidney.

    Area of Science:

    • Nephrology
    • Developmental Biology
    • Toxicology

    Background:

    • Lithium (Li) is used to treat bipolar disorder.
    • Its effects on the developing kidney are not fully understood.
    • Assessing developmental toxicity is crucial for patient safety.

    Purpose of the Study:

    • To investigate the impact of lithium exposure during pregnancy and post-natal development on rat kidney function and structure.
    • To determine the sensitivity of the developing kidney to lithium's nephrotoxic effects.

    Main Methods:

    • Rats were administered lithium during maternal pregnancy and/or for 8 weeks post-natally.
    • Plasma lithium levels were monitored.
    • Renal function (glomerular filtration rate, concentrating ability) and kidney structure were assessed.

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  • Morphometric analysis quantified tubular cell volume.

    • Main Results:

    • Post-natal lithium exposure caused growth retardation, polyuria, reduced concentrating ability, and uremia.
    • Glomerular filtration rate (GFR) decreased by up to 80% after post-natal lithium exposure.
    • Severe structural changes included cortical cysts, interstitial fibrosis, and tubular atrophy.
    • Prenatal lithium exposure alone had minimal effects on renal function and structure.
    • Post-natal lithium exposure showed a significant correlation between structural changes and reduced GFR.

    Conclusions:

    • The developing rat kidney is highly sensitive to lithium's nephrotoxic effects during the post-natal period.
    • Post-natal lithium exposure impairs renal function and leads to uremia.
    • Prenatal lithium exposure has limited long-term effects on renal function and structure when evaluated post-natally.