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[Renal function in white rats after tiroxin injection preceded by blockade of ACE and nitrogen oxide]

V N Zaporozhan, S I Dolomatov

    Aviakosmicheskaia I Ekologicheskaia Meditsina = Aerospace and Environmental Medicine
    |August 22, 2008
    PubMed

    Insights

    Thyroxine (T4) impacts kidney function, decreasing creatinine clearance and increasing protein excretion. Blocking nitric oxide (NO) synthesis or angiotensin-converting enzyme (ACE) with captopril alters these effects, highlighting complex renal responses.

    Area of Science:

    • Nephrology
    • Endocrinology
    • Pharmacology

    Background:

    • Thyroxine (T4) administration can influence renal function.
    • Nitric oxide (NO) and the renin-angiotensin-aldosterone system (RAAS) play critical roles in regulating kidney physiology.
    • Understanding the interplay between T4, NO, and ACE is crucial for managing renal health.

    Purpose of the Study:

    • To investigate the effects of exogenous thyroxine (T4) on renal function in rats.
    • To examine how non-selective NO-synthase blockade or angiotensin-converting enzyme (ACE) inhibition modifies T4-induced renal changes.
    • To elucidate the specific roles of NO and ACE pathways in mediating T4's impact on the kidneys.

    Main Methods:

    • Male Wistar rats were administered T4 intragastrically.
    • Animals were pre-treated with captopril (ACE inhibitor) or N(omega)-NLA (NO-synthase blocker).
    • Renal function was assessed by measuring urine and plasma osmolality, creatinine clearance, proteinuria, and nitrogen oxide levels.

    Main Results:

    • T4 administration moderately decreased creatinine clearance and increased proteinuria, urinary osmolality, and excretion of nitrites and nitrates.
    • Captopril pre-treatment intensified diuresis but reduced the excretion of osmotically active substances (OAS) and nitrites in response to T4, without preventing reduced creatinine clearance or proteinuria.
    • NO synthesis pre-block significantly decreased creatinine clearance, OAS excretion, and nitrites, while moderating diuresis compared to T4-only treated rats.

    Conclusions:

    • Exogenous thyroxine significantly alters renal function, impacting creatinine clearance, proteinuria, and nitrogen oxide metabolism.
    • The ACE pathway, while influencing diuresis and excretion, does not fully prevent T4-induced renal dysfunction.
    • NO synthesis inhibition markedly exacerbates T4-induced reductions in renal function, underscoring the protective role of NO in this context.

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