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Organophosphorus insecticide induced decrease in plasma luteinizing hormone concentration in white-footed mice.

B A Rattner, S D Michael

    Toxicology Letters
    |January 1, 1985
    PubMed
    Summary
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    Acute exposure to acephate, an organophosphorus insecticide, significantly inhibited brain acetylcholinesterase (AChE) activity and reduced luteinizing hormone (LH) in mice. These findings suggest potential impacts on reproductive function from insecticide exposure.

    Area of Science:

    • Environmental toxicology
    • Neuroendocrinology

    Background:

    • Organophosphorus insecticides like acephate are widely used, posing potential risks to wildlife.
    • Acetylcholinesterase (AChE) inhibition is a primary mechanism of organophosphate toxicity.
    • Luteinizing hormone (LH) plays a critical role in reproductive function.

    Purpose of the Study:

    • To investigate the effects of acute acephate exposure on brain AChE activity and LH secretion in white-footed mice.
    • To determine if dietary acephate exposure impacts reproductive hormone levels.

    Main Methods:

    • Acute oral intubation of acephate (50 and 100 mg/kg) in white-footed mice.
    • Dietary exposure to acephate (25, 100, and 400 ppm) for 5 days.
    • Measurement of brain AChE activity and plasma LH concentration.

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    Main Results:

    • Oral acephate administration significantly inhibited brain AChE activity and reduced basal LH concentration.
    • Dietary acephate exposure for 5 days inhibited brain AChE activity but did not alter plasma LH levels.
    • A dose-dependent relationship was observed for AChE inhibition.

    Conclusions:

    • Acute acephate exposure can disrupt LH secretion in white-footed mice.
    • Organophosphorus insecticide exposure may have adverse effects on reproductive function.
    • Further research is warranted to elucidate the long-term reproductive consequences.