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Related Experiment Videos

Lorazepam administration during embryonic development alters GABAA receptor binding and function.

L G Miller1, C L Weill, R B Roy

  • 1Department of Medicine, LSU Medical Center, New Orleans 70112.

Brain Research. Developmental Brain Research
|December 1, 1988
PubMed
Summary
This summary is machine-generated.

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Prenatal lorazepam exposure in chick embryos altered gamma-aminobutyric acid (GABA) system function. This neurochemical change may explain behavioral alterations observed in young and mature animals after early-life benzodiazepine exposure.

Area of Science:

  • Neuroscience
  • Developmental Neuroscience
  • Pharmacology

Background:

  • Prenatal diazepam exposure is linked to behavioral changes in animals.
  • The underlying neurochemical mechanisms of these behavioral alterations remain unclear.
  • The gamma-aminobutyric acidergic (GABA) system is a key target for benzodiazepines.

Purpose of the Study:

  • To investigate the impact of embryonic exposure to lorazepam on the GABAergic system.
  • To assess changes in GABAA receptor binding and function in chick embryos.
  • To explore the neurochemical basis for prenatal benzodiazepine-induced behavioral effects.

Main Methods:

  • Chick embryos were treated with lorazepam (2 mg/kg) for 2-10 days.
  • Benzodiazepine receptor binding and chloride channel site density were measured in the cortex.

Related Experiment Videos

  • GABAA receptor function was assessed via chloride uptake in cortical synaptoneurosomes.

    • Main Results:

    • Lorazepam administration did not alter benzodiazepine receptor binding.
    • A decrease in chloride channel sites was observed.
    • GABAA receptor function, measured by chloride uptake, was decreased after 10 days of exposure and potentially increased after 4 days.
    • Similar functional alterations were noted with 2- and 4-day treatment periods starting on day 8.

    Conclusions:

    • Chronic embryonic lorazepam exposure alters GABA system binding and function near hatching.
    • These neurochemical modifications may underlie observed prenatal benzodiazepine-induced behavioral changes.
    • The study highlights the sensitivity of the developing GABAergic system to benzodiazepine exposure.