Related Experiment Videos
[The neurotoxicity of benzodiazepines]
1Abt. Experimentelle und Klinische Pharmakologie, Institut für Arzneimittel des Bundesgesundheitsamtes.
Abstract:
Molecular and clinical effects of benzodiazepines (BDZs) subsequent to their prenatal and postnatal application to animals and man are reviewed. BDZs interactions with neurotransmitter systems and with metabolic processes are presented and analysed. The experimental data obtained after prenatal application indicate that BDZs can cause malformations, functional deficits and long-lasting behavioural anomalies. The prenatal toxicity of BDZs is probably due to their interaction with neurotransmitter systems. Moreover, a BDZs interaction with mechanisms regulating the excitability of cell membranes and protein synthesis could also play a role. The consequences of prenatal exposition to BDZs in man, particularly their behavioural aspects, have not been sufficiently investigated as yet. Postnatal BDZs application can bring about behavioural disturbances and neurological deficits in animals and man. A part of this pathology can be compensated by means of the functional and structural redundance as well as the tolerance. Limitations in functional and morphological reserves of the nervous system can entail severe disturbances, e.g. cardio-respiratory insufficiency. The pharmacological and toxic BDZs effects could partly be due to their interactions with the same molecular mechanisms. These effects can possibly be mediated through BDZs receptors of the central and peripheral type. Regulatory mechanisms for excitability of cell membranes, cellular energetic processes and protein synthesis seem to be particularly sensitive to the BDZs impacts. A close dosis-effect relation for pharmacological and toxic BDZs effects does not seem to exist.
Insights
Prenatal and postnatal exposure to benzodiazepines (BDZs) can cause developmental issues and behavioral anomalies in animals and humans. These effects stem from BDZs interacting with neurotransmitter systems and cellular processes.
Area of Science:
- Neuroscience
- Pharmacology
- Developmental Biology
Context:
- Benzodiazepines (BDZs) are widely prescribed psychoactive drugs.
- Understanding the long-term effects of prenatal and postnatal BDZ exposure is crucial for public health.
- Existing research highlights potential risks, necessitating a comprehensive review.
Purpose:
- To review the molecular and clinical effects of benzodiazepines (BDZs) following prenatal and postnatal exposure in animal models and humans.
- To analyze the interactions of BDZs with neurotransmitter systems and metabolic processes.
- To evaluate the potential mechanisms underlying BDZ toxicity and long-term consequences.
Summary:
- Prenatal BDZ exposure in animals is linked to malformations, functional deficits, and lasting behavioral anomalies, likely due to neurotransmitter system interactions and effects on cell membrane excitability and protein synthesis.
- Postnatal BDZ exposure can induce behavioral disturbances and neurological deficits in both animals and humans.
- While some effects can be compensated by biological redundancy and tolerance, severe outcomes like cardio-respiratory insufficiency may occur when nervous system reserves are limited.
- Pharmacological and toxic effects of BDZs may share molecular mechanisms, potentially mediated by central and peripheral BDZ receptors.
- Cellular mechanisms regulating membrane excitability, energy metabolism, and protein synthesis appear particularly vulnerable to BDZ impacts.
- A clear dose-effect relationship for BDZ effects is not consistently observed.
Impact:
- This review underscores the potential risks associated with prenatal and postnatal benzodiazepine exposure, particularly concerning neurodevelopmental and behavioral outcomes.
- It highlights the need for further investigation into the long-term behavioral consequences in humans exposed prenatally.
- Findings emphasize the sensitivity of fundamental cellular processes to benzodiazepines, informing clinical practice and drug development.
- The study suggests that benzodiazepine effects, both therapeutic and toxic, may involve common molecular pathways, warranting careful consideration of dosage and duration of use.