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[Ontogenesis of anesthesia-relevant receptors]
1Klinik für Anästhesiologie und operative Intensivmedizin, Olgahospital, Stuttgart.
Insights
Pediatric drug responses are influenced by immature brain development and changing receptor systems. Understanding receptor ontogenesis explains unique drug reactions in infants, aiding safer medical treatments.
Area of Science:
- Neuroscience
- Developmental Biology
- Pharmacology
Context:
- Pediatric drug therapy presents unique challenges due to organ and brain immaturity in neonates and infants.
- Maturation deficits in neural transmission, from electric nerve signals to neurotransmitter propagation, impact drug responses.
- Receptor system ontogenesis is crucial, not just for mature function but for neuronal pathway development and cell differentiation.
Purpose:
- To review the ontogenesis of key receptor systems, including opioid, NMDA, GABA, dopamine, acetylcholine, and serotonin receptors.
- To correlate receptor number and distribution changes during development with observed drug effects in pediatric populations.
- To explain unique pediatric drug reactions, such as respiratory depression with opioids and paradoxical reactions to benzodiazepines, based on developmental pharmacology.
Summary:
- Receptor systems undergo dynamic changes in number and distribution during development, following various patterns (e.g., continuous increase, peak and decline).
- These developmental changes in receptors are critical for neuronal maturation and synaptic plasticity.
- Pharmacological data from human and animal studies illustrate how receptor ontogenesis underlies specific pediatric drug responses.
Impact:
- Provides a framework for understanding differential drug efficacy and safety in pediatric patients.
- Informs the development of more precise and safer medication strategies for neonates, infants, and children.
- Highlights the importance of considering developmental neuropharmacology in clinical practice.
Abstract:
The particularities in the medical treatment of children, especially those concerning premature infants, new-borns and babies, do not only stem from the immaturity of the organs (kidneys, liver etc.) but also from pharmacokinetic factors which are result of the immaturity of the brain. There are maturation deficits on all levels of transmission, from the nerve with electric transmission to the synapsis with neurotransmitter propagation, even though the whole system is basically laid out. The presented paper concerns itself mainly with the ontogenesis of the receptor-systems, a small part is dedicated to the question of myelination. Number and distribution of the receptors in premature or new-born infants and babies should not only be viewed in the context of the future function in mature humans (i.e. transmission and modification of information) - the receptors themselves are important factors in the maturing process of neuronal pathways, synapses and the differentiation of the neuronal cells themselves. Basically the number of receptors can change as follows: 1. Continuous increase until maturity, 2. Increase to a maximum during maturation with slight or stronger decrease after, 3. High initial number with following distinct decrease, 4. Even number throughout maturation, 5. Passing expression during maturation. The aim of this paper is to present an overview on the ontogenesis of opioid-, NMDA-, GABA-, dopamine-, acetylcholine- and serotoninreceptors. The data derived from animal and human-pharmacological experiments will be used to carefully conclude how the particularities of drug reactions of children (i.e. increased respiratory depression after opioid application in premature and newborn infants, higher incidence of paradox reactions to benzodiazepines etc.) can be explained.