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Effects of morphine on the differentiation and survival of developing pyramidal neurons during the brain growth spurt
Horace Massa1, Claudia-Marvine Lacoh, Laszlo Vutskits
1Department of Anesthesiology, Pharmacology and Intensive Care, University Hospitals of Geneva, 1211 Geneva, Switzerland.
Insights
Morphine, used for infant pain relief, does not harm developing brain cells. This study found no negative effects on neuronal survival or differentiation in young rats, suggesting morphine is safe for the neonatal brain growth spurt.
Area of Science:
- Neuroscience
- Developmental Biology
- Pharmacology
Background:
- Morphine is commonly used for procedural pain in neonates and young children.
- Its effects on developing neural circuitry during the critical brain growth spurt remain largely unknown.
Purpose of the Study:
- To investigate the impact of morphine on neuronal survival and differentiation during the peak synaptogenic period.
- To assess potential neurotoxic effects of morphine in the developing rat brain.
Main Methods:
- Systematic exploration of morphine's effects on the rat medial prefrontal cortex.
- Single bolus and repeated ip injections of morphine.
- Iontophoretic single cell injections with Lucifer Yellow and neuronal arbor tracing.
- Confocal microscopic analysis of dendritic spines.
Main Results:
- Morphine administration did not induce apoptosis in the medial prefrontal cortex at postnatal days 7 or 15.
- Repeated morphine treatment did not interfere with dendritic development of layer 5 pyramidal neurons.
- Neither single nor repeated morphine doses affected dendritic spine density.
Conclusions:
- Preclinical rodent studies suggest morphine does not cause overt neurotoxic effects during the brain growth spurt.
- Findings support the safety of morphine for procedural pain management in neonates and young children regarding brain development.
Abstract:
Although morphine is frequently administered to treat procedural pain in neonates and young children, little is known about the effects of this drug on developing neural circuitry during the brain growth spurt. Here we systematically explored the impact of morphine on neuronal survival and differentiation during the peak synaptogenic period. By focusing on the rat medial prefrontal cortex, we show that single bolus ip injections of morphine, although it induces deep sedation and analgesia, do not entrain apoptosis in this cortical region either at postnatal day 7 or at postnatal day 15. Iontophoretic single cell injections of Lucifer Yellow followed by semiautomatic neuronal arbor tracing revealed that repeated daily administration of this drug between postnatal days 7 and 15 or 15 and 20 did not interfere with dendritic development of layer 5 pyramidal neurons. Confocal microscopic analysis of dendritic spines at the aforementioned distinct stages of the brain growth spurt demonstrated that neither single bolus nor repeated administration of morphine affected the density of these postsynaptic structures. Altogether, these preclinical rodent experimental observations argue against overt neurotoxic effects of morphine exposure during the brain growth spurt.
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