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Formation of the neocortex in mice developing in conditions of prenatal serotonin deficiency
1Department of Morphology, Institute of Experimental Medicine, Russian Academy of Medical Sciences, St. Petersburg.
Abstract:
We report here detailed studies of structural changes occurring in the mouse neocortex formed and stratified in conditions of prenatal experimental blockade of serotonin synthesis. Studies were performed using F1(C57BL/CBA) hybrid mice. Endogenous serotonin levels were decreased by exposure of the mice to parachlorophenylalanine, which inhibits the key serotonin synthesis enzyme tryptophan hydroxylase. Offspring brains were studied at 1, 5 and 10 days (n = 10-15 for each time point) of postnatal development. Controls consisted of intact animals at the same periods of development. These experiments showed that prenatal blockade of serotonin synthesis leads to impaired formation of all neocortical layers, impaired growth, development, and differentiation of neurons, and alterations in neuron shape and size. As postnatal development proceeded, significant numbers of neurons died in the brain structures of these animals.
Insights
Prenatal serotonin synthesis blockade impairs mouse neocortex development, affecting neuronal formation, growth, and survival. This disruption leads to significant neuron loss during postnatal development.
Area of Science:
- Neuroscience
- Developmental Biology
- Neurodevelopmental Disorders
Background:
- Serotonin is a crucial neurotransmitter influencing brain development.
- Prenatal disruptions in serotonin signaling can have long-lasting effects on brain structure and function.
Purpose of the Study:
- To investigate the structural consequences of prenatal serotonin synthesis blockade on mouse neocortex development.
- To analyze the impact on neuronal formation, differentiation, and survival.
Main Methods:
- Utilized F1(C57BL/CBA) hybrid mice for experiments.
- Administered parachlorophenylalanine to inhibit tryptophan hydroxylase and reduce serotonin synthesis prenatally.
- Examined neocortical structures at postnatal days 1, 5, and 10.
Main Results:
- Prenatal serotonin blockade resulted in impaired formation of all neocortical layers.
- Observed deficits in neuronal growth, development, and differentiation, with altered neuron morphology.
- Documented significant postnatal neuron death in affected brain structures.
Conclusions:
- Prenatal serotonin synthesis is essential for normal neocortical layer formation and neuronal development.
- Disruption of serotonin synthesis during critical developmental periods leads to structural abnormalities and neuronal loss.
- These findings highlight the vulnerability of the developing brain to serotonergic system deficits.
