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Neonatal caffeine administration causes a permanent increase in the dendritic length of prefrontal cortical neurons
Sergio Juárez-Méndez1, Rosalba Carretero, Rubelia Martínez-Tellez
1Escuela de Biología, Universidad Autónoma de Puebla, Puebla, México.
Insights
Neonatal caffeine exposure in rats increased dendritic length in prefrontal cortex neurons. This morphological change in pyramidal cells persisted into adulthood, suggesting long-term effects on brain development.
Area of Science:
- Neuroscience
- Developmental Biology
- Pharmacology
Background:
- The prefrontal cortex (PFC) is crucial for cognitive functions.
- Neonatal brain development is sensitive to environmental factors, including drug exposure.
- Caffeine is a widely consumed stimulant with potential neurodevelopmental effects.
Purpose of the Study:
- To investigate the impact of chronic neonatal caffeine administration on the dendritic morphology of pyramidal neurons in the rat prefrontal cortex.
- To determine if caffeine-induced changes in neuronal structure persist into adulthood.
Main Methods:
- Neonatal rats received daily subcutaneous caffeine injections from postnatal day 1 to 12.
- Pyramidal neuron morphology in layer 3 of the PFC was analyzed at pre-puberty (P35) and post-puberty (P70) using Golgi-Cox staining.
- The Sholl analysis method was employed to quantify dendritic length.
- Locomotor activity was measured before sacrifice.
Main Results:
- Chronic neonatal caffeine administration resulted in a significant increase in the dendritic length of pyramidal neurons in the PFC compared to control groups.
- This effect on dendritic morphology was observed at both pre-pubertal and post-pubertal ages.
- No significant mention of locomotor activity results in the abstract.
Conclusions:
- Neonatal exposure to caffeine can alter the dendritic morphology of prefrontal cortex pyramidal neurons.
- These caffeine-induced structural changes are long-lasting, persisting beyond puberty.
- The findings suggest potential implications for brain processes and cognitive functions influenced by early-life caffeine exposure.
Abstract:
We studied the morphological changes of the dendritic length of the pyramidal neurons of the prefrontal cortex (PFC) induced by the effect of chronic administration of caffeine in the neonatal rat. The caffeine (50 mg/kg, s.c.) was injected from day 1 after birth (P1) to day 12 (P12). The morphology of the pyramidal neurons of layer 3 of the PFC was investigated in these animals at two different ages, before puberty (P35) and after puberty (P70). Before the animals were sacrificed by using overdoses of sodium pentobarbital and being perfused intracardially with 0.9% saline, the locomotor activity in a novel environment was measured. The brains were then removed, processed by the Golgi-Cox stain, and analyzed by the Sholl method. The dendritic morphology clearly showed that the neonatal animals administered caffeine showed an increase in the dendritic length of the pyramidal neurons of the PFC when compared with the control animals at both ages. The present results suggest that neonatal administration of caffeine may in part affect the dendritic morphology of the pyramidal cells of this limbic structure and this effect persists after puberty and may be implicated in several brain processes.
