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Temporal and spatial expression of NGF receptor mRNA during postnatal rat brain development analyzed by in situ
W J Friedman1, L Olson, H Persson
1Department of Medical Chemistry, Karolinska Institute, Stockholm, Sweden.
Abstract:
The expression of nerve growth factor (NGF) receptor mRNA was examined in the rat brain during postnatal development using in situ hybridization. Cells expressing NGF receptor mRNA were detected in the basal forebrain at all ages examined, with a peak in expression at 2 weeks of age. NGF receptor mRNA was further demonstrated to be expressed transiently in several brainstem nuclei. Expression of NGF receptor mRNA was high at postnatal day (P) 1 and 1 week of age in the facial and abducens nuclei, but was undetectable in the facial nucleus by 2 weeks of age. In the abducens nucleus, a few labeled cells were still present at 2 weeks of age, but absent by 3 weeks. In the cerebellum, a strong signal was present at P1 and 1 week of age which clearly diminished by 2 weeks and disappeared by 3 weeks of age. The labeled cells in the cerebellum had the size and morphology of developing Purkinje cells. These data suggest that the population of NGF-responsive cells in the brain is more widespread during development than in the adult, and that the trophic requirements of specific brain regions are altered with maturity.
Insights
Nerve growth factor (NGF) receptor mRNA expression in the developing rat brain is widespread, peaking at two weeks. This suggests NGF responsiveness changes significantly from infancy to maturity.
Area of Science:
- Neuroscience
- Developmental Biology
Background:
- Nerve growth factor (NGF) plays a crucial role in neuronal development and survival.
- Understanding the temporal and spatial expression of its receptor is key to deciphering developmental neurobiology.
Purpose of the Study:
- To investigate the expression patterns of nerve growth factor (NGF) receptor mRNA in the developing rat brain.
- To determine the developmental trajectory of NGF receptor expression in specific brain regions.
Main Methods:
- Utilized in situ hybridization to detect NGF receptor mRNA.
- Examined expression across various postnatal ages in the rat brain.
Main Results:
- NGF receptor mRNA was detected in the basal forebrain throughout postnatal development, with peak expression at 2 weeks.
- Transient expression was observed in brainstem nuclei (facial, abducens) and the cerebellum, with expression diminishing by 2-3 weeks.
- Labeled cells in the cerebellum resembled developing Purkinje cells.
Conclusions:
- NGF-responsive cells are more abundant during postnatal development than in adulthood.
- The study highlights dynamic changes in NGF receptor expression, indicating evolving trophic requirements during brain maturation.