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Expression of nitric oxide synthase in the developing rat hippocampus
G C Moritz1, F Tenorio, S Allodi
1Departamento de Histologia e Embriologia, Instituto de Ciencias Biomedicas, UFRJ, Cidade Universitaria, Rio de Janeiro, Brazil.
Neuroscience Letters
|April 23, 1999
Summary
Nitric oxide synthase (NOS) is present in the postnatal rat hippocampus from birth, but its expression is delayed in the dentate gyrus. This suggests NO plays a role in hippocampal development and connection formation.
Area of Science:
- Neuroscience
- Developmental Biology
Background:
- Nitric oxide (NO) is a signaling molecule implicated in various physiological processes.
- Understanding the developmental role of NO in the hippocampus is crucial for comprehending neural circuit formation.
Purpose of the Study:
- To investigate the developmental expression pattern of nitric oxide synthase (NOS) in the postnatal rat hippocampus.
- To correlate the timing of NOS expression with known hippocampal developmental events.
Main Methods:
- Nicotinamide adenine dinucleotide phosphate-diaphorase (NADPH-d) histochemistry was employed.
- Postnatal rat hippocampi were analyzed from birth to adulthood.
Main Results:
- NADPH-d reactivity, indicating NOS activity, was observed in the Ammon's horn from postnatal day 1 through adulthood.
- The dentate gyrus exhibited delayed NOS expression, with staining appearing by the end of the first postnatal week.
Conclusions:
- The developmental timeline of NOS expression in the hippocampus varies between regions (Ammon's horn vs. dentate gyrus).
- The observed temporal correlation suggests NO involvement in the development of hippocampal circuitry and synaptic connections.