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Nitroxidergic system in human trigeminal ganglia neurons: a quantitative evaluation
Elisa Borsani1, Sara Giovannozzi, Ramon Boninsegna
1Division of Human Anatomy, Department of Biomedical Sciences and Biotechnologies, University of Brescia, Viale Europa 11, 25123 Brescia, Italy.
Acta Histochemica
|September 8, 2009
Summary
Nitric oxide (NO) plays a key role in trigeminal ganglia, acting as a messenger molecule. This study found that the enzyme neuronal nitric oxide synthase (nNOS) is primarily present in large trigeminal neurons.
Area of Science:
- Neuroscience
- Molecular Biology
- Cell Biology
Background:
- Trigeminal ganglia transmit orofacial sensory information.
- Nitric oxide (NO) acts as a messenger in trigeminal neurons.
- NO is synthesized by neuronal (nNOS) and inducible (iNOS) nitric oxide synthase enzymes.
Purpose of the Study:
- To analyze trigeminal neuron distribution by size (small, medium, large).
- To correlate NOS-immunopositive neuron percentages with neuronal size.
- To investigate the role of the nitroxidergic system in trigeminal neurotransmission.
Main Methods:
- Immunohistochemistry to detect nNOS and iNOS.
- Neuron counting and size classification.
- Statistical analysis of NOS-positive neuron distribution.
Main Results:
- A significant correlation exists between nNOS-immunopositive neurons and neuronal size.
- Approximately 50% of trigeminal neurons are nNOS-immunopositive.
- nNOS-positive neurons are predominantly large-sized.
- iNOS immunolabelling was minimal across all neuron types.
Conclusions:
- The nitroxidergic system, particularly nNOS in large neurons, is prominent in human trigeminal ganglia.
- This suggests a significant role for NO in trigeminal neurotransmission.
- Further research into the nitroxidergic system's function in orofacial pathways is warranted.
