Abstract
Heme oxygenase (HO)/carbon monoxide (CO) and nitric oxide synthase (NOS)/nitric oxide (NO) systems are involved in sensory information processing. The present study was undertaken to examine the distribution of HO-2 and NOS in the spinal trigeminal nucleus (STN) of the rat, using histochemistry and immunohistochemistry. Nicotinamide adenine dinucleotide phosphate-diaphorase (NADPH-d) staining was found that NADPH-d activity was more prominent in the nucleus caudalis (Vc) and the dorsomedial subdivision of the nucleus oralis (Vo) than in other spinal trigeminal regions. Immunohistochemistry for HO-2 revealed that HO-2 staining neurons distributed extensively, which intensity was higher in the rostral than caudal part of the STN. The colocalization of NADPH-d and HO-2 was mainly confined in the Vc. The expression and distribution of NADPH-d and HO-2 suggest that NO and CO are likely neurotransmitters and might function in the processing orofacial signal in the STN together.
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Abbreviations
- CNS:
-
Central nervous system
- CO:
-
Carbon monoxide
- DAB:
-
Diaminobenzidine
- DMSp5:
-
Dorsalmedial spinal trigeminal nucleus
- eNOS:
-
Endothelial NOS
- HO:
-
Heme oxygenase
- iNOS:
-
Inducible NOS
- NADPH:
-
Nicotinamide adenine dinucleotide phosphate
- NADPH-d:
-
NADPH-diaphorase
- NBT:
-
Nitroblue tetrazolium
- nNOS:
-
Neuronal NOS
- NO:
-
Nitric oxide
- NOS:
-
Nitric oxide synthase
- STN:
-
Spinal trigeminal nucleus
- Vc:
-
Nucleus caudalis
- Vi:
-
Nucleus interpolaris
- Vo:
-
Nuleus oralisc
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (NO: 30070952; 30472248) and Science and Technology Planning Project of Guangdong Province, China (NO: 2006B35601007).
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Fan, W., Huang, F., Dong, W. et al. Distribution of heme oxygenase-2 and NADPH-diaphorase in the spinal trigeminal nucleus of the rat. J Mol Hist 40, 209–215 (2009). https://doi.org/10.1007/s10735-009-9232-3
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DOI: https://doi.org/10.1007/s10735-009-9232-3