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Distribution of heme oxygenase-2 and NADPH-diaphorase in the spinal trigeminal nucleus of the rat

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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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Correspondence to Fang Huang or Hongwen He.

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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

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