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Involvement of transient receptor potential vanilloid 1 in ectopic pain following inferior alveolar nerve transection in rats. 2012

Suzuro Hitomi, and Masamichi Shinoda, and Ikuko Suzuki, and Koichi Iwata
Department of Biosciences, Kyushu Dental College, 2-6-1 Manazuru, Kitakyushu, Fukuoka 803-8580, Japan.

Chronic pain often develops in the orofacial region after inferior alveolar nerve (IAN) injury. In animal models IAN injury often causes severe neuropathic pain-like behavior in the IAN-innervated region as well as the adjacent region that includes the whisker pad skin. However, the basis for the spreading of pain to adjacent facial areas after IAN injury is still unknown. In this study we determined if the transient receptor potential vanilloid 1 (TRPV1) was associated with altered nocifensive behavior evoked by stimulation of the whisker pad skin following IAN transection. Grooming behavior after capsaicin injection into the whisker pad region was significantly increased after IAN transection and the increase in the behavior was reversed by systemic administration of a TRPV1 antagonist. The number of phosphorylated extracellular signal-regulated kinase immunoreactive (IR) neurons in trigeminal spinal subnucleus caudalis and upper cervical spinal cord following capsaicin injection into the whisker pad region was significantly greater in IAN-transected rats than sham-operated rats. The number of TRPV1-IR trigeminal ganglion (TG) neurons innervating the whisker pad skin was also increased significantly after IAN transection. The present findings suggest that an increase in TRPV1 expression in TG neurons innervating the whisker pad skin after IAN transection may underlie the spreading of pain to the adjacent whisker pad skin.

UI MeSH Term Description Entries
D007150 Immunohistochemistry Histochemical localization of immunoreactive substances using labeled antibodies as reagents. Immunocytochemistry,Immunogold Techniques,Immunogold-Silver Techniques,Immunohistocytochemistry,Immunolabeling Techniques,Immunogold Technics,Immunogold-Silver Technics,Immunolabeling Technics,Immunogold Silver Technics,Immunogold Silver Techniques,Immunogold Technic,Immunogold Technique,Immunogold-Silver Technic,Immunogold-Silver Technique,Immunolabeling Technic,Immunolabeling Technique,Technic, Immunogold,Technic, Immunogold-Silver,Technic, Immunolabeling,Technics, Immunogold,Technics, Immunogold-Silver,Technics, Immunolabeling,Technique, Immunogold,Technique, Immunogold-Silver,Technique, Immunolabeling,Techniques, Immunogold,Techniques, Immunogold-Silver,Techniques, Immunolabeling
D008297 Male Males
D008340 Mandibular Nerve A branch of the trigeminal (5th cranial) nerve. The mandibular nerve carries motor fibers to the muscles of mastication and sensory fibers to the teeth and gingivae, the face in the region of the mandible, and parts of the dura. Alveolar Nerve, Inferior,Auriculotemporal Nerve,Buccal Nerve,Deep Temporal Nerve,Lateral Pterygoid Nerve,Masseteric Nerve,Mental Nerve,Mylohyoid Nerve,Auriculotemporal Nerves,Buccal Nerves,Deep Temporal Nerves,Inferior Alveolar Nerve,Inferior Alveolar Nerves,Lateral Pterygoid Nerves,Mandibular Nerves,Masseteric Nerves,Mental Nerves,Mylohyoid Nerves,Nerve, Auriculotemporal,Nerve, Buccal,Nerve, Deep Temporal,Nerve, Inferior Alveolar,Nerve, Lateral Pterygoid,Nerve, Mandibular,Nerve, Masseteric,Nerve, Mental,Nerve, Mylohyoid,Pterygoid Nerve, Lateral,Pterygoid Nerves, Lateral,Temporal Nerve, Deep,Temporal Nerves, Deep
D009419 Nerve Tissue Proteins Proteins, Nerve Tissue,Tissue Proteins, Nerve
D010766 Phosphorylation The introduction of a phosphoryl group into a compound through the formation of an ester bond between the compound and a phosphorus moiety. Phosphorylations
D002211 Capsaicin An alkylamide found in CAPSICUM that acts at TRPV CATION CHANNELS. 8-Methyl-N-Vanillyl-6-Nonenamide,Antiphlogistine Rub A-535 Capsaicin,Axsain,Capsaicine,Capsicum Farmaya,Capsidol,Capsin,Capzasin,Gelcen,Katrum,NGX-4010,Zacin,Zostrix,8 Methyl N Vanillyl 6 Nonenamide,NGX 4010,NGX4010
D002452 Cell Count The number of CELLS of a specific kind, usually measured per unit volume or area of sample. Cell Density,Cell Number,Cell Counts,Cell Densities,Cell Numbers,Count, Cell,Counts, Cell,Densities, Cell,Density, Cell,Number, Cell,Numbers, Cell
D002934 Cinnamates Derivatives of cinnamic acid (the structural formula: phenyl-HC Cinnamate
D004558 Electric Stimulation Use of electric potential or currents to elicit biological responses. Stimulation, Electric,Electrical Stimulation,Electric Stimulations,Electrical Stimulations,Stimulation, Electrical,Stimulations, Electric,Stimulations, Electrical
D005157 Facial Pain Pain in the facial region including orofacial pain and craniofacial pain. Associated conditions include local inflammatory and neoplastic disorders and neuralgic syndromes involving the trigeminal, facial, and glossopharyngeal nerves. Conditions which feature recurrent or persistent facial pain as the primary manifestation of disease are referred to as FACIAL PAIN SYNDROMES. Craniofacial Pain,Myofacial Pain,Orofacial Pain,Pain, Facial,Face Pain,Neuralgic Facial Pain,Facial Pain, Neuralgic,Pain, Craniofacial,Pain, Face,Pain, Myofacial,Pain, Neuralgic Facial,Pain, Orofacial

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