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KMID : 0355220090340040387
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Journal of Korean Academy Oral Medicine
2009 Volume.34 No. 4 p.387 ~ p.395
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Nerve Growth Factor and Sensory Neuropeptide Levels in Plasma and Saliva of Various Orofacial Pain Patients
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Jang Min-Uk
Chung Sung-Chang
Chung Jin-Woo
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Abstract
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Nerve growth factor (NGF) and sensory neuropeptides are involved in the process of nociception at peripheral nerve fibers and wide spread in central nervous system. The aims of this study were to investigate NGF and sensory neuropeptides (substance P [SP] and calcitonin gene-related peptide [CGRP]) levels in human plasma and saliva, and the associations between these sensory neuropeptides levels and chronic orofacial pain symptoms. NGF, SP, and CGRP levels in plasma and resting whole saliva samples collected from 67 orofacial pain patients (joint pain, dental or periodontal pain, mucosal pain) and 36 pain free control subjects were measured by enzyme immunoassay. The characteristic pain intensity of each subject was measured using the Graded Chronic Pain Scale and the flow rate of resting whole saliva was measured. Joint pain patients group showed significantly higher plasma NGF level compared to each of dental pain patients (p＜0.01), mucosal pain patients (p＜0.01), and control group (p＜0.01). Plasma NGF level of dental pain patients group was significantly higher than that of control group (p＜0.01). Saliva SP level of dental pain patients group (p＜0.05) and saliva CGRP level of mucosal pain group (p＜0.05) were significantly higher than that of control group. Plasma and saliva SP levels of joint pain patients was significantly associated with pain intensity (plasma: standardized coefficient=0.599, p＜0.01, saliva: standardized coefficient=0.504, p=0.05). In dental pain patients group, plasma SP (standardized coefficient=0.559, p＜0.01), saliva SP (standardized coefficient=0.520, p＜0.01) and saliva CGRP (standardized coefficient=0.599, p＜0.01) levels were significantly associated with age. In mucosal pain patients group, plasma SP (standardized coefficient=0.495, p＜0.05), saliva SP (standardized coefficient=0.500, p＜0.05), and saliva CGRP (standardized coefficient=0.717, p＜0.01) levels were significantly associated with age. NGF and neuropeptides may play a role in the maintenance of various orofacial pain symptoms. The examination of those levels in plasma and saliva helps understanding the mechanism of orofacial pain, and furthermore, can be applied to the diagnosis and therapy of orofacial pain.
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KEYWORD
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Plasma, Saliva, Nerve growth factor, Substance P, Calcitonin gene-related peptide
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