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논문 기본 정보

자료유형
학술저널
저자정보
Shin, Dong-Su (Department of Neurosurgery Seoul Medical Center) Kim, Eun-Hyun (Department of Anatomy and Cell Biology College of Medicine Hanyang University) Song, Kwan-Young (Department of Neurosurgery Seoul Medical Center) Hong, Hyun-Jong (Department of Neurosurgery Seoul Medical Center) Kong, Min-Ho (Department of Neurosurgery Seoul Medical Center) Hwang, Se-Jin (Department of Anatomy and Cell Biology College of Medicine Hanyang University)
저널정보
대한신경외과학회 대한신경외과학회지 대한신경외과학회지 제43권 제2호
발행연도
2008.1
수록면
97 - 104 (8page)

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Objective: Transient receptor potential vanilloid subfamily type 1 (TRPV1), a most specific marker of the nociceptive primary afferent, is expressed in peptidergic and non-peptidergic primary afferents innervating skin and viscera. However, its expression in sensory fibers to skeletal muscle is not well known. In this study, we studied the neurochemical characteristics of TRPV1-positive primary afferents to skeletal muscles. Methods: Sprague-Dawley rats were injected with total $20{\mu}l$ of 1% fast blue (FB) into the gastrocnemius and erector spinae muscle and animals were perfused 4 days after injection. FB-positive cells were traced in the L4-L5 (for gastrocnemius muscle) and L2-L4 (for erector spinae muscle) dorsal root ganglia. The neurochemical characteristics of the muscle afferents were studied with multiple immunofluorescence with TRPV1, calcitonin gene-related peptide (CGRP) and $P2X_3$. To identify spinal neurons responding to noxious stimulus to the skeletal muscle, 10% acetic acids were injected into the gastrocnemius and erector spinae muscles and expression of phospho extracellular signal-regulated kinase (pERK) in spinal cords were identified with immunohistochemical method. Results: TRPVl was expressed in about 49% of muscle afferents traced from gastrocnemius and 40% of erector spinae. Sixty-five to 60% of TRPV1-positive muscles afferents also expressed CGRP. In contrast, expression of $P2X_3$ immnoreaction in TRPV1-positive muscle afferents were about 20%. TRPV1-positive primary afferents were contacted with spinal neurons expressing pERK after injection of acetic acid into the muscles. Conclusion: It is consequently suggested that nociception from skeletal muscles are mediated by TRPV1-positive primary afferents and majority of them are also peptidergic.

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