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Somatostatin inhibits tooth-pulp-evoked rat cervical dorsal horn neuronal activity

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Abstract

The aim of the present study is to investigate the effect of somatostatin (SST). It is well known that SST is a neuromodulator in the central nervous system and is involved in the regulation of metabolic and neuroendocrine functions. Recent experimental and clinical findings indicate a role for SST in the central processing of nociception. Therefore, we tested the hypothesis whether a local release of SST modulates the tooth-pulp (TP)-evoked upper cervical spinal dorsal horn (C1) neuronal activity, using microiontophoretic application and immunohistochemical techniques. Extracelluar single unit recordings were made from 35 C1 neurons responding to TP electrical stimulation (TPS) in pentobarbital anesthetized rats. Microiontophoretic application of SST (30-70 nA) current dependently inhibited TP-evoked C1 neuronal discharges (60%, 21/35). The inhibition of this discharge by 50 nA SST application was abolished by co-application of a SST2 receptor antagonist (Cyanamid-154806, 50 nA). Immunoreactivity for SST2A receptor was found in the superficial layer (Ι–ΙΙΙ) of C1 dorsal horn. These results suggest that a local release of SST modulates the TP-evoked C1 neuronal activity and this may contribute to a useful therapeutic target for the alleviation of tooth pain and trigeminal hyperalgesia.

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Authors and Affiliations

  1. Department of Physiology, School of Life Dentistry at Tokyo, Nippon Dental University, 1-9-20 Fujimi, Chiyoda-ku, Tokyo, 102-8159, Japan

    M. Takahashi, M. Takeda & S. Matsumoto

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  1. M. Takahashi
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  2. M. Takeda
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  3. S. Matsumoto
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Correspondence to M. Takahashi.

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Takahashi, M., Takeda, M. & Matsumoto, S. Somatostatin inhibits tooth-pulp-evoked rat cervical dorsal horn neuronal activity. Exp Brain Res 184, 617–622 (2008). https://doi.org/10.1007/s00221-007-1261-0

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  • DOI: https://doi.org/10.1007/s00221-007-1261-0

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