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Behavioral and Electrophysiological Evidence for the Differential Functions of TRPV1 at Early and Late Stages of Chronic Inflammatory Nociception in Rats

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Abstract

We previously reported that vanilloid receptor type 1 (VR1, or TRPV1) was up-regulated in dorsal root ganglion (DRG) and the spinal dorsal horn after chronic inflammatory pain produced by complete Freund’s adjuvant (CFA) injection into the plantar of rat hind paw. In the present study, we found that subcutaneous or intrathecal application of capsazepine (CPZ), a TRPV1 competitive antagonist, could inhibit thermal hyperalgesia on day 1 and on day 14 but not on day 28 after CFA injection. With extracellular electrophysiological recording, the effect of CPZ on noxious electrical or heat stimulation evoked responses of wide dynamic range (WDR) neurons in the deep layers of the spinal dorsal horn was evaluated. Under noxious electrical stimulation to sciatic nerve, CPZ applied to the spinal cord produced an inhibition on Aδ- and C-fiber evoked responses of WDR neurons on day 1 and 14, but not on day 28. Under radiant heat stimulation to the receptive field skin, subcutaneous application of CPZ significantly inhibited the background activity and extended the response latency of WDR neurons on day 14. These results provide new evidence for the functional significance of TRPV1 at the early stage, but not the late stage, in the rat model of CFA-induced inflammatory pain.

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Acknowledgements

This work was supported by the grants from National Natural Science Foundation of China (30600173, 30570566 and 30470559), “111” Project of the Ministry of Education of China, “973” program of the Ministry of Science and Technology of China (2007CB512501).

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Authors and Affiliations

  1. Neuroscience Research Institute, Peking University, 38 Xueyuan Road, Beijing, 100083, China

    Hao Luo, Isabella Shi Xu, Yi Chen, Fei Yang, Lu Yu, Guang-Xin Li, Feng-Yu Liu, Guo-Gang Xing, Yu-Shun Shi, Tan Li, Ji-Sheng Han & You Wan

  2. Department of Neurobiology, School of Basic Medical Science, Peking University, 38 Xueyuan Road, Beijing, 100083, China

    You Wan

  3. The Key Laboratory for Neuroscience, The Ministry of Education, The Ministry of Public Health, Peking University, 38 Xueyuan Road, Beijing, 100083, China

    You Wan

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  1. Hao Luo
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  2. Isabella Shi Xu
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  3. Yi Chen
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  4. Fei Yang
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  5. Lu Yu
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  9. Yu-Shun Shi
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  11. Ji-Sheng Han
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Corresponding author

Correspondence to You Wan.

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Special issue article in honor of Dr. Ji-Sheng Han.

Hao Luo, Isabella Shi Xu, Yi Chen are Co-first authors.

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Luo, H., Xu, I.S., Chen, Y. et al. Behavioral and Electrophysiological Evidence for the Differential Functions of TRPV1 at Early and Late Stages of Chronic Inflammatory Nociception in Rats. Neurochem Res 33, 2151–2158 (2008). https://doi.org/10.1007/s11064-008-9751-4

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  • DOI: https://doi.org/10.1007/s11064-008-9751-4

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