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Thymulin induces c-fos expression in the spinal cord of rats which is reversed by meloxicam and morphine

, : Thymulin induces c-fos expression in the spinal cord of rats which is reversed by meloxicam and morphine. Journal of Neuroimmunology 97(1-2): 16-24, June 1

Intraplantar ( injections of thymulin have been shown to produce hyperalgesia in rats through a prostaglandin E2-dependent mechanism. This study aimed at investigating if such injections can produce sustained activation of spinal neurons by mapping the fos-like-immunoreactivity (FLI) as a marker for this activation. Our results showed that thymulin produces significant and sustained FLI in neurons located in spinal laminae known to be involved in nociception. Pretreatment with either morphine or meloxicam (a cyclooxygenase inhibitor) revealed differential effects on FLI and the hyperalgesia induced by thymulin. These findings support the hypothesis that thymulin can affect central neurons either directly or through the peripheral nerve terminals.


PMID: 10408970

DOI: 10.1016/s0165-5728(99)00031-4

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