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- W1999059908 abstract "Injection of acid into the gastrocnemius muscle results in a persistent, mechanical hyperalgesia of the hindpaw (Sluka et al., 2001). Here, the ability of neurotrophins to alter the development of this secondary hyperalgesia was assessed using transgenic mice and exogenous neurotrophin administration. Acid-induced hyperalgesia was measured in wild-type and transgenic mice that overexpress neurotrophin-3 (NT-3) in muscle ( myo/NT-3 mice). Mechanical and thermal sensitivity of the hindpaws were assessed after injections of acidic saline, pH 4, into the right medial gastrocnemius. Wild-type mice exhibited mechanical but not thermal hyperalgesia in both paws 1 d after acid injection. In contrast, myo/NT-3 mice developed a transient mechanical hyperalgesia in both paws that disappeared by 2-3 d. The reversal of hyperalgesia in myo/NT-3 mice could be mimicked by intramuscular administration of exogenous NT-3 to acid-injected mice but not by other neurotrophins. The route of NT-3 administration appears critical, because intrathecal or intraperitoneal delivery were ineffective. The hyperalgesia could only be reversed by NT-3 treatment concurrent with acid injection and not after the emergence of hyperalgesia. The acid-induced hyperalgesia did not redevelop after the termination of NT-3 treatment, suggesting that NT-3 permanently reversed the hyperalgesia. Consistent with the behavioral data, paw palpation of acid-injected mice significantly increased Fos expression in the spinal cord of wild-type but not myo/NT-3 or NT-3-injected mice. The attenuation of hyperalgesia suggests that NT-3 may be a modulator of muscle-derived pain, and NT-3 may suppress events that lead to secondary hyperalgesia triggered by insult to muscle afferents." @default.
- W1999059908 created "2016-06-24" @default.
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- W1999059908 creator A5057688444 @default.
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- W1999059908 date "2004-10-20" @default.
- W1999059908 modified "2023-09-27" @default.
- W1999059908 title "Neurotrophin-3 Reverses Chronic Mechanical Hyperalgesia Induced by Intramuscular Acid Injection" @default.
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- W1999059908 doi "https://doi.org/10.1523/jneurosci.0899-04.2004" @default.
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