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Neuropathic pain can result from a peripheral or central nervous system lesion and is refractory to analgesic therapy [1-2]. Clinical symptoms commonly include stimulus- independent pain (spontaneous pain) and stimulus-evoked pain (hyperalgesia or allydynia) [2]. Of all symptoms in patients with painful neuropathy, spontaneous pain is the most burdensome [2]. Unfortunately, the behavior of spontaneous pain is more difficult occurred than stimulus-evoked pain. So there are few studies on spontaneous pain. The behavior of spontaneous pain was expressed strongly in mSNA rats [3, 25]. Lee DH [3] suggested that spontaneous pain is induced by inflammation, which was evoked by L5 SNL plus the L4 chromic gut loop in mSNA rats. Nerve injury is followed by Wallerian degeneration. A large number of proinflammatory mediators including cytokines, growth factors and proteases, are released from schwann cells, microglia cells and neuron cells [4-5,9]. And the inflammation response is the basis of neuropathic pain. TNF¦Áis the first cytokines that plays a critical role in setting the cytokine network, contributing to macrophage recruitment to inflammatory site[6]. So TNF¦Áappears to play a key role for the induction of neuropathic pain following never injury[7-9]. However, the results are based on studying in stimulus-evoked pain, do not show the effect of TNF¦Áin spontaneous pain. The cellular immediate early gene c-fos is transiently induced in numerous cell types by many kinds of stimuli and conditions [10]. While the expression of c-fos is suppressed by various means, the pain behavior could be alleviated in the neuropathic pain rats [11-13]. And the result is also in the inflammatory pain rats [14]. So some people suggest using c-fos as a neural marker of pain [15]. However, as previously described in many other studies, c-fos is not a neural marker of the spontaneous pain [16-17]. Thus the relationship between c-fos and pain is not clear until now. Minocycline is a second generation semi-synthetic tetracycline that penetrates well into the central nervous system via blood-brain barrier. And it is a strong anti-inflammatory drug, which is used extensively in the studies of stimulus-evoked pain. And all studies indicated that the inflammatory response was suppressed with minocycline pre-surgery, then the symptoms of stimulus-evoked pain alleviated too [18-21]. Minocycline was able to suppress c-fos expressing in spinal dorsal horn as Cho IK reported [14]. What is minocycline effect on the expression of c-fos and TNF¦Á? We verified the effect of TNF¦Áand c-fos in the spontaneous pain with mSNA rats. We also verified that effect of minocycline in the spontaneous pain in our study. [ Last edited by ·ç·ç1ºÅ on 2008-5-8 at 07:47 ] |
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the behavior of spontaneous pain is more difficult occurred than stimulus-evoked pain. So there are few studies on spontaneous pain. ÕâÀï¸öÈ˸оõoccurredÓôíÁË£¬¿ÉÒԸijÉto be occurred»òÕßoccurring The behavior of spontaneous pain was expressed strongly in mSNA rats [3, 25]. Lee DH [3] suggested that spontaneous pain is induced by inflammation ÕâÀïwasҪȥµô However, the results are based on studying in stimulus-evoked pain, do not show the effect of TNF¦Áin spontaneous pain. do not ǰ¼ÓÒ»¸öÁ¬´Ê°É the pain behavior could be alleviated in the neuropathic pain rats ¸Ä³Éthe pain behavior of the neuropathic pain rats could be alleviated And the result is also in the inflammatory pain rats Õâ¾ä»°×îºÃ¸Ä³ÉAnd the result is the same in the inflammatory pain rats So some people suggest using c-fos as a neural marker of pain Õâ¸ö£¬ÓÃpeople²»ÊǺܺðɣ¬ÓÃexpertʲôµÄºÃµã°É ßÀ£¬Çë¸÷λ¸ßÊÖÖ¸Õý£¬ºÇºÇ£¬Óï·¨²¢·ÇżµÄÇ¿Ïî¡« |

2Â¥2008-05-07 21:15:53
zy830226
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3Â¥2008-05-07 21:23:11
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4Â¥2008-05-07 21:38:09
Elvis2008
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ÓÐÒìÒéµÄµØ·½ÒѾÓÃÒýºÅ±íÆðÀ´ÁË£¬¿ÉÒÔÔÚºÍÆäËûÈËÉÌÁ¿Ò»Ï¡£Ð´µÃ²»´í£¡ Neuropathic pain can result from a peripheral or central nervous system lesion and is refractory to analgesic therapy [1-2]. Clinical symptoms commonly include stimulus- independent pain (spontaneous pain) and stimulus-evoked pain (hyperalgesia or allydynia) [2]. Of all symptoms in patients with painful neuropathy, spontaneous pain is the most burdensome [2]. Unfortunately,¡° the behaviors of spontaneous pain occur more difficultly than stimulus-evoked pain.¡± So there are few studies on spontaneous pain. The behavior of spontaneous pain was expressed strongly in mSNA rats [3, 25]. Lee DH [3] suggested that spontaneous pain ¡°was¡± induced by inflammation, which was evoked by L5 SNL plus the L4 chromic gut loop in mSNA rats. Nerve injury is followed by Wallerian degeneration. A large number of proinflammatory mediators including cytokines, growth factors and proteases,¡°which¡±are released from schwann cells, microglia cells and neuron cells [4-5,9]. And the inflammation response is the basis of neuropathic pain. TNF¦Á is the first cytokines that ¡°play¡± a critical role in setting the cytokine network, contributing to macrophage recruitment to inflammatory site[6]. So TNF¦Á appears to play a key role for the induction of neuropathic pain following never injury[7-9]. However, the results ¡° base¡± on studying in stimulus-evoked pain, do not show the effect of TNF¦Á in spontaneous pain. The cellular immediate early gene c-fos is transiently induced in numerous cell types by many kinds of ¡°stimulis¡± and conditions [10]. While the expression of c-fos is suppressed by various means, the pain behavior could be alleviated in the neuropathic pain rats [11-13]. And the result is also in the inflammatory pain rats [14]. So some people suggest using c-fos as a neural marker of pain [15]. However, as previously described in many other studies, c-fos is not a neural marker of the spontaneous pain [16-17]. Thus the relationship between c-fos and pain is not clear until now. Minocycline is a second generation semi-synthetic tetracycline that penetrates well into the central nervous system via blood-brain barrier. And it is a strong anti-inflammatory drug, which is used extensively in the studies of stimulus-evoked pain. And all studies indicated that the inflammatory response was suppressed with minocycline pre-surgery, then the symptoms of stimulus-evoked pain alleviated too [18-21]. Minocycline was able to suppress c-fos expressing in spinal dorsal horn as Cho IK reported [14]. What is ¡°the effect of minocycline¡± on the expression of c-fos and TNF¦Á? We verified the effect of TNF¦Á and c-fos in the spontaneous pain with mSNA rats. We also verified that¡° the¡± effect of minocycline in the spontaneous pain in our study. |

5Â¥2008-05-07 21:39:44














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