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对抗Wnt信号抑制中枢神经系统损伤后的轴突再生

Repulsive Wnt signaling inhibits axon regeneration after CNS injury
Liu Y., Wang X., Lu C.-C., Sherman-Kermen R., Steward O., Xu X.-M., Zou Y.   |   2009/5/29 18:40:20 
Journal of Neuroscience, 2008   |   Volume 28, Issue 33  |   打印| 推荐给好友
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Failure of axon regeneration in the mammalian CNS is attributable in part to the presence of various inhibitory molecules, including myelin-associated proteins and proteoglycans enriched in glial scars. Here, we evaluate whether axon guidance molecules also regulate regenerative growth after injury in adulthood. Wnts are a large family of axon guidance molecules that can attract ascending axons and repel descending axons along the length of the developing spinal cord. Their expression (all 19 Wnts) is not detectable in normal adult spinal cord by in situ hybridization. However, three of them are clearly reinduced after spinal cord injury. Wnt1 and Wnt5a, encoding potent repellents of the descending corticospinal tract (CST) axons, were robustly and acutely induced broadly in the spinal cord gray matter after unilateral hemisection. Ryk, the conserved repulsive Wnt receptor, was also induced in the lesion area, and Ryk immunoreactivity was found on the lesioned CST axons. Wnt4, which attracts ascending sensory axons in development, was acutely induced in areas closer to the lesion than Wnt1 and Wnt5a. Injection of function-blocking Ryk antibodies into the dorsal bilateral hemisectioned spinal cord either prevented the retraction of CST axons or promoted their regrowth but clearly enhanced the sprouting of CST collateral branches around and beyond the injury site. Therefore, repulsive Wnt signaling may be a cause of cortical spinal tract axon retraction and inhibits axon sprouting after injury. Copyright © 2008 Society for Neuroscience.
Correspondence Address: Steward, O.; Reeve-Irvine Center for Neural Regeneration Research, University of California, Irvine, Irvine, CA 92697, United States; email: osteward@uci.edu 
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慢性心衰诊治：规范中求突破
黄峻
2012-2-1
南京医科大学第一附属医院
房颤治疗：手段渐趋丰富 新型治疗药物不断涌现 非药物治疗备受关注
马长生
2012-2-1
首都医科大学附属北京安贞医院
注重老年人群特征 优化管理

刘梅林
2012-2-1
北京大学第一医院老年内科

 
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