A reassessment of whether cortical motor neurons die following spinal cord injury.

A reassessment of whether cortical motor neurons die following spinal cord injury.
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DOI:
10.1002/cne.22661
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发表时间:
2011-10-01
影响因子:
2.5
通讯作者:
Steward, Oswald
Steward, Oswald
中科院分区:
医学3区
文献类型:
--
作者:
Nielson, Jessica L.;Strong, Melissa K.;Steward, Oswald

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在过去的世纪,脊髓损伤(SCI)后皮质脊髓束(CST)起源细胞是否死亡的问题一直存在争议。最近的一项研究报道了在T9处由SCI引起的轴突损伤后,逆行标记的皮质运动神经元损失约20%(J.Comp.Neurol. 462:328-341)。然而,在后续的研究中,我们没有发现任何证据表明,损失的CST轴突在髓锥体,这必须发生,如果CST神经元死亡。在这里,我们试图通过使用与Hains等人相同的技术重新评估CST神经元的可能损失来解决这种差异(对细胞死亡标记物的逆行标记和染色进行定量分析,包括TUNEL和Hoechst标记细胞核)。在胸9级(T9)或颈5级(C5)侧半切背索病变后,我们的结果显示没有证据表明逆行标记的神经元丢失,也没有证据表明轴突切断的皮质运动神经元TUNEL染色。这些结果表明,CST细胞体在SCI后不发生逆行性细胞死亡,因此靶向这种细胞死亡不是有效的治疗靶点。神经学比较杂志519:2852-2869,2011。
Over the past century, the question of whether the cells of origin of the corticospinal tract (CST) die following spinal cord injury (SCI) has been debated. A recent study reported an approximately 20% loss of retrogradely labeled cortical motoneurons following damage to their axons resulting from SCI at T9 ( J. Comp. Neurol. 462:328–341). In follow-up studies, however, we failed to find any evidence of loss of CST axons in the medullary pyramid, which must occur if CST neurons die. Here, we seek to resolve the discrepancy by re-evaluating possible loss of CST neurons using the same techniques as Hains et al. (quantitative analysis of retrograde labeling and staining for cell death markers including TUNEL and Hoechst labeling of the nuclei). Following either dorsal funiculus lesions at thoracic level 9 (T9) or lateral hemisection at cervical level 5 (C5), our results reveal no evidence for a loss of retrogradely labeled neurons and no evidence for TUNEL staining of axotomized cortical motoneurons. These results indicate that CST cell bodies do not undergo retrograde cell death following SCI, and therefore targeting such cell death is not a valid therapeutic target. J. Comp. Neurol. 519:2852–2869, 2011.
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