Hematology/Oncology, Department of Medicine, University of California, Irvine, Irvine, CA, United States.
Division of Hematology, Oncology and Transplantation, Department of Medicine, Vascular Biology Center, University of Minnesota, Minneapolis, MN, United States.
Front Immunol. 2020 Oct 15;11:561947. doi: 10.3389/fimmu.2020.561947. eCollection 2020.
Sickle cell disease (SCD) is a hemoglobinopathy affecting multiple organs and featuring acute and chronic pain. Purkinje cell damage and hyperalgesia have been demonstrated in transgenic sickle mice. Purkinje cells are associated with movement and neural function which may influence pain. We hypothesized that Purkinje cell damage and/or chronic pain burden provoke compensatory gait changes in sickle mice. We found that Purkinje cells undergoe increased apoptosis as shown by caspase-3 activation. Using an automated gait measurement system, MouseWalker, we characterized spatiotemporal gait characteristics of humanized transgenic BERK sickle mice in comparison to control mice. Sickle mice showed alteration in stance instability and dynamic gait parameters (walking speed, stance duration, swing duration and specific swing indices). Differences in stance instability may reflect motor dysfunction due to damaged Purkinje cells. Alterations in diagonal and all stance indices indicative of hesitation during walking may originate from motor dysfunction and/or arise from fear and/or anticipation of movement-evoked pain. We also demonstrate that stance duration, diagonal swing indices and all stance indices correlate with both mechanical and deep tissue hyperalgesia, while stance instability correlates with only deep tissue hyperalgesia. Therefore, objective analysis of gait in SCD may provide insights into neurological impairment and pain states.
镰状细胞病(SCD)是一种影响多个器官的血红蛋白病,其特征是急性和慢性疼痛。在转基因镰状细胞小鼠中已经证明了浦肯野细胞损伤和痛觉过敏。浦肯野细胞与运动和神经功能有关,这可能会影响疼痛。我们假设浦肯野细胞损伤和/或慢性疼痛负担会引起镰状细胞小鼠的代偿性步态变化。我们发现浦肯野细胞经历了更多的细胞凋亡,如 caspase-3 的激活所表明的那样。我们使用自动步态测量系统 MouseWalker,比较了人源化转基因 BERK 镰状细胞小鼠与对照小鼠的时空步态特征。镰状细胞小鼠表现出站立不稳定和动态步态参数(行走速度、站立持续时间、摆动持续时间和特定摆动指数)的改变。站立不稳定的差异可能反映了由于浦肯野细胞损伤导致的运动功能障碍。对角和所有站立指数的改变表明行走时犹豫不决,可能源于运动功能障碍和/或源于对运动诱发疼痛的恐惧和/或预期。我们还证明,站立持续时间、对角摆动指数和所有站立指数与机械性和深部组织痛觉过敏相关,而站立不稳定仅与深部组织痛觉过敏相关。因此,SCD 步态的客观分析可能提供对神经功能障碍和疼痛状态的深入了解。
Front Immunol. 2020
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