4.8 Article

Profound alterations in brain tissue linked to hypoxic episode after device implantation

期刊

BIOMATERIALS
卷 278, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.biomaterials.2021.121143

关键词

Implantation generated hypoxia; Neural implant; Insertion forces; Neuronal viability and loss; Neuron-astrocyte interactions

向作者/读者索取更多资源

When implanting devices into the brain, temporary compression-induced hypoxia can lead to adverse alterations in surrounding tissues, such as neuronal apoptosis and reduced metabolic components. By implementing an implantation method that relaxes compressive forces, the damaging effects can be mitigated, resulting in neurons that resemble naive tissues. Additionally, astrocyte proliferation was more pronounced in hypoxic, compressive insertions, with processes potentially interacting with nearby neuronal nuclei. This finding, more prevalent in less hypoxic, force-relaxed insertions, may suggest a novel protective mechanism.
To enable authentic interfacing with neuronal structures in the brain, preventing alterations of tissue during implantation of devices is critical. By transiently implanting oxygen microsensors into rat cortex cerebri for 2 h, substantial and long lasting (>1 h) hypoxia is routinely generated in surrounding tissues; this hypoxia is linked to implantation generated compressive forces. Preferential loss of larger neurons and reduced metabolic components in surviving neurons indicates decreased viability one week after such hypoxic, compressive implantations. By devising an implantation method that relaxes compressive forces; magnitude and duration of hypoxia generated following such an implantation are ameliorated and neurons appear similar to naive tissues. In line with these observations, astrocyte proliferation was significantly more pronounced for more hypoxic, compressive implantations. Surprisingly, astrocyte processes were frequently found to traverse cellular boundaries into nearby neuronal nuclei, indicating injury induction of a previously not described astrocyte-neuron interaction. Found more frequently in less hypoxic, force-relaxed insertions and thus correlating to a more beneficial outcome, this finding may suggest a novel protective mechanism. In conclusion, substantial and long lasting insertion induced hypoxia around brain implants, a previously overlooked factor, is linked to significant adverse alterations in nervous tissue.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.8
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据