Abstract
Tenascin-C (TNC), a matricellular protein, is upregulated in brain parenchyma after experimental subarachnoid hemorrhage (SAH). Recent studies emphasize that early brain injury (EBI) should be overcome to improve post-SAH outcomes. The aim of this study was to investigate effects of TNC knockout (TNKO) on neuronal apoptosis and neuroinflammation, both of which are important constituents of EBI after SAH. C57BL/6 wild-type (WT) mice or TNKO mice underwent sham or filament perforation SAH modeling. Twenty-five WT mice and 25 TNKO mice were randomly divided into sham+WT (n = 10), sham+TNKO (n = 8), SAH+WT (n = 15), and SAH+TNKO (n = 17) groups. Beam balance test, neurological score, terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling staining, immunostaining of Toll-like receptor 4 (TLR4), and Western blotting were performed to evaluate neurobehavioral impairments, neuronal apoptosis, and neuroinflammation at 24 h post-SAH. Deficiency of TNC significantly alleviated post-SAH neurobehavioral impairments and neuronal apoptosis. The protective effects of TNKO on neurons were associated with the inhibition of a caspase-dependent apoptotic pathway, which was at least partly mediated by TLR4/nuclear factor-κB/interleukin-1β and interleukin-6 signaling cascades. This study first provided the direct evidence that TNC causes post-SAH neuronal apoptosis and neuroinflammation, potentially leading to the development of a new molecular targeted therapy against EBI.
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Acknowledgements
We thank Ms. Chiduru Yamamoto (Department of Neurosurgery, Mie University Graduate School of Medicine) for her technical assistance.
Funding
This study was funded by a Grant-in-Aid for Scientific Research from Japan Society for the Promotion of Science to Dr. Fujimoto (15 K19962), and Mie Medical Research Foundation to Dr. Suzuki.
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All procedures were approved by the Animal Ethics Review Committee of Mie University and were carried out according to the institution’s Guidelines for Animal Experiments.
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Liu, L., Fujimoto, M., Nakano, F. et al. Deficiency of Tenascin-C Alleviates Neuronal Apoptosis and Neuroinflammation After Experimental Subarachnoid Hemorrhage in Mice. Mol Neurobiol 55, 8346–8354 (2018). https://doi.org/10.1007/s12035-018-1006-z
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DOI: https://doi.org/10.1007/s12035-018-1006-z