Abstract
Background and purpose: The authors have reported that tenascin-C (TNC), a matricellular protein, is induced after subarachnoid hemorrhage (SAH), associated with cerebral vasospasm. In this study, we examined whether TNC alone causes cerebral vasospasm-like constriction of the intracranial internal carotid arteries (ICAs) in rats, focusing on the p38 mitogen-activated protein kinase (MAPK)-mediated mechanisms.
Methods: First, we injected 10 μg of TNC into the cisterna magna of healthy rats and studied morphologically whether TNC caused constriction of the left ICA at 24–72 h after administration. Second, we examined the effect of SB203580 (a p38 MAPK inhibitor) on the vessel diameter of the left ICA in healthy rats at 24 h. Third, we evaluated the effect of SB203580 on TNC-induced constriction of the left ICA in healthy rats at 24 h.
Results: TNC significantly induced cerebral vasospasm-like angiographic constriction of the left ICAs, which continued at least for 72 h. SB203580 itself had no effect on the diameter of normal ICAs, but abolished the TNC-induced vasoconstrictive effect on the left ICA.
Conclusion: These findings show that TNC causes left ICA constriction via activation of p38 MAPK, resembling post-SAH vasospasm, and suggest the possible involvement of TNC in the pathogenesis of cerebral vasospasm.
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Acknowledgements
We thank Ms. Chiduru Yamamoto (Department of Neurosurgery, Mie University Graduate School of Medicine) for her technical assistance. This work was supported in part by a Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science to Dr. Suzuki.
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We declare that we have no conflict of interest.
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Fujimoto, M. et al. (2015). Vasoconstrictive Effect of Tenascin-C on Cerebral Arteries in Rats. In: Fandino, J., Marbacher, S., Fathi, AR., Muroi, C., Keller, E. (eds) Neurovascular Events After Subarachnoid Hemorrhage. Acta Neurochirurgica Supplement, vol 120. Springer, Cham. https://doi.org/10.1007/978-3-319-04981-6_17
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DOI: https://doi.org/10.1007/978-3-319-04981-6_17
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