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  • Title: Vasospasm following subarachnoid hemorrhage: evidence against functional upregulation of Rho kinase constrictor pathway.
    Author: Yoon S, Sherman JD, Zuccarello M, Rapoport RM.
    Journal: Neurol Res; 2002 Jun; 24(4):392-4. PubMed ID: 12069288.
    Abstract:
    This study tested the hypothesis that vasospasm due to subarachnoid hemorrhage involves the functional upregulation of Rho kinase. Spasm of the rabbit basilar artery was achieved using a double hemorrhage model, which we previously demonstrated was endothelin-1 dependent. In situ effects of agents were determined by direct measurement of vessel diameter following their suffusion in a cranial window. Y-27632, a Rho kinase inhibitor, relaxed the spasm. However, relaxations to Y-27632 were not significantly greater in endothelin-1 constricted spastic vessels initially relaxed with the endothelin converting enzyme inhibitor, phosphoramidon, as compared to endothelin-1 constricted control vessels. These results suggest that, at least in the rabbit double subarachnoid hemorrhage model, vasospasm does not involve the functional upregulation of Rho kinase.
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