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자료유형
학술저널
저자정보
Bai, Guang-Yi (Department of Neurosurgery, Chonbuk National University, Medical School) Yang, Tae-Ki (Department of Neurosurgery, Chonbuk National University, Medical School) Gwak, Yong-Geun (Department of Pharmacology, Chonbuk National University, Medical School) Kim, Chul-Jin (Department of Neurosurgery, Chonbuk National University, Medical School)
저널정보
대한신경외과학회 대한신경외과학회지 대한신경외과학회지 제39권 제3호
발행연도
2006.1
수록면
215 - 220 (6page)

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Objective : Tyrosine kinase inhibitors may be useful in the management of cerebral vasospasm. It has not yet been reported whether L-type $Ca^{2+}$ channels playa role in tyrosine kinase inhibitors-induced vascular relaxation of cerebral artery. This study was undertaken to clarify the role of L-type $Ca^{2+}$ channels in tyrosine kinase inhibitors-induced vascular relaxation, and to investigate the effect of tyrosine kinase inhibitors on L-type $Ca^{2+}$ channels currents in freshly isolated smooth muscle cells from rat basilar artery. Methods : The isolation of rat basilar smooth muscle cells was performed by special techniques. The whole cell currents were recorded by whole cell patch clamp technique in freshly isolated smooth muscle cells from rat basilar artery. Results : Patch clamp studies revealed a whole-cell current which resembles the L-type $Ca^{2+}$ current reported by others. The amplitude of this current was decreased by nimodipine and increased by Bay K 8644. Genistein[n=5], tyrphostin A-23[n=3]. A-25[n=6] $30{\mu}M$ reduced the amplitude of the L -type $Ca^{2+}$ channel current in whole cell mode. In contrast, diadzein $30{\mu}M$ [n=3]. inactive analogue of genistein, did not decrease the amplitude of the L-type $Ca^{2+}$ channels current. Conclusion : These results suggest that tyrosine kinase inhibitors such as genistein, tyrphostin A-23, A-25 may relax cerebral vessel through decreasing level of intracellular calcium, [$Ca^{2+}$]i, by inhibition of L-type $Ca^{2+}$ channel.

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