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Alteration of Ryanodine-receptors in Cultured Rat Aortic Smooth Muscle Cells

  • Kim, Eun-Ji (Department of Physiology, College of Medicine, Konyang University) ;
  • Kim, Dong-Kwan (Department of Physiology, College of Medicine, Konyang University) ;
  • Kim, Shin-Hye (Department of Physiology, College of Medicine, Konyang University) ;
  • Lee, Kyung-Moo (Department of Physiology, College of Medicine, Konyang University) ;
  • Park, Hyung-Seo (Department of Physiology, College of Medicine, Konyang University) ;
  • Kim, Se-Hoon (Department of Physiology, College of Medicine, Konyang University)
  • 투고 : 2011.11.16
  • 심사 : 2011.11.25
  • 발행 : 2011.12.30

초록

Vascular smooth muscle cells can obtain a proliferative function in environments such as atherosclerosis in vivo or primary culture in vitro. Proliferation of vascular smooth muscle cells is accompanied by changes in ryanodine receptors (RyRs). In several studies, the cytosolic $Ca^{2+}$ response to caffeine is decreased during smooth muscle cell culture. Although caffeine is commonly used to investigate RyR function because it is difficult to measure $Ca^{2+}$ release from the sarcoplasmic reticulum (SR) directly, caffeine has additional off-target effects, including blocking inositol trisphosphate receptors and store-operated $Ca^{2+}$ entry. Using freshly dissociated rat aortic smooth muscle cells (RASMCs) and cultured RASMCs, we sought to provide direct evidence for the operation of RyRs through the $Ca^{2+}$- induced $Ca^{2+}$ -release pathway by directly measuring $Ca^{2+}$ release from SR in permeabilized cells. An additional goal was to elucidate alterations of RyRs that occurred during culture. Perfusion of permeabilized, freshly dissociated RASMCs with $Ca^{2+}$ stimulated $Ca^{2+}$ release from the SR. Caffeine and ryanodine also induced $Ca^{2+}$ release from the SR in dissociated RASMCs. In contrast, ryanodine, caffeine and $Ca^{2+}$ failed to trigger $Ca^{2+}$ release in cultured RASMCs. These results are consistent with results obtained by immunocytochemistry, which showed that RyRs were expressed in dissociated RASMCs, but not in cultured RASMCs. This study is the first to demonstrate $Ca^{2+}$ release from the SR by cytosolic $Ca^{2+}$ elevation in vascular smooth muscle cells, and also supports previous studies on the alterations of RyRs in vascular smooth muscle cells associated with culture.

키워드

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