Alteration of Ryanodine-receptors in Cultured Rat Aortic Smooth Muscle Cells
Alteration of Ryanodine-receptors in Cultured Rat Aortic Smooth Muscle Cells
- Eun Ji Kim Dong Kwan Kim Shin Hye Kim Kyung Moo Lee Hyung Seo Park Se Hoon Kim
- 대한생리학회-대한약리학회
- The Korean Journal of Physiology & Pharmacology
- 제15권 제6호
- 등재여부 : KCI등재
- 2011.01
- 431 - 436 (6 pages)
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<sup>2+</sup> 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<sup>2+</sup> release from the sarcoplasmic reticulum (SR) directly, caffeine has additional off-target effects, including blocking inositol trisphosphate receptors and store-operated Ca<sup>2+</sup> 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<sup>2+</sup>- induced Ca<sup>2+</sup>-release pathway by directly measuring Ca<sup>2+</sup> 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<sup>2+</sup> stimulated Ca<sup>2+</sup> release from the SR. Caffeine and ryanodine also induced Ca<sup>2+</sup> release from the SR in dissociated RASMCs. In contrast, ryanodine, caffeine and Ca<sup>2+</sup> failed to trigger Ca<sup>2+</sup> 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<sup>2+</sup> release from the SR by cytosolic Ca<sup>2+</sup> elevation in vascular smooth muscle cells, and also supports previous studies on the alterations of RyRs in vascular smooth muscle cells associated with culture.