Cyanidin-3-glucoside Inhibits ATP-induced Intracellular Free Ca<sup>2+</sup> Concentration, ROS Formation and Mitochondrial Depolarization in PC12 Cells
Cyanidin-3-glucoside Inhibits ATP-induced Intracellular Free Ca<sup>2+</sup> Concentration, ROS Formation and Mitochondrial Depolarization in PC12 Cells
- Shazia Perveen Ji Seon Yang Tae Joung Ha Shin Hee Yoon
- 대한생리학회-대한약리학회
- The Korean Journal of Physiology & Pharmacology
- 제18권 제4호
- 등재여부 : KCI등재
- 2014.01
- 297 - 305 (9 pages)
Flavonoids have an ability to suppress various ion channels. We determined whether one of flavonoids, cyanidin-3-glucoside, affects adenosine 5 -triphosphate (ATP)-induced calcium signaling using digital imaging methods for intracellular free Ca<sup>2+</sup> concentration ([Ca<sup>2+</sup>]i), reactive oxygen species (ROS) and mitochondrial membrane potential in PC12 cells. Treatment with ATP (100μM) for 90 sec induced [Ca<sup>2+</sup>]i increases in PC12 cells. Pretreatment with cyanidin-3-glucoside (1μg/ml to 100μg/ml) for 30 min inhibited the ATP-induced [Ca<sup>2+</sup>]i increases in a concentration-dependent manner (IC50=15.3μg/ml). Pretreatment with cyanidin-3-glucoside (15μg/ml) for 30 min significantly inhibited the ATP-induced [Ca<sup>2+</sup>]i responses following removal of extracellular Ca<sup>2+</sup> or depletion of intracellular [Ca<sup>2+</sup>]i stores. Cyanidin-3-glucoside also significantly inhibited the relatively specific P2X2 receptor agonist 2-MeSATP-induced [Ca<sup>2+</sup>]i responses. Cyanidin-3-glucoside significantly inhibited the thapsigargin or ATP-induced store-operated calcium entry. Cyanidin-3-glucoside significantly inhibited the ATP-induced [Ca<sup>2+</sup>]i responses in the presence of nimodipine and ω-conotoxin. Cyanidin-3- glucoside also significantly inhibited KCl (50 mM)-induced [Ca<sup>2+</sup>]i increases. Cyanidin-3-glucoside significantly inhibited ATP-induced mitochondrial depolarization. The intracellular Ca<sup>2+</sup> chelator BAPTA-AM or the mitochondrial Ca<sup>2+</sup> uniporter inhibitor RU360 blocked the ATP-induced mito-chondrial depolarization in the presence of cyanidin-3-glucoside. Cyanidin-3-glucoside blocked ATP- induced formation of ROS. BAPTA-AM further decreased the formation of ROS in the presence of cyanidin-3-glucoside. All these results suggest that cyanidin-3-glucoside inhibits ATP-induced calcium signaling in PC12 cells by inhibiting multiple pathways which are the influx of extracellular Ca<sup>2+</sup> through the nimodipine and ω-conotoxin-sensitive and -insensitive pathways and the release of Ca<sup>2+</sup> from intracellular stores. In addition, cyanidin-3-glucoside inhibits ATP-induced formation of ROS by inhibiting Ca<sup>2+</sup>-induced mitochondrial depolarization.