The Korean Journal of Physiology and Pharmacology

The Korean Society of Pharmacology (대한약리학회)
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Functional Expression of P2Y Receptors in WERI-Rb1 Retinoblastoma Cells

  • Kim, Na-Hyun (Department of Basic Nursing Science and Institute for Nursing Science, Keimyung University) ;
  • Park, Kyu-Sang (Department of Physiology, Yonsei University Wonju College of Medicine) ;
  • Sohn, Joon-Hyung (Department of Biochemistry, Yonsei University Wonju College of Medicine) ;
  • Yeh, Byung-Il (Department of Biochemistry, Yonsei University Wonju College of Medicine) ;
  • Ko, Chang-Mann (Department of Pharmacology, Yonsei University Wonju College of Medicine) ;
  • Kong, In-Deok (Department of Physiology, Yonsei University Wonju College of Medicine)
  • Received : 2011.02.11
  • Accepted : 2011.02.18
  • Published : 2011.02.28
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Abstract

P2Y receptors are metabotropic G-protein-coupled receptors, which are involved in many important biologic functions in the central nervous system including retina. Subtypes of P2Y receptors in retinal tissue vary according to the species and the cell types. We examined the molecular and pharmacologic profiles of P2Y purinoceptors in retinoblastoma cell, which has not been identified yet. To achieve this goal, we used $Ca^{2+}$ imaging technique and western blot analysis in WERI-Rb-1 cell, a human retinoblastoma cell line. ATP ($10\;{\mu}M$) elicited strong but transient $[Ca^{2+}]_i$ increase in a concentration dependent manner from more than 80% of the WERI-Rb-1 cells (n=46). Orders of potency of P2Y agonists in evoking $[Ca^{2+}]_i$ transients were 2MeS-ATP>ATP>>UTP=${\alpha}{\beta}$-MeATP, which was compatible with the subclass of $P2Y_1$ receptor. The $[Ca^{2+}]_i$ transients evoked by applications of 2MeS-ATP and/or ATP were also profoundly suppressed in the presence of $P2Y_1$ selective blocker (MRS 2179; $30\;{\mu}M$). $P2Y_1$ receptor expression in WERI-Rb-1 cells was also identified by using western blot. Taken together, $P2Y_1$ receptor is mainly expressed in a retinoblastoma cell, which elicits $Ca^{2+}$ release from internal $Ca^{2+}$ storage sites via the phospholipase C-mediated pathway. $P2Y_1$ receptor activation in retinoblastoma cell could be a useful model to investigate the role of purinergic $[Ca^{2+}]_i$ signaling in neural tissue as well as to find a novel therapeutic target to this lethal cancer.

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