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        45Ca2+ uptake study in PC12 cells

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        <center> <h3> 45Ca2+ uptake study in PC12 cells</h3> </center>

         

        1. Plate the cells on to the poly-D-Lysine-coated six well plates 2 days prior to study. 

        2. Rinse the cells with 1 ml secretion buffer (150 mM NaCl, 5mM KCl, 2mM CaCl2, 10 mM Hepes, pH 7.4) every 15 minutes for 1 hour at 37o C. 

        3. Add 45Ca2+ (2 µCi/ml) to Ca2+ -free buffer (secretion buffer without 2 mM CaCl2), and drugs to the labelled buffer at 37o C. 

        4. Incubate the cells with labelled buffer with different conditions for 1 minute at room temperature. 

        5. After 1 minute dump the solution and add 2 ml of ice cold Ca2+ -free buffer with 2 mM LaCl3 and 2 mM EGTA. 

        6. Wash the cells 6 times with ice cold Ca2+ -free buffer with LaCl3 and EGTA. 

        7. Add 1 ml of cell lysis buffer to each well. 

        8. Collect the cell lysate after 30 minutes and count in a beta-counter using 

        program for 14C. 

        9. The data are expressed as dpm/well. 

        Source of the reagents: 45Ca2+ (Dupont) (Calcium chloride in water; specific activity: 25.92 mCi/mg). 

         

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