Aim To investigate the effects and explore the mechanism of Cyclovirobuxine-D(CVB-D) on expression of GRK-2 in primary culture cardiac myocyte injury induced by norepinephrine(NE).Methods The primary culture cardiac myocyte injury was reproduced by 20 μmol.L-1.The injury was assayed by the cell survivial rate and LDH activity in medium.cAMP content in the cell lysis solution was measured by ELISA,and the GRK-2 protein expression was detected by Western blot.Results NE significantly decreased the cell surviv...