Norepinephrine-induced PLC isozyme protein content in cardiomyocytes transfected with c-Fos and c-Jun siRNA. Representative blots (A) of PLC isozyme β1 (150 kD), β3 (150 kD) and δ1 (85 kD) protein content and quantified data showing PLC β1 (B), β3 (C) and δ1 (D) protein content (arbitrary densitometric units) in c-Fos and c-Jun siRNA (5 nM) transfected cardiomyocytes treated with NE (5 μM) for 24 hrs. Control cardiomyocytes were treated with 5 nM negative control siRNA as described in ‘materials and methods’ section. Values are mean ± S.E. of five experiments performed with five different cardiomyocyte preparations. *Significantly different (P < 0.05) versus control; #significantly different (P < 0.05) versus NE. CONT, control; NC, negative control; NE, norepinephrine; siRNA, small interfering RNA.