Myofibrillar ATPase activities, protein content and mRNA levels in control and MI animals with or without ENP and LOS for 5 weeks starting at 3 weeks after induction of MI

ParametersControlMIMI + ENPMI + LOS
A. MF activities (μmol Pi/mg per h)
Ca2+-stimulated ATPase activity10.8 ± 0.47.1 ± 0.4*8.3 ± 0.657.9 ± 0.52
Mg2+-ATPase activity3.6 ± 0.43.8 ± 0.453.2 ± 0.33.2 ± 0.3
B. Myosin heavy chain content (% of total)
Total MHC10096.2 ± 4.9100.0 ± 4.696.0 ± 9.8
α-MHC93.5 ± 2.471.0 ± 1.8*83.6 ± 1.385.4 ± 1.6
β-MHC6.5 ± 0.329.0 ± 1.5*17.6 ± 1.213.8 ± 0.4
C. Myosin heavy chain mRNA levels (Relative intensity)
α-MHC92.25 ± 0.2571.25 ± 1.25*81.90 ± 1.982.75 ± 2.5
β-MHC7.50 ± 0.2530.00 ± 1.25*19.75 ± 1.7515.62 ± 0.12

Values are mean ± SE of 7 animals in each group. MLC: myosin light chain. Data are based on the analysis of the information in Figures 1, 2 and 3 in our paper Wang et al. Biochim Biophys Acta. 2004;1690:177–84 [119]. *P < 0.05 compared with control; P < 0.05 compared with MI group