Sarcolemmal activities of Na+-Ca2+ exchange and N+-K+ ATPase as well protein content and mRNA levels of N+-K+ ATPase in control and MI animals with or without ENP and LOS treatments for 4 weeks starting at 3 weeks after induction of MI

ParametersControlMIMI + ENPMI + LOS
A. SL activities
Na+-Ca2+ exchange activity (nmol Ca2+ mg/2s)8.2 ± 0.513.8 ± 0.26*7.4 ± 0.457.0 ± 0.21
Na+-K+-ATPase activity (μmol Pi/mg per h)22.1 ± 0.8212.9 ± 0.64*18.3 ± 0.5918.6 ± 0.84
B. Na+-K+-ATPase isoform protein content (% of control)
α210079.6 ± 3.4*89.9 ± 1.692.9 ± 2.5
α3100134.0 ± 5.2*114.7 ± 4.2113.6 ± 5.5
β210073.6 ± 3.1*98.6 ± 8.599.2 ± 8.5
β310066.8 ± 1.6*81.1 ± 4.590.3 ± 6.7
C. Na+-K+-ATPase isoform mRNA level (% of control)
α1100107.5 ± 2.5110.2 ± 4.8112.2 ± 4.5
α210072.9 ± 2.1*86.3 ± 3.685.5 ± 4.5
α3100170.5 ± 9.5*116.2 ± 4.8115.3 ± 14.8
β1100110.7 ± 7.2120.5 ± 6.5120.2 ± 7.5

Values are mean ± SE of 6 animals in each group. Data are based on the analysis of the information in our papers Shao et al. Am J Physiol Heart Circ Physiol. 2005;288:H2637–46 [116] and Guo et al. Can J Physiol Pharmacol. 2008;86:139–47 [131]. *P < 0.05 compared with control; P < 0.05 compared with MI group