Cardiac performance, status of RAS and oxidative stress 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. Hemodynamic parameters
LVEDP (mmHg)4.0 ± 0.215.9 ± 1.3*7.5 ± 0.66.9 ± 0.5
LVSP (mmHg)133 ± 4.9128 ± 3.2131 ± 3.8127 ± 3.9
LV + dP/dt (mmHg/s)9,208 ± 10754,806 ± 745*7,690 ± 6807,544 ± 722
LV − dP/dt (mmHg/s)8,788 ± 9564,326 ± 590*7,248 ± 7027,312 ± 690
B. RAS activity parameters
Plasma ANG II (fmol/mL)8.3 ± 1.4125 ± 6.9*34 ± 3.5192 ± 9.9
Plasma ACE activity (nmol/min per mL)51 ± 3.385 ± 7.1*32 ± 2.4145 ± 7.1
LV ACE activity (nmol/min per mg protein)0.45 ± 0.030.69 ± 0.04*0.23 ± 0.020.84 ± 0.05
C. Oxidative stress levels
LV MDA (nmol/mg tissue lipids)5.9 ± 0.419.1 ± 0.8*12.7 ± 0.310.1 ± 0.4
LV conjugated dienes formation (nmol/mg tissue lipids)33 ± 1.956 ± 4.9*41 ± 3.037 ± 3.3
LV GSH (μmol/g tissue)82 ± 1.636 ± 4.1*74 ± 4.168 ± 3.7
LV GSSG (μmol/g tissue)12.4 ± 0.825.2 ± 2.6*14.2 ± 1.415.3 ± 1.6

Values are mean ± standard error (SE) of 4–6 animals in each group. ENP: enalapril (10 mg/kg per day); LOS: losartan (20 mg/kg per day); MI: myocardial infarction; RAS: renin-angiotensin system; ACE: angiotensin-converting enzyme; LVEDP: LV end diastolic pressure; LVSP: LV systolic pressure; + dP/dt: maximum rate of pressure development; -dP/dt: maximum rate of pressure decay; MDA: malondialdehyde; GSH: reduced glutathione; GSSG: oxidized glutathione. 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 Shao et al. Am J Physiol Heart Circ Physiol. 2005;288:H1674–82 [113]. *P < 0.05 compared with control; P < 0.05 compared with MI group