Systolic pressure (SP) and heart rate (HR) were determined in CTRL (normal diet) and BRD rats.
Plasma albumin, plasma
urea and urinary
urea excretion decreased in BRD rats. In this group, echocardiography and the Langendorff technique showed: (i) increased HR and
hypertension; (ii) decreased LVDP, dP/dtmax, dP/dtmin, cardiac output, ejection fraction, stroke volume and left ventricular diameter. BRD rats were less sensitive to
isoproterenol (ISO) in LVDP and dP/dtmax, with unchanged dP/dtmin; Pressure-volume relationships indicated left-oriented shifts in LVDP, SP and DP, and decreased capacitance compared to CTRL. BRD rats had higher cardiac and lung indexes, accompanied by
muscle atrophy and recent ventricular-infarcted areas, higher ventricular β1-AR content, and decreased β2-AR and α1-AR.
Propranolol treatment gave similar ISO responses in both groups, disappearance of the infarcted regions and, except for β2-AR, recovery of normal receptor expression. BRD rats had intense stimulation of plasma membrane Ca2+-
ATPase (PMCA) activity, with increased Ca2+ affinity and inhibition of the sarco(endo)plasmic reticulum Ca2+-
ATPase (SERCA). Ventricular
phospholamban increased and Na+/Ca2+ exchanger decreased. PMCA activity correlated with an increase in its PKC-mediated phosphorylation, overlying a decrease in PKA-catalyzed phosphorylation.
Propranolol normalized PKC and PKA activities with recovery of PMCA but not SERCA.
CONCLUSION: