Neuromuscular electrical stimulation relieves pulmonary artery hypertension associated with chronic hypoxic hypercapnia / 中华物理医学与康复杂志

ABSTRACT

Objective To investigate effects of neuromuscular electrical stimulation (NMES) on pulmonary arterial hypertension induced by chronic hypoxic hypercapnia in rats.Methods Eighteen male Sprague-Dawley rats were randomly divided into a normal control group (the control group),a hypoxic hypercapnia group (the model group),and a hypoxic hypercapnia + NMES group (the NMES group),each of 6.The rats in both the model and NMES groups were placed in an isobaric cabin with an O2 concentration of 9％ to 11％ and a CO2 concentration of 5％ to 6％ for 8 hours a day for 4 weeks.After leaving the cabin,NMES was performed on the NMES group's bilateral calf muscles for 30 minutes every day.The heart was removed,and the right ventricle (RV) and the left ventricle plus the septum (LV+S) were dissected.An index of right ventricular hypertrophy was calculated as RVHI=RV/(LV+S).Any changes in the pulmonary vasculature were observed using an optical microscope.WT％ and WA％ were calculated.The expression of hypoxia-inducible factor-1α (HIF-1α),PDH-E1α and PDK1 in the lung tissue were determined using western blotting.The LDH activity and the concentration of PDH in the lung tissue homogenate were measured was measured by spectrophotometric method using the LDH assay kit and ELISA,respectively.Results Compared with the control group,the average RVHI,WT％ and WA％,the protein expression of HIF-lα and PDK1,and LDH activity had all increased significantly in the NMES group,while the average expression of PDH-1Eα had decreased significantly.Compared with the model group,significant decrease was observed in the average RVHI,WT％,WA％,protein expression of HIF-1α and PDK1,and LDH activity in the NMES group,but the average expression of PDH-1Eα increased significantly.No significant differences in PDH concentration were detected among the 3 groups.Conclusions NMES may alleviate pulmonary artery hypertension induced by chronic hypoxic hypercapnia,at least in rats.The mechanism may be attributed to inhibiting the expression of HIF-1α protein,which may inhibit the activity of PDH-E1α and LDH,then the aerobic metabolism into glycolysis,finally improving the remodeling of the pulmonary vascular structure.