Intervening with the Nitric Oxide Pathway to Alleviate Pulmonary Hypertension in Pulmonary Vein Stenosis

被引:9
作者
van Duin, Richard W. B. [1 ,2 ]
Stam, Kelly [1 ]
Uitterdijk, Andre [1 ]
Bartelds, Beatrijs [3 ]
Danser, A. H. Jan [4 ]
Reiss, Irwin K. M. [2 ]
Duncker, Dirk J. [1 ]
Merkus, Daphne [1 ,5 ]
机构
[1] Erasmus MC, Thoraxctr, Dept Cardiol, Div Expt Cardiol, NL-3015 GD Rotterdam, Netherlands
[2] Erasmus MC Sophia Childrens Hosp, Dept Pediat Neonatol, NL-3015 GD Rotterdam, Netherlands
[3] Erasmus MC Sophia Childrens Hosp, Dept Paediat, Div Paediat Cardiol, NL-3015 GD Rotterdam, Netherlands
[4] Erasmus MC, Dept Pharmacol, NL-3015 GD Rotterdam, Netherlands
[5] Ludwig Maximilians Univ Munchen, Univ Hosp, Walter Brendel Ctr Expt Med, D-80799 Munich, Germany
关键词
pulmonary hypertension; nitric oxide; exercise; pulmonary vascular resistance; HEART-FAILURE; EXERCISING SWINE; EPIDEMIOLOGY; GUIDELINES; RESISTANCE; DIAGNOSIS; INFANTS;
D O I
10.3390/jcm8081204
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Pulmonary hypertension (PH) as a result of pulmonary vein stenosis (PVS) is extremely difficult to treat. The ideal therapy should not target the high-pressure/low-flow (HP/LF) vasculature that drains into stenotic veins, but only the high-pressure/high-flow (HP/HF) vasculature draining into unaffected pulmonary veins, reducing vascular resistance and pressure without risk of pulmonary oedema. We aimed to assess the activity of the nitric oxide (NO) pathway in PVS during the development of PH, and investigate whether interventions in the NO pathway differentially affect vasodilation in the HP/HF vs. HP/LF territories. Swine underwent pulmonary vein banding (PVB; n = 7) or sham surgery (n = 6) and were chronically instrumented to assess progression of PH. Pulmonary sensitivity to exogenous NO (sodium nitroprusside, SNP) and the contribution of endogenous NO were assessed bi-weekly. The pulmonary vasodilator response to phosphodiesterase-5 (PDE5) inhibition was assessed 12 weeks after PVB or sham surgery. After sacrifice, 12 weeks post-surgery, interventions in the NO pathway on pulmonary small arteries isolated from HP/LF and HP/HF territories were further investigated. There were no differences in the in vivo pulmonary vasodilator response to SNP and the pulmonary vasoconstrictor response to endothelial nitric oxide synthase (eNOS) inhibition up to 8 weeks after PVB as compared to the sham group. However, at 10 and 12 weeks post-PVB, the in vivo pulmonary vasodilation in response to SNP was larger in the PVB group. Similarly, the vasoconstriction to eNOS inhibition was larger in the PVB group, particularly during exercise, while pulmonary vasodilation in response to PDE5 inhibition was larger in the PVB group both at rest and during exercise. In isolated pulmonary small arteries, sensitivity to NO donor SNP was similar in PVB vs. sham groups irrespective of HP/LF and HP/HF, while sensitivity to the PDE5 inhibitor sildenafil was lower in PVB HP/HF and sensitivity to bradykinin was lower in PVB HP/LF. In conclusion, both NO availability and sensitivity were increased in the PVB group. The increased nitric oxide sensitivity was not the result of a decreased PDE5 activity, as PDE5 activity was even increased. Some vasodilators differentially effect HP/HF vs. HP/LF vasculature.
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页数:16
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