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• W2118323422 abstract "Abstract Background Insulin resistance and obesity are strongly associated with systemic cardiovascular diseases. Recent reports have also suggested a link between insulin resistance with pulmonary arterial hypertension. The aim of this study was to analyze pulmonary vascular function in the insulin resistant obese Zucker rat. Methods Large and small pulmonary arteries from obese Zucker rat and their lean counterparts were mounted for isometric tension recording. mRNA and protein expression was measured by RT-PCR or Western blot, respectively. K V currents were recorded in isolated pulmonary artery smooth muscle cells using the patch clamp technique. Results Right ventricular wall thickness was similar in obese and lean Zucker rats. Lung BMPR2, K V 1.5 and 5-HT 2A receptor mRNA and protein expression and K V current density were also similar in the two rat strains. In conductance and resistance pulmonary arteries, the similar relaxant responses to acetylcholine and nitroprusside and unchanged lung eNOS expression revealed a preserved endothelial function. However, in resistance (but not in conductance) pulmonary arteries from obese rats a reduced response to several vasoconstrictor agents (hypoxia, phenylephrine and 5-HT) was observed. The hyporesponsiveness to vasoconstrictors was reversed by L-NAME and prevented by the iNOS inhibitor 1400W. Conclusions In contrast to rat models of type 1 diabetes or other mice models of insulin resistance, the obese Zucker rats did not show any of the characteristic features of pulmonary hypertension but rather a reduced vasoconstrictor response which could be prevented by inhibition of iNOS." @default.
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• W2118323422 date "2011-12-01" @default.
• W2118323422 modified "2023-10-18" @default.
• W2118323422 title "Pulmonary arterial dysfunction in insulin resistant obese Zucker rats" @default.
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• W2118323422 doi "https://doi.org/10.1186/1465-9921-12-51" @default.
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