title: Myocardial fibrosis blunts nitric oxide synthase-related preload reserve in human dilated cardiomyopathy.
abstract: The purpose of the study was to investigate interactions between myocardial nitric oxide synthase (NOS) and myocardial fibrosis, both of which determine left ventricular (LV) preload reserve in patients with nonischemic dilated cardiomyopathy (DCM). In previous animal experiments, chronic inhibition of NOS induced myocardial fibrosis and limited LV preload reserve. Twenty-eight DCM patients underwent LV catheterization, balloon caval occlusions (BCO; n = 8), intracoronary substance P infusion (n = 8), and procurement of LV endomyocardial biopsies for determinations of collagen volume fraction (CVF), of gene expression of NOS2, NOS3, heme oxygenase (HO)-1, and TNF-alpha, and of NOS2 protein. CVF was unrelated to the intensity of NOS2, NOS3, HO-1, or TNF-alpha gene expression or of NOS2 protein expression. Preload recruitable LV stroke work (PR-LVSW) correlated directly with NOS2 gene expression (P = 0.001) and inversely with CVF (P = 0.04). High CVF (>10%) reduced baseline LVSW and PR-LVSW at each level of NOS2 gene expression. In DCM, myocardial fibrosis is unrelated to the intensity of myocardial gene expression of NOS, antioxidative enzymes (HO-1), or cytokines (TNF-alpha) and blunts NOS2-related recruitment of LV preload reserve.
authors.affiliation: VU-University Medical Center and Institute for Cardiovascular Research-VU, Vrije Universiteit, 1081 HV Amsterdam, The Netherlands. jgf.bronzwaer@vumc.nl
authors.forename: Jean G F
authors.initials: JG
authors.lastname: Bronzwaer
authors.forename: Christophe
authors.initials: C
authors.lastname: Heymes
authors.forename: Cees A
authors.initials: CA
authors.lastname: Visser
authors.forename: Walter J
authors.initials: WJ
authors.lastname: Paulus
mesh_terms: D000328:Adult; D000368:Aged; D002311:Cardiomyopathy, Dilated / Q000503:physiopathology*; D004548:Elasticity; D005260:Female; D005355:Fibrosis; D006801:Humans; D008297:Male; D008875:Middle Aged; D009206:Myocardium / Q000473:pathology*; D019001:Nitric Oxide Synthase / Q000378:metabolism*; D016277:Ventricular Function, Left
chemical_list: D019001:Nitric Oxide Synthase