title: Deletion of CD73 in mice leads to aortic valve dysfunction.
abstract: Aortic stenosis is known to involve inflammation and thrombosis. Changes in activity of extracellular enzyme - ecto-5'-nucleotidase (referred also as CD73) can alter inflammatory and thrombotic responses. This study aimed to evaluate the effect of CD73 deletion in mice on development of aortic valve dysfunction and to compare it to the effect of high-fat diet. Four groups of mice (normal-diet Wild Type (WT), high-fat diet WT, normal diet CD73-/-, high-fat diet CD73-/-) were maintained for 15weeks followed by echocardiographic analysis of aortic valve function, measurement of aortic surface activities of nucleotide catabolism enzymes as well as alkaline phosphatase activity, mineral composition and histology of aortic valve leaflets. CD73-/- knock out led to an increase in peak aortic flow (1.06±0.26m/s) compared to WT (0.79±0.26m/s) indicating obstruction. Highest values of peak aortic flow (1.26±0.31m/s) were observed in high-fat diet CD73-/- mice. Histological analysis showed morphological changes in CD73-/- including thickening and accumulation of dark deposits, proved to be melanin. Concentrations of Ca2+, Mg2+and PO43-in valve leaflets were elevated in CD73-/- mice. Alkaline phosphatase (ALP) activity was enhanced after ATP treatment and reduced after adenosine treatment in aortas incubated in osteogenic medium. AMP hydrolysis in CD73-/- was below 10% of WT. Activity of ecto-adenosine deaminase (eADA), responsible for adenosine deamination, in the CD73-/- was 40% lower when compared to WT. Deletion of CD73 in mice leads to aortic valve dysfunction similar to that induced by high-fat diet suggesting important role of this surface protein in maintaining heart valve integrity.
authors.affiliation: Department of Biochemistry, Medical University of Gdansk, Poland.
authors.forename: P
authors.initials: P
authors.lastname: Zukowska
authors.affiliation: Department of Biochemistry, Medical University of Gdansk, Poland.
authors.forename: B
authors.initials: B
authors.lastname: Kutryb-Zajac
authors.affiliation: Jagiellonian Center for Experimental Therapeutics, Jagiellonian University, Krakow, Poland.
authors.forename: A
authors.initials: A
authors.lastname: Jasztal
authors.affiliation: Department of Biochemistry, Medical University of Gdansk, Poland.
authors.forename: M
authors.initials: M
authors.lastname: Toczek
authors.affiliation: Department of Biochemistry, Medical University of Gdansk, Poland.
authors.forename: M
authors.initials: M
authors.lastname: Zabielska
authors.affiliation: Department of Biochemistry, Medical University of Gdansk, Poland.
authors.forename: T
authors.initials: T
authors.lastname: Borkowski
authors.affiliation: Department of Surgery, Division of Cardiothoracic Surgery, University of Arizona, College of Medicine, Tuscon, United States.
authors.forename: Z
authors.initials: Z
authors.lastname: Khalpey
authors.affiliation: Department of Biochemistry, Medical University of Gdansk, Poland.
authors.forename: R T
authors.initials: RT
authors.lastname: Smolenski
authors.affiliation: Department of Biochemistry, Medical University of Gdansk, Poland. Electronic address: eslom@gumed.edu.pl.
authors.forename: E M
authors.initials: EM
authors.lastname: Slominska
mesh_terms: D015720:5'-Nucleotidase / Q000172:deficiency*; D000818:Animals; D001011:Aorta / Q000378:metabolism / Q000473:pathology / Q000503:physiopathology; D001021:Aortic Valve / Q000378:metabolism / Q000473:pathology / Q000503:physiopathology; D004041:Dietary Fats / Q000009:adverse effects / Q000494:pharmacology; D017353:Gene Deletion; D006349:Heart Valve Diseases / Q000235:genetics / Q000378:metabolism / Q000473:pathology / Q000503:physiopathology; D051379:Mice; D018345:Mice, Knockout
chemical_list: D004041:Dietary Fats; D015720:5'-Nucleotidase
keywords: Adenosine; Aortic stenosis; CD73 knock-out mice; Ecto-5′-nucleotidase; Inflammation