BACKGROUND: Left ventricular assist device (LVAD) implantation in patients with end-stage heart failure results in impressive hemodynamic improvement. The effects on myocardial apoptosis and its mediators are unknown. METHODS: Myocardial biopsies from 17 patients at the time of LVAD implantation and after explantation, at the time of heart transplantation (HTx), were examined by terminal deoxynucleotidyltransferase-mediated dUTP nick-end labeling (TUNEL) reaction and with antibodies against Fas ligand (FasL), Fas, tumor necrosis factor (TNF)-alpha receptor 1 (TNF-R1), TNF-alpha receptor 2 (TNF-R2), TNF-alpha, TNF-alpha-converting enzyme (TACE), poly(ADP-ribose) polymerase (PARP), poly(ADP-ribose) (PAR), caspase-3 and FLICE inhibitory protein (FLIP). RESULTS: Apoptosis incidence was low: 0.8% (range 0% to 3%) positive cardiomyocytes nuclei before support, and 0.1% (range 0% to 0.6%) after support (p < 0.01). This was accompanied by low expression of caspase-3 and high expression of the DNA repair enzyme, PARP. Its product, PAR, increased after support. Mediators and receptors inducing apoptosis as well as FLIP were widely present before and after support. CONCLUSIONS: Despite the abundant presence of mediators and receptors inducing apoptosis, the incidence of apoptosis itself was low before and after mechanical support. The abundant expression of FLIP may suggest an important role for this protein in the inhibition of cardiomyocyte death.
BACKGROUND: Left ventricular assist device (LVAD) implantation in patients with end-stage heart failure results in impressive hemodynamic improvement. The effects on myocardial apoptosis and its mediators are unknown. METHODS: Myocardial biopsies from 17 patients at the time of LVAD implantation and after explantation, at the time of heart transplantation (HTx), were examined by terminal deoxynucleotidyltransferase-mediated dUTP nick-end labeling (TUNEL) reaction and with antibodies against Fas ligand (FasL), Fas, tumor necrosis factor (TNF)-alpha receptor 1 (TNF-R1), TNF-alpha receptor 2 (TNF-R2), TNF-alpha, TNF-alpha-converting enzyme (TACE), poly(ADP-ribose) polymerase (PARP), poly(ADP-ribose) (PAR), caspase-3 and FLICE inhibitory protein (FLIP). RESULTS: Apoptosis incidence was low: 0.8% (range 0% to 3%) positive cardiomyocytes nuclei before support, and 0.1% (range 0% to 0.6%) after support (p < 0.01). This was accompanied by low expression of caspase-3 and high expression of the DNA repair enzyme, PARP. Its product, PAR, increased after support. Mediators and receptors inducing apoptosis as well as FLIP were widely present before and after support. CONCLUSIONS: Despite the abundant presence of mediators and receptors inducing apoptosis, the incidence of apoptosis itself was low before and after mechanical support. The abundant expression of FLIP may suggest an important role for this protein in the inhibition of cardiomyocyte death.
Authors: Stanley M Walls; Anthony Cammarato; Dale A Chatfield; Karen Ocorr; Greg L Harris; Rolf Bodmer Journal: Cell Rep Date: 2018-03-06 Impact factor: 9.423
Authors: Henriette Brinks; Marie-Noelle Giraud; Adrian Segiser; Celine Ferrié; Sarah Longnus; Nina D Ullrich; Walter J Koch; Patrick Most; Thierry P Carrel; Hendrik T Tevaearai Journal: J Heart Lung Transplant Date: 2013-10-04 Impact factor: 10.247
Authors: Sjoukje I Lok; Nicolaas de Jonge; Joyce van Kuik; Ankie J P van Geffen; Manon M H Huibers; Petra van der Weide; Erica Siera; Bjorn Winkens; Pieter A Doevendans; Roel A de Weger; Paula A da Costa Martins Journal: PLoS One Date: 2015-10-02 Impact factor: 3.240
Authors: Tamás Bárány; Andrea Simon; Gergő Szabó; Rita Benkő; Zsuzsanna Mezei; Levente Molnár; Dávid Becker; Béla Merkely; Endre Zima; Eszter M Horváth Journal: Oxid Med Cell Longev Date: 2017-11-09 Impact factor: 6.543