TY - JOUR A1 - , T1 - Localization of the apoptosis repressor ARC and anti-apoptotic factor FLIP in endomyocardial biopsies of cardiomyopathy patients JO - Eur. J. Anat. SN - 1136-4890 Y1 - 2002 VL - 6 SP - 161 EP - 165 UR - http://www.eurjanat.com/web/paper.php?id=02030161 KW - ARC protein KW - caspase 8 KW - DNA KW - FLICE inhibitory protein KW - repressor protein KW - unclassified drug KW - apoptosis KW - article KW - cardiomyopathy KW - enzyme localization KW - heart muscle biopsy KW - heart muscle contractility KW - human KW - human tissue KW - immunohistochemistry KW - protein analysis KW - protein expression N2 - Endomyocardial biopsies from patients with dilated cardiomyopathy were obtained by cardiac catheterization. Tissue samples were embedded in epoxy resin and sectioned into serial semithin sections for immunohistochemical visualization of either the apoptosis repressor protein or the FLICE inhibitory protein. Colocalization of apoptosis repressor protein and FLICE inhibitory protein was observed in cardiac myocytes, with nuclear DNA fragmentation and myofibrillary degradation. Intact myocytes were devoid of FLICE inhibitory protein and apoptosis repressor protein staining. FLICE (Fas-associated death-domain-like IL-1-converting enzyme) inhibitory protein and apoptosis repressor protein were localized in the perinuclear cytoplasm, mainly in areas that showed myofibrillary degradation as visualized by fluorescence microscopy. FLICE inhibitory and apoptosis repressor proteins may be intracellular markers for monitoring myocardial damage in several cardiac diseases in humans. ER -