Autophagic and oncotic cardiomyocytes death in anoxia -reoxygenation
Tumanovska L.V., Dosenko V.E., Nagibin V.S., Makogon N.V., Moibenko A.A.
A.A. Bogomoletz Institute of Physiology National Academy ofSciences of Ukraine, Kiev
Abstract
In experiments on isolated rat neonatal cardiomyocytes under
anoxia-reoxygenation it was established the different types of
cell death: non-programmed (oncotic) and programmed
(apoptotic and autophagic). Propidium iodide and Hoechst
33342 staining revealed that alive, necrotic and apoptotic cell
ratio after anoxia-reoxygenation was 77%, 14%, 9%
respectively (86%, 9.6% and 4.4% in control). Electron microscopy
of neonatal rat cardiomyocytes allows us to clarify
the ultrastructural peculiarities of each type of cell death.
Cytoplasm hydratation, swelling, cell membrane components
vacuolization and sarcollemmal integrity alteration were typical
for necrosis. The features of apoptosis include: cytoplasm
osmiophylia, cell organelle destruction, chromatin condensation
and nucleus fragmentation as well as blebs and apoptotic body
formation. Autophagic cell death was characterized by the
presence of large amount of different size vacuoles accompanied
by significant cytoplasm osmiophylia, chromatin
condensation or nucleus picnosis (nucleus fragmentation was
not observed in these cells) and preservation of sarcollemmal
integrity. The autophagic cardiomyocytes destruction was
proved by specific monodansylcadaverine staining of vacuolar
structures. We first showed the anoxia-reoxygenation-related
autophagic cell death of neonatal rat cardiomyocytes. These
results strongly suggest the necessity of autophagic cell death
investigation in pathogenesis of cardiovascular diseases.
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