Necrotic and autophagic cardiomyocyte cell death in culture
V.E. Dosenko, V.S. Nagibin, L.V. Tumanovskaya,A.A. Moibenko, J.VaagePOSTCONDITIONING PR
A.A. Bogomoletz Institute of Physiology National Academy ofSciences of Ukraine, Kiev
Abstract
In the paper the data concerning the possibility of the
reproduction of the postconditioning phenomena in the
cardyomicyte culture are presented. Primary cultures of
cardiomyocytes from neonatal rats underwent 30 minutes of
anoxia followed by 60 minutes of reoxygenation. Three differ-
ent models of postconditioning were used: 3 cycles of 1, 3, or
5 minutes of reoxygenation followed by 1, 3, or 5 minutes of
anoxia, respectively. The percentage of living, necrotic, and
apoptotic cells were determined by staining with Hoechst
33342 and propidium iodide. Autophagy was demonstrated
by the staining of vacuolar structures in vivo by monodansyl
cadaverine. After anoxia and reoxygenation the amount of living,
necrotic and apoptotic cells were 79±1.5, 7.8±0.9 and 13±1.5
%, respectively (in unstimulated cell culture 90±0.8, 3.3±0.3,
and 5.5±0.7, P<0.0001 for all). Postconditioning with 1 min
anoxia 3-fold increased the amount of living cells and decreased
the number of necrotic and apoptotic cells (P=0.002, P=0.02
and P=0.043 respectively). Postconditioning with cycles of 3
and 5 minutes had a gradually reduced effect compared to
cycles of 1 minute. The percentage of autophagic cells in control
cell culture was 4.3±0.3%. This number increased after anoxia-
reoxygenation to 14±0.8%, and was reduced by postconditioning
(P<0.001). The data obtained indicate that postconditioning is
one of the effective methods of cardioprotection and could ef-
fectively decrease the amount of cardiomyocytes with traits of
programmed or non-programmed cell death.
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