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ISSN 2522-9028 (Print)
ISSN 2522-9036 (Online)
DOI: https://doi.org/10.15407/fz

Fiziologichnyi Zhurnal

is a scientific journal issued by the

Bogomoletz Institute of Physiology
National Academy of Sciences of Ukraine

Editor-in-chief: V.F. Sagach

The journal was founded in 1955 as
1955 – 1977 "Fiziolohichnyi zhurnal" (ISSN 0015 – 3311)
1978 – 1993 "Fiziologicheskii zhurnal" (ISSN 0201 – 8489)
1994 – 2016 "Fiziolohichnyi zhurnal" (ISSN 0201 – 8489)
2017 – "Fiziolohichnyi zhurnal" (ISSN 2522-9028)

Fiziol. Zh. 2006; 52(3): 15-24

Proteasome inhibitors eliminate protective effect of postconditioning in cultured neonatalcardiomyocytes

V.E. Dosenko, V.S.Nagibin, L.V.Tumanovskaya, V.Yu. Zagoriy, A.A. Moibenko, J. Vaage

    Department of Experimental Cardiology, BogomoletzInstitute of Physiology, Kyiv, Ukraine;Department of Surgery and Institute of Experimental MedicalResearch, Ulleval University Hospital, Oslo, Norway



Abstract

A role of proteasomal proteolysis in the pathogenesis of ischemia-reperfusion is being actively studied. To evaluate the participation of the proteasome in postconditioning phenomenon, we used primary culture of neonatal cardio- myocytes. 30 minutes of anoxia followed by 60 minutes of reoxygenation was undergone. Postconditioning was modeled by 3 cycles of 1-minute reoxygenation followed by 1-minute anoxia, respectively. Clasto-lactacystin b-lactone, a specific proteasome inhibitor, in the dose that does not cause cell death (2.5 mМ) was added to the culture medium just before the cycles of postconditioning. Percentages of living, necrotic, and apoptotic cells were determined by staining with bisBenzimide and propidium iodide. Autophagy was demonstrated by staining vacuolar structures with monodansyl cadaverine. Proteasomal activity was determined by cleavage intensity of specific fluorogenic substrates. Trypsin-like, chymotrypsin- like and peptidyl-glutamyl peptide-hydrolyzing (PGPH) activities were decreased after anoxia. Reoxygenation led to an increase in trypsin-like and chymotrypsin-like activities comparing to anoxia, but these parameters never reached the control levels. PGPH activity was restored up to the initial level. Postconditioning increased numbers of living cells and decreased that of necrotic, apoptotic and autophagic cells. Paradoxically, it was established, that proteasome inhibitors prevented the necrotic and apoptotic cell death of cardiomyocytes in anoxia-reoxygenation, but in the same concentration abolished the effects of postconditioning. The data obtained permit to suppose that proteasome inhibitors can be used for pharmacological postconditioning.

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