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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. 2010; 56(4): 66-75


EXPRESSION OF PROTEASOME SUBUNITS PSMB5 AND PSMB9 MRNA IN HIPPOCAMPAL NEURONS: LINK WITH APOPTOSIS AND NECROSIS

Y.V. Lebed, V.E. Dosenko, G.G. Skibo

    O.O. Bogomoletz Institute of Physiology National Academy of Sciences of Ukraine, Kyiv


Abstract

There is a huge body of evidence showing that long-termed diabetes mellitus is followed with hippocampal dysfunction. The goal of this work was to investigate the expression of proteasome subunits PSMB5 and PSMB9 mRNA in CA1, CA2 and CA3 areas of hippocampus in parallel with pro­cesses of cell death (apoptosis and necrosis) in development dynamics of streptozotocine-induced diabetes. We have stud­ied hippocampal neurons using chromatine dye Hoechst-33342 and immunohistochemical detection of apoptotic cell death marker caspase-3. At day 3 and 7 after injection of streptozotocine we have performed visualization of caspase-3- immunopositive neurons showing signs of neurodegeneration in hippocampal sections using confocal microscope Olympus FV1000. The rate of proteasome subunits PSMB5 and PSMB9 mRNA expression was determined with RT-PCR. The results indicated elevation of PSMB9 mRNA content (from 4,807 ± 0,392 arbU up to 20,023 ± 4,949 arbU on day 3 and up to 20,253 ± 5,141 arbU on day 7). A maximal number of cells with signs of chromatin condensation was observed at day 3 and day 7 in CA2 and CA3 area (11,51% and 12,49% respectively). That indicates an intensification of proapoptotic processes. Summarizing the results presented above we can conclude that during the first week of diabetes mellitus devel­opment, hippocampal cells undergo the process of impairment and degeneration.

Keywords: type 1 diabetes mellitus, hippocampus, neuronal injury, proteasome.

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