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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. 2013; 59(6): 124-131


The expression of Akt kinase in the heart ventricles under hypoxic preconditioning and myocardial remodeling

Portnichenko AG1, Lapikova-Briginskaia TIu2, Vasilenko MI2, Portnichenko GV2, Maslov LN3, Moĭbenko AA2

  1. International Centre for Astronomical, Medical and Ecological Research, NAS of Ukraine, Kyiv, Ukraine;
  2. Bogomoletz Institute of Physiology NAS of Ukraine, Kyiv, Ukraine
  3. FGBO SRI of Cardiology, Siberian Branch of RAMS, Tomsk, Russia
DOI: https://doi.org/10.15407/fz59.06.124


Abstract

Activation of Akt-dependent mechanisms may play a significant role in the cellular response under hypoxic preconditioning and myocardial remodeling. The impact of hypoxic preconditioning, and remodeling on the expression of Akt kinase in the heart ventricles was investigated. Wistar male rats, the residents of plains or middle altitude (2100 m above sea level), were exposed to hypoxic preconditioning by "lifting" in the barochamber at the "height" of 5,600 m in 3 h. In the right and left ventricles of the heart, Akt protein expression was determined by Western blotting. It was shown, that hypoxic preconditioning causes the induction of Akt kinase in the ventricles during the period of delayed cardioprotection (1-3 days after preconditioning). Myocardial remodeling induced by chronic hypoxia in middle altitude was associated with elevated Akt expression in the myocardium, more pronounced in the left ventricle. Progression of hypoxic myocardial remodeling found in part of the animals was accompanied by a reduction of the cell hypoxic reactivity, including Akt induction in response to preconditioning. Thus, Akt kinase is involved in the mechanisms of hypoxia induced late preconditioning and myocardial remodeling in chronic hypoxia. Inhibitory regulatory mechanism was found to limit the induction of Akt in myocardium after remodeling.

Keywords: hypoxic myocardial preconditioning, hypoxicmyocardial remodeling, Akt kinase expression

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