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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. 2012; 58(5): 56-64

Continuous adaptation of rats to hypobaric hypoxia prevents stressor hyperglycemia and optimizes mitochondrial respiration under acute hypoxia

Portnichenko VI, Nosar VI, Sydorenko AM, Portnichenko AH, Man'kovs'ka IM

  1. International Centre for Astronomical, Medical and EcologicalResearch NAS of Ukraine, Ukraine
  2. O.O.Bogomoletz Institute of Physiology NAS of Ukraine, Kyiv, Ukraine
DOI: https://doi.org/10.15407/fz58.05.056


Abstract

Oxygen consumption, glucose blood level and liver mi-tochondrial respiration were investigated in male Wistar rats permanently living in middle altitude (2100 m, Elbrus region). The animals were characterized by reduced body oxygen consumption and blood glucose level, as well as by intensifed utilization of NAD-dependent substrates in mitochondrial respiratory chain with increasing indices of ADP-stimulated respiration in comparison with plains rats. As a result of adaptive rebuilding of oxidative metabolism in rats – inhabitants of midlands, the nature and severity of metabolic responses to acute hypoxia were also changed. After lifting in barochamber to a “height’ of 5600 m during 3 hours, plains rats transiently demonstrated hypometabolic and hyperglycemic reactions. A rapid adaptation of mitochondrial function occurred due to increase in the rate of FAD-dependent substrate oxidation accompanied by a decrease in the effectiveness of phosphorylation. In midland rats, by contrast, hypoglycemic reaction was developed, and further reduction of aerobic metabolism was limited. Rapid adaptation of mitochondrial function to acute hypoxia in those rats was more intense than in the plains animals. This was achieved by a signifcant increase in the rate of NAD-dependent substrate oxidation, especially lipids, and an improved effciency of mitochondrial respiration and an increased economy of oxygen utilization.

Keywords: high altitude hypoxia, acute hypoxia, hyperglycemia,hypoglycemia, hypometabolism, mitochondrial respiration,carbohydrate metabolism, lipid metabolism.

Full text: (PDF, in Ukrainian)

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