Estimation of Decellularization and Recellularization Quality of Tissue-Engineered Constructions by the Chemiluminescence Method.

It was found that the chemiluminescence intensity in native and recellularized tissues of rat muscular organs as well as in their decellularized scaffolds can serve as an express criterion that, along with ultrastructural analysis, makes it possible to perform quantitative assessment of the viability of cellular structures in biological samples of the diaphragm.

[Ontogenetic aspects of changing lysozyme activity under acute somatic pain].

OBJECTIVE: Ouraim was to study influence of acute somatic pain on lysozyme activity of rats of different age: newborn, rats after eye opening, rats at the age of a month, adult and old rats. METHODS: Lysozyme activity was checked before pain irritation and 2, 30, 60, 120, 180min afterwards using Dorofeychuk's method in our modification. Pain effect was modeling by electrical stimulation. RESULTS: activity of lysozyme was 0. 434±0. 01 units in intact newborn rats, It was higher than in adult rats - 0.260 ±0.01 units (p <0.001) and it was unchanged during the experiment. We found low lysozyme activity in rats after eye opening - 0.015±0.003 units and it was stable during the experiment. Rats at the age ofa month had diphasic reaction: lysozyme activity was 0.191±0.01 units in intact rats, it increased up to 0.378±0.01 units (p <0.001) in 2 min after painful irritation and it decreased up to 0.113±0.02 units (p <0.001) in 30 min. Lysozyme activity was 0.260±0.01 units. Single-phase reaction was determined after acute painful irritation: increase of lysozyme activity after acute somatic pain up to 0,450±0,014 units (p <0.001). Lysozyme activity was 0.246±0.02 units in blood plasma of old rats. It decreased up to 0.1701±0.01 units (p <0.01) after painful irritation and it was 0.387±0.01 (p <0.001) in the end of the experiment. CONCLUSION: Response on pain irritation has differences in different groups. The common vector of pain response was the increase of lysozyme activity in rats at the age of a month, adult rats, rats after eye opening and old rats. Reaction of increasing lysozyme activity was strongly detected in adult rats. The results demonstrate preventive lasozyme resistance to potential tissue damage or contamination.

Free radical processes in the liver of adult and old rats during stress.

We measured the content of free radical lipid peroxidation products, intensity of induced lipid peroxidation, and concentration of carbonylated proteins in the liver of adult (10-12 months) and old rats (22-25 months) subjected to 30-min immobilization. Changes in the intensity of induced lipid peroxidation in homogenates and accumulation of carbonylated proteins in subcellular liver fractions indicate that immobilization stimulates free radical generation in the liver of both adult and old rats. The intensity of this process in old rats surpassed that in adult animals.