[Effects of low power laser radiation of blue, green and red ranges on free radical processes in rat blood in endotoxic shock].

This study was performed to investigate the effects of low power laser radiation in blue (441.2 nm), green (532.5 nm) and red (632.

[The role of tetrapyrrol photosensitizers in photoinduced variation of free radical characteristics of rat blood in endotoxic shock].

The main goal of the present study was to evaluate the comparative effectiveness of tetrapyrrol photosensitizers (protoporphyrine IX and chlorine e6) in red (632.8 nm) and green (532.5) spectrum bands on rat blood free radical status, using the experimental model of endotoxic shock.

[Kinetic chemiluminescence as a method for the study of free radical reactions].

The review gives concepts of analysis of kinetics of complex reactions with the participation of free-radicals. The concepts are based on the comparison of the kinetic curves of the chemiluminescent reactions in the presence of a physical enhancer coumarin C-525 with the simulated kinetic functions. This method was applied to the investigation of the mechanism of a branched-chain reaction of lipid peroxidation in biological and phospholipid membranes as well as to the effect of antioxidants and determination of their activities.

[Role of endogenous porphyrins in the effects of low-intensity laser radiation of the red region on free radical processes in the blood of rats under experimental endotoxic shock].

The role of endogenous porphyrins in the effects of laser radiation of the red region (632.8 nm) on free radical processes in the blood of rats under endotoxic shock induced by the administration of lipopolysaccharide B (25 mg/kg) has been studied. The measurements of the functional activity of polymorphonuclear leukocytes (the method of luminol-dependent chemiluminescence), the superoxide dismutase activity of blood plasma (using nitro blue tetrazolium), and the degree of lipid oxidation of erythrocyte membranes (the method of fluorescence of cis-parinaric acid) have been carried out.

[Antioxidants as aromatic amino acid oxidation products].

The accumulation of UV photolysis products of amino acids tyrosine and tryptophan, which possess an antioxidant activity, has been studied by the method of luminol-activated chemiluminescence. The amount of antioxidant products was judged by the value of the total antioxidant potential of a UV-irradiated solution, the measure of which was the distance between the peaks of the chemiluminescence curve in the system 2,2'-azo-bis(2-amidinopropane)hydrochloride + luminol in a UV-irradiated and an unirradiated samples (induction period, tau(i)). Simultaneously, the absorption and fluorescence spectra of unirradiared and UV-irradiated amino acid solutions were recorded.

[Role of endogenous porphyrins in laser therapy of experimental skin wounds].

The role of endogenous porphyrins in the effect of laser irradiation on the superoxide dismutase (SOD) activity of wound exudate and rat leukocyte activity has been studied on models of aceptic incised skin wounds. Wounds were irradiated by a He-Ne laser (632.8 nm, 1.

[Production of reactive oxygen species by monocyte-derived macrophages from the blood of healthy donors and patients with IHD].

Production of reactive oxygen species (ROS) by macrophages from blood monocytes of healthy donors (MP(N)) and patients with IHD (MP(IHD)) before, during, and after their incubation with low-density lipoprotein (LDL) isolated from the blood plasma of healthy donors (LDL(N)) and patients with a high cholesterol level (LDL(H)) was estimated by the method of luminol-dependent and stimulated by opsonized zymosan (OZ) or phorbol-12-myristate-13-acetate (PMA) chemiluminescence (CL). Intrinsic luminol-dependent, and zymosan- or PMA-stimulated chemiluminescence of MP(IHD) have exceeded the same types of chemiluminescence of MP(N) by factors of 1.4, 1.

[A study of the effect of low-intensity laser radiation of the blue, green, and red spectral regions on the healing of experimental skin wounds in rats].

The effect of low-intensity laser radiation of the blue (441.2 nm), green (532 nm), and red (632.8 nm) spectral regions on the healing of experimental skin wounds in rats has been studied.

[Lucigenin-enhanced chemiluminescence of the animal tissues].

Lucigenin-enhanced chemiluminescence (LcCL) allows one to investigate the reactions of superoxide anion radical (*O2-) generated by mitochondria and is applied to study the superoxide production in enzymatic and membrane systems by isolated mitochondria and cells, and in whole organs. The application of lucigenin-enhanced chemiluminescence to estimate the respiration of human tissues involves the use of small tissue pieces, which can be obtained, for instance, by biopsia; however, no systematic investigations have been performed on these objects. In the present paper, a comparative study of lucigenin-enhanced chemiluminescence of tissues isolated from different organs of the rat was carried out to elucidate its dependence on the extent of tissue defragmentation, storage time, and access for oxygen.

[A comparative spin trapping study of hypobromous and hypochlorous acids interaction with tert-butyl hydroperoxide].

We have demonstrated that hypochlorite (HOCI/OCl-) and hypobromite (HOBr/OBr-) can react with tert-butyl hydroperoxide with close rate constants (k(HOCl) = 10,8 M(-1) x s(1); k(HOBr) = 8,9 M(-1) x (s(-1)). By means of the spin trap 4-pyridyl-1-oxide-N-tert-butyl nitron we have found that both reactions proceed through decomposition of tert-butyl hydroperoxide and generation of tert-butyl peroxyl (OOC(CH3)3) and tert-butoxyl (OC(CH3)3) radicals, the ratio of their the concentrations being dependent on the concentration of tert-butyl hydroperoxide. Thus, hypobromite, similar to hypochlorite, is a precursor of free radicals produced in the reaction with organic hydroperoxides.

[Comparison of the effects of laser and light-emitting diodes on lipid peroxidation in rat wound exudate].

The effect of laser and light-emitting diode radiation on lipid peroxidation in rat wound exudate was studied with the aim to compare the efficiency of coherent laser and incoherent light-emitting diode radiations. A model of aseptic wound in rat suggested by L.I.

[A comparison of the effects of laser and light-emitting diodes on superoxide dismutase activity and nitric oxide production in rat wound fluid].

The action of laser and light-emitting diode radiation in the visible region on the content of reactive nitrogen species and activity of superoxide dismutase in rat wound fluid was studied, and efficiency of action of coherent laser and incoherent light emitting diode radiations in the red region of the spectrum on the parameters under study was compared. A model of incised aseptic wounds in rats proposed by L.I.

[A comparative study of the effects of laser and light-emitting diode irradiation on the wound healing and functional activity of wound exudate leukocytes].

The effects of coherent He-Ne laser and non-coherent light-emitting diode radiation on rat skin wound healing and functional activity of wound excudate leukocytes were compared. A comparative pathomorphological analysis showed that the He-Ne laser and light-emitting diode irradiation stimulated the transition of the inflammatory phase of the wound healing into the reparative (proliferative) and scarring phases sequentially. It was also detected that the functional activity of leucocytes changed in a dose-dependent manner.

[The role of lipid peroxidation products in the effect of He-Ne laser on human blood leukocytes].

The role of lipid peroxidation products formed in membranes of human blood leukocytes after irradiation with He-Ne laser was studied. It was found that low-intensity laser irradiation (0.3-1.

[The role of blood plasma porphyrins in the effects of He-Ne-laser on human leukocytes].

The He-Ne-laser induced effects in human blood leukocytes in the presence of autologic plasma were investigated. Experiments were performed in two ways: (1) He-Ne-laser irradiation of cells in the presence of autologic plasma or (2) laser irradiation and subsequent addition of autologic plasma to the cell suspension. The concentration dependencies of plasma additions were evaluated.

[The interaction of hypochlorite with fatty acid hydroperoxides results in the generation of free radicals].

The interaction of hypochlorite with linoleic acid hydroperoxides was studied by the coumarin C-525-enhanced chemiluminescence and ESR spin trapping techniques. Linoleic acid hydroperoxide was obtained in the reaction of lipoxygenase and linoleic acid. Alpha-(4-pyridyl-1-oxyl)-N-tert Butylnitron was used as a spin trap.

[Molecular and cellular mechanisms of the low intensity laser radiation effect].

The main aspects of the free radical conception of the molecular and cellular mechanisms of the stimulating action of low-intensity radiation in the red region of the spectrum were considered. These are: (1) Primary acceptors of incident radiation are endogenous porphyrins, which may act as photosensitizers giving initiator-radicals for secondary free radical reactions. (2) Target cells for light irradiation during quantum therapy may be blood leukocytes, fibroblasts, keratinocytes, endotheliocytes, etc.

[Successes in medical biophysics (on the 40th anniversary of the Medico-biological faculty of the Russian State Medical University)].

On the occasion of the 40-year anniversary of the Medicobiological Faculty of the Russian State Medical University, the research activity of the biophysics department was summed up. The main result is the creation of medical biophysics as part of the medicobiological science. Scientific investigations of the biophysics department are reviewed.

[Effect of low intensity laser light in the red range on macrophage superoxide dismutase activity].

The effect of lipopolysaccharides (LPS) and low-power laser radiation on nitric oxide (NO) production and the activity of superoxide dismutase (SOD) in rat peritoneal exudate macrophages was investigated. It was found that LPS increased NO production and SOD activity in macrophages in a concentration-dependent manner. The maximal activity of SOD was more than 100 times greater than in the control and was achieved at an LPS concentration of less than 10 ng/ml.

[Interaction of tert-butyl hydroperoxide with hypochlorite induces peroxyl radicals. A chemiluminescence study].

The interaction of hypochlorite (HOCl/OCl-) with tert-butyl hydroperoxide ((CH3)3COOH) was investigated by chemiluminescence. It was shown that the addition of HOCl/OCl- to (CH3)3COOH induces a fast chemiluminescent flash. The intensity of this flash increases with the increase in both HOCl/OCl- and (CH3)3COOH concentration.

[Antioxidant properties of 3-oxypyridine analogues: mexidol, emoxipin, proxipin].

Using three chemiluminescent model systems of oxidation (suspension of phospholipid liposomes, a geous solution of haemoglobin-hydrogen peroxide-luminol and a geous solution 2,2'-azo-bis-(2-methylpropionamidine)dihydrochloride-luminol) the antioxidant activity and mechanism of antioxidant action of three 3-oxypyridine analogues: (mexidol, emoxipin and proxipin) were studied. These compounds were shown: a) to interact with catalitically active two valency iron ions (Fe2+), that causes elimination of ions from the model system; b) to scavenge reactive oxygen species and/or luminol radicals produced in the model systems. Their activity reduced in the following order: mexidol > emoxipin > proxipin.

[Peroxide chemiluminescence of blood plasma in assessment of free radical homeostasis in patients with renal diseases].

Peroxide chemiluminescence of blood plasma (PL) obtained at selective catheterization of the vessels (SCV) was measured in 40 patients with different renal diseases. PL was found to vary in different parts of the vascular bed, in veins being higher than in arteries. Combination of SCV with following PL measurement in blood samples is an additional indicator of the patients' free radical status and method of topical diagnosis of different renal diseases and those of other organs.

[Photochemiluminescent study of the antioxidant activity in biological systems. Mathematical modeling].

The mathematical modeling of the kinetics of riboflavin photo-chemiluminescence (PCL) in the presence of antioxidants, superoxide dismutase and ascorbic acid, has been performed. A specially developed computer program "Kinetic Analyzer" was used for the modeling. The PCL intensity of was taken as directly proportional to the superoxide concentration, because lucigenin had been added to the system.

[Inhibitory effects of serotonin and sodium ascorbate on the oxidative aggregation of lipoproteins].

Milk lipoproteins (MLPs) are structurally and biochemically similar to blood lipoproteins, which allow the former to be used as model objects for studying the properties of the latter. The results of turbidimetric measurements showed a change in the light scattering from MLP suspensions upon contact with Fe3+ ions in the free from or in chelate complexes with o-phenanthroline and EDTA. No such effect was observed for Fe2+ ions.

[Nitric oxide, hemoglobin and laser irradiation].

The paper deals with the present views of some chemical properties and biological effects of nitric oxide (NO) and chiefly its formation and primary conversions. The interaction of NO with superoxide radical is shown to one of the most important reactions of the former, which gives rise to peroxynitrite whose breakdown yields a hydroxy radical. Emphasis is laid on the substances that are a temporary depot or a possible transport form of NO, such as nitrosothiols and nitrosyl complexes of non-hemic iron.