Inventive activity of Scientific Center of Reconstructive and Restorative Surgery SB RAMS (report 1)

The article presents the review of inventive and patent work of employees of Scientific Center of Reconstructive and Restorative Surgery SB RAMS from the foundation of institute of surgery till nowadays. Main areas of researches (in the form of patents) are determined: prevention and treatment of surgical infection, methods of treatment of actual surgical pathology of neck, chest, abdomen and soft tissues and also instrumental and laboratory diagnostics of these conditions. The models of pathological processes developed in experiment and cell technologies are patented. The level of patent defense of researches is considered to be corresponding

Clinical trials in Irkutsk Scientific Center of Surgery and Traumatology: results and prospects

Clinical drug trials in Irkutsk Scientific Center of Surgery and Traumatology began in 2005. In 2013, the laboratory of clinical trials was established in the science department of clinical surgery. We analyzed the experience of Irkutsk Scientific Center of Surgery and Traumatology in international multicentre trials. Participation in international multicentre trials allows the Irkutsk Scientific Center of Surgery and Traumatology to get affiliated with the publications in first quartile scientific journals. The experience of the laboratory in clinical trials is projected into practical work of other institutes - Hospital of Irkutsk Scientific Center SB RAS and Irkutsk Regional Clinical Hospital. The important objectives of the laboratory of clinical trials are developing the protocols, performing drug clinical trials and medical device clinical trials. The laboratory carries out admission of patients for observational trial PROTOCOL. One of the fields of work of the laboratory is the prospect of clinical testing of developed clinical technologies

INVENTIVE WORK OF SCIENTIFIC CENTER OF RECONSTRUCTIVE AND RESTORATIVE SURGERY SB RAMS (REPORT 2)

The article presents the analysis of the inventive work of the Institute of Traumatology and Orthopaedics being a part of the Scientific Center of Reconstructive and Restorative Surgery SB RAMS. Main directions of patent work including hip replacement technologies, diagnostics and treatment of spine and spinal cord pathologies, methods of managing bone tissue regeneration and of using autologous tissues for osteoplasty, septic osteology, anesthetic management techniques in orthopedic surgery and also of evaluation and modulation of functional state of organism were marked. The effectiveness of patented technologies is proved in the current researches of the Center that allows to transmit them into practical health care

Differentiated approach to cell correction of acute hepatic failure at the acute toxic injury. Morphological basis of choosing the way of treatment

The article is devoted to the estimation of morphological changes in liver of experimental animals with acute hepatic failure caused by toxic injury of liver under the influence of xenotransplantation of culture of cryopreserved cells of liver and isolated cryopreserved neonatal hepatocytes. It was determined that undamaged hepatocytes with simultaneous decrease of number of vacuolated cells, preservation. of beam structure, decrease of fat insertions prevailed in the liver of animals with xenotransplantation of culture of cryopreserved cells of liver to the 6th day. At the transplantation of isolated neonatal hepatocytes number of hepatocytes with undamaged structure decreased and number of damaged hepatocytes increased. Thus, cultivated cryopreserved cells of liver are the cells of choice of correction of acute toxic liver injury

Circulating free DNA in hypertensive patients with high cardiovascular risk

Aim. To evaluate the level of circulating free nuclear DNA (nDNA) and mitochondrial DNA (mtDNA) in hypertensive patients with high cardiovascular risk.Material and methods. The study included 70 patients, of which 51 were patients with hypertension (HTN) and 19 were healthy. The study of the level of circulating free nDNA and mtDNA was carried out using quantitative polymerase chain reaction (PCR). Additionally, demographic data, comorbidities, risk factors, heredity, results of complete blood count and biochemical blood tests, electrocardiography and echocardiography were analyzed.Results. The level of nDNA in HN patients was significantly higher than in healthy patients: Me (LQ; UQ) — 227 (110; 370) copies/mL and 88 (62; 116) copies/ml, respectively (p<0,0001). In hypertensive patients with a very high cardiovascular risk, the level of nDNA and mtDNA was significantly higher compared to healthy participants: 294 (154; 489) copies/ml versus 88 (62; 116) copies/ml, p<0,0001; 56731 (42531; 129375) copies/mL versus 35156 (18325; 54956) copies/mL, p=0,015.Conclusion. The level of circulating free DNA in hypertensive patients with very high cardiovascular risk is significantly increased, and therefore this parameter can be a cardiovascular risk marker

Design of organyl phosphate-based pro-drugs: comparative analysis of the antibiotic action of alkyl protecting groups with different degree of fluorination

Background. Molecular structures combining a phosphorus-containing counterpart and non-polar radicals are employed in design of pro-drugs as structural and functional groups necessary for transportation of drugs through cellular barriers. It is assumed that the carrier itself does not exhibit biological activity. However, the “organic phosphate – alkyl radical” complex may possess its own metabolic and pharmacological properties even in the absence of a drug moiety.The aim. To study the effect of fluorinated alkyl phosphates on the growth of bacterial test cultures in an agar medium and to identify conjugated metabolic markers using UV/visible spectroscopy.Materials and methods. The effect of six organyl phosphates on the growth of five types of bacteria under aerobic conditions was evaluated by the method of wells in an agar medium. For solutions containing cell metabolites of Pseudomonas aeruginosa, the absorption spectra were recorded at 250–280 nm. The principal component analysis (PCA) was used for multivariate comparative analysis of the spectra. Results. The studied organyl phosphates bearing the ethyl and propyl radicals are potential temporary carriers of the drug moiety, since they are capable of penetrating through cellular barriers. However, the fluorinated compounds exhibit bactericidal properties, the degree of which depends on the arrangement of fluorine atoms in the radical. The most active compounds are those exhaustively halogenated at the terminal carbon atom of the ethyl radical (-СН2-СF3), while non-fluorinated organyl phosphate is the least active. UV/visible spectra of P. aeruginosa cultivation products, according to PCA data, contain patterns reflecting the metabolic effects mediated by these structural features of the radicals.Conclusion. In terms of practical application of the studied compounds, the activity of a proantibiotic based on organyl phosphate with a non-fluorinated ethyl(propyl) radical will be determined only by the specificity of the drug moiety. Exactly the same molecule, but exhaustively fluorinated at the terminal carbon atom of the alkyl radical, is likely to be characterized by lower specificity and higher activity under the additive (or synergistic) action of metabolically active groups

ASSESSMENT OF INDICES OF NONSPECIFIC RESISTANCE OF THE ORGANISM IN CONDITIONS OF NARROWING OF THE LUMEN OF THE TRACHEA IN AN EXPERIMENT

The narrowing of the lumen of the trachea due to cicatricial stenoses of the trachea is one of the urgent problems of the modern surgery.  The processes taking place in the trachea and lungs lead to a change in the state of the immune system. Assessment of the dynamics of  indices of nonspecific resistance is one of the methods for assessing  the severity of the course of the disease. We studied the indices of  nonspecific resistance of the organism in narrowing the lumen of the  trachea in an experiment in the early postoperative period.  The study was carried out on the basis of the scientific department  of experimental surgery with the vivarium of Irkutsk Scientific  Centre of Surgery and Traumatology, on 24 white male Wistar rats  with a body weight of 300–350 g. We simulated narrowing the lumen of the trachea by placing a silicone tube in the lumen of the trachea  for 14 days. The parameters of phagocytosis, the state of phagocytic activity of blood neutrophils, spontaneous NBT-test, induced NBT- test were studied. The animals were withdrawn from the experiment  on the 3rd, 7th and 14th day. We revealed that as a result of  narrowing of the lumen of the trachea with the original procedure,  the nonspecific resistance of the organism was violated with  inhibition of the phagocytic activity of leukocytes. There was  inhibition of phagocytic activity of leukocytes and depletion of the  functional reserve of leukocytes

Mitochondrial dysfunction at atherosclerosis and myocardial infarction: molecular and cytochemical cell-markers

We studied capabilities of confocal laser scanning microscopy in the analysis of lipid droplets volume and of quantity of functional mitochondria and reactive oxygen species production in liver cells for early diagnosis of cytochemical disturbances at dyslipoproteinemia (16 days of experiment). The results showed the increase of lipid droplets volume in hepatocytes, decrease of functional mitochondria and increase of reactive oxygen species production. We evaluated the potential of real-time PCR method in the analysis of mitochondrial DNA of blood plasma at early stages of dyslipoproteinemia and in experimental infarction. On the background of registered blood lipid metabolism disorders and structural and functional changes in liver cells, we determined the tendency to three-time increase in concentration of circulating cell-free mtDNA on the 16th day of dyslipoproteinemia as compared to the control data. We used a model of myocardial infarction to show statistically significant increase in the level of circulating cell-free blood mtDNA from 48 hours after adrenaline injection and we found that this level maintained up to 144 hours after adrenaline injection. Obtained data can serve as a basis for creation of technologies for diagnostic monitoring of atherosclerosis and myocardial infarction severity