INTERDEPENDENCE OF THE MICROBIOCENOSE COMPOSITION OF BIOPELLICLE AND THE SEVERITY DEGREE OF CHANGES IN THE MUCOSA OF THE GUMS AFTER TEN WEEKS OF EXPERIMENTAL OPIOID EXPOSURE.

OBJECTIVE: The aim: To study the relationship between the degree severity of changes in the tunica mucosa of the rats gums and the composition of the microbiota of tooth surface in the gingival margin under the ten-week action of the opioid. PATIENTS AND METHODS: Materials and methods: The study was performed on 34 male rats, weighing 160 - 255 g, aged 4.5 - 7 months. Animals were administered nalbuphine for 10 weeks, gradually increasing the dose (0.212 - 0.283 mg/kg). The research of the bacterial from the microbiotope of tooth surface in the gingival margin of rats was performed using statistical analysis of quantitative results. RESULTS: Results: The 4 stages of development of the pathological process and changes in the qualitative and quantitative composition of the microbiocenosis in the gingival margin of the oral mucosa are determined. Depending on the severity of pathological changes in the mucous membrane of the gums of rats under the long-term action of the opioid, a significant increase in the quantitative indicators of bacterial species of pathogenic and opportunistic microbiota at degree IV of the process compared with degree I. The appearance of potential pathogens of purulent-inflammatory processes - Klebsiella and Pseudomonas aeruginosa was noted. CONCLUSION: Conclusions: The relationship between the quantitative and qualitative characteristics of the microbiocenosis of tooth surface in the gingival margin and the severity of changes in the mucous membrane of the of rats gums under the ten-week action of the opioid was determined, indicating bacterial associations of dental biopellicle as an etiological factor.

INFLUENCE OF COMBINED PHARMACOTHERAPY ON CARDIO-VASCULAR SYSTEM OF ARTERIAL HYPERTENSION (IN EXPERIMENT).

OBJECTIVE: The aim: Study of the patterns of structural changes in the left ventricular myocardial capillaries of rats with arterial hypertension with combined pharmacotherapy with Bisoprolol and Thiotriazolinum. PATIENTS AND METHODS: Materials and methods: Experiments were conducted on 30 line rats with congenital stress-induced arterial hypertension: 10 animals without treatment and 10 animals with treatment. Pharmacological correction of spontaneous arterial hypertension was performed with 20 mg / kg of Bisoprolol and 50 mg / kg of Thiotriazolinum per os once a day. Pharmacotherapy began at 5 months of age, that is, at a time when compensated heart failure was formed in rats with arterial hypertension. Animals were withdrawn from the experiment 100 days after the start of the correction. Control was provided by intact animals (10 rats) of the corresponding age. While extracted from the experiment rats of all experimental groups had their arterial pressure measured using a plethysmograph, electron microscopic examination of the left ventricular myocardium and morphometric study of volumetric and quantitative densities, cross-section area and form factor of micropinocytotic vesicles were conducted. RESULTS: Results: In rats with arterial hypertension after application of Bisoprolol and Thiotriazolinum, arterial pressure significantly decreases in experimental rats compared to animals without correction. The number of capillaries in the myocardium after pharmacotherapy increases up to control values, which shows their reparation. In most endothelial cells, organelles retain their integrity and presence that are characteristic of intact rats. The well-expressed processes of transcytosis are shown by the statistical similarity of the quantitative density and the size of the micropinocytotic vesicles in the endothelial cells of the myocardium capillaries of compared experimental animals. CONCLUSION: Conclusions: In rats with arterial hypertension, the combination of Bisoprolol and Thiotriazolinum prevents the decrease in the number of capillaries in the myocardium of the left ventricle, promotes the preservation of the ultrastructure of their endothelial cells and maintains the processes of transedothelial transfer of substances at the level of intact animals.

Morphofunctional status of cardio-vascular system of rats with arterial hypertension.

OBJECTIVE: The aim: Was to clarify the general patterns of structural changes in the left ventricular myocardial capillaries in rats with spontaneous arterial hypertension. PATIENTS AND METHODS: Materials and methods: Experiments were conducted on 50 ISIAH (inherited stress-induced arterial hypertension) line rats with arterial hypertension: juvenile young (45-day) and sexually mature (100-day) rats, as well as intact animals of the corresponding age. While extracted from the experiment rats of all experimental groups had their arterial pressure measured using a plethysmograph. Electron microscopic examination of the left ventricular myocardium and morphometric study of volumetric and quantitative densities, cross-section area, and form factor of micropinocytotic vesicles were conducted. RESULTS: Results: In sexually mature rats with arterial hypertension, a high level of pressure is maintained. In 45-day-old rats with arterial hypertension in endothelial cells of myocardial blood capillaries there is a hyperactivation of biosynthetic processes (euchromatic nucleus, large-sized mitochondria, ER canals, Golgi complex), which may be a manifestation of reactive processes in response to a non-stable increase in arterial pressure. In the 100-day rats with arterial hypertension, the mosaic of the ultrastructure of the myocardium blood vessels is preserved, but destructively-dystrophic changes become more expressive and involve not only the organelles but also the integrity of the endothelial cell itself. Destructively-dystrophic processes in rat capillaries are accompanied by compensatory and adaptive ones. This is manifested by activation of the transport of substances, both transendothelial and paracellular, and quantitative density of micropinocytotic vesicles increases statistically significantly. CONCLUSION: Conclusions: In myocardial capillaries of young (45-day) arterial hypertension rats, compensatory and adaptive changes are manifested by activation of biosynthetic processes in endothelial cells following a slight increase in micropinocytotic vesicles quantitative density and signs of destructive-dystrophic processes (minor edema and lysis of endothelial cell cytoplasm). In sexually mature (100-day) arterial hypertension rats in the blood capillaries of the myocardium, the destructive-degenerative changes increase is accompanied by preservation of signs of compensatory processes. Reducing the number of capillaries is offset by an increase in the number of micropinocytotic vesicles.