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In this study, we studied the activity of the antibacterial drugDoxycycline (Russia), and the control was the drug of pentavalent antimony - Glucantim (France), which for a long time was the "gold standard" in the treatment of any form of leishmaniasis. In the course of the experiment, the leading positions of doxycycline established in vitro. Its minimum doses lead to absolute suppression of the mobility of the pathogen L. major. Increasing the therapeutic dose of the drug is not justified. Comparison of this drug with the gold standard of therapy with meglumine antimonate (glucantim) showed its superiority in all indicators.

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Helminth infestations, including trematodoses, are a group of the most common diseases in the world. Trematodoses cause significant damage to human health, lead to various complications, which also causes significant economic damage. To develop effective anthelmintic drugs, it is necessary to study the structure and physiology of parasites and interaction with the host body. To create specific anthelmintic drugs, it is necessary to study the features of biochemistry and molecular biology of the structural components of the covers of trematodes. The is important role of the tegument in the evasion of the immune response. The trematode tegument antigens are good candidates for the development of anthelmintic vaccines. It is important to study the trematode genome and identify specific enzyme systems. Proteases of tegument of trematodes are digestive enzymes that can destroy the immunoglobulins of the host to modulate the immune response. Identification of specific differences in protein and enzyme systems will create more effective drugs for the treatment of helminthiasis.

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Malaria is one of the most important and common infectious diseases in the world. The world health organization estimates 225 million malaria cases worldwide. Malaria is one of the strongest selective factors affecting the human genotype. The greatest pressure of malaria pathogens had on the inhabitants of the tropical belt, in which invasion was the main factor of genetic selection. As a result, there were genetic diseases such as sickle cell anemia, thalassemia, glucose-6-phosphate dehydrogenase deficiency and others. An important role in the pathogenesis of malaria is the stage of penetration of the parasite of malarial Plasmodium into the erythrocyte. Changes in the structure of surface antigens of red blood cells may contribute to or reduce the effectiveness of invasion. Genetic polymorphism associated with the pathogenesis and characteristics of the malaria clinic is also important in the development of malaria resistance. Understanding the genetic changes associated with red blood cell disorders and pathogenesis can provide insights into the development of new strategies for malaria treatment and prevention.

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Helminthiases caused by parasitic nematodes are widespread in different regions of the world. The main adaptation for overcoming adverse conditions is a barrier properties of the cuticle surface structure, which differs from the membrane teguments of trematodes and cestodes. Different types of nematodes have specific structural and biochemical adaptations at different stages of their life cycle. While creating specific areas of habitat and nutrition, some types of parasites change the morphology and functioning of the host tissues. Ascaris suum and Caenorabditis elegans were widely used as model organisms in the study of genetics, biochemistry of nematodes. Studying of biochemistry and molecular biology of structural components of nematode surfaces is important for development of effective and safe anthelmintic drugs. The differences in the structure and functioning of transport enzymes of parasites and humans will help to create effective specific inhibitors and anthelmintic remedies. An important point of application of anthelmintic drugs can serve as inorganic ions transport proteins in the membranes of the surfaces. Glycolipids of cuticle contribute to the evasion from the host immune system, protecting the surface proteins from degradation by proteases. Study of helminth surfaces makes an important contribution to the development of anthelmintic drugs and vaccines, for helminthiasis treat.

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One of the most poorly studied areas of protozoology is metabolic processes of parasitic protozoa. Study of the biochemistry of parasites required for the development of effective chemotherapy of protozoal diseases. Some amitochondrial parasites of humans, such as Giardia intestinalis, Entamoeba histolytica, Trichomonas sp., living in an environment with low oxygen content, have specialized cellular organelles-hydrogenosomes (like mitochondria provide cells with simple energy). The study of the functioning of these organelles allows us to consider them as targets for the development of аntiprotozoal drugs. The target for chemotherapy in the treatment of trypanosomiasis can be processes related to the characteristics of the glycolytic pathway or a decrease in the level of energy substrate, such as glucose. This leads to a rapid decrease in ATP levels in the cell of the parasite, an overall loss of mobility and disappearance of trypanosomes from the bloodstream of the infected host. Also, glucose transporters located in the membrane of the parasite can be targets for drugs.

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Lungworm infection is caused by a Dictyocaulus filaria nematode parasitizing the bronchi and bronchioles of sheep and goats. Various anthelmintics, including albendazole, levamisole, fenbendazole, ivermectins, and others, are used to treat the animals. The aim of this investigation was to study the impact of lungworm infestation on the biochemical parameters of animals during combination treatment with albendazole and T- and B-activin. Experiments were carried out in 20 uninfected mongrel lambs aged 4-5 months. Infectious D.filaria larvae were given with water to 15 lambs once orally at a dose of 1000 larvae per head. 5 uninfected lambs served as a control group. The time course of changes in serum bio- chemical parameters was studied in animals. Treatment with Albena in combination with T- and B-activin in lambs ex- perimentally infested with lungworm was found to restore their biochemical reactivity. After sheep treatment with Albena alone, biochemical parameters were noted to tend to normalize, but their normal full recovery did not take place.

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Genetic resistance to malaria is associated with various genetic factors, including erythrocytic variability and variability of the genes involved into the pathogenetic process. Some genetic anomalies resulted from selective malaria pressure, which brought into existence different forms of hemoglobinopathies, glucose-6-phosphate dehydrogenase deficiency, and no Duffy antigens, and ovalocytosis, etc., which ensured varying malaria resistance. Cell adhesion is a major factor in the pathogenesis of malaria. Adhesion molecules express on the cellular membranes of the endothelium, platelets, macrophages, red blood cells and serve as binding receptors for membrane proteins PFRMP-1 of P. falciparum. Polymorphism of the CD36, ICAM-1, and PECAM1 genes can lower binding to blood vessel endothelial cells, which reduces the number of clinical forms of malaria. The high serum TNF-alpha level that is caused by mutation in the promoter of the TNF-alpha gene is associated with cerebral malaria. TNF-alpha enhances the endothelial expression of adhesion molecules, by increasing the adhesion of infected erythrocytes, including that in cerebral capillaries, by inducing in patients local thrombosis and inflammation with release of the cytokines--TNF-alpha. The products of inflammatory infiltrates attack the endothelium, by leading to the imbibition of plasma and erythrocytes in brain tissue and causing a cerebral form of malaria.

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Nuclear receptors are transcription factors that are essential in embryonic development, cellular differentiation, metabolism. Ligand-regulated nuclear PXR receptor responds to diverse arrays of chemically distinct ligands, xenobiotics, drugs and regulates expression of the genes involved in xenobiotic and drug metabolism. The structural basis of the receptor provides interaction with a variety of ligands which are agonists or antagonists. Nuclear receptors researches are important for design of metabolism regulating drugs and in drug interaction studies.

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