Depletion of COPI in cancer cells: the role of reactive oxygen species in the induction of lipid accumulation, noncanonical lipophagy and apoptosis.

The coatomer protein complex 1 (COPI) is a multisubunit complex that coats intracellular vesicles and is involved in intracellular protein trafficking. Recently we and others found that depletion of COPI complex subunits zeta (COPZ1) and delta (ARCN1) preferentially kills tumor cells relative to normal cells. Here we delineate the specific cellular effects and sequence of events of COPI complex depletion in tumor cells. We find that this depletion leads to the inhibition of mitochondrial oxidative phosphorylation and the elevation of reactive oxygen species (ROS) production, followed by accumulation of lipid droplets (LDs) and autophagy-associated proteins LC3-II and SQSTM1/p62 and, finally, apoptosis of the tumor cells. Inactivation of ROS in COPI-depleted cells with the mitochondrial-specific quencher, mitoquinone mesylate, attenuated apoptosis and markedly decreased both the size and the number of LDs. COPI depletion caused ROS-dependent accumulation of LC3-II and SQSTM1 which colocalizes with LDs. Lack of double-membrane autophagosomes and insensitivity to Atg5 deletion suggested an accumulation of a microlipophagy complex on the surface of LDs induced by depletion of the COPI complex. Our findings suggest a sequence of cellular events triggered by COPI depletion, starting with inhibition of oxidative phosphorylation, followed by ROS activation and accumulation of LDs and apoptosis.

[Recommendations on the Use of Non-Vitamin K Antagonist Oral Anticoagulants in Patients with Atrial Fibrillation (Based on 2018 European Heart Rhythm Association Practical Guide)].

Non-vitamin K antagonist oral anticoagulants (NOACs) - direct oral anticoagulants - are getting the ever-broadening use in clinical practice. However, many problems related to optimal use of NOACs in specific clinical situations remain unresolved. European Heart Rhythm Association in April 2018 issued the renovated recommendations on the use of NOACs in patients with atrial fibrillation. The authors of recommendations presented some specific clinical variants for which they formulated practical advices based on the evidence obtained in randomized clinical trials. They also outlined the indications for use of NOACs, formulated practical start-program and scheme of subsequent follow-up management of patients taking NOACs. Recommendations contain information on pharmacokinetics of NOACs and their interactions with other drugs, consideration of feasibility of NOACs use in patients with chronic renal insufficiency or advanced liver disease. Many other practical problems are covered as well.

[Antiplatelet therapy in cardiology].

Platelets are important components of hemostasis and play a key role in the formation of atherothrombosis. Rupture or erosion of atherosclerotic plaque gives rise to a thrombus with the involvement of platelets. Antiplatelet agents are instrumental in preventing the development of atherothrombosis of different localization, including coronary arteries.

[Traumatic myocardial infarction].

The paper reports development of acute myocardial infarction as a result of blunt chest injury in a woman having no signs of atherosclerosis. Coronary bleeding was caused by dissection of intima of the interior interventricular artery. Transdermal coronary intervention included balloon angioplasty and stenting of the anterior interventricular artery.

[Positive effect of low-activity thromboxane A synthase gene on prognosis in coronary heart disease].

AIM: To analyze the influence of pharmacogenetic factors on the risk of clopidogrel resistance and cardiovascular events during 18-months follow-up. SUBJECTS AND METHODS: Two hundred and fifty patients taking clopidogrel were examined. Platelet function was determined by optical aggregometry. Thromboxane A synthase 1 (TBS1) gene polymorphism was investigated in all the patients. The impact of TBS1 gene polymorphism on the risk of clopidogrel resistance and cardiovascular events was analyzed during 18 months of follow-up. RESULTS: The carriage of TBS1 gene polymorphism AA was shown to affect the risk of clopidogrel resistance. Cardiovascular complications significantly less frequently occurred in TBSI gene polymorphism AA carriers during 18 months. CONCLUSION: The carriage of a slow AA allele of the'TBS1 gene is suggested to be a clinically significant protective factor in the secondary prevention of coronary heart disease

[CLINICAL AND PHARMACOLOGICAL FACTORS INFLUENCING RESISTANCE TO CLOPIDOGREL IN PATIENTS WITH CARDIOVASCULAR DISEASES].

We analysed clinical and pharmacological factors influencing resistance to clopidogrel in 250 patients with cardiovascular diseases during 18 months. It was shown that the risk ofresistance depends on the form of coronary heart disease, carbohydrate metabolism, the AA genotype of CYP2C19*2 and TBS1 genes. The cardiovascular events significantly morefrequently occurred during 12 and 18 months in resistant diabetics and in the patients with an allele lacking the *2/*3 CYP2C9 gene function and AT/TT polymorphism of the thromboxane synthase gene TBS1.

BK virus nephropathy in a pediatric patient after hematopoietic stem cell transplantation.

We report the case of a seven-yr-old Caucasian girl who presented with progressive deterioration of renal function 13 months after HSCT for myelodysplastic syndrome. BK virus nephropathy was suspected and confirmed. After reduction of immunosuppression and treatment with IVIG, leflunomide, ciprofloxacin, and cidofovir, clearance of BK virus from blood was achieved, and further progression or renal failure was prevented. We believe that BK virus nephropathy should be considered in cases of renal function deterioration in all immunocompromised patients.

[Modern approaches to the primary prevention of the development of psychoactive substance dependence on the base of accounting of environmental and genetic risk factors].

In the work there was performed an assessment of the interaction of microsocial and genetic factors of the development of psychoactive substance (PS) dependence. The objects of the psycho-hygienic and molecular-genetic studies were 538 male patients from the specialized diagnostic and treatment center at the age from 17 to 65 years with a diagnosis of "PS dependence" according to F10-F09 in the ICD-10. There were determined personality predictors of early (before 25 years) manifestation of systematic abuse, such as low self-control, individualisticity, authoritarianism, unjustified optimism and reduced capacity for social adaptation. Manifestation of the PS dependence at an early age (25 years) is determined by the contribution of genotype 9R+ DAT gene in the combination with other predisposing genotypes A1 + DRD2/ANKK1, SS SERT and 7R+ DRD. The risk of development of PS dependence at a more younger age increases with the superimposition of individual predisposing genotypes ranging from 1,2 (7R+ gene DRD4) to 1,9 (A1 + gene DRD2/ANKK10 on a destructive milieu. Pairwise combinations of genotypes 7R+ DRD4 x A1+ DRD2, 7R+ DRD4 x 9R+ DAT, 9R+ DAT x A1+ DRD2, 9R+ DAT x SS SERT significantly increase the risk by 2 or more times (2.5-2.8). There was suggested an algorithm for the prenosological forecast of the development of PS dependence in adolescents and young men.

[Clinical and genetic markers of chronic cerebral ischemia].

OBJECTIVE: To study the effectiveness of common neuropsychological tests for the verification of the diagnosis of cerebral ischemia (CE) and a role of polymorphisms in SERT, ApoE and BDNF genes in its development. MATERIAL AND METHODS: We studied 272 inpatients, aged from 37 to 70 years, with CE of the first stage (58 patients), CE of the second stage (121 patients) and CE of the third stage (93 patients). A set of neuropsychological tests, as well as biochemical and molecular-genetic studies were performed. RESULTS AND CONCLUSION: Reitan test was the most effective test for the diagnosis of cognitive impairment. The results of the Clock Drawing Test and MMSE were correlated with the disease severity but did not distinguish between the first and second stages of CE. Arterial hypertension and stenosing atherosclerosis of brain vessels were significant predictors of CE. SERT gene was a marker of the CE risk in men. The genotype SS was associated with the risk of CE with early age-at-onset. No association of ApoE and BDNF genes with CE was found.

D1/NMDA receptors and concurrent methamphetamine+ HIV-1 Tat neurotoxicity.

The interactive effects of HIV-1 infection and methamphetamine (METH) abuse in producing cognitive dysfunction represent a serious medical problem; however, the neural mechanisms underlying this interactive neurotoxicity remain elusive. In this study, we report that a combination of low, sub-toxic doses of METH + HIV-1 Tat 1-86 B, but not METH + HIV-1 gp120, directly induces death of rodent midbrain neurons in vitro. The effects of D1- and NMDA-receptor specific antagonists (SCH23390 and MK-801, respectively) on the neurotoxicity of different doses of METH or HIV-1 Tat alone and on the METH + HIV-1Tat interaction in midbrain neuronal cultures suggest that the induction of the cell death cascade by METH and Tat requires both dopaminergic (D1) and N-methyl D-aspartate (NMDA) receptor-mediated signaling. This interactive METH+Tat neurotoxicity does not occur in cultures of hippocampal neurons, which are predominately glutamatergic, express very low levels of dopamine receptors, and have no functional dopamine transporter (DAT). Thus, the presence of a subpopulation of neurons capable of dopamine release/uptake is essential for METH+Tat induction of the cell death cascade. Overall, our results support the hypothesis that METH and HIV-1 Tat disrupt the normal conjunction of signaling between D1 and NMDA receptors, resulting in neural dysfunction and death.

[Molecular genetic mechanisms of individual sensitivity to synthetic fatty acids in case of valproic acid].

Individual sensitivity to structural analogues of free fatty acids (FFA), some of which are endocrine destructors, resulting in hormonal metabolic disturbances, was studied using valproic acid (VA) as an example. The individual sensitivity was considered by the example of polymorphism in the PPAR@g2 gene. The homozygous genotype Pro12Pro of this gene was proved to be responsible for weight gain and development of insulin resistance during VA administration, which should be kept in mind when developing the safe levels of exposure to FFA-like substances.

[CARD15 and TLR4 genes polymorphisms in atopic bronchial asthma].

In order to investigate whether single nucleotide polymorphisms G(+2722)C and 3020insC in CARD15 gene and Asp299Gly in TLR4 gene contribute to atopic bronchial asthma we performed a comparative analysis of alleles and genotypes frequencies of these polymorphisms in Russian patients from Moscow. DNA samples from 283 patients with atopic bronchial asthma and 227 healthy donors were genotyped. There were associations neither of G(+2722)C and 3020insC in CARD15 gene and Asp299Gly in TLR4 gene with asthma nor of markers of CARD15 gene with asthma severity. Haplotype frequency analysis of CARD15 gene polymorphisms did not reveal significant difference between groups. However, a strong association was found between Asp299Gly and asthma severity. Allele Asp of this marker showed association with mild atopic bronchial asthma and allele Gl--with moderate/severe asthma = 0.47, 95% CI [0.24-0.93] i OR = 2.12, 95% CI [1.08-4.18] respectively).

HIV-1 protein-mediated amyloidogenesis in rat hippocampal cell cultures.

Since the beginning of the highly active antiretroviral therapy (HAART) era, epidemiological evidence indicates an increasing incidence of Alzheimer's (AD)-like brain pathology in aging HIV patients. Emerging evidence warns of potential convergent mechanisms underlying HIV- and Abeta-mediated neurodegeneration. We found that HIV-1 Tat B and gp120 promote the secretion of Abeta 1-42 in primary rat fetal hippocampal cell cultures. Our results demonstrate that the variant of Tat expressed by the neurotropic subtype of HIV-1 virus (HIV-1 clade B) specifically induces both the release of amyloidogenic Abeta 1-42 and the accumulation of cell-bound amyloid aggregates. The results of the research rationalize testing of the ability of beta-amyloid aggregation inhibitors to attenuate HIV protein-mediated cognitive deficits in animal models of NeuroAIDS. The long-term goal of the study is to evaluate the potential benefits of anti-amyloidogenic therapies for management of cognitive dysfunction in aging HIV-1 patients.

[Association of interleukin-13 gene polymorphisms with atopic bronchial asthma].

A comparative analysis of allele and genotype distribution of C(-1055)T and R130Q IL13 gene polymorphisms has been performed in Russian patients from the Moscow region. In the study, 283 DNA specimens of atopic bronchial asthma (BA) patients and 227 DNA specimens of healthy donors were used. No association of these markers with ABA development as well as with total IgE concentration has been found. Haplotype frequency analysis did not reveal significant difference between samples. However, significant association ofC(-1055)Tpolymorphism with the disease severity has been revealed (OR = 2.39, 95% confidence interval 1.44-3.98, p = 0.001). Therefore, C(-1055)T polymorphism was shown to be associated with atopic BA progression.

[Association between dopamine (DRD2) and serotonin (5HTR2A) gene polymorphisms with the indicators of adolescent behavior adaptiveness].

The paper gives the results of a study of the impact of dopamine (DRD2) and serotonin (5HTR2A) genes on the development of personality characteristics in adolescents, by applying the Cattell (16PF) questionnaire. The study was performed in a group of 360 Moscow teenagers (185 girls and 175 boys) aged 14-17 years. The boys carrying the A1 allelle of the DRD2 gene were found to have a lower self-control, indiscipline, and impulsiveness. An association between the indicators of unconscientiousness, social introversion, and group independence was established in the girls with the G/G genotype of the 5HTR2A gene. Thus, gender differences have been revealed from the impact of dopamine and serotonin gene polymorphisms on the teenagers' personality characteristics that characterize the forms of disadaptive behavior, such as unconscientiousness, indiscipline, low self-control, and impulsiveness.

[An association between the FABP2 gene polymorphism and efficacy of valproates].

To search for association between the 163G>A polymorphism of the fatty acid binding protein 2 (FABP2) gene and intracellular transport of the valproic acid in the small intestines, 168 patients with different forms of epilepsy, aged from 1 to 89 years, and different illness duration have been studied. The patients received valproates (127 patients) and topiramate (41 patients) as a monotherapy. It has been shown that the 163G>A (Ala54Thr) polymorphism exerts an influence on effective dose of the valproic acid but not of topiramate.

[D3 dopamine receptor gene Ser9Gly polymorphism in Russian patients with schizophrenia]. / Izuchenie polimorfizma Ser9Gly gena dofaminovogo retseptora D3 u bol'nykh shizofreniei iz russkoi populiatsii.

Polymorphic marker Ser9Gly of dopamine receptor D3 gene is considered perspective for associative studies of schizophrenia. Allele and genotype frequency of this polymorphism were studied in different ethnic groups of schizophrenic patients as well as the attempts have been made to reveal an association with clinical presentations of the disease. However, the results are inconsistent. The present study aimed at investigating Ser9Gly DRD3 gene polymorphism in Russian sample of schizophrenic patients. One hundred and fifty patients with ICD-10 diagnosis of schizophrenia (broad definition), 69 male and 81 female, aged 34.8+/-13.87 years, age at disease onset 24.3+/-9 years, have been examined. Control group consisted of 150 healthy subjects without family history of schizophrenia, 60 male and 90 female, aged 32.7+/-13.5 years. No between-group differences have been found for Ser9Gly DRD3 allele and genotype frequencies. However, a frequency of homozygous genotype Gly/Gly was significantly higher in female patients, comparing to female controls (p=0.038 Yate's corrected, OR 9. CI 0.95% 1.0-79.5). A role of sex-dependent association between Ser9Gly DRD3 polymorphism and schizophrenia is discussed.