Publications by authors named "Sargsyan E"

Along with several social institutions, the family has its unique place as the foundation of a strong state. For this reason, family problems are at the center of research in modern psychological science aimed at identifying key factors of health, well-being and a prosperous life in the family. The purpose of this work is to identify the ability of spouses to cope with family difficulties or conflict situations and to study their correspondence to the manifestations of a person's emotional intelligence as a guarantee of satisfaction and family health.

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Introduction: In German and international research networks different approaches concerning patient consent are applied. So far it is time-consuming to find out to what extent data from these networks can be used for a specific research project. To make the contents of the consents queryable, we aimed for a permission-based approach (Opt-In) that can map both the permission and the withdrawal of consent contents as well as make it queryable beyond project boundaries.

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KCNQ1 voltage-gated K+ channels are involved in a wide variety of fundamental physiological processes and exhibit the unique feature of being markedly inhibited by external K+. Despite the potential role of this regulatory mechanism in distinct physiological and pathological processes, its exact underpinnings are not well understood. In this study, using extensive mutagenesis, molecular dynamics simulations, and single-channel recordings, we delineate the molecular mechanism of KCNQ1 modulation by external K+.

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Article Synopsis
  • - The transcription factor ZBED6 represses the IGF2 gene by binding to a specific site in its intron, and its deletion or knockout results in a significant increase of IGF2 protein levels, enhancing muscle growth.
  • - Analysis shows that both ZBED6 and IGF2 myoblasts have faster growth rates and altered expression of proteins related to mitochondrial function and muscle development.
  • - Overexpression of ZBED6 leads to negative effects like cell death and halted muscle cell differentiation, indicating its critical role in regulating muscle metabolism through the IGF2 pathway.
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Objective: To delineate potential mechanisms for fasting hyperglucagonemia in childhood obesity by studying the associations between fasting plasma glucagon concentrations and plasma lipid parameters and fat compartments.

Methods: Cross-sectional study of children and adolescents with obesity (n = 147) and lean controls (n = 43). Differences in free fatty acids (FFAs), triglycerides, insulin, and fat compartments (quantified by magnetic resonance imaging) across quartiles of fasting plasma glucagon concentration were analyzed.

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The naturally occurring quassinoid compound brusatol improves the survival of insulin-producing cells when exposed to the proinflammatory cytokines IL-1β and IFN-γ in vitro. The aim of the present study was to investigate whether brusatol also promotes beneficial effects in mice fed a high-fat diet (HFD), and if so, to study the mechanisms by which brusatol acts. In vivo, we observed that the impaired glucose tolerance of HFD-fed male C57BL/6 mice was counteracted by a 2 wk treatment with brusatol.

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Elevated levels of palmitate accentuate glucose-stimulated insulin secretion (GSIS) after short-term and cause beta-cell dysfunction after prolonged exposure. We investigated whether metformin, the first-line oral drug for treatment of T2DM, has beneficial effects on FFA-treated human islets and the potential mechanisms behind the effects. Insulin secretion, oxygen consumption rate (OCR), AMPK activation, endoplasmic reticulum (ER) stress and apoptosis were examined in isolated human islets after exposure to elevated levels of palmitate in the absence or presence of metformin.

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In obese children with high circulating concentrations of free fatty acid palmitate, we have observed that insulin levels at fasting and in response to a glucose challenge were several times higher than in obese children with low concentrations of the fatty acid as well as in lean controls. Declining and even insufficient insulin levels were observed in obese adolescents with high levels of the fatty acid. In isolated human islets exposed to palmitate we have observed insulin hypersecretion after 2 days exposure.

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Background: Long-term exposure to elevated levels of free fatty acids (FFAs) is deleterious for beta-cell function and may contribute to development of type 2 diabetes mellitus (T2DM). Whereas mechanisms of impaired glucose-stimulated insulin secretion (GSIS) in FFA-treated beta-cells have been intensively studied, biological events preceding the secretory failure, when GSIS is accentuated, are poorly investigated. To identify these early events, we performed genome-wide analysis of gene expression in isolated human islets exposed to fatty acid palmitate for different time periods.

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In obesity fasting levels of both glucagon and insulin are elevated. In these subjects fasting levels of the free fatty acid palmitate are raised. We have demonstrated that palmitate enhances glucose-stimulated insulin secretion from isolated human islets via free fatty acid receptor 1 (FFAR1/GPR40).

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Studies on the pathophysiology of type 2 diabetes mellitus (T2DM) have linked the accumulation of lipid metabolites to the development of beta-cell dysfunction and impaired insulin secretion. In most in vitro models of T2DM, rodent islets or beta-cell lines are used and typically focus is on specific cellular pathways or organs. Our aim was to, firstly, develop a combined lipidomics and proteomics approach for lipotoxicity in isolated human islets and, secondly, investigate if the approach could delineate novel and/ or confirm reported mechanisms of lipotoxicity.

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Background: Free fatty acids (FFAs) acutely stimulate insulin secretion from pancreatic islets. Conflicting results have been presented regarding this effect at non-stimulatory glucose concentration, however. The aim of our study was to investigate how long-chain FFAs affect insulin secretion from isolated human pancreatic islets in the presence of physiologically fasting glucose concentrations and to explore the contribution of mitochondria to the effects on secretion.

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Long-term exposure of beta cells to saturated fatty acids impairs insulin secretion and increases apoptosis. In contrast, unsaturated fatty acids protect beta-cells from the long-term negative effects of saturated fatty acids. We aimed to identify the mechanisms underlying this protective action of unsaturated fatty acids.

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Background: The prevalence of obesity-related diabetes in childhood is increasing and circulating levels of nonesterified fatty acids may constitute a link. Here, the association between palmitate and insulin secretion was investigated in vivo and in vitro.

Methods: Obese and lean children and adolescents (n = 80) were included.

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Fatty acids affect insulin secretion via metabolism and FFAR1-mediated signaling. Recent reports indicate that these two pathways act synergistically. Still it remains unclear how they interrelate.

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Prolonged exposure to palmitate impairs β-cell function and mass. One of the proposed mechanisms is alteration in ceramide (Cer) generation. In the present study, exposure to palmitate induced the level of palmitoyl transferase and Cer synthases, enzymes of the Cer de novo and salvage pathways, and doubled total Cer levels, which was associated with decreased insulin secretion and augmented apoptosis in MIN6 cells and human islets.

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Free fatty acids (FFAs) have pleiotropic effects on the pancreatic β-cell. Although acute exposure to FFAs stimulates glucose-stimulated insulin secretion (GSIS), prolonged exposure impairs GSIS and causes apoptosis. FFAs exert their effects both via intracellular metabolism and interaction with the FFA receptor 1 (FFAR1/GPR40).

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Background: Elevated levels of lipids are detrimental for beta-cell function and mass. One of the mechanisms of how fatty acids induce apoptosis is development of the unfolded protein response (UPR). It is still far from understood how fatty acids activate the UPR, however.

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Background: Prolonged elevated levels of lipids have negative effects on beta-cell function and mass (lipotoxicity). To what extent exposure to high glucose concentration is important in the harmful effects of lipids (glucolipotoxicity) has been debated.

Methods: We addressed beta-cell lipotoxicity by measuring apoptosis in isolated intact control human islets and insulin-secreting cell lines MIN6 and INS-1E cultured in the presence of palmitate and low (5.

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Investigations were carried out to determine antimicrobial and antioxidant properties and total phenol content of three wild species of Ephedra compared with their respective callus cultures. Callus induction was performed in a standard Murashige and Skoog (MS) medium with the following hormonal ranges (mg/L) for every species NAA:1.5, Kin:1 for Ephedra strobiliacea, NAA:2, Kin:1 for Ephedra procera and NAA:2, Kin:0.

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The MedAustron Ion therapy center will be constructed in Wiener Neustadt (Austria) in the vicinity of Vienna. Its accelerator complex consists of four ion sources, a linear accelerator, a synchrotron, and a beam delivery system to the three medical treatment rooms and to the research irradiation room. The ion sources shall deliver beams of H(3)(1+), C(4+), and light ions with utmost reliability and stability.

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Elevated blood levels of glucose and lipids in individuals with type 2 diabetes mellitus have been observed to cause impairment of insulin secretion from pancreatic beta-cells. Chronic exposure to either of the circulating fatty acid oleate or palmitate has different effects on the beta-cell. Whereas palmitate causes functional impairment of the beta-cell and apoptosis, oleate has only minor negative effects on beta-cell function and mass.

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Effects of non-esterified fatty acids (FAs) are accentuated when applied together with elevated glucose through preferential use of glucose as fuel, which leads to decreased oxidation of FAs. We examined how over-expression of the mitochondrial FA transporter carnitine palmitoyltransferase 1 (CPT1) affects glucose-stimulated insulin secretion (GSIS), apoptosis and ER stress in INS-1E cells cultured in the presence of elevated levels of glucose and palmitate. INS-1E cells were infected with Tet-ON regulated adenovirus containing CPT1 and cultured for 48h in the presence of 0.

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Elevated levels of glucose and lipids are characteristics of individuals with type 2 diabetes mellitus (T2DM). The enhanced nutrient levels have been connected with deterioration of beta-cell function and impaired insulin secretion observed in these individuals. A strategy to improve beta-cell function in individuals with T2DM has been intermittent administration of K(ATP) channel openers.

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Prolonged hyperglycaemia leads to impaired glucose-stimulated insulin secretion (GSIS) and apoptosis in insulin-producing beta-cells. The detrimental effects have been connected with glucose-induced lipid accumulation in the beta-cell. AMP-activated protein kinase (AMPK) agonist, 5-aminoimidazole-4-carboxamide ribonucleoside (AICAR), promotes utilization of nutrient stores for energy production.

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