Stable Metabolites Of Nitric Oxide Research Articles

ASSESSMENT OF THE RELATIONSHIP BETWEEN THE CONCENTRATION OF PSGL-1, NO-SYNTHASES AND NITRIC OXIDE METABOLITES IN THE BLOOD SERUM OF PATIENTS WITH ACUTE ARTERIAL THROMBOSIS

Introduction. PSGL-1 is a complex protein, that provides contacts between blood cells and endothelial cells by connecting with cell-adhesion mole-cules selectins, and it is a universal participant in the processes of leukocyte adhesion, inflammation and immune response. The study of the possible regulation of its functioning is an urgent topic, since the process of its interactions with selectins can be a point of therapeutic application. Aim of the study. Evaluation of the relationship between the concentration of universal ligand selectins PSGL-1, inducible (iNOS) and endothelial (eNOS) NO synthases and final metabolites of nitric oxide (II) in the blood serum of patients with acute arterial thrombosis. Material and methods. The concentrations of PSGL-1, iNOS and eNOS in blood serum were determined, using enzyme immunoassay on an enzyme immunoassay analyzer Stat Fax 2100. The total concentration of the final stable metabolites of nitric oxide(II) (nitrates and nitrites) was determined by the spectrophotometric method modified by V.A. Metelskaya, by coloring in the reaction of diazotization with nitrite of sulfonamide present in the com-position of the Griss reagent. The results were processed, using nonparametric statistics methods of Microsoft Office Excel 2016 and IBM SPSS Statistics 26 (StatSoftInc., USA). Results. The study revealed a statistically significant increase in the level of endothelial nitric oxide synthase and the final stable metabolites of nitric oxide in the blood of patients with acute arterial thrombosis, compared with the control group. A direct correlation of moderate severity was also found between the level of eNOS and the concentration of nitrates and nitrites. A low positive correlation was found between the concentration of PSGL-1 and the level of eNOS, and a low negative correlation was found between PSGL-1 and iNOS. Conclusions. According to the results of the study, it can be concluded that nitric oxide, which generated by endothelial NO synthase in patients with arterial thrombosis, may have a regulatory effect on the expression or functioning of the universal glycoprotein ligand of selectins – PSGL-1, which re-quires more in-depth study.

Gut Microbiota and Cytokine Profile in Cirrhosis.

Gut dysbiosis and abnormal cytokine profiles are common in cirrhosis. This study aimed to evaluate the correlations between them. In the blood plasma of cirrhosis patients and controls, 27 cytokines were examined using a multiplex assay. The plasma levels of nitrites (stable metabolites of the endothelial dysfunction biomarker nitric oxide) and lipopolysaccharide (LPS) were examined. The fecal microbiota was assessed by 16S rRNA gene sequencing. Levels of IL-1b, IL-2, IL-6, IL-13, IP-10, IFN-g, TNF-a, LPS, and nitrites were higher in cirrhosis patients than in controls, while levels of IL-4, IL-7, and PDGF-BB were lower. The LPS level was directly correlated with the levels of IL-1b, IL1-Ra, IL-9, IL-17, PDGF-BB, IL-6, TNF-a, and nitrites. The nitrite level was significantly directly correlated with the levels of TNF-a, GM-CSF, IL-17, and IL-12, and inversely correlated with the IL-7 level. TNF-a levels were directly correlated with ascites severity and the abundance of Negativicutes, Enterobacteriaceae, Veillonellaceae, and Klebsiella, while inversely correlated with the abundance of Firmicutes, Clostridia, and Subdoligranulum. IFN-g levels were directly correlated with the abundance of Bacteroidaceae, Lactobacillaceae, Bacteroides, and Megasphaera, and inversely correlated with the abundance of Verrucomicrobiota, Akkermansiaceae, Coriobacteriaceae, Akkermansia, Collinsella, and Gemella. IL-1b levels were directly correlated with the abundance of Comamonadaceae and Enterobacteriaceae and inversely correlated with the abundance of Marinifilaceae and Dialister. IL-6 levels were directly correlated with the abundance of Enterobacteriaceae, hepatic encephalopathy, and ascites severity, and inversely correlated with the abundance of Peptostreptococcaceae, Streptococcaceae, and Streptococcus. The abundance of harmful gut microbiota taxa and endotoxinemia directly correlates with the levels of proinflammatory cytokines.

Stallion Sperm Freezing with Different Extenders: Role of Antioxidant Activity and Nitric Oxide Production.

Sensitivity to freezing remains a critical issue in stallion semen cryopreservation procedures. To explore this topic in-depth, semen was collected from ten stallions, diluted with three different extenders, transported to the laboratory, and then centrifuged and frozen with four different extenders. We conducted analyses of sperm kinetics, mitochondrial membrane potential (MMP), and hydrogen peroxide content both before and after freezing. Additionally, we assessed antioxidant activity using the ABTS and FRAP methods and measured nitric oxide stable metabolites (NOx) in the blank extenders, seminal plasma, and extenders conditioned by spermatozoa before and after freezing. We found significant variability in the antioxidant activity and NOx content of the blank extenders and the seminal plasma. In the seminal plasma, ABTS-based antioxidant activity and NOx values were correlated with some sperm kinematic parameters and MMP in refrigerated semen, while no correlation was observed in frozen sperm parameters. Sperm function varied significantly between stallions but not between extenders, either before or after freezing. However, significant differences in antioxidant activities and NOx values were found among extenders conditioned following freezing. These results provide new insights into the factors contributing to the variability in individual stallions' tolerance to sperm freezing.

N-3 Polyunsaturated Fatty Acids Are Associated with Stable Nitric Oxide Metabolites in Highly Trained Athletes.

The aim of this study was to investigate the relationships between levels of n-3 essential polyunsaturated fatty acids (n-3 PUFAs) and stable nitric oxide (NO) metabolites in the plasma of athletes. Highly trained cross-country skiers (males, n = 39) were examined. The fatty acid profile of the total plasma lipids was determined by gas chromatography. The plasma NO level was studied by a colorimetric method via reaction with Griess reagent. A widespread deficiency of essential n-3 PUFAs in the plasma of athletes (more than 80% of the subjects) was demonstrated in association with an imbalance in the levels of nitrates (NO3) and nitrites (NO2). A lower value of n-3 linolenic acid in the plasma (0.21 mol/%) was associated with a NO3 level below the normal range (n-3 C18:3 and NO3 Rs = 0.461; p = 0.003). Higher levels of n-3 eicosapentaenoic acid (0.8 mol/%) were associated with a concentration of NO2 above the normal value (n-3 C20:5 and NO2 Rs = 0.449; p = 0.004). For the first time, the participation of essential n-3 PUFAs in the nitrite-nitrate pathway of NO synthesis in highly trained skiers was demonstrated.

#1073 Changes in endothelial function in patients with impaired central and renal hemodynamics respiratory pathology

Abstract Background and Aims To determine the degree of influence of endothelial dysfunction on the hemodynamics of renal and central vessels in respiratory pathology, as well as to determine the effectiveness of complex therapy regimens with carvedilol. Method Studies were conducted in 26 patients with chronic obstructive pulmonary disease (COPD) of II- III severity (group 1, in whom the level of glomerular filtration rate of the kidneys eGFR CKD-EPI ≥6 ml/min/1.73 m2 was determined) and 32 patients with COPD of IV severity (group 2, they were determined e GFR CKD-EPI ≥60 ml/min/1.73 m2). Patients received one course of ten-day standard therapy (GOLD, 2020) in combination with a beta–blocker drug, T. carvedilol 5 mg (Vertex). Doppler echocardiographic examination of peripheral vessels, heart and renal vessels of patients was performed. Stable metabolites of nitric oxide (Cm NO) in blood plasma, ventilation and perfusion state of the lungs were determined. Results A significant decrease in the functional state of the respiratory system was parallel with a decrease in Cm NO synthesis, which was clearly reflected in the second group (by 11%) compared with the first group (by 7%). Pronounced structural changes with remodeling of the right parts of the heart, as well as a pronounced degree of pancreatic hypertrophy in the second group were accompanied by a sharp change in renal filtration function (eGFR ≤60 ml/min/1.73 m2). When measuring the state of diastolic dysfunction of the right parts of the heart, a decrease in E/As well as an increase in the circulatory vascular resistance index and mean blood pressure were significantly higher in the first group of patients (where еGFR ≥6 ml/min/1.73 m2). After a course of treatment with t. carvedilol, based on basic treatment, normalization of endothelial function was determined, reflected in an increase in the concentration of stable metabolites of nitric oxide by 1.05 and 1.5 times (p<0.05) in the biological fluid, respectively, in the first and second groups. In the dynamics of the course of therapy in groups of patients with 75% and 35% decrease in lung ventilation capacity, mean pulmonary arterial pressure decreased by 18.1 and 14.3%, respectively, and the hemodynamic resistance index decreased by 7.9% and 5.7% in parallel (p<0.05). Conclusion When monitoring the functional state of central and renal hemodynamics and ventilation-perfusion function of the bronchopulmonary system after complex treatment with carvedilol, a long-term hypotensive effect, a decrease in endothelial dysfunction, respectively, and an improvement in central and renal hemodynamics were determined.

BIOCHEMICAL INDICATORS OF GASTRIC JUICE IN INCOMPETENCE OF THE PHYSIOLOGICAL GASTRIC CARDIA

Aim. This study aimed to evaluate the biochemical characteristics of gastric juice in cases incompetence of the physiological cardia (IPC) at the gastroesophageal junction. Methods. Gastric juice samples were collected from 42 patients diagnosed with hiatal hernia (HH) at the State Institution "Institute of Gastroenterology of the National Academy of Medical Sciences of Ukraine". Patients were classified into type I (sliding) HH (n=26) and type II (paraesophageal) HH (n=16), with a control group of healthy volunteers (n=9). Results. Analysis included pH, pepsin concentration, bile acids, total calcium and stable metabolites of nitric oxide (NOx). In type I HH, gastric juice showed increased pH (3.73±0.49) and elevated pepsin concentration (1.33±0.22 mg/ml) compared to controls (p<0.01 and P<0.05 respectively), indicating hypoacidity and hyperfunction of chief cells. Type II HH exhibited pH levels (2.34±0.72) similar to controls and no significant difference in pepsin concentration. NOx levels in type I HH were lower (P<0.05) compared to controls, suggesting reduced NOergic system activity. Calcium concentration in gastric juice did not significantly differ between groups. Conclusions. These findings suggest that type I HH is associated with disturbances in gastric secretion regulation, possibly unrelated to duodenogastric reflux. Further investigation is warranted to elucidate the underlying pathophysiological mechanisms.

Effect of per os administration of fucoxanthin alcoholic and oil extracts to Balb/c mice on biochemical parameters and serum cytokine level

Microalgae are a source of various biologically active substances, including carotenoids. One of the carotenoids of diatom microalgae is fucoxanthin, which has antioxidant, antimicrobial, antitumour and anti-inflammatory properties that can be used in the treatment of a wide range of human and animal pathologies. The aim of the study was to investigate the effect of alcohol and oil extract of fucoxanthin on biochemical parameters and levels of serum cytokines in mice during intragastric administration. Material and methods. Fucoxanthin extracts from the microalga Nanofrustulum shiloi were used. Mice of Balb/c strain were intragastrically administrated with 0.5 ml of oil (500 μg/ml) or alcoholic extract of fucoxanthin (187.5 μg/ml), mice in the comparison group were given 0.5 ml of olive oil or 45% ethyl alcohol once a day within 5 days. On the 8th day, blood serum was obtained and the level of albumin, triglycerides, cholesterol, low (LDL) and high density lipoproteins (HDL), urea, uric acid, creatinine, aspartate (AST) and alanine aminotransferases (ALT), lactate, stable nitric oxide (NO) metabolites (nitrites), cytokines (IL-1β, IL-6, IL-10, TNF-α, IFN-γ) was determined using ELISA with photometric detection. Results and discussion. In the comparison group, ethyl alcohol promoted an increase in serum triglyceride, cholesterol, LDL, HDL, ALT, AST, nitrite, IL-10, IFN-γ and TNF-α content compared to intact animals. Fucoxanthin alcoholic extract administration increased the level of LDL, HDL, uric acid, TNF-α and decreased albumin, cholesterol, uric acid, creatinine, ALT, AST, IL-6 content compared to control. The olive oil group showed a decrease in serum triglycerides, cholesterol, urea, uric acid, ALT and AST content but an increase in LDL, HDL, nitrite level compared to the control. Administration of fucoxanthin oil extract to animals decreased albumin, triglycerides, cholesterol, HDL, uric acid, ALT, AST, lactate, IL-6, IL-10 compared to control. Conclusions. Thus, it was discovered that fucoxanthin in Balb/c mice contributes to a decrease in hepatic synthetic function, as evidenced by the change in the concentration of albumin, triglycerides, uric acid), influences energy metabolism (creatinine, lactate), cell membrane stability (cholesterol, LDL, HDL), serum transaminase activity, pro- and anti-inflammatory cytokines content.

ENDOTHELIAL DYSFUNCTION AND GASTROESOPHAGEAL REFLUX DISEASE: STUDY OF COMMON PATHOGENETIC MECHANISMS AND WAYS OF CORRECTION

The aim. To determine the role and place of endothelial dysfunction in the pathogenesis of comorbid gastroesophageal reflux disease (GERD) and obesity by studying the levels of nitric oxide (NO) metabolites in blood and urine. To evaluate the efficacy and benefits of the prescribed therapy, which included the additional inclusion of a peptide compound analogous to leu-enkephalin tyrosine-2-alanine-glycine-phenylalanine-leucyl-arginine diacetate (Dalargin).
 Materials and methods. Clinical manifestations were assessed using the GERD-HRQL questionnaire, levels of stable nitric oxide metabolites NO2 and total metabolites NO2 + NO3 were determined by spectrophotometric method, leptin levels were determined by enzyme-linked immunosorbent assay, pH-metry and motor function was studied by ultrasound. 130 patients were examined, including 70 patients with GERD with comorbid obesity of the first degree, 40 patients with GERD without concomitant pathology and 20 healthy individuals. The study was divided into 3 groups.
 Results. It was determined that the levels of stable metabolites NO2, NO2 + NO3 in blood and urine in the group of GERD with obesity are significantly lower than in the group of isolated GERD (p<0.001). A direct correlation between the level of nitric oxide metabolites in blood and urine and acidity in the stomach and oesophagus was established; an inverse relationship between NO metabolites and the degree of gastrointestinal motor and functional disorders, the severity of clinical manifestations, and the level of hormonal secretion by adipocytes. The supplemental inclusion of Dalargin improved the effectiveness and quality of pathogenetic therapy and achieved a more positive disease dynamics and is recommended for prescription in practice.
 Conclusions. Obesity is a predictor of a more severe course of GERD and more severe endothelial dysfunction. There is a correlation between the severity of endothelial dysfunction and the degree of functional, motor and secretory disorders of the stomach and oesophagus.

The Role of the L-Arginine-Nitric Oxide Molecular Pathway in Autosomal Dominant Polycystic Kidney Disease.

Recently, arginine has been proven to play an important role in ADPKD physiopathology. Arginine auxotrophy in ADPKD induces cell hyperproliferation, blocking the normal differentiation of renal tube cells and causing cyst formation. We explored the L-arginine (Arg)-nitric oxide (NO) molecular pathway in ADPKD, a multisystemic arginine auxotrophe disease. We developed a prospective case-control study that included a group of 62 ADPKD subjects with an estimated filtration rate over 60 mL/min/1.73 mp, 26 subjects with chronic kidney disease with an eGFR > 60 mL/min/1.73 mp, and a group of 37 healthy subjects. The laboratory determinations were the serum level of arginine, the enzymatic activity of arginase 2 and inducible nitric oxide synthase, the serum levels of the stable metabolites of nitric oxide (nitrate, direct nitrite, and total nitrite), and the endogenous inhibitors of nitric oxide synthesis (asymmetric dimethylarginine and symmetric dimethylarginine). In the ADPKD group, the levels of the arginine and nitric oxide metabolites were low, while the levels of the metabolization enzymes were higher compared to the control group. Statistical analysis of the correlations showed a positive association between the serum levels of Arg and the eGFR and a negative association between Arg and albuminuria. ADPKD is a metabolic kidney disease that is auxotrophic for arginine. Exploring arginine reprogramming and L-Arg-NO pathways could be an important element in the understanding of the pathogenesis and progression of ADPKD.

EFFECT OF B. SUBTILIS ІМV B-7724 LECTIN ON THE ACTIVITY OF EFFECTORS OF CELLULAR ANTITUMOR IMMUNITY OF MICE WITH LEWIS LUNG CARCINOMA.

To evaluate the effect of B. subtilis IMV B-7724 lectin on the functional activity of macrophages (Mph), natural killer (NK) cells and cytotoxic lymphocytes (CTL) of mice bearing Lewis lung carcinoma (LLC). The studies were performed on C57Bl/6J mice; LLC was used as an experimental transplantable tumor. The lectin from B. subtilis IMV B-7724 was administered to LLC-bearing mice subcutaneously at a dose of 1 mg/kg of body weight for 10 days. The immunological testing was performed on days 14, 21, and 28 after tumor grafting. The cytotoxic activity of Mph, NK, and CTL was estimated in MTT-assay; the content of the stable metabolites of nitric oxide (NO) was measured by a standard Griess reaction; the arginase activity (Arg) was determined based on the measurement of urea. The administration of the B. subtilis IMV B-7724 lectin to LLC-bearing mice exerted its antitumor and antimetastatic effects partially via a significant (p < 0.05) increase of Mph and NK activities after the completion of the treatment. In the group of animals injected with lectin, the NO/Arg ratio increased significantly, indicating the prevalence of Mph with proinflammatory and antitumor properties. The cytotoxic activity of Mph exceeded the indices of untreated mice and intact control by 1.8 times and 5.3 times respectively; of NK - by 2.8 and 1.3 times respectively. The effect of treatment on the CTL activity was less pronounced. Antitumor and antimetastatic activity of the lectin from B. subtilis IMV B-7724 ensured the preservation of the cytotoxic activity of the main effectors of antitumor immunity (Mph, NK, and CTL) throughout LLC growth.

Effectiveness of rosuvastatin and pulmonary rehabilitation in patients with concurrent course of asthma, chronic obstructive pulmonary disease and diabetes mellitus type 2

The aim of this study was to assess the effectiveness of rosuvastatin and pulmonary rehabilitation in patients with asthma-COPD overlap (ACO) concurrent with type 2 diabetes (T2D).Material and methods. A total of 26 patients with ACO and T2D were examined, with an average age of 61 [55.6; 67.8]. In addition to standard therapy, patients in the main group were prescribed rosuvastatin and a pulmonary rehabilitation program. Treatment efficacy was assessed using questionnaires (CAT, ACQ, SGRQ), dyspnea severity scale (mMRC), BODE index, pulmonary function, bioimpedance analysis, 6-minute walk test, carbohydrate and lipid metabolism status, levels of 8-isoprostane, sCD14, CRP, stable nitric oxide (NO) metabolites - nitrite and nitrate ions, and endothelin-1 in the blood. Results. In the main group, a significant improvement was observed during the treatment course, including a 40% reduction in the BODE index (p&lt;0.05), a 33.4% decrease in dyspnea on the mMRC scale (p&lt;0.05), a 28.5% reduction in CAT, a 40.8% decrease in ACQ, and a 20.6% decrease in SGRQ. Other notable improvements included a 1.3% decrease in BMI, a 13% reduction in body fat percentage, a 23.5% decrease in visceral fat level, a 16% increase in patients' tolerance to physical activity, a 27.5% increase in FEV1 (p&lt;0.05), an 8.1% decrease in fasting blood glucose (p&lt;0.01), a 20% reduction in triglycerides (p&lt;0.05), a 24.9% decrease in LDL cholesterol, and a 27.2% decrease in total cholesterol (p&lt;0.05). Additionally, there was a 23.8% decrease in CRP levels (p&lt;0.05), a two-fold reduction in blood 8-isoprostane levels (p&lt;0.05), a 58% reduction in serum sCD14 levels, a 59.8% increase in stable nitric oxide metabolites (p&lt;0.05), and a 55% decrease in endothelin-1 levels (p&lt;0.05).Conclusions. The use of rosuvastatin and pulmonary rehabilitation significantly improves the quality of life for patients with the concurrent presentation of COPD, asthma, and T2D. It reduces the severity of dyspnea, enhances tolerance to physical activity, improves pulmonary function, lowers visceral fat levels and body fat percentage, enhances lipid profile, and improves endothelial function, all while concurrently reducing oxidative stress and systemic inflammation without worsening carbohydrate metabolism.

The effect of nitric oxide donation on the severity of mitochondrial disfunction to the renal tissue in cardiopulmonary bypass simulation: an experimental study

INTRODUCTION: Acute kidney injury is one of the common complications in cardiosurgical operations with cardiopulmonary bypass (CPB). A number of studies have shown that donation of exogenous nitric oxide (NO) reduces episodes of аcute kidney injury. However, subcellular mechanisms of realization the nephroprotective properties of NO remain unknown. OBJECTIVE: To study the safety of the technology of plasma-chemical synthesis of nitric oxide and to evaluate the effect of the delivery resulting nitric oxide on mitochondrial damage to the renal tissue in the simulation of cardiopulmonary bypass. MATERIALS AND METHODS: Experiment included 12 rams of the Altai breed. Animals were divided into 2 groups: 6 animals were modeled CPB; 6 animals were simulated CPB with NO delivery. Mitochondrial damage was assessed by calcium-binding capacity and transmembrane potential of mitochondria 1 h after weaning from the CPB. The safety of the NO delivery according to the proposed method was assessed by the concentration of nitrogen dioxide on inspiration, the level of methemoglobin. The efficiency of NO delivery according to the proposed method was assessed by the level of stable NO metabolites: endogenous nitrite, nitrate and total concentration of NO metabolites. RESULTS: In the group of animals with NO delivery the average level of transmembrane potential of mitochondria was (171.66 ± 20.41 vs 126.66 ± 18.61; p = 0.00256) and calcium-binding capacity of mitochondria was (1466.66 ± 216.02 vs 866.66 ± 216.02; p = 0.000712) of renal parenchyma. Methemoglobin levels above the recommended thresholds in clinical practice were not recorded in the CPB+NO group. The values of total concentration of NO metabolites and nitrate in the CPB+NO group compared to the CPB group are statistically significantly higher, p = 0.00006; p = 0.0035, respectively. CONCLUSIONS: Plasma-chemical synthesis of nitric oxide is a safe technology, and the use of the resulting nitric oxide in cardiopulmonary bypass leads to a decrease in the severity of mitochondrial dysfunction in the kidney parenchyma.

The effect of a tyrosyl-D-alanyl-glycyl-phenylalanyl-leucyl-arginine diacetate (Dalargin) on oxidative stress in patients with severe combined trauma: a prospective clinical study

INTRODUCTION: Severe combined trauma remains the leading cause of mortality and disability of the workable population. Under damaging factor influence, a whole cascade of pathological processes is triggered, leading to development of multiple organ failure. OBJECTIVE: Exploration of the effects synthetic analogue of tyrosyl-D-alanyl-glycyl-phenylalanyl-leucyl-arginine diacetate (Dalargin) on the dynamics of oxidative stress markers in patients with severe polytrauma and the development of organ dysfunction. MATERIALS AND METHODS: 104 patients with severe combined trauma were included in study. There were 38 patients in the Dalargin group and 66 patients in the control group. Patients from main group received Dalargin in the form of a constant infusion through a syringe dispenser at the dose of 10 mcg/kg/hour at first 12 hours of hospitalization and 5 mcg/kg/hour up to 72 hours from the moment of admission. The control group received standard treatment. Indicators of oxidative stress were evaluated at the time of admission (0 days), 1, 3, 5, 7, 10 and 14 days from the therapy onset. RESULTS: In the main group, there was a significant decrease in oxidative stress markers such as malondialdehyde from the first day of treatment (p &lt; 0.05), normalization of stable nitric oxide metabolites at day 10, and a decrease in total antioxidant activity below normal throughout the observation period. Mortality was comparable in both groups (p &gt; 0.05), but the length of hospital stay was lower in surviving patients in the Dalargin group (p &lt; 0.05). The development of organ dysfunction (acute respiratory distress syndrome, acute kidney injury) was less frequent in the Dalargine group (p &lt; 0.05), but infectious complications (pneumonia, meningitis, wound suppuration) were comparable. CONCLUSIONS: Dalargin leads to a decrease of oxidative stress markers and normalization of endothelial function indicators, which contributes to a decrease of organ dysfunction frequency.

The influence of the degree of activity of rheumatoid arthritis on the parameters of stable metabolites of nitric oxide

Rheumatoid arthritis (RA) is an immunoinflammatory disease characterized by progressive destruction of joints and damage to internal organs, which is based on disturbances in the humoral and cellular immune system [1,2]. In the absence of effective therapy, life expectancy in patients with RA is lower by 3 years in women and 7 years in men, primarily due to the high risk of developing comorbid diseases [5].

The Role of Endothelinergic and Nitroxidergic Reactions in Predicting the Functional Outcome in Patients with Ischemic Stroke of Different Severity

The aim of this study was to assess the value of nitric oxide (NO) and endothelin-1 (ET-1) serum concentrations as potential biomarkers for predicting the functional outcome in patients with acute ischemic stroke. Material and methods. A total of 37 patients diagnosed with ischemic stroke and admitted to a multidisciplinary vascular center were included in the study. The patients were divided into two groups based on the severity of neurological deficits as determined by the National Institutes of Health Stroke Scale (NIHSS): Group 1 consisted of 20 patients with NIHSS scores 15, and Group 2 consisted of 17 patients with NIHSS scores 15. The functional outcome was assessed using the NIHSS absolute values and the degree of disability measured by the Modified Rankin Scale (mRS) by comparing the values before and after baseline treatment. Lab evaluation included quantitative assessment of stable NO and ET-1 metabolites in patient’s serum at admission and on day 10 of hospital stay. The SPSS Statistics V23.0 for Windows software package, Python programming language, and Pandas and SciPy libraries were used for statistical data processing. Results. Group 1 patients demonstrated a statistically significant decrease in NIHSS (P=0.0013) and mRS (P0.0001) scores, which was indicative of a favorable functional outcome. Group 2 patients showed some recovery of only neurological deficit measured by NIHSS scale (P=0.0012), changes in degree of disability by mRS were statistically insignificant. On Day10 of hospital stay, both groups showed a clinically significant increase in ET-1 content, and slight change in NO concentration. NIHSS score demonstrated a significant negative correlation with baseline ET-1 concentrations: R=–0.82, P=0.00023 — in Group 1; R=–0.55, P=0.00075 — in Group 2. Modified RS scores showed negative correlation with NO (R=–0.50, P=0.00044) and ET-1 (R=–1.0, P=0.0074) concentrations in Group 1, and positive correlation with NO (R=0.55, P=0.0023) and ET-1 (R=0.33, P=0.04) concentrations in Group 2. Conclusion. Monitoring of NO and ET-1 serum concentrations provides valuable insights for personalized assessment of the anticipated functional outcome in patients with cerebral ischemia. Further research and the development of prognostic mathematical models are needed to validate the use of endothelial function markers as predictive indicators of patients' recovery potential during the acute phase of ischemic stroke.

#4542 L-ARGININE-NITRIC OXIDE MOLECULAR PATHWAY IN AUTOSOMAL DOMINANT POLYCYSTIC KIDNEY DISEASE

Abstract Background and Aims Autosomal Dominant Polycystic Kidney Disease (ADPKD) is an inherited, complex disease, cystogenesis and phenotypic changes in this disorder being not yet fully understood. Recently, arginine, important for renal cells metabolism, was proved to play an important role in ADPKD physiopathology (1). The inability of cells to recycle or synthesize intracellular arginine through the urea cycle is defined as arginine auxotrophy. Arginine auxotrophy in ADPKD induces cell hyperproliferation, and cysts formation (2). We aimed to explore L-Arginine (Arg) - Nitric Oxide (NO) molecular pathway in ADPKD, a multisystemic, arginine auxotrophe disease. Method We developed a prospective, case control study, in Carol Davila Clinical Hospital of Nephrology, Bucharest, Romania. The study included a group of 62 subjects with ADPKD (mean age -54.3years old, men:women 34:28, with 1A and 1B Mayo ADPKD risk classes) and a group of 37 healthy subjects, similar as sex, mean age. ADPKD diagnosis was based on familial history, clinical exam and CT or MRI scan. We excluded from the study subjects that presented cysts in other organs except the kidney, with eGFR&amp;lt;60mL/min/1.73mp, with history of hematuria, cysts infection, urinary tract infection, renal lithiasis, with unstable blood pressure and hypertensive treatment for less than 6 months; metabolic disorders (carbamoyl phosphate synthase 1 and N-acetyl glutamate synthase deficiencies, lack of ornithine transcarbamilase, hyperargininemia, phenylketonuria). Laboratory tests: serum level of arginine, enzymatic activity of arginase 2 (ARG-2) and nitric oxide inducible synthase (NOS-2), serum levels of stable metabolites of nitric oxide (nitrate, direct nitrite, total nitrite), endogenous inhibitors of nitric oxide synthesis (Asymmetric Dimethylarginine -ADMA, Symmetric Dimethylarginine SDMA). Results In ADPKD patients, the serum levels of arginine and of the stable metabolites of nitric oxide had statistically significant lower levels compared with control group (Table 1). The levels of the principal enzymes that metabolizes arginine – arginase 2 and nitric oxide inducible synthase, respectively the endogenous inhibitors of nitric oxide synthesis were statistically significant higher in ADPKD group when compared with control group (Table 1). The ARG2/Arg, NOS2/Arg, Nitrite/Arg, Nitrate/Arg, ADMA/Arg and SDMA/Arg ratios were statistically significant overexpressed in ADPKD group when compared with control group. Conclusion ADPKD is a metabolic kidney disease, auxotrophic for arginine. The metabolic ADPKD phenotype of renal cells with low risk of progression (1A and 1B Mayo) is defined by the alteration of L-Arginine-NO molecular pathway, the significant reduction of systemic arginine, moderately increased enzymatic activities of ARG2 and NOS2, the reduction of the synthesis and bioactivity of NO. Exploring arginine reprogramming and related molecular L-Arg-NO pathways disturbances could offer more information about ADPKD physiopathology.

Electrochemical measurements of the levels of nitric oxide metabolites in the blood serum

Background: Sepsis is a serious clinical condition caused by a dysregulated immune response to infection resulting in multiple organ failure. In the pathogenesis of sepsis, especially that of septic shock, great importance is given to the endothelial marker of vascular regulation, nitric oxide (NO). In septic shock, dysregulation of the vascular tone plays a key role in the development of hypotension. Therefore, the control of the level of nitric oxide and its stable metabolites in critically ill patients is a very important task. Aim: the aim of this study was to evaluate the potential of the electrochemical nitrite detection in the patients blood serum. Methods: The levels of nitric oxide stable metabolites in the blood serum of healthy individuals (n=20) and septic patients (n=25) were studied by the electrochemical method using a composite electrode and by the spectrophotometric method using the Griess reagent. Results: The data in the groups of healthy people and patients with sepsis differ significantly (p 0.00001) both when measured using electrochemical and spectrophotometric methods. The median value of the current response in healthy people was 0.41 A (0.33; 0.55), and the total content of nitric oxide metabolites (NOx) was 26.8 mol/L (20.8; 31.0), while in patients with sepsis, these values were 0.79 A (0.61; 1.28) and 38.89 mol/L (29.64; 57.45), respectively. A negative correlation was found between the data obtained for practically healthy persons (r=-0.696, p=0.0007). Conclusion: The obtained results allow us to conclude that the nitrite measurement in the blood serum by amperometry using a composite electrode is promising as a diagnostic technique.

NITRIC OXIDE IN BLOOD PLASMA OF WISTAR RATS RECEIVING VITAMIN D3

Recently, much data has been published on the correlation between vitamin D and endothelium. Which is known to regulate vascular homeostasis and hemodynamics. Nitric oxide is characterized by a strong vasodilating effect. It is also a powerful inhibitor of platelet aggregation and adhesion to the vascular wall. Vitamin D and its receptors can regulate the nitric oxide synthesis by changing the activity of endothelial NO synthase.&#x0D; The purpose of the study was to examine the effect of vitamin D3 (emulsion) consumption on the level of nitric oxide in the blood of Wistar rats.&#x0D; Materials and Methods. The study was carried out on mature male Wistar rats weighing 200–300 g (aged 2–3 months). The rats were randomly divided into two groups: 1) control (n=6), kept in vivarium during the whole experiment, 2) experimental (n=6), daily receiving vitamin D3 in emulsion for 30 days. The calculation of vitamin D3 dose was based on the recommended daily amount of vitamin D3 for an adult person (4000 IU). A biochemical blood test determined 25-hydroxyvitamin D, 1,25-dihydroxyvitamin D and the level of stable nitric oxide metabolites. Statistica software was used for statistical analysis.&#x0D; Results. The trial study showed that a 30-day intake of vitamin D3 in emulsion increased its concentration and the nitric oxide level in the blood of rats. It may indicate the intensification of the enzymatic nitric oxide synthesis and the improvement in endothelial function.&#x0D; Conclusion. Thus, vitamin D and nitric oxide are important functionally correlated compounds. Adequate vitamin D status can mitigate the development of cardiovascular disease.

Interrelation between the parameters of endogenous vascular regulation, oxidative stress and the markers of inflammatory response in COVID-19 patients while on extracorporeal membrane oxygenation

Introduction. Extracorporeal membrane oxygenation has found wide application in clinical practice during the COVID-19 pandemic. Oxidative stress, endothelial dysfunction, and systemic inflammatory response syndrome play an important role in the pathogenesis of COVID-19. Our research was designed to study correlations in-between those factors and the impact of extracorporeal membrane oxygenation on them.Aim. The study of systemic inflammatory response and endothelial function in patients with COVID-19 during extracorporeal membrane oxygenation.Material and methods. In the course of a prospective study, we examined 100 COVID-19 patients aged 26 to 75 years, median 55 years [47;60], who were treated at the N.V. Sklifosovsky Research Institute for Emergency Medicine, using extracorporeal membrane oxygenation. As a control group (normal), 25 practically healthy people whose median age was 32 years [25;39] were examined. The function of the vascular endothelium was assessed by the content of nitric oxide stable metabolites in the blood serum and the level of angiotensin-converting enzyme. Next, the ratio of nitric oxide metabolite to angiotensin-converting enzyme level was calculated, reflecting the imbalance between endotheliumdependent vasodilation and vasoconstriction. To assess the severity of oxidative stress in blood serum, malondialdehyde was determined as a marker of lipid peroxidation. The state of the antioxidant system was assessed in terms of total antioxidant status of blood serum. The presence of an imbalance in the system of lipid peroxidation and the antioxidant system total antioxidant status was judged by the oxidative stress coefficient, i.e. the ratio of malondialdehyde to the total antioxidant activity.Results. The analysis showed the presence and progression of endothelial dysfunction, impaired vascular regulation, activation of free radical processes, the presence of an imbalance in the prooxidant/antioxidant system, as well as the progression of the inflammatory process with a decrease in the level of markers of the COVID-19 severity.Conclusion. Further studies of the correlation between endothelial damage and the severity of the systemic inflammatory response syndrome may be of fundamental importance for explaining the pathophysiological mechanisms of COVID-19 course and developing new treatments for such patients.

Metabolic indicators in diagnostics and prediction of course of subclinical and clinical mastitis in goats after parturition

The symptom complex of the inflammatory process in the udder was established in the process of clinical examination in 27.69±1.79 percentage of goats at the beginning of lactation. In the early postpartum period, in sick goats with catarrhal or serous mastitis, a decrease in buffer bases, glucose concentration, and the VH/AcAc coefficient were found. The content of total protein is reduced by 1.22 times, and the level of albumin is reduced by 1.51 times. The indices of AST and ALT, CHF, with catarrhal mastitis are reduced, and the indices of LDH are increased relative to other groups of animals studied, which indicates that the destabilization of metabolite metabolism during the functioning of the liver is included in the pathological process. The level of ceruloplasmin ranged from 7.97 to 141.6 mg / dl, in the blood of goats with clinical mastitis, while with subclinical mastitis from 6.74 to 89.14 mg / dl, and in the control group (clinically healthy) was in range from 9.32 to 46.137 mg/dL. Significant differences were obtained in a positive test for the level of ceruloplasmin and Creactive protein in goats with mastitis. In goats with subclinical mastitis, the level of the studied hormones was within the confidence interval, which allows us to consider hormonal imbalance as a proven cause of subclinical, catarrhal, serous mastitis and the likelihood of hormone dependence of udder inflammation in goats shortly after birth. In animals with subclinical mastitis and with clinical signs of catarrhal or serous mastitis, an increase in the level of diene conjugates by 1.87 times, and the concentration of intermediate products of ketodienes and conjugated triune’s by 1.75 times. By 38.0% of the concentration of stable metabolites of nitric oxide and a decrease of 13.1% in the content of vitamin E. In the blood of progesterone and estradiol, as well as the LPO-AOD systems, have a sufficiently high diagnostic value, allowing monitoring the course of the pathological process in the udder of goats and monitoring the treatment protocol.