Xanthine oxidase activity in patients with age-related cataract associated with hypertension

Reactive oxygen species and lipid peroxidation are important factors that contribute to the development of age-related cataract. The study included 130 patients with age-related cataract, 69 of whom were diagnosed with hypertension (HT), 20 with hypertension and type 2 diabetes mellitus (DM), and 41 had no accompanying condition. The following parameters were measured in the serum of the examinees: products of lipid peroxidation malondialdehyde (MDA) and lipofuscin-like fluorophores (LLF), activity of prooxidative enzymes xanthine oxidase (XO) and myeloperoxidase (MPO), antioxidant enzymes superoxide dismutase (SOD) and glutathione peroxidase (GPx), the concentration of thiol groups, and the ferric reducing activity of plasma. The activity of prooxidative enzymes XO and MPO was higher in the plasma of patients with HT (XO=9.0±1.2 U/L; MPO=77.3±8.4 U/L) and with HT and DM (XO=11.9±0.9 U/L; MPO=89.5±5.0 U/L) compared to patients with age-related cataract (XO=6.2±0.9 U/L; MPO=52.4±6.3 U/L; P<0.01). Our research has shown that patients with age-related cataract and hypertension were exposed to increased oxidative damage of biomolecules, based on the increased plasma LLF and MDA content and decreased levels of thiol groups. Oxidative changes of biomolecules in these patients were associated with increased activity of the XO, MPO, and GPx enzymes and a lower extracellular SOD activity and total ferric reductive ability of plasma.

evaluation of the effects of perioperatively administered fluids on ischemia/reperfusion injury

Objective: To investigate the effects of normal saline [0.9% NaCl] and 6% Hydroxyethyl Starch 130/0.4[HES] solution on Ischemia/Reperfusion [I/R] injury in patients undergoing knee arthroscopy operations with spinal anesthesia using a tourniquet

Methods: The study comprised 48 ASA I-II patients undergoing knee arthroscopy with spinal anesthesia using a tourniquet. The patients were randomised into two groups and after standard monitoring two venous lines were introduced to obtain blood samples and to give intravenous therapy. In the control group [Group A] [n=21] 0.9% NaCl, 10 ml/kg/hours and in the study group [Group B] [n=19] 6% Hydroxyethyl Starch 130/0.4, 10 ml/kg/hours infusion were administered. Spinal anesthesia was applied with 12.5 mg hyperbaric bupivacaine to all patients. The tourniquet was applied and the operation was started when the sensorial block level reached T10 dermatome. Blood xanthine oxidase [XO] and malondialdehyde [MDA] levels as an indicator of ischemia and reperfusion injury were measured in samples before fluid infusion [t1], before tourniquet application [t2], 1 minute before tourniquet release [t3], and at 5 [t4] and 15 [t5] minutes after tourniquet release

Results: No difference was observed between the two groups in respect of demographic parameters, the highest block level, duration before tourniquet application and tourniquet duration [p>0.05]. The MDA level after tourniquet application and 15 minutes after tourniquet release was lower in Group B [p<0.05]. XO levels were not different [p>0.05]

Conclusion: In this study 6% Hydroxyethyl Starch 130/0.4 solution reduced MDA level which is an indicator of lipid peroxidation. 6% Hydroxyethyl Starch 130/0.4 solution may be beneficial for Ischemia/reperfusion injuries

Effect of smoking on serum xanthine oxidase and malondialdehyde levels in patients with acute myocardial infarction

To evaluate the effect of smoking on blood levels of xanthine oxidase and malondialdehyde in acute myocardial infarction patients. The cross-sectional study was conducted from June to November 2013 and comprised myocardial infarction in-patients at Liaquat University of Medical and Health Sciences Hospital, Jamshoro, and Isra University Hospital, Hyderabad. Serum samples from age and gender matched smoking and non-smoking patients were investigated for the levels of xanthine oxidase and malondialdehyde by kit methods. Of the 88 serum samples investigated, 68[77.3%] belonged to men and 20[22.7%] to women. Among the 44 smokers, 35[79.5%] were men and 9[20.5%] were women. The overall mean age of the group was 49.6 +/- 8.0 years. Among the 44 non-smokers, 33[75%] were men and 11[25%] women. The overall mean age of the group was 50.9 +/- 8.4 Years. Smokers compared to non-smokers had significantly raised mean serum xanthine oxidase [0.31 +/- 0.05 vs 0.28 +/- 0.03mg/dl; p<0.05] and malondialdehyde [32.29 +/- 3.30 vs 30.30 +/- 2.87 micromol/L; p<0.04] levels. Smokers as against the non-smokers were at higher risk of developing acute myocardial infarction owing to increased level of oxidative stress caused by smoking

Detección temprana de cáncer de mama y cervicouterino en localidades con concentración de población indígena en Morelos / Early detection of breast and cervical cancer among indigenous communities in Morelos, Mexico

Objetivo. Analizar la percepción de mujeres y proveedores de salud sobre cuándo y cómo realizar acciones para la detección temprana del cáncer de mama y cervicouterino en localidades de Morelos con presencia de población indígena. Material y métodos. Se entrevistó a 10 proveedores de salud y 58 usuarias en unidades médicas del primer nivel de atención de cinco localidades; luego se analizó la información con base en el paradigma de la teoría fundamentada. Resultados. El personal de salud está deficientemente familiarizado con los lineamientos oficiales para la detección de cáncer cervicouterino y de mama. Pocos practican sus labores bajo una perspectiva de sensibilización intercultural. Las usuarias tienen nociones imprecisas o equivocadas de las acciones de detección. Conclusiones. La necesidad de capacitación con apego a las normas es evidente. Urge asumir un abordaje con pertinencia cultural que permita la comunicación eficiente y alfabetización en salud para la detección oportuna de estos dos cánceres.

Objective. To analyze the perception in relation to when and how to perform actions for the early detection of breast and cervical cancer among women and health care providers in communities with a high percentage of indigenous population in Morelos, Mexico. Materials and methods. Ten health providers and 58 women users of health services were interviewed which have a first level of attention in five communities. The analysis was developed under the approach of the Grounded Theory. Results. Providers are poorly informed about current regulations and specific clinical indications for the detection of cervical and breast cancer. Few propitiate health literacy under intercultural sensitization. The users have imprecise or wrong notions of the early detection. Conclusions. The need for training in adherence to norms is evident. It is urgent to assume a culturally relevant approach to enable efficient communication and promote health literacy for early detection of these two cancers.

Chelation therapy with desferrioxamine does not normalize ferritin level but attenuates oxidative damage and improves total antioxidant level in malaysian Chinese β-thalassaemia major patients / La terapia de quelación con deferoxamina no normaliza los niveles de ferritinaa pero atenúa el daño oxidativo y mejora el nivel antioxidante total en los pacientes sinomalayos que padecen de talasemia β

Beta-thalassaemia major causes severe anaemia and patients with it may be transfusion-dependent for life. Regular blood transfusions cause iron-overload that leads to oxidative damage which can hasten mortality. The objective of this research was to study the oxidant-antioxidant indices in β-thalassaemia major patients at the University of Malaya Medical Centre (UMMC) who were on desferrioxaminechelation or without chelation therapy. Blood was collected from 39 Chinese patients and 20 controls. Plasma and peripheral blood mononuclear cell lysates (PBMC) were extracted and biochemical tests to evaluate oxidative stress were performed. Oxidative stress was evident in these patients as advanced oxidized protein products (AOPP) and lipid hydroperoxides were elevated, whereas glutathione peroxidase activity and the ferric reducing antioxidant power (FRAP) were reduced. The catalase activity in the patients' PBMC was elevated, possibly as a compensatory mechanism for the reduced glutathione peroxidase activity in both red blood cells and PBMC. The lower FRAP and higher AOPP levels in the non-chelated patients compared with the chelated patients were indicative of a lower oxidative stress level in the chelated patients. The ferritin levels in the chelated and non-chelated patients were high and the mean levels of liver enzyme activities in the majority of patients were elevated regardless of chelation therapy. In conclusion, this study indicates that desferrioxamine chelation therapy does not normalize ferritin level but attenuates oxidative damage and improves total antioxidant level in Malaysian Chinese β-thalassaemia major patients.

La beta-talasemia mayor causa anemia severa, y los pacientes con este padecimiento pueden hacerse dependientes de las transfusiones de sangre por el resto de sus vidas. Las transfusiones regulares de sangre dan lugar a una sobrecarga de hierro que conduce al dano oxidativo, el cual a su vez puede acelerar la mortalidad. El objetivo de esta investigación fue estudiar las tasas de oxidantesantioxidantes en pacientes de beta-talasemia mayor en el Centro Médico de la Universidad de Malaya, tanto aquellos bajo tratamiento de quelación con deferoxamina, como aquellos sin terapia de quelación alguna. Se recogieron muestras de sangre de 39 pacientes chinos y 20 controles. Se extrajeron plasma y lisados de celulas mononucleares perifericas (CMSP), y se realizaron pruebas bioquimicas para evaluar el estrés oxidativo. El estrés oxidativo era evidente en estos pacientes en forma de productos avanzados de oxidación de proteinas (PAOP), y los hidroperoxidos de lipidos eran elevados, en tanto que la actividad de glutatión peroxidasa y el poder reductor ferrico/antioxidante (FRAP) era reducida. La actividad de la catalasa en los pacientes de CMSP era elevada, posiblemente como un mecanismo compensatorio frente a la actividad de glutatión peroxidasa reducida tanto en los globulos rojos como en las CMSP. Los niveles más bajos de FRAP y los más altos de PAOP en los pacientes no quelados en comparación con los pacientes quelados, indicaban un bajo nivel de estrés oxidativo en los pacientes quelados. Los niveles de ferritina tanto en los pacientes quelados como en los no quelados, eran altos, y los niveles promedio de actividades enzimaticas del higado fueron elevados en la mayoria de los pacientes, independientemente de la terapia de quelación. En conclusión, este estudio indica que la terapia de quelación con deferoxamina no normaliza el nivel de ferritina, pero en cambio atenua el daño oxidativo, y mejora el nivel antioxidante total en los pacientes sinomalayos afectados por la betatalasemia mayor.

Determination of serum adenosine deaminase and xanthine oxidase levels in patients with crimean-congo hemorrhagic fever

OBJECTIVE: Crimean-Congo hemorrhagic fever is an acute viral hemorrhagic fever with a high mortality rate. Despite increasing knowledge about hemorrhagic fever viruses, little is known about the pathogenesis of Crimean-Congo hemorrhagic fever. In this study, we measured serum adenosine deaminase and xanthine oxidase levels in Crimean-Congo hemorrhagic fever patients. METHODS: Serum adenosine deaminase levels were measured with a sensitive colorimetric method described by Giusti and xanthine oxidase levels by the method of Worthington in 30 consecutive hospitalized patients (mean age 42.6 ± 21.0). Laboratory tests confirmed their diagnoses of Crimean-Congo hemorrhagic fever. Thirty-five subjects (mean age 42.9 ± 19.1) served as the control group. RESULTS: There was a significant difference in adenosine deaminase and xanthine oxidase levels between cases and controls (p<0.05). However, neither adenosine deaminase nor xanthine oxidase levels varied with the severity of disease in the cases assessed (p>0.05). CONCLUSION: Adenosine deaminase and xanthine oxidase levels were increased in patients with Crimean-Congo hemorrhagic fever. Elevated serum xanthine oxidase activity in patients with Crimean-Congo hemorrhagic fever may be associated with reactive oxygen species generated by the xanthine/xanthine oxidase system during inflammatory responses. In addition, elevated lipid peroxidation may contribute to cell damage and hemorrhage. The association of cell damage and hemorrhage with xanthine oxidase activity should be further investigated in large-scale studies.

role of xanthine oxid and andenosine deaminase in the oxidative stress of rheumatoid arthritis

Rheumatoid arthritis [RA] is an autoimmune connective tissue disease in which chemotaxis and excessive production of cytokines and reactive oxygen species [ROS] are characteristics of activated cytokines that play an important role in the generation of ROS in RA. Xanthine oxidase [XO] and adenosine deaminase [ADA] enzymes were reported to act as sources of ROS and advanced oxidation protein products [AOFP] was found to be a good marker of oxidative stress. To find out if XO or ADA has any role in the pathogenesis of RA; and to correlate their activities with a novel marker of oxidative stress, other cytokines, and markers of disease activities.: this study was carried out on 10 patients with RA [group I] and 10 healthy persons as a control group, [group II]. The levels of XO activity, ADA activity, AOPP, interleukin-6 [IL-6], interleukin-8 [JL-8], erythrocyte sedimentation rate [ESR] and C-reactive protein [CRP] were estimated. XO activity, A OFF, IL-6, IL-8, ESR and CRF levels were all increased significantly in group I. Also XO and AOPP were found to have positive correlation to each other and to the acute phase reactants ESR and CRP. ADA activity showed no significant changes comparing the two studied groups. XO could be considered an important source of ROS in RA patients. XO and AOFP play at least a partial role in the pathogenesis of the disease and their levels could be used as one of the laboratory markers of the RA activity. On the other hand, ADA had no role in RA pathogenesis. It is suggested that the use of xanthine oxidase inhibitors as well as other antioxidants may be of benefit in preventing tissue damage in RA patients

Early clinical and angiographic outcome of coronary stenting in thrombus-containing lesions

Percutaneous coronary intervention [PCI] and coronary stenting of thrombus-containing lesions have frequently been associated with an increased risk of adverse outcome. However, the strength of this association has varied and with the new antiplatelet agents and stents, it is not clear whether thrombus is still a risk factor after PCi. The study evaluated the early [in-hospital] clinical and angiographic outcomes of patients undergoing coronary stenting in lesions with angiographic evidence of intracoronary thrombus, A retrospective study comparing two groups of patients: Group I included 64 patients who undetwent stent implantation in a single thrombus containing lesion, Group II included 293 patients who underwent stent implantation in a single non-thrombus containing lesion during the same time period [between June 1997 and April 2001]. Both groups were matched as regards the baseline clinical characteristics except that significantly more patients of group I were presented by unstable angina compared with group II: 65.08% versus 47.78% [P<0.01]. Patients with thrombus [Group I] have significantly more RCA as the target vessel; 46.03% vs 30.03% [P<0.01] and significantly more complex lesion morphology; 42.86% vs 26.28% [P<005] compared with patients without thrombus [Group II]. The target vessel size and the baseline percent diameter stenosis were significantly higher In group I than group II [P<0.001 and P<0.01 respectively]. Similarly the largest balloon diameter and the mean number of inflations were significantly higher in group 1 than group II [P<0.001 and P<0.001 respectively]. Significantly more patients in group I received the GPIIb/I1Ia antagonist, tirofiban [Aggrastat] than group Ii; 20.63% vs 4.10% [P<0.001] although its use was rather limited in both groups. The angiographic success was almost identical for both groups 95.24% in group I vs 96.25% in group II. There were no statistically significant differences between both groups regarding all parameters of in-hospital outcomes, However, there was a trend towards more adverse events in group I compared to group II that did not reach statistical significance [Death: 1.59% vs 0.34%, Q-Mi: 3.17% vs 1.71%, Acute closure: 4.76% vs 2.05%, Repeat PCI: 4.76% vs 2.38%, Emergency CABG: 0% vs 0%, and Procedural success: 88.8% vs 94.28%]. Coronary stenting can be safely performed in patients with thrombus-containing lesions with excellent angiographic outcome and acceptable, though less favorable in-hospital clinical outcome

Molybdenum, xanthine oxidase and riboflavin levels in tamoxifen treated postmenopausal women with breast cancer.

40 cases postmenopausal women with breast cancer constituted the study group and 20 sex and age matched formed the control group. The study group of untreated patients showed nonsignificant decrease in molybdenum but significant decrease in blood xanthine oxidase and riboflavin levels. Tamoxifen treated patients showed nonsignificant increase in molybdenum, after 3 months, significant increase after 6 months and significant increase in xanthine oxidase and riboflavin levels. Thus tamoxifen when given in breast cancer helps in amelioration of the diseased condition.

Atividade de xantina-oxidase na carcinogênese induzida pela 1.2-dimetil-hidrazina / Xantina-Oxidase activity in carcinogenesis induced by 1,2-dimethylhydrazine

A 1,2-dimetil-hidrazina (DMH) induz a formaçäo de tumores no intestino de ratos após aplicaçöes semanais durante 20 semanas. As atividades de xantina-oxidase (XO) e xantina-desidrogenase (XD) variam de acordo com a distância ao longo do intestino. Nos animais injetados com DMH verifiou-se uma diminuiçäo da atividade enzimática exatamente na porçäo onde ocorre maior incidência tumoral. Anotou-se, também, um aumento da atividade XD em soro sangüíneo de ratos tratados com DMH