The purpose of this study was to determine the effect of a 15-week omega-3 rich diet on age-related differences in myocardial antioxidant defense and inflammation. 20 mature (M) (6 mo.) and 20 old (O) (15 mo.) male Fisher 344 rats were assigned to two diet groups: Control (CON) or Fish Oil (FO). Following the diet, animals were sacrificed and left ventricular (LV) heart tissue was harvested for biochemical assays and western blot analysis. No differences were observed in expression of LV interleukin-6 (IL-6) and tumor necrosis factor-α as well as hydrogen peroxide (H2O2) production between MCON and OCON. However, LV catalase protein expression and activity were increased in OCON vs. MCON and accompanied by increased expression of superoxide dismutase (SOD)-1. In contrast, LV IL-6 was lower in MFO vs. old rats, and LV H2O2 was decreased in MFO and OFO relative to respective control groups. Protein expression and activity of LV catalase and SOD-1 expression were increased in OFO similarly to OCON, but LV SOD activity was also increased in OFO vs. mature rats. In summary, FO supplementation increased myocardial antioxidant defense in all animals and augmented age-associated increases in antioxidant capacity in the absence of changes in inflammation., S. Lennon-Edwards, T. A. Schellhardt, J. M. Kuczmarski., and Obsahuje bibliografii
Hyperglycemia is known to cause oxidative stress that leads mainly to enhanced production of mitochondrial reactive oxygen species (ROS). It has been demonstrated that hyperbaric oxygen (HBO) treatment also increases the formation of ROS. There are, however, no comprehensive evaluations of such oxidative effects in diabetes which requires HBO treatment. The purpose of this study is to investigate the influence of a clinically-recommended HBO treatment on glucose homeostasis and oxidative stress in rats with streptozotocin (STZ)-induced diabetes. Under the clinically-used HBO exposure protocol, the levels of blood glucose, thiobarbituric acid reactive substances (TBARS) as a lipid peroxidation marker, and the activity of superoxide dismutase (SOD) as an antioxidant enzyme marker were investigated in the erythrocytes, liver, pancreas, skeletal muscle, and brain of rats with STZ-induced diabetes. The levels of blood glucose and TBARS increased significantly (p<0.05), and the activity of SOD decreased significantly (p<0.05) in the erythrocytes and all organs of rats with diabetes subjected to HBO exposure. These results suggested that HBO exposure might boost glucose autoxidation and increase ROS production in STZ-induced diabetes as side-effects of administering HBO treatment for the first time., T. Matsunami ... [et al.]., and Obsahuje bibliografii a bibliografické odkazy
Plant-based n-3 polyunsaturated fatty acids (PUFA) possess a prospective antiatherogenic potential. Currant oil from Ribes nigrum L. is one of the few plant oils containing PUFAn-3 (15.3 mol%) in addition to PUFAn-6 (60.5 mol%). This study was aimed at comparing the effects of currant oil with those of lard fat, rich in saturated (43.8 mol%) and monounsaturated (47.0 mol%) fatty acids, on antioxidant parameters, the lipoprotein profile and liver lipids in rats fed on 1 % (w/w) cholesterol diets containing either 10 % of currant oil (COD) or lard fat (LFD). After 3 weeks of feeding, the COD induced a significant decrease in blood glutathione (GSH) and an increase in Cu2+ induced oxidizability of serum lipids, but did not affect liver GSH and t-butyl hydroperoxide-induced lipoperoxidation of liver microsomes. Although the COD did not cause accumulation of liver triacylglycerols as LFD, the lipoprotein profile (VLDL, LDL, HDL) was not significantly improved after COD. The consumption of PUFAn-3 was reflected in LDL as an increase in eicosapentaenoic and docosahexaenoic acid. These results suggest that currant oil affects positively the lipid metabolism in the liver, above all it does not cause the development of a fatty liver. However, adverse effects of currant oil on the antioxidant status in the blood still remain of concern., R. Večeřa, N. Škottová, P. Váňa, L. Kazdová, Z. Chmela, Z. Švagera, D. Walterová, J. Ulrichová, V. Šimánek., and Obsahuje bibliografii
The consequences of increased oxidative stress, measured as the level of malondialdehyde (MDA) during ischemia/reperfusion, were studied in 48 patients in the acute phase of myocardial infarction (AMI) and a control group (21 blood donors). The serum levels of a-tocopherol and b-carotene were followed. Immediately after the treatment onset the level of a-tocopherol started to decrease, reaching a plateau after 24 h. The consumption of b-carotene was delayed by 90 min. Steady decline was detected during the whole time interval studied (48 h). Glutathione peroxidase (GPx) activity, as a representative of antioxidant enzymes, was estimated in whole blood. The influx of oxygenated blood was accompanied by a stimulation of GPx activity, which reached its maximum at the time of completed reperfusion. When comparing the AMI patients with the control group, the levels of MDA were found significantly increased, which indicates that oxidative stress is already increased during ischemia. Lower antioxidant levels found in the patients might either already be the result of vitamin consumption during ischemia or be a manifestation of their susceptibility to AMI. Monitored consumption of a-tocopherol and b-carotene during reperfusion indicated that in the case of patients, whose level of antioxidant vitamins is below the threshold limit, a further substantial decrease of antioxidant vitamins during reperfusion could enhance the oxidative damage of the myocardium., V. Mužáková, R. Kanďár, P. Vojtíšek, J. Skalický, R. Vaňková, A. Čegan, Z. Červinková., and Obsahuje bibliografii
Experimental data on the effect of nicotine on cerebral microvessel thrombosis is lacking. Therefore, this study was carried out to elucidate the effects of nicotine on platelet aggregation in cerebral (pial) microcirculation of the mouse, and the possible protective effect of vitamins C and E. Male TO mice were divided into six groups, and injected i.p. with saline as a control, nicotine (1 mg/kg), vi tamin C alone (100 mg/kg), vitamin E alone (100 mg/kg), nicotine plus vitamin C or nicotine plus vitamin E, all for one week before the experiment. After one week, platelet aggregation in ce rebral microvessels of these groups of mice were studied in vivo . The appearance of the first platelet aggregation and total blood flow stop in arterioles and venules were timed in seconds. In the animals treated with nicotine, venules did not show any alteration in the platelet aggregation time in comparison to the control animals. However, in arterioles platelet aggreg ation time was significantly accelerated (p<0.001) in nicotine-treated animals as compared to controls. Both vitamins C and E prevented the shortening of arteriolar platelet aggregation ti me significantly (p<0.001) when applied with nicotine but not alone. It can be concluded that nicotine enhances the susceptibility to thrombosis in the cerebral arterioles in vivo and that vitamins C and E have alleviating effect on nicotine-induced thrombotic events in mice pial microvessels., M. A. Fahim ... [et al.]., and Obsahuje bibliografii a bibliografické odkazy
Literature data support that green tea and its major component epigallocatechin gallate (EGCG) have powerful antioxidant effects. Contrary, hepatotoxicity can be induced by high-dose EGCG. The timing of exposure to green tea in relation to administration of hepatotoxic agent plays an import role too. The aim of our work was a verification of antioxidative effect of EGCG on D-galactosamine-induced injury in primary culture of rat hepatocytes. Hepatocytes were incubated with EGCG at concentrations of 1.25-10 μM and toxic D-galactosamine (GalN) for 24 hrs. Alternatively, hepatocytes were pretreated with EGCG for 24 hrs, and then incubated with EGCG and GalN for further 24 hrs. Cytotoxicity was analysed by lactate dehydrogenase activity, functional capacity by albumin production. Oxidative stress was evaluated from a production of malondialdehyde and glutathione content in the cells. EGCG protected hepatocytes against GalN-induced cytotoxicity but preventive treatment of intact hepatocytes with EGCG was required to diminish the development of hepatocyte injury. Oxidative stress induced in our study seems to overcome the ability of hepatocytes to improve GSH depletion and albumin production. Prolongation of the pretreatment with EGCG could be a promising strategy leading to amelioration of its hepatoprotective effect. and Alena Moravcová, Zuzana Červinková, Otto Kučera, Vojtěch Mezera, Halka Lotková
Úvod: Incidence akutního krvácení do horní části gastrointestinálního traktu (GIT) se udává 85–108/100 000 obyvatel za rok, přičemž nonvariceální krvácení odpovídá za 80–90 %. Antiagregační a antikoagulační terapie patří mezi významné rizikové faktory pro krvácení do horní části GIT. Cíl práce: Zjistit výskyt krvácení do horní části GIT u běžné populace pacientů v podmínkách krajské nemocnice, srovnání podílu antiagregancií, antikoagulancií a dalších rizikových léků na dané problematice. Soubor a metodika: Retrospektivní analýza pacientů, kteří v roce 2013 (leden–červen) podstoupili za hospitalizace gastroskopii pro akutní krvácení do horní části GIT nebo pro anémii (Hb < 100 g/l) s verifikovaným zdrojem ztrát v horní části GIT. Výsledky: Soubor tvořilo 111 pacientů s průměrným věkem 69 ? 15 let, mužů bylo 60 %. Nonvariceální krvácení tvořilo 90 %. Žádný z pacientů s variceálním krvácením (10 % pacientů) neužíval antiagregační či antikoagulační terapii. Pacientů s nonvariceálním krvácením do horní části GIT bylo 100 s průměrným věkem 70 ? 15 let, 61 % mužů. Příznaky akutního krvácení (hemateméza, meléna) mělo 73 % těchto pacientů. Nejčastější příčinou krvácení byla vředová choroba gastroduodena, a to v 54 % případů. Ze všech pacientů s nonvariceálním krvácením do GIT užívalo antiagregancia 32 %, antikoagulancia 19 %, dalších 10 % pacientů užívalo nesteroidní antirevmatika, selektivní inhibitory zpětného vychytávání serotoninu nebo kortikoidy. 30denní mortalita pacientů s nonvariceálním krvácením byla 11 % a roční mortalita 23 %. Nebyl zjištěn významný rozdíl v mortalitě, nutnosti aplikace krevních transfuzí nebo chirurgické intervence u pacientů na antitrombotické terapii a bez ní. 25 % (8 pacientů) s terapií kyselinou acetylsalicylovou (ASA) nebylo k této léčbě indikováno dle guidelines. Závěr: V souboru pacientů ošetřených gastroskopií pro symptomatické nonvariceální krvácení do GIT nebo anémií (Hb < 100 g/l) je signifikantně větší podíl léčených antiagregancii než antikoagulancii. To může reflektovat větší zastoupení této léčby v populaci, ale také její vyšší riziko pro vznik GIT krvácení. V souvislosti s tím vyznívá varovně fakt, že stále existuje nezanedbatelné procento pacientů, kteří užívají kyselinu acetylsalicylovou i přesto, že nesplňují indikaci k této terapii., Background: The incidence of acute upper gastrointestinal bleeding is about 85–108/100,000 inhabitants per year, nonvariceal bleeding accounts for 80–90 %. Antiplatelet and anticoagulation treatment are the significant risk factors for upper gastrointestinal bleeding. Objectives: To evaluate the occurrence of upper gastrointestinal bleeding in the general community of patients in a county hospital. And to compare the role played by antiplatelet and anticoagulation drugs and other risk medication. Design and methods: Retrospective analysis of patients over 18 years of age who underwent endoscopy for acute upper gastrointestinal bleeding or anaemia (haemoglobin < 100 g/l) with proved source of blood losses in upper gastrointestinal tract during a hospital stay in 2013 (from January to June). Results: We included 111 patients of average age 69 ? 15 years, men 60 %. Nonvariceal bleeding accounted for 90 % of the cases. None of the patients with variceal bleeding (10 % of patients) took antiplatelet or anticoagulation therapy. There were 100 patients with nonvariceal bleeding of average age 70 ? 15, 61 % men. With the symptoms of acute bleeding (hematemesis, melena) presented in 73 % of patients. The most frequent cause of bleeding was gastric and duodenal ulcer (54 %). 32 % of patients with nonvariceal bleeding had antiplatelets, 19 % anticoagulants and 10 % used nonsteroidal anti-inflammatory drugs, selective serotonin reuptake inhibitors or corticosteroids. 30-days mortality of patients with nonvariceal bleeding was 11 %, annual mortality was 23 %. There was no significant difference in mortality, blood transfusion requirements or surgical intervention between the patients with antithrombotic agents and without them. 25 % of patients (8 patients) using acetylsalicylic acid did not fulfil the indication for this treatment. Conclusion: Among the patients examined by endoscopy for symptomatic nonvariceal bleeding and/or anaemia (haemoglobin < 100 g/l) significantly higher portions of patients are taking antiplatelet rather than anticoagulation therapy. This may be caused by greater use of these drugs in the population, but on the other hand it may reflect an association with greater risk of gastrointestinal bleeding. With regard to that, it is alarming, that there still exists a nonnegligible percentage of patients taking acetylsalicylic acid even though they do not meet the indication for the prescription according to the guidelines., and Veronika Belanová, Martin Gřiva
Zůstává-li dnes architekt Antonín Balšánek v širším povědomí, pak jen jako spoluautor pražského Obecního domu. Byl ovšem také významným urbanistou a teoretikem. Příznačně pro přelom století přechází jeho tvorba od pozdní novorenesance a novobaroka k secesnímu tvarosloví. and Jan Boháček.