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
The influence of acute diabetes (8 days), induced by streptozotocin (45 mg.kg'1 body weight) on myocardial and renal antioxidative conditions was investigated. The animals were given subtherapeutical doses of insulin (Interdep 6 (J. kg'1 body weight, s.c.). Considerably increased levels of malondialdehyde (MDA), as well as of superoxide dismutase (SOD) and catalase (CAT) activity were found in the myocardium of diabetic animals. The oxidized glutathione (GSSG) level and glutathione peroxidase (GSH-PX) activity remained unchanged. The reduced glutathione (GSH) level as well as the activity of glutathione S-transferase (GST) were significantly lower. The activity of GSH-PX in the kidneys of diabetic rats increased by 60 % and that of GST by 105 %, respectively. CAT and SOD activity values were unchanged.
The aim of our study was to determine the effect of selected cytostatics on a human ovarian cancer cell line A2780 as a model system for ovarian cancer treatment. This cell line is considered cisplatin-sensitive. Panel of tested cytostatics included cisplatin, paclitaxel, carboplatin, gemcitabine, topotecan and etoposide. These cytostatics have a different mechanism of action. To evaluate cytotoxic potential of the tested compounds, the methods measuring various toxicological endpoints were employed including morphological studies, MTT assay, dynamic monitoring of cell proliferation with xCELLigence, cell cycle analysis, caspase 3 activity and expression of proteins involved in cell cycle regulation and cell death. The A270 cell line showed different sensitivity towards the selected cytostatics, the highest cytotoxic effect was associated with paclitaxel and topotecan., Kateřina Caltová, Miroslav Červinka, and Literatura 38
About 30 percent of patients diagnosed with myelodysplastic syndromes (MDS) progress to acute myeloid leukemia (AML). The senescence of bone marrow‐derived mesenchymal stem cells (BMSCs) seems to be one of the determining factors in inducing this drift. Research is continuously looking for new methodologies and technologies that can use bioelectric signals to act on senescence and cell differentiation towards the phenotype of interest. The Radio Electric Asymmetric Conveyer (REAC) technology, aimed at reorganizing the endogenous bioelectric activity, has already shown to be able to determine direct cell reprogramming effects and counteract the senescence mechanisms in stem cells. Aim of the present study was to prove if the anti-senescence results previously obtained in different kind of stem cells with the REAC Tissue optimization – regenerative (TO-RGN) treatment, could also be observed in BMSCs, evaluating cell viability, telomerase activity, p19ARF, P21, P53, and hTERT gene expression. The results show that the REAC TORGN treatment may be a useful tool to counteract the BMSCs senescence which can be the basis of AML drift. Nevertheless, further clinical studies on humans are needed to confirm this hypothesis.
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
Amiodarone seems to exhibit some antiviral activity in the disease caused by SARS-CoV-2. Here we have examined the SARS-CoV-2 disease course in the entire population of the Czech Republic and compared it with the course of the disease in patients treated with amiodarone in two major Prague’s hospitals. In the whole population of the Czech Republic SARSCoV-2 infected 1665070 persons (15.6 %) out of 10694000 (100 %) between 1 April 2020 and 30 June 2021. In the same time period only 35 patients (3.4 %) treated with amiodarone were infected with SARS-CoV-2 virus out of 1032 patients (100 %) who received amiodarone. It appears that amiodarone can prevent SARS-CoV-2 virus infection by multiple mechanisms. In in-vitro experiments it exhibits SARS-CoV-2 virus replication inhibitions. Due to its anti-inflammatory and antioxidant properties, it may have beneficial effect on the complications caused by SARS-CoV-2 as well. Additionally, inorganic iodine released from amiodarone can be converted to hypoiodite (IO- ), which has antiviral and antibacterial activity, and thus can affect the life cycle of the virus.