354 research outputs found
Mikrocirkuláció vizsgálata gasztrointesztinális sebészetben = Investigation of microcirculation in gastrointestinal surgery
I. Kimutattuk, hogy a gyomorcsövesĂtĂ©s károsĂtja a csĹ‘gyomor cranialis harmadának vĂ©rellátását. Igazoltuk, hogy a thoracalis epidurális anaesthesia (TEA) fokozza a vasculárisan károsodott csĹ‘gyomor proximális harmadának mikrocirkuláciĂłját, egyben javĂtja a szöveti oxigenizáciĂłt Ă©s a belek motilitását is. MegfigyelĂ©seink alapján javasoljuk a TEA rutinszerű klinikai alkalmazását a nyelĹ‘csĹ‘-sebĂ©szeti gyakorlatban. II. KĂsĂ©rletes mechanikus icterus sĂşlyos mikrocirkuláciĂłs károsodáshoz vezet Ă©s fokozza a bacteriális endotoxin (LPS) okozta mikrokeringĂ©si károsodásokat Ă©s jelentĹ‘sen emeli a Kupffer sejtek aktiválĂłdását. Az obstructios icterusban fokozĂłdik az LPS okozta Kupffer sejt aktivitás Ă©s mikrokeringĂ©si károsodások is. A Kupffer sejt blokád jelentĹ‘sen javĂtotta az LPS indukálta gyulladásos válaszreakciĂłt Ă©s csökkentette a máj mikrokeringĂ©si Ă©s szöveti károsodását is. A phosphatidylcholinban (PC) gazdag táp adása kedvezĹ‘en befolyásolja obstructios icterusban az endotoxaemia okozta lokális/szisztĂ©más gyulladásos reakciĂłkat, a perfĂşziĂłs valamint szöveti károsodást. EredmĂ©nyeink bizonyĂtják, hogy a Kupffer sejt gátlás mĂłdszere Ă©s a PC diĂ©ta megfelelĹ‘ terápiás lehetĹ‘sĂ©get nyĂşjthat a cholestasis okozta gyulladásos szövĹ‘dmĂ©nyekkel szemben. III. Vizsgálataink igazolták, hogy a glĂĽkokortikoidok lĂ©nyeges szerepet játszanak a heveny pancreatitis által elĹ‘idĂ©zett gyulladásos válaszreakciĂł kontrolljában Ă©s az extrapancreatikus szervek (tĂĽdĹ‘, máj) károsodásainak mĂ©rsĂ©klĂ©sĂ©ben. | I. Our results proved that gastroplasty dramatically impairs the blood flow in the cranial part of the gastric roll, while thoracic epidural anesthesia (TEA) significantly improves the microcirculation of the distal portion of the gastric tube and increases the intestinal motility after a gastric pull-up. These findings indicate that TEA is favorable and should be recommended during reconstructive esophageal surgery. II. Obstructive jaundice causes a severe perfusion failure with a moderate leukocyte reaction in the liver, and enhances both the bacterial endotoxin lipopolysaccharide-induced microcirculatory failure and the increased Kupffer cell activity. Kupffer cell blockade by GdCl3 reduces the microcirculatory consequences of endotoxemia, and beneficially influences the inflammatory reactions of obstructive jaundice combined with the lipopolysaccharide challenge. In experimental obstructive jaundice, the dietary phosphatidylcholine (PC) supplementation significantly ameliorates the local and systemic inflammatory reactions, perfusion failure and liver damage caused by endotoxemia. These data suggest a potential therapeutic benefit of PC supplementation to mitigate the harmful consequences of the inflammatory complications of cholestasis. III. The glucocorticoids mitigate progression of the inflammatory reaction and extrapancreatic organs (liver, lung) injuries during the early phase of acute pancreatitis
Kupffer sejt blokád jelentősége normál és kóros immunválasztásban = The role of Kupffer cell blockade in health and disease
Kimutattuk, hogy a májba transzplantált xenograft tĂşlĂ©lĂ©se meghosszabbĂthatĂł. HasonlĂłkĂ©ppen kimutattuk, hogy a Kupffer sejtek működĂ©sĂ©nek gátlása növeli a birkavörösvĂ©rtestekkel kiváltott humorális immunválaszt, mely 51-krĂłmizotĂłppal jelölt idegen vörösvĂ©rtestekkel vĂ©gzett vizsgálataink szerint arra vezethetĹ‘ vissza, hogy a Kupffer sejt blokád hatására az antigĂ©n tĂşlfolyik a májon Ă©s az immunválasz szempontjábĂłl fontos extrahepatikus szervekben, Ăgy a lĂ©pben kerĂĽl felvĂ©telre. Azonban a makrofágok nemcsak a szervezet vĂ©dekezĂ©sĂ©ben Ă©s az immunválasz szabályozásában játszanak fontos szerepet, hanem tĂşlzott aktiválodásuk Ă©s a sejtpusztĂtĂł, immunszuppressziĂłt kiváltĂł mediátorok fokozott felszabadulása hozzájárulhat a szervek működĂ©sĂ©nek összeomlásához Ă©s sĂşlyos sokkállapotokban a többszervi elĂ©gtelensĂ©g kialakulásához. Kimutattuk, hogy a gadolĂnium kloriddal kiváltott Kupffer sejt blokád mĂ©rsĂ©kli, az antiglĂĽkokortikoid RU 38486 sĂşlyosbĂtja a kĂsĂ©rletesen lĂ©trehozott biliaris obstrukciĂłban szenvedĹ‘ állatok endotoxin Ă©rzĂ©kenysĂ©gĂ©t Ă©s az endotoxinnal kiváltott citokin felszabadulást. Folyamatban lĂ©vĹ‘ kĂsĂ©rleteink szerint a krĂłnikusan adagolt gadolĂnium klorid gátolja a biliaris cirrhosis kialakulását. Vizsgálatainkban jelentĹ‘s szinergizmust találtunk a bakteriális endotoxin Ă©s az adenovĂrus fertĹ‘zĂ©s között. A vĂrusfertĹ‘zĂ©s Ă©s endotoxin hatására kialakult tĂşlaktivált gyulladásos válaszreakciĂł eredmĂ©nyezi az endotoxin lethalis hatásának fokozĂłdását | The gadolinium chloride (GdCl3)-iduced Kupffer cell blockade prolongs the rejection of discordant xenograft transplanted into the liver. Kupffer cell phagocytosis blockade was also found to increase the humoral immune response to sheep red blood cells.The augmentation of the humoral immune response in GdCl3-pretreated animals is a consequence of the spillover of the antigen from the liver into the spleen and other extrahepatic reticuloendothelials organs, which are important in the immune response. However, macrophages not only act as a first line of defence and have pivotal roles in regulating the immune response, but also the over-activatin of macrophages and the excessive release of macrophage-derived destructive and immunosuppressive products may contribute to organ damage and the develoment of ?multiple organ failure? in severe stress and injurues such as shock states. It has been shown that the GdCl3-iduced Kupffer cell blockade decreases and the antiglucocorticoid RU 38486 increases the endotoxin-induced mortality and cytokine liberation in experimental bile ligated rats. Our experiments show that the GdCl3 inhibits the development of biliary fibrosis/cirrhosis. We observed a remarkable synergism of adenoviruses and lipopysacchaide (LPS) in triggering the production of tumor necrosis factor alpha. The over-activation of inflammatory responses may explain the augmentation of the lethal effect of LPS in mice pre-exposed to adenoviruse
Iron oxyhydroxide aerogels and xerogels by controlled hydrolysis of FeCl3[middle dot]6H2O in organic solvents: stages of formation
Iron oxyhydroxide aerogels and xerogels were prepared by controlled hydrolysis of FeCl3[middle dot]6H2O in organic solvents by using a limited amount of water or consuming solely water molecules available from the crystals. Ethanol, ethylene glycol, dimethyl sulfoxide (DMSO) and dimethyl formamide (DMFA) solvents were used, the hydrolysis was promoted with epichlorohydrin proton scavanger. High surface area aerogels were prepared by supercritical CO2 extraction of solvents, surface area and pore distribution measurements were performed on them. Aerogel and xerogel samples were characterized by XRD, Mossbauer spectroscopy and HRTEM methods. The process of hydrolysis was followed by recording Mossbauer spectra of frozen reaction mixtures. Stepwise progress and appearance of transient components were detected in DMSO and DMFA solvents. Aerogel samples exhibit asymmetric spectra with low probability of Mossbauer effect in their as synthesized state. In contrast, frozen reaction mixtures, gels, dry xerogels and compressed aerogels display symmetric spectra with high probability of the Mossbauer resonance. XRD proves the dominant presence of 2-line ferrihydrite. HRTEM studies reveal 4-8 nm typical particle sizes with 0.21-1.0 nm characteristic lattice distances. Different types of coordination environments are distinguished for iron in the formed ferrihydrite nanoparticles due to structural features and imperfections
- …