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Optimalisation of preparation of biodegradable nanocarriers of drugs
Kvasnicová, Lucia ; Holas, Ondřej (advisor) ; Šnejdrová, Eva (referee)
Charles University, Faculty of Pharmacy in Hradec Králové Department of Pharmaceutical technology Candidate: Mgr. Lucia Kvasnicová Consultant: PharmDr. Ondřej Holas Ph.D. Title of Thesis: Optimising the preparation of biodegradable drug nanocarriers The theoretical part was devoted to different types of nanoparticles, especially those which were prepared from poly(α-hydroxy acids). Other chapters were devoted to methods of their preparation- either from pre- prepared polymers or from directly polymerized monomers and the use of nanoparticles in medicine. The experimental part was aimed at optimizing the preparation of various derivates of poly(lactic-co-glycolic acid) (PLGA) using a nanoprecipitation method with medicated model drug. Rhodamine B was used as a model drug and poloxamer Pluronic® F127 was used as a stabilizer. The size of nanoparticles, their index of polydispersity (PDI) and the zeta potential were measured in the experimental part. Recovery yield, encapsulation efectivity and relative encapslation efectivity were also measured. The results showed that acetone was more suitable solvent than acetonitrile. The most appropriate weight of polymers was 20 mg, when the values of PDI were less than 0,2 and the size of nanoparticles was between 100 nm to 300 nm, so these samples had high...
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Effect of soluble endoglin on bile acids transport in livers
Kvasnicová, Lucia ; Doleželová, Eva (advisor) ; Jirkovský, Eduard (referee)
Lucia Kvasnicová Effect of soluble endoglin on bile acids transport in livers Diploma thesis Charles University in Prague, Faculty of Pharmacy in Hradec Králové Pharmacy Background: Increased plasma levels of soluble form of endoglin (sEng) were observed in patients with hypercholesterolemia, cystic fibrosis associated liver disease, or hepatocellular carcinoma combined with cirrhosis. As there are not available data focused on functional aspects of sEng in the liver, the aim of this diploma thesis was to describe the effect of sEng on the mechanism of bile formation and transport of bile acids in the liver. Methods: In our study were used six months-old transgenic male mice overexpressing human sEng on CBAxC57BL/6J background (sEng) and control mice (n = 8, in each group). Expressions of transport proteins responsible for bile acids homeostasis in the liver at mRNA and protein level were assessed by qRT-PCR and Western blot. Results: High plasma levels of sEng led to decreased plasmatic levels of bile acids. mRNA and protein expression analysis revealed, that this change occurs due to posttranscriptional induction of canalicular transporters, Bsep and Mrp2. Expression of an efflux Mrp4 protein localized at the basolateral membrane of hepatocyte was decreaced, which explains the decreased plasma...
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