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Diagnostična uporabnost serumskega katepsina B pri bolnikih z rakom = Diagnostic application of serum cathepsin B in patients with cancer : diplomska nalogaObermajer, NatašaKatepsin B, lizosomska cisteinska proteaza, je vkljuèena v procese napredovanja malignih bolezni. V tumorjih se poveèa njegovo izrazanje, spremeni se lokalizacija, katepsin B se izloèa v zunajcelièni ... prostor in sodeluje pri razgradnji komponent zunajceliènega matriksa, kar omogoèi tumorsko invazijo, oziljenje in metastaziranje. Rezultati kliniènih studij kazejo, da to molekulo lahko uporabimo v klinièni praksi kot tumorski kazalec, za oceno riziènosti za ponovitev bolezni ali smrt pri rakavih bolnikih. Doloèanje katepsina B v zunajceliènih tekoèinah razsirja uporabo na podroèja diagnoze, spremljanja bolezni in ugotavljanja uèinkovitosti kemoterapije. Z direktnim ELISA testom smo doloèili koncentracijo katepsina Bv serumih bolnikov s pljuènim rakom in z rakom èrevesja ter v kontrolnih skupinah zdravih osebkov in dokazali njegovo uporabnost v diagnostiène namene.V serumih zdravih osebkov celotne populacije smo doloèili statistièno znaèilno (p<0,001) nizje vrednosti katepsina B (povpreèna vrednost 3,2 ngžml,SD 3,6) kot pri kontrolni skupini z mediano starosti 65 let (povpreèna vrednost 5,46 ngžml, SD 1,5), zato smo diagnostièno uporabnost katepsina B doloèali na podlagi vrednosti katepsina B v vzorcih starostno usklajenih osebkov. Diagnostièna uporabnost je veèja pri bolnikih s èrevesnim rakom (AUC vrednost znasa 0,895), ki imajo v povpreèju visje serumske vrednosti katepsinaB, kot pri skupini bolnikov s pljuènim rakom (AUC vrednost znasa 0,667), kjer so serumske koncentracije manj povisane v primerjavi s kontrolno skupino zdravih osebkov. Pri mejni vrednosti 6,96 ngžml smo doloèili obèutljivost testa 44,78% in specifiènost 81,32% za bolnike s pljuènim rakom, medtem ko je za bolnike s èrevesnim rakom obèutljivost testa 84,0% in specifiènost 81,32%. Z uporabo novega substrata TMB-Plus za hrenovo peroksidazo, ki je konjugirana na sekundarno protitelo in omogoèa detekcijo katepsina B pri ELISA testu, smo poskusali znizati mejo detekcije in s tem poveèati diagnostièno specifiènost in obèutljivost. Vendar se je izkazalo, da s tako modificiranim testom izmerjene koncentracije katepsina B niso znaèilno razliène med skupinama bolnikov s pljuènim in èrevesnim rakom ter kontrolno skupino zdravih osebkov in da je nizja meja detekcije posledica nespecifiènega signala.Type of material - undergraduate thesis ; adult, seriousPublication and manufacture - Ljubljana : [Obermajer, N.], 2004Language - slovenianCOBISS.SI-ID - 1556593
Author
Obermajer, Nataša
Other authors
Kos, Janko, 1959-
Topics
cisteinske proteaze |
motnje delovanja |
katepsin B |
metode
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Library | Call number – location, accession no. ... | Copy status |
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Faculty of Pharmacy, Lj. | Knjižnica dp 615 Obermajer Nataša Diagnostična IN: 0007726 |
on loan - outside loan, due date: 19.07.2010
Expected to be available after: 25.07.2024 (1. in queue) |
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Obermajer, Nataša | 25494 |
Kos, Janko, 1959- | 04648 |
Source: Personal bibliographies
and: SICRIS
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