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Title:Razvoj afinitetne kromatografije s proteinom a za določanje stopnje oksidacije terapevtskih monoklonskih protiteles razreda IgG1, IgG2 in IgG4 : magistrsko delo
Authors:ID Smerkolj, Janez (Author)
ID Pečar, Darja (Mentor) More about this mentor... New window
ID Islamčević Razboršek, Maša (Comentor)
Files:.pdf MAG_Smerkolj_Janez_2021.pdf (2,75 MB)
MD5: 2C1FA4B462D8AA870A9287EFF54D00B1
PID: 20.500.12556/dkum/24f68ff7-2c8e-4ff5-a7dc-30672a404c2f
 
Language:Slovenian
Work type:Master's thesis/paper
Typology:2.09 - Master's Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:Razvoj in proizvodnja bioloških zdravil vztrajno naraščata. Največji delež med njimi predstavljajo rekombinantna monoklonska protitelesa, ki so tekom razvoja, izdelave in shranjevanja podvržena neželenim procesom razgradnje. Oksidacija je ena izmed glavnih degradacijskih poti. Katalizirajo jo prisotnost kovinskih ionov, nečistoče v farmacevtskih oblikah, svetloba in povišana temperatura. Za oksidacijo so med vsemi aminokislinami najbolj dovzetni površinsko izpostavljeni metioninski ostanki. Prisotnost oksidiranih metioninskih ostankov pri terapevtskih monoklonskih protitelesih vpliva na strukturo proteina in s tem na življensko dobo protitelesa v serumu, biološko funkcijo in imunogenost. Zato je določanje oksidacije metionina pri monoklonskih protitelesih pomemben del med biofarmacevtskim razvojem. Določanje oksidacije metionina se večinoma izvaja s peptidnim kartiranjem, kjer protein encimsko razgradimo na krajše peptidne fragmente, ki jih ločimo s tekočinsko kromatografijo visoke ločljivosti in detektiramo z masno spektrometrijo ali UV detekcijo. Razvoj in izvajanje teh analitskih metod je časovno zamudno in tehnično zahtevno. Protein A afinitetna kromatografija se je izkazala kot alternativna metoda pri določanju stopnje oksidacije monoklonskih protiteles. Imunoglobulini G vsebujejo v konstantnem področju površinsko izpostavljena metionina, dovzetna za oksidacijo. Nahajata se v stični površini CH2 in CH3 domene, blizu vezavnega mesta imunoglobulina na protein A. Oksidacija teh dveh metionininov zmanjša afiniteto vezave imunoglobulina na protein A in predstavlja princip ločbe oksidiranih od neoksidiranih vrst imunoglobulinov s pomočjo afinitetne kromatografije. V okviru magistrskega dela smo uporabili afinitetno kromatografijo s proteinom A za spremljanje oksidacijskih stopenj imunoglobulinov razredov IgG1, IgG2 in IgG4. Dosegli smo željeno ločbo oksidiranih imunoglobulinov G od neoksidiranih in na podlagi ločbe razvili ustrezno analitsko metodo za določanje stopnje oksidacije monoklonskih protiteles. Z novo analitsko metodo lahko hitro in enostavno določimo stopnjo oksidacije za imunoglobuline IgG1, IgG2 in IgG4 razreda. Rezultati, pridobljeni z novo afinitetno kromatografsko metodo, so primerljivi z referenčno metodo peptidnega kartiranja. Prav tako lahko novo analitsko metodo uporabimo za analizo različnih imunoglobulinov G, brez predhodne spremembe kromatografskih pogojev.
Keywords:Imunoglobulin G, monoklonsko protitelo, oksidacija, metionin, proteina A, afinitetna kromatografija
Place of publishing:Maribor
Place of performance:Maribor
Publisher:[J. Smerkolj]
Year of publishing:2021
Number of pages:XI, 49 str.
PID:20.500.12556/DKUM-79948 New window
UDC:543.544:616-097.3(043.2)
COBISS.SI-ID:74785027 New window
Publication date in DKUM:31.08.2021
Views:1426
Downloads:106
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FKKT
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Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:24.08.2021

Secondary language

Language:English
Title:Development of protein a affinity chromatography for determining the oxidation rate of therapeutic monoclonal antibodies of IgG1, IgG2 in IgG4
Abstract:The development and production of biological therapeutics is steadily increasing. The largest share among all biological therapeutics are recombinant monoclonal antibodies, which are subjected to unwanted degradation processes during development, production and storage. Oxidation is one of the major degradation pathways. It is catalyzed by the presence of metal ions, impurities in the formulations, light and elevated temperature. Of all the amino acids, surface-exposed methionine residues are the most susceptible to oxidation. The presence of oxidized methionine residues in therapeutic monoclonal antibodies affects the structure of the protein and thus the lifetime of the antibody in serum, biological function and immunogenicity. Therefore, the determination of methionine oxidation in monoclonal antibodies is an important part during biopharmaceutical development. Determination of methionine oxidation is currently performed by peptide mapping, where the protein is enzymatically degraded to shorter peptides, which are separated by high-performance liquid chromatography and detected by mass spectrometry or UV detection. The development and implementation of these analytical methods is time consuming and technically demanding. Protein A affinity chromatography has proven to be an alternative method in determining the oxidation rate of monoclonal antibodies. The constant domain of immunoglobulins G contain surface-exposed methionines, susceptible to oxidation. They are located in the vacinity of the CH2 and CH3 domains, near the binding site of immunoglobulins to protein A. Oxidation of these two methionine reduces the binding affinity of immunoglobulins for protein A and represents the principle of separation of oxidized from non-oxidized species by affinity chromatography. As part of master's thesis, protein A affinity chromatography was used to monitor the oxidation levels of IgG1, IgG2 and IgG4 class immunoglobulins. We achieved the desired separation of oxidized immunoglobulins G from non-oxidized ones and based on the separation we successfully developed an analytical method for determining the degree of oxidation of immunoglobulins G. With the new analytical method, oxidations for IgG1, IgG2 and IgG4 class immunoglobulins can be determined quickly and easily. The results obtained by the new affinity chromatographic method are comparable to the reference peptide mapping method. We can also use a new analytical method for analysis of different immunoglobulins G, without prior change in chromatographic conditions.
Keywords:Immunoglobulin G, monoclonal antibody, oxidation, methionine, protein A, affinity chromatography


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