Monoclonal Antibody-mediated Biomarker Discovery

The innovative process created by BSI scientists, called monoclonal antibody proteomics combines several key technologies consisting of the chromatographic processing of human plasma, the high throughput generation of monoclonal antibodies (mAbs), and high throughput screening (HTS) to identify those antibodies which are suitable for further development for the production of microarrays and/or novel diagnostic products. The antibodies are furthermore used to identify the cognate antigen.

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mAB_Chip

A Biosystems International felfedezett és létrehozott egy a plazma proteomban előforduló fehérjéket natív állapotban felismerő monoklonális ellenanyag könyvtárakat előállítani képes technológia platformot. E platform felhasználásával a human plasma proteom átfogó térképezésének első reális lehetősége nyílik meg.

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Randox-QuantiPlasm69 monoclonal antibody chip: a novel tool in plasma proteome analysis - CEEPC 2010

The plasma proteome profiling with monoclonal antibody based protein chips is a promising new tool in biomarker discovery that can be used to identify novel plasma markers in a wide variety of diseases. Recently a novel system – QuantiPlasm69 (QP69) – has been introduced by Randox Laboratories using 69 monoclonal antibodies (mAbs) – developed by BioSystems International – that can recognize different human plasma proteins. The mAbs are immobilized on 9x9 mm ceramic chips and a biotinylated plasma protein tracer is competing with plasma proteins in the tested sample for mAb binding. The amount of the bound tracer is determined by a streptavidin-peroxidase conjugate and a chemiluminescence substrate. We aimed to evaluate the analytical properties of QP69.

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Proteomics Profiling With Microarrays Based On Monoclonal Antibodies Generated Against Natural Plasma Proteome - CEEPC 2010

To address the imminent need for improved proteome profiling tools, we developed a proteome-wide strategy, (mAB proteomics) to obtain sufficiently comprehensive mAB libraries recognizing the natural immunogenic epitome of the human plasma proteome. Once the plasma epitome is sufficiently covered by hundreds to thousands of mABs, each directed against a different epitope, proteome profiling experiments can be performed similarly to gene expression profiling. After the important biomarker specific mABs are identified by mAB microarray experiments, the selected mABs are available for identification and characterization of the disease specific proteins.

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The use of phage display to characterize monoclonal antibody libraries produced against natural plasma epitome - CEEPC 2010

The goal of Biosystems International is to characterize the human plasma epitome using monoclonal antibody (mAb) libraries targeting all possible epitops of natural human plasma proteome. Due to our technology the antigen specificity of our mAb libraries are not known during the screening and selection steps. Beside the antigen protein ID, alternative methods exist to characterize mAbs, for example one of them is to find peptide epitope/mimotope IDs. Using the phage display technique in this study we were able to determine the epitope ID for approximately 80 % of the screened (altogether more than 400) mAbs in spite the fact that the used phage library displays only a fraction of the possible peptide combinations.

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QUANTIPLASMA69TM MONOKLONÁLIS ELLENANYAG CHIP: A PLAZMA PROTEOM VIZSGÁLATÁNAK ÚJ ESZKÖZE - MIT 2010

Bevezetés: A plazma proteom vizsgálata monoklonális ellenanyag (mEa) alapú fehérje chipekkel a biomarker azonosítás egyik ígéretes új eljárása. Segítségével új információkat kaphatunk különböző betegségek patomechanizmusáról, új plazma markereket tudunk különböző betegségekhez hozzárendelni, egyszerűbbé válhat ezen betegségek diagnosztikája és a betegségek lefolyásának követése. A közelmúltban a Randox Laboratories, a BioSystems International által előállított 69 mEa segítségével, egy új rendszert fejlesztett ki – QuantiPlasma69TM (QP69) –, amely plazma fehérjék különféle epitopjainak felismerésére és kvantitálására képes.

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Biomarker Discovery and Validation via mAb proteomics: Discovery of early markers of lung cancer - 2011

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Daganatos betegek plazma fehérjéinek multiplex összehasonlító analízise QUANTIPLASMA69 monoklonális ellenanyag chip segítségével - Randox Szimpózium 2011

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Monoklonális antitestek biotiniláltságának meghatározása különböző eljárásokkal - MBKE 2011


A biotin-streptavidin specifikus kötés kihasználása nagyon szerteágazó molekuláris biológiai és immunológiai módszerekben és azokkal összefüggő fejlesztésekben. Ezen fehérje alapú módszerek közé tartoznak az ELISA, immunprecipitáció, Western blot és egyéb biológiai eljárásokban felhasznált immobilizálási és detektálási technikák. A különböző módszerekben alkalmazott biotinilált fehérjék kereskedelmi forgalomban többnyire beszerezhetők, de bizonyos esetekben szükség van házilag biotinilált fehérjékre is.

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Fractionation of the human plasma proteome for monoclonal antibody proteomics-based biomarker discovery - Electrophoresis 32 (15), 1916-1925. doi: 10.1002/elps.201100018.


mAb proteomics, a reversed biomarker discovery approach, is a novel methodology to recognize the proteins of biomarker potential, but requires subsequent antigen identification steps. While in case of high-abundant proteins, it generally does not represent a problem, for medium or lower abundant proteins, the identification step requires a large amount of sample to assure the proper amount of antigen for the ID process. In this article, we report on the use of combined chromatographic and precipitation techniques to generate a large set of fractions representing the human plasma proteome, referred to as the Analyte Library, with the goal to use the relevant library fractions for antigen identification in conjunction with mAb proteomics.

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The use of phage display to characterize monoclonal antibody libraries produced against natural plasma epitome - CEEPC 2010

The goal of Biosystems International is to characterize the human plasma epitome using monoclonal antibody (mAb) libraries targeting all possible epitops of natural human plasma proteome. Due to our technology the antigen specificity of our mAb libraries are not known during the screening and selection steps.
Beside the antigen protein ID, alternative methods exist to characterize mAbs, for example one of them is to find peptide epitope/mimotope IDs. Using the phage display technique in this study we were able to determine the epitope ID for approximately 80 % of the screened (altogether more than 400) mAbs in spite the fact that the used phage library displays only a fraction of the possible peptide combinations. The obtained 12-mer peptide sequences of each screened mAbs were first ranked and then unique sequence(s) or motif(s) were determined. Unique sequence(s) of each antibody were used to determine the epitope level redundancy. We found that less than 5 % of successfully tested mAbs showed 50% or higher redundancy.
We applied Biacore technology utilizing phages and we could demonstrate the affinity of peptides to their specific mAbs, however the reproducibility of KD values was poor. Using streptavidin coated biochips to immobilize biotin labeled synthetic peptides in the Biacore experiments not only resolved reproducibility, but beside the affinity, peptide specificity could also be demonstrated. Specificity of these peptides to the corresponding mAbs was confirmed with ELISA experiments in streptavidin coated setup as well. Thus as a next step we tested 121 peptides (N terminal BioTide linker) in peptide array experiments. We found that in this setup 23 peptides recognized only one mAb out of the tested 16. The same 121 peptides (with biotin on the N terminal of BioTide linker) were tested in ELISA assays in similar setup, showing slightly different pattern of selectvity. The comparison of the selective recognition of 2 peptides indicated the importance of various and differently positioned linkers.
In conclusion we demonstrated that 12-mer peptides selected by phage display are useful tools to determine epitope level redundancy of mAb libraries or test specificity and affinity with either Biacore, or ELISA if special care is taken regarding the linker dependent flexibility of these short peptides in the experimental plan.

This work was supported by the National Office for Research and Technology of Hungary (TECH-09-A1-2009-0113; mAB-CHIC).
 

József Lázár1, Angéla Berki Pál1, Katalin Élesné Tóth1, Beáta Flachner2, István Hajdú2, Sándor Cseh2, László Takács1, István Kurucz1

1Biosystems International Ltd, Debrecen, Hungary

2TargetEx Ltd, Dunakeszi, Hungary

Hírek és események

2010-05-05

Biosystems International (BSI) a biotech- nology company focused on the development of novel monoclonal antibody-based diagnostics for cancer and metabolic diseases has established a licensing agreement with the Lohocla Research Corporation for the use of BSI’s patented monoclonal antibody proteo- mics platform for the discovery of novel alcoholism liver disease biomarkers in blood.

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2010-05-05

Biosystems International and Microbiochips sign collaboration agreement to commer- cialize PlasmaScan™ antibody microarray products.

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