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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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.
The performance of QP69 system was tested by the Evidence Investigator analyzer. In order to find the optimal dilution 10-fold dilution series of control plasmas were trialed. As the 100- and 1,000-times dilutions seemed to be optimal for most of the antibodies, these have been used in the reproducibility measurements. The intra- and interassay variability was determined in one plasma sample using six parallel determinations repeated three-times in three experimental days. An interoperator variability was also calculated as the 6 replicates per day were prepared by 2 operators.
The optimal plasma dilution has been determined to be 300-times, with which 57 of the 69 mAbs can measure both a decrease and an increase in protein concentration. At this dilution 4 of the remaining 12 mAbs will measure an increase in plasma protein concentration, while 8 mAbs will measure a decrease in protein concentration. The maximal relative light unit (RLUmax) – in the presence of the tracer alone – changed from 400 to 35,000. The intra-, interassay and interoperator %CVs were typically <15%. In the presence of the tested plasma sample when the RLU signal was within the optimal inhibition range (30% to 70%) the intra-, interassay and interoperator RLU %CVs were also typically <15%.

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

 

Péter Antal-Szalmás1, József Lázár2, Róza Földesi1, Zoltán Steiber1, Amy Bradley3, Stuart McGregor3, John V. Lamont3, S. Peter Fitzgerald3, László Takács2, István Kurucz2, János Kappelmayer1

 

1University of Debrecen, Medical and Health Science Center, Department of Clinical Biochemistry and Molecular Pathology, Debrecen, Hungary

2Biosystems International Ltd, Debrecen, Hungary

3Randox Laboratories Ltd., Crumlin, United Kingdom


 

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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