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Cytokine detection by antibody-based proximity ligation.
Uppsala University, Medicinska vetenskapsområdet, Faculty of Medicine, Department of Genetics and Pathology.
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2004 In: Proc Natl Acad Sci U S A, ISSN 1091-6490, Vol. 101, no 22, 8420-8424 p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2004. Vol. 101, no 22, 8420-8424 p.
URN: urn:nbn:se:uu:diva-95756OAI: oai:DiVA.org:uu-95756DiVA: diva2:170088
Available from: 2007-04-23 Created: 2007-04-23Bibliographically approved
In thesis
1. Development and Application of Triple Specific Proximity Ligation Assays (3PLA)
Open this publication in new window or tab >>Development and Application of Triple Specific Proximity Ligation Assays (3PLA)
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

After the completion of the human genome project the human genome was annotated with the surprisingly small amount of 24 000 (www.ensemble.com) genes. This has focused research on the contribution of splice variants, posttranslational modifications and interactions of proteins at the proteome level and other regulatory elements in the cell to fully understand the complexity of functions in a higher organism. Proteomic oriented projects are currently aiming to investigate all the splice variants and posttranslational modifications of all the proteins present in an organism or cell type and annotate their function and interaction partners. Projects on this scale are at the moment difficult to achieve and new methodologies are needed.

Proximity ligation assays (PLAs) are based on a novel protein detection strategy that converts the presence of a target molecule in a unique DNA tag through ligation reactions. PLA detection of proteins requires several independent recognition events by affinity reagents that have been converted into proximity probes. Different formats of the proximity ligation strategy have been developed in both heterogeneous and homogeneous format[1-4]. This thesis presents the development of an antibody based proximity ligation approach and the development of a novel proximity ligation based detection strategy named triple specific proximity ligation (3PLA). To extend the range of target molecules we adapted the proximity ligation assay for the use with antibodies by converting matched monoclonal antibody pairs and polyclonal antibody batches into proximity probes and used them for the detection of several cytokines in complex biological fluids. The novel 3PLA requires the simultaneous detection by three independent affinity binders to create one specific DNA based signal. This requirement for triple recognition extends the biological specificity of immunoassays and allows a proximity ligation design with reduced background signal and thus higher sensitivity. We have established proof of principle detection of the biomarkers troponin I and prostate specific antigen (PSA) alone and in complex with 1-alpha-antichymotrypsin (ACT) and detected as little as 100 molecules of vascular endothelial growth factor (VEGF). To further explore the extended biological specificity of 3PLA we adapted the assay for detection of protein complexes formed during NFκB signaling and used this system to profile the mode of action of three small molecular weight inhibitors of the IκB Kinase (IKK). The development of new protein detection methods hold promises for the investigation of complex interactions and mechanism on the proteome level which are not accessible with current technologies. We have developed tools and protocols useful for the development of new proximity ligation strategies and designs. These protocols allow the rapid and low cost custom set up of PLAs without the need for extensive conjugation protocols or purification procedures.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2007. 36 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Medicine, ISSN 1651-6206 ; 252
Molecular medicine, proxmity ligation, method development, cell siganling, Molekylärmedicin
urn:nbn:se:uu:diva-7819 (URN)978-91-554-6865-1 (ISBN)
Public defence
2007-05-15, Rudbecksalen, Rudbecklaboratoriet, Dag Hammarsjköldsväg 20, Uppsala, 13:15
Available from: 2007-04-23 Created: 2007-04-23Bibliographically approved

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