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Impact of assay temperature on antibody binding characteristics in living cells: A case study
Ridgeview Instruments AB, Skillsta 4, S-74020 Uppsala, Sweden..
Charles Univ Prague, Fac Pharm, Dept Biophys & Phys Chem, Hradec Kralove 50005, Czech Republic..
Karlstad Univ, Dept Engn & Chem Sci, S-65188 Karlstad, Sweden..
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Immunology, Genetics and Pathology, Medical Radiation Science. Ridgeview Instruments AB, Skillsta 4, S-74020 Uppsala, Sweden.ORCID iD: 0000-0001-9141-9242
2017 (English)In: BIOMEDICAL REPORTS, ISSN 2049-9434, Vol. 7, no 5, p. 400-406Article in journal (Refereed) Published
Abstract [en]

Kinetic and thermodynamic studies of ligand-receptor interactions are essential for increasing the understanding of receptor activation mechanisms and drug behavior. The characterization of molecular interactions on living cells in real-time goes beyond most current binding assays, and provides valuable information about the dynamics and underlying mechanism of the molecules in a living system. The effect of temperature on interactions in cell-based assays is, however, rarely discussed. In the present study, the effect of temperature on binding of monoclonal antibodies, cetuximab and pertuzumab to specific receptors on living cancer cells was evaluated, and the affinity and kinetics of the interactions were estimated at selected key temperatures. Changes in the behavior of the interactions, particularly in the on- and off-rates were observed, leading to greatly extended time to reach the equilibrium at 21 degrees C compared with at 37 degrees C. However, the observed changes in kinetic characteristics were less than a factor of 10. It was concluded that it is possible to conduct real-time measurements with living cells at different temperatures, and demonstrated that influences of the ambient temperature on the interaction behavior are likely to be less than one order of magnitude.

Place, publisher, year, edition, pages
2017. Vol. 7, no 5, p. 400-406
Keywords [en]
drug kinetics, thermodynamics, real-time interactions, clinical monoclonal antibodies, growth factor receptors
National Category
Medical Biotechnology (with a focus on Cell Biology (including Stem Cell Biology), Molecular Biology, Microbiology, Biochemistry or Biopharmacy)
Identifiers
URN: urn:nbn:se:uu:diva-345264DOI: 10.3892/br.2017.982ISI: 000417416000002PubMedID: 29181152OAI: oai:DiVA.org:uu-345264DiVA, id: diva2:1189307
Funder
EU, Horizon 2020, 2014-2020Available from: 2018-03-09 Created: 2018-03-09 Last updated: 2019-11-22Bibliographically approved
In thesis
1. Towards time-resolved molecular interaction assays in living bacteria
Open this publication in new window or tab >>Towards time-resolved molecular interaction assays in living bacteria
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Rare and neglected diseases such as multidrug resistant (MDR) tuberculosis, malaria and trypanosomiasis are re-emerging in Europe. New strategies are needed to accelerate drug discovery to fight these pathogens. AEGIS is a Pan-European project that combines different technologies to accelerate the discovery of molecules suitable for drug development in selected neglected diseases. This thesis is part of the AEGIS research area that considers time in a multidisciplinary approach, combining biology, physics and mathematics to provide tools to characterize biological events for improving drug development and information about the target diseases and lead compounds.

Real-time cell binding assays (RT-CBA) of receptor-ligand interactions are fundamental in basic research and drug discovery. However, this kind of assays are still rare on living cells, especially in the microbiology field. In this project, we apply the same high-precision assay type on bacterial systems and explored the interior of the cell with a time resolved assay.

The effect of temperature was evaluated in the RT-CBA using LigandTracer to ensure that it was possible to use the technology in a range of temperatures suitable for bacteria. A method for attaching Gram positive and negative bacteria on the surface of a normal Petri dish, showing a high reproducibly and a high cellular viability after 16 h. With these two key steps, an RT-CBA fit for microbiology is available.

Next, to answer biological questions, intracellular interactions were explored by expression and validation of intracellular proteins with fluorescent tags suitable for RT-CBAs. First, we used the subunit B from the Shiga toxin (STxB) as a model to understand different aspects about the internalization processes. RT-CBAs allowed to discovery new features of STxB binding and mechanism to deliver small molecules or small proteins into cancer cells. Then, for exploring intracellular interactions, insect cells were bioengineered for evaluating the ability of small molecules to internalize and bind to its target. Using Carbonic anhydrase II – sulfonamides as a model system, the molecular interaction in the cytoplasm could be measured using a quencher label approach. The development of this kind of novel RT-CBA tools provide new information about drug candidates for targets that are not properly expressed in bacterial cells.

The assays in this project can make drug design more efficient. Furthermore, the evaluation of binding activity of the new compounds developed by AEGIS, focusing on rare/neglected diseases, in a biological environment has the potential to accelerate drug discovery for the targeted emerging diseases.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2019. p. 63
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Medicine, ISSN 1651-6206 ; 1618
Keywords
Intracellular Molecular Interactions, Real-Time Cell Binding Assays, Bacteria, LigandTracer, Kinetics
National Category
Medical Laboratory and Measurements Technologies Pharmaceutical Sciences
Research subject
Biochemistry; Biopharmaceutics; Medical Science
Identifiers
urn:nbn:se:uu:diva-396008 (URN)978-91-513-0819-7 (ISBN)
Public defence
2020-01-24, Uppsala, 13:00 (English)
Opponent
Supervisors
Available from: 2019-12-18 Created: 2019-11-22 Last updated: 2020-01-13

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Andersson, Karl

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