Sortase A-mediated site-specific labeling of camelid single-domain antibody-fragments: a versatile strategy for multiple molecular imaging modalities
| Autor: | Catarina Xavier, Serge Muyldermans, Anton Bunschoten, Sophie Hernot, Sam Massa, Christian Vanhove, Vicky Caveliers, Steven Ballet, Benedicte Descamps, Nick Devoogdt, Fijs W. B. van Leeuwen, Tony Lahoutte, Jan Steyaert, Saskia Vanderhaegen, Niravkumar Arvindbhai Vikani, Cecilia Betti |
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| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
medicine.diagnostic_test Chemistry 010402 general chemistry 01 natural sciences Fluorescence 0104 chemical sciences 03 medical and health sciences 030104 developmental biology Single-domain antibody Biochemistry Positron emission tomography Sortase Sortase A Click chemistry medicine Radiology Nuclear Medicine and imaging Molecular imaging Emission computed tomography |
| Zdroj: | Contrast Media & Molecular Imaging. 11:328-339 |
| ISSN: | 1555-4309 |
| Popis: | A generic site-specific conjugation method that generates a homogeneous product is of utmost importance in tracer development for molecular imaging and therapy. We explored the protein-ligation capacity of the enzyme Sortase A to label camelid single-domain antibody-fragments, also known as nanobodies. The versatility of the approach was demonstrated by conjugating independently three different imaging probes: the chelating agents CHX-A"-DTPA and NOTA for single-photon emission computed tomography (SPECT) with indium-111 and positron emission tomography (PET) with gallium-68, respectively, and the fluorescent dye Cy5 for fluorescence reflectance imaging (FRI). After a straightforward purification process, homogeneous single-conjugated tracer populations were obtained in high yield (30-50%). The enzymatic conjugation did not affect the affinity of the tracers, nor the radiolabeling efficiency or spectral characteristics. In vivo, the tracers enabled the visualization of human epidermal growth factor receptor 2 (HER2) expressing BT474M1-tumors with high contrast and specificity as soon as 1 h post injection in all three imaging modalities. These data demonstrate Sortase A-mediated conjugation as a valuable strategy for the development of site-specifically labeled camelid single-domain antibody-fragments for use in multiple molecular imaging modalities. Copyright © 2016 John Wiley & Sons, Ltd. |
| Databáze: | OpenAIRE |
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