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Influence of Nuclides and Chelators on Imaging Using Affibody Molecules: Comparative Evaluation of Recombinant Affibody Molecules Site-Specifically Labeled with 68Ga and 111In via Maleimido Derivatives of DOTA and NODAGA
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Radiology, Oncology and Radiation Science, Biomedical Radiation Sciences. (Vladimir Tolmachev)
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Radiology, Oncology and Radiation Science, Biomedical Radiation Sciences. (Vladimir Tolmachev)
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy, Department of Medicinal Chemistry, Preclinical PET Platform.
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2013 (English)In: Bioconjugate chemistry, ISSN 1043-1802, E-ISSN 1520-4812, Vol. 24, no 6, 1102-1109 p.Article in journal (Refereed) Published
Abstract [en]

Accurate detection of cancer-associated molecular abnormalities in tumors could make cancer treatment more personalized. Affibody molecules enable high contrast imaging of tumor-associated protein expression shortly after injection. The use of the generator-produced positron-emitting radionuclide 68Ga should increase sensitivity of HER2 imaging. The chemical nature of radionuclides and chelators influences the biodistribution of Affibody molecules, providing an opportunity to further increase the imaging contrast. The aim of the study was to compare maleimido derivatives of DOTA and NODAGA for site-specific labeling of a recombinant ZHER2:2395 HER2-binding Affibody molecule with 68Ga. DOTA and NODAGA were site-specifically conjugated to the ZHER2:2395 Affibody molecule having a C-terminal cysteine and labeled with 68Ga and 111In. All labeled conjugates retained specificity to HER2 in vitro. Most of the cell-associated activity was membrane-bound with a minor difference in internalization rate. All variants demonstrated specific targeting of xenografts and a high tumor uptake. The xenografts were clearly visualized using all conjugates. The influence of chelator on the biodistribution and targeting properties was much less pronounced for 68Ga than for 111In. The tumor uptake of 68Ga-NODAGA-ZHER2:2395 and 68Ga-DOTA-ZHER2:2395 and tumor-to-blood ratios at 2 h p.i. did not differ significantly. However, the tumor-to-liver ratio was significantly higher for 68Ga-NODAGA- ZHER2:2395 (8 ± 2 vs 5.0 ± 0.3) offering the advantage of better liver metastases visualization. In conclusion, influence of chelators on biodistribution of Affibody molecules depends on the radionuclides and reoptimization of labeling chemistry is required when a radionuclide label is changed.

Place, publisher, year, edition, pages
2013. Vol. 24, no 6, 1102-1109 p.
National Category
Basic Medicine
Identifiers
URN: urn:nbn:se:uu:diva-203054DOI: 10.1021/bc300678yISI: 000320898900030PubMedID: 23705574OAI: oai:DiVA.org:uu-203054DiVA: diva2:634904
Note

De två (2) första författarna delar förstaförfattarskapet.

Available from: 2013-07-02 Created: 2013-07-02 Last updated: 2017-12-06Bibliographically approved
In thesis
1. Tumour Targeting using Radiolabelled Affibody Molecules: Influence of Labelling Chemistry
Open this publication in new window or tab >>Tumour Targeting using Radiolabelled Affibody Molecules: Influence of Labelling Chemistry
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Affibody molecules are promising candidates for targeted radionuclide-based imaging and therapy applications. Optimisation of targeting properties would permit the in vivo visualization of cancer-specific surface receptors with high contrast. In therapy, this may increase the ratio of radioactivity uptake between tumour and normal tissues.  This thesis work is based on 5 original research articles (papers I-V) and focuses on optimisation of targeting properties of anti-HER2 affibody molecules by optimising the labelling chemistry.

Paper I and II report the comparative evaluation of the anti-HER2 ZHER2:2395 affibody molecule site specifically labelled with 111In (suitable for SPECT imaging) and 68Ga (suitable for PET imaging) using the thiol reactive derivatives of DOTA and NODAGA as chelators. The incorporation of different macrocyclic chelators and labelling with different radionuclides modified the biodistribution properties of affibody molecules. This indicates that the labelling strategy may have a profound effect on the targeting properties of radiotracers and must be carefully optimized.

Paper III reports the study of the mechanism of renal reabsorption of anti-HER2 ZHER2:2395 affibody molecule. An unknown receptor (not HER2) is suspected to be responsible for the high reabsorption of ZHER2:2395 molecules in the kidneys.

Paper IV reports the optimization and development of in vivo targeting properties of 188Re-labelled anti-HER2 affibody molecules. By using an array of peptide based chelators, it was found that substitution of one amino acid by another or changing its position can have a dramatic effect on the biodistribution properties of 188Re-labelled affibody molecules. This permitted the selection of –GGGC chelator whichdemonstrated the lowest retention of radioactivity in kidneys compared to other variants and showed excellent tumour targeting properties.

Paper V reports the preclinical evaluation of 188Re-ZHER2:V2 as a potential candidate for targeted radionuclide therapy of HER2-expressing tumours. In vivo experiments in mice along with dosimetry assessment in both murine and human models revealed that future human radiotherapy studies using 188Re-ZHER2:V2 may be feasible.

It would be reasonable to believe that the results of optimisation of anti-HER2 affibody molecules summarized in this thesis can be of importance for the development of other scaffold protein-based targeting agents.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2014. 77 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Medicine, ISSN 1651-6206 ; 1013
Keyword
HER2, Affibody molecule, Radionuclide molecular maging, Targeted radionuclide therapy, Labeling chemistry
National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:uu:diva-229090 (URN)978-91-554-8983-0 (ISBN)
Public defence
2014-09-20, Rudbecksalen, DagHammarskjölds väg 20, Uppsala, 09:00 (English)
Opponent
Supervisors
Available from: 2014-08-28 Created: 2014-07-29 Last updated: 2014-09-08
2. Affibody Molecules for PET Imaging
Open this publication in new window or tab >>Affibody Molecules for PET Imaging
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Optimization of Affibody molecules would allow for high contrast imaging of cancer associated surface receptors using molecular imaging. The primary aim of the thesis was to develop Affibody-based PET imaging agents to provide the highest possible sensitivity of RTK detection in vivo. The thesis evaluates the effect of radiolabelling chemistry on biodistribution and targeting properties of Affibody molecules directed against HER2 and PDGFRβ. The thesis is based on five published papers (I-V).

Paper I. The targeting properties of maleimido derivatives of DOTA and NODAGA for site-specific labelling of a recombinant HER2-binding Affibody molecule radiolabelled with 68Ga were compared in vivo. Favourable in vivo properties were seen for the Affibody molecule with the combination of 68Ga with NODAGA.

Paper II. The aim was to compare the biodistribution of 68Ga- and 111In-labelled HER2-targeting Affibody molecules containing DOTA, NOTA and NODAGA at the N-terminus. This paper also demonstrated favourable in vivo properties for Affibody molecules in combination with 68Ga and NODAGA placed on the N-terminus.

Paper III.  The influence of chelator positioning on the synthetic anti-HER2 affibody molecule labelled with 68Ga was investigated. The chelator DOTA was conjugated either at the N-terminus, the middle of helix-3 or at the C-terminus of the Affibody molecules. The N-terminus placement provided the highest tumour uptake and tumour-to-organ ratios.

Paper IV. The aim of this study was to evaluate if the 68Ga labelled PDGFRβ-targeting Affibody would provide an imaging agent suitable for PDGFRβ visualization using PET. The 68Ga labelled conjugate provided high-contrast imaging of PDGFRβ-expressing tumours in vivo using microPET as early as 2h after injection.

Paper V. This paper investigated if the replacement of IHPEM with IPEM as a linker molecule for radioiodination of Affibody molecules would reduce renal retention of radioactivity. Results showed that the use of the more lipophilic linker IPEM reduced the renal radioactivity retention for radioiodinated Affibody molecules.

In conclusion, this thesis clearly demonstrates that the labelling strategy is of great importance with a substantial influence on the targeting properties of Affibody molecules and should be taken under serious considerations when developing new imaging agents.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2015. 70 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Medicine, ISSN 1651-6206 ; 1125
Keyword
Affibody molecules, Molecular imaging, PET, Radiolabelling, HER2, PDGFRβ
National Category
Medical and Health Sciences
Research subject
Biomedical Radiation Science
Identifiers
urn:nbn:se:uu:diva-259410 (URN)978-91-554-9299-1 (ISBN)
Public defence
2015-10-03, Fåhraeussalen, Rudbecklaboratoriet, Dag Hammarskjölds väg 20, 751 85, Uppsala, 09:00 (English)
Opponent
Supervisors
Available from: 2015-09-03 Created: 2015-08-03 Last updated: 2015-10-01

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Altai, MohamedStrand, JoannaSelvaraju, Ram KumarOrlova, AnnaTolmachev, Vladimir

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