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Indirect Radioiodination of DARPin G3 Using N-succinimidyl-Para-Iodobenzoate Improves the Contrast of HER2 Molecular Imaging
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Immunology, Genetics and Pathology, Medical Radiation Science.ORCID iD: 0000-0002-4778-3909
Russian Acad Sci, Mol Immunol Lab, Shemyakin & Ovchinnikov Inst Bioorgan Chem, Moscow 117997, Russia.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy, Department of Medicinal Chemistry, Theranostics.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Immunology, Genetics and Pathology.
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2019 (English)In: International Journal of Molecular Sciences, ISSN 1422-0067, E-ISSN 1422-0067, Vol. 20, no 12, article id 3047Article in journal (Refereed) Published
Abstract [en]

Radionuclide molecular imaging of human epidermal growth factor receptor 2 (HER2) in breast and gastroesophageal cancer might be used to stratify patients for HER2-targeted therapy as well as monitor treatment response and disease progression. Designed ankyrin repeat proteins (DARPins) are small engineered scaffold proteins with favorable properties for molecular imaging. Herein we compared two methods for labeling the anti-HER2 DARPin (HE)(3)-G3, direct and indirect radioiodination. We hypothesized that the use of N-succinimidyl-para-iodobenzoate (SPIB) for radioiodination would facilitate the clearance of radiometabolites and improve the contrast of imaging. Both radiolabeled (HE)(3)-G3 variants preserved their binding specificity and high affinity to HER2-expressing cells. The specificity of tumor targeting in vivo was also demonstrated. A biodistribution comparison of [I-125]I-(HE)(3)-G3 and [I-125]I-PIB-(HE)(3)-G3, in mice bearing HER2 expressing SKOV3 xenografts, showed rapid clearance of [I-125]I-PIB-(HE)(3)-G3 from normal organs and tissues and low accumulation of activity in organs with NaI-symporter expression. Both radiolabeled (HE)(3)-G3 variants had equal tumor uptake. Consequently, the indirect label provided higher tumor-to-blood and tumor-to-organ ratios compared with the direct label. Comparative Single Photon Emission Computed Tomography (SPECT)/CT imaging of HER2 expression in SKOV3 xenografts, using both radiolabeled DARPins, demonstrated the superior imaging contrast of the indirect label. Indirect radioiodination of (HE)(3)-G3 using SPIB could be further applied for SPECT and PET imaging with iodine-123 and iodine-124.

Place, publisher, year, edition, pages
MDPI, 2019. Vol. 20, no 12, article id 3047
Keywords [en]
DARPin, HER2, imaging, radionuclide, iodine, radioiodination
National Category
Radiology, Nuclear Medicine and Medical Imaging
Identifiers
URN: urn:nbn:se:uu:diva-390692DOI: 10.3390/ijms20123047ISI: 000473756000197PubMedID: 31234471OAI: oai:DiVA.org:uu-390692DiVA, id: diva2:1342875
Funder
Swedish Research Council, 2015-02353Swedish Research Council, 2015-02509Swedish Cancer Society, CAN 2015/350Swedish Cancer Society, 2017/425Available from: 2019-08-14 Created: 2019-08-14 Last updated: 2019-08-14Bibliographically approved

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