Comparative Evaluation of Radioiodine and Technetium-Labeled DARPin 9_29 for Radionuclide Molecular Imaging of HER2 Expression in Malignant Tumors; Contrast Media & Molecular Imaging (CMMI); Vol. 2018

Comparative Evaluation of Radioiodine and Technetium-Labeled DARPin 9_29 for Radionuclide Molecular Imaging of HER2 Expression in Malignant Tumors; Contrast Media & Molecular Imaging (CMMI); Vol. 2018

Bibliographic Details
Parent link:Contrast Media & Molecular Imaging (CMMI)
Vol. 2018.— 2018.— [6930425, 11 p.]
Other Authors: Vorobjeva (Vorobyeva) A. G. Anzhelika Grigorjevna, Bragina O. D. Olga Dmitrievna, Altai M. Mohamed, Orlova A. M. Anna Markovna, Shulga (Schulga) A. A. Aleksey Anatolievich, Proshkina G. M. Galina Mikhaylovna, Chernov V. I. Vladimir Ivanovich, Tolmachev V. M. Vladimir Maksimilianovich, Deev S. M. Sergey Mikhaylovich
Summary:Title screen
High expression of human epidermal growth factor receptor 2 (HER2) in breast and gastroesophageal carcinomas is a predictive biomarker for treatment using HER2-targeted therapeutics (antibodies trastuzumab and pertuzumab, antibody-drug conjugate trastuzumab DM1, and tyrosine kinase inhibitor lapatinib). Radionuclide molecular imaging of HER2 expression might permit stratification of patients for HER2-targeting therapies. In this study, we evaluated a new HER2-imaging probe based on the designed ankyrin repeat protein (DARPin) 9_29. DARPin 9_29 was labeled with iodine-125 by direct radioiodination and with [99mTc]Tc(CO)3using the C-terminal hexahistidine tag. DARPin 9_29 preserved high specificity and affinity of binding to HER2-expressing cells after labeling. Uptake of [125I]I-DARPin 9_29 and [99mTc]Tc(CO)3-DARPin 9_29 in HER2-positive SKOV-3 xenografts in mice at 6 h after injection was 3.4 ± 0.7 %ID/g and 2.9 ± 0.7 %ID/g, respectively. This was significantly () higher than the uptake of the same probes in HER2-negative Ramos lymphoma xenografts, 0.22 ± 0.09 %ID/g and 0.30 ± 0.05 %ID/g, respectively. Retention of [125I]I-DARPin 9_29 in the lung, liver, spleen, and kidneys was appreciably lower compared with [99mTc]Tc(CO)3-DARPin 9_29, which resulted in significantly () higher tumor-to-organ ratios. The biodistribution data were confirmed by SPECT/CT imaging. In conclusion, radioiodine is a preferable label for DARPin 9_29.
Language:English
Published: 2018
Subjects:
электронный ресурс
труды учёных ТПУ
сравнительная оценка
радиоактивный йод
технеций
радионуклидная диагностика
злокачественные опухоли
Online Access:https://doi.org/10.1155/2018/6930425
Format: Electronic Book Chapter
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=659730

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