Abstract
Purpose
The aim of this study was to explore an effective 124I labeling strategy and improve the signal-to-noise ratio when evaluating the expression of PD-L1 using an 124I-iodinated durvalumab (durva) F(ab')2 fragment.
Methods
The prepared durva F(ab')2 fragments were incubated with N-succinimidyl-3-(4-hydroxyphenyl) propionate (SHPP); after purification, the HPP-durva F(ab')2 was iodinated using Iodo-Gen method. After the radiochemical purity, stability, and specific activities were determined, the binding affinities of probes prepared using different labeling strategies were compared in vitro. The clinical application value of [124I]I-HPP-durva-F(ab')2 was confirmed by PET imaging. To more objectively evaluate the in vivo distribution and clearance of tracers, the pharmacokinetics and biodistribution assays were also performed.
Results
After being modified with SHPP, the average conjugation number of SHPP per durva-F(ab')2 identified by LC–MS was about 8.92 ± 2.84. The prepared [124I]I-HPP-durva F(ab')2 was obtained with a satisfactory radiochemical purity of more than 98% and stability of more than 93% when incubated for 72 h. Compared with unmodified [124I]I-durva F(ab')2, the specific activity of [124I]I-HPP-durva-F(ab')2 was improved (52.91 ± 5.55 MBq/mg and 15.91 ± 0.74 MBq/mg), while the affinity did not significantly change. The biodistribution experiments and PET imaging showed that the prepared [124I]I-HPP-durva-F(ab')2 exhibited an accelerated clearance and improved tumor-to-background ratio compared with [124I]I-durva-F(ab')2. The specificity of [124I]I-HPP-durva-F(ab')2 to PD-L1 was well demonstrated both in vitro and in vivo.
Conclusions
A PD-L1 PET imaging probe [124I]I-HPP-durva F(ab')2 was successfully synthesized through the SHPP modification strategy. The prepared probe was able to accurately evaluate the PD-L1 expression level through high-contrast noninvasive imaging.
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Data Availability
The data used to support the findings of this study are available from the corresponding authors upon reasonable request.
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Funding
This study was supported by the General Programs of the National Nature Science Foundation of China (Nos. 11875114, 82172002, and 82272058) and the Shanghai Municipal Science and Technology Committee of the Shanghai Outstanding Young Academic Leaders Plan (No. 21XD1423500). Clinical Research Project of Zhongshan Hospital, Fudan University (No. 2020ZSLC20).
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All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. Animal care and experimental procedures were conducted in compliance with the Helsinki Declaration and approved by the Ethical Committee of Zhongshan Hospital, Fudan University. The use of NSCLC patients tissue microarray was approved by the ethics committee of Outdo Biotech.
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Cheng, Y., Shi, D., Ye, R. et al. Noninvasive evaluation of PD-L1 expression in non-small cell lung cancer by immunoPET imaging using an acylating agent–modified antibody fragment. Eur J Nucl Med Mol Imaging 50, 1585–1596 (2023). https://doi.org/10.1007/s00259-023-06130-6
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DOI: https://doi.org/10.1007/s00259-023-06130-6