title: An in vivo molecular imaging probe (18)F-Annexin B1 for apoptosis detection by PET/CT: preparation and preliminary evaluation.
abstract: There is an increasing need to develop non-invasive molecular imaging strategies for visualizing and quantifying apoptosis status of diseases (especially for cancer) for diagnosis and monitoring treatment response. Since externalization of phosphatidylserine (PS) is one of the early molecular events during apoptosis, Annexin B1 (AnxB1), a member of Annexins family with high affinity toward the head group of PS, could be a potential positron emission tomography (PET) imaging probe for imaging cell death process after labeled by positron-emitting nuclides, such as (18)F. In the present study, we investigated a novel PET probe, (18)F-labeled Annexin B1 ((18)F-AnxB1), for apoptosis imaging. (18)F-AnxB1 was prepared reliably by conjugating AnxB1 with a (18)F-tag, N-succinimidyl 4-[(18)F]fluorobenzoate ([(18)F]SFB), in a radiolabeling yield of about 20 % within 40 min. The in vitro binding of (18)F-AnxB1 with apoptotic cells induced by anti-Fas antibody showed twofold increase compared to those without treatment, confirmed by flow cytometric analysis with AnxV-FITC/PI staining. Stability tests demonstrated (18)F-AnxB1 was rather stable in vitro and in vivo without degradation. The serial (18)F-AnxB1 PET/CT scans in healthy rats outlined its biodistribution and pharmacokinetics, indicating a rapid renal clearance and predominant accumulation into kidney and bladder at 2 h p.i. (18)F-AnxB1 PET/CT imaging was successfully applied to visualize in vivo apoptosis sites in tumor induced by chemotherapy and in kidney simulated by ischemia-reperfusion injury. The high-contrast images were obtained at 2 h p.i. to delineate apoptotic tumor. Apoptotic region could be still identified by (18)F-AnxB1 PET 4 h p.i., despite the high probe retention in kidneys. In summary, we have developed (18)F-AnxB1 as a PS-specific PET probe for the apoptosis detection and quantification which could have broad applications from disease diagnosis to treatment monitoring, especially in the cases of cancer.
authors.affiliation: PET Center, Department of Nuclear Medicine, Fudan University Shanghai Cancer Center, Shanghai 200032, China.
authors.forename: Ming-Wei
authors.initials: MW
authors.lastname: Wang
authors.forename: Fang
authors.initials: F
authors.lastname: Wang
authors.forename: Yu-Jia
authors.initials: YJ
authors.lastname: Zheng
authors.forename: Ying-Jian
authors.initials: YJ
authors.lastname: Zhang
authors.forename: Yong-Ping
authors.initials: YP
authors.lastname: Zhang
authors.forename: Qing
authors.initials: Q
authors.lastname: Zhao
authors.forename: Clifton Kwang-Fu
authors.initials: CK
authors.lastname: Shen
authors.forename: Yue
authors.initials: Y
authors.lastname: Wang
authors.forename: Shu-Han
authors.initials: SH
authors.lastname: Sun
mesh_terms: D000818:Animals; D017302:Annexins / Q000138:chemical synthesis; D017209:Apoptosis / Q000502:physiology*; D005260:Female; D005462:Fluorine Radioisotopes; D006801:Humans; D019169:Jurkat Cells; D007674:Kidney Diseases / Q000175:diagnosis; D008325:Mammary Neoplasms, Experimental / Q000175:diagnosis; D064847:Multimodal Imaging / Q000379:methods*; D009368:Neoplasm Transplantation; D010718:Phosphatidylserines / Q000378:metabolism; D049268:Positron-Emission Tomography; D011817:Rabbits; D051381:Rats; D015427:Reperfusion Injury / Q000175:diagnosis; D014057:Tomography, X-Ray Computed
chemical_list: D017302:Annexins; D005462:Fluorine Radioisotopes; D010718:Phosphatidylserines