^18F-SFB—Annexin B1探测细胞凋亡实验研究

Evaluation of ^18F-SFB-Annexin B1 in detecting apoptosis

目的 在体外及体内评价自动化合成模块合成的18F-N-琥珀酰亚胺-4-氟苯甲酸酯（SFB）-膜联蛋白（Annexin）B1探测细胞凋亡.方法 使用anti-Fas抗体诱导Jurkat细胞发生凋亡,用流式细胞仪检测细胞凋亡存在.通过暂时性阻断家兔肾动脉（45 min）使单侧肾经缺血再灌注发生细胞凋亡,24 h后静脉注射18F-SFB-Annexin B1,分别于注射后10,30,60,90,120和240 min行PET/CT显像.采用原位末端标记法（TUNEL）和HE染色法证实肾存在细胞凋亡.结果 用antiFas抗体诱导后细胞调亡率实验组为25.98%（120 min）,对照组仅为1.81%;实验组细胞对18F-SFBAnnexin B1的摄取高于对照组,在注射18F-SFB-Annexin B1后240 min PET/CT图像上,处理侧肾的放射性摄取高于正常对照肾.TUNEL和HE染色法证实处理侧肾存在大量细胞凋亡.结论 18F-SFB-Annexin B1保留了同磷脂酰丝氨酸（PS）结合的生物活性,在体外及体内探测细胞凋亡方面具有应用潜力.

Objective To evaluate 18F-N- succinimidyl -4-fluorobenzoate （SFB）-Annexin B1 in detectingin vitro andin vivo apoptosis. Methods Anti-Fas antibody was used to induce apoptosis in Jurkat cells. Apoptosis in Jurkat cells was confirmed by flow cytometer （FCM）. Unilateral renal ischemia/reperfusion injury was induced by transient （45 min） ligation of the renal artery in the rabbit. The rabbit was then administrated with 18F-SFB-Annexin B1 intravenously 24 h later and then imaged by PET/CT at 10,30,60,90,120 and 240 min postinjection. Apoptosis in kidney was confirmed by terminal deoxynucleotidyl transferase mediated dUTP biotin nick end labeling （TUNEL） assay and HE staining. Results The apoptosis rate induced by anti-Fas antibody was 25.98%（120 min） while that in the control group was only 1.81%. The uptake of 18F-SFB-Annexin B1in apoptosis group was greater than that in the control group. PET/CT images at 240 min showed higher uptake in the ligated kidney than the non-ligated kidney. TUNEL assay and HE staining confirmed great amount apoptotic cells in the ligated kidney. Conclusion 18 F-SFB-Annexin B1may be potentially useful in detecting apoptosis both in vitro and in vivo.