1.中山大学附属第三医院核医学科,广东 广州 510630
2.华南农业大学实验动物中心,广东 广州 510640
李宛如,硕士生,研究方向:医学影像与核医学专业,E-mail:liwr25@mail2.sysu.edu.cn
收稿:2022-01-26,
纸质出版:2022-05-20
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李宛如,陈光锋,杨婷等.68Ga标记的磁性铁氧体纳米颗粒PET/MRI双模态显像探针的制备及研究[J].中山大学学报(医学科学版),2022,43(03):430-436.
LI Wan-ru,CHEN Guang-feng,YANG Ting,et al.Investigation of 68Ga-Labeled Magnetic Ferrite Nanoparticles PET/MRI Dual-Modal Imaging Probe[J].Journal of Sun Yat-sen University(Medical Sciences),2022,43(03):430-436.
李宛如,陈光锋,杨婷等.68Ga标记的磁性铁氧体纳米颗粒PET/MRI双模态显像探针的制备及研究[J].中山大学学报(医学科学版),2022,43(03):430-436. DOI: 10.13471/j.cnki.j.sun.yat-sen.univ(med.sci).2022.0311.
LI Wan-ru,CHEN Guang-feng,YANG Ting,et al.Investigation of 68Ga-Labeled Magnetic Ferrite Nanoparticles PET/MRI Dual-Modal Imaging Probe[J].Journal of Sun Yat-sen University(Medical Sciences),2022,43(03):430-436. DOI: 10.13471/j.cnki.j.sun.yat-sen.univ(med.sci).2022.0311.
目的
2
制备
68
Ga标记的磁性锰铁氧纳米颗粒PET/MRI双模态显像探针,考察其作为前列腺癌显像新型分子探针的可能。
方法
2
以超顺磁锰铁氧纳米粒子为核心,利用成纤维激活蛋白抑制剂和羟基琥珀酰亚胺-四氮杂环十二烷四乙酸(DOTA)修饰,螯合正电子放射性核素
68
Ga,制备出纳米探针
68
Ga-DOTA-UMFNPs-FAPI-04。对纳米探针进行基本表征,分析其细胞毒性、放射化学纯度和稳定性。观察纳米探针在正常小鼠的体内分布和对荷瘤鼠的MRI显像效果。
结果
2
经纯化后,
68
Ga-DOTA-UMFNPs-FAPI-04放化纯为94%,稳定性良好。MRI T
2
测试显示其T2弛豫率约为39.02 mmol
-1
·s
-1
。正常鼠体内分布显示,
68
Ga-DOTA-UMFNPs-FAPI-04在肝脏、脾脏的放射性摄取较高。MRI显像显示,荷瘤鼠经尾静脉注射纳米探针后30 min,肿瘤部位可观察到摄取。
结论
2
成功构建PET/MRI双模态显像探针
68
Ga-DOTA-UMFNPs-FAPI-04,具有MRI T2造影剂特性,对小鼠前列腺肿瘤MRI显像良好,具备PET显像潜力。该研究为构建前列腺癌多模态成像探针提供了一个新的思路。
Objective
2
To prepare
68
Ga-labeled magnetic ferrite nanoparticles PET/MRI dual-modal imaging probe and evaluate the possibility of using it as a novel molecular probe for prostate cancer imaging.
Methods
2
Using superparamagnetic manganese iron oxide nanoparticles as the key component, fibroblast inhibitor and DOTA-NHS ester as the modification,along with chelating the positron radionuclide
68
Ga, we prepared the nanoprobe
68
Ga-DOTA-UMFNPs-FAPI-04. Characterization of nanoprobe and analysis of its cytotoxicity, radiochemical purity and stability were performed during the whole process. The observation of the distribution of nanoprobes in normal mice was performed. The effect of nanoprobes on MRI imaging on tumor-bearing mice was analyzed.
Results
2
After purification, the radiochemical purity of probe was 94%, also it had high stability. MRI T2 test showed that its T2 relaxation rate was about 39.02 mM
-1
·s
-1
. The bio-distribution in the normal mice showed that
68
Ga-DOTA-UMFNPs- FAPI-04 had a higher uptake in liver and spleen. MRI imaging demonstrated that tumor could be observed clearly after probe injection in 30 minutes.
Conclusions
2
We have successfully constructed the PET/MRI dual-modal imaging probe
68
Ga-DOTA-UMFNPs-FAPI-04. It has the characteristics of MRI T2 contrast agent and it also performs well in the MRI imaging of prostate tumors and has the potential of PET imaging. The study provides a new idea for constructing a multi-modal imaging probe for prostate cancer.
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