Nan oparticles with effective tumor accumulation and efficient renal clearance have attracted significant interests for clinical applications.Weprepared 2.5 nm tyrosine based carbon dots(TCDs)with phenolic hydroxyl gr...Nan oparticles with effective tumor accumulation and efficient renal clearance have attracted significant interests for clinical applications.Weprepared 2.5 nm tyrosine based carbon dots(TCDs)with phenolic hydroxyl groups on the surface for directly 125I labeling.The 125I labeledpolyethylene glycol(PEG)functionalized TCDs(125I-TCDPEGs)showed excellent radiochemical stability both in vitro and in vivo.Due to theenhanced permeability and retentio n effect,these 125I-TCDPEGs demonstrated a tumor accumulatio n around 4%-5%of the injected doseper gram(ID/g)for U87MG,4T1,HepG2 and MCF7 tumor-bearing mice at 1 h post-injection.Meanwhile,the 125I-TCDPEGs also could befast renally excreted,with less than 0.6%ID/g left in the liver and spleen within 24 h.These radioactive carb on dots not only can be used forcellular fluorescence imaging due to their intrinsic optical property,but are also effective single photon emission computed tomography(SPECT)imaging agents for tumor.Together with their excellent biocompatibility and stability,we anticipate these 125I-TCDPEGs of great potential for earlytumor diagnosis in clinic.Whafs more,our TCDPEGs are also proved to be feasible carriers for other iodine isotopes such as 127I and 131I fordifferent biomedical application.展开更多
基金X.S.acknowledges the National Key Research and Development Program of China(No.2016YFA0203600)the National Natural Science Foundation of China(Nos.81971738 and 81571743)the Project Program of State Key Laboratory of Natural Medicines,and the China Pharmaceutical University(No.SKLNMZZRC05).
文摘Nan oparticles with effective tumor accumulation and efficient renal clearance have attracted significant interests for clinical applications.Weprepared 2.5 nm tyrosine based carbon dots(TCDs)with phenolic hydroxyl groups on the surface for directly 125I labeling.The 125I labeledpolyethylene glycol(PEG)functionalized TCDs(125I-TCDPEGs)showed excellent radiochemical stability both in vitro and in vivo.Due to theenhanced permeability and retentio n effect,these 125I-TCDPEGs demonstrated a tumor accumulatio n around 4%-5%of the injected doseper gram(ID/g)for U87MG,4T1,HepG2 and MCF7 tumor-bearing mice at 1 h post-injection.Meanwhile,the 125I-TCDPEGs also could befast renally excreted,with less than 0.6%ID/g left in the liver and spleen within 24 h.These radioactive carb on dots not only can be used forcellular fluorescence imaging due to their intrinsic optical property,but are also effective single photon emission computed tomography(SPECT)imaging agents for tumor.Together with their excellent biocompatibility and stability,we anticipate these 125I-TCDPEGs of great potential for earlytumor diagnosis in clinic.Whafs more,our TCDPEGs are also proved to be feasible carriers for other iodine isotopes such as 127I and 131I fordifferent biomedical application.
