title: Synthesis, biodistribution, and microsingle photon emission computed tomography (SPECT) imaging study of technetium-99m labeled PEGylated dendrimer poly(amidoamine) (PAMAM)-folic acid conjugates.
abstract: Three conjugates based on dendrimer PAMAM generation five were synthesized and radiolabeled successfully. To investigate their tumor targeting, the in vitro and in vivo stability, cell uptake, in vivo biodistribution, and micro-SPECT imaging were evaluated, respectively. The conjugate of (99m)Tc labeled PEGylated dendrimer PAMAM folic acid conjugate ((99m)Tc-G5-Ac-pegFA-DTPA) shows much higher uptake in KB cancer cells and accumulated more in the tumor area than that of the other two conjugates. The uptake in KB cells depends on the incubation time. The results of in vivo biodistribution agree with the data obtained from micro-SPECT imaging. These studies show that PEGylation of PAMAM dendrimer folic acid conjugate improves the tumor targeting. Folate-conjugated dendrimer maybe developed to be potential radiopharmaceuticals and targeted drug delivery systems.
authors.affiliation: Shanghai Institute of Applied Physics, Chinese Academy of Sciences, 2019 Baojia Road, Shanghai 201800, China.
authors.forename: Yuanqing
authors.initials: Y
authors.lastname: Zhang
authors.forename: Yanhong
authors.initials: Y
authors.lastname: Sun
authors.forename: Xiaoping
authors.initials: X
authors.lastname: Xu
authors.forename: Xuezhu
authors.initials: X
authors.lastname: Zhang
authors.forename: Hua
authors.initials: H
authors.lastname: Zhu
authors.forename: Liliang
authors.initials: L
authors.lastname: Huang
authors.forename: Yujin
authors.initials: Y
authors.lastname: Qi
authors.forename: Yu-Mei
authors.initials: YM
authors.lastname: Shen
mesh_terms: D000818:Animals; D045744:Cell Line, Tumor; D050091:Dendrimers / Q000138:chemical synthesis / Q000737:chemistry / Q000493:pharmacokinetics*; D016503:Drug Delivery Systems; D004355:Drug Stability; D005492:Folic Acid / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry / Q000493:pharmacokinetics*; D006801:Humans; D066298:In Vitro Techniques; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D009368:Neoplasm Transplantation; D011092:Polyethylene Glycols / Q000737:chemistry*; D019275:Radiopharmaceuticals / Q000138:chemical synthesis / Q000737:chemistry / Q000493:pharmacokinetics*; D013667:Technetium / Q000737:chemistry / Q000493:pharmacokinetics*; D014018:Tissue Distribution; D015899:Tomography, Emission-Computed, Single-Photon; D014183:Transplantation, Heterologous
chemical_list: D050091:Dendrimers; C104700:PAMAM Starburst; D019275:Radiopharmaceuticals; D011092:Polyethylene Glycols; D013667:Technetium; D005492:Folic Acid