Anticancer drug delivery systems: multi-loaded N4-acyl poly(ethylene glycol) prodrugs of ara-C. II. Efficacy in ascites and solid tumors.
The synthesis of branched PEG (40,000) acids has been achieved using aspartic acid (Asp) and AspAsp dendrons. Complete conjugation of these dendritic acids with cytosine arabinoside (ara-C) was achieved by the use of spacers that allowed a greater separation of the branches to accommodate several large ara-C molecules in proximity to each other. The tetrameric and octameric PEG-ara-C amide prodrugs were much more effective in the treatment of solid and ascites tumors compared to the native drug. The greater loading of the PEG backbone appears to have achieved a minimum threshold concentration for the therapeutic delivery of ara-C.
Choe
Yun H
YH
Enzon, Inc., 20 Kingsbridge Road, Piscataway, NJ 08854-3969, USA.
Conover
Charles D
CD
Wu
Dechun
D
Royzen
Maksim
M
Gervacio
Yoany
Y
Borowski
Virna
V
Mehlig
Mary
M
Greenwald
Richard B
RB
D000818:Animals; D000964:Antimetabolites, Antineoplastic / Q000008:administration & dosage* / Q000737:chemistry; D002286:Carcinoma, Ehrlich Tumor / Q000188:drug therapy*; D003561:Cytarabine / Q000008:administration & dosage* / Q000737:chemistry; D016503:Drug Delivery Systems / Q000379:methods* / Q000706:statistics & numerical data; D004354:Drug Screening Assays, Antitumor / Q000379:methods / Q000706:statistics & numerical data; D005260:Female; D006801:Humans; D007941:Leukemia P388 / Q000188:drug therapy; D051379:Mice; D008819:Mice, Nude; D011092:Polyethylene Glycols / Q000008:administration & dosage* / Q000737:chemistry; D011355:Prodrugs / Q000008:administration & dosage* / Q000737:chemistry; D012997:Solvents / Q000008:administration & dosage; D014407:Tumor Cells, Cultured; D023041:Xenograft Model Antitumor Assays / Q000379:methods / Q000706:statistics & numerical data
D000964:Antimetabolites, Antineoplastic; D011355:Prodrugs; D012997:Solvents; D003561:Cytarabine; D011092:Polyethylene Glycols