title: Polyethylene glycol conjugates of methotrexate and melphalan: synthesis, radiolabeling and biologic studies.
abstract: Polyethylene glycols (PEGs) are potential drug carriers for humanizing the therapeutic index of anti-cancer agents. In this paper, we report on the modification of the anticancer drugs, methotrexate (MTX) and melphalan (L-PAM), covalently linked to PEGs for drug delivery. Conjugates of MTX and L-PAM were analyzed through different spectroscopic techniques. Both conjugates were labeled with (99m)Tc by the classical way, using reducing agents at a physiologic pH. Blood kinetic data revealed the biphasic pattern of clearance. Evaluation of the in vitro cytotoxicity of the drug polymer conjugates on the U87MG human glioma cell line revealed that the conjugates showed enhanced dose-dependent cytotoxicity.
authors.affiliation: Department of Chemistry, University of Delhi, Delhi, India.
authors.forename: Gauri
authors.initials: G
authors.lastname: Shukla
authors.forename: Anjani K
authors.initials: AK
authors.lastname: Tiwari
authors.forename: Nitin
authors.initials: N
authors.lastname: Kumar
authors.forename: Deepa
authors.initials: D
authors.lastname: Sinha
authors.forename: Pushpa
authors.initials: P
authors.lastname: Mishra
authors.forename: Harish
authors.initials: H
authors.lastname: Chandra
authors.forename: Anil K
authors.initials: AK
authors.lastname: Mishra
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000008:administration & dosage; D001932:Brain Neoplasms / Q000188:drug therapy*; D045744:Cell Line, Tumor; D004305:Dose-Response Relationship, Drug; D005910:Glioma / Q000188:drug therapy*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008558:Melphalan / Q000008:administration & dosage*; D008727:Methotrexate / Q000008:administration & dosage*; D051379:Mice; D011092:Polyethylene Glycols / Q000737:chemistry / Q000378:metabolism*; D011108:Polymers / Q000737:chemistry; D014018:Tissue Distribution
chemical_list: D000970:Antineoplastic Agents; D011108:Polymers; D011092:Polyethylene Glycols; D008558:Melphalan; D008727:Methotrexate