title: Nucleoside conjugates. 11. Synthesis and antitumor activity of 1-beta-D-arabinofuranosylcytosine and cytidine conjugates of thioether lipids.
abstract: Five 1-beta-D-arabinofuranosylcytosine conjugates and two cytidine conjugates of thioether lipids (1-S-alkylthioglycerols) linked by a pyrophosphate diester bond have been prepared and their antitumor activity against an ara-C2 sensitive (L1210/0) and two ara-C resistant L1210 lymphoid leukemia sublines in mice were evaluated. These prodrugs of ara-C include ara-CDP-rac-1-S-hexadecyl-2-O-palmitoyl-1-thioglycerol (8a), ara-CDP-rac-1-S-octadecyl-2-O-palmitoylthioglycerol (8b), and ara-CDP-rac-1-S-octadecyl-2-O-methyl(or -ethyl, -hexadecyl)thioglycerols (8c-e). The cytidine conjugates include CDP-rac-1-S-octadecyl-2-O-palmitoyl(or -methyl)- 1-thioglycerols (9a and 9b). Sonicated solutions of the conjugates existed in the form of micellar disks (size 0.01-0.04 microns). Single doses (200-400 mg/kg) of 8a and 8b produced significant increase in life span (257-371%) in mice bearing ip implanted L1210/0 leukemia. In contrast, conjugates 8c-e were less effective (ILS 19-75%) and cytidine conjugates (9a and 9b) were ineffective. Even though 8a and 8b were found to be curative in a high percentage of mice bearing ip implanted partially ara-C resistant L1210 subline [L1210/ara-C(I)], they were completely ineffective against deoxycytidine kinase deficient ara-C resistant L1210 subline [L1210/ara-C(II)]. However, the present results, together with the previous, demonstrate that 8a and 8b are promising new prodrugs of ara-C with improved efficacy.
authors.affiliation: Department of Neurosurgery, Roswell Park Memorial Institute, Buffalo, New York 14263.
authors.forename: C I
authors.initials: CI
authors.lastname: Hong
authors.forename: A J
authors.initials: AJ
authors.lastname: Kirisits
authors.forename: A
authors.initials: A
authors.lastname: Nechaev
authors.forename: D J
authors.initials: DJ
authors.lastname: Buchheit
authors.forename: C R
authors.initials: CR
authors.lastname: West
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000138:chemical synthesis*; D055598:Chemical Phenomena; D002621:Chemistry; D003561:Cytarabine / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000627:therapeutic use; D007939:Leukemia L1210 / Q000188:drug therapy; D051379:Mice; D010742:Phospholipid Ethers / Q000138:chemical synthesis* / Q000627:therapeutic use; D013329:Structure-Activity Relationship
chemical_list: D000970:Antineoplastic Agents; D010742:Phospholipid Ethers; D003561:Cytarabine; C063784:ara-CDP-1-S-octadecyl-2-O-palmitoyl-1-thioglycerol; C063783:ara-CDP-1-S-hexadecyl-2-O-palmitoyl-1-thioglycerol