Water soluble inhibitors of topoisomerase I: quaternary salt derivatives of camptothecin.
Eleven water soluble 7-substituted quaternary ammonium salt derivatives of 10,11-(methylenedioxy)- and 10,11-(ethylenedioxy)-(20S)-camptothecin were synthesized via the Friedlander reaction followed by nucleophilic displacement with an aromatic amine. All of these compounds were more potent than camptothecin in the in vitro cleavable complex assay. These inherently charged camptothecin derivatives were cytotoxic against three different human tumor cell lines (SKOV3, an ovarian adenocarcinoma; SKVLB a multidrug resistant ovarian adenocarcinoma; and HT-29, a colon carcinoma). A selected group of five compounds was evaluated in the nude mouse HT-29 xenograft model. Two of these quaternary salts (17 and 18) were more efficacious than Topotecan in delaying tumor growth. In an extended in vivo model, 18 demonstrated tumor regression.
Lackey
K
K
Glaxo Wellcome Research Institute, Research Triangle Park, North Carolina 27709, USA.
Sternbach
D D
DD
Croom
D K
DK
Emerson
D L
DL
Evans
M G
MG
Leitner
P L
PL
Luzzio
M J
MJ
McIntyre
G
G
Vuong
A
A
Yates
J
J
Besterman
J M
JM
D000230:Adenocarcinoma / Q000201:enzymology / Q000473:pathology; D000818:Animals; D000970:Antineoplastic Agents / Q000737:chemistry / Q000494:pharmacology*; D002166:Camptothecin / Q000031:analogs & derivatives / Q000494:pharmacology*; D003110:Colonic Neoplasms / Q000201:enzymology / Q000473:pathology; D005260:Female; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D051379:Mice; D008819:Mice, Nude; D010051:Ovarian Neoplasms / Q000201:enzymology / Q000473:pathology; D012995:Solubility; D013329:Structure-Activity Relationship; D059004:Topoisomerase I Inhibitors; D014407:Tumor Cells, Cultured; D014867:Water
D000970:Antineoplastic Agents; D059004:Topoisomerase I Inhibitors; D014867:Water; D002166:Camptothecin