title: Design, synthesis and antitumor properties of glycosylated antitumor ether lipid (GAEL)- chlorambucil-hybrids.
abstract: Glycosylated antitumor ether lipids (GAELs) kill cancer cells and cancer stem cells via a novel, apoptosis-independent mechanism. In contrast, chlorambucil, a drug in clinical use for the treatment of chronic lymphocytic leukemia reacts with nucleophiles within the major groove of DNA, leading to apoptosis. We hypothesized that hybrid molecules that combine apoptosis-dependent and apoptosis-independent mode of actions in a single molecule may lead to enhanced antitumor activity. Here, we describe the antitumor activities of chlorambucil-linked glucosamine-derived glycerolipid hybrids and investigate the role of the chlorambucil moiety and the effect of cationic charge on the hybrid molecule. Three hybrids and two control GAELs were synthesized and their activities against breast (JIMT1, MDA-MB-231, BT474), pancreas (MiaPaCa2) and prostate (DU145, PC3) cancer cell lines were determined using MTS assay. Hybrid 3 displayed the most potent activity on DU145 at CC50 of 6.0 μM while hybrid 4 displayed the best activity on JIMT1 at 7.5 μM. Hybrid 5 exhibited no activity at the highest concentration tested (CC50 >20 μM), underscoring the significance of the cationic charge at C-2 position as previously reported. Although chlorambucil (2) itself showed very little activity against all the six cell lines (CC50 >150 μM), GAELs 6 and 7 which lack the chlorambucil moiety were consistently less active than 3 and 4, suggesting that the chlorambucil moiety contributes to the overall activity. The hybrids were however not as active as the parent GAEL 1 against MiaPaCa2 whereas 6 restored activity comparable to 1.
authors.affiliation: Department of Chemistry, University of Manitoba, 144 Dysart Rd, Winnipeg MB, R3T 2N2, Canada.
authors.forename: Temilolu
authors.initials: T
authors.lastname: Idowu
authors.affiliation: Department of Biochemistry and Medical Genetics, University of Manitoba, 745 Bannatyne Avenue, Winnipeg MB, R3E 0J9, Canada.
authors.forename: Pranati
authors.initials: P
authors.lastname: Samadder
authors.affiliation: Department of Biochemistry and Medical Genetics, University of Manitoba, 745 Bannatyne Avenue, Winnipeg MB, R3E 0J9, Canada. Electronic address: gilbert.arthur@umanitoba.ca.
authors.forename: Gilbert
authors.initials: G
authors.lastname: Arthur
authors.affiliation: Department of Chemistry, University of Manitoba, 144 Dysart Rd, Winnipeg MB, R3T 2N2, Canada. Electronic address: schweize@cc.umanitoba.ca.
authors.forename: Frank
authors.initials: F
authors.lastname: Schweizer
mesh_terms: D000970:Antineoplastic Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D049109:Cell Proliferation / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D002699:Chlorambucil / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D015195:Drug Design; D004354:Drug Screening Assays, Antitumor; D004987:Ethers / Q000737:chemistry* / Q000494:pharmacology; D006017:Glycolipids / Q000737:chemistry* / Q000494:pharmacology; D006031:Glycosylation; D006801:Humans; D015394:Molecular Structure; D013329:Structure-Activity Relationship; D014407:Tumor Cells, Cultured
chemical_list: D000970:Antineoplastic Agents; D004987:Ethers; D006017:Glycolipids; D002699:Chlorambucil
keywords: Antitumor agent; Cationic lipid; Chlorambucil-linked hybrid; Cytotoxic lipid; Glycolipid; Hybrid drug