In vitro and In vivo selective antitumor activity of Edelfosine against mantle cell lymphoma and chronic lymphocytic leukemia involving lipid rafts.
OBJECTIVE
Mantle cell lymphoma (MCL) and chronic lymphocytic leukemia (CLL) remain B-cell malignancies with limited therapeutic options. The present study investigates the in vitro and in vivo effect of the phospholipid ether edelfosine (1-O-octadecyl-2-O-methyl-rac-glycero-3-phosphocholine) in MCL and CLL.


METHODS
Several cell lines, patient-derived tumor cells, and xenografts in severe combined immunodeficient mice were used to examine the anti-MCL and anti-CLL activity of edelfosine. Furthermore, we analyzed the mechanism of action and drug biodistribution of edelfosine in MCL and CLL tumor-bearing severe combined immunodeficient mice.


RESULTS
Here, we have found that the phospholipid ether edelfosine was the most potent alkyl-lysophospholipid analogue in killing MCL and CLL cells, including patient-derived primary cells, while sparing normal resting lymphocytes. Alkyl-lysophospholipid analogues ranked edelfosine > perifosine >> erucylphosphocholine > or = miltefosine in their capacity to elicit apoptosis in MCL and CLL cells. Edelfosine induced coclustering of Fas/CD95 death receptor and rafts in MCL and CLL cells. Edelfosine was taken up by malignant cells, whereas normal resting lymphocytes hardly incorporated the drug. Raft disruption by cholesterol depletion inhibited drug uptake, Fas/CD95 clustering, and edelfosine-induced apoptosis. Edelfosine oral administration showed a potent in vivo anticancer activity in MCL and CLL xenograft mouse models, and the drug accumulated dramatically and preferentially in the tumor.


CONCLUSIONS
Our data indicate that edelfosine accumulates and kills MCL and CLL cells in a rather selective way, and set coclustering of Fas/CD95 and lipid rafts as a new framework in MCL and CLL therapy. Our data support a selective antitumor action of edelfosine.
Instituto de Biología Molecular, Centro de Investigación del Cáncer, Consejo Superior de Investigaciones Cientificas-Universidad de Salamanca, Spain. fmollin@usal.es
Faustino
F
Mollinedo
Janis
J
de la Iglesia-Vicente
Consuelo
C
Gajate
Ander
A
Estella-Hermoso de Mendoza
Janny A
JA
Villa-Pulgarin
Mercè
M
de Frias
Gaël
G
Roué
Joan
J
Gil
Dolors
D
Colomer
Miguel A
MA
Campanero
Maria J
MJ
Blanco-Prieto
D000818:Animals; D000970:Antineoplastic Agents / Q000627:therapeutic use; D017209:Apoptosis / Q000187:drug effects; D049109:Cell Proliferation / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D006801:Humans; D015451:Leukemia, Lymphocytic, Chronic, B-Cell / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology; D020522:Lymphoma, Mantle-Cell / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology; D021962:Membrane Microdomains / Q000187:drug effects* / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D016513:Mice, SCID; D010742:Phospholipid Ethers / Q000627:therapeutic use*; D013379:Substrate Specificity / Q000187:drug effects; D014407:Tumor Cells, Cultured; D023041:Xenograft Model Antitumor Assays
D000970:Antineoplastic Agents; D010742:Phospholipid Ethers; C026659:edelfosine