TRAIL receptor-selective mutants signal to apoptosis via TRAIL-R1 in primary lymphoid malignancies.
Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) and its agonistic antibodies, which are currently in early clinical trials for treating various malignancies, induce apoptosis through triggering of either TRAIL-R1 or TRAIL-R2. Based on studies using agonistic monoclonal antibodies, we recently proposed that primary chronic lymphocytic leukemic cells seem to signal apoptosis primarily through TRAIL-R1. We have now synthesized mutant forms of TRAIL specific for TRAIL-R1 or TRAIL-R2. The selectivity of these mutants to induce apoptosis in cell lines is due to selective binding to their cognate receptors resulting in apoptosis via formation of a death-inducing signaling complex. Using these mutants, we now unequivocally show that primary cells from patients with chronic lymphocytic leukemia and mantle cell lymphoma signal to apoptosis almost exclusively through TRAIL-R1. Thus, no significant therapeutic benefit can be anticipated from treating such patients with agents currently in clinical trials that signal predominantly through TRAIL-R2, such as HGS-ETR2 or Apo2L/TRAIL. Our study highlights the necessity to determine whether primary cells from a particular tumor signal via TRAIL-R1 or TRAIL-R2. Such information will provide a rational approach to optimize TRAIL therapy.
MacFarlane
Marion
M
Medical Research Council, Toxicology Unit, Hodgkin Building, University of Leicester, UK.
Kohlhaas
Susan L
SL
Sutcliffe
Michael J
MJ
Dyer
Martin J S
MJ
Cohen
Gerald M
GM
D048868:Adaptor Proteins, Signal Transducing / Q000378:metabolism; D000595:Amino Acid Sequence; D017209:Apoptosis; D051017:Apoptosis Regulatory Proteins / Q000378:metabolism; D053181:Caspase 8; D020169:Caspases / Q000378:metabolism; D053200:Fas-Associated Death Domain Protein; D006801:Humans; D015451:Leukemia, Lymphocytic, Chronic, B-Cell / Q000378:metabolism*; D020522:Lymphoma, Mantle-Cell / Q000378:metabolism*; D008562:Membrane Glycoproteins / Q000378:metabolism; D008969:Molecular Sequence Data; D009154:Mutation / Q000235:genetics*; D053220:Receptors, TNF-Related Apoptosis-Inducing Ligand; D018124:Receptors, Tumor Necrosis Factor / Q000235:genetics / Q000378:metabolism*; D017386:Sequence Homology, Amino Acid; D015398:Signal Transduction; D053221:TNF-Related Apoptosis-Inducing Ligand; D014407:Tumor Cells, Cultured; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism
D048868:Adaptor Proteins, Signal Transducing; D051017:Apoptosis Regulatory Proteins; C505533:FADD protein, human; D053200:Fas-Associated Death Domain Protein; D008562:Membrane Glycoproteins; D053220:Receptors, TNF-Related Apoptosis-Inducing Ligand; D018124:Receptors, Tumor Necrosis Factor; D053221:TNF-Related Apoptosis-Inducing Ligand; C105190:TNFRSF10A protein, human; C505639:TNFRSF10B protein, human; C505653:TNFSF10 protein, human; D014409:Tumor Necrosis Factor-alpha; C505530:CASP8 protein, human; D053181:Caspase 8; D020169:Caspases