Cell death via DR5, but not DR4, is regulated by p53 in myeloma cells.
Myeloma cells are sensitive to TRAIL through the two death receptors DR4 and DR5. Because p53 directly modulates expression of death receptors, we investigated here whether p53 can modulate myeloma sensitivity to TRAIL. We found that p53 affects the sensitivity of myeloma cells to the DR5 agonistic human antibody lexatumumab but not the DR4 antibody mapatumumab. TP53 wild-type myeloma cells overexpressed DR5 in correlation with sensitivity to lexatumumab. Both nongenotoxic (nutlin-3a) and genotoxic (melphalan) p53-inducing stresses increased DR5 expression only in TP53 wild-type cells and synergistically increased lexatumumab efficiency yet did not increase DR4 expression, nor sensitivity to mapatumumab. Silencing of p53 strongly decreased DR5 expression and induced resistance to nutlin-3a and lexatumumab but did not modulate DR4 expression or sensitivity to mapatumumab. Increase of lexatumumab efficiency induced by nutlin-3a was related to a p53-dependent increase of DR5 expression. In primary myeloma cells, nutlin-3a increased DR5 expression and lexatumumab efficiency but did not increase mapatumumab efficiency. Taken together, our findings indicate that p53 controls the sensitivity of myeloma through DR5 but not DR4 and suggest that a subset of patients with multiple myeloma may benefit from DR5 therapy.
INSERM, UMR 892, Nantes, France.
Sylvanie
S
Surget
David
D
Chiron
Patricia
P
Gomez-Bougie
Géraldine
G
Descamps
Emmanuelle
E
Ménoret
Régis
R
Bataille
Philippe
P
Moreau
Steven
S
Le Gouill
Martine
M
Amiot
Catherine
C
Pellat-Deceunynck
D000911:Antibodies, Monoclonal / Q000494:pharmacology / Q000633:toxicity; D053181:Caspase 8 / Q000378:metabolism; D016923:Cell Death / Q000187:drug effects / Q000235:genetics; D045744:Cell Line, Tumor; D002872:Chromosome Deletion; D002886:Chromosomes, Human, Pair 17; D019008:Drug Resistance, Neoplasm / Q000235:genetics; D004789:Enzyme Activation / Q000187:drug effects; D020869:Gene Expression Profiling; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects; D020868:Gene Silencing; D006801:Humans; D007093:Imidazoles / Q000494:pharmacology; D009101:Multiple Myeloma / Q000235:genetics* / Q000378:metabolism*; D010879:Piperazines / Q000494:pharmacology; D053220:Receptors, TNF-Related Apoptosis-Inducing Ligand / Q000037:antagonists & inhibitors / Q000235:genetics* / Q000378:metabolism; D013312:Stress, Physiological / Q000187:drug effects / Q000235:genetics; D016159:Tumor Suppressor Protein p53 / Q000235:genetics / Q000378:metabolism*
D000911:Antibodies, Monoclonal; D007093:Imidazoles; D010879:Piperazines; D053220:Receptors, TNF-Related Apoptosis-Inducing Ligand; D016159:Tumor Suppressor Protein p53; C482205:nutlin 3; C510234:lexatumumab; D053181:Caspase 8