Abstract:
:We evaluated the ability of 2 human mAbs directed against TRAILR1 (HGS-ETR1) and TRAILR2 (HGS-ETR2) to kill human myeloma cells. HGS-ETR1 and HGS-ETR2 mAbs killed 15 and 9 human myeloma cell lines (HMCLs; n = 22), respectively. IL-6, the major survival and growth factor for these HMCLs, did not prevent their killing. Killing induced by either HGS-ETR1 or HGS-ETR2 was correlated with the cleavage of Mcl-1L, a major molecule for myeloma survival. Mcl-1L cleavage and anti-TRAILR HMCL killing were dependent on caspase activation. Kinetic studies showed that Mcl-1L cleavage occurred very early (less than 1 hour) and became drastic once caspase 3 was activated. Our data showed that both the extrinsic (caspase 8, Bid) and the intrinsic (caspase 9) pathways are activated by anti-TRAIL mAb. Finally, we showed that the HGS-ETR1 and, to a lesser extent, the HGS-ETR2 mAbs were able to induce the killing of primary myeloma cells. Of note, HGS-ETR1 mAb was able to induce the death of medullary and extramedullary myeloma cells collected from patients at relapse. Taken together, our data clearly encourage clinical trials of anti-TRAILR1 mAb in multiple myeloma, especially for patients whose disease is in relapse, at the time of drug resistance.
journal_name
Bloodjournal_title
Bloodauthors
Menoret E,Gomez-Bougie P,Geffroy-Luseau A,Daniels S,Moreau P,Le Gouill S,Harousseau JL,Bataille R,Amiot M,Pellat-Deceunynck Cdoi
10.1182/blood-2005-12-007971subject
Has Abstractpub_date
2006-08-15 00:00:00pages
1346-52issue
4eissn
0006-4971issn
1528-0020pii
blood-2005-12-007971journal_volume
108pub_type
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