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Prepublished online as a Blood First Edition Paper on April 24, 2003; DOI 10.1182/blood-2002-09-2828.
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Blood, 15 August 2003, Vol. 102, No. 4, pp. 1435-1442
IMMUNOBIOLOGY
Ex vivo induction of multiple myeloma–specific cytotoxic T lymphocytes
Toshiaki Hayashi,
Teru Hideshima,
Masaharu Akiyama,
Noopur Raje,
Paul Richardson,
Dharminder Chauhan, and
Kenneth C. Anderson
From the Jerome Lipper Multiple Myeloma Center, Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA; and Department of Medicine, Harvard Medical School, Boston, MA.
Multiple myeloma (MM) is an incurable plasma cell malignancy characterized by immunosuppression. In this study, we identified factors in patients' bone marrow (BM) sera inhibiting autologous anti-MM immunity and developed an ex vivo strategy for inducing MM-specific cytotoxic T lymphocytes (CTLs). We found that sera from BM of MM patients inhibited induction of dendritic cells (DCs), evidenced by both phenotype and only weak stimulation of T-cell proliferation. Anti–vascular endothelial growth factor (anti-VEGF) and/or anti–interleukin 6 (anti–IL-6) antibodies neutralized this inhibitory effect, confirming that VEGF and IL-6, at least in part, mediate immunosuppression in MM patients. To induce MM-specific CTLs ex vivo, immature DCs were generated by culture of adherent mononuclear cells in medium containing granulocyte-macrophage colony-stimulating factor (GM-CSF) and IL-4 for 5 days and then cocultured with apoptotic MM bodies in the presence of tumor necrosis factor  (TNF-) for 3 days to induce their maturation. Autologous BM or peripheral blood mononuclear cells were stimulated weekly with these DCs, and cytotoxicity was examined against the MM cells used to pulse DCs. DCs cultured with apoptotic bodies stimulated significantly greater T-cell proliferation (stimulation index [SI] = 23.2 at a T-DC ratio of 360:1) than T cells stimulated by MM cells only (SI = 5.6), DCs only (SI = 9.3), or MM lysate–pulsed DCs (SI = 13.5). These CTLs from MM patients demonstrated specific cytotoxicity (24.7% at the effector-target [E/T] ratio of 40:1) against autologous primary MM cells. These studies therefore show that CTLs from MM patients can recognize and lyse autologous tumor cells and provide the framework for novel immunotherapy to improve patient outcome in MM.
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