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Blood, 1 November 2001, Vol. 98, No. 9, pp. 2771-2777
NEOPLASIA
Complement-mediated cell death induced by rituximab in B-cell
lymphoproliferative disorders is mediated in vitro by a
caspase-independent mechanism involving the generation of reactive
oxygen species
Beatriz Bellosillo,
Neus Villamor,
Armando López-Guillermo,
Silvia Marcé,
Jordi Esteve,
Elias Campo,
Dolors Colomer, and
Emili Montserrat
From the Hematopathology Unit, Department of
Hematology, Institute of Hematology and Oncology, Department of
Pathology, Postgraduate School of Hematology Farreras-Valentí;
the Institut d'Investigacions Biomèdiques August Pi i Sunyer
(IDIBAPS), Hospital Clínic; and the University of Barcelona,
Barcelona, Spain.
Mechanisms involving the in vitro effect of rituximab in cells from
55 patients with B-cell lymphoproliferative disorders were
investigated. No cytotoxic effect was observed when cells were
incubated with rituximab alone, but in the presence of human AB serum
rituximab induced complement-dependent cell death (R-CDC). A cytotoxic
effect was observed in cells from 9 of 33 patients with B-cell chronic
lymphocytic leukemia, 16 of 16 patients with mantle-cell lymphoma, 4 of
4 patients with follicular lymphoma, and 2 of 2 patients with
hairy-cell leukemia. R-CDC was observed in cells from patients
expressing more than 50 × 103 CD20 molecules per cell,
and directly correlated with the number of CD20 molecules per cell.
Preincubation with anti-CD59 increased the cytotoxic effect of
rituximab and sensitized cells from nonsensitive cases. Neither
cleavage of poly-ADP ribose polymerase (PARP) nor activation of
caspase-3 was observed in R-CDC. In addition, no cells with a
hypodiploid DNA content were detected and R-CDC was not prevented by a
broad-spectrum caspase inhibitor, suggesting a caspase-independent
mechanism. Incubation with rituximab in the presence of AB serum
induced a rapid and intense production of reactive oxygen species
(ROS). R-CDC was blocked by the incubation of cells with
N-acetyl-L-cysteine (NAC) or Tiron, 2 ROS scavengers, indicating that
the cytotoxic effect was due to the generation of superoxide
(O ) radicals. In conclusion, the results of the
present study suggest that CD20, CD59, and complement have a
role in the in vitro cytotoxic effect of rituximab, which is mediated
by a caspase-independent process that involves ROS generation.

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