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Anthracyclines Trigger Apoptosis of Both G₀-G₁ and Cycling Peripheral Blood Lymphocytes and Induce Massive Deletion of Mature T and B Cells¹

Laboratory of Immunology, Institut National de la Santé et de la Recherche Médicale U503 UCBL, Hospital E. Herriot, 69437 Lyon Cedex 03 [C. F., L. Q., C. T., J-P. R., N. B-B.], and Laboratory of Biochemistry and Pharmacology, Institut National de la Santé et de la Recherche Médicale U352, INSA-Lyon, 69621 Villeurbanne Cedex [A-F. P.], France

The anthracyclines daunorubicin and doxorubicin were shown to induce apoptosis of hematopoietic cell lines. Here we report that they induce apoptosis of both nonactivated and phytohemagglutinin-activated human peripheral blood lymphocytes. Apoptosis demonstrated by surface expression of phosphatidylserine and typical nuclear alterations reached a maximum after 48 h of incubation with these agents. In contrast to topoisomerase inhibitors (etoposide and camptothecin) and antimetabolites (methotrexate and 5-fluorouracil) that induced apoptosis of activated cells only, daunorubicin and doxorubicin triggered apoptosis of cells in the G₀-G₁ phases of the cell cycle. In agreement with in vitro data, a single i.p. injection of daunorubicin or doxorubicin in BALB/c mice induced T- and B-cell depletion in spleen, lymph nodes, and to a lesser extent in the thymus. Soluble Fas-Fc, CD95 antagonistic antibodies, as well as the p55 tumor necrosis factor receptor-immunoglobulin fusion protein, did not inhibit drug-induced apoptosis. The level of reactive oxygen species was significantly increased in the presence of daunorubicin or doxorubicin only in nonactivated lymphocytes. However, antioxidants such as N-acetyl-L-cysteine or glutathione did not prevent apoptosis. Activation of caspase-3 after daunorubicin or doxorubicin treatment of either nonactivated or activated lymphocytes was demonstrated by the cleavage of poly(ADP-ribose) polymerase, which was, as apoptosis, inhibited by the peptide benzyloxycarbonyl-Val-Ala-Asp-fluoromethylketone. Finally, daunorubicin and doxorubicin induced a rapid production of ceramides. These data indicate that anthracyclines may induce major peripheral T-cell deletion, a property not shared by many cytotoxic agents.

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