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Cell fusion is not involved in the generation of giant cells in the Hodgkin‐Reed Sternberg cell line L1236

The mechanism of multinucleated cell formation in Hodgkin's disease has not yet been elucidated. We asked whether the giant multinucleated cells of the H‐RS cell line L1236 develop via fusion of the predominant smaller cells. As a positive control for the fusion assay, human B cells from the B‐cell lymphoma cell line BJA‐B were split into two fractions, stained with the fluorochromes CMTMR and CMFDA, respectively, and fused using the polyethylene glycol 1500 cell hybridization protocol. Double‐stained cells indicating fusion of BJA‐B cells were detectable for up to 5 days. In parallel, L1236 cells were split into two fractions, stained with the fluorochromes, and mixed. No double‐stained L1236 cells were detected. The same result was obtained when using FACS‐sorted small mononuclear L1236 cells. It is thus concluded that the large multinucleated cells of the monoclonal H‐RS cell line L1236 have emerged by endomitosis rather than by spontaneous cell fusion. Am. J. Hematol. 67:6–9, 2001. © 2001 Wiley‐Liss, Inc.