Abstract
Ganglioside GM2 (GM2) frequently appears on the cell surface of human cancers of neuroendocrine origin. A mouse‐human chimeric monoclonal antibody (mAb), KM966, against GM2 was previously found to promote the lysis of various cancer cells by human blood mononnclear cells (MNC). In this study, we analyzed the effector cells responsible for the chimeric mAb‐dependent cell‐mediated cytotoxicity (ADCC) against small cell lung cancer (SCLC) cells and examined the enhancing effect of various cytokines on the ADCC activity. The ADCC activity was assessed by 4‐h 51Cr release assay. Highly purified lymphocytes (>99%) and monocytes (>90%) were separated by centrifugal elutriation from peripheral blood MNC of the same healthy donor. KM966 induced lysis of SCLC cells mediated by both lymphocytes and monocytes to similar extents, in a dose‐dependent manner. Pretreatment of lymphocytes with various cytokines [interleukin (IL)‐2, IL‐12 and interferon‐γ] and that of monocytes with macrophage‐colony‐stimulating factor significantly augmented the killer activity against SCLC cells in the presence of KM966 mAb. KM966 was also effective for the lysis of non‐small cell lung cancer cells in direct proportion to the GM2 expression levels. These findings suggest that combined treatment of KM966 mAb with cytokines may be therapeutically useful for in vivo killing of lung cancer cells expressing GM2 through the ADCC reaction.
Keywords: Ganglioside GM2, Chimeric antibody, KM966, ADCC
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