Abstract
Most DBA mastocytoma and Sarcoma 180 cells trapped in the lungs of mice after i.v. injection died within 7 h. Rates of cell death were similar for both tumour cell lines. Rates of tumour cell death were unrelated to whether the cells were allogeneic or syngeneic, induced platelet aggregation or not, had different patterns of subsequent tumour growth, or were injected in varying numbers. Cell death was by coagulative necrosis, not apoptosis. Sarcoma 180 tumour cells were quickly localized in the lung and enclosed in platelet aggregates which remained, with degranulation, until the time of tumour cell death. However, platelet aggregation did not appear to play a role in tumour cell killing. The prevention of platelet aggregation by pretreatment of mice with an anticoagulant had little effect on the rate of death of tumour cells in the lung. Mastocytoma tumour cells did not cause platelet aggregation, yet died in the lung at similar rates to Sarcoma 180 cells. The killing of tumour cells in the lung did not appear to be cell-mediated. No mononuclear cells were seen in the vicinity of tumour cells and the type of cell death was not that associated with cell-mediated killing. The tumour cells did not die within 6 h of being injected into the peritoneal cavity. It is suggested that a nonspecific non-immunological process results in the death of intravenously injected tumour cells in the lung. This process was not affected by differing oxygen levels in the inhaled gas.
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