Abstract
A subline of Brown Norway (BN) acute myelocytic leukemia (AML) which can be propagated in suspension culture (designated IPC-81) is described. Injection into Lewis x BN F1 hybrid (LBN) rats resulted in a log-linear correlation between tumor cell dose and time till death from the onset of leukemia even after multiple (greater than 16) passages in vitro. An in vitro clonogenic assay for IPC-81 colony formation (CFU-leuk) was developed with excellent cloning efficiency (55-82%). Colonies grew without the addition of specific growth factors; syngeneic spleen-conditioned medium inhibited CFU-leuk by 40%, but co-culture with untreated normal LBN rat bone marrow cells had no effect on CFU-leuk. CFU-leuk could be detected in the bone marrow 7 to 10 days before morphologic detection of leukemia in injected animals. This cell line should prove useful in the preclinical evaluation of new strategies for treating AML and evaluating new bone marrow purging methods.
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