In Adriamycin-sensitive and -resistant P388 cells, coincubation with amphotericin B causes a marked increase in Adriamycin retention, as determined by laser flow cytometry. P388/S cells were generally more affected than were P388/R cells. Preincubation with amphotericin B had a greater effect on Adriamycin retention than did co- or postincubation. In splenocytes, bone marrow, and ascites from mice, enhanced Adriamycin retention was seen in all the tissues. However, bone marrow cells showed heterogeneous response, with some populations being more sensitive than others.


Supported by USPHS Grant CA-29360 awarded by the National Cancer Institute, Department of Health and Human Services.

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