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.

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

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