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1998 ; 89
(10
): 1067-73
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Cytotoxicity of amrubicin, a novel 9-aminoanthracycline, and its active
metabolite amrubicinol on human tumor cells
#MMPMID9849587
Yamaoka T
; Hanada M
; Ichii S
; Morisada S
; Noguchi T
; Yanagi Y
Jpn J Cancer Res
1998[Oct]; 89
(10
): 1067-73
PMID9849587
show ga
Amrubicin, a completely synthetic 9-aminoanthracycline derivative, was previously
shown to have potent antitumor activities against various human tumor xenografts.
In this study, the in vitro activities of amrubicin and its major metabolite,
amrubicinol, were examined using 17 human tumor cell lines. Amrubicinol was 5 to
54 times more potent than amrubicin, and as potent as doxorubicin, in inhibiting
the growth of the cells following 3-day continuous drug exposure. Amrubicinol
closely resembled doxorubicin in its profile of activities on the 17 human tumor
cell lines. Cells were incubated with the drugs for 1 h, and the intracellular
drug concentration and cell growth inhibition after 3 days were determined.
Amrubicinol attained similar intracellular concentrations at lower medium
concentrations compared to amrubicin, and the intracellular concentration of
amrubicinol necessary to produce 50% cell growth inhibition was 3 to 8 times
lower than that of amrubicin in 4 cell lines tested. Amrubicinol has a higher
activity level inside the cells than does amrubicin. When cells were incubated
with amrubicin for 5 h, a substantial amount of amrubicinol, more than 9% of that
of amrubicin, was found in cells in 4 of the 8 cell lines tested. Amrubicinol may
contribute to the in vitro growth-inhibitory effect of amrubicin on these cells.
The results suggest that amrubicinol plays an important role in the in vivo
antitumor effect of amrubicin as an active metabolite.