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Increased mitochondrial uptake of rhodamine 123 by CDDP treatment.

Abstract：

:Rhodamine 123 (R 123) is a positively charged dye at physiological pH that accumulates specifically in the mitochondria of living cells without cytotoxic effect. In the present study, the uptake of R 123 by EL-4 lymphoma cells in culture with anticancer agents was measured by flow cytometry. Changes in R 123 uptake during the cultivation period were compared with cell distribution at different phases of the cell cycle. According to the increase in the proportion of S phase cells, mitochondrial synthesis increased, giving rise to a maximal fluorescence intensity of about 1.3-fold. Synchronous cultures showed the same relationship between increased mitochondrial uptake of R 123 and the S phase fraction as was observed in normal cultures. After treatment with 10(-3) M 5-fluorouracil (5-FU) for 1 h, EL-4 cells showed an increased binding of R 123 per cell followed by an accumulation of early S phase cells transiently. However, uptake of R 123 decreased 24 h later. On the contrary, after treatment with 10 micrograms/ml of cis-diamminedichloroplatinum (CDDP), a G2 + M block was observed from 12 h of reseeding and accumulation of the G2 + M cells continued. In this case, high uptake of R 123 continued during the observation period. From these results, mitochondrial synthesis seemed to increase according to the increment in proportion of S phase when the acceleration of the cell cycle turnover was augmented or the cycle was blocked in S phase by 5-FU. CDDP inhibited the cell division at G2 + M phase and caused increased R 123 fluorescence per cell. The stainability of R 123 may indicate the activity of cell division and may be a good way of evaluating the efficacy of antitumor drugs on the cells.

journal_name

Exp Cell Res

journal_title

Experimental cell research

authors

Shinomiya N,Tsuru S,Katsura Y,Sekiguchi I,Suzuki M,Nomoto K

doi

10.1016/0014-4827(92)90162-2

subject

Has Abstract

pub_date

1992-01-01 00:00:00

pages

159-63

issue

1

eissn

0014-4827

issn

1090-2422

pii

0014-4827(92)90162-2

journal_volume

198

pub_type

杂志文章

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