Mimosine arrests the cell cycle after cells enter S-phase

被引:62
作者
Hughes, TA [1 ]
Cook, PR [1 ]
机构
[1] UNIV OXFORD,SIR WILLIAM DUNN SCH PATHOL,CRC,NUCL STRUCT & FUNCT RES GRP,OXFORD OX1 3RE,ENGLAND
基金
英国医学研究理事会;
关键词
D O I
10.1006/excr.1996.0035
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
L-Mimosine (beta-N-[3-hydroxy-4-pyridone]-alpha-aminopropionic acid)-a rare amino acid derived from Mimosa and Leucaena plants-arrests cells reversibly late during G1 phase or at the beginning of S-phase. If mimosine were to arrest cells immediately before S-phase, it would provide a superb tool for the investigation of the initiation of DNA synthesis, Therefore, we reexamined the point of action of mimosine. Mitotic HeLa cells were released into 200 mu M mimosine and grown for similar to 10 h to block them, before the cells were permeabilized and the amino acid removed by washing them thoroughly. On addition of the appropriate triphosphates, DNA synthesis-measured by the incorporation of [P-32]dTTP-began immediately; as it is known that such permeabilized cells cannot initiate DNA synthesis but can only resume elongating previously initiated chains, mimosine must arrest after DNA synthesis has begun. Moreover, cells grown in mimosine assembled functional replication factories-detected by immunolabeling after incorporation of biotin-dUTP-that were typical of those found early during S-phase. Disappointingly, it seems that mimosine-like aphidocolin-blocks only after cells enter S-phase. (C) 1996 Academic Press, Inc.
引用
收藏
页码:275 / 280
页数:6
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