A reversible arrest point in the late G1 phase of the mammalian cell cycle.
The effects of two different cell cycle inhibitors on the proliferation of human lymphoblastoid cells have been analyzed by flow cytometric techniques. Mimosine, a plant amino acid, reversibly blocks the cell cycle at a point which occurs roughly 2 h before the arrest mediated by aphidicolin, an inhibitor of DNA polymerase alpha activity, which defines the G1/S phase boundary. The levels of thymidine kinase mRNA, which increase at the onset of S phase, are higher in cells blocked with aphidicolin than in cells treated with mimosine whereas the opposite results are obtained in the case of p53 mRNA levels, which are known to be maximal in the late G1 phase. These results indicate that mimosine inhibits cell cycle traverse in the late G1 phase prior to the onset of DNA synthesis and identifies a previously undefined reversible cell cycle arrest point.
Lalande
M
M
Howard Hughes Medical Institute, Boston, Massachusetts.
D016590:Aphidicolin; D002455:Cell Division / Q000187:drug effects; D002461:Cell Line, Transformed; D004257:DNA Polymerase II / Q000037:antagonists & inhibitors; D004224:Diterpenes / Q000494:pharmacology*; D005434:Flow Cytometry; D004854:Herpesvirus 4, Human; D006801:Humans; D007399:Interphase / Q000187:drug effects*; D007700:Kinetics; D008214:Lymphocytes / Q000166:cytology; D008898:Mimosine / Q000494:pharmacology*; D011728:Pyridones / Q000494:pharmacology*; D012333:RNA, Messenger / Q000378:metabolism; D013937:Thymidine Kinase / Q000235:genetics
D004224:Diterpenes; D011728:Pyridones; D012333:RNA, Messenger; D016590:Aphidicolin; D008898:Mimosine; D013937:Thymidine Kinase; D004257:DNA Polymerase II