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. 1993 Apr 15;90(8):3353–3357. doi: 10.1073/pnas.90.8.3353

In vivo inhibition of cyclin B degradation and induction of cell-cycle arrest in mammalian cells by the neutral cysteine protease inhibitor N-acetylleucylleucylnorleucinal.

S W Sherwood 1, A L Kung 1, J Roitelman 1, R D Simoni 1, R T Schimke 1
PMCID: PMC46298  PMID: 8386372

Abstract

The cytotoxic neutral cysteine protease inhibitor N-acetylleucylleucylnorleucinal (ALLN) inhibits cell-cycle progression in CHO cells, affecting the G1/S and metaphase-anaphase transition points, as well as S phase. Mitotic arrest induced by ALLN is associated with the inhibition of cyclin B degradation. At mitosis-inhibiting concentrations of ALLN, cells undergo nuclear-envelope breakdown, spindle formation, chromosome condensation, and congression to the metaphase plate. However, normal anaphase events do not occur, and cells arrest in a metaphase configuration for a prolonged period. Steady-state levels of cyclin B increase to greater than normal mitotic levels, and cyclin B is not degraded for an extended period. Histone H1 kinase activity remains elevated during mitotic arrest. Duration of mitotic arrest depends on ALLN concentration; high concentrations (> 50 micrograms/ml) produce a prolonged mitotic arrest, whereas at lower concentrations, cells are transiently delayed through mitosis (up to 4-12 hr), after which they undergo aberrant cell division resulting in randomly sized daughter cells containing variable amounts of DNA. Cyclin B degradation fails to occur, and histone H1 kinase remains activated for the duration of mitotic arrest at all ALLN concentrations.

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