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• W1963301059 endingPage "92" @default.
• W1963301059 startingPage "79" @default.
• W1963301059 abstract "The effects of the protein phosphatase inhibitor okadaic acid were examined using the pig kidney cell line LLC-PK. At relatively low concentrations of the inhibitor (8-40 nM), cells became blocked in a metaphase-like mitotic state beginning 6-8 h after initial treatment. Spindle microtubules were present throughout the period of the mitotic block, but were not stabilized since they remained sensitive to nocodazole depolymerization. With increasing length of the mitotic block chromosome alignment at the metaphase plate was disrupted and multipolar spindles developed. Cells continued to accumulate in mitosis for at least 24 h, indicating that at these low concentrations okadaic acid was not cytotoxic, but rather acted as a cytostatic agent. Upon release of the okadaic acid block, mitotic LLC-PK cells recovered and completed anaphase. After extended periods of treatment some cells were able to escape the okadaic acid-induced mitotic block. These cells were multinucleate and had undergone cytokinesis in the absence of chromosome segregation. At higher concentrations of okadaic acid (0.5-1.0 microM), mitosis was blocked within 30-60 min of treatment. However, within 90-120 min treated cells rounded up and detached from the monolayer, regardless of whether they were in interphase or mitosis. Cytoplasmic microtubules were depolymerized in the detached cells, and these cells could not recover from the cytotoxic effects of such high concentrations of okadaic acid. Thus, differential effects of the phosphatase inhibitor could be demonstrated, depending upon the concentration of okadaic acid applied to the cultures. The okadaic acid-induced mitotic blockage was probably due to the inhibition of a type 2A protein phosphatase that is involved in the transition from metaphase to anaphase." @default.
• W1963301059 created "2016-06-24" @default.
• W1963301059 creator A5001256746 @default.
• W1963301059 creator A5028621042 @default.
• W1963301059 date "1992-01-01" @default.
• W1963301059 modified "2023-10-18" @default.
• W1963301059 title "Inhibition of mitosis by okadaic acid: possible involvement of a protein phosphatase 2A in the transition from metaphase to anaphase" @default.
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• W1963301059 doi "https://doi.org/10.1242/jcs.101.1.79" @default.
• W1963301059 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/1314839" @default.
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