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Apoptosis induced in BM13674 cells by these diverse agents was markedly inhibited by 1 \u03bcM okadaic acid, a tumour promoter that inhibits protein phosphatases 1 and 2A. This compound also inhibited the appearance of apoptosis in fresh human leukaemia cells that had been exposed to gamma\u2010radiation. The inhibition of apoptosis was confirmed using fluorescence microscopy and DNA gel electrophoresis. Dephosphorylation of a limited number of proteins was shown to be associated with apoptosis and okadaic acid prevented these dephosphorylations. Previous studies on the BM13674 cell line showed that an inhibitor of protein synthesis failed to prevent apoptosis in these cells. The present data provides further support that posttranslational modification of proteins, in particular, phosphorylation\/dephosphorylation status, plays an important role in inhibition\/activation of programmed cell death in different human cells after exposure to several cytotoxic agents. \u00a9 1992 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/jcp.1041530316","type":"journal-article","created":{"date-parts":[[2005,2,26]],"date-time":"2005-02-26T07:11:04Z","timestamp":1109401864000},"page":"550-556","source":"Crossref","is-referenced-by-count":64,"title":["Inhibition of apoptosis in human tumour cells by okadaic acid"],"prefix":"10.1002","volume":"153","author":[{"given":"Qizhong","family":"Song","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Glenn D.","family":"Baxter","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Eva M.","family":"Kovacs","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Duygu","family":"Findik","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Martin F.","family":"Lavin","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2005,2,4]]},"reference":[{"key":"e_1_2_1_2_1","doi-asserted-by":"crossref","first-page":"17323","DOI":"10.1016\/S0021-9258(17)44906-4","article-title":"Activation of internucleosomal DNA cleavage in human CEM lymphocytes by glucocorticoid and novobiotin","volume":"265","author":"Alnemri E. 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