Title : Overexpression of p21(waf1) decreases G2-M arrest and apoptosis induced by paclitaxel in human sarcoma cells lacking both p53 and functional Rb protein.

Pub. Date : 1999 Jun

PMID : 10347252






8 Functional Relationships(s)
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1 Overexpression of p21(waf1) decreases G2-M arrest and apoptosis induced by paclitaxel in human sarcoma cells lacking both p53 and functional Rb protein. Paclitaxel cyclin dependent kinase inhibitor 1A Homo sapiens
2 We examined the effect of overexpression of p21(waf1) on cytotoxicity of paclitaxel, a microtubule stabilizer, using a tetracycline-inducible expression system in human sarcoma cells (SaOs-2) that lack both functional retinoblastoma protein and p53. Paclitaxel cyclin dependent kinase inhibitor 1A Homo sapiens
3 Upon p21(waf1) induction by tetracycline withdrawal, we observed a reduced apoptotic response to paclitaxel with a 3- to 6-fold increase in IC50 values compared with that of cells not induced by p21(waf1). Paclitaxel cyclin dependent kinase inhibitor 1A Homo sapiens
4 After treatment with paclitaxel, less accumulation of G2-M was observed in p21(waf1)-induced cells compared with non-p21(waf1)-induced cells (57% versus 74%). Paclitaxel cyclin dependent kinase inhibitor 1A Homo sapiens
5 After treatment with paclitaxel, less accumulation of G2-M was observed in p21(waf1)-induced cells compared with non-p21(waf1)-induced cells (57% versus 74%). Paclitaxel cyclin dependent kinase inhibitor 1A Homo sapiens
6 p21(waf1) induction also inhibited the increased cyclin B1-associated kinase activity induced by paclitaxel. Paclitaxel cyclin dependent kinase inhibitor 1A Homo sapiens
7 Overexpression of p21(waf1) in SaOs-2 cells lacking both p53 and functional retinoblastoma protein may decrease the G2-M arrest induced by paclitaxel due to suppression of the S-G2 checkpoint, resulting in a decreased apoptotic response of cells to paclitaxel. Paclitaxel cyclin dependent kinase inhibitor 1A Homo sapiens
8 Overexpression of p21(waf1) in SaOs-2 cells lacking both p53 and functional retinoblastoma protein may decrease the G2-M arrest induced by paclitaxel due to suppression of the S-G2 checkpoint, resulting in a decreased apoptotic response of cells to paclitaxel. Paclitaxel cyclin dependent kinase inhibitor 1A Homo sapiens