p21Waf1/Cip1/Sdi1-induced growth arrest is associated with depletion of mitosis-control proteins and leads to abnormal mitosis and endoreduplication in recovering cells.
Induction of a cyclin-dependent kinase inhibitor p21Waf1/ Cip1/Sdi1 is an integral part of cell growth arrest associated with senescence and damage response. p21 overexpression from an inducible promoter resulted in senescence-like growth arrest in a human fibrosarcoma cell line. After release from p21-induced growth arrest, cells re-entered the cell cycle but displayed growth retardation, cell death and decreased clonogenicity. The failure to form colonies was associated with abnormal mitosis and endoreduplication in the recovering cells and was correlated with the induced level of p21 and the duration of p21 induction. p21 induction was found to inhibit the expression of multiple proteins involved in the execution and control of mitosis. p21-induced depletion of the cellular pools of mitosis-control proteins was followed by asynchronous resynthesis of such proteins after release from p21, which explains the observed mitotic abnormalities. Genetic destabilization in cells recovering from p21-induced growth arrest may conceivably play a role in carcinogenesis and tumor progression.
Chang
B D
BD
Department of Molecular Genetics (M/C 669), University of Illinois at Chicago, 60607-7170, USA.
Broude
E V
EV
Fang
J
J
Kalinichenko
T V
TV
Abdryashitov
R
R
Poole
J C
JC
Roninson
I B
IB
D001324:Autoantigens; D016203:CDC2 Protein Kinase / Q000235:genetics / Q000378:metabolism; D002135:Calcium-Binding Proteins / Q000235:genetics / Q000378:metabolism; D002352:Carrier Proteins; D018797:Cell Cycle Proteins; D002455:Cell Division; D000076247:Centromere Protein A; D002868:Chromosomal Proteins, Non-Histone / Q000378:metabolism*; D019926:Cyclin B / Q000235:genetics / Q000378:metabolism*; D056744:Cyclin B1; D050759:Cyclin-Dependent Kinase Inhibitor p21; D016213:Cyclins / Q000187:drug effects / Q000235:genetics / Q000378:metabolism*; D004247:DNA / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D005354:Fibrosarcoma / Q000188:drug therapy / Q000473:pathology; D005456:Fluorescent Dyes / Q000032:analysis / Q000378:metabolism; D005656:Fungal Proteins / Q000235:genetics / Q000378:metabolism; D006801:Humans; D007544:Isopropyl Thiogalactoside / Q000494:pharmacology; D008840:Microfilament Proteins; D008938:Mitosis; D009687:Nuclear Proteins; D009930:Organic Chemicals; D011494:Protein Kinases / Q000235:genetics / Q000378:metabolism; D017346:Protein Serine-Threonine Kinases; D011518:Proto-Oncogene Proteins; D014407:Tumor Cells, Cultured; D000097869:Polo-Like Kinase 1
D001324:Autoantigens; D016203:CDC2 Protein Kinase; D002135:Calcium-Binding Proteins; D002352:Carrier Proteins; D018797:Cell Cycle Proteins; D000076247:Centromere Protein A; D002868:Chromosomal Proteins, Non-Histone; D019926:Cyclin B; D056744:Cyclin B1; D050759:Cyclin-Dependent Kinase Inhibitor p21; D016213:Cyclins; D004247:DNA; D005456:Fluorescent Dyes; D005656:Fungal Proteins; D007544:Isopropyl Thiogalactoside; D008840:Microfilament Proteins; D009687:Nuclear Proteins; D009930:Organic Chemicals; D011494:Protein Kinases; D017346:Protein Serine-Threonine Kinases; D011518:Proto-Oncogene Proteins; D000097869:Polo-Like Kinase 1; C534699:CCNB1 protein, human; C493956:CDKN1A protein, human; C067882:PKH2-GL; C094772:centromere protein F