Altered shape and cell cycle characteristics of fibroblasts expressing the E2F1 transcription factor.
To gain an understanding of the role the E2F1 transcription factor plays in cell physiology, the full length protein (E2F1) and an amino terminal deletion of 87 amino acids (E2F1d87) were constitutively expressed in NIH3T3 fibroblasts. Multiple cell lines were generated for each construct. These cells do not proliferate in media containing low serum and do not proliferate in soft agar, indicating that they are likely not transformed. However, both sets of cell lines show increased DNA synthesis and increased numbers of cells in S phase when cultured in media containing low serum, compared to the control cell lines. Cells expressing E2F1d87 (but not E2F1) have an extremely rounded morphology when cultured in 10% serum-containing media. These rounded cells lack detectable microfilaments, microtubules, and focal contacts. However, when these cells are cultured in low serum-containing media (0.5%), they attain the flattened morphology and cytoskeletal structure of normal NIH3T3 cells.
Logan
T J
TJ
Department of Biochemistry and Molecular Biology, Thomas Jefferson University, Philadelphia, Pennsylvania 19107.
Jordan
K L
KL
Hall
D
D
D016475:3T3 Cells; D000199:Actins / Q000378:metabolism; D000818:Animals; D001483:Base Sequence; D002352:Carrier Proteins; D002453:Cell Cycle / Q000235:genetics / Q000502:physiology*; D018797:Cell Cycle Proteins; D002455:Cell Division / Q000235:genetics / Q000502:physiology; D048429:Cell Size / Q000235:genetics / Q000502:physiology*; D003470:Culture Media; D004247:DNA / Q000096:biosynthesis / Q000235:genetics; D004268:DNA-Binding Proteins; D050684:E2F Transcription Factors; D050687:E2F1 Transcription Factor; D015870:Gene Expression; D051379:Mice; D008870:Microtubules / Q000648:ultrastructure; D008969:Molecular Sequence Data; D016376:Oligonucleotides, Antisense / Q000235:genetics; D056465:Retinoblastoma-Binding Protein 1; D017384:Sequence Deletion; D016324:Sequence Tagged Sites; D050680:Transcription Factor DP1; D014157:Transcription Factors / Q000235:genetics / Q000502:physiology*; D016596:Vinculin / Q000378:metabolism
D000199:Actins; C533431:Arid4a protein, mouse; D002352:Carrier Proteins; D018797:Cell Cycle Proteins; D003470:Culture Media; D004268:DNA-Binding Proteins; D050684:E2F Transcription Factors; D050687:E2F1 Transcription Factor; C493754:E2f1 protein, mouse; D016376:Oligonucleotides, Antisense; D056465:Retinoblastoma-Binding Protein 1; D050680:Transcription Factor DP1; D014157:Transcription Factors; D016596:Vinculin; D004247:DNA