Linked Life Data

2052358

Source:http://linkedlifedata.com/resource/pubmed/id/2052358

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
1991-7-22
pubmed:abstractText
We have examined and quantitated the expression of c-myc protein in two untransformed fibroblast cell lines, murine Swiss 3T3 and human MRC-5, c-myc protein is not detectable in quiescent cells, but it is rapidly induced upon mitogenic stimulation. Peak expression is seen about 3-5 h after serum stimulation, and corresponds to about 3-6000 molecules per cell (mpc). Thereafter, levels fall back to a quiescent level in confluent fibroblasts, but remain elevated at 1-3000 mpc in subconfluent cells. The c-myc protein is phosphorylated and has the same size and short half-life as seen in tumour cells. Removal of serum growth factors from the culture medium causes very rapid loss of the c-myc protein from all cells, irrespective of their positions in the cell cycle. Thus, c-myc expression is continuously dependent upon the presence of mitogens. However, no single tested mitogen is obligatory for maintenance of expression in proliferating cells. Growth arrest of cells, either by metabolite starvation or by drugs which inhibit DNA synthesis, does not affect expression of the c-myc protein, which remains completely dependent upon the presence of mitogens. These data are consistent with the c-myc protein's having a continuous role in proliferating cells as an intracellular integrator of growth regulatory signalling pathways.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0950-9232
pubmed:author
pubmed:issnType
Print
pubmed:volume
6
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
797-805
pubmed:dateRevised
2004-11-17
pubmed:meshHeading
pubmed:year
1991
pubmed:articleTitle
c-myc protein expression in untransformed fibroblasts.
pubmed:affiliation
Imperial Cancer Research Fund Laboratories, London, UK.
pubmed:publicationType
Journal Article