Expression and tyrosine phosphorylation of EMS1 in human breast cancer cell lines.

Abstract:

:The EMS1 gene encodes an 80/85 kDa c-src substrate and localises with the CCND1 gene to chromosome 11q13. This locus is amplified in approximately 13% of human breast cancers. EMS1 gene amplification and expression were characterised in a panel of human breast cancer cell lines to determine at what levels expression is regulated. The degree of tyrosine phosphorylation of EMS1 protein was also determined and compared with the activity of src-family kinases. The EMS1 gene was amplified in 6 of 20 cell lines investigated: MDA-MB-134, -157, -175, -453, ZR-75-1 and MCF-7. In the MDA-MB-157 and MCF-7 cell lines, EMS1 was amplified in the absence of CCND1 gene amplification. EMS1 protein levels were increased relative to normal breast epithelial cells in 6 cell lines (ZR-75-1, MDA-MB-134, -175, 453, MCF-7 and BT-474). Of these, BT-474 is the only cell line that does not exhibit EMS1 amplification or increased EMS1 mRNA levels. EMS1 tyrosine phosphorylation was 3-fold higher in BT-474 and T-47D cells, which exhibited relatively high total src activity coupled with expression of both c-fyn and c-yes, than in MDA-MB-453 cells, which expressed only c-yes. Our results therefore demonstrate gene amplification to be the predominant mechanism underlying EMS1 over-expression in human breast cancer cell lines and identify tyrosine phosphorylation as a further level at which regulation of this protein may be perturbed.

journal_name

Int J Cancer

authors

Campbell DH,deFazio A,Sutherland RL,Daly RJ

doi

10.1002/(SICI)1097-0215(19961115)68:4<485::AID-IJC

subject

Has Abstract

pub_date

1996-11-15 00:00:00

pages

485-92

issue

4

eissn

0020-7136

issn

1097-0215

pii

10.1002/(SICI)1097-0215(19961115)68:4<485::AID-IJC

journal_volume

68

pub_type

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