[Relationship between estradiol and the mitogenic activated protein kinase signal transduction pathway].
OBJECTIVE
To discuss the relationship between estradiol and the mitogenic activated protein kinase signal transduction pathway and the expression of the MAPK in the MCF-7 breast cancer cell-line.


METHODS
Epithelial growth factor (EGF) and different concentration of estradiol to induce the expression of phosphospecific ERK1/2 (pERK1/2) in MCF-7 cell line was used and the expression of pERK1/2 with western-blotting was detected. Then antiestrogen ICI 182780 and MAPK inhibitor PD98059 to inhibit the expression of pERK1/2 was used. The cell cycle of MCF-7 was detected by FACS.


RESULTS
EGF could significantly induce the expression of pERK1/2. Estradiol could also induce the expression of pERK1/2, but the intensity was less than the induction of EGF. The percentage of cells in the G(2)/M cell cycle after estradiol induction increased (18.38%) compared to the control group (10.52%) (P < 0.05).


CONCLUSIONS
MAPK is an important regulatory signal in breast cancer. Its measurement in breast cancer tissues provides information about the degree of activation of various growth factor pathways. This molecule may also provide a molecular target for compounds designed to block cell proliferation.
Chen
Jian-Ying
JY
Department of General Surgery, Union Hospital, Tongji Medical College, Huazhong Science and Technology University, Wuhan 430022, China.
Zhang
Bo
B
Wang
Guo-Bin
GB
Chen
Dao-da
DD
D001943:Breast Neoplasms / Q000201:enzymology / Q000473:pathology* / Q000503:physiopathology; D049109:Cell Proliferation / Q000187:drug effects*; D004958:Estradiol / Q000494:pharmacology*; D005260:Female; D006801:Humans; D020935:MAP Kinase Signaling System / Q000187:drug effects / Q000502:physiology*; D020928:Mitogen-Activated Protein Kinases / Q000187:drug effects / Q000378:metabolism*; D011960:Receptors, Estrogen / Q000378:metabolism; D015398:Signal Transduction; D014407:Tumor Cells, Cultured
D011960:Receptors, Estrogen; D004958:Estradiol; D020928:Mitogen-Activated Protein Kinases