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Estrogen receptor α (ERα) mediates 17β-estradiol (E2)-activated expression of HBO1.
- Source :
-
Journal of experimental & clinical cancer research : CR [J Exp Clin Cancer Res] 2010 Nov 01; Vol. 29, pp. 140. Date of Electronic Publication: 2010 Nov 01. - Publication Year :
- 2010
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Abstract
- Background: HBO1 (histone acetyltransferase binding to ORC1) is a histone acetyltransferase (HAT) which could exert oncogenic function in breast cancer. However, the biological role and underlying mechanism of HBO1 in breast cancer remains largely unknown. In the current study, we aimed to investigate the role of HBO1 in breast cancer and uncover the underlying molecular mechanism.<br />Methods: Immunohistochemistry was applied to detect HBO1 protein expression in breast cancer specimens (n=112). The expression of protein level was scored by integral optical density (IOD) for further statistical analyses using SPSS. Real-time PCR was used to simultaneously measure mRNA levels of HBO1. The HBO1 protein expression in breast cancer cells was confirmed by western blot.<br />Results: HBO1 was highly expressed in breast cancer tissues and significantly correlated with estrogen receptor α (ERα) (p<0.001) and progestational hormone (PR) (p=0.002). HBO1 protein level also correlated positively with histology grade in ERα positive tumors (p=0.016) rather than ERα negative tumors. 17β-estradiol (E2) could upregulate HBO1 gene expression which was significantly inhibited by ICI 182,780 or ERα RNAi. E2-increased HBO1 protein expression was significantly suppressed by treatment with inhibitor of MEK1/2 (U0126) in T47 D and MCF-7 cells.<br />Conclusions: HBO1 was an important downstream molecule of ERα, and ERK1/2 signaling pathway may involved in the expression of HBO1 increased by E2.
- Subjects :
- Blotting, Western
Breast Neoplasms genetics
Cell Line, Tumor
Estradiol genetics
Estrogen Receptor alpha genetics
Female
Gene Expression
Histone Acetyltransferases genetics
Humans
Immunohistochemistry
Mitogen-Activated Protein Kinase 1 genetics
Mitogen-Activated Protein Kinase 1 metabolism
Mitogen-Activated Protein Kinase 3 genetics
Mitogen-Activated Protein Kinase 3 metabolism
Receptors, Progesterone genetics
Receptors, Progesterone metabolism
Reverse Transcriptase Polymerase Chain Reaction
Signal Transduction physiology
Transfection
Breast Neoplasms metabolism
Estradiol metabolism
Estrogen Receptor alpha metabolism
Gene Expression Regulation, Neoplastic
Histone Acetyltransferases biosynthesis
Subjects
Details
- Language :
- English
- ISSN :
- 1756-9966
- Volume :
- 29
- Database :
- MEDLINE
- Journal :
- Journal of experimental & clinical cancer research : CR
- Publication Type :
- Academic Journal
- Accession number :
- 21040551
- Full Text :
- https://doi.org/10.1186/1756-9966-29-140