Abstract
Estrogen plays important roles in the pathophysiology of atherosclerosis and cardiovascular diseases mediated by estrogen receptor α (ERα). To elucidate the molecular mechanisms, we screened ERα-interacting proteins from a human heart cDNA library using a yeast two-hybrid system, and identified the four and a half of LIM-only protein 2 (FHL2). FHL2 interacted with ERα in the presence of 17β-estradiol, but not of tamoxifen or raloxifene in yeast. FHL2 mainly interacted with N-terminal A/B domain of ERα but not C-terminal ligand-binding domain. However, overexpression of full-length FHL2 did not affect ERα-dependent transcriptional activities of a reporter containing 3 copies of estrogen response element in COS-1 cells. Since tissue distribution of FHL2 was highly restricted to the heart, the function of FHL2 may be observed in a cell type- or promoter-specific manner. We have also detected strong interactions of ERα with Ubc9 and PIAS1 in yeast. Ubc9 and PIAS1, small ubiquitin-related modifier-1 (SUMO-1) conjugating enzyme and ligase, respectively, markedly interacted with ERα in a 17β-estradiol-dependent manner. These proteins mainly interacted with the DNA-binding and ligand-binding domains of ERα. Overexpression of Ubc9 or PIAS1 potentiated ERα-mediated transcriptional activities in COS-1 cells in a dose-dependent manner, indicating that both Ubc9 and PIAS1 function as coactivators of ERα. In addition, the SUMOylation-defective mutant, Ubc9 (C93S) continued to enhance ERα-dependent transcriptional activities. These findings suggest that coactivator abilities and SUMOylation capacities of Ubc9 and PIAS1 are separable and distinct. The present studies indicate that ERα exhibit tissue-specific functions utilizing multiple tissue-restricted receptor-interacting proteins.
| Original language | English |
|---|---|
| Pages (from-to) | 617-621 |
| Number of pages | 5 |
| Journal | Endocrine Research |
| Volume | 30 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2004 |
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Keywords
- Coactivator
- ERα
- FHL2
- PIAS1
- Ubc9
ASJC Scopus subject areas
- Endocrinology
Cite this
FHL2, UBC9, and PIAS1 are novel estrogen receptor α-interacting proteins. / Kobayashi, Sakiko; Shibata, Hirotaka; Yokota, Kenichi; Suda, Noriko; Takeda, Ayano; Kurihara, Isao; Saito, Ikuo; Saruta, Takao.
In: Endocrine Research, Vol. 30, No. 4, 2004, p. 617-621.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - FHL2, UBC9, and PIAS1 are novel estrogen receptor α-interacting proteins
AU - Kobayashi, Sakiko
AU - Shibata, Hirotaka
AU - Yokota, Kenichi
AU - Suda, Noriko
AU - Takeda, Ayano
AU - Kurihara, Isao
AU - Saito, Ikuo
AU - Saruta, Takao
PY - 2004
Y1 - 2004
N2 - Estrogen plays important roles in the pathophysiology of atherosclerosis and cardiovascular diseases mediated by estrogen receptor α (ERα). To elucidate the molecular mechanisms, we screened ERα-interacting proteins from a human heart cDNA library using a yeast two-hybrid system, and identified the four and a half of LIM-only protein 2 (FHL2). FHL2 interacted with ERα in the presence of 17β-estradiol, but not of tamoxifen or raloxifene in yeast. FHL2 mainly interacted with N-terminal A/B domain of ERα but not C-terminal ligand-binding domain. However, overexpression of full-length FHL2 did not affect ERα-dependent transcriptional activities of a reporter containing 3 copies of estrogen response element in COS-1 cells. Since tissue distribution of FHL2 was highly restricted to the heart, the function of FHL2 may be observed in a cell type- or promoter-specific manner. We have also detected strong interactions of ERα with Ubc9 and PIAS1 in yeast. Ubc9 and PIAS1, small ubiquitin-related modifier-1 (SUMO-1) conjugating enzyme and ligase, respectively, markedly interacted with ERα in a 17β-estradiol-dependent manner. These proteins mainly interacted with the DNA-binding and ligand-binding domains of ERα. Overexpression of Ubc9 or PIAS1 potentiated ERα-mediated transcriptional activities in COS-1 cells in a dose-dependent manner, indicating that both Ubc9 and PIAS1 function as coactivators of ERα. In addition, the SUMOylation-defective mutant, Ubc9 (C93S) continued to enhance ERα-dependent transcriptional activities. These findings suggest that coactivator abilities and SUMOylation capacities of Ubc9 and PIAS1 are separable and distinct. The present studies indicate that ERα exhibit tissue-specific functions utilizing multiple tissue-restricted receptor-interacting proteins.
AB - Estrogen plays important roles in the pathophysiology of atherosclerosis and cardiovascular diseases mediated by estrogen receptor α (ERα). To elucidate the molecular mechanisms, we screened ERα-interacting proteins from a human heart cDNA library using a yeast two-hybrid system, and identified the four and a half of LIM-only protein 2 (FHL2). FHL2 interacted with ERα in the presence of 17β-estradiol, but not of tamoxifen or raloxifene in yeast. FHL2 mainly interacted with N-terminal A/B domain of ERα but not C-terminal ligand-binding domain. However, overexpression of full-length FHL2 did not affect ERα-dependent transcriptional activities of a reporter containing 3 copies of estrogen response element in COS-1 cells. Since tissue distribution of FHL2 was highly restricted to the heart, the function of FHL2 may be observed in a cell type- or promoter-specific manner. We have also detected strong interactions of ERα with Ubc9 and PIAS1 in yeast. Ubc9 and PIAS1, small ubiquitin-related modifier-1 (SUMO-1) conjugating enzyme and ligase, respectively, markedly interacted with ERα in a 17β-estradiol-dependent manner. These proteins mainly interacted with the DNA-binding and ligand-binding domains of ERα. Overexpression of Ubc9 or PIAS1 potentiated ERα-mediated transcriptional activities in COS-1 cells in a dose-dependent manner, indicating that both Ubc9 and PIAS1 function as coactivators of ERα. In addition, the SUMOylation-defective mutant, Ubc9 (C93S) continued to enhance ERα-dependent transcriptional activities. These findings suggest that coactivator abilities and SUMOylation capacities of Ubc9 and PIAS1 are separable and distinct. The present studies indicate that ERα exhibit tissue-specific functions utilizing multiple tissue-restricted receptor-interacting proteins.
KW - Coactivator
KW - ERα
KW - FHL2
KW - PIAS1
KW - Ubc9
UR - http://www.scopus.com/inward/record.url?scp=11244261390&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=11244261390&partnerID=8YFLogxK
U2 - 10.1081/ERC-200043789
DO - 10.1081/ERC-200043789
M3 - Article
C2 - 15666801
AN - SCOPUS:11244261390
VL - 30
SP - 617
EP - 621
JO - Endocrine Research
JF - Endocrine Research
SN - 0743-5800
IS - 4
ER -