| RRC ID |
61801
|
| 著者 |
Furuya K, Yamamoto N, Ohyabu Y, Morikyu T, Ishige H, Albers M, Endo Y.
|
| タイトル |
Mechanism of the tissue-specific action of the selective androgen receptor modulator S-101479.
|
| ジャーナル |
Biol Pharm Bull
|
| Abstract |
Selective androgen receptor modulators (SARMs) comprise a new class of molecules that induce anabolic effects with fewer side effects than those of other anabolic agents. We previously reported that the novel SARM S-101479 had a tissue-selective bone anabolic effect with diminished side effects in female animals. However, the mechanism of its tissue selectivity is not well known. In this report, we show that S-101479 increased alkaline phosphatase activity and androgen receptor (AR) transcriptional activity in osteoblastic cell lines in the same manner as the natural androgen ligand dihydrotestosterone (DHT); conversely, stimulation of AR dimerization was very low compared with that of DHT (34.4%). S-101479 increased bone mineral content in ovariectomized rats without promoting endometrial proliferation. Yeast two-hybrid interaction assays revealed that DHT promoted recruitment of numerous cofactors to AR such as TIF2, SRC1, β-catenin, NCoA3, gelsolin and PROX1 in a dose-dependent manner. SARMs induced recruitment of fewer cofactors than DHT; in particular, S-101479 failed to induce recruitment of canonical p160 coactivators such as SRC1, TIF2 and notably NCoA3 but only stimulated binding of AR to gelsolin and PROX1. The results suggest that a full capability of the AR to dimerize and to effectively and unselectively recruit all canonical cofactors is not a prerequisite for transcriptional activity in osteoblastic cells and resulting anabolic effects in bone tissues. Instead, few relevant cofactors might be sufficient to promote AR activity in these tissues.
|
| 巻・号 |
36(3)
|
| ページ |
442-51
|
| 公開日 |
2013-1-1
|
| DOI |
10.1248/bpb.b12-00885
|
| PII |
DN/JST.JSTAGE/bpb/b12-00885
|
| PMID |
23449329
|
| MeSH |
Animals
Benzofurans / pharmacology*
Cell Differentiation / drug effects
Dihydrotestosterone / pharmacology
Female
Organ Specificity
Osteoblasts / cytology
Osteoblasts / drug effects
Ovariectomy
Protein Multimerization
Quinolines / pharmacology*
Rats
Rats, Sprague-Dawley
Receptors, Androgen / chemistry
Receptors, Androgen / drug effects*
Receptors, Androgen / genetics
Transcriptional Activation
|
| IF |
1.863
|
| リソース情報 |
| ヒト・動物細胞 |
MC3T3-E1(RCB1126) |
