Mechanism of the Tissue-Specific Action of the Selective Androgen Receptor Modulator S-101479

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概要

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• 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.

• 公益社団法人 日本薬学会の論文

著者

• Endo Yasuhisa

  Division Of Applied Biology Kyoto Institute Of Technology

• FURUYA Kazuyuki

  Central Research Laboratories, Kaken Pharmaceutical Co., Ltd.

• Yamamoto Noriko

  Central Research Laboratories Kaken Pharmaceutical Co. Ltd.

• Ohyabu Yuki

  Central Research Laboratories, Kaken Pharmaceutical Co., Ltd.

• Morikyu Teruyuki

  Central Research Laboratories, Kaken Pharmaceutical Co., Ltd.

• Ishige Hirohide

  Central Research Laboratories, Kaken Pharmaceutical Co., Ltd.

• Albers Michael

  Phenex Pharmaceuticals AG

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