Hif1α is required for osteoclast activation and bone loss in male osteoporosis

Toshimi Tando, Yuiko Sato, Kana Miyamoto, Mayu Morita, Tami Kobayashi, Atsushi Funayama, Arihiko Kanaji, Wu Hao, Ryuichi Watanabe, Takatsugu Oike, Masaya Nakamura, Morio Matsumoto, Yoshiaki Toyama, Takeshi Miyamoto

研究成果: Article査読

13 被引用数 (Scopus)

抄録

The number of osteoporosis patients is increasing not only in women but in men. Male osteoporosis occurs due to aging or androgen depletion therapies, leading to fractures. However, molecular mechanisms underlying male osteoporosis remain unidentified. Here, we show that hypoxia inducible factor 1 alpha (Hif1α) is required for development of testosterone deficiency-induced male osteoporosis. We found that in mice Hif1α protein accumulates in osteoclasts following orchidectomy (ORX) in vivo. In vitro, Hif1α protein accumulated in osteoclasts cultured in hypoxic conditions, but Hif1α protein rather than mRNA levels were suppressed by testosterone treatment, even in hypoxia. Administration of a Hif1α inhibitor to ORX mice abrogated testosterone deficiency-induced osteoclast activation and bone loss but did not alter osteoclast activities or bone phenotypes in sham-operated, testosterone-sufficient animals. We conclude that Hif1α protein accumulation due to testosterone-deficiency promotes development of male osteoporosis. Thus Hif1α protein could be targeted to inhibit pathologically-activated osteoclasts under testosterone-deficient conditions to treat male osteoporosis patients.

本文言語English
ページ(範囲)391-396
ページ数6
ジャーナルBiochemical and Biophysical Research Communications
470
2
DOI
出版ステータスPublished - 2016 2 5
外部発表はい

ASJC Scopus subject areas

  • 生物理学
  • 生化学
  • 分子生物学
  • 細胞生物学

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