The role of sonic hedgehog-Gli2 pathway in the masculinization of external genitalia

Shinichi Miyagawa, Daisuke Matsumaru, Aki Murashima, Akiko Omori, Yoshihiko Satoh, Ryuma Haraguchi, Jun Motoyama, Taisen Iguchi, Naomi Nakagata, Chi Chung Hui, Gen Yamada

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Abstract

During embryogenesis, sexually dimorphic organogenesis is achieved by hormones produced in the gonad. The external genitalia develop from a single primordium, the genital tubercle, and their masculinization processes depend on the androgen signaling. In addition to such hormonal signaling, the involvement of nongonadal and locally produced masculinization factors has been unclear. To elucidate the mechanisms of the sexually dimorphic development of the external genitalia, series of conditional mutant mouse analyses were performed using several mutant alleles, particularly focusing on the role of hedgehog signaling pathway in this manuscript. We demonstrate that hedgehog pathway is indispensable for the establishment of male external genitalia characteristics. Sonic hedgehog is expressed in the urethral plate epithelium, and its signal is mediated through glioblastoma 2 (Gli2) in the mesenchyme. The expression level of the sexually dimorphic genes is decreased in the glioblastoma 2 mutant embryos, suggesting that hedgehog signal is likely to facilitate the masculinization processes by affecting the androgen responsiveness. In addition, a conditional mutation of Sonic hedgehog at the sexual differentiation stage leads to abnormal male external genitalia development. The current study identified hedgehog signaling pathway as a key factor not only for initial development but also for sexually dimorphic development of the external genitalia in coordination with androgen signaling.

Original languageEnglish
Pages (from-to)2894-2903
Number of pages10
JournalEndocrinology
Volume152
Issue number7
DOIs
Publication statusPublished - 2011 Jul

ASJC Scopus subject areas

  • Endocrinology

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    Miyagawa, S., Matsumaru, D., Murashima, A., Omori, A., Satoh, Y., Haraguchi, R., Motoyama, J., Iguchi, T., Nakagata, N., Hui, C. C., & Yamada, G. (2011). The role of sonic hedgehog-Gli2 pathway in the masculinization of external genitalia. Endocrinology, 152(7), 2894-2903. https://doi.org/10.1210/en.2011-0263