Shh controls epithelial proliferation via independent pathways that converge on N-Myc

Pleasantine Mill, Rong Mo, Ming C Hu, Lina Dagnino, Norman D. Rosenblum, Chi Chung Hui

Research output: Contribution to journalArticle

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Abstract

Shh signaling induces proliferation of many cell types during development and disease, but how Gli transcription factors regulate these mitogenic responses remains unclear. By genetically altering levels of Gli activator and repressor functions in mice, we have demonstrated that both Gli functions are involved in the transcriptional control of N-myc and Cyclin D2 during embryonic hair follicle development. Our results also indicate that additional Gli-activator-dependent functions are required for robust mitogenic responses in regions of high Shh signaling. Through posttranscriptional mechanisms, including inhibition of GSK3-β activity, Shh signaling leads to spatially restricted accumulation of N-myc and coordinated cell cycle progression. Furthermore, a temporal shift in the regulation of GSK3-β activity occurs during embryonic hair follicle development, resulting in a synergy with β-catenin signaling to promote coordinated proliferation. These findings demonstrate that Shh signaling controls the rapid and patterned expansion of epithelial progenitors through convergent Gli-mediated regulation.

Original languageEnglish (US)
Pages (from-to)293-303
Number of pages11
JournalDevelopmental Cell
Volume9
Issue number2
DOIs
StatePublished - Aug 2005

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Activator Appliances
Hair Follicle
Cyclin D2
Catenins
Cell Cycle
Transcription Factors
Cell Proliferation
Cells

ASJC Scopus subject areas

  • Developmental Biology

Cite this

Shh controls epithelial proliferation via independent pathways that converge on N-Myc. / Mill, Pleasantine; Mo, Rong; Hu, Ming C; Dagnino, Lina; Rosenblum, Norman D.; Hui, Chi Chung.

In: Developmental Cell, Vol. 9, No. 2, 08.2005, p. 293-303.

Research output: Contribution to journalArticle

Mill, Pleasantine ; Mo, Rong ; Hu, Ming C ; Dagnino, Lina ; Rosenblum, Norman D. ; Hui, Chi Chung. / Shh controls epithelial proliferation via independent pathways that converge on N-Myc. In: Developmental Cell. 2005 ; Vol. 9, No. 2. pp. 293-303.
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