4.5 Article

Ablation of Indian Hedgehog in the Murine Uterus Results in Decreased Cell Cycle Progression, Aberrant Epidermal Growth Factor Signaling, and Increased Estrogen Signaling

Journal

BIOLOGY OF REPRODUCTION
Volume 82, Issue 4, Pages 783-790

Publisher

OXFORD UNIV PRESS INC
DOI: 10.1095/biolreprod.109.080259

Keywords

estrogen; implantation; Indian Hedgehog; mouse; uterus

Funding

  1. National Institutes of Health (NIH) [R01HD042311, R01HD057873, R01CA77530, R01AR50560, P50CA098258, 5T32HD07165]
  2. Susan G. Komen Award [BCTR0503763]
  3. Eunice Kennedy Shriver National Institute of Child Health and Human Development/NIH [U54HD0077495, U54HD28934]

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Conditional ablation of Indian hedgehog (Ihh) in the murine uterus results in mice that are sterile because of defects in embryo implantation. We performed microarray analysis on these mice at the time point at which the Ihh target genes are induced by the administration of exogenous hormone to mimic Day 3.5 of pregnancy. This analysis identified 863 genes altered by the conditional ablation of Ihh. Of these, genes that regulated the cell cycle were overrepresented. In addition, genes involved in epidermal growth factor (EGF) and estrogen (E2) signaling were found to be deregulated upon Ihh ablation. Furthermore, upon conditional ablation of Ihh, 15-mo-old mice exhibited hallmarks of estrogenized uteri, such as cystically dilated glands and hyalinized stroma. Thus, Ihh regulates embryo implantation by having an impact on the cell cycle, EGF signaling, and E2 signaling.

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