Defective extraembryonic angiogenesis in mice lacking LBP-1a, a member of the grainyhead family of transcription factors

Vishwas Parekh, Amy McEwen, Virginia Barbour, Yutaka Takahashi, Jerold E. Rehg, Stephen M. Jane, John M. Cunningham

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23 Citations (Scopus)


LBP-1a and CP2 are ubiquitously expressed members of the grainyhead transcription factor family, sharing significant sequence homology, a common DNA binding motif, and modulating a range of key regulatory and structural genes. We have reported previously that CP2-null mice are viable with no obvious abnormality. LBP-1a provides redundant function in this contest. We show here that mice lacking LBP-1a expression develop intrauterine growth retardation at embryonic day 10.5, culminating in death 1 day later. No focal intraembryonic cause for this CP2-independent defect is evident. In contrast, a significant reduction in the thickness of the labyrinthine layer of the placenta is observed in LBP-1a-/- animals. However, expression of trophoblast differentiation markers is unperturbed in this context, and complementation studies utilizing tetraploid wild-type cells failed to rescue or ameliorate the LBP-1a-/- phenotype, excluding a primary trophoblast defect. An explanation for these observations is provided by the prominent angiogenic defect observed in the mutant placentas. LBP-1a-/- allantoic blood vessels fail to penetrate deeply and branch into the complex embryonic vasculature characteristic of the normal placenta. Interestingly, a similar defect in angiogenesis is observed in the yolk sac vasculature, primary endothelial cell-lined capillary tubes, although present, failed to connect into a characteristic intricate vascular network. Collectively, these results demonstrate that LBP-1a plays a critical role in the regulation of estraembryonic angiogenesis.

Original languageEnglish
Pages (from-to)7113-7129
Number of pages17
JournalMolecular and Cellular Biology
Issue number16
Publication statusPublished - 1 Aug 2004
Externally publishedYes

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