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OASIS modulates hypoxia pathway activity to regulate bone angiogenesis.

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OASIS protein interacts with hypoxia-inducible factor-1α (HIF-1α) to regulate gene expression involved in blood vessel formation during bone development. This OASIS-HIF-1α interaction is crucial for proper vascularization in bone tissue.

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Area of Science:

  • Molecular Biology
  • Endocrinology
  • Developmental Biology

Background:

  • OASIS/CREB3L1 is an endoplasmic reticulum-resident transcription factor vital for osteoblast differentiation.
  • Bone development relies on vascularization regulated by the hypoxia signaling pathway.

Purpose of the Study:

  • To investigate the crosstalk between OASIS and the hypoxia signaling pathway in bone development.
  • To elucidate the molecular mechanisms underlying OASIS-mediated regulation of angiogenesis.

Main Methods:

  • Reverse transcription polymerase chain reaction (RT-PCR) and real-time PCR to analyze gene expression.
  • Coimmunoprecipitation assays to determine protein-protein interactions.
  • Luciferase reporter assays to assess transcriptional activity.
  • Immunostaining and metatarsal angiogenesis assays to evaluate vascularization in vivo.

Main Results:

  • OASIS deficiency led to decreased expression of hypoxia-inducible factor-1α (HIF-1α) target genes, including vascular endothelial growth factor A (VEGFA).
  • The activated N-terminal fragment of OASIS (OASIS-N) directly binds to HIF-1α.
  • OASIS-N enhances the transcriptional activity of genes containing a hypoxia-response element (HRE).
  • OASIS-deficient osteoblasts showed reduced VEGFA expression, and Oasis(-/-) mice exhibited impaired bone vascularization.

Conclusions:

  • OASIS interacts with HIF-1α, influencing the expression of HIF-1α target genes.
  • The OASIS-HIF-1α complex plays a critical role in regulating angiogenesis during bone development.