Adenosine modifies the balance between membrane and soluble forms of Flt-1

Frederique Leonard, Yvan Devaux*, Melanie Vausort, Isabelle Ernens, Magali Rolland-Turner, Daniel R. Wagner

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

16 Citations (Scopus)

Abstract

VEGFR-1 (or Flt-1) exists under a sFlt-1 or a mFlt-1 form. sFlt-1 is antiangiogenic, and mFlt-1 is proangiogenic. The cardioprotective nucleoside Ado is proangiogenic, but its effects on Flt-1 are unknown and were tested in this study. In primary human macrophages from healthy volunteers, Ado inhibited sFlt-1 expression induced by LPS (-43%, P=0.006), HS, and IL-1β but not hypoxia. This effect was also observed in macrophages from patients with acute MI (-33%, P<0.001). It was reproduced by the A2A Ado receptor agonist CGS21680 and abrogated by the A2A antagonist SCH58261. Conversely, Ado increased mFlt-1 expression, thus switching sFlt-1 from the soluble toward the membrane form. This switch was also present in macrophages from acute MI patients (P<0.001). Assessment of HIF-1α nuclear translocation and activation together with siRNA experiments suggested that the effect of Ado on Flt-1 involves HIF-1α. In conclusion, Ado down-regulates sFlt-1 and up-regulates mFlt-1 production, an effect that indicates that Ado may be used to stimulate angiogenesis in the heart.

Original languageEnglish
Pages (from-to)199-204
Number of pages6
JournalJournal of Leukocyte Biology
Volume90
Issue number1
DOIs
Publication statusPublished - Jul 2011

Keywords

  • Hibernation
  • Macrophages
  • Receptors
  • sFlt-1

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