Vascular abnormalities in mice lacking the endothelial gap junction proteins connexin37 and connexin40

Alexander M. Simon, Andrea R. McWhorter

Research output: Contribution to journalArticlepeer-review

170 Scopus citations


Cells within the vascular wall are coupled by gap junctions, allowing for direct intercellular transfer of low molecular weight molecules. Although gap junctions are believed to be important for vascular development and function, their precise roles are not well understood. Mice lacking either connexin37 (Cx37) or connexin40 (Cx40), the predominant gap junction proteins present in vascular endothelium, are viable and exhibit phenotypes that are largely non-blood vessel related. Since Cx37 and Cx40 are coexpressed in endothelial cells and could overlap functionally, some roles of junctional communication may only be revealed by the elimination of both connexins. In this study, we interbreed Cx37 and Cx40 knockout mice to generate Cx37-/-Cx40-/-animals and show that they display severe vascular abnormalities and die perinatally. Cx37-/-Cx40-/-animals exhibit localized hemorrhages in skin, testis, gastrointestinal tissues, and lungs, with pronounced blood vessel dilatation and congestion occurring in some areas. Vascular anomalies were particularly striking in testis and intestine. In testis, abnormal vascular channels were present, with these channels coalescing into a cavernous, endothelium-lined blood pool resembling a hemangioma. These results provide evidence of a critical role for endothelial gap junction-mediated communication in the development and/or functional maintenance of segments of the mouse vasculature.

Original languageEnglish (US)
Pages (from-to)206-220
Number of pages15
JournalDevelopmental biology
Issue number2
StatePublished - 2002
Externally publishedYes


  • Connexin
  • Endothelium
  • Gap junction
  • Hemangioma
  • Hemorrhage
  • Intercellular communication
  • Vascular abnormality
  • Vascular malformation

ASJC Scopus subject areas

  • Molecular Biology
  • Developmental Biology
  • Cell Biology


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