Abstract:
BACKGROUND AND PURPOSE:The Heart of Glass (HEG) receptor binds KRIT1 and functions with KRIT1, CCM2, and PDCD10 in a common signaling pathway required for heart and vascular development. Mutations in KRIT1, CCM2, and PDCD10 also underlie human cerebral cavernous malformation (CCM) and postnatal loss of these genes in the mouse endothelium results in rapid CCM formation. Here, we test the role of HEG in CCM formation in mice and in humans. METHODS:We constitutively or conditionally deleted Heg and Ccm2 genes in genetically modified mice. Mouse embryos, brain, and retina tissues were analyzed to assess CCM lesion formation. RESULTS:In postnatal mice, CCMs form with Ccm2-/- but not with Heg-/- or Heg-/-;Ccm2+/- endothelial cells. Consistent with these findings, human patients with CCM who lack exonic mutations in KRIT1, CCM2, or PDCD10 do not have mutations in HEG. CONCLUSIONS:These findings suggest that the HEG-CCM signaling functions during cardiovascular development and growth, whereas CCMs arise because of loss of HEG-independent CCM signaling in the endothelium of the central nervous system after birth.
journal_name
Strokejournal_title
Strokeauthors
Zheng X,Riant F,Bergametti F,Myers CD,Tang AT,Kleaveland B,Pan W,Yang J,Tournier-Lasserve E,Kahn MLdoi
10.1161/STROKEAHA.114.004809subject
Has Abstractpub_date
2014-05-01 00:00:00pages
1505-1509issue
5eissn
0039-2499issn
1524-4628journal_volume
45pub_type
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