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Cerebral cavernous malformations form an anticoagulant vascular domain in humans and mice

Lopez-Ramirez, Miguel Alejandro; Pham, Angela; Girard, Romuald; Wyseure, Tine; Hale, Preston; Yamashita, Atsuki; Koskimäki, Janne; Polster, Sean; Saadat, Laleh; Romero, Ignacio A.; Esmon, Charles T.; Lagarrigue, Frederic; Awad, Issam A.; Mosnier, Laurent O. and Ginsberg, Mark H. (2019). Cerebral cavernous malformations form an anticoagulant vascular domain in humans and mice. Blood, 133(3) pp. 193–204.

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DOI (Digital Object Identifier) Link: https://doi.org/10.1182/blood-2018-06-856062
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Abstract

Cerebral cavernous malformations (CCM) are common brain vascular dysplasias prone to acute and chronic hemorrhage with significant clinical sequelae. The pathogenesis of recurrent bleeding in CCM is incompletely understood. Here we show that central nervous system (CNS) hemorrhage in CCM is associated with locally elevated expression of the anticoagulant endothelial receptors thrombomodulin (TM) and endothelial protein C receptor (EPCR). TM levels are increased in human CCM lesions and in the plasma of patients with CCMs. In mice, endothelial-specific genetic inactivation of Krit1 (Krit1ECKO) or Pdcd10 (Pdcd10ECKO), which cause CCM formation, result in increased levels of vascular TM and EPCR, and in enhanced generation of activated protein C (APC) on endothelial cells. Increased TM expression is due to upregulation of transcription factors KLF2 and KLF4 consequent to the loss of KRIT1 or PDCD10. Increased TM expression contributes to CCM hemorrhage, because genetic inactivation of one or two copies of the Thbd gene decreases brain hemorrhage in Pdcd10ECKO mice. Moreover, administration of blocking antibodies against TM and EPCR significantly reduced CCM hemorrhage in Pdcd10ECKO mice. Thus, a local increase in the endothelial co-factors that generate anticoagulant APC can contribute to bleeding in CCMs and plasma soluble TM may represent a biomarker for hemorrhagic risk in CCMs.

Item Type: Journal Item
Copyright Holders: 2018 American Society of Hematology
ISSN: 1528-0020
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Life, Health and Chemical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Health and Wellbeing PRA (Priority Research Area)
Item ID: 57780
Depositing User: Ignacio A Romero
Date Deposited: 20 Nov 2018 13:19
Last Modified: 23 May 2019 04:08
URI: http://oro.open.ac.uk/id/eprint/57780
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