Abstract:
:Cerebral cavernous malformation (CCM) is a genetic, cerebrovascular disease. Familial CCM is caused by genetic mutations in KRIT1, CCM2, or PDCD10 Disease onset is earlier and more severe in individuals with PDCD10 mutations. Recent studies have shown that lesions arise from excess mitogen-activated protein kinase kinase kinase 3 (MEKK3) signaling downstream of Toll-like receptor 4 (TLR4) stimulation by lipopolysaccharide derived from the gut microbiome. These findings suggest a gut-brain CCM disease axis but fail to define it or explain the poor prognosis of patients with PDCD10 mutations. Here, we demonstrate that the gut barrier is a primary determinant of CCM disease course, independent of microbiome configuration, that explains the increased severity of CCM disease associated with PDCD10 deficiency. Chemical disruption of the gut barrier with dextran sulfate sodium augments CCM formation in a mouse model, as does genetic loss of Pdcd10, but not Krit1, in gut epithelial cells. Loss of gut epithelial Pdcd10 results in disruption of the colonic mucosal barrier. Accordingly, loss of Mucin-2 or exposure to dietary emulsifiers that reduce the mucus barrier increases CCM burden analogous to loss of Pdcd10 in the gut epithelium. Last, we show that treatment with dexamethasone potently inhibits CCM formation in mice because of the combined effect of action at both brain endothelial cells and gut epithelial cells. These studies define a gut-brain disease axis in an experimental model of CCM in which a single gene is required for two critical components: gut epithelial function and brain endothelial signaling.
journal_name
Sci Transl Medjournal_title
Science translational medicineauthors
Tang AT,Sullivan KR,Hong CC,Goddard LM,Mahadevan A,Ren A,Pardo H,Peiper A,Griffin E,Tanes C,Mattei LM,Yang J,Li L,Mericko-Ishizuka P,Shen L,Hobson N,Girard R,Lightle R,Moore T,Shenkar R,Polster SP,Roedel CJ,Lidoi
10.1126/scitranslmed.aaw3521subject
Has Abstractpub_date
2019-11-27 00:00:00issue
520eissn
1946-6234issn
1946-6242pii
11/520/eaaw3521journal_volume
11pub_type
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