Beaufort, N.* ; Scharrer, E.* ; Kremmer, E. ; Lux, V.* ; Ehrmann, M.* ; Huber, R.* ; Houlden, H.* ; Werring, D.* ; Haffner, C.* ; Dichgans, M.*
     
    
        
Cerebral small vessel disease-related protease HtrA1 processes latent TGF-β binding protein 1 and facilitates TGF-β signaling.
    
    
        
    
    
        
        Proc. Natl. Acad. Sci. U.S.A. 111, 16496-16501 (2014)
    
    
    
      
      
	
	    High temperature requirement protein A1 (HtrA1) is a primarily secreted serine protease involved in a variety of cellular processes including transforming growth factor β (TGF-β) signaling. Loss of its activity causes cerebral autosomal recessive arteriopathy with subcortical infarcts and leukoencephalopathy (CARASIL), an inherited form of cerebral small vessel disease leading to early-onset stroke and premature dementia. Dysregulated TGF-β signaling is considered to promote CARASIL pathogenesis, but the underlying molecular mechanisms are incompletely understood. Here we present evidence from mouse brain tissue and embryonic fibroblasts as well as patient skin fibroblasts for a facilitating role of HtrA1 in TGF-β pathway activation. We identify latent TGF-β binding protein 1 (LTBP-1), an extracellular matrix protein and key regulator of TGF-β bioavailability, as a novel HtrA1 target. Cleavage occurs at physiological protease concentrations, is prevented under HtrA1-deficient conditions as well as by CARASIL mutations and disrupts both LTBP-1 binding to fibronectin and its incorporation into the extracellular matrix. Hence, our data suggest an attenuation of TGF-β signaling caused by a lack of HtrA1-mediated LTBP-1 processing as mechanism underlying CARASIL pathogenesis.
	
	
	    
	
       
      
	
	    
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        Publication type
        Article: Journal article
    
 
    
        Document type
        Scientific Article
    
 
    
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        Keywords
        Ltbp-1 ; Extracellular Matrix ; Proteolysis ; Small Vessel Disease
    
 
    
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        Language
        english
    
 
    
        Publication Year
        2014
    
 
    
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        HGF-reported in Year
        2014
    
 
    
    
        ISSN (print) / ISBN
        0027-8424
    
 
    
        e-ISSN
        1091-6490
    
 
    
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	    Volume: 111,  
	    Issue: 46,  
	    Pages: 16496-16501 
	    Article Number: ,  
	    Supplement: ,  
	
    
 
    
        
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            National Academy of Sciences
        
 
        
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        Reviewing status
        Peer reviewed
    
 
     
    
        POF-Topic(s)
        30504 - Mechanisms of Genetic and Environmental Influences on Health and Disease
    
 
    
        Research field(s)
        Immune Response and Infection
    
 
    
        PSP Element(s)
        G-501793-001
    
 
    
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        Erfassungsdatum
        2014-11-07