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Expression of the TGF-??ALK-1 Pathway in Dura and the Outer Membrane of Chronic Subdural Hematomas #MMPMID24305026
Neurol Med Chir (Tokyo) 2014[May]; 54 (5): 357-62 PMID24305026show ga
Neovascularization of the outer membrane plays a critical role in the development and enlargement of chronic subdural hematomas (CSHs) and vascular endothelial growth factor (VEGF) may promote their progression. However, the precise mechanisms remain to be determined. We focused on the signaling pathway upstream of VEGF, transforming growth factor ? (TGF-?), and activin receptor-like kinase 1 (ALK-1) to identify the mechanisms underlying the neovascularization of the outer membrane of CSH. Retrospective comparative study was conducted on 15 consecutive patients diagnosed as CSH with burr-hole drainage. Dura and the outer membrane were collected. We immunohistochemically examined the expression of VEGF, integrin-?, TGF-?, and ALK-1 on the outer membrane and dura of CSH and compared our findings with control samples and the signal intensity of hematomas on computed tomography (CT) scans. VEGF and integrin-? expression was markedly up-regulated in both the dura and outer membrane of CSH, the expression of TGF-? and ALK-1 in the dura was slightly increased in the dura and markedly up-regulated in the outer membrane. There was no significant correlation between their expression and CT density. Here we first report the expression of TGF-? and ALK-1 in the outer membrane and dura mater of CSH. We suggest that the TGF-??ALK-1 pathway and VEGF affect neovascularization and the progression of CSH.