期刊
LABORATORY INVESTIGATION
卷 85, 期 6, 页码 780-788出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/labinvest.3700275
关键词
ADAMTS13; hepatic stellate cell; von Willebrand factor; metalloprotease
资金
- NHLBI NIH HHS [R01 HL062136-03, R01HL62136, R01 HL072876, R01 HL062136-06A2, R01 HL062136, R01HL72876] Funding Source: Medline
- NIDDK NIH HHS [R01 DK046952, P30-DK-41296, P30 DK041296, R01DK46952] Funding Source: Medline
ADAMTS13 is a circulating zinc metalloprotease that cleaves the hemostatic glycoprotein von Willebrand factor (VWF) in a shear-dependent manner. Deficiency in ADAMTS13, owing to genetic mutations or autoimmune inhibitors, causes thrombotic thrombocytopenic purpura (TPP). Northern blot analysis has shown that ADAMTS13 is expressed primarily in the liver. By using real-time RT-PCR, we confirmed that in mice the liver had the highest level of the ADAMTS13 transcript. To identify the liver cell-type-specific origin of ADAMTS13, we used in situ hybridization techniques to investigate the pattern of ADAMTS13 expression in the liver; analyzed the ADAMTS13 proteolytic activity in the culture media of fractionated liver cells; and confirmed ADAMTS13 expression with RT-PCR analysis and cloning of the mouse ADAMTS13 gene. The results revealed that ADAMTS13 was expressed primarily in cell fractions enriched in hepatic stellate cells. The mouse ADAMTS13 cloned from primary hepatic stellate cells was similar to its human counterpart in digesting VWF and was susceptible to suppression by EDTA or the IgG inhibitors of patients with TTP. Since hepatic stellate cells are believed to play a major role in the development of hepatic fibrosis and cirrhosis, the identification of the liver cell-type expressing ADAMTS13 will have important implications for understanding pathophysiological mechanisms regulating ADAMTS13 expression.
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