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Wang A.,Anhui Medical University | Wang A.,Anhui Provincial Hemophilia Treatment Center | Duan Q.,Anhui Provincial Hospital | Wu J.,Anhui Medical University | And 5 more authors.
Blood Coagulation and Fibrinolysis | Year: 2016

ADAMTS13, as a specific von Willebrand factor (VWF)-cleaving protease, prevents microvascular thrombosis of VWF/platelet thrombi. It has been reported that human vascular endothelial cells could also synthesize and secrete ADAMTS13, and these reports were focused in human umbilical vascular endothelial cells. Considering the particularity of its huge quantity and structure of human microvascular endothelial cells (HMECs) in the body, whether ADAMTS13 is expressed in HMECs also needs to be confirmed. To investigate whether ADAMTS13 is expressed in HMECs. Real-time PCR (RT-PCR) amplification detected ADAMTS13 mRNA in HMEC-1 cell line. The expression and distribution of ADAMTS13 protein and VWF were detected by fluorescence immunoassay and western blot. We observed the expression and distribution of ADAMTS13 in HMECs. We confirmed the expression of ADAMTS13 mRNA in HMEC-1, and found that there were some partly common distributions of ADAMTS13 protein and VWF. This study provides the evidence that HMECs also express ADAMTS13. HMECs might also be a primary source for human plasma ADAMTS13. The overlap region for the distribution of ADAMTS13 and VWF suggests that ADAMTS13 might have a potential regulation role for VWF inside cells. © 2016 Wolters Kluwer Health, Inc. All rights reserved. Source

Wang A.,Anhui Medical University | Wang A.,Anhui Provincial Hemophilia Treatment Center | Duan Q.,Anhui Medical University | Duan Q.,Anhui Provincial Hemophilia Treatment Center | And 6 more authors.
Microvascular Research | Year: 2015

Purpose: To better understand the antithrombotic property of All-trans retinoic acid (ATRA), we investigated whether ATRA may affect the balance between ADAMTS13 and von Willebrand factor (VWF) in human microvascular endothelial cell. Methods: Compared to tumor necrosis factor-alpha (TNF-α), we observed the effects of ATRA on the expression of ADAMTS13 and VWF. ADAMTS13mRNA in human microvascular endothelial cell (HMEC-1 cell line) were detected by real-time polymerase chain reaction amplification (RT-PCR). The levels of ADAMTS13 and VWF antigen were detected by western blot or enzyme-linked immunosorbent assay (ELISA), and the proteolytic activity of ADAMTS13 was also determined by using GST-VWF73-His peptide as a specific substrate. Results: ATRA significantly upregulated the expression of ADAMTS13mRNA in HMEC-1, while TNF-α inhibited ADAMTS13mRNA expression. ATRA could reverse the inhibition expression of ADAMTS13 by TNF-α. The results were confirmed from the levels of ADAMTS13 protein and its activity, while ATRA had no significant affection on triggering release of VWF. Conclusions: This study provides the evidence that ATRA modulates the balance of ADAMTS13 and VWF in human microvascular endothelial cell, which might be a very relevant compartment for the antithrombotic property of ATRA. © 2015 Elsevier Inc. Source

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