کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2151398 | 1089989 | 2012 | 16 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Opposite Roles of Furin and PC5A in N-Cadherin Processing
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
تحقیقات سرطان
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Opposite Roles of Furin and PC5A in N-Cadherin Processing Opposite Roles of Furin and PC5A in N-Cadherin Processing](/preview/png/2151398.png)
چکیده انگلیسی
We recently demonstrated that lack of Furin-processing of the N-cadherin precursor (proNCAD) in highly invasive melanoma and brain tumor cells results in the cell-surface expression of a nonadhesive protein favoring cell migration and invasion in vitro. Quantitative polymerase chain reaction analysis of malignant human brain tumor cells revealed that of all proprotein convertases (PCs) only the levels of Furin and PC5A are modulated, being inversely (Furin) or directly (PC5A) correlated with brain tumor invasive capacity. Intriguingly, the N-terminal sequence following the Furin-activated NCAD site (RQKRâDW161, mouse nomenclature) reveals a second putative PC-processing site (RIRSDRâDK189) located in the first extracellular domain. Cleavage at this site would abolish the adhesive functions of NCAD because of the loss of the critical Trp161. This was confirmed upon analysis of the fate of the endogenous prosegment of proNCAD in human malignant glioma cells expressing high levels of Furin and low levels of PC5A (U343) or high levels of PC5A and negligible Furin levels (U251). Cellular analyses revealed that Furin is the best activating convertase releasing an â¼17-kDa prosegment, whereas PC5A is the major inactivating enzyme resulting in the secretion of an â¼20-kDa product. Like expression of proNCAD at the cell surface, cleavage of the NCAD molecule at RIRSDRâDK189 renders the U251 cancer cells less adhesive to one another and more migratory. Our work modifies the present view on posttranslational processing and surface expression of classic cadherins and clarifies how NCAD possesses a range of adhesive potentials and plays a critical role in tumor progression.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Neoplasia - Volume 14, Issue 10, October 2012, Pages 880-892, IN1-IN3
Journal: Neoplasia - Volume 14, Issue 10, October 2012, Pages 880-892, IN1-IN3
نویسندگان
Deborah Maret, Mohamad Seyed Sadr, Emad Seyed Sadr, David R Colman, Rolando F Del Maestro, Nabil G Seidah,