NDLI: Opposite Roles of Furin and PC5A in N-Cadherin Processing1 2

Content Provider	PubMed Central
Author	Maret, Deborah Sadr, Mohamad Seyed Sadr, Emad Seyed Colman, David R. Maestro, Rolando F. Del Seidah, Nabil G.
Copyright Year	2012
Abstract	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 (RQKR↓D W 161, mouse nomenclature) reveals a second putative PC-processing site (RIRSDR↓DK189) 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 ∼17-kDa prosegment, whereas PC5A is the major inactivating enzyme resulting in the secretion of an ∼20-kDa product. Like expression of proNCAD at the cell surface, cleavage of the NCAD molecule at RIRSDR↓DK189 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.
Starting Page	880
File Format	PDF
ISSN	14765586
e-ISSN	14765586
Journal	Neoplasia (New York, N.Y.)
Issue Number	10
Volume Number	14
Language	English
Publisher	Neoplasia Press Inc.
Publisher Date	2012-10-01
Access Restriction	Open
Rights Holder	Neoplasia Press Inc.
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Cancer Research

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