Downregulation of uPAR promotes urokinase translocation into the nucleus and epithelial to mesenchymal transition in neuroblastoma.

Abstract:

:The urokinase system is involved in a variety of physiological processes, such as fibrinolysis, matrix remodeling, wound healing, and regeneration. Upon binding to its cognate receptor urokinase-type plasminogen activator receptor (uPAR), urokinase-type plasminogen activator (uPA) catalyzes the conversion of plasminogen to plasmin and the activation of matrix metalloproteases. Apart from this, uPA-uPAR interaction can lead to the activation of transcription factors, mitogen-activated protein kinase signaling pathways and RTK cascades. Elevated expression of uPA and uPAR is markedly associated with cancer progression and metastasis and correlates with a poor prognosis in clinics. Targeting the urokinase system has proved to be effective in experimental models in vitro and in vivo, however, in clinics the inhibition of the uPA/uPAR system has fallen short of expectations, suggesting that the question of the functional relevance of uPA/uPAR system is far from being moot. Recently, using CRISPR/Cas9 technology, we have shown that uPAR knockout decreases the proliferation of neuroblastoma Neuro2a cells in vitro. In the present study we demonstrate that uPAR expression is essential for maintaining the epithelial phenotype in Neuro2a cells and that uPAR silencing promotes epithelial-mesenchymal transition (EMT) and increased cell migration. Accordingly, uPAR knockout results in the downregulation of epithelial markers (E-cadherin, occludin, and claudin-5) and in the increase of mesenchymal markers (N-cadherin, α-smooth muscle actin, and interleukin-6). In search of the molecular mechanism underlying these changes, we identified uPA as a key component. Two key insights emerged as a result of this work: in the absence of uPAR, uPA is translocated into the nucleus where it is presumably involved in the activation of transcription factors (nuclear factor κB and Snail) resulting in EMT. In uPAR-expressing cells, uPAR functions as a uPA "trap" that binds uPA on the cell surface and promotes controlled uPA internalization and degradation in lysosomes.

journal_name

J Cell Physiol

authors

Semina EV,Rubina KA,Shmakova AA,Rysenkova KD,Klimovich PS,Aleksanrushkina NA,Sysoeva VY,Karagyaur MN,Tkachuk VA

doi

10.1002/jcp.29555

subject

Has Abstract

pub_date

2020-09-01 00:00:00

pages

6268-6286

issue

9

eissn

0021-9541

issn

1097-4652

journal_volume

235

pub_type

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