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Enhanced expression of lumican inhibited the attachment and growth of human embryonic kidney 293 cells.

Abstract：

:Lumican is a member of a small leucine-rich proteoglycan (SLRP) family and it regulates the assembly and diameter of collagen fibers in the extracellular matrix of various tissues. Lumican expression was reported in various kinds of tumor cells. Lumican inhibits the growth of melanoma cells, but the lumican in pancreatic cancer correlated with an advanced stage and retroperitoneal and duodenal invasion. In this study, we clarified whether the enhanced expression of lumican contributes to cellular attachment, growth, colony formation, migration and invasion. HEK 293 cell, stably transfected with lumican cDNA synthesized and secreted a 50 kDa lumican protein at high levels in culture medium. The cells showed a polygonal appearance with long projections and the degree of adhesion of the cells to fibronectin was lower than that of empty vector transfected control cells (mock cells). In contrast, the degree of adhesion of the cells to type I collagen was not different from that of mock cells. The expression levels of alpha5 integrin, the major integrin subunit for fibronectin, were lower in lumican-transfected HEK cells than in mock cells. Furthermore, lumican-transfected HEK cells showed reduced growth rates in vitro and did not form colonies in soft agar. Phosphorylation of AKT, extracellular signal-regulated kinase (ERK) 1/2 and mammalian target of rapamycin (mTOR) decreased in the lumican-transfected HEK cells. Cell migration and invasion were not altered in lumican-transfected HEK cells and mock cells. These findings indicate that the 50kDa lumican protein plays important roles in the inhibition of HEK cell attachment and growth, and it might inhibit the activation of integrin pathways.

journal_name

Exp Mol Pathol

journal_title

Experimental and molecular pathology

authors

Ishiwata T,Yamamoto T,Kawahara K,Kawamoto Y,Matsuda Y,Ishiwata S,Naito Z

doi

10.1016/j.yexmp.2010.01.010

subject

Has Abstract

pub_date

2010-06-01 00:00:00

pages

363-70

issue

3

eissn

0014-4800

issn

1096-0945

pii

S0014-4800(10)00026-2

journal_volume

88

pub_type

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