PTHrP promotes colon cancer cell migration and invasion in an integrin α6β4-dependent manner through activation of Rac1

被引：21
作者：
Mula, Ramanjaneya V. [1 ]
Bhatia, Vandanajay [1 ]
Falzon, Miriam [1 ,2 ]
机构：
[1] Univ Texas Galveston, Med Branch, Dept Pharmacol & Toxicol, Galveston, TX 77555 USA
[2] Univ Texas Galveston, Med Branch, Sealy Ctr Canc Cell Biol, Galveston, TX 77555 USA
来源：
CANCER LETTERS | 2010年 / 298卷 / 01期
关键词：
PTHrP; Integrin alpha 6 beta 4; Phosphatidylinositol; 3-kinase; Tiam1; Rac1; HORMONE-RELATED PROTEIN; EXCHANGE FACTOR TIAM1; RHO-FAMILY GTPASES; ALPHA(6)BETA(4) INTEGRIN; EXPRESSION; KINASE; SURVIVAL; ADHESION; PROLIFERATION; METASTASIS;
D O I：
10.1016/j.canlet.2010.06.009
中图分类号：
R73 [肿瘤学];
学科分类号：
100214 ;
摘要：
Parathyroid hormone-related protein (PTHrP) is expressed by human colon cancer tissue and cell lines. Rac1 GTPase enhances colon cancer cell migration and invasion. Here we report a positive correlation between PTHrP expression and Rac1 activity in LoVo (human colon cancer) cells. The positive effects of PTHrP on Rac1 activity and on cell migration and invasion are mediated via the guanine nucleotide exchange factor Tiam1. Knockdown of integrin alpha 6 beta 4, which is upregulated by PTHrP, negates the PTHrP-mediated increase in Rac1 activation. Integrin alpha 6 beta 4 signals synergistically with growth factor receptors to activate the phosphatidylinositol 3-kinase (PI3-K) pathway. Chemical inhibition of PI3-K negates the PTHrP-mediated effects on Tiam1 and Rac1 activity. Tumors from PTHrP-over-expressing LoVo cells also show increased expression of Tiam1. Taken together, these observations provide evidence of a link between PTHrP and Rac1 activity through integrin awl, resulting in enhanced cell migration and invasion. Targeting PTHrP production in colon cancer may thus prove therapeutically beneficial. (C) 2010 Elsevier Ireland Ltd. All rights reserved.
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收藏
页码：119 / 127
页数：9
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