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Functional expression of CXCR4 (CD184) on small-cell lung cancer cells mediates migration, integrin activation, and adhesion to stromal cells.

Abstract：

:Small-cell lung cancer (SCLC) is an aggressive, rapidly metastasizing neoplasm. The chemokine stromal cell-derived factor-1 (SDF-1/CXCL12) is constitutively secreted by marrow stromal cells and plays a key role for homing of hematopoietic cells to the marrow. Here, we report that tumor cells from patients with SCLC express high levels of functional CXCR4 receptors for the chemokine CXCL12. Reverse transcriptase-polymerase chain reaction and flow cytometry demonstrated CXCR4 mRNA and CXCR4 surface expression in SCLC cell lines. Immunohistochemistry of primary tumor samples from SCLC patients revealed high expression of CXCR4. CXCL12 elicited CXCR4 receptor endocytosis, actin polymerization, and a robust activation of phospho-p44/42 mitogen-activated protein kinase in SCLC cells. Furthermore, CXCL12 induced SCLC cell invasion into extracellular matrix and firm adhesion to marrow stromal cells. Stromal cell adhesion of SCLC cells was significantly inhibited by the specific CXCR4 antagonist T140, pertussis toxin, antivascular cell adhesion molecule-1(VCAM-1) antibodies, and CS-1 peptide, demonstrating the importance of CXCR4 chemokine receptor activation and alpha4beta1 integrin binding, respectively. In addition, CXCL12 enhanced the adhesion of SCLC cells to immobilized VCAM-1, demonstrating that CXCR4 chemokine receptors can induce integrin activation on SCLC cells. As SCLC has a high propensity for bone marrow involvement, our findings suggest that CXCR4 chemokine receptors and alpha4beta1 integrins play a critical role in the interaction of SCLC cells with stromal cells in the tumor microenvironment.

journal_name

Oncogene

journal_title

Oncogene

authors

Burger M,Glodek A,Hartmann T,Schmitt-Gräff A,Silberstein LE,Fujii N,Kipps TJ,Burger JA

doi

10.1038/sj.onc.1207097

subject

Has Abstract

pub_date

2003-11-06 00:00:00

pages

8093-101

issue

50

eissn

0950-9232

issn

1476-5594

pii

1207097

journal_volume

22

pub_type

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