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© 2004 Oxford University Press
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Connective Tissue Growth Factor and Its Role in Lung Adenocarcinoma Invasion and Metastasis
Affiliations of authors: Laboratory of Molecular and Cellular Toxicology, Institute of Toxicology (CCC, JLS, MLK), School of Medicine (STC), College of Medicine, National Taiwan University, Taipei, Taiwan; Departments of Internal Medicine (JYS), Pathology (YMJ), and Surgery (BZL), National Taiwan University Hospital, Taipei; Institute of Anatomy, School of Medicine, National Yang-Ming University, Taipei (YPC); Department of Internal Medicine, National Taiwan University Hospital, National Health Research Institutes, and Institute of Biomedical Sciences, Taipei (PCY).
Correspondence to: Min-Liang Kuo, PhD, Laboratory of Molecular and Cellular Toxicology, Institute of Toxicology, College of Medicine, National Taiwan University, No. 1, Sec. 1, Jen-Ai Rd., Taipei 100, Taiwan (e-mail: toxkml{at}ha.mc.ntu.edu.tw)
Background: Tumor invasion and metastasis cause most deaths in cancer patients. Connective tissue growth factor (CTGF), a secreted protein that binds to integrins, modulates the invasive behavior of certain human cancer cells, but few mechanistic details are known. We investigated the roles of CTGF and collapsin response mediator protein 1 (CRMP-1) in metastasis and invasion of human lung adenocarcinoma. Methods: We compared vector control-transfected cells with corresponding CTGF gene-transfected cells. Invasive activity was measured with a modified Boyden chamber assay, and metastatic activity was measured in an animal model. We used CTGF deletion mutants, CTGF and CRMP-1 antisense oligonucleotides, and anti-integrin and anti-CRMP-1 antibodies to investigate the functional relationship between CTGF and CRMP-1. Expression of CTGF protein in 78 lung adenocarcinoma specimens was investigated immunohistochemically. All statistical tests were two-sided. Results: Invasive (both P<.001) and metastatic (P<.001 and P= .003, respectively) activities were lower in cells that overexpress CTGF than in vector control cells. Expression of CRMP-1 was higher in CTGF-transfected clones than in vector control cells, and its level decreased after cells were treated with anti-integrin 
v
3 and v5 antibodies. Reduced levels of CRMP-1 protein after the transfection of CRMP-1-specific antisense oligonucleotides, but not sense oligonucleotides, increased the invasiveness of CTGF-transfected cells (mean numbers of invasive CTGF-transfected cells treated with 20 µM CRMP-1-specific sense and antisense oligonucleotides were 327 and 516 cells, respectively [difference = 189 cells, 95% confidence interval {CI} = 156 to 221 cells; P<.001]). The CT module of CTGF was the region primarily responsible for the increased expression of CRMP-1 and the inhibition of invasion (mean numbers of invasive cells expressing full-length CTGF and CT module-deleted mutant were 148 and 385 cells, respectively [difference = 237 cells, 95% CI = 208 to 266 cells; P<.001]). Reduced expression of CTGF in lung cancer specimens was statistically significantly associated with the risk of more advanced-stage disease (stages III and IV versus stages I and II; P= .001), lymph node metastasis (P = .014), and shorter survival (median survival with high levels of CTGF = 66.7 months and median survival for low levels = 18.2 months; difference = 48.5 months, 95% CI = 33.5 to 63.5 months; P = .02). Conclusion: CTGF inhibits metastasis and invasion of human lung adenocarcinoma by a CRMP-1-dependent mechanism.
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- Suppression of Metastasis—A New Function for Known Proteins
- Donald J. Vander Griend, Jonathan C. Berger, and Carrie W. Rinker-Schaeffer
J Natl Cancer Inst 2004 96: 344-345.[Extract] [Full Text] [PDF]
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