title: Hypoxia induced high expression of thioredoxin interacting protein (TXNIP) in non-small cell lung cancer and its prognostic effect.
abstract: Although associations between thioredoxin interacting protein (TXNIP) and cancers have been recognized, the effects of TXNIP on non-small cell lung cancer (NSCLC) prognosis remained to be determined in detail. In addition, while hypoxia is a key characteristic of tumor cell growth microenvironment, the effect of hypoxia on TXNIP expression is controversial. In this study, formaldehyde fixed and paraffin embedded (FFPE) samples of 70 NSCLC patients who underwent resection between January 2010 and December 2011 were obtained. Evaluation of TXNIP and hypoxia inducible factor-1α (HIF-1α) protein expression in FFPE samples was made by immunohistochemistry. By Kaplan-Meier method, patients with high TXNIP expression demonstrated a significantly shorter progression free survival (PFS) compared with those with low TXNIP expression (18.0 months, 95%CI: 11.7, 24.3 versus 23.0 months, 95%CI: 17.6, 28.4, P=0.02). High TXNIP expression level was also identified as an independent prognostic factor by Cox regression analysis (adjusted hazard ratio: 2.46; 95%CI: 1.08, 5.56; P=0.03). Furthermore, TXNIP expression was found to be significantly correlated with HIF- 1α expression (Spearman correlation=0.67, P=0.000). To further confirm correlations, we established a tumor cell hypoxic culture model. Expression of TXNIP was up-regulated in all three NSCLC cell lines (A549, SPC-A1, and H1299) under hypoxic conditions. This study suggests that hypoxia induces increased TXNIP expression in NSCLC and high TXNIP expression could be a poor prognostic marker.
authors: Department of Respiratory Medicine, the Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing, China E-mail : caihourong@yeah.net.
authors: Yan
authors: Y
authors: Li
authors: Li-Yun
authors: LY
authors: Miao
authors: Yong-Long
authors: YL
authors: Xiao
authors: Mei
authors: M
authors: Huang
authors: Min
authors: M
authors: Yu
authors: Kui
authors: K
authors: Meng
authors: Hou-Rong
authors: HR
authors: Cai
mesh_terms: D002289:Carcinoma, Non-Small-Cell Lung / Q000235:genetics* / Q000473:pathology*; D002352:Carrier Proteins / Q000235:genetics*; D045744:Cell Line, Tumor; D018572:Disease-Free Survival; D005260:Female; D020022:Genetic Predisposition to Disease / Q000235:genetics*; D006801:Humans; D000860:Hypoxia / Q000235:genetics; D051795:Hypoxia-Inducible Factor 1, alpha Subunit / Q000235:genetics; D008175:Lung Neoplasms / Q000235:genetics* / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D015854:Up-Regulation / Q000235:genetics
chemical_list: D002352:Carrier Proteins; D051795:Hypoxia-Inducible Factor 1, alpha Subunit; C486715:TXNIP protein, human