Identification of thioredoxin-interacting protein 1 as a hypoxia-inducible factor 1alpha-induced gene in pancreatic cancer.

Abstract:

OBJECTIVE:To investigate the expression of thioredoxin-interacting protein (TXNIP) during hypoxia and its dependency on hypoxia-inducible factor 1alpha (HIF-1alpha) in pancreatic cancer cell lines. METHODS:MiaPaCa-2 pancreatic cancer cells were transiently transfected with siRNA to HIF-1alpha and TXNIP protein measured after growth in normoxia or hypoxia. In addition, HIF-1alpha dependency was assessed by transiently transfecting MiaPaCa-2 pancreatic cancer cells with HIF-1alpha with a mutated oxygen degradation domain resulting in stable HIF-1alpha expression in normoxic conditions. Panc-1 pancreatic cancer cells with low endogenous TXNIP expression were stably transfected with TXNIP, and cell survival and response to platinum cancer agents were tested. Quantitative immunohistochemistry was utilized to measure the expression of TXNIP and thioredoxin 1 in human pancreatic cancer tissues. RESULTS:Thioredoxin-interacting protein was induced during hypoxia in pancreatic cancer cells in a HIF-1alpha-dependent manner. Overexpression of TXNIP in the Panc-1 cells resulted in a higher basal apoptosis and increased sensitivity to cisplatin and oxaliplatin. A negative correlation was observed between TXNIP and thioredoxin 1 expression in human pancreatic cancer tissues. CONCLUSIONS:Thioredoxin-interacting protein, a putative tumor suppressor gene, is induced in response to hypoxia in a HIF-1alpha-dependent manner in pancreatic cancer cells, resulting in increased apoptosis and increased sensitivity to platinum anticancer therapy. Increased TXNIP may be a mechanism to counterbalance the prosurvival effects of HIF-1alpha.

journal_name

Pancreas

journal_title

Pancreas

authors

Baker AF,Koh MY,Williams RR,James B,Wang H,Tate WR,Gallegos A,Von Hoff DD,Han H,Powis G

doi

10.1097/MPA.0b013e31815929fe

subject

Has Abstract

pub_date

2008-03-01 00:00:00

pages

178-86

issue

2

eissn

0885-3177

issn

1536-4828

pii

00006676-200803000-00012

journal_volume

36

pub_type

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