Cytoplasmic location of factor-inhibiting hypoxia-inducible factor is associated with an enhanced hypoxic response and a shorter survival in invasive breast cancer.

Abstract:

INTRODUCTION:Hypoxia-inducible factor (HIF)-1alpha levels in invasive breast carcinoma have been shown to be an adverse prognostic indicator. Cellular HIF-1alpha activity is regulated by factor-inhibiting hypoxia-inducible factor 1 (FIH-1). In hypoxia, FIH-1 hydroxylation of Asn803 within the C-terminal transactivation domain does not occur and HIF-1alpha forms a fully active transcriptional complex. The present study investigates the role of FIH-1 in invasive breast carcinoma and its correlation with hypoxia. METHODS:Microarrayed tissue cores from 295 invasive carcinomas were stained for FIH-1, for HIF-1alpha and for carbonic anhydrase 9. FIH-1 expression was correlated with standard clinicopathological parameters and with the expression of the surrogate hypoxic markers HIF-1alpha and carbonic anhydrase 9. RESULTS:FIH-1 was positive in 239/295 (81%) tumours, 42/295 (14%) exclusively in the nucleus and 54/295 (18%) exclusively in the cytoplasm. Exclusive nuclear FIH-1 expression was significantly inversely associated with tumour grade (P = 0.02) and risk of recurrence (P = 0.04), whereas exclusive cytoplasmic FIH-1 was significantly positively associated with tumour grade (P = 0.004) and carbonic anhydrase 9 expression (P = 0.02). Patients with tumours that excluded FIH-1 from the nucleus had a significantly shorter survival compared with those with exclusive nuclear expression (P = 0.02). Cytoplasmic FIH-1 expression was also an independent poor prognostic factor for disease-free survival. CONCLUSION:FIH-1 is widely expressed in invasive breast carcinoma. As with other HIF regulators, its association between cellular compartmentalization and the hypoxic response and survival suggests that tumour regulation of FIH-1 is an additional important mechanism for HIF pathway activation.

journal_name

Breast Cancer Res

authors

Tan EY,Campo L,Han C,Turley H,Pezzella F,Gatter KC,Harris AL,Fox SB

doi

10.1186/bcr1838

subject

Has Abstract

pub_date

2007-01-01 00:00:00

pages

R89

issue

6

eissn

1465-5411

issn

1465-542X

pii

bcr1838

journal_volume

9

pub_type

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