Clinical and biological significance of HSP89 alpha in human breast cancer.

Abstract:

:In order to isolate and characterize genes whose expression may be altered in breast malignancy, we screened a cDNA library with a polyclonal anti-serum against breast-cancer-metastasis membranes and isolated several immunopositive clones. One of these, AJ1, was analyzed in detail and found to be expressed at varying levels as a 3.3-kb mRNA in all of 143 breast cancers. High expression was associated with lymph-node involvement (p = 0.03). Comparison between high- and low-expressing groups showed a significant difference at 4 and 6 years for both overall (p = 0.004 and p = 0.002 respectively) and disease-free (p = 0.0001 and p = 0.04 respectively) survival, but not at 11 years. AJ1 was expressed at much lower levels in non-malignant biopsies as compared with malignant tissue (p = 0.001). Expression was observed in breast-cancer cell lines MCF-7, ZR-75-1, T47D, MDA-MB-231 and HBL 100. Partial sequence analysis of the 620 bp clone showed complete homology with human heat-shock protein 89 alpha. In addition to being heat-inducible in all the breast cell lines examined, AJ1 levels were increased by estradiol (blocked by cyclohexamide and tamoxifen), EGF, oxytocin and vasopressin in a time-dependent manner in MCF-7 cells and by estradiol, EGF, prolactin and hydrocortisone in T47D cells. In MDA-MB-231 cells, EGF caused down-regulation of AJ1 mRNA levels. The increasing evidence for the association of heat-shock proteins with steroid receptors suggests that AJ1 may play an important role in the control of estrogen-receptor transcriptional activity in breast cancers.

journal_name

Int J Cancer

authors

Jameel A,Skilton RA,Campbell TA,Chander SK,Coombes RC,Luqmani YA

doi

10.1002/ijc.2910500315

subject

Has Abstract

pub_date

1992-02-01 00:00:00

pages

409-15

issue

3

eissn

0020-7136

issn

1097-0215

journal_volume

50

pub_type

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