Breast Cancer Research and Treatment

, Volume 59, Issue 1, pp 15–26 | Cite as

Overexpression of the glucose-regulated stress gene GRP78 in malignant but not benign human breast lesions

  • Patricia M. Fernandez
  • Sana O. Tabbara
  • Lisa K. Jacobs
  • Frank C. R. Manning
  • Theodore N. Tsangaris
  • Arnold M. Schwartz
  • Katherine A. Kennedy
  • Steven R. Patierno


The 78 kDa glucose-regulated stress protein GRP78 is induced by physiological stress conditions such as hypoxia, low pH, and glucose deprivation which often exist in the microenvironments of solid tumors. Activation of this stress pathway occurs in response to several pro-apoptotic stimuli. In vitro studies have demonstrated a correlation between induced expression of GRP78 and resistance to apoptotic death induced by topoisomerase II-directed drugs. We were interested in characterizing this protein in human breast lesions for potential implications in chemotherapeutic intervention. Surgical specimens of human breast lesions and paired normal tissues from the same patients were flash frozen for these studies. Total RNA and/or protein were extracted from these tissues and used in northern and/or western blot analyses, respectively, to quantify the relative expression of GRP78. Northern blot analysis indicated that 0/5 benign breast lesions, 3/5 estrogen receptor positive (ER+) breast tumors, and 6/9 estrogen receptor negative (ER−) breast tumors exhibited overexpression of GRP78 mRNA compared to paired normal tissues, with fold overexpressions ranging from 1.8 to 20. Western blot analyses correlated with these findings since 0/5 benign breast lesions, 4/6 ER+ breast tumors, and 3/3 ER− breast tumors overexpressed GRP78 protein with fold overexpressions ranging from 1.8 to 19. Immunohistochemical analysis of these tissues demonstrated that the expression of GRP78 was heterogeneous among the cells comprising different normal and malignant glands, but confirmed the overexpression of GRP78 in most of the more aggressive ER− tumors. These results suggest that some breast tumors exhibit adverse microenvironment conditions that induce the overexpression of specific stress genes that may play a role in resistance to apoptosis and decreased chemotherapeutic efficacy.

chemoresistance endoplasmic reticulum GRP78 human breast cancer 


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Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • Patricia M. Fernandez
    • 1
  • Sana O. Tabbara
    • 2
  • Lisa K. Jacobs
    • 3
  • Frank C. R. Manning
    • 1
  • Theodore N. Tsangaris
    • 4
  • Arnold M. Schwartz
    • 4
  • Katherine A. Kennedy
    • 1
  • Steven R. Patierno
    • 1
  1. 1.Department of PharmacologyThe George Washington University Medical CenterWashingtonUSA
  2. 2.Department of PathologyThe George Washington University Medical CenterWashingtonUSA
  3. 3.Department of SurgeryThe George Washington University Medical CenterWashingtonUSA
  4. 4.Department of Pathology, SurgeryThe George Washington University Medical CenterWashingtonUSA

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