Stress chaperone GRP78/BiP confers chemoresistance to tumor-associated endothelial cells

Jenilyn J. Virrey, Dezheng Dong, Caryn Stiles, John B. Patterson, Ligaya Pen, Min Ni, Axel H. Schönthal, Thomas C. Chen, Florence M. Hofman, Amy S. Lee

Research output: Contribution to journalArticle

109 Citations (Scopus)

Abstract

The tumor vasculature is essential for tumor growth and survival and is a key target for anticancer therapy. Glioblastoma multiforme, the most malignant form of brain tumor, is highly vascular and contains abnormal vessels, unlike blood vessels in normal brain. Previously, we showed that primary cultures of human brain endothelial cells, derived from blood vessels of malignant glioma tissues (TuBEC), are physiologically and functionally different from endothelial cells derived from nonmalignant brain tissues (BEC) and are substantially more resistant to apoptosis. Resistance of TuBEC to a wide range of current anticancer drugs has significant clinical consequences as it represents a major obstacle toward eradication of residual brain tumor. We report here that the endoplasmic reticulum chaperone GRP78/BiP is generally highly elevated in the vasculature derived from human glioma specimens, both in situ in tissue and in vitro in primary cell cultures, compared with minimal GRP78 expression in normal brain tissues and blood vessels. Interestingly, TuBEC constitutively overexpress GRP78 without concomitant induction of other major unfolded protein response targets. Resistance of TuBEC to chemotherapeutic agents such as CPT-11, etoposide, and temozolomide can be overcome by knockdown of GRP78 using small interfering RNA or chemical inhibition of its catalytic site. Conversely, overexpression of GRP78 in BEC rendered these cells resistant to drug treatments. Our findings provide the proof of principle that targeting GRP78 will sensitize the tumor vasculature to chemotherapeutic drugs, thus enhancing the efficacy of these drugs in combination therapy for glioma treatment.

Original languageEnglish (US)
Pages (from-to)1268-1275
Number of pages8
JournalMolecular Cancer Research
Volume6
Issue number8
DOIs
StatePublished - Aug 1 2008

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Blood Vessels
Endothelial Cells
Glioma
irinotecan
temozolomide
Brain
Brain Neoplasms
Neoplasms
Pharmaceutical Preparations
Unfolded Protein Response
Primary Cell Culture
Residual Neoplasm
Etoposide
Glioblastoma
Combination Drug Therapy
Endoplasmic Reticulum
Small Interfering RNA
Catalytic Domain
Therapeutics
Apoptosis

ASJC Scopus subject areas

  • Molecular Biology
  • Cancer Research
  • Oncology

Cite this

Stress chaperone GRP78/BiP confers chemoresistance to tumor-associated endothelial cells. / Virrey, Jenilyn J.; Dong, Dezheng; Stiles, Caryn; Patterson, John B.; Pen, Ligaya; Ni, Min; Schönthal, Axel H.; Chen, Thomas C.; Hofman, Florence M.; Lee, Amy S.

In: Molecular Cancer Research, Vol. 6, No. 8, 01.08.2008, p. 1268-1275.

Research output: Contribution to journalArticle

Virrey, JJ, Dong, D, Stiles, C, Patterson, JB, Pen, L, Ni, M, Schönthal, AH, Chen, TC, Hofman, FM & Lee, AS 2008, 'Stress chaperone GRP78/BiP confers chemoresistance to tumor-associated endothelial cells', Molecular Cancer Research, vol. 6, no. 8, pp. 1268-1275. https://doi.org/10.1158/1541-7786.MCR-08-0060
Virrey, Jenilyn J. ; Dong, Dezheng ; Stiles, Caryn ; Patterson, John B. ; Pen, Ligaya ; Ni, Min ; Schönthal, Axel H. ; Chen, Thomas C. ; Hofman, Florence M. ; Lee, Amy S. / Stress chaperone GRP78/BiP confers chemoresistance to tumor-associated endothelial cells. In: Molecular Cancer Research. 2008 ; Vol. 6, No. 8. pp. 1268-1275.
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