Hypoxia‐induced pathways in breast cancer

Goonewardene, T.I.; Sowter, Heidi M.; Harris, Adrian L.

doi:10.1002/jemt.10175

Cited by 63 publications

(50 citation statements)

References 101 publications

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“…Antiangiogenesis therapy has shown that hypoxic regions can survive and repopulate the tumor after therapy (Yu et al, 2002). Hypoxic tumor cells are also more resistant to chemotherapy primarily due to the lack of an efficient way to deliver the drugs to these cells (Giatromanolaki and Harris, 2001;Koukourakis, 2001;Goonewardene et al, 2002). Radiation that relies on the formation of ROS to induce apoptosis is also ineffective in hypoxic cells due to the low rate of oxidative phosphorylation (Koukourakis, 2001).…”

Section: Discussionmentioning

confidence: 99%

BNIP3 plays a role in hypoxic cell death in human epithelial cells that is inhibited by growth factors EGF and IGF

Cizeau²,

et al. 2003

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Hypoxic regions within solid tumors are often resistant to chemotherapy and radiation. BNIP3 (Bcl-2/E1B 19 kDa interacting protein) is a proapoptotic member of the Bcl-2 family that is expressed in hypoxic regions of tumors. During hypoxia, BNIP3 expression is increased in many cell types and upon forced overexpression BNIP3 induces cell death. Herein, we have demonstrated that blockage of hypoxia-induced BNIP3 expression using antisense oligonucleotides against BNIP3 or blockage of BNIP3 function through expression of a mutant form of BNIP3 inhibits hypoxia-induced cell death in human embryonic kidney 293 cells. We have also determined that hypoxiamediated BNIP3 expression is regulated by the transcription factor, hypoxia-inducible factor-1a (HIF-1a) in human epithelial cell lines. Furthermore, HIF-1a directly binds to a consensus HIF-1a-responsive element (HRE) in the human BNIP3 promoter that upon mutation of this HRE site eliminates the hypoxic responsiveness of the promoter. Since BNIP3 is expressed in hypoxic regions of tumors but fails to induce cell death, we determined whether growth factors block BNIP3-induced cell death. Treatment of the breast cancer cell line MCF-7 cells with epidermal growth factor (EGF) or insulin-like growth factor effectively protected these cells from BNIP3-induced cell death. Furthermore, inhibiting EGF receptor signaling using antibodies against ErbB2 (Herceptin) resulted in increased hypoxia-induced cell death in MCF-7 cells. Taken together, BNIP3 plays a role in hypoxia-induced cell death in human epithelial cells that could be circumvented by growth factor signaling.

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Section: Discussionmentioning

confidence: 99%

BNIP3 plays a role in hypoxic cell death in human epithelial cells that is inhibited by growth factors EGF and IGF

Cizeau²,

et al. 2003

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“…However, tumor cells can adapt to hypoxic conditions by employing a variety of survival tools, which result in the promotion of cancer cell growth and metastasis. [1][2][3] This adaptation of cancer cells to hypoxia is mainly mediated by the transcription factor hypoxia-inducible factor-1 (HIF-1). 4 HIF-1 is a heterodimeric transcription factor consisting of an oxygen-regulated a subunit (HIF1a) and a stable nuclear factor, HIF-1b/aryl hydrocarbon receptor nuclear translocator (ARNT).…”

mentioning

confidence: 99%

The involvement of hypoxia‐inducible factor‐1α in the susceptibility to γ‐rays and chemotherapeutic drugs of oral squamous cell carcinoma cells

Sasabe

Zhou

et al. 2006

Intl Journal of Cancer

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The transcription factor hypoxia-inducible factor-1a (HIF-1a) is the key regulator that controls the hypoxic response of mammalian cells. The overexpression of HIF-1a has been demonstrated in many human tumors. However, the role of HIF-1a in the therapeutic efficacy of chemotherapy and radiotherapy in cancer cells is poorly understood. In this study, we investigated the influence of HIF-1a expression on the susceptibility of oral squamous cell carcinoma (OSCC) cells to chemotherapeutic drugs (cis-diamminedichloroplatinum and 5-fluorouracil) and c-rays. Treatment with chemotherapeutic drugs and c-rays enhanced the expression and nuclear translocation of HIF-1a, and the susceptibility of OSCC cells to the drugs and c-rays was negatively correlated with the expression level of HIF-1a protein. The overexpression of HIF-1a induced OSCC cells to become more resistant to the anticancer agents, and down-regulation of HIF-1a expression by small interfering RNA enhanced the susceptibility of OSCC cells to them. In the HIF-1a-knockdown OSCC cells, the expression of P-glycoprotein, heme oxygenase-1, manganese-superoxide dismutase and ceruloplasmin were downregulated and the intracellular levels of chemotherapeutic drugs and reactive oxygen species were sustained at higher levels after the treatment with the anticancer agents. These results suggest that enhanced HIF-1a expression is related to the resistance of tumor cells to chemo-and radio-therapy and that HIF-1a is an effective therapeutic target for cancer treatment. ' 2006 Wiley-Liss, Inc.Key words: hypoxia-inducible factor-1a; chemotherapeutic drugs; g-rays; P-glycoprotein; heme oxygenase-1 Solid tumors generally possess hypoxic areas in their central portion because of decreased vascular supply associated with the effects of treatment and the originally increased energy demand of cancer cells, and the hypoxic tissue is one of the serious matters for consideration in the control of malignant tumors. Most tumor cells possess the ability to undergo apoptosis in response to hypoxic conditions. However, tumor cells can adapt to hypoxic conditions by employing a variety of survival tools, which result in the promotion of cancer cell growth and metastasis. [1][2][3] This adaptation of cancer cells to hypoxia is mainly mediated by the transcription factor hypoxia-inducible factor-1 (HIF-1). 4 HIF-1 is a heterodimeric transcription factor consisting of an oxygen-regulated a subunit (HIF1a) and a stable nuclear factor, HIF-1b/aryl hydrocarbon receptor nuclear translocator (ARNT). Under normoxic conditions, HIF-1a is rapidly degraded by the proteosome after being targeted for ubiquitination. HIF-1a translocates to the nucleus under hypoxic conditions and forms an active complex with HIF-1b; the complex binds to the hypoxia-response element (HRE) in the target genes, which results in the transactivation of these genes. 5 Proteins encoded by such genes contribute to the blood supply, energy production, growth/survival, invasion/metastasis and resistance.It has been frequently rep...

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“…3,4 Early premalignant breast cancer lesions, including ductal carcinoma in situ (DCIS), often display increased expression of hypoxic markers, including the oxygen-labile a subunit of hypoxiainducible factor (HIF)-1 and exhibit poor architectural and cellular differentiation. 5 Indeed, HIF-1α expression occurs at low levels in normal breast tissue and ductal hyperplasias but is elevated in the majority of DCIS and invasive lesions.…”

Section: Surviving Without Oxygenmentioning

confidence: 99%

Surviving without oxygen: Hypoxia regulation of mammary morphogenesis and anoikis

Whelan

Reginato²

2011

Cell Cycle

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Hypoxia‐induced pathways in breast cancer

Cited by 63 publications

References 101 publications

BNIP3 plays a role in hypoxic cell death in human epithelial cells that is inhibited by growth factors EGF and IGF

BNIP3 plays a role in hypoxic cell death in human epithelial cells that is inhibited by growth factors EGF and IGF

The involvement of hypoxia‐inducible factor‐1α in the susceptibility to γ‐rays and chemotherapeutic drugs of oral squamous cell carcinoma cells

Surviving without oxygen: Hypoxia regulation of mammary morphogenesis and anoikis

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