Abstract
Breast cancer is the most common malignancy and second leading cause of cancer death in women. Ninety percent of mortality in breast cancer is often associated with metastatic progression or relapse in patients. Critical stages in the development of aggressive breast cancer include the growth of primary tumors and their ability to spread to foreign organs and form metastases, as well as the establishment of an independent blood supply within the new tumors. Hence, it is imperative to characterize the key molecules that regulate the metastasis of human breast cancer cells. The expression of CXCR4/CXCL12 in breast tumors has been correlated with a poor prognosis, increased metastasis, resistance to conventional therapeutic agents and a poor outcome in the pathogenesis of breast cancer. However, effective anti-CXCR4 therapy remains a challenge. Here, we will review the putative involvement of the CXCR4/CXCL12 signaling axis in breast cancer metastasis to the brain. Characterization of signaling events important for breast cancer cell growth and their metastasis to the brain should provide insights into breast cancer therapies and improved, successful treatments for breast cancer.
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Abbreviations
- Akt:
-
Protein kinase B
- BBB:
-
Blood brain barrier
- Ca2+ :
-
Calcium ion
- CHK:
-
Csk homologous kinase
- CNS:
-
Central nervous system
- Cox2:
-
Cyclooxygenase-2 (PTGS2)
- CXCL12:
-
Chemokine (C-X-C motif) ligand 12
- CXCR4:
-
CXC chemokine receptor 4
- EAE:
-
Experimental autoimmune encephalomyelitis
- EGFR:
-
Epidermal growth factor receptor
- ErbB2:
-
Epidermal growth factor receptor 2
- ERK1/2:
-
Extracellular signal-regulated kinases 1 and 2
- FAK:
-
Focal adhesion kinase
- FKHRL1:
-
Forkhead transcription factor like 1
- HBMEC:
-
Human brain microvascular endothelial cells
- HER2/Neu:
-
Epidermal growth factor receptor 2
- IL:
-
Interleukins
- KDR/Flt-1:
-
Kinase insert domain receptor
- MAPK:
-
Mitogen-activated protein (MAP) kinases
- MMP:
-
Matrix metalloproteinases
- NF-κB:
-
Nuclear factor-kappa B
- NGF:
-
Nerve growth factor
- NP-1:
-
Neuropilin-1
- PI-3K:
-
Phosphoinositide 3-kinase
- PLC:
-
Phosphoinositide phospholipase C
- RNAi:
-
RNA interference
- SDF-1:
-
Stromal cell-derived factor-1
- TGF-β:
-
Transforming growth factor beta
- VEGF:
-
Vascular endothelial growth factor
- VEGFR1:
-
Vascular endothelial growth factor receptor 1
- YY1B:
-
Yin Yang 1b transcription factor
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Acknowledgements
Limitations of space preclude extensive citation of the literature; we apologize to those whose work is not mentioned herein. Research in this lab is supported, in part, by National Institutes of Health Grants HL80699 (SA), CA096805 (HA), HL00791708 (CVH), Army Breast Cancer Concept Award (SA), the Susan G. Komen Fellowship (SA).
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Hinton, C.V., Avraham, S. & Avraham, H.K. Role of the CXCR4/CXCL12 signaling axis in breast cancer metastasis to the brain. Clin Exp Metastasis 27, 97–105 (2010). https://doi.org/10.1007/s10585-008-9210-2
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DOI: https://doi.org/10.1007/s10585-008-9210-2