Abstract
Osteopontin (OPN) is a matricellular protein that binds to a number of cell surface receptors including integrins and CD44. It is expressed in many tissues and secreted into body fluids including blood, milk and urine. OPN plays important physiological roles in bone remodeling, immune response and inflammation. It is also a tumour-associated protein, and elevated OPN levels are associated with tumour formation, progression and metastasis. Research has revealed a promising role for OPN as a cancer biomarker. OPN is subject to alternative splicing, as well as post-translational modifications such as phosphorylation, glycosylation and proteolytic cleavage. Functional differences have been revealed for different isoforms and post-translational modifications. The pattern of isoform expression and post-translational modification is cell-type specific and may influence the potential role of OPN in malignancy and as a cancer biomarker.
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Abbreviations
- ECM:
-
Extracellular matrix
- ELISA:
-
Enzyme-linked immunosorbent assay
- HCC:
-
Hepatocellular carcinoma
- HNSCC:
-
Head and neck squamous cell carcinoma
- MM:
-
Malignant mesothelioma
- MMP:
-
Matrix metalloproteinase
- mRNA:
-
Messenger ribonucleic acid
- NSCLC:
-
Non-small cell lung cancer
- OPN:
-
Osteopontin
- PDA:
-
Pancreatic ductal adenocarcinoma
- Q:
-
Glutamine
- qRT-PCR:
-
Quantitative real time polymerase chain reaction
- RT-PCR:
-
Real time polymerase chain reaction
- RGD:
-
Arginine-Glycine-Aspartic acid
- siRNA:
-
Small interfering ribonucleic acid
- shRNA:
-
Short hairpin ribonucleic acid
- SVVYGLR:
-
Serine-Valine-Valine-Tyrosine-Glycine-Leucine-Arginine
- TG2:
-
Tissue transglutaminase
- uPA:
-
Urokinase plasminogen activator
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Acknowledgements
This work is supported by an award from the Lloyd Carr-Harris Foundation. JCM is supported by a Canadian Graduate Award from the Canadian Institutes of Health Research and a Studentship from the Translational Breast Cancer Research Unit at the London Regional Cancer Program. AFC is a Canada Research Chair in Oncology, supported by the Canada Research Chairs Program.
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Anborgh, P.H., Mutrie, J.C., Tuck, A.B. et al. Pre- and post-translational regulation of osteopontin in cancer. J. Cell Commun. Signal. 5, 111–122 (2011). https://doi.org/10.1007/s12079-011-0130-6
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DOI: https://doi.org/10.1007/s12079-011-0130-6