Journal of Cell Communication and Signaling

, Volume 5, Issue 2, pp 111–122

Pre- and post-translational regulation of osteopontin in cancer

Authors

  • Pieter H. Anborgh
    • London Regional Cancer Program
  • Jennifer C. Mutrie
    • London Regional Cancer Program
    • Department of PathologyUniversity of Western Ontario
  • Alan B. Tuck
    • London Regional Cancer Program
    • Department of PathologyUniversity of Western Ontario
    • London Health Sciences Centre
    • Department of OncologyUniversity of Western Ontario
    • London Regional Cancer Program
    • Department of PathologyUniversity of Western Ontario
    • Department of OncologyUniversity of Western Ontario
Review

DOI: 10.1007/s12079-011-0130-6

Cite this article as:
Anborgh, P.H., Mutrie, J.C., Tuck, A.B. et al. J. Cell Commun. Signal. (2011) 5: 111. doi:10.1007/s12079-011-0130-6

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.

Keywords

OsteopontinCancerMetastasisMatricellular proteinPost-translational modificationAlternative splicing

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

Copyright information

© The International CCN Society 2011