Int. J. Mol. Sci. 2013, 14(4), 7923-7931; doi:10.3390/ijms14047923
Article

Identification of O-glycosylated Proteins That Are Aberrantly Excreted in the Urine of Patients with Early Stage Ovarian Cancer

1 Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia 2 Department of Obstetrics and Gynaecology, Faculty of Medicine, University of Malaya, Kuala Lumpur 50603, Malaysia 3 Department of Molecular Medicine, Faculty of Medicine, University of Malaya, Kuala Lumpur 50603, Malaysia 4 University of Malaya Centre for Proteomics Research, Faculty of Medicine, University of Malaya, Kuala Lumpur 50603, Malaysia
* Author to whom correspondence should be addressed.
Received: 17 February 2013; in revised form: 4 March 2013 / Accepted: 7 March 2013 / Published: 11 April 2013
(This article belongs to the Section Molecular Diagnostics)
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Abstract: Cancer is known to induce or alter the O-glycosylation of selective proteins that may eventually be excreted in the patients’ urine. The present study was performed to identify O-glycosylated proteins that are aberrantly excreted in the urine of patients with early stage ovarian cancer (OCa). These urinary glycoproteins are potential biomarkers for early detection of OCa. In this study, urinary proteins of patients with early stage OCa and age-matched OCa negative women were subjected to two-dimensional gel electrophoresis and detection using a lectin that binds to the O-glycosylated proteins. Our analysis demonstrated significant enhanced expression of clusterin and leucine-rich alpha-2-glycoprotein, but lower levels of kininogen in the urine of the OCa patients compared to the controls. The different altered levels of these urinary glycoproteins were further confirmed using competitive ELISA. Our data are suggestive of the potential use of the aberrantly excreted urinary O-glycosylated proteins as biomarkers for the early detection of OCa, although this requires further validation in a large clinically representative population.
Keywords: ovarian cancer; urine; biomarker; O-glycan; champedak galactose binding lectin; two-dimensional gel electrophoresis; proteomics

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MDPI and ACS Style

Mu, A.K.-W.; Lim, B.-K.; Hashim, O.H.; Shuib, A.S. Identification of O-glycosylated Proteins That Are Aberrantly Excreted in the Urine of Patients with Early Stage Ovarian Cancer. Int. J. Mol. Sci. 2013, 14, 7923-7931.

AMA Style

Mu AK-W, Lim B-K, Hashim OH, Shuib AS. Identification of O-glycosylated Proteins That Are Aberrantly Excreted in the Urine of Patients with Early Stage Ovarian Cancer. International Journal of Molecular Sciences. 2013; 14(4):7923-7931.

Chicago/Turabian Style

Mu, Alan K.-W.; Lim, Boon-Kiong; Hashim, Onn H.; Shuib, Adawiyah S. 2013. "Identification of O-glycosylated Proteins That Are Aberrantly Excreted in the Urine of Patients with Early Stage Ovarian Cancer." Int. J. Mol. Sci. 14, no. 4: 7923-7931.

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