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A sensitive assay to measure biomarker glycosylation demonstrates increased fucosylation of prostate specific antigen (PSA) in patients with prostate cancer compared with benign prostatic hyperplasia

Dwek, Miriam and Jenks, Andrew and Leathem, Anthony (2010) A sensitive assay to measure biomarker glycosylation demonstrates increased fucosylation of prostate specific antigen (PSA) in patients with prostate cancer compared with benign prostatic hyperplasia. Clinica Chimica Acta, 411 (23-24). pp. 1935-1939. ISSN 0009-8981

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Official URL: http://dx.doi.org/10.1016/j.cca.2010.08.009

Abstract

BACKGROUND: Prostate specific antigen (PSA) measurement is used for the diagnosis of prostate cancer (PCa) but the test lacks specificity due to the number of false positive readings. The glycosylation of PSA is altered in PCa but studies in this area have been limited to few clinical samples and/or require advanced laboratory facilities. An assay to assess PSA glycosylation was established using equipment available in most routine biomedical testing laboratories. METHODS: Serum samples from patients with PCa or benign prostatic hyperplasia (BPH) were used. PSA (range 4-10ng/ml) was affinity purified, separated and probed with the lectin Ulex europaeus (UEA-1; specific for alpha1,2 linked fucose). An enzyme-linked immunosorbent lectin assay (ELLA) with colorimetric detection was devised and PSA fucosylation assessed in a further independent set of 26 samples. RESULTS: Free PSA (fPSA) from PCa patients showed a significant increase in fucosylation compared with fPSA from patients with BPH. The ELLA was 92% specific and 69% sensitive for PCa over BPH. In comparison, fPSA measurement was 70% specific and 56% sensitive (threshold set to 25% tPSA) for PCa over BPH. CONCLUSIONS: Changes in glycosylation of PSA were identified using 50mul of serum with PSA in the range of 4-10ng/ml, this represents a more specific and sensitive test for PCa based on fucosylation changes of fPSA.

Item Type:Article
Research Community:University of Westminster > Life Sciences, School of
ID Code:8526
Deposited On:27 Aug 2010 12:28
Last Modified:21 Jan 2011 12:11

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