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.
Clin Chim Acta
; 411(23-24): 1935-9, 2010 Dec 14.
Article
em En
| MEDLINE
| ID: mdl-20708609
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 4-10 ng/ml) was affinity purified, separated and probed with the lectin Ulex europaeus (UEA-1; specific for α1,2 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 50 µl of serum with PSA in the range of 4-10 ng/ml, this represents a more specific and sensitive test for PCa based on fucosylation changes of fPSA.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Hiperplasia Prostática
/
Neoplasias da Próstata
/
Análise Química do Sangue
/
Imunoensaio
/
Antígeno Prostático Específico
/
Fucose
Tipo de estudo:
Diagnostic_studies
Limite:
Aged
/
Aged80
/
Humans
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Male
/
Middle aged
Idioma:
En
Revista:
Clin Chim Acta
Ano de publicação:
2010
Tipo de documento:
Article
País de afiliação:
Reino Unido