Detection of prostatic specific membrane antigen messenger RNA using immunobead reverse transcriptase polymerase chain reaction

Ronald A. Ghossein, Iman Osman, Satyajit Bhattacharya, Jay Ferrara, Melissa Fazzari, Carlos Cordon-Cardo, Howard I. Scher

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


The present study was performed to detect circulating prostatic carcinoma (PC) cells using a novel three-step immunobead reverse transcriptase (RT) polymerase chain reaction (PCR) assay for prostatic specific membrane antigen (PSMA) messenger RNA (mRNA). The sensitivity and specificity of this technique was assessed and the incidence of immunobead RT-PCR positivity correlated with progressive metastatic disease and serum prostatic specific antigen (PSA) levels. Fifty peripheral blood (PB) samples from 46 patients with PC were incubated with magnetic beads coated with Ber- EP4 antibody directed against the human epithelial antigen, a membrane antigen widely expressed by epithelial cells. The epithelial cell-enriched magnetic fraction was then subjected to mRNA isolation using oligo- deoxythymidine (dT) magnetic beads. Nested RT-PCR for PSMA was performed on the mRNA oligo-dT complex and the identity of the RT-PCR products was confirmed by Southern blotting. Twenty-one PB samples from 8 control subjects without PC were also evaluated. Three-step immunobead PSMA RT-PCR was able to detect one PC cell per 1 mL of PB. The positivity rate of the RT-PCR assay was significantly higher (11 of 25; 44%) in patients with metastatic tumor than in patients with non-metastatic disease (1 of 21; 5%) (P = 0.003). In patients with metastatic PC, RT-PCR positivity was much higher in patients with progressive disease (10 of 13; 77%) than in patients with responding or stable disease (1 of 12; 8%) (P = 0.001). There was a statistically significant correlation between immunobead PSMA PCR positivity and high levels of serum PSA (P = 0.005). All control subjects without PC tested negative for PSMA PCR. The three-step immunobead RT-PCR for PSMA can detect circulating PC cells with high specificity and sensitivity. Preliminary data show a strong correlation between immunobead PCR positivity, the presence of progressive metastatic disease, and high levels of serum PSA.

Original languageEnglish (US)
Pages (from-to)59-65
Number of pages7
JournalDiagnostic Molecular Pathology
Issue number2
StatePublished - Jun 1999
Externally publishedYes


  • Immunobead
  • Prostatic carcinoma
  • Prostatic specific membrane antigen
  • Reverse transcriptase polymerase chain reaction

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Molecular Biology
  • Cell Biology


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