Immunofluorometric assay of pepsinogen C and preliminary clinical applications

E. P. Diamandis, S. Nadkarni, B. Bhaumik, A. Abdelrahman, D. N. Melegos, G. Borchert, M. H. Black, M. Alonso, A. Salas, J. R. De los Toyos, A. Sampedro, C. Lopez-Otin

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Abstract

We developed mouse monoclonal antibodies (Abs) against pepsinogen C with highly purified antigen isolated from gastric mucosa. The Abs were used to construct a two-site sandwich-type assay for pepsinogen C with time-resolved fluorometry as a detection technique. The assay has a detection limit of 0.1 μg/L and is precise (within-run and day-to-day CVs <11%). We used this assay to measure pepsinogen C in seminal plasma, breast cyst fluid, amniotic fluid, male and female serum, serum from patients with prostate cancer, urine, breast tumor cytosolic extracts, breast milk, and cerebrospinal fluid. Highest pepsinogen C concentrations were in seminal plasma, followed by breast cyst fluid and amniotic fluid. We found no correlation between prostate-specific antigen concentrations and concentrations of pepsinogen C in serum of prostate cancer patients, and concluded that this marker is not useful for either diagnosing or monitoring prostatic carcinoma. The availability of a highly sensitive, reliable, and convenient method for quantifying pepsinogen C will allow investigations into the possible diagnostic value of this analyte in various clinical conditions, including benign breast diseases, breast cancer, fertility and pregnancy.

Original languageEnglish
Pages (from-to)1365-1371
Number of pages7
JournalClinical Chemistry
Volume43
Issue number8
Publication statusPublished - 1997

Keywords

  • Amniotic fluid
  • Androgen- regulated genes
  • Breast cancer
  • Prognostic markers
  • Proteases

ASJC Scopus subject areas

  • Clinical Biochemistry

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    Diamandis, E. P., Nadkarni, S., Bhaumik, B., Abdelrahman, A., Melegos, D. N., Borchert, G., Black, M. H., Alonso, M., Salas, A., De los Toyos, J. R., Sampedro, A., & Lopez-Otin, C. (1997). Immunofluorometric assay of pepsinogen C and preliminary clinical applications. Clinical Chemistry, 43(8), 1365-1371.