Time-resolved fluorescence imaging (TRFI) for direct immunofluorescence of PSA and alpha-1-antichymotrypsin in prostatic tissue sections

1 May 1999

journal article
Published by Springer Nature in Prostate Cancer and Prostatic Diseases

Vol. 2 (3) , 140-147
https://doi.org/10.1038/sj.pcan.4500307

Abstract

We have developed a direct immunofluorescence technique utilising chelates of the lanthanide ions europium and terbium conjugated to monoclonal IgGs (Mabs) against prostate-specific antigen (PSA) and alpha-1-antichymotrypsin (ACT) for the detection and quantification on the same tissue section. Strong signals without disturbance from tissue autofluorescence were demonstrated in paraffin sections of ten benign and six malignant prostate tissue specimens. The signal intensity increased linearly with the amount of labelled Mab until epitope saturation began. The highest concentrations of bound IgG in tissue sections were 27.3 fmol/pixel for ACT and 7.2 for PSA. Time-resolved fluorescence imaging (TRFI) offers an attractive method for histochemical studies based on specific and quantitative detection of fluorescent lanthanide chelates.

Keywords

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