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Journal of Histochemistry and Cytochemistry, Vol. 45, 729-736, Copyright © 1997 by The Histochemical Society, Inc.

TECHNICAL NOTE

Sensitive Chemiluminescence In Situ Hybridization for the Detection of Human Papillomavirus Genomes in Biopsy Specimens

Monica Musiania, Marialuisa Zerbinia, Simona Venturolia, Giovanna Gentilomia, Giorgio Gallinellaa, Elisabetta Manaresia, Michelangelo La Placab, Antonietta D'Antuonob, Aldo Rodac, and Patrizia Pasinic
a Institute of Microbiology, University of Bologna, Bologna, Italy
b Institute of Dermatology, University of Bologna, Bologna, Italy
c Department of Pharmaceutical Sciences, University of Bologna, Bologna, Italy

Correspondence to: Monica Musiani, Inst. of Microbiology, Via Massarenti 9, 40138 Bologna, Italy.

We developed a sensitive chemiluminescence in situ hybridization assay for detection of human papillomavirus (HPV) DNA for objective and semiquantitative evaluation of the results. The hybridization reaction was performed using either digoxigenin-, biotin-, or fluorescein-labeled probes, visualized with alkaline phosphatase as the revealing enzyme and a highly sensitive 1,2 dioxetane phosphate as chemiluminescent substrate. The light emitted from the hybridized probes was detected, analyzed, and measured using a high-performance, low light-level imaging luminograph connected to an optical microscope and to a personal computer for quantification of the photon fluxes and for image analysis. The system operated in consecutive steps: First, hybridized specimens were recorded in transmitted light. Then the net luminescent signal was recorded, and then an overlay of the two images provided by the transmitted light and by the luminescent signal allowed the spatial distribution of the target DNA to be localized, measured, and evaluated. Biopsy specimens from different pathological conditions associated with HPV, which had previously been proved positive for HPV DNA with the polymerase chain reaction (PCR), were analysed. The chemiluminescence in situ hybridization proved sensitive and specific with digoxigenin-, biotin-, or fluorescein-labeled probes, and provided an objective evaluation of the results. The results obtained with chemiluminescence in situ hybridization were also compared with results obtained with in situ hybridization with colorimetric detection, with good concordance of the data. Chemiluminescence in situ hybridization therefore offers the possibility of detecting HPV DNA with great sensitivity in biopsy specimens. Moreover, the images of the samples, stored in the computer, are a permanent record of the reaction and can also be sent for evaluation or comparison to other laboratories using computer networks. (J Histochem Cytochem 45:729-735, 1997)

Key Words: chemiluminescence, in situ hybridization, human papillomavirus


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