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Laser-capture Microdissection of Human Prostatic Epithelium for RNA Analysis
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Laser-capture Microdissection of Human Prostatic Epithelium for RNA Analysis

Published on: November 26, 2015

Identification of nucleolar protein No55 as a tumour-associated autoantigen in patients with prostate cancer

A Fosså1, R Siebert, H C Aasheim

  • 1Department of Immunology, The Norwegian Radium Hospital, Montebello, Oslo, 0310, Norway.

British Journal of Cancer
|August 23, 2000
PubMed

Insights

Researchers identified the nucleolar protein No55 in prostate cancer. Its expression was elevated in tumors and metastatic lesions, and antibodies were found in patient sera, suggesting No55 as a potential prostate cancer antigen.

Area of Science:

  • Oncology
  • Immunology
  • Molecular Biology

Background:

  • Prostate cancer diagnosis and treatment can be improved by identifying novel biomarkers.
  • Understanding tumor-specific antigens is crucial for developing immunotherapies.

Purpose of the Study:

  • To identify novel genes expressed in prostate cancer.
  • To investigate the role of the nucleolar protein No55 in prostate cancer.
  • To evaluate No55 as a potential target for prostate cancer immunotherapy.

Main Methods:

  • Immunoscreening of a cDNA expression library from DU145 prostate cancer cells.
  • Reverse transcriptase/polymerase chain reaction (RT-PCR) for gene expression analysis.
  • Serological analysis to detect anti-No55 antibodies in patient and control sera.
  • Sequence analysis of the No55 gene.
  • Chromosomal localization of the No55 gene.

Main Results:

  • Four genes were identified, including the nucleolar protein No55.
  • No55 mRNA was expressed in normal tissues and prostate cancer cell lines.
  • No55 expression was significantly higher in primary prostate tumors and metastatic lesions compared to normal prostate tissue.
  • Antibodies to No55 were detected in sera of prostate cancer patients but not in healthy controls.
  • No tumor-specific mutations were found in the No55 gene.
  • The No55 gene is located on chromosome 17q21, a region frequently deleted in prostate cancer.

Conclusions:

  • The nucleolar protein No55 is immunogenic in prostate cancer patients.
  • Elevated No55 expression in tumors suggests its potential as a biomarker.
  • No55's expression profile and chromosomal localization warrant further investigation as a potential antigen for prostate cancer immunotherapy.

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