A novel isoform ratio switch of the polypyrimidine tract binding protein

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

In this report we present evidence for a novel switch in the ratio of the two major isoforms of the polypyrimidine tract binding protein (PTB) in two related prostate cancer cell lines. The existence of different isoforms of PTB is thought to be the result of alternative splicing. We used UV cross- linking to identify a PTB doublet in the DT3 cell line, which is a rat prostate epithelial cancer line that is androgen-dependent and nonmetastatic. The AT3 cell line, a metastatic, androgen-independent cell line derived from the same tumor as the DT3 cells, was noted here to have a different isoform ratio of PTB. The two most prevalent isoforms of PTB were found to bind to an RNA probe containing a pyrimidine stretch. Western blot analysis demonstrated that these isoforms are indeed expressed differently in the two cell lines and that the observed binding is the result of this differential expression. These two cell lines are derived from the original Dunning prostate tumor, which is a model for studying tumor progression in the prostate. This ratio switch may be an important event in tumor progression in this model system of prostate cancer.

Original languageEnglish (US)
Pages (from-to)1082-1086
Number of pages5
JournalElectrophoresis
Volume20
Issue number4-5
DOIs
StatePublished - 1999
Externally publishedYes

Fingerprint

Polypyrimidine Tract-Binding Protein
Protein Isoforms
Cells
Switches
Cell Line
Tumors
Prostatic Neoplasms
Androgens
Prostate
Neoplasms
RNA Probes
Alternative Splicing
Crosslinking
Rats
Western Blotting

Keywords

  • Alternative splicing
  • Isoforms
  • Polypyrimidine tract binding protein
  • Prostate cancer

ASJC Scopus subject areas

  • Clinical Biochemistry

Cite this

A novel isoform ratio switch of the polypyrimidine tract binding protein. / Wagner, Eric; Carstens, Russ P.; Garcia-Blanco, Mariano.

In: Electrophoresis, Vol. 20, No. 4-5, 1999, p. 1082-1086.

Research output: Contribution to journalArticle

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