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p53 oncogene mutations in three human prostate cancer cell lines
A G Carroll1, H J Voeller, L Sugars
1Division of Medical Oncology, Lombardi Cancer Research Center, Washington, DC 20057.
The Prostate
|January 1, 1993
Summary
Prostate cancer cell lines LNCaP, DU-145, and PC-3 show distinct p53 gene mutations and chromosome 17p alterations. These genetic differences impact p53 protein expression and tumor growth characteristics in vitro and in vivo.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- The p53 tumor suppressor gene is frequently altered in human cancers, including prostate cancer.
- Understanding p53 gene structure and mutations in prostate cancer cell lines is crucial for deciphering tumor development and progression.
Purpose of the Study:
- To investigate the p53 gene structure and chromosome 17p alleles in three human prostate cancer cell lines: LNCaP, DU-145, and PC-3.
- To correlate p53 alterations with P53 protein expression and cellular growth characteristics.
Main Methods:
- Analysis of p53 gene mutations and chromosome 17p allelic status in LNCaP, DU-145, and PC-3 cell lines.
- Immunohistochemical staining for P53 protein expression.
- In vitro and in vivo growth assays comparing LNCaP sub-strains.
Main Results:
- LNCaP cell lines exhibited heterogeneous P53 protein overexpression, with one strain (LNCaP-GW) carrying a specific codon 273 mutation absent in another (LNCaP-ATCC).
- LNCaP-GW showed faster in vitro growth but less efficient tumor formation in vivo compared to LNCaP-ATCC.
- DU-145 cells had two p53 mutations (codons 274 and 223), while PC-3 cells were hemizygous for chromosome 17p with a codon 138 deletion causing a frame shift.
Conclusions:
- Prostate cancer cell lines display diverse p53 gene alterations and chromosome 17p allelic statuses.
- p53 mutations and expression patterns correlate with differential growth and tumorigenic potential.
- In vitro passage may contribute to the emergence of p53 mutations.