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Departments of Pathology [R. J. V., D. C. J. G. v. A., K. G. L. H., J. T.] and Urology [G. J. v. S.], Erasmus University, 3000 DR Rotterdam, the Netherlands
Loss of chromosome 10q is a frequently observed genetic defect in prostate cancer. Recently, the PTEN/MMAC1 tumor suppressor gene was identified and mapped to chromosome 10q23.3. We studied PTEN structure and expression in 4 in vitro cell lines and 11 in vivo xenografts derived from six primary and nine metastatic human prostate cancers. DNA samples were allelotyped for eight polymorphic markers within and surrounding the PTEN gene. Additionally, the nine PTEN exons were tested for deletions. In five samples (PC3, PC133, PCEW, PC295, and PC324), homozygous deletions of the PTEN gene or parts of the gene were detected. PC295 contained a small homozygous deletion encompassing PTEN exon 5. In two DNAs (PC82 and PC346), nonsense mutations were found, and in two (LNCaP and PC374), frame-shift mutations were found. Missense mutations were not detected. PTEN mRNA expression was clearly observed in all cell lines and xenografts without large homozygous deletions, showing that PTEN down-regulation is not an important mechanism of PTEN inactivation. The high frequency (60%) of PTEN mutations and deletions indicates a significant role of this tumor suppressor gene in the pathogenesis of prostate cancer.
1 This work was supported in part by a grant from the Dutch Cancer Society KWF.
2 The first two authors contributed equally to this work.
3 To whom requests for reprints should be addressed, at Department of Pathology, Erasmus University, P.O. Box 1738, 3000 DR Rotterdam, the Netherlands. Phone: 31-10-4087922; Fax: 31-10-4366660; E-mail: trapman@pal.fgg.eur.nl.
Received 3/ 4/98. Accepted 5/15/98.
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