Etk/Bmx, a PH-domain containing tyrosine kinase, protects prostate cancer cells from apoptosis induced by photodynamic therapy or thapsigargin

Liang Yan Xue, Yun Qiu, Jin He, Hsing-Jien Kung, Nancy L. Oleinick

Research output: Contribution to journalArticle

72 Scopus citations

Abstract

Prostate carcinoma (PCA) is the most frequently diagnosed malignancy in American men. PCA at advanced stages can both proliferate abnormally and resist apoptosis. Among the many known signal transduction pathways, phosphatidylinositide-3'OH kinase (PI3-kinase) has been shown to play an important role in cell survival and resistance to apoptosis. In this study, we investigate the involvement of Etk/Bmx, a newly discovered tyrosine kinase that is a substrate of PI3-kinase, in protection of prostate cancer cells from apoptosis. Parental LNCaP cells and two derivative cell lines, one overexpressing wild type Etk (Etkwt) and the other expressing a dominant negative Etk (EtkDN), were used to study the function of Etk. The cells were treated with photodynamic therapay (PDT), a newly approved cancer treatment which employs a photosensitizer and visible light to produce an oxidative stress in cells, often leading to apoptosis. Our results indicate that PDT induces apoptosis in LNCaP cells, as measured by DNA fragmentation and by cleavage of poly(ADP-ribose) polymerase (PARP), and moreover, the extent of apoptosis was much reduced in Etkwt cells as compared to LNCaP or EtkDN cells. Assay of overall cell viability confirmed that Etkwt cells were considerably less sensitive to PDT than were the parental LNCaP or EtkDN cells. Similar results were found in response to thapsigargin (TG). A specific inhibitor of PI3-kinase, LY294002, abolished Etk activity and markedly increased TG-induced PARP cleavage. The results suggest that Etk/Bmx is an efficient effector of PI3-kinase and that the newly described PI3-kinase/Etk pathway is involved in the protection of prostate carcinoma cells from apoptosis in response to PDT or TG.

Original languageEnglish (US)
Pages (from-to)3391-3398
Number of pages8
JournalOncogene
Volume18
Issue number22
DOIs
StatePublished - Jun 3 1999
Externally publishedYes

Keywords

  • Apoptosis
  • Etk
  • Photodynamic therapy
  • PI3-kinase
  • Prostate cancer
  • Thapsigargin
  • Tyrosine kinase

ASJC Scopus subject areas

  • Molecular Biology
  • Cancer Research
  • Genetics

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