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Interleukin-8 confers androgen-independent growth and migration of LNCaP: differential effects of tyrosine kinases Src and FAK.

Abstract：

:Interleukin-8 (IL-8), a chemokine implicated in the metastasis and angiogenesis of a variety of cancers, has been reported to be overexpressed in prostate cancer. In this study, we ascribe a new role for IL-8 in prostate cancer progression using LNCaP cells. We demonstrate that IL-8 activates the androgen receptor and confers androgen-independent growth, while serving as a potent chemotactic factor. Our evaluation of the possible signal pathways involved in androgen-independence and cell migration shows that the tyrosine kinases Src and FAK (focal adhesion kinase) are involved in IL-8-induced signaling. Pharmacological and genetic inhibitors of Src and FAK interfere with IL-8-induced cell migration, while only the Src inhibitor was able to repress androgen-independent growth. This suggests that both growth and migration depend on the activity of Src, whereas cell migration also requires the activation of FAK. Our evidence that IL-8-induced androgen-independent growth is, at least in part, due to androgen receptor activation includes (1) an inhibitor of androgen receptor activity diminishes cell growth; (2) androgen receptor transactivation potential is augmented by IL-8 and (3) androgen receptor is recruited to the promoter of prostate specific antigen (PSA) upon IL-8 treatment, based on chromatin immunoprecipitation experiments. Taken together, our data suggest that in addition to its role in metastasis and angiogenesis, IL-8 may also serve as a facilitator for androgen-independent transition of prostate cancers. To our knowledge, this is the first report about the tyrosine kinase signals and androgen receptor activation induced by IL-8 in prostate cancer cells. The observation that IL-8 mediates its growth and chemotactic effects via Src and FAK suggests the potential use for tyrosine kinase inhibitors at early stage of prostate cancer development.

journal_name

Oncogene

journal_title

Oncogene

authors

Lee LF,Louie MC,Desai SJ,Yang J,Chen HW,Evans CP,Kung HJ

doi

10.1038/sj.onc.1207344

subject

Has Abstract

pub_date

2004-03-18 00:00:00

pages

2197-205

issue

12

eissn

0950-9232

issn

1476-5594

pii

1207344

journal_volume

23

pub_type

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