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Nuclear targeting of the growth hormone receptor results in dysregulation of cell proliferation and tumorigenesis.

Abstract：

:Growth hormone receptor (GHR) has been demonstrated to be nuclear localized both in vivo and in vitro, but the significance of this observation has remained elusive. Here we show that nuclear GHR is strongly correlated with proliferative status in vivo by using a liver regeneration model. In vitro, nuclear translocation of the GH receptor is GH-dependent and appears to be mediated by the Importin system. Constitutive nuclear targeting of GHR in murine pro-B cells is associated with constitutive activation of STAT5, a transforming agent in lymphoma and other cell types. This activation is abrogated by inhibition of JAK2 and appears to be driven by autocrine murine GH action coupled with enhanced nuclear uptake of phospho-STAT5. Nuclear targeting induces dysregulated cell cycle progression in the pro-B cell line, associated with constitutive up-regulation of the proliferation inducers Survivin and Mybbp, the metastasis related Dysadherin, and other tumor markers. GHR nuclear-targeted cells generate aggressive metastatic tumors when injected into nude mice, which display nuclear localized GHR strikingly similar to that seen in human lymphomas. We conclude that aberrant nuclear localization of GHR is a marker of high proliferative status and is sufficient to induce tumorigenesis and tumor progression.

journal_name

Proc Natl Acad Sci U S A

journal_title

Proceedings of the National Academy of Sciences of the United States of America

authors

Conway-Campbell BL,Wooh JW,Brooks AJ,Gordon D,Brown RJ,Lichanska AM,Chin HS,Barton CL,Boyle GM,Parsons PG,Jans DA,Waters MJ

doi

10.1073/pnas.0600181104

subject

Has Abstract

pub_date

2007-08-14 00:00:00

pages

13331-6

issue

33

eissn

0027-8424

issn

1091-6490

pii

0600181104

journal_volume

104

pub_type

杂志文章

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