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 i

SUBMITTER: Conway-Campbell BL 

PROVIDER: S-EPMC1948913 | biostudies-literature | 2007 Aug

REPOSITORIES: biostudies-literature