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Stabilization of the prostate-specific tumor suppressor NKX3.1 by the oncogenic protein kinase Pim-1 in prostate cancer cells. | LitMetric

AI Article Synopsis

Article Abstract

Loss of NKX3.1 is an early and consistent event in prostate cancer and is associated with increased proliferation of prostate epithelial cells and poor prognosis. NKX3.1 stability is regulated post-translationally through phosphorylation at multiple sites by several protein kinases. Here, we report the paradoxical stabilization of the prostate-specific tumor suppressor NKX3.1 by the oncogenic protein kinase Pim-1 in prostate cancer cells. Pharmacologic Pim-1 inhibition using the small molecule inhibitor CX-6258 decreased steady state levels and half-life of NKX3.1 protein but mRNA was not affected. This effect was reversed by inhibition of the 26S-proteasome, demonstrating that Pim-1 protects NKX3.1 from proteasome-mediated degradation. Mass spectrometric analyses revealed Thr89, Ser185, Ser186, Ser195, and Ser196 as Pim-1 phospho-acceptor sites on NKX3.1. Through mutational analysis, we determined that NKX3.1 phosphorylation at Ser185, Ser186, and within the N-terminal PEST domain is essential for Pim-1-mediated stabilization. Further, we also identified Lys182 as a critical residue for NKX3.1 stabilization by Pim-1. Pim-1-mediated NKX3.1 stabilization may be important in maintaining normal cellular homeostasis in normal prostate epithelial cells, and may maintain basal NKX3.1 protein levels in prostate cancer cells.

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http://dx.doi.org/10.1002/jcb.24444DOI Listing

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