Skip Navigation
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Your Environment. Your Health.

Publication Detail

Title: Inhibition of PHLPP2/cyclin D1 protein translation contributes to the tumor suppressive effect of NFκB2 (p100).

Authors: Xu, Jiawei; Wang, Yulei; Hua, Xiaohui; Xu, Jiheng; Tian, Zhongxian; Jin, Honglei; Li, Jingxia; Wu, Xue-Ru; Huang, Chuanshu

Published In Oncotarget, (2016 Jun 07)

Abstract: Although the precursor protein of NFκB2 (p100) is thought to act as a tumor suppressor in mammalian cells, the molecular mechanism of its anti-tumor activity is far from clear. Here, we are, for the first time, to report that p100 protein expression was dramatically decreased in bladder cancers of N-butyl-N-(4-hydroxybutyl)-nitrosamine (BBN)-treated mice and human patients. Knockdown of p100 in cultured human bladder cancer cells promoted anchorage-independent growth accompanied with elevating abundance of cell-cycle-related proteins and accelerated cell-cycle progression. Above effects could be completely reversed by ectopically expression of p100, but not p52. Mechanistically, p100 inhibited Cyclin D1 protein translation by activating the transcription of LARP7 and its hosted miR-302d, which could directly bind to 3'-UTR of cyclin d1 mRNA and inhibited its protein translation. Furthermore, p100 suppressed the expression of PHLPP2 (PH domain and leucine-rich repeat protein phosphatases 2), thus promoting CREB phosphorylation at Ser133 and subsequently leading to miR-302d transcription. Taken together, our studies not only for the first time establish p100 as a key tumor suppressor of bladder cancer growth, but also identify a novel molecular cascade of PHLPP2/CREB/miR-302d that mediates the tumor suppressive function of p100.

PubMed ID: 27095572 Exiting the NIEHS site

MeSH Terms: Animals; Cyclin D1/metabolism; Gene Expression Regulation, Neoplastic/physiology*; Humans; Mice; NF-kappa B p52 Subunit/metabolism*; Phosphoprotein Phosphatases/metabolism; Protein Biosynthesis; Tumor Suppressor Proteins/metabolism*; Urinary Bladder Neoplasms/metabolism; Urinary Bladder Neoplasms/pathology*

Back
to Top