T-cell intracellular antigens function as tumor suppressor genes

Cell Death & Disease
Carmen Sánchez-JiménezJosé M Izquierdo

Abstract

Knockdown of T-cell intracellular antigens TIA1 and TIAR in transformed cells triggers cell proliferation and tumor growth. Using a tetracycline-inducible system, we report here that an increased expression of TIA1 or TIAR in 293 cells results in reduced rates of cell proliferation. Ectopic expression of these proteins abolish endogenous TIA1 and TIAR levels via the regulation of splicing of their pre-mRNAs, and partially represses global translation in a phospho-eukaryotic initiation factor 2 alpha-dependent manner. This is accompanied by cell cycle arrest at G1/S and cell death through caspase-dependent apoptosis and autophagy. Genome-wide profiling illustrates a selective upregulation of p53 signaling pathway-related genes. Nude mice injected with doxycycline-inducible cells expressing TIA1 or TIAR retard, or even inhibit, growth of xenotumors. Remarkably, low expressions of TIA1 and TIAR correlate with poor prognosis in patients with lung squamous cell carcinoma. These findings strongly support the concept that TIA proteins act as tumor suppressor genes.

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Citations

Jun 4, 2015·Cell Cycle·Carmen Sánchez-Jiménez, José M Izquierdo
Jul 14, 2017·Aging Cell·Mathieu Deschênes, Benoit Chabot
Oct 24, 2018·Molecular and Cellular Biology·Isabel CarrascosoJosé M Izquierdo
Nov 28, 2018·Wiley Interdisciplinary Reviews. RNA·Kiyoshi Masuda, Yuki Kuwano
Sep 30, 2018·Bioscience Reports·Qingqing YinShaoqing Ju
Feb 23, 2019·World Journal of Gastrointestinal Oncology·Noémie LegrandCyril Sobolewski
Sep 5, 2019·Cancer Research·Emmeline L BlanchardPhilip J Santangelo
Jun 8, 2021·Frontiers in Cell and Developmental Biology·Danae Campos-MeloMichael J Strong

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Datasets Mentioned

BETA
GSE51500

Methods Mentioned

BETA
confocal microscopy
flow cytometry
PCR
immunoprecipitation
iCLIP
FACS
xenografts
environmental stress
biopsies

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