YB-1 is Important for Late-stage Embryonic Development, Optimal Cellular Stress Responses, and the Prevention of Premature Senescence

Overview

Journal Mol Cell Biol

Specialty Cell Biology

Date 2005 May 19

PMID 15899865

Citations 68

Authors

Zhi Hong Lu

Jason T Books

Timothy J Ley

Affiliations

Soon will be listed here.

Abstract

Proteins containing "cold shock" domains belong to the most evolutionarily conserved family of nucleic acid-binding proteins known among bacteria, plants, and animals. One of these proteins, YB-1, is widely expressed throughout development and has been implicated as a cell survival factor that regulates the transcription and/or translation of many cellular growth and death-related genes. For these reasons, YB-1 deficiency has been predicted to be incompatible with cell survival. However, the majority of YB-1(-/-) embryos develop normally up to embryonic day 13.5 (E13.5). After E13.5, YB-1(-/-) embryos exhibit severe growth retardation and progressive mortality, revealing a nonredundant role of YB-1 in late embryonic development. Fibroblasts derived from YB-1(-/-) embryos displayed a normal rate of protein synthesis and minimal alterations in the transcriptome and proteome but demonstrated reduced abilities to respond to oxidative, genotoxic, and oncogene-induced stresses. YB-1(-/-) cells under oxidative stress expressed high levels of the G(1)-specific CDK inhibitors p16Ink4a and p21Cip1 and senesced prematurely; this defect was corrected by knocking down CDK inhibitor levels with specific small interfering RNAs. These data suggest that YB-1 normally represses the transcription of CDK inhibitors, making it an important component of the cellular stress response signaling pathway.

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