Signals from the stressed endoplasmic reticulum induce C/EBP-homologous protein (CHOP/GADD153). Academic Article uri icon

Overview

abstract

  • The gene encoding C/EBP-homologous protein (CHOP), also known as growth arrest and DNA-damage-inducible gene 153 (GADD153), is activated by agents that adversely affect the function of the endoplasmic reticulum (ER). Because of the pleiotropic effects of such agents on other cellular processes, the role of ER stress in inducing CHOP gene expression has remained unclear. We find that cells with conditional (temperature-sensitive) defects in protein glycosylation (CHO K12 and BHK tsBN7) induce CHOP when cultured at the nonpermissive temperature. In addition, cells that are defective in initiating the ER stress response, because of overexpression of an exogenous ER chaperone, BiP/GRP78, exhibit attenuated inducibility of CHOP. Surprisingly, attenuated induction of CHOP was also noted in BiP-overexpressing cells treated with methyl methanesulfonate, an agent thought to activate CHOP by causing DNA damage. The roles of DNA damage and growth arrest in the induction of CHOP were therefore reexamined. Induction of growth arrest by culture to confluence or treatment with the enzymatic inhibitor N-(phosphonacetyl)-L-aspartate did not induce CHOP. Furthermore, both a DNA-damage-causing nucleoside analog (5-hydroxymethyl-2'-deoxyuridine) and UV light alone did not induce CHOP. These results suggest that CHOP is more responsive to ER stress than to growth arrest or DNA damage and indicate a potential role for CHOP in linking stress in the ER to alterations in gene expression.

publication date

  • August 1, 1996

Research

keywords

  • CCAAT-Enhancer-Binding Proteins
  • DNA-Binding Proteins
  • Endoplasmic Reticulum
  • Heat-Shock Proteins
  • Transcription Factors

Identity

PubMed Central ID

  • PMC231426

Scopus Document Identifier

  • 8944259440

Digital Object Identifier (DOI)

  • 10.1128/MCB.16.8.4273

PubMed ID

  • 8754828

Additional Document Info

volume

  • 16

issue

  • 8