HepG2/C3A cells respond to cysteine deprivation by induction of the amino acid deprivation/integrated stress response pathway.

Abstract:

:To further define genes that are differentially expressed during cysteine deprivation and to evaluate the roles of amino acid deprivation vs. oxidative stress in the response to cysteine deprivation, we assessed gene expression in human hepatoma cells cultured in complete or cysteine-deficient medium. Overall, C3A cells responded to cysteine deprivation by activation of the eukaryotic initiation factor (eIF)2alpha kinase-mediated integrated stress response to inhibit global protein synthesis; increased expression of genes containing amino acid response elements (ASNS, ATF3, CEBPB, SLC7A11, and TRIB3); increased expression of genes for amino acid transporters (SLC7A11, SLC1A4, and SLC3A2), aminoacyl-tRNA synthetases (CARS), and, to a limited extent, amino acid metabolism (ASNS and CTH); increased expression of genes that act to suppress growth (STC2, FOXO3A, GADD45A, LNK, and INHBE); and increased expression of several enzymes that favor glutathione synthesis and maintenance of protein thiol groups (GCLC, GCLM, SLC7A11, and TXNRD1). Although GCLC, GCLM, SLC7A11, HMOX, and TXNRD1 were upregulated, most genes known to be upregulated via oxidative stress were not affected by cysteine deprivation. Because most genes known to be upregulated in response to eIF2alpha phosphorylation and activating transcription factor 4 (ATF4) synthesis were differentially expressed in response to cysteine deprivation, it is likely that many responses to cysteine deprivation are mediated, at least in part, by the general control nondepressible 2 (GCN2)/ATF4-dependent integrated stress response. This conclusion was supported by the observation of similar differential expression of a subset of genes in response to leucine deprivation. A consequence of sulfur amino acid restriction appears to be the upregulation of the cellular capacity to cope with oxidative and chemical stresses via the integrated stress response.

journal_name

Physiol Genomics

journal_title

Physiological genomics

authors

Lee JI,Dominy JE Jr,Sikalidis AK,Hirschberger LL,Wang W,Stipanuk MH

doi

10.1152/physiolgenomics.00263.2007

subject

Has Abstract

pub_date

2008-04-22 00:00:00

pages

218-29

issue

2

eissn

1094-8341

issn

1531-2267

pii

00263.2007

journal_volume

33

pub_type

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