Endoplasmic reticulum chaperones GRP78 and calreticulin prevent oxidative stress, Ca2+ disturbances, and cell death in renal epithelial cells - PubMed (original) (raw)
. 1997 Aug 29;272(35):21751-9.
doi: 10.1074/jbc.272.35.21751.
Affiliations
- PMID: 9268304
- DOI: 10.1074/jbc.272.35.21751
Free article
Endoplasmic reticulum chaperones GRP78 and calreticulin prevent oxidative stress, Ca2+ disturbances, and cell death in renal epithelial cells
H Liu et al. J Biol Chem. 1997.
Free article
Abstract
Activation of stress response genes can impart cellular tolerance to environmental stress. Iodoacetamide (IDAM) is an alkylating toxicant that up-regulates expression of hsp70 (Liu, H., Lightfoot, D. L., and Stevens, J. L. (1996) J. Biol. Chem. 271, 4805-4812) and grp78 in LLC-PK1 renal epithelial cells. Therefore, we used IDAM to determine the role of these genes in tolerance to toxic chemicals. Prior heat shock did not protect cells from IDAM but pretreatment with trans-4,5-dihydroxy-1,2-dithiane (DTTox), thapsigargin, or tunicamycin enhanced expression of the endoplasmic reticulum (ER) chaperones GRP78 and GRP94 and rendered cells tolerant to IDAM. Cells expressing a 524-base pair antisense grp78 fragment (pkASgrp78) had a diminished capacity to up-regulate grp78 and grp94 expression after ER stress. Protection against IDAM due to prior ER stress was also attenuated in pkASgrp78 cells suggesting that ER chaperones of the GRP family are critical for tolerance. Covalent binding of IDAM to cellular macromolecules and depletion of cellular thiols was similar in tolerant and naïve cells. However, DTTox pretreatment blocked the increases in cellular Ca2+ and lipid peroxidation observed after IDAM treatment. Overexpressing the ER Ca2+-binding protein calreticulin prevented IDAM-induced cell death, the rise in cytosolic Ca2+, and oxidative stress. Although activation of the ER stress response did not prevent toxicity due to Ca2+ influx, EGTA-AM and ruthenium red both blocked cell death suggesting that redistribution of intracellular Ca2+ to the mitochondria may be important in toxicity. The data support a model in which induction of ER stress proteins prevents disturbances of intracellular Ca2+ homeostasis, thus uncoupling toxicant exposure from oxidative stress and cell death. Multiple ER stress proteins are likely to be involved in this tolerance response.
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