Grp78 is essential for 11-deoxy-16,16-dimethyl PGE2-mediated cytoprotection in renal epithelial cells

American Journal of Physiology. Renal Physiology
Zhe JiaSerrine S Lau

Abstract

11-Deoxy-16,16-dimethyl PGE(2) (DDM-PGE(2)) protects renal proximal tubule epithelial cells (LLC-PK(1)) against the toxicity induced by 2,3,5-tris(glutathion-S-yl)hydroquinone (TGHQ), a potent nephrotoxic and nephrocarcinogenic metabolite of hydroquinone. We have now determined the ability of DDM-PGE(2) to protect against other renal toxicants and report that DDM-PGE(2) only protects against oncotic cell death, induced by H(2)O(2), iodoacetamide, and TGHQ, but not against apoptotic cell death induced by cisplatin, mercuric chloride, or tumor necrosis factor-alpha. DDM-PGE(2)-mediated cytoprotection is associated with the upregulation of at least five proteins, including the major endoplasmic reticulum (ER) chaperone glucose-regulated protein 78 (Grp78). To elucidate the role of Grp78 in oncotic cell death, we used LLC-PK(1) cells in which induction of grp78 expression was disrupted by stable expression of an antisense grp78 RNA (pkASgrp78). As anticipated, DDM-PGE(2) failed to induce Grp78 in pkASgrp78 cells, with a concomitant inability to provide cytoprotection. In contrast, DDM-PGE(2) induced Grp78 and afforded cytoprotection against H(2)O(2), iodoacetamide, and TGHQ in empty vector transfected cells (pkNEO). These data sugg...Continue Reading

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