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Nordihydroguaiaretic acid induces astroglial death via glutathione depletion
Author(s) -
Im JooYoung,
Han PyungLim
Publication year - 2007
Publication title -
journal of neuroscience research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.72
H-Index - 160
eISSN - 1097-4547
pISSN - 0360-4012
DOI - 10.1002/jnr.21431
Subject(s) - nordihydroguaiaretic acid , glutathione , programmed cell death , lipoxygenase , chemistry , reactive oxygen species , mitochondrion , inner mitochondrial membrane , mitochondrial permeability transition pore , biochemistry , pharmacology , microbiology and biotechnology , biology , apoptosis , enzyme
Nordihydroguaiaretic acid (NDGA) is known to cause cell death in certain cell types that is independent of its activity as a lipoxygenase inhibitor; however, the underlying mechanisms are not fully understood. In the present study, we examined the cellular responses of cultured primary astroglia to NDGA treatment. Continuous treatment of primary astroglia with 30 μM NDGA caused >85% cell death within 24 hr. Cotreatment with the lipoxygenase products 5‐HETE, 12‐HETE, and 15‐HETE did not override the cytotoxic effects of NDGA. In assays employing the mitochondrial membrane potential‐sensitive dye JC‐1, NDGA was found to induce a rapid and almost complete loss of mitochondrial membrane potential. However, the mitochondrial permeability transition pore inhibitors cyclosporin A and bongkrekic acid did not block NDGA‐induced astroglial death. We found that treatment with N‐acetyl cysteine (NAC), glutathione (GSH), and GSH ethyl ester (GSH‐EE) did inhibit NDGA‐induced astroglial death. Consistently, NDGA‐induced astroglial death proceeded in parallel with intracellular GSH depletion. Pretreatment with GSH‐EE and NAC did not block NDGA‐induced mitochondrial membrane potential loss, and there was no evidence that reactive oxygen species (ROS) production was involved in NDGA‐induced astroglial death. Together, these results suggest that NDGA‐induced astroglial death occurs via a mechanism that involves GSH depletion independent of lipoxygenase activity inhibition and ROS stress. © 2007 Wiley‐Liss, Inc.