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Oxicam-derived Non-steroidal Anti-inflammatory Drugs Suppress 1-methyl-4-phenyl Pyridinium-induced Cell Death Via Repression Of Endoplasmic Reticulum Stress Response And Mitochondrial Dysfunction In SH-SY5Y Cells.

T. Omura, Miwa Sasaoka, Gaia Hashimoto, S. Imai, Joe Yamamoto, Yu-ki Sato, Shunsaku Nakagawa, A. Yonezawa, T. Nakagawa, I. Yano, Yoshikazu Tasaki, K. Matsubara
Published 2018 · Chemistry, Medicine

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We have previously reported that oxicam-derived non-steroidal anti-inflammatory drugs (oxicam-NSAIDs), including meloxicam, piroxicam and tenoxicam, elicit protective effects against 1-methyl-4-phenyl pyridinium (MPP+)-induced cell death in a fashion independent of cyclooxygenase (COX) inhibition. We have also demonstrated that oxicam-NSAIDs suppress the decrease in phosphorylation of Akt caused by MPP+. The molecular mechanism through which oxicam-NSAIDs provide cytoprotection remains unclear. In this study, we speculated a possibility that endoplasmic reticulum (ER) stress and/or mitochondrial dysfunction, which are both causative factors of Parkinson's disease (PD), may be involved in the neuroprotective mechanism of oxicam-NSAIDs. We demonstrated here that oxicam-NSAIDs suppressed the activation of caspase-3 and cell death caused by MPP+ or ER stress-inducer, tunicamycin, in SH-SY5Y cells. Furthermore, oxicam-NSAIDs suppressed the increases in the ER stress marker CHOP (apoptosis mediator) caused by MPP+ or tunicamycin, beside suppressing eukaryotic initiation factor 2α (eIF2α) phosphorylation and the increase in ATF4 caused by MPP+. Taken together, these results suggest that oxicam-NSAIDs suppress the eIF2α-ATF4-CHOP pathway, one of the three signaling pathways in the ER stress response. Oxicam-NSAIDs suppressed the decrease in mitochondrial membrane potential depolarization caused by MPP+, indicating they also rescue cells from mitochondrial dysfunction. Akt phosphorylation levels were suppressed after the incubation with MPP+, whereas phosphorylation of eIF2α was enhanced. These results suggest that oxicam-NSAIDs prevented eIF2α phosphorylation and mitochondrial dysfunction by maintaining Akt phosphorylation (reduced by MPP+), thereby preventing cell death.
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