Attenuating Oxidative Damage with Macelignan in Glutamate-Induced HT22 Hippocampal Cells

Macelignan, from Myristica fragrans (nutmeg), is a bioactive compound with various pharmacological properties, including anti-inflammatory and neuroprotective activities. The purpose of this work was to investigate the antioxidant and anti-apoptotic effects of macelignan in glutamate-treated HT22 mouse hippocampal neurons. Macelignan was extracted and identified in a methanol extract of M. fragrans seeds. The DPPH was used to assess the antioxidative activity of macelignan. Glutamate (5 mM) was used to induce neurotoxicity in the HT22 cells. Neuroprotective effects were measured using relevant biochemical and imaging assays, including cell viability, ROS production, nuclear staining, apoptotic cell death, and protein expression. Macelignan markedly and concentration-dependently enhanced DPPH radical scavenging activity. In the HT22 cell model, glutamate induced cell damage by decreasing cell viability, promoting ROS generation, and increasing apoptotic cell death according to cell morphological changes. However, macelignan treatment restored cell viability, inhibited ROS generation concentration-dependently, and reduced apoptosis. Moreover, glutamate significantly up-regulated the phosphorylation of MAPK-pathway-related proteins, which was reversed by macelignan treatment. In conclusion, macelignan shows notable neuroprotective effects on oxidative stress and apoptotic cell death in glutamate-induced cells, and this study provides useful information on its potential therapeutic implications in neurological disorders.