Multivalent Neuroprotective Activity of <i>Elettaria cardamomum</i> (Cardamom) and <i>Foeniculum vulgare</i> (Fennel) in H₂O₂-Induced Oxidative Stress in SH-SY5Y Cells and Acellular Assays

초록

Background: Elettaria cardamomum (Cardamom) and Foeniculum vulgare (Fennel) are well-known spices and are also used as natural mouth fresheners. This study was performed to evaluate their neuroprotective ability based on certain acellular and cellular assays. Methods: Hexane and ethyl acetate extracts were prepared using cardamom and fennel seeds. GC/MS was performed for the identification of important bioactive compounds. Cell-based assays were performed using SH-SY5Y cells. Hydrogen peroxide was used for the induction of oxidative stress, and evaluation was done based on neuroprotection, reduced reactive oxygen species, and restoration of mitochondrial membrane potential (MMP). Additionally, anti-A beta fibrillization/oligomerization activities were also analyzed along with anti-acetylcholinesterase activity. Results: alpha-Terpinyl acetate and anethol were identified as major phytocompounds in cardamom and fennel, respectively. Cardamom extracts and alpha-terpinyl acetate were more potent acetylcholinesterase (AChE) inhibitors than fennel extracts and anethol [IC50 cardamom extracts, 130-150 mu g/mL; alpha-terpinyl acetate, 61.87 mu g/mL; anethol, 374.2 mu g/mL; fennel extracts, >1 mg/mL] and showed mixed-type inhibition. Only the extracts displayed potent anti-A beta fibrilization activity (>50%). Anethol showed potent anti-A beta oligomerization activity (>50%), followed by alpha-terpinyl acetate and fennel-H (similar to 36%). The neuroprotective potential of the spice extracts/phytochemicals was evaluated in SH-SY5Y cells by using H2O2-induced oxidative stress. Cardamom-EA displayed the best neuroprotection (0.01 to 30 mu g/mL). No neuroprotection was observed by alpha-terpinyl acetate and anethol. Cardamom extracts and fennel-H restored the normal reactive oxygen species (ROS) levels at 30 mu g/mL and 1 mu g/mL, respectively. Conclusion: Overall, the extracts provided better neuroprotection than the pure compounds in cellular assays and displayed strong anti-A beta fibrilization activity.

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