Mangiferin and Morin Attenuate Oxidative Stress, Mitochondrial Dysfunction, and Neurocytotoxicity, Induced by Amyloid...

Area of Science:

• Neuroscience
• Biochemistry
• Pharmacology

Background:

• Amyloid beta (Aβ) oligomers induce oxidative stress and mitochondrial dysfunction, leading to neuronal injury relevant to Alzheimer's disease (AD).
• Polyphenols are explored for neuroprotective properties against brain injury and neurodegenerative conditions.

Purpose of the Study:

• To investigate the neuroprotective effects of morin and mangiferin against Aβ oligomers in neuronal models.
• To elucidate the underlying mechanisms of action for morin and mangiferin's neuroprotection.

Main Methods:

• Utilized cultured cortical neurons and organotypic slices exposed to Aβ oligomers.
• Assessed cell viability, oxidative stress markers, mitochondrial function (calcium load, membrane potential, cytochrome c release), antioxidant enzyme activity, and respiratory capacity.
• Evaluated the impact of morin and mangiferin on these parameters.

Main Results:

• Morin and mangiferin significantly reduced Aβ oligomer-induced neuronal cell death and attenuated oxidative stress.
• Neuroprotection was linked to reduced mitochondrial calcium overload, preserved mitochondrial membrane potential, and inhibited cytochrome c release.
• Both polyphenols enhanced endogenous antioxidant systems, restored oxidized proteins, and mitigated Aβ-induced impairment of respiratory capacity and energy homeostasis.

Conclusions:

• Morin and mangiferin demonstrate significant neuroprotective effects against Aβ oligomer toxicity in neuronal cell models.
• These polyphenols counteract Aβ-induced mitochondrial dysfunction and oxidative stress through multiple mechanisms.
• Morin and mangiferin show therapeutic potential for Alzheimer's disease treatment by preserving neuronal health and mitochondrial function.