Melatonin, a calpain inhibitor in the central nervous system: Current status and future perspectives

Area of Science:

• Neuroscience
• Biochemistry
• Pharmacology

Background:

• Neuronal calcium (Ca2+) dysregulation and oxidative stress activate cysteine proteases like calpains and caspases, leading to neuronal death.
• Elevated calpain activity is observed in neurodegenerative diseases, traumatic brain injury, stroke, and neuropathic pain.
• Melatonin is recognized for its antioxidant properties and benefits in central nervous system (CNS) disorders, modulating pathways like oxidative stress and apoptosis.

Purpose of the Study:

• To review the current understanding of melatonin's effects on calpains.
• To highlight the potential of melatonin as an inhibitor of calpains in CNS disorders.

Main Methods:

• Literature review of studies investigating melatonin and calpains.
• Analysis of molecular pathways regulated by melatonin, including antioxidant and anti-apoptotic effects.

Main Results:

• Calpain activity is implicated in neuronal damage across various CNS conditions.
• Melatonin exhibits potent antioxidant and free-radical scavenging activities.
• Limited studies currently exist on melatonin's direct inhibitory effects on calpains.

Conclusions:

• Melatonin's known properties suggest a potential role in mitigating calpain-mediated neuronal death.
• Further investigation into melatonin's calpain inhibitory effects is warranted for CNS disorder treatment.