Melatonin attenuates brain mitochondria DNA damage induced by potassium cyanide in vivo and in vitro

Area of Science:

• Neuroscience
• Biochemistry
• Toxicology

Background:

• Mitochondrial DNA (mtDNA) is vulnerable to oxidative damage.
• Potassium cyanide is a known toxin that can affect cellular respiration.
• Reactive oxygen species (ROS) are implicated in various pathological processes.

Purpose of the Study:

• To investigate the in vivo and in vitro effects of potassium cyanide on mouse brain mitochondrial DNA (mtDNA).
• To determine the role of reactive oxygen species (ROS) in cyanide-induced mtDNA damage.
• To evaluate the protective potential of melatonin against cyanide-induced neurotoxicity and mtDNA damage.

Main Methods:

• In vitro incubation of mouse brain mitochondria with potassium cyanide and melatonin.
• In vivo subcutaneous injection of potassium cyanide and melatonin in mice.
• Assessment of mtDNA damage and lipid peroxidation.
• Evaluation of seizure activity in mice.

Main Results:

• Potassium cyanide caused concentration-dependent mtDNA damage and increased lipid peroxidation in vitro.
• Potassium cyanide injection induced brain mtDNA damage and seizures in vivo.
• Melatonin treatment prevented cyanide-induced mtDNA damage, lipid peroxidation, and seizures.
• Hydrogen peroxide also induced mtDNA damage, which was mitigated by melatonin.

Conclusions:

• Reactive oxygen species, particularly hydroxyl radicals, play a key role in potassium cyanide-induced mtDNA damage.
• Melatonin exhibits significant neuroprotective effects against cyanide toxicity by scavenging ROS.
• Melatonin is a potential therapeutic agent for mitigating oxidative stress-induced DNA damage.