The Main Molecular Mechanisms Underlying Methamphetamine-Induced Neurotoxicity and Implications for Pharmacological Treatment

Methamphetamine (METH) is a highly addictive psychostimulant that poses severe risks to the central nervous system. Despite its widespread abuse, the precise molecular mechanisms of its neurotoxicity remain complex and partially understood. This review synthesizes current research on how METH damages neural cells, focusing on the interplay between oxidative stress, excitotoxicity, and neuroinflammation.

The paper highlights several key pathways contributing to METH-induced damage:

• Oxidative Stress: METH increases dopamine levels in the brain, leading to auto-oxidation and the production of reactive oxygen and nitrogen species (ROS/RNS). This damages mitochondria and triggers apoptotic cell-death pathways.
• Excitotoxicity: Increased extracellular glutamate levels overactivate glutamate receptors, leading to excessive calcium influx, which promotes cellular stress and death signaling.
• Neuroinflammation: Microglial cells are rapidly activated following METH exposure, releasing pro-inflammatory cytokines that exacerbate neuronal injury.

The authors review various therapeutic candidates that may protect against these mechanisms. Antioxidants like Vitamin C and selenium aim to stabilize redox homeostasis, while mood stabilizers such as lithium and valproate are investigated for their ability to protect mitochondrial integrity. Furthermore, glutamate receptor antagonists and anti-inflammatory agents like minocycline are discussed as potential tools to curb the excitotoxic and inflammatory damage caused by chronic drug use. Emerging therapies, including vaccines that sequester METH in the periphery before it enters the brain, are also noted as promising, though they face challenges regarding efficacy and delivery.