Microglial alterations induced by psychoactive drugs: A possible mechanism in substance use disorder?

Area of Science:

• Neuroimmunology
• Neuropharmacology
• Addiction Science

Background:

• The xenobiotic hypothesis suggests the immune system targets drugs of abuse, causing inflammation.
• Microglial cells, the brain's immune cells, are altered by substance exposure.
• These microglial changes are linked to addiction establishment and persistence.

Purpose of the Study:

• To review recent preclinical and clinical studies on drug-microglia interactions.
• To describe biological mechanisms linking drugs of abuse and microglia.
• To identify potential therapeutic targets for substance use disorder.

Main Methods:

• Review of preclinical rodent studies.
• Analysis of clinical studies.
• Examination of biological communication mechanisms.

Main Results:

• Substances of abuse, including ethanol, psychostimulants, and opioids, interact with microglia.
• These interactions contribute to the neurobiological underpinnings of addiction.
• Microglial activation is a key factor in drug-mediated changes.

Conclusions:

• Microglia are central players in the neurobiology of addiction.
• Understanding drug-microglia communication is crucial for developing novel treatments.
• Targeting microglial pathways offers potential for treating substance use disorder.