Adolescent Cannabinoid Exposure Primed Mouse Lungs for Worse Infections Later

Adolescent cannabinoid exposure primed mouse lungs for more severe inflammation when later infected with Klebsiella pneumoniae. This heightened inflammatory response was mitigated by cannabinoid receptor antagonists. Combined alcohol and cannabinoid pre-exposure followed by bacterial challenge produced CB receptor-dependent pulmonary immune activation via danger-associated molecular pattern (DAMP) release.

Mouse model using binge cannabinoid exposure during adolescence followed by Klebsiella pneumoniae lung infection in adulthood. A combined ethanol + cannabinoid adolescent exposure model was also tested. Cannabinoid receptor antagonists were used to confirm mechanism.

Adolescents who binge on cannabis may be setting up their lungs for worse outcomes if they develop pneumonia or other lung infections later in life. The combination with alcohol, common in young adult polydrug use, appears to make the situation worse.

This adds to growing evidence that adolescent substance exposure can have lasting effects on immune function. The finding that cannabinoid receptors mediate the amplified lung immune response suggests potential therapeutic targets for managing respiratory infections in people with substance use histories.

Animal model that may not directly translate to humans. Used synthetic cannabinoid rather than plant-derived THC. Binge exposure model may not reflect typical adolescent cannabis use patterns. Single bacterial pathogen tested.