Three weeks of low-dose THC improved wound closure in old mice by reorganizing immune cell timing and reducing inflammation.
Aging researchers, wound care specialists, scientists studying the endocannabinoid system in aging.
3 mg/kg daily THC improved wound healing
What the researchers found
Old female mice receiving daily low-dose THC (3 mg/kg) for three weeks before skin wounding showed improved wound healing rates between days 1 and 7. THC treatment altered the timing and quantity of immune cell infiltration, decreased inflammatory cytokines on days 1 and 3, and significantly increased mesenchymal stem cell infiltration in wound tissue.
Why it matters
Aging impairs wound healing through disrupted immune responses and delayed tissue repair. This study suggests that low-dose THC could restore proper immune cell coordination in aging tissue, offering a potential therapeutic approach for age-related wound healing problems.
The numbers in context
THC dose: 3 mg/kg daily for 21 days. Improved healing observed days 1-7 post-injury. Decreased inflammatory cytokines on days 1 and 3. Increased mesenchymal stem cell infiltration. No effect on growth factor release.
How the study worked
Old female mice received daily low-dose medical THC (3 mg/kg) for 3 weeks, then four full-thickness skin wounds were created. Wound closure was analyzed at days 1, 3, and 7. Wound tissue was examined immunohistochemically for granulocytes, M1-macrophages, and mesenchymal stem cells. Inflammatory cytokines and growth factors were measured by ELISA.
What this study cannot tell us
Animal study in mice; results may not translate to humans. Only female mice were studied. Single THC dose level tested. Short wound observation period (7 days). Did not examine long-term healing outcomes or scar quality.
How to read the evidence
Preliminary: animal study with clear biological mechanism but not yet tested in humans.
When this study was published
2025 study
The bigger picture
The endocannabinoid system declines with age, and this study suggests that restoring ECS signaling with low-dose THC could help coordinate the immune response needed for efficient wound repair. This aligns with broader research showing low-dose THC may have different and potentially beneficial effects in aged organisms compared to young ones.
Questions still open
- Would similar results occur in male mice or at different doses? Could topical THC application achieve the same wound healing benefits? What is the mechanism by which THC coordinates immune cell timing in aged tissue?
Common questions
How did THC help wounds heal faster in old mice?
Could this work in humans?
Read the original research
A chronic low dose of Δ9-tetrahydrocannabinol (3 mg / kg / 21 d) reorganizes the disturbed wound healing process and accelerates wound closure in old female mice.
Experimental gerontology, 208, 112832
Citation
Plum, Melissa; Beier, Justus P; Ruhl, Tim. (2025). A chronic low dose of Δ9-tetrahydrocannabinol (3 mg / kg / 21 d) reorganizes the disturbed wound healing process and accelerates wound closure in old female mice.. Experimental gerontology, 208, 112832. https://doi.org/10.1016/j.exger.2025.112832
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