THC and alcohol together caused worse heart cell damage in older rat hearts
THC dose-dependently impaired cardiac mitochondrial respiration, with effects nearly doubled in aged rat hearts and worsened further when combined with alcohol.
Quick Facts
What This Study Found
THC impaired cardiac mitochondrial respiration in both young and old rats, but the effect was significantly worse in aged hearts (97.5% vs. 75.6% impairment at the same dose, with a lower IC50). Combining THC with ethanol enhanced the damage further, and aged hearts produced significantly more reactive oxygen species after THC exposure.
Key Numbers
Old rats: 97.5% mitochondrial respiration impairment vs. 75.6% in young at 2x10-5 M THC. IC50 in old: 0.7 vs. 1.3 x10-5 M in young. ROS production 46.6% higher in old vs. 17.9% in young after THC.
How They Did This
Isolated cardiac mitochondria from young (12-week) and old (90-week) rats were exposed to increasing doses of THC, ethanol, or their combination. Mitochondrial respiration and hydrogen peroxide production were measured.
Why This Research Matters
Older adults are an increasingly common cannabis user demographic, and many also consume alcohol. This study suggests aging hearts may be more vulnerable to THC-related mitochondrial damage, especially when alcohol is involved.
The Bigger Picture
Cannabis use among older adults is rising faster than any other age group. Combined with the high prevalence of alcohol use among seniors, this finding about synergistic cardiac mitochondrial damage has relevance for clinical guidance about substance use in aging populations.
What This Study Doesn't Tell Us
In vitro study on isolated mitochondria, not whole hearts or living organisms. Concentrations may not reflect physiological levels. Rat cardiac tissue may respond differently than human tissue. Only acute exposure tested.
Questions This Raises
- ?Do elderly cannabis users show clinical signs of cardiac mitochondrial dysfunction?
- ?Would lower, more realistic THC concentrations still show age-dependent effects?
- ?Does CBD have protective properties against these mitochondrial effects?
Trust & Context
- Key Stat:
- 97.5% mitochondrial impairment in aged hearts vs. 75.6% in young
- Evidence Grade:
- Preliminary in vitro study on isolated rat cardiac mitochondria. Provides mechanistic data but cannot predict clinical outcomes in human cannabis users.
- Study Age:
- Published in 2024 in the International Journal of Molecular Sciences.
- Original Title:
- Cumulative Deleterious Effects of Tetrahydrocannabinoid (THC) and Ethanol on Mitochondrial Respiration and Reactive Oxygen Species Production Are Enhanced in Old Isolated Cardiac Mitochondria.
- Published In:
- International journal of molecular sciences, 25(3) (2024)
- Authors:
- Charles, Anne-Laure(2), Charloux, Anne(2), Vogel, Thomas(2), Raul, Jean-Sébastien, Kindo, Michel, Wolff, Valérie, Geny, Bernard
- Database ID:
- RTHC-05193
Evidence Hierarchy
Frequently Asked Questions
Is cannabis more dangerous for older hearts?
In this lab study, isolated heart mitochondria from aged rats showed nearly double the damage from THC compared to young rat hearts, and produced more harmful reactive oxygen species. Whether this translates to clinical heart problems in older cannabis users is not yet known.
Does mixing cannabis and alcohol make it worse?
Yes, in this study. Combining THC with ethanol enhanced the damage to cardiac mitochondria beyond either substance alone, with the effect being most pronounced in aged heart tissue.
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Cite This Study
https://rethinkthc.com/research/RTHC-05193APA
Charles, Anne-Laure; Charloux, Anne; Vogel, Thomas; Raul, Jean-Sébastien; Kindo, Michel; Wolff, Valérie; Geny, Bernard. (2024). Cumulative Deleterious Effects of Tetrahydrocannabinoid (THC) and Ethanol on Mitochondrial Respiration and Reactive Oxygen Species Production Are Enhanced in Old Isolated Cardiac Mitochondria.. International journal of molecular sciences, 25(3). https://doi.org/10.3390/ijms25031835
MLA
Charles, Anne-Laure, et al. "Cumulative Deleterious Effects of Tetrahydrocannabinoid (THC) and Ethanol on Mitochondrial Respiration and Reactive Oxygen Species Production Are Enhanced in Old Isolated Cardiac Mitochondria.." International journal of molecular sciences, 2024. https://doi.org/10.3390/ijms25031835
RethinkTHC
RethinkTHC Research Database. "Cumulative Deleterious Effects of Tetrahydrocannabinoid (THC..." RTHC-05193. Retrieved from https://rethinkthc.com/research/charles-2024-cumulative-deleterious-effects-of
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkTHC research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.