THC worsened alcohol damage to muscle cell energy production in young rats | Research

The takeaway

In rat skeletal muscles, THC aggravated alcohol-induced mitochondrial respiration impairment, with the most severe effects in young glycolytic muscles.

People interested in the combined health effects of cannabis and alcohol use.

THC aggravated alcohol damage specifically in young glycolytic muscle

What the researchers found

Ethanol impaired mitochondrial respiration in both young and middle-aged rat muscles (35-38% reduction). THC alone had limited effects, but when combined with ethanol, THC significantly worsened the impairment specifically in young glycolytic (fast-twitch) muscles. Oxidative (slow-twitch) muscles were relatively protected.

Why it matters

Cannabis and alcohol are frequently used together, especially by young adults. This study suggests the combination may be more damaging to muscle energy production than either substance alone, particularly in younger individuals.

The numbers in context

Ethanol reduced mitochondrial respiration by 35-38% in gastrocnemius. THC aggravated this effect in young glycolytic muscle. Young (12-week) and middle-aged (49-week) rats compared. Two muscle types tested: glycolytic and oxidative.

How the study worked

Gastrocnemius (glycolytic) and soleus (oxidative) muscles from young (12-week) and middle-aged (49-week) rats were exposed to ethanol alone and combined with THC. Mitochondrial respiration was measured to assess energy production capacity.

What this study cannot tell us

In vitro exposure of muscle tissue does not replicate how THC and alcohol reach muscles in a living body. Concentrations used may not reflect physiological levels. Only rat tissue was studied. The mechanism by which THC worsens ethanol effects was not fully elucidated.

How to read the evidence

Preliminary in vitro study using rat muscle tissue. Identifies a potential interaction but the clinical significance for human cannabis-alcohol co-use is unclear.

When this study was published

Published in 2024 in Biology.

The bigger picture

The interaction between cannabis and alcohol is understudied despite frequent co-use. This finding that THC amplifies alcohol damage to muscle mitochondria adds to a small but growing body of evidence that the combination carries risks beyond either substance alone.

Questions still open

Does combined cannabis-alcohol use impair exercise performance or muscle recovery in humans? Are these mitochondrial effects reversible? Would CBD, which has antioxidant properties, have a different interaction with alcohol in muscle tissue?

Common questions

Is mixing cannabis and alcohol bad for muscles?

This rat tissue study suggests THC can worsen alcohol-induced damage to muscle energy production, particularly in younger fast-twitch muscles. Whether this translates to noticeable effects in humans who combine cannabis and alcohol remains unknown.

Does age matter for these effects?

Yes. The THC-alcohol combination was most damaging in young rat muscles. Middle-aged muscles and slow-twitch oxidative muscles appeared relatively more resistant to the combined effect.

Read the original research

Cannabis (THC) Aggravates the Deleterious Effects of Alcohol (EtOH) on Skeletal Muscles' Mitochondrial Respiration: Modulation by Age and Metabolic Phenotypes.

Biology, 13(12)

View on PubMed ↗Publisher’s paper ↗

Citation

Charles, Anne-Laure; Giannini, Margherita; Meyer, Alain; Charloux, Anne; Talha, Samy; Vogel, Thomas; Raul, Jean-Sébastien; Wolff, Valérie; Geny, Bernard. (2024). Cannabis (THC) Aggravates the Deleterious Effects of Alcohol (EtOH) on Skeletal Muscles' Mitochondrial Respiration: Modulation by Age and Metabolic Phenotypes.. Biology, 13(12). https://doi.org/10.3390/biology13121080