New research reveals that long-term treatment with THC may have cognitive-enhancing and anti-aging benefits.

Researchers from University Hospital Bonn and the University of Bonn in Germany, in collaboration with a team from the Hebrew University of Jerusalem in Israel, have demonstrated in animal studies that low-dose, long-term use of cannabis not only reverses age-related brain decline, but also exerts anti-aging effects.

The findings were published in the journal ACS Pharmacology & Translational Science.

The Role of the mTOR Protein (Mammalian Target of Rapamycin) in Metabolic and Cognitive Performance

The research team points out that a key factor in this process is the mTOR protein (mechanistic Target of Rapamycin)—a central molecular switch that regulates cell growth and metabolism, thereby influencing both cognitive function and metabolic processes in the human body.

mTOR serves as a central regulator of ribosome biogenesis, protein synthesis, cell growth, and synaptic plasticity. The mTOR kinase controls translational mechanisms in response to amino acids and growth factors by activating p70 ribosomal S6 kinase (p70S6K) and inhibiting the eIF-4E-binding protein (4E-BP1).

mTOR operates within the PI3K signaling pathway, which is activated by insulin, nutrients, and growth factors. This pathway involves the Akt kinase, an upstream regulator of mTOR. Rapamycin, an effective immunosuppressant and investigational anti-cancer agent, inhibits mTOR, blocks protein synthesis, and arrests the cell cycle in the G1 phase. A growing body of evidence supports mTOR’s critical role in cell signaling pathways related to cell growth and proliferation.

Recent findings suggest that mTOR is also involved in signaling pathways activated by microtubule-disrupting agents such as paclitaxel and nocodazole. These drugs, which affect microtubule integrity, can trigger apoptotic pathways by inducing phosphorylation and inactivation of the anti-apoptotic protein Bcl-2 during the G2-M phase.

Information regarding resource availability or scarcity is essential for regulating metabolism. The so-called metabolome represents a complex network of reactions encompassing all metabolic activities within a cell or tissue. As a sensitive intracellular energy-sensing system, the metabolome plays a major role in aging through its regulation of cellular metabolic activity.

Thus, reducing mTOR activity through calorie restriction, intense physical activity, or pharmacological intervention has been widely recognized for its anti-aging effects. However, brain aging is also characterized by a decline in synaptic plasticity, i.e., the ability of neurons to form new connections. Lower mTOR activity can negatively affect the aging brain by reducing the formation of new synapses, which in turn impairs cognitive function.

To address this, Professor Andreas Zimmer, Director of the Institute of Molecular Psychiatry at the University of Bonn and a member of the ImmunoSensation2 Cluster of Excellence, explained:

“Anti-aging strategies based on reduced mTOR activity may not only be ineffective in the brain, but potentially counterproductive. In our current study, we have identified a strategy to resolve this dilemma.”

Cannabis May Reverse Brain Aging

In previous research, scientists from the University of Bonn in collaboration with the Hebrew University of Jerusalem demonstrated that long-term, low-dose intake of tetrahydrocannabinol (THC)—the psychoactive compound in cannabis—can restore cognitive function and synaptic density in aging mice, thereby exerting anti-aging effects on the brain.

However, whether changes in mTOR signaling and the metabolome contribute to these positive effects on the aging brain remained an open question.

 “We have now been able to show that THC treatment has tissue-specific and dual effects on mTOR signaling and the metabolome,” explained Dr. Andras Bilkei-Gorzo from the Institute of Molecular Psychiatry at University Hospital Bonn, who is also a researcher at the University of Bonn.

THC treatment led to a temporary increase in mTOR activity in the brain, along with elevated levels of energy-related intermediates and amino acids, which promote the synthesis of synaptic proteins and the formation of new synapses.

Interestingly, researchers also observed that mTOR activity in adipose tissue and levels of amino acids and carbohydrate metabolites in plasma were significantly reduced following caloric restriction or intense physical activity in mice.

Dr. Bilkei-Gorzo noted:

 “Based on these results, we conclude that long-term low-dose THC treatment initially enhances cognition by boosting energy production and synaptic protein synthesis in the brain, and subsequently exerts anti-aging effects through the downregulation of mTOR activity and peripheral metabolic processes.”

In conclusion, Dr. Bilkei-Gorzo summarized:

 “Our study suggests that the dual impact on mTOR activity and the metabolome may form the basis for the development of effective anti-aging and cognitive-enhancing therapeutics.”

This groundbreaking finding indeed restores THC’s image, highlighting its angelic side once more.