SIRT6 and Neurodegenerative⁤ Disease: A New Therapeutic Target

Tryptophan, frequently enough associated with sleep, plays a crucial role in brain health,⁣ contributing to⁣ protein synthesis, energy production (NAD+), and the creation of vital neurotransmitters like serotonin and melatonin. Disruptions in⁣ tryptophan metabolism are increasingly linked to aging, ⁤neurodegenerative ⁣diseases, and psychiatric disorders, leading to mood disturbances, impaired learning, and⁤ sleep problems.⁢ Recent research has pinpointed a key regulator of this process: the Sirtuin 6 (SIRT6) protein.

The Role of SIRT6 in Brain ⁢Chemistry

Researchers ⁣at Ben-Gurion University of the Negev, led⁢ by Prof.⁤ Debra Toiber, have ⁤discovered that declining levels⁣ of⁢ SIRT6 are a major driver ⁢of metabolic imbalances in ⁤the brain. Their work, published in ⁤ Nature Communications, demonstrates that SIRT6 controls gene expression related⁤ to tryptophan metabolism (including⁤ TDO2 and AANAT). When SIRT6 levels decrease, this control is lost, leading to a⁢ shift in tryptophan‍ processing.

Specifically,tryptophan is ⁤increasingly diverted towards the kynurenic pathway,which produces neurotoxic⁢ compounds. Together, ⁤the production⁣ of ‍protective neurotransmitters⁢ like serotonin and melatonin declines. This imbalance contributes to the ⁢progression⁤ of neurological issues.

Experimental Evidence

The research ⁢team conducted experiments⁤ using ⁤cells, Drosophila (fruit flies), and ⁣mouse models to validate ⁤their findings. In⁣ a SIRT6 knockout fly model, blocking the enzyme TDO2 significantly improved movement problems and reduced the formation of vacuoles – indicators of brain tissue damage. This suggests that targeting TDO2 could offer a therapeutic avenue for mitigating the effects of SIRT6 loss.

Therapeutic ⁢implications and Future Research

prof. ⁣Toiber emphasizes that their research identifies SIRT6 as a critical upstream drug target for combating neurodegenerative pathology. The finding that the damage caused by SIRT6 loss is ⁤perhaps reversible offers a promising window for therapeutic intervention. Further research is needed to develop⁣ strategies⁣ to boost SIRT6 levels ⁣or counteract the effects of its decline.

Research Support

This study was supported by ‍several organizations, including:

• European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (grant agreement No⁤ 849029)
• David and Inez Myers foundation
• Israeli Ministry of Science and Technology (MOST)
• High-tech, Bio-tech and negev fellowships of Kreitman School of⁤ Advanced Research of Ben-Gurion⁣ University
• The Israel Science Foundation⁣ (Grant no. 422/23)
• Russian Science Foundation (grant number ⁢25-71-20017) – ⁣for RNA-seq data analysis

key Takeaways

• Declining SIRT6 ⁣levels disrupt tryptophan metabolism in the brain.
• this disruption leads⁢ to increased production of neurotoxic compounds and decreased production of protective neurotransmitters.
• Blocking the TDO2 enzyme can reverse‍ some of the damage caused ‍by SIRT6 loss.
• SIRT6 represents a promising therapeutic target for neurodegenerative diseases.

Publication Date: 2026/01/17 02:16:37