l-Theanine improves learning and memory by inhibiting NOX4-mediated ferroptosis in hippocampal neurons of sleep-deprived mice
In sleep-deprived mice, l-theanine treatment significantly increased the frequency of crossing the platform in the Morris water maze, indicating improved learning and memory. It also protected hippocampal neurons and mitochondria, reversed abnormal expression of ferroptosis-related proteins (e.g., NOX4, GPX4, ACSL4), and mitigated oxidative stress in HT22 cells. The neuroprotective effects were reversed by the GLX351322 agent, confirming the role of NOX4 inhibition.
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L-Theanine improves learning and memory by inhibiting NOX4-mediated ferroptosis in hippocampal neurons of sleep-deprived mice The current body of evidence comprises 1 study. EvidenceHub rates the overall confidence at 26/100 (low).
The Claim
l-Theanine improves learning and memory by inhibiting NOX4-mediated ferroptosis in hippocampal neurons of sleep-deprived mice
This conclusion is most relevant to: Sleep-deprived mice (C57BL/6 strain implied) and HT22 mouse hippocampal neuronal cell line.
What the Research Shows
The conclusion draws on 1 linked study. Highlights from the cited literature:
- ▸l-Theanine Improves Learning and Memory Through Attenuation of NOX4-Mediated Ferroptosis in Hippocampal Neurons of Sleep-Deprived Mice. (Phytotherapy research : PTR, 2025) —
How It Works
The proposed biological pathway:
- ▸Sleep deprivation increases NOX4 expression in hippocampal neurons
- ▸NOX4 upregulation promotes ferroptosis via oxidative stress and iron accumulation
- ▸l-Theanine attenuates NOX4 expression, reducing ferroptosis markers (e.g., GPX4, SLC7A11, FTH1)
- ▸Result: Improved learning and memory in sleep-deprived mice
Who Might Benefit
Evidence fit by population:
- ▸Sleep-deprived mice (C57BL/6 strain implied) and HT22 mouse hippocampal neuronal cell line
Recommended Dose
N/A (not specified in abstract)
Limitations & Caveats
Important context when interpreting this evidence:
- ▸Dosage of l-theanine not specified in abstract, limiting translational applicability
- ▸Study conducted in animal models (mice and cell lines), not in humans
- ▸Mechanism focused on NOX4 pathway; other potential pathways not explored
Frequently Asked Questions
What is the main finding of this study?▼
l-Theanine improves learning and memory in sleep-deprived mice by inhibiting NOX4-mediated ferroptosis in hippocampal neurons.
How was learning and memory measured?▼
Using the Morris water maze (MWM) test, specifically the frequency of crossing the platform.
What is ferroptosis and why is it relevant?▼
Ferroptosis is an iron-dependent form of cell death involving oxidative stress. The study shows that sleep deprivation triggers ferroptosis in hippocampal neurons via NOX4, and l-theanine blocks this process.
Could l-theanine be used for human sleep deprivation?▼
This is an animal study, so human trials are needed. However, l-theanine is known for its antioxidative properties and is already used as a supplement.
References
- 1.Huang X, Lu X, Wu Z, Wu H, Xie Z, Cao Y. “l-Theanine Improves Learning and Memory Through Attenuation of NOX4-Mediated Ferroptosis in Hippocampal Neurons of Sleep-Deprived Mice..” Phytotherapy research : PTR, 2025. PMID: 40682446 DOI: 10.1002/ptr.70048