Klotho
Research OnlyAn anti-aging transmembrane protein linked to longevity in animal models. Mouse studies demonstrate 15-20% lifespan extension. Primate cognition data published in Nature Aging. Klotho Neurosciences developing therapeutic applications for neurodegenerative disease.
Alpha-Klotho · KL protein · Anti-aging protein
8 human studies
- Preclinical
- 78%
- Human research
- 18%
Based on 45 cited sources
Numeric assessment unreviewed
A historical numeric score is recorded but has not passed a current, compound-specific assessment review. No numeric score is displayed.
This is a limitation of the numeric assessment, not a measured absence of benefit. It does not re-review the separately recorded catalogue classification or establish efficacy or safety.
How It Works (Simplified)
Klotho is a naturally occurring transmembrane protein discovered in 1997 (PMID: 9363890) that functions as an aging suppressor. Mice deficient in klotho exhibit accelerated aging (PMID: 9363890), while overexpression of klotho extends lifespan (PMID: 16123266). The protein circulates in a soluble form (shed from cell membranes) and acts as a hormone influencing multiple organ systems including brain, kidney, and cardiovascular tissue.
Scientific Pathways
FGF23 Co-Receptor: Klotho serves as an obligate co-receptor for fibroblast growth factor 23 (FGF23), regulating phosphate metabolism and vitamin D synthesis in the kidney. This axis is critical for mineral homeostasis and its dysregulation contributes to age-related disease.
Wnt Signaling Inhibition: Klotho suppresses Wnt signaling, which when overactive drives cellular senescence and tissue fibrosis — key features of aging.
Neuroprotection: Soluble klotho enhances synaptic plasticity and cognitive function. Primate studies published in Nature Aging demonstrated cognitive enhancement following klotho administration, representing a major translational advance.
Antioxidant Defense: Klotho upregulates manganese superoxide dismutase (MnSOD) expression, reducing oxidative stress at the cellular level.
Clinical Evidence
Epidemiological Data: Human genetic studies show that klotho gene variants (KL-VS) are associated with longevity, higher cognitive function, and reduced cardiovascular disease risk. Carriers of the KL-VS heterozygous variant show enhanced cognition across age groups.
Primate Cognition Study: A landmark study in aged rhesus macaques demonstrated that a single administration of low-dose (but not high-dose) klotho protein enhanced memory, suggesting systemic low-dose klotho may prove therapeutic in aging humans (PMID: 37400721, Castner et al., Nature Aging 2023).
Mouse Longevity Data: Transgenic mice overexpressing klotho live longer than wild-type controls, with klotho functioning as a circulating anti-aging hormone that represses insulin/IGF1 signaling (PMID: 16123266, Kurosu et al. 2005).
Safety Profile
As a naturally occurring human protein, klotho has a favorable theoretical safety profile. However, therapeutic development is in early stages with no human clinical trials completed. Potential concerns include the complexity of recombinant protein manufacturing, delivery challenges (blood-brain barrier penetration for neurological applications), and unknown effects of supraphysiological klotho levels in humans.
Important Limitations
- No human clinical trials completed for therapeutic klotho administration
- Recombinant protein delivery challenges (stability, half-life, BBB penetration)
- Epidemiological associations do not prove causation
- Mouse lifespan data may not directly translate to humans
- Commercial therapeutic development is in very early stages
- Klotho levels decline naturally with age; restoration vs augmentation is an open question
Epithalon
CompatibleDifferent anti-aging mechanisms. Klotho modulates FGF23/mineral metabolism while epithalon targets telomerase. No known interactions.
Humanin
CompatibleBoth are longevity-associated proteins with non-overlapping mechanisms. Klotho targets FGF23/Wnt signaling while humanin is mitochondrial-derived.
Research Note: Interaction data is based on published literature, mechanistic understanding, and theoretical considerations. Most peptide combinations lack direct clinical study. This information is for educational purposes only and does not constitute medical advice. Always consult qualified healthcare providers.
Use the source links in the research discussion above to inspect the referenced records.
This dossier synthesizes available evidence from peer-reviewed literature, regulatory documents, and clinical trial registries. Evidence strength labels summarize the cited material for this entry and should be read alongside its population, model, and study limitations.
For complete methodology details, see our Methodology page.
Important Disclaimer
This dossier is for educational purposes only and does not constitute medical advice. Always consult a qualified healthcare provider before making health decisions.
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