Pathobiology of the Klotho Antiaging Protein and Therapeutic Considerations.
Level 5 - mechanism / opinion, no new human data
Narrative review summarizing preclinical mechanisms and clinical associations without systematic methodology.
PubMed 35903083 · doi:10.3389/fragi.2022.931331
What was done
Narrative review examining the molecular biology, physiological functions, age-related pathological decline, and therapeutic upregulation strategies of the α-Klotho protein based on preclinical models and human clinical studies.
What was found
The abstract provides qualitative mechanistic descriptions without specific numerical data or effect sizes: - Klotho acts as an obligate coreceptor for FGF23 to regulate phosphate and vitamin D metabolism, as well as a soluble endocrine hormone (s-Klotho). - Klotho deficiency in mice causes shortened lifespan, multi-organ atrophy, fibrosis, and vascular/renal pathologies, whereas Klotho overexpression extends lifespan. - Klotho inhibits pro-aging pathways (TGF-β, IGF-1, Wnt, NF-κB) and upregulates antioxidant defenses via Nrf2 and FoxO. - Human Klotho levels decrease with age, chronic kidney disease, diabetes, and Alzheimer's disease, correlating with increased all-cause mortality. - Circulating Klotho is enhanced by exercise, certain pharmaceuticals (RAS inhibitors, fluvastatin, mTOR inhibitors, pentoxifylline, vitamin D, antidiabetics), and various nutraceuticals.
Why it matters
Synthesizes the biological mechanisms linking Klotho decline to multi-system aging pathologies and highlights potential pharmacological and lifestyle approaches to restore circulating Klotho.
Limits
The abstract describes a narrative overview rather than a systematic review or meta-analysis, reporting no search parameters, quantitative estimates, sample sizes, or quality assessments. Preclinical rodent findings are presented alongside human observational data without clear delineation of comparative clinical efficacy.
Cited by
- supports Alpha-Klotho acts on cellular aging through phosphate and vitamin D metabolism pathways.