Circulating Klotho levels: clinical relevance and relationship with tissue Klotho expression

Area of Science:

• Biochemistry
• Nephrology
• Endocrinology

Background:

• Klotho is a protein with crucial paracrine and endocrine functions.
• Expression of Klotho is significantly reduced in various tissues affected by chronic kidney disease (CKD).
• This reduction is implicated in CKD complications, acting through both fibroblast growth factor-23 (FGF23)-dependent and independent pathways.

Purpose of the Study:

• To investigate the role of decreased Klotho expression in chronic kidney disease (CKD).
• To explore the diagnostic challenges associated with Klotho deficiency.
• To evaluate the clinical relevance of circulating Klotho levels and their correlation with tissue concentrations.

Main Methods:

• Review of existing literature on Klotho protein and chronic kidney disease.
• Analysis of studies investigating Klotho expression in CKD tissues.
• Examination of research on the relationship between serum Klotho levels and tissue Klotho concentration.

Main Results:

• Decreased Klotho expression is a hallmark of chronic kidney disease (CKD).
• The precise role of Klotho in CKD pathogenesis, including FGF23-dependent and independent mechanisms, requires further elucidation.
• Clinical diagnosis of Klotho deficiency remains challenging.
• Serum Klotho levels may not accurately represent Klotho concentrations within tissues.

Conclusions:

• Reduced Klotho expression is linked to chronic kidney disease (CKD) complications.
• Further research is needed to clarify the diagnostic utility of serum Klotho levels.
• Accurate assessment of tissue Klotho concentration is critical for understanding its role in CKD.