FGF-23, Klotho and Vitamin D Levels in Scleroderma

Area of Science:

• Endocrinology
• Rheumatology
• Mineral Metabolism

Background:

• Scleroderma is a chronic connective tissue disease with unknown causes.
• Vitamin D, parathyroid hormone (PTH), and Klotho are key regulators of calcium and phosphate homeostasis.
• Klotho, a fibroblast growth factor 23 (FGF-23) co-receptor, influences mineral metabolism.

Purpose of the Study:

• To investigate serum levels of Klotho, FGF-23, intact PTH (iPTH), and vitamin D in scleroderma patients compared to healthy controls.

Main Methods:

• Sixty scleroderma patients and 30 healthy controls were enrolled.
• Serum levels of Klotho, FGF-23, 25-hydroxy vitamin D (25-OH Vit D), and iPTH were measured using ELISA.

Main Results:

• Scleroderma patients exhibited significantly lower serum Klotho and 25-OH Vit D levels (P<0.001).
• Patients with scleroderma had significantly higher serum iPTH levels (P<0.001).
• No significant difference in serum FGF-23 levels was observed between scleroderma patients and controls (P=0.202).

Conclusions:

• Decreased serum Klotho, 25-OH Vit D, and elevated iPTH in scleroderma patients suggest a potential association with disease pathogenesis.
• These altered mineral metabolism markers represent potential future therapeutic targets for scleroderma.