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Turning over renal osteodystrophy dogma: direct actions of FGF23 on osteoblast β-catenin pathway

Susan C Schiavi1, Rosa M A Moysés2

  • 1PreciThera, Montreal, Quebec, Canada.

Kidney International
|June 18, 2016
PubMed

Insights

Chronic kidney disease (CKD) mineral and bone disorder (CKD-MBD) involves Wnt/β-catenin pathway inhibition. FGF23-Klotho directly increases DKK1 expression in osteoblasts, contributing to CKD-MBD.

Area of Science:

  • Nephrology
  • Endocrinology
  • Bone Biology

Background:

  • Chronic kidney disease (CKD) is linked to mineral and bone disorder (CKD-MBD).
  • Sclerostin's inhibition of the Wnt/β-catenin pathway in osteocytes is implicated in CKD-MBD.
  • The precise mechanisms underlying CKD-MBD pathophysiology require further elucidation.

Purpose of the Study:

  • To investigate the role of Wnt/β-catenin pathway inhibition in CKD-MBD.
  • To explore the direct effects of FGF23-Klotho on osteoblasts and their contribution to CKD-MBD.

Main Methods:

  • Utilized an experimental model of chronic kidney disease (CKD).
  • Assessed the expression of Wnt/β-catenin pathway inhibitors, including DKK1.
  • Examined the direct actions of FGF23-Klotho on osteoblast function.

Main Results:

  • Confirmed sclerostin-mediated inhibition of the Wnt/β-catenin pathway in osteocytes within a CKD model.
  • Demonstrated direct effects of FGF23-Klotho on osteoblasts.
  • Showed that FGF23-Klotho increases the expression of DKK1, a Wnt/β-catenin pathway inhibitor, in osteoblasts.

Conclusions:

  • Sclerostin plays a role in CKD-MBD pathophysiology through Wnt/β-catenin pathway inhibition.
  • FGF23-Klotho directly influences osteoblasts, upregulating DKK1 expression.
  • These findings provide new insights into the complex mechanisms of CKD-MBD.

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