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Vitamin D receptor activation: implications for daily practice.

David G Warnock1

  • 1Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Ala., USA.

Contributions to Nephrology
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Summary

Vitamin D receptor activation is crucial for chronic kidney disease (CKD) patients, particularly those with proteinuria. Understanding the difference between 25-OH vitamin D deficiency and VDR activation is key for effective CKD treatment strategies.

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Area of Science:

  • Nephrology
  • Endocrinology
  • Biochemistry

Background:

  • Most clinical studies examine 25-OH vitamin D levels, overlooking the direct effects of vitamin D receptor (VDR) activation.
  • The active form, 1,25-OH(2) vitamin D, is the proximate ligand for VDR, mediating most vitamin D effects.
  • An integrated view of the vitamin D axis is needed, distinguishing substrate deficiency from VDR activation effects.

Purpose of the Study:

  • To highlight the specific need for vitamin D treatment in chronic kidney disease (CKD) patients.
  • To emphasize the importance of VDR activation in CKD, especially in patients with proteinuria.
  • To discuss the interplay of VDR activation, fibroblast growth factor-23, albuminuria, and renal function decline.

Main Methods:

  • Review of existing clinical studies and biochemical pathways.
  • Analysis of the role of VDR activation in the context of CKD progression.
  • Consideration of emerging factors like the FGF23 loop and albuminuria in renal pathophysiology.

Main Results:

  • Distinguishing between 25-OH vitamin D deficiency and direct VDR activation is critical for clinical management of CKD.
  • VDR activation plays a key role in CKD, particularly in proteinuric patients.
  • Albuminuria reflects complex renal function and is linked to proximal tubule health, inflammation, and fibrosis.

Conclusions:

  • New therapeutic strategies targeting the vitamin D axis in CKD require rigorous evaluation.
  • Cost-benefit analyses are essential for assessing novel interventions in CKD.
  • The ultimate success of new therapies will be measured against outcomes like renal replacement therapy and cardiorenal death.