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The Vitamin D-Sirt1/PGC1α Axis Regulates Bone Metabolism and Counteracts Osteoporosis

Cuicui Yang1, Lulu Chen1, Xiaoli Guo1

  • 1The Research Center for Bone and Stem Cells, Department of Anatomy, Histology and Embryology, Nanjing Medical University, Nanjing, China.

Journal of Orthopaedic Translation
|February 3, 2025
PubMed
Abstract

Insights

Vitamin D deficiency accelerates bone loss by reducing Sirt1. Restoring Sirt1, via the vitamin D-Sirt1/PGC1α axis, combats osteoporosis by improving bone formation and reducing resorption.

Area of Science:

  • Endocrinology
  • Bone Biology
  • Molecular Biology

Background:

  • Vitamin D insufficiency is a primary driver of osteoporosis.
  • The vitamin D-Sirt1/PGC1α axis's role in bone metabolism requires elucidation.
  • Understanding these mechanisms can reveal new osteoporosis treatments.

Purpose of the Study:

  • To investigate how the vitamin D-Sirt1/PGC1α axis regulates bone metabolism.
  • To determine the axis's role in counteracting osteoporosis caused by vitamin D insufficiency.

Main Methods:

  • Utilized Sirt1 transgenic and vitamin D-deficient mouse models.
  • Assessed bone parameters via radiography, micro-CT, and histology.
  • Employed in vitro studies with bone marrow-derived mesenchymal stem cells (BM-MSCs) and molecular analyses.

Main Results:

  • Vitamin D insufficiency decreased Sirt1, accelerating bone loss.
  • Sirt1 overexpression in BM-MSCs reversed bone loss, reducing senescence and promoting osteogenesis.
  • Vitamin D upregulated Sirt1 transcriptionally; resveratrol mimicked these effects via the Sirt1/PGC1α axis.

Conclusions:

  • The vitamin D-Sirt1/PGC1α axis is crucial for bone metabolism and preventing osteoporosis.
  • Targeting this axis offers a potential therapeutic strategy for osteoporosis.
Keywords:
1,25(OH)2D insufficiencyOsteoporosisOverexpression of Sirt1PGC1αResveratrol

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