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Wnt Antagonists in Hematopoietic and Immune Cell Fate: Implications for Osteoporosis Therapies

Betsabel Chicana1, Cristine Donham1, Alberto J Millan1

  • 1Quantitative and Systems Biology Graduate Program, University of California, Merced, CA, USA.

Current Osteoporosis Reports
|March 6, 2019
PubMed
Abstract

Insights

Wnt antagonists sclerostin (Sost) and Sostdc1 impact bone homeostasis and immune cell development. Their depletion affects B cell and natural killer cell function, with implications for bone disease therapies and cancer immunotherapies.

Area of Science:

  • Bone biology
  • Immunology
  • Cellular pathways

Background:

  • Sclerostin (Sost) and Sostdc1 are key Wnt antagonists regulating bone homeostasis.
  • Hypoxia-inducible factor (Hif) and von Hippel-Lindau (Vhl) pathways influence Sost expression.
  • Bone microenvironment alterations impact hematopoietic cells.

Purpose of the Study:

  • Review the roles of Sost and Sostdc1 in bone homeostasis.
  • Examine the Hif/Vhl pathway's effect on Sost expression.
  • Investigate the impact of Sost, Sostdc1, and Vhl depletion on hematopoietic cells.

Main Methods:

  • Literature review of current research.
  • Analysis of knockout mouse models (Sost, Sostdc1, Vhl).
  • Examination of cellular and molecular mechanisms.

Main Results:

  • Sost deficiency impairs B cell development; Vhl deficiency exacerbates this effect.
  • Sostdc1 deficiency leads to defects in natural killer cell development and cytotoxicity.
  • Bone microenvironment changes due to Sost/Sostdc1 depletion affect immune cell function.

Conclusions:

  • Sost and Sostdc1 play critical roles in immune cell development and function.
  • Understanding these roles is crucial for patients undergoing Wnt antagonist therapies for bone diseases.
  • Potential applications include cancer immunotherapy, stem cell transplantation, and immune cell differentiation.
Keywords:
Cell differentiationHematopoiesisImmunologyOsteoimmunologyWntWnt antagonists

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