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Updated: May 25, 2026

Differentiation of Functional Osteoclasts from Human Peripheral Blood CD14+ Monocytes
Published on: January 27, 2023
Hypoxia triggers a HIF-mediated differentiation of peripheral blood mononuclear cells into osteoclasts
T C Dandajena1, M A Ihnat, B Disch
1Department of Orthodontics, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73162, USA. tdandajena@msn.com
Background:
The source and mechanisms leading to osteoclast (OC) generation during tooth movement are not clearly understood. We hypothesized that during tooth movement, OC differentiate from peripheral blood mononuclear cells (PBMNC) downstream of the global hypoxia-inducible transcription factor hypoxia-inducible factor (HIF)-1α.
Objective:
The objective of this study was to demonstrate up-regulation of OC growth factors from osteoblasts (OB) and subsequent conversion of PBMNC into functional OC under hypoxic stress.
Material And Methods:
Human primary PBMNC were cocultured with/without OB and subjected to either hypoxia (2.5% O2) or normoxia (21% O2) over 14 days. Levels of HIF, vascular endothelial growth factor (VEGF) and receptor activator for nuclear factor kappa-β ligand (RANKL) were measured. Conversion of PBMNC into OC was measured using resorption and TRAP assays.
Results:
Functional OC were only observed in response to hypoxia during coculture of PBMNC and OB and only after up-regulation of HIF, VEGF and RANKL in the hypoxic conditions. YC-1, a HIF inhibitor, reduced OC formation in response to hypoxia.
Conclusion:
Hypoxia triggers the differentiation of PBMNC into functional OC in the presence of OB in a HIF-dependent manner as would occur during orthodontic loading of the periodontal ligament space.
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