Journal
JOURNAL OF MOLECULAR HISTOLOGY
Volume 51, Issue 6, Pages 649-658Publisher
SPRINGER
DOI: 10.1007/s10735-020-09911-7
Keywords
HIF-1 alpha; Hypoxia; External resorption; Osteoclastogenesis; Periodontitis
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Funding
- Clinical Medicine Science and Technology Innovation Plan of Jinan [201907099]
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Whether external root resorption is associated with hypoxia in the periodontal ligaments of teeth with severe periodontitis remains unclear. Hypoxia inducible factor-1 alpha (HIF-1 alpha) expression and external resorption sites in the periodontal ligaments of these teeth were observed to elaborate upon the relationship between hypoxia and external root resorption in severe periodontitis. Histological analysis was performed to observe external root resorption. The expressions of HIF-1 alpha and Nuclear factor-activated T cells c1 (NFATc1) in the periodontal ligaments were detected by immunofluorescence, western blotting and real-time PCR. Bone marrow macrophages (BMMs) were stimulated by Porphyromonas gingivalis lipopolysaccharide (Pg.LPS) and cultured under hypoxia in vitro. High levels of HIF-1 alpha and NFATc1 were detected in severe periodontitis. HIF-1 alpha positive-cells were observed in the external resorption sites. Hypoxia promoted Pg.LPS-stimulated osteoclastogenesis of BMMs and bone resorption by the NFATc1 pathway. Increased HIF-1 alpha in severe periodontitis are associated with external root resorption by the NFATc1 pathway.
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