Parathyroid Hormone Modulates Alveolar Bone Metabolism via Inducing Periodontal Ligament Stem Cells Aerobic Glycolysis.
Parathyroid hormone accelerates tooth movement in mice by promoting alveolar bone remodeling and metabolic changes in periodontal ligament stem cells.
Where it sits
this study against the rest of the abaloparatide (tymlos) corpusSummary and findings
The study investigated the effects of parathyroid hormone on alveolar bone metabolism and tooth movement in a mouse model. Parathyroid hormone administration accelerated tooth movement by promoting alveolar bone remodeling and metabolic changes in periodontal ligament stem cells. The hormone enhanced glucose uptake and aerobic glycolysis without affecting the Krebs cycle or oxidative phosphorylation.
Abstract
<h4>Introduction</h4>The objective of this study was to investigate the effects of parathyroid hormone on tooth movement and uncover its mechanism from a metabolic perspective.<h4>Methods</h4>The influences of parathyroid hormone on PDLCs osteogenic differentiation and monocyte osteoclastic differentiation were investigated. According to the RNA-seq analysis, glucose metabolism has been discussed subsequently. Mouse maxillary first molar mesial movement model was constructed to estimate the effects of parathyroid administration on alveolar bone remodelling and tooth movement.<h4>Results</h4>Parathyroid administration accelerated mouse maxillary first molar mesial movement by promoting alveolar bone remodelling. The expression of osteogenic markers and the number and surface of osteoclast cells were promoted. Parathyroid hormone administration facilitates PDLCs osteogenic differentiation and monocytes osteoclastic differentiation synchronously. RNA-seq indicated that parathyroid administration mainly affects the metabolism and cellular signalling of PDLCs. Parathyroid administration enhanced glucose uptake, glucose consumption and aerobic glycolysis of PDLCs while exhibiting no obvious effects on the Krebs cycle and oxidative phosphorylation. Moreover, mitochondrial fission of PDLCs was promoted after parathyroid administration. Furthermore, results indicated that parathyroid administration promoted the expression of GLUT1, HK1 and LDHA. Inhibition of mitochondrial midzone fission partially alleviated the osteo-inductive effects of parathyroid hormone.<h4>Conclusions</h4>Collectively, parathyroid hormone regulates PDLCs aerobic glycolysis and mitochondrial fission to promote alveolar bone remodelling, and metabolic reprogramming is of vital importance in the processes of orthodontic tooth movement.<h4>Clinical relevance</h4>This study elucidates the role of metabolites associated with parathyroid hormones in tooth movement, and lays a foundation for regulating the speed of tooth movement by monitoring their activity.
Background
The study addresses the role of parathyroid hormone in modulating alveolar bone metabolism, particularly in the context of orthodontic tooth movement. Prior research has established the hormone's involvement in bone remodeling, but its metabolic mechanisms in this specific context were not fully understood. Understanding these mechanisms could inform strategies to regulate tooth movement speed in orthodontic treatments.
Methods
The study utilized a mouse model to investigate the effects of parathyroid hormone on alveolar bone remodeling and tooth movement. The researchers examined osteogenic differentiation of periodontal ligament stem cells (PDLCs) and osteoclastic differentiation of monocytes. RNA-seq analysis was used to explore changes in glucose metabolism. The primary outcomes included changes in osteogenic markers, osteoclast cell numbers, and metabolic activity in PDLCs.
Results
Parathyroid hormone administration accelerated the mesial movement of the mouse maxillary first molar by promoting alveolar bone remodeling. It increased the expression of osteogenic markers and the number and surface area of osteoclast cells. The hormone facilitated osteogenic differentiation of PDLCs and osteoclastic differentiation of monocytes. RNA-seq analysis showed that parathyroid hormone primarily affected PDLCs' metabolism and cellular signaling, enhancing glucose uptake, consumption, and aerobic glycolysis, while not significantly impacting the Krebs cycle or oxidative phosphorylation.
Interpretation
The study provides mechanistic insights into how parathyroid hormone influences alveolar bone remodeling and tooth movement through metabolic pathways. The findings align with previous knowledge of the hormone's role in bone metabolism but highlight specific metabolic reprogramming in PDLCs. While the results are statistically significant, their clinical significance remains uncertain due to the study's preclinical nature and lack of direct human data. The reliance on a mouse model limits the generalizability of the findings to human orthodontic practice.
Key findings
- Parathyroid administration accelerated mouse maxillary first molar mesial movement.
- Osteogenic markers and osteoclast cell numbers and surfaces were promoted.
- Enhanced glucose uptake, glucose consumption, and aerobic glycolysis in PDLCs.
- No obvious effects on the Krebs cycle and oxidative phosphorylation.
- Promoted expression of GLUT1, HK1, and LDHA.
Limitations
- Mouse model, not human data.
- Preclinical study, no direct clinical outcomes.
- Focus on metabolic pathways without long-term follow-up.