Neuronal Guidance Molecules in Bone Remodeling and Orthodontic Tooth Movement. 2022

Sinan Şen, and Ralf Erber
Department of Orthodontics, University Medical Center Schleswig-Holstein, Campus Kiel, Christian Albrechts University, 24105 Kiel, Germany.

During orthodontic tooth movement, mechanically induced remodeling occurs in the alveolar bone due to the action of orthodontic forces. The number of factors identified to be involved in mechanically induced bone remodeling is growing steadily. With the uncovering of the functions of neuronal guidance molecules (NGMs) for skeletal development as well as for bone homeostasis, NGMs are now also among the potentially significant factors for the regulation of bone remodeling during orthodontic tooth movement. This narrative review attempts to summarize the functions of NGMs in bone homeostasis and provides insight into the currently sparse literature on the functions of these molecules during orthodontic tooth movement. Presently, four families of NGMs are known: Netrins, Slits, Semaphorins, ephrins and Eph receptors. A search of electronic databases revealed roles in bone homeostasis for representatives from all four NGM families. Functions during orthodontic tooth movement, however, were only identified for Semaphorins, ephrins and Eph receptors. For these, crucial prerequisites for participation in the regulation of orthodontically induced bone remodeling, such as expression in cells of the periodontal ligament and in the alveolar bone, as well as mechanical inducibility, were shown, which suggests that the importance of NGMs in orthodontic tooth movement may be underappreciated to date and further research might be warranted.

UI MeSH Term Description Entries
D010513 Periodontal Ligament The fibrous CONNECTIVE TISSUE surrounding the TOOTH ROOT, separating it from and attaching it to the alveolar bone (ALVEOLAR PROCESS). Alveolodental Ligament,Alveolodental Membrane,Gomphosis,Alveolodental Ligaments,Alveolodental Membranes,Gomphoses,Ligament, Alveolodental,Ligament, Periodontal,Membrane, Alveolodental,Periodontal Ligaments
D000071437 Axon Guidance The mechanism by which a neuronal process outgrows toward a target led by the GROWTH CONE. Local guidance cues are provided by cell surface proteins that act on the growing axon. Axon Pathfinding,Axonal Pathfinding,Neural Guidance,Neural Pathfinding,Neurite Guidance,Neuronal Guidance,Neuronal Pathfinding,Pathfinding, Axon
D014087 Tooth Movement Techniques Orthodontic techniques used to correct the malposition of a tooth or teeth. Tooth Depression,Tooth Intrusion,Tooth Movement, Minor,Tooth Uprighting,Orthodontic Tooth Movement,Depression, Tooth,Depressions, Tooth,Intrusion, Tooth,Intrusions, Tooth,Minor Tooth Movement,Minor Tooth Movements,Movement Technique, Tooth,Movement Techniques, Tooth,Movement, Orthodontic Tooth,Movements, Orthodontic Tooth,Orthodontic Tooth Movements,Technique, Tooth Movement,Techniques, Tooth Movement,Tooth Depressions,Tooth Intrusions,Tooth Movement Technique,Tooth Movement, Orthodontic,Tooth Movements, Minor,Tooth Movements, Orthodontic,Tooth Uprightings,Uprighting, Tooth,Uprightings, Tooth
D016723 Bone Remodeling The continuous turnover of BONE MATRIX and mineral that involves first an increase in BONE RESORPTION (osteoclastic activity) and later, reactive BONE FORMATION (osteoblastic activity). The process of bone remodeling takes place in the adult skeleton at discrete foci. The process ensures the mechanical integrity of the skeleton throughout life and plays an important role in calcium HOMEOSTASIS. An imbalance in the regulation of bone remodeling's two contrasting events, bone resorption and bone formation, results in many of the metabolic bone diseases, such as OSTEOPOROSIS. Bone Turnover,Bone Turnovers,Remodeling, Bone,Turnover, Bone,Turnovers, Bone
D036081 Receptors, Eph Family A large family of receptor protein-tyrosine kinases that are structurally-related. The name of this family of proteins derives from original protein Eph (now called the EPHA1 RECEPTOR), which was named after the cell line it was first discovered in: Erythropoietin-Producing human Hepatocellular carcinoma cell line. Members of this family have been implicated in regulation of cell-cell interactions involved in nervous system patterning and development. Eph Family Receptors,Eph Receptor Tyrosine Kinase,Eph Receptors,EphA Receptors,EphB Receptor,EphB Receptors,Ephrin A Receptors,Ephrin B Receptor,Ephrin B Receptors,Ephrin Receptors,Receptor, Ephrin B,Receptors, Eph,Receptors, EphB,Receptors, Ephrin,Receptors, Ephrin A
D036342 Ephrins Signaling proteins that are ligands for the EPH FAMILY RECEPTORS. They are membrane-bound proteins that are attached to the CELL MEMBRANE either through a GLYCOINOSITOL PHOSPHOLIPID MEMBRANE ANCHOR or through a transmembrane domain. Many of the ephrins are considered important intercellular signaling molecules that control morphogenic changes during embryogenesis. Ephrin,Eph Receptor Ligands,Ligands, Eph Receptor,Receptor Ligands, Eph
D039961 Semaphorins A family of proteins that mediate AXONAL GUIDANCE. Semaphorins act as repulsive cues for neuronal GROWTH CONES and bind to receptors on their filopodia. At least 20 different molecules have been described and divided into eight classes based on domain organization and species of origin. Classes 1 and 2 are invertebrate, classes 3-7 are vertebrate, and class V are viral. Semaphorins may be secreted (classes 2, 3, and V), transmembrane (classes 1, 4, 5, and 6), or membrane-anchored (class 7). All semaphorins possess a common 500-amino acid extracellular domain which is critical for receptor binding and specificity, and is also found in plexins and scatter factor receptors. Their C termini are class-specific and may contain additional sequence motifs. Class 1 Semaphorins,Class 2 Semaphorins,Class 3 Semaphorins,Class 4 Semaphorins,Class 5 Semaphorins,Class 6 Semaphorins,Class 7 Semaphorins,Class V Semaphorins,Sema 1,Semaphorin,Semaphorin-1,Semaphorin-2,Semaphorin-3,Semaphorin-4,Semaphorin-5,Semaphorin-6,Semaphorin-7,Semaphorin-V,Semaphorin 1,Semaphorin 2,Semaphorin 3,Semaphorin 4,Semaphorin 5,Semaphorin 6,Semaphorin 7,Semaphorin V,Semaphorins, Class 1,Semaphorins, Class 2,Semaphorins, Class 3,Semaphorins, Class 4,Semaphorins, Class 5,Semaphorins, Class 6,Semaphorins, Class 7,Semaphorins, Class V

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