Role of CCR2 in orthodontic tooth movement. 2012

Silvana Rodrigues de Albuquerque Taddei, and Ildeu Andrade, and Celso Martins Queiroz-Junior, and Thiago Pompermaier Garlet, and Gustavo Pompermaier Garlet, and Fernando de Queiroz Cunha, and Mauro Martins Teixeira, and Tarcília Aparecida da Silva
Laboratory of Immunopharmacology, Department of Biochemistry and Immunology, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil.

BACKGROUND Cytokines and chemokines regulate bone remodeling during orthodontic tooth movement. CC chemokine ligand 2 (CCL2) is involved in osteoclast recruitment and activity, and its expression is increased in periodontal tissues under mechanical loading. In this study, we investigated whether the CC chemokine receptor 2 (CCR2)-CCL2 axis influences orthodontic tooth movement. METHODS A coil spring was placed in CCR2-deficient (CCR2(-/-)), wild-type, vehicle-treated, and P8A-treated (CCL2 analog) mice. In a histopathologic analysis, the amounts of orthodontic tooth movement and numbers of osteoclasts were determined. The expression of mediators involved in bone remodeling was evaluated by real-time polymerase chain reaction. RESULTS Orthodontic tooth movement and the number of TRAP-positive cells were significantly decreased in CCR2(-/-) and P8A-treated mice in relation to wild-type and vehicle-treated mice, respectively. The expressions of RANKL, RANK, and osteoblasts markers (COL-1 and OCN) were lower in CCR2(-/-) than in wild-type mice. No significant difference was found in osteoprotegerin levels between the groups. CONCLUSIONS These data suggested a reduction of osteoclast and osteoblast activities in the absence of CCR2. The CCR2-CCL2 axis is positively associated with osteoclast recruitment, bone resorption, and orthodontic tooth movement. Therefore, blockage of the CCR2-CCL2 axis might be used in the future for modulating the extent of orthodontic tooth movement.

UI MeSH Term Description Entries
D007527 Isoenzymes Structurally related forms of an enzyme. Each isoenzyme has the same mechanism and classification, but differs in its chemical, physical, or immunological characteristics. Alloenzyme,Allozyme,Isoenzyme,Isozyme,Isozymes,Alloenzymes,Allozymes
D008807 Mice, Inbred BALB C An inbred strain of mouse that is widely used in IMMUNOLOGY studies and cancer research. BALB C Mice, Inbred,BALB C Mouse, Inbred,Inbred BALB C Mice,Inbred BALB C Mouse,Mice, BALB C,Mouse, BALB C,Mouse, Inbred BALB C,BALB C Mice,BALB C Mouse
D008815 Mice, Inbred Strains Genetically identical individuals developed from brother and sister matings which have been carried out for twenty or more generations, or by parent x offspring matings carried out with certain restrictions. All animals within an inbred strain trace back to a common ancestor in the twentieth generation. Inbred Mouse Strains,Inbred Strain of Mice,Inbred Strain of Mouse,Inbred Strains of Mice,Mouse, Inbred Strain,Inbred Mouse Strain,Mouse Inbred Strain,Mouse Inbred Strains,Mouse Strain, Inbred,Mouse Strains, Inbred,Strain, Inbred Mouse,Strains, Inbred Mouse
D009969 Orthodontic Wires Wires of various dimensions and grades made of stainless steel or precious metal. They are used in orthodontic treatment. Orthodontic Wire,Wire, Orthodontic,Wires, Orthodontic
D010006 Osteoblasts Bone-forming cells which secrete an EXTRACELLULAR MATRIX. HYDROXYAPATITE crystals are then deposited into the matrix to form bone. Osteoblast
D010010 Osteoclasts A large multinuclear cell associated with the BONE RESORPTION. An odontoclast, also called cementoclast, is cytomorphologically the same as an osteoclast and is involved in CEMENTUM resorption. Odontoclasts,Cementoclast,Cementoclasts,Odontoclast,Osteoclast
D001862 Bone Resorption Bone loss due to osteoclastic activity. Bone Loss, Osteoclastic,Osteoclastic Bone Loss,Bone Losses, Osteoclastic,Bone Resorptions,Loss, Osteoclastic Bone,Losses, Osteoclastic Bone,Osteoclastic Bone Losses,Resorption, Bone,Resorptions, Bone
D002452 Cell Count The number of CELLS of a specific kind, usually measured per unit volume or area of sample. Cell Density,Cell Number,Cell Counts,Cell Densities,Cell Numbers,Count, Cell,Counts, Cell,Densities, Cell,Density, Cell,Number, Cell,Numbers, Cell
D002634 Chemotaxis, Leukocyte The movement of leukocytes in response to a chemical concentration gradient or to products formed in an immunologic reaction. Leukotaxis,Leukocyte Chemotaxis
D000071681 Tartrate-Resistant Acid Phosphatase One of several acid phosphatases in humans, other mammals, plants, and a few prokaryotes. The protein fold of tartrate-resistant acid phosphatase (TRAP) resembles that of the catalytic domain of plant purple acid phosphatase and other serine/threonine-protein phosphatases that also contain a metallophosphoesterase domain. One gene produces the various forms which include purple acid phosphatases from spleen and other tissues. Tartrate-resistant acid phosphatase is a biomarker for pathological states in which it is over-expressed. Such conditions include GAUCHER DISEASE; HODGKIN DISEASE; BONE RESORPTION; and NEOPLASM METASTASIS. AcPase V,Acid Phosphatase V,TRAP Type 5 AcPase,TRAcP,Tartrate-Resistant Acid Phosphatase Type 5,Type 5 Acid Phosphatase,Uteroferrin,Acid Phosphatase, Tartrate-Resistant,Phosphatase V, Acid,Phosphatase, Tartrate-Resistant Acid,Tartrate Resistant Acid Phosphatase,Tartrate Resistant Acid Phosphatase Type 5,V, AcPase,V, Acid Phosphatase

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