Determination of chitinases family during osteoclastogenesis.
Mammalian chitinases consisting of CHIA, CHIT1, CHI3L1, CHI3L2 and CHID1 exert important biological roles in the monocyte lineage and chronic inflammatory diseases. Pathological bone resorption is a cause of significant morbidity in diseases affecting the skeleton such as rheumatoid arthritis, osteoporosis, periodontitis and cancer metastasis. The biologic role of chitinases in bone resorption is poorly understood. In this study, we evaluated the expression of the chitinases family during osteoclast differentiation. The expression of CHIA, CHI3L2 and CHID1 resulted unchanged during osteoclast differentiation, whereas CHIT1 and CHI3L1 increased significantly. We also observed that CHIT1 and CHI3L1 are involved in osteoclast function. Indeed, silencing CHIT1 and CHI3L1 with siRNA resulted in a significant decrease in bone resorption activity. In addition, transfection with CHIT1 or CHI3L1 siRNA and co-transfection with both decreased the levels of the pro-differentiative marker MMP9. Overall, these discoveries reveal a novel and crucial role for both CHIT1 and CHI3L1 in promoting bone resorption and identifying new potential candidate markers for therapeutic targeting.
Department of Bio-medical Sciences, University of Catania, Italy. Electronic address: chitotriosidase@gmail.com.
Michelino
M
Di Rosa
Department of Clinical and Molecular Biomedicine, University of Catania, Ospedale Ferrarotto, Italy.
Daniele
D
Tibullo
Physical Medicine and Rehabilitation Unit, University of Catania, Hospital Policlinic Vittorio Emanuele, Catania, Italy.
Michele
M
Vecchio
Department of Clinical and Molecular Biomedicine, Division of Infectious Diseases, University of Catania, Italy.
Giuseppe
G
Nunnari
Department of Biological, Geological and Environmental Sciences, University of Catania, Italy.
Salvatore
S
Saccone
Department of Clinical and Molecular Biomedicine, University of Catania, Ospedale Ferrarotto, Italy.
Francesco
F
Di Raimondo
Department of Bio-medical Sciences, University of Catania, Italy.
Lucia
L
Malaguarnera
D054392:Adipokines / Q000378:metabolism*; D015153:Blotting, Western; D001862:Bone Resorption / Q000201:enzymology*; D002454:Cell Differentiation / Q000502:physiology; D002478:Cells, Cultured; D000071451:Chitinase-3-Like Protein 1; D002688:Chitinases / Q000378:metabolism; D005455:Fluorescent Antibody Technique; D006596:Hexosaminidases / Q000378:metabolism*; D006801:Humans; D037102:Lectins / Q000378:metabolism*; D009000:Monocytes / Q000166:cytology / Q000201:enzymology; D010010:Osteoclasts / Q000166:cytology / Q000201:enzymology*; D034741:RNA, Small Interfering; D060888:Real-Time Polymerase Chain Reaction; D014162:Transfection
D054392:Adipokines; C084533:CHI3L1 protein, human; D000071451:Chitinase-3-Like Protein 1; D037102:Lectins; D034741:RNA, Small Interfering; D006596:Hexosaminidases; C086400:chitotriosidase; D002688:Chitinases
Chitinase-like-proteins (CLPs); Chitinases; Osteoclasts; Osteolysis