title: Increased Bone Mass in Female Mice Lacking Mast Cell Chymase.
abstract: Here we addressed the potential impact of chymase, a mast-cell restricted protease, on mouse bone phenotype. We show that female mice lacking the chymase Mcpt4 acquired a persistent expansion of diaphyseal bone in comparison with wild type controls, reaching a 15% larger diaphyseal cross sectional area at 12 months of age. Mcpt4-/- mice also showed increased levels of a bone anabolic serum marker and higher periosteal bone formation rate. However, they were not protected from experimental osteoporosis, suggesting that chymase regulates normal bone homeostasis rather than the course of osteoporosis. Further, the absence of Mcpt4 resulted in age-dependent upregulation of numerous genes important for bone formation but no effects on osteoclast activity. In spite of the latter, Mcpt4-/- bones had increased cortical porosity and reduced endocortical mineralization. Mast cells were found periosteally and, notably, bone-proximal mast cells in Mcpt4-/- mice were degranulated to a larger extent than in wild type mice. Hence, chymase regulates degranulation of bone mast cells, which could affect the release of mast cell-derived factors influencing bone remodelling. Together, these findings reveal a functional impact of mast cell chymase on bone. Further studies exploring the possibility of using chymase inhibitors as a strategy to increase bone volume may be warranted.
authors.affiliation: Uppsala University Hospital, Department of Medical Sciences, Section of Clinical Pharmacology, Uppsala, Sweden.
authors.forename: Thomas
authors.initials: T
authors.lastname: Lind
authors.affiliation: Uppsala University Hospital, Department of Medical Sciences, Section of Clinical Pharmacology, Uppsala, Sweden.|Uppsala University, Department of Medical Biochemistry and Microbiology, Uppsala, Sweden.
authors.forename: Ann-Marie
authors.initials: AM
authors.lastname: Gustafson
authors.affiliation: Uppsala University, Department of Medical Biochemistry and Microbiology, Uppsala, Sweden.
authors.forename: Gabriela
authors.initials: G
authors.lastname: Calounova
authors.affiliation: Uppsala University Hospital, Department of Medical Sciences, Section of Clinical Pharmacology, Uppsala, Sweden.
authors.forename: Lijuan
authors.initials: L
authors.lastname: Hu
authors.affiliation: Uppsala University Hospital, Department of Medical Sciences, Section of Clinical Pharmacology, Uppsala, Sweden.
authors.forename: Annica
authors.initials: A
authors.lastname: Rasmusson
authors.affiliation: Uppsala University Hospital, Department of Surgical Sciences, Uppsala, Sweden.
authors.forename: Kenneth B
authors.initials: KB
authors.lastname: Jonsson
authors.affiliation: Swedish University of Agricultural Sciences, Department of Anatomy, Physiology and Biochemistry, Uppsala, Sweden.
authors.forename: Sara
authors.initials: S
authors.lastname: Wernersson
authors.affiliation: Swedish University of Agricultural Sciences, Department of Biomedical Science and Veterinary Public Health, Uppsala, Sweden.
authors.forename: Magnus
authors.initials: M
authors.lastname: Åbrink
authors.affiliation: Karolinska Institute, Division of Pathology, Department of Laboratory Medicine, Karolinska University Hospital Huddinge, Stockholm, Sweden.
authors.forename: Göran
authors.initials: G
authors.lastname: Andersson
authors.affiliation: Uppsala University Hospital, Department of Surgical Sciences, Uppsala, Sweden.
authors.forename: Sune
authors.initials: S
authors.lastname: Larsson
authors.affiliation: Uppsala University Hospital, Department of Medical Sciences, Section of Clinical Pharmacology, Uppsala, Sweden.
authors.forename: Håkan
authors.initials: H
authors.lastname: Melhus
authors.affiliation: Uppsala University, Department of Medical Biochemistry and Microbiology, Uppsala, Sweden.|Swedish University of Agricultural Sciences, Department of Anatomy, Physiology and Biochemistry, Uppsala, Sweden.
authors.forename: Gunnar
authors.initials: G
authors.lastname: Pejler
mesh_terms: D000818:Animals; D015519:Bone Density / Q000235:genetics*; D053818:Chymases / Q000235:genetics / Q000378:metabolism*; D005260:Female; D008407:Mast Cells / Q000201:enzymology*; D051379:Mice; D018345:Mice, Knockout; D010024:Osteoporosis / Q000209:etiology / Q000235:genetics / Q000517:prevention & control; D010052:Ovariectomy; D014801:Vitamin A / Q000008:administration & dosage
chemical_list: D014801:Vitamin A; D053818:Chymases