Deletion of the membrane complement inhibitor CD59a drives age and gender-dependent alterations to bone phenotype in mice

Abstract Degenerative joint diseases such as osteoarthritis are characterised by aberrant region-specific bone formation and abnormal bone mineral content. A recent study suggested a role for the complement membrane attack complex in experimental models of osteoarthritis. Since CD59a is the principa...

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Published in:	Bone (New York, N.Y.) N.Y.), 2016-03, Vol.84, p.253-261
Main Authors:	Bloom, Anja C, Collins, Fraser L, van't Hof, Rob J, Ryan, Elizabeth S, Jones, Emma, Hughes, Timothy R, Morgan, B. Paul, Erlandsson, Malin, Bokarewa, Maria, Aeschlimann, Daniel, Evans, Bronwen A.J, Williams, Anwen S
Format:	Article
Language:	eng
Subjects:	1965 1986 activation Ageing Aging - pathology Animals Bone Bone and Bones - pathology Bone Development Bone Marrow Cells - pathology Bone Remodeling CD59 Antigens - metabolism CD59a cells Clinical Medicine Complement System Proteins - metabolism deficiency differentiation disease severity Endocrinology & Metabolism expression Female Gene Deletion in-vivo journal of immunological methods journal of organic chemistry Klinisk medicin Male Mice, Inbred C57BL Micro-CT molecular-mechanisms naka s opard pa Organ Size Original Full Length Orthopedics Osteoblasts - metabolism Osteoblasts - pathology Osteoclast osteoclast formation Osteoclasts - metabolism Osteoclasts - pathology p1015 p161 Phenotype rheumatoid-arthritis Sex Characteristics v30 v86
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Summary:	Abstract Degenerative joint diseases such as osteoarthritis are characterised by aberrant region-specific bone formation and abnormal bone mineral content. A recent study suggested a role for the complement membrane attack complex in experimental models of osteoarthritis. Since CD59a is the principal regulator of the membrane attack complex in mice, we evaluated the impact of CD59a gene deletion upon maintenance of bone architecture. In vivo bone morphology analysis revealed that male CD59a-deficient mice have increased femur length and cortical bone volume, albeit with reduced bone mineral density. However, this phenomenon was not observed in female mice. Histomorphometric analysis of the trabecular bone showed increased rates of bone homeostasis, with both increased bone resorption and mineral apposition rate in CD59a-deficient male mice. When bone cells were studied in isolation, in vitro osteoclastogenesis was significantly increased in male CD59a-deficient mice, although osteoblast formation was not altered. Our data reveal, for the first time, that CD59a is a regulator of bone growth and homeostasis. CD59a ablation in male mice results in longer and wider bones, but with less density, which is likely a major contributing factor for their susceptibility to osteoarthritis. These findings increase our understanding of the role of complement regulation in degenerative arthritis.
ISSN:	8756-3282 1873-2763