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Updated: Jun 26, 2026
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A Novel in vivo Gene Transfer Technique and in vitro Cell Based Assays for the Study of Bone Loss in Musculoskeletal Disorders
Published on: June 8, 2014
Collectin-11 regulates osteoclastogenesis and bone maintenance via a complement-dependent mechanism.
Mark C Howard1, Conrad A Farrar1, Christopher L Nauser1
1Medical Research Council Centre for Transplantation, Peter Gorer Department of Immunobiology, School of Immunology & Microbial Sciences, King's College London, London SE1 9RT, United Kingdom.
Summary
Collectin-11 (CL-11) deficiency alone doesn't cause bone issues, but combined with complement system defects, it leads to bone loss and spinal deformities. CL-11 is crucial for osteoclast function and bone homeostasis.
Area of Science:
- Immunology
- Developmental Biology
- Skeletal Biology
Background:
- 3MC syndrome involves skeletal deformities linked to collectin-11 (CL-11) deficiency.
- The precise molecular mechanisms underlying CL-11's role in skeletal development are unclear.
Purpose of the Study:
- To investigate the role of CL-11 in skeletal homeostasis.
- To elucidate the interplay between CL-11 and the complement system in bone remodeling.
Main Methods:
- Generated and analyzed CL-11 deficient mice, including double knockouts with complement pathway components.
- Performed ex vivo osteoclast differentiation assays using murine and human cell lines.
- Utilized immunofluorescence to examine CL-11 and membrane attack complex (C5b-9) localization in bone.
Main Results:
- CL-11 deficiency alone did not cause skeletal abnormalities in mice.
- Combined CL-11 and complement component deficiencies (MASP-2, Factor B, or C3) resulted in significant vertebral bone loss and spinal curvature.
- Osteoclast differentiation was impaired in double knockout mice but restored with CL-11 supplementation.
- CL-11 and C5b-9 colocalized to osteoclasts and their precursors in normal bone.
Conclusions:
- Collectin-11 is essential for osteoclastogenesis and maintaining bone homeostasis.
- CL-11 acts in conjunction with complement-mediated signaling pathways.
- CL-11 represents a potential therapeutic target for bone remodeling disorders.
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