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Characterization of dystrophic calcification induced in mice by cardiotoxin
Yongdong Zhao1, Annette L Urganus, Lyudmila Spevak
1Center of Excellence in Clinical Immunology, Children's Memorial Research Center, 2300 Children's Plaza, Box 212, Chicago, IL 60614, USA. yongdong.zhao@cchmc.org
Abstract:
Dystrophic calcifications often occur after injury, infection, or onset of certain rheumatic diseases. Treatment has been limited to surgical removal following failure of medical therapy. In an attempt to establish a reproducible animal model for dystrophic calcification that permitted the screening of potential interventions, we evaluated cardiotoxin (injury)-induced calcifications in three murine strains at both the cellular and ultrastructural levels. All osteopontin null mice and tumor necrosis factor receptor null mice on a C57B6 background had calcifications at days 3 and 7 after injury compared to 75% of wild-type C57B6 mice. There was no difference in mineral content among calcifications from the three mouse strains. Osteogenesis was suggested by the expression of osteocalcin, osterix, and alkaline phosphatase in calcified murine muscle tissue. Osteoclast-like cells facilitated the removal of transient dystrophic deposits (<28 days) in all models. However, none of the models showed an association of mineral crystals with collagen, suggesting that the deposits were not bone-like. The dystrophic mechanism was validated as cell death, and mitochondrial calcifications occurred soon after skeletal muscle injury in the three murine strains.
Insights
Researchers developed a new animal model for dystrophic calcification using cardiotoxin-induced injury in mice. This model helps study calcification mechanisms and potential treatments for conditions like rheumatic diseases.
Area of Science:
- Biomedical research
- Pathology
- Musculoskeletal system
Background:
- Dystrophic calcifications commonly arise after injury, infection, or rheumatic diseases.
- Current treatments primarily involve surgical removal after medical therapy failure.
- A reproducible animal model is needed to screen potential interventions.
Purpose of the Study:
- To establish a reproducible murine model for cardiotoxin-induced dystrophic calcification.
- To investigate the cellular and ultrastructural characteristics of this calcification model.
- To evaluate the role of osteopontin and tumor necrosis factor receptor in dystrophic calcification.
Main Methods:
- Induction of dystrophic calcification using cardiotoxin in three murine strains.
- Cellular and ultrastructural analysis of calcified tissues.
- Assessment of gene expression related to osteogenesis (osteocalcin, osterix, alkaline phosphatase).
- Evaluation of osteoclast-like cell activity and mineral crystal association with collagen.
Main Results:
- Osteopontin null and tumor necrosis factor receptor null mice exhibited higher calcification rates post-injury compared to wild-type C57B6 mice.
- No significant differences in mineral content were observed among the strains.
- Evidence of osteogenesis was suggested by specific gene expression.
- Osteoclast-like cells mediated the clearance of transient deposits.
- Deposits lacked collagen association, indicating a non-bone-like structure.
- Cell death and mitochondrial calcifications were identified as early mechanisms.
Conclusions:
- Cardiotoxin-induced injury in mice provides a reproducible model for studying dystrophic calcification.
- Osteopontin and TNF receptor signaling may influence the development of dystrophic calcification.
- The model validates cell death and mitochondrial calcification as early events.
- This model facilitates the screening of therapeutic interventions for dystrophic calcification.
