Abstract
Patients with chronic liver diseases frequently exhibit decreased bone mineral densities (BMD), which is defined as hepatic osteodystrophy (HOD). HOD is a multifactorial disease whose regulatory mechanisms are barely understood. Thus, an early diagnosis and therapy is hardly possible. Therefore, the aim of our study consisted in characterizing a mouse model reflecting the human pathomechanism. Serum samples were collected from patients with chronic liver diseases and 12-week old C57Bl6/N mice after 6-week treatment with carbon tetrachloride (CCl4). Repetitive injections of CCl4 induced liver damage in mice, resembling liver fibrosis in patients, as assessed by serum analysis and histological staining. Although CCl4 did not affect primary osteoblast cultures, μCT analysis revealed significantly decreased BMD, bone volume, trabecular number and thickness in CCl4-treated mice. In both HOD patients and CCl4-treated mice, an altered vitamin D metabolism with decreased CYP27A1, CYP2R1, vitamin D-binding protein GC and increased 7-dehydrocholesterol reductase hepatic gene expression, results in decreased 25-OH vitamin D serum levels. Moreover, both groups exhibit excessively high active transforming growth factor-beta (TGF-β) serum levels, inhibiting osteoblast function in vitro. Summarizing, our mouse model presents possible mediators of HOD, e.g. altered vitamin D metabolism and increased active TGF-β. Liver damage and significant changes in bone structure and mineralization are already visible by μCT analysis after 6 weeks of CCl4 treatment. This fast response and easy transferability makes it an ideal model to investigate specific gene functions in HOD.
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Abbreviations
- BMD:
-
Bone mineral density
- CYP2R1:
-
Cytochrome P450 2R1
- CYP27A1:
-
Cytochrome P450 27A1
- DHCR7:
-
7-Dehydrocholesterol reductase
- GC:
-
Vitamin D-binding protein
- HOD:
-
Hepatic osteodystrophy
- IGF-1:
-
Insulin-like growth factor
- OPG:
-
Osteoprotegerin
- RANKL:
-
Receptor activator of NF-κB ligand
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The work was partially supported by funding of the BG trauma clinic and by the Federal Ministry of Education and Research (BMBF—0315741—Virtual Liver).
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204_2013_1191_MOESM1_ESM.tif
Supplementary Figure: CCl4 treatment damages hepatocytes but not osteoblasts. (a) Primary human hepatocytes (N = 5, n ≥ 4) and primary human osteoblasts (N = 6, n = 4) were stimulated repeatedly (4 times) with 0, 1, 2 and 10 mM CCl4. After 96 h cell viability was determined by resazurin conversion. Reduced cell viability was observed only in hepatocytes but not in osteoblasts. (b) The CCl4 treated osteoblasts were further analysed for AP activity and matrix mineralization as functional characteristics. CCl4 treatment did not alter AP activity and matrix mineralization in osteoblasts. * p < 0.05, *** p < 0.001 as compared to untreated controls. (TIFF 1052 kb)
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Nussler, A.K., Wildemann, B., Freude, T. et al. Chronic CCl4 intoxication causes liver and bone damage similar to the human pathology of hepatic osteodystrophy: a mouse model to analyse the liver–bone axis. Arch Toxicol 88, 997–1006 (2014). https://doi.org/10.1007/s00204-013-1191-5
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DOI: https://doi.org/10.1007/s00204-013-1191-5