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Localization of lanthanum in bone of chronic renal failure rats after oral dosing with lanthanum carbonate.

Abstract：

BACKGROUND:Lanthanum carbonate has been shown to be a safe, effective phosphate-binding agent. We have shown that an impaired mineralization in chronic renal failure rats treated with high doses of lanthanum carbonate develops secondary to phosphate depletion and is therefore pharmacologically mediated rather than a direct effect of lanthanum on bone. Although bulk bone lanthanum concentrations are low, it is important to consider the localization within a given tissue. METHODS:Using the scanning x-ray micro-fluorescence set-up at beamline ID21 of the European Synchrotron Radiation Facility, calcium and lanthanum distributions in bone samples were mapped. RESULTS:In chronic renal failure rats loaded orally with lanthanum carbonate (12 weeks) (2000 mg/kg/day), bulk bone lanthanum concentrations reached values up to 5 microg/g wet weight. Lanthanum could be demonstrated at the edge of the mineralized bone, at both actively mineralizing and quiescent sites, independent of the type of bone turnover. In the presence of hyperparathyroid bone disease, lanthanum was also distributed throughout the mineralized trabecular bone. No correlation with the presence of osteoid, or the underlying bone pathology could be demonstrated. After a 2- or 4-week washout period before sacrifice, lanthanum localization did not change significantly. CONCLUSION:The comparable localization of lanthanum in different types of bone turnover, and the unchanged localization after washout and consequent disappearance of the mineralization defect, indicates no relationship between the localization of lanthanum in bone and the presence of a mineralization defect.

journal_name

Kidney Int

journal_title

Kidney international

authors

Behets GJ,Verberckmoes SC,Oste L,Bervoets AR,Salomé M,Cox AG,Denton J,De Broe ME,D'Haese PC

doi

10.1111/j.1523-1755.2005.00281.x

subject

Has Abstract

pub_date

2005-05-01 00:00:00

pages

1830-6

issue

5

eissn

0085-2538

issn

1523-1755

pii

S0085-2538(15)50661-3

journal_volume

67

pub_type

杂志文章

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