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Advanced Glycation End Product Modification of Bone Proteins and Bone Remodelling: Hypothesis and Preliminary Immunohistochemical Findings

Overview
Journal Ann Rheum Dis
Specialty Rheumatology
Date 2005 Dec 14
PMID 16344492
Citations 37
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Abstract

Background: The process of bone remodelling is disturbed in the development of osteoporosis.

Objective: To investigate if proteins in osteoporotic bone are modified by advanced glycation end products (AGEs), and whether these alterations are related to measures of bone remodelling based on histomorphometric findings.

Methods: Bone specimens taken from the iliac crest by bone biopsy of eight osteoporotic patients were investigated by histomorphometry and by immunohistochemical staining with the AGEs imidazolone and N(epsilon)-carboxymethyllysine.

Results: Both AGEs were found in all bone specimens. The intensity of staining correlated with patient age. The percentage of bone surface covered with osteoblasts showed a significantly negative correlation with the staining intensity of both AGEs.

Conclusions: It is known that AGEs can regulate proliferation and differentiation of osteoblastic cells and that AGE-specific binding sites are present in cultured osteoblast-like cells. Moreover, AGE induced biological effects in these cells might be mediated by RAGE (receptor of AGE) or by other AGE receptors in different stages of osteoblast development. The inverse relation between AGE staining intensity and the percentage of bone surface covered with osteoblasts in the trabecular bone may provide evidence that AGE modification of bone proteins disturbs bone remodelling.

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