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An ultrastructural and immunogold localization study of proteoglycans associated with the osteocytes of fetal bone in osteogenesis imperfecta

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Abstract

Osteogenesis imperfecta (OI) is a rare, heterogeneous, inherited connective tissue disorder frequently caused by abnormalities of type I collagen. It is characterized by bone fragility, osteopenia, and progressive skeletal deformities. Electron microscopy of three OI type II fetal bone samples revealed numerous large osteocyte lacunae. In addition, there was a perilacunar osteoid-like band of collagen surrounding the osteocytes, which was unmineralized and morphologically unusual. Furthermore, large osteocyte lacunae contained fine particles and filamentous material similar to the expected ultrastructural appearance of proteoglycans. More detailed examination was carried out using histochemical and immunogold localization of proteoglycans at light and ultrastructural levels. These tests and the use of electron probe X-ray microanalysis confirmed that the material in the osteocyte lacunae was proteoglycan. In contrast, in the age- and site-matched normal fetal bone, all the osteocyte lacunae appeared negative for proteoglycan. Proteoglycans are regarded as inhibitors of calcification. Our observation of substantial amounts of proteoglycan in abnormally enlarged osteocytic lacunae of some OI fetal bone suggests association with the abnormal bone of this particular subtype of OI type II.

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Authors and Affiliations

  1. Department of Experimental Pathology, Institute of Orthopaedics (University of London), Royal National Orthopaedic Hospital, HA7 4LP, Stanmore, Middlesex, UK

    P. Sarathchandra & S. Yousuf Ali

  2. MRC Connective Tissue Genetics Group, Strangeways Laboratories, Cambridge, UK

    F. Michael Pope

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  1. P. Sarathchandra
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  2. F. Michael Pope
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  3. S. Yousuf Ali
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Sarathchandra, P., Michael Pope, F. & Yousuf Ali, S. An ultrastructural and immunogold localization study of proteoglycans associated with the osteocytes of fetal bone in osteogenesis imperfecta. Calcif Tissue Int 58, 435–442 (1996). https://doi.org/10.1007/BF02509444

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  • DOI: https://doi.org/10.1007/BF02509444

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