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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Characterization of the non-collagenous proteins in avian cortical and medullary bone.

Northern blotting, RT-PCR, and Western blotting techniques were used to characterize the matrix constituents of avian cortical and medullary bone. Extracts of bone tissue were found to contain multiple isoforms of bone sialoprotein ( BSP), osteopontin (OPN), osteonectin (ON), osteocalcin (OC), and dentin matrix protein-1 (DMP-1). Only single transcripts were observed with Northern blotting; therefore it was concluded that the isoforms were due to differences in post-translational modifications. Since medullary bone is rich in keratan sulfate (KS), RT-PCR was used to investigate the expression of known keratan sulfate-containing proteoglycans (KSPGs). Although this tissue was found to express lumican and osteoglycin/mimecan, there was little evidence to suggest that these proteoglycans were a major source of the keratan sulfate glycosaminoglycans. Treatment of medullary bone extracts with keratanase resulted in the appearance of a BSP immunoactive band of approximately 59 kDa. However, it was not possible to isolate and identify the intact keratan sulfate proteoglycan.[1]

References

  1. Characterization of the non-collagenous proteins in avian cortical and medullary bone. Wang, X., Ford, B.C., Praul, C.A., Leach, R.M. Comp. Biochem. Physiol. B, Biochem. Mol. Biol. (2005) [Pubmed]
 
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