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Effects of fixation and decalcification on the immunohistochemical localization of bone matrix proteins in fresh-frozen bone sections

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Abstract

To examine the stability of bone matrix proteins for crystal dislocation, the immunolocalization of type I collagen, bone sialoprotein, and osteopontin was investigated during different stages of fixation and decalcification. Four-week-old rat femurs were rapidly frozen, and were sectioned without fixation or decalcification. Thereafter, following or bypassing fixation in 4% paraformaldehyde, these sections were decalcified in 5% EDTA for 0-5 min. Before decalcification, marked radiopacity of bone matrix was observed in contact microradiography (CMR) images, and electron probe microanalysis (EPMA) demonstrated intense localization for phosphorus and calcium. In fixed and unfixed sections without decalcification, immunolocalization of bone matrix proteins were almost restricted to osteoid. After 1 min of decalcification, reduced radiopacity was apparent in the CMR images, and less phosphorus and calcium was observed by EPMA, which completely disappeared by 5 min decalcification. After 3-5 min of decalcification, unfixed sections showed that these proteins were immunolocalized in bone matrix, but were not detectable in osteoid. However, fixed sections demonstrated that these were found in both bone matrix and osteoid. The present findings suggest that bone matrix proteins are embedded in calcified matrix which is separated from the aqueous environment and that they hardly move, probably due to firm bonding with each other. In contrast, matrix proteins in osteoid are subject to loss after decalcification because they may be bound to scattered apatite crystals, not to each other.

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Acknowledgements

The authors would like to thank Dr. L.W. Fisher (National Institute of Dental Research, National Institute of Health) and Dr. M. Fukae (Department of Biochemistry, Tsurumi University School of Dental Medicine) for kindly providing the antibodies against BSP and OPN. This work was supported, in part, by Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan.

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Correspondence to Akihiro Hosoya.

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Hosoya, A., Hoshi, K., Sahara, N. et al. Effects of fixation and decalcification on the immunohistochemical localization of bone matrix proteins in fresh-frozen bone sections. Histochem Cell Biol 123, 639–646 (2005). https://doi.org/10.1007/s00418-005-0791-4

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