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Distribution, Histochemical and Enzyme Histochemical Characterization of Mast Cells in Dogs

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Abstract

This study describes the distribution, proteoglycan properties and protease activity of mast cells from 15 different dog organs. In beagles and mixed breed dogs, staining with Alcian Blue–Safranin O revealed mast cells in all the organs examined. However, their numbers varied and they demonstrated unique localization patterns within some of these organs. Berberine sulphate fluorescence-positive mast cells were observed in the submucosa, muscularis and serosa of the intestines, as well as the tongue and liver (within the connective tissue). Mast cells within the intestinal mucosa were negative for, or demonstrated weak, berberine sulphate staining. Heterogeneity of mast cells in terms of the proteoglycans contained within their granules was further confirmed by determination of critical electrolyte concentrations (CECs). The CECs of mast cells within the connective tissue of several organs, including the intestines (submucosal and muscularis–serosal layers) were all greater than 1.0 M. The results from CEC experiments together with berberine staining indicate that heparin was contained within their granules. Relative to the CECs of mast cells in other organs, mast cells in the intestinal mucosa exhibited lower CECs, suggesting that the proteoglycans within their granules were of lower charge density and/or molecular weight. Although mast cells were classified into two groups by proteoglycans within the granules, enzyme histochemical analysis in beagles revealed three subtypes of mast cells: chymase (MCC), tryptase (MCT) and dual positive (MCTC) cells. There was no correlation between the proteoglycan content and enzyme properties of the mast cell granules.

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Noviana, D., Mamba, K., Makimura, S. et al. Distribution, Histochemical and Enzyme Histochemical Characterization of Mast Cells in Dogs. Histochem J 35, 123–132 (2004). https://doi.org/10.1023/B:HIJO.0000023377.70443.08

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  • DOI: https://doi.org/10.1023/B:HIJO.0000023377.70443.08

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