Summary
Mucosal mast cells in the rat duodenum show no morphological signs of exocytosis of granules and do not release histamine after treatment with polymyxin B in doses large enough to cause almost complete degranulation of connective-tissue mast cells of tongue, skin, and mesentery with concomitant release of ∼ 60% of the tissue histamine. Administration of polymyxin B in gradually increasing doses over a period of 5ds resulted in a statistically significant increase in mucosal mast cells and a comparable increase in duodenal histamine content, whereas the connective-tissue mast cells in the other tissues examined became fewer in number, the remaining cells showing profound morphological changes, and tissue histamine levels, were reduced to ∼ 40% of the controls. A similar increase in mucosal mast cells has been observed after treatment with another mast-cell secretagogue, compound 48/80. This suggests that the increase in mucosal mast cells may be an indirect effect of these compounds, related to their activation of other mast cells and mediated by material(s) secreted by the connective-tissue mast cells. Possible mediators such as heparin, histamine, and 5-hydroxytryptamine injected for 5 ds in doses large enough to account for the amount released from the degranulated mast cells had no effect on the morphology or numbers of mast cells in any of the tissues examined.
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Supported by grants from the Swedish Medical Research Council, Project no 2235
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Enerbäck, L., Löwhagen, G., Löwhagen, O. et al. The effect of polymyxin B and some mast-cell constituents on mucosal mast cells in the duodenum of the rat. Cell Tissue Res. 214, 239–246 (1981). https://doi.org/10.1007/BF00249208
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DOI: https://doi.org/10.1007/BF00249208