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- W172946609 abstract "The distribution and enumeration of mast cell subpopulations within the respiratory tract of a high- and low-Ige responder rat strain was determined during postnatal development. Mast cells were identified in adjacent sections by the alcian blue (AB)/safranin (SAF) staining sequence, or using immunoperoxidase to detect the rat mast cell proteinases I (RMCPI) or II (RMCPII). At birth both mucosal mast cells (MMC) and connective tissue mast cells (CTMC) were represented in very low numbers at distinct locations throughout the respiratory tract. The total number of mast cells increased with age. MMC (AB+/RMCPII+ mast cells) were the predominant phenotype in the epithelium and lamina propria of the trachea and the major conducting airways of the lung in all age groups. In contrast, CTMC (AB+/RPMCPI+ and SAF+/RMCPI+ mast cells) predominated in the submucosa of the trachea and major conducting airways as well as in the parenchyma and visceral pleura of the peripheral lung. Both phenotypes co-exist in similar proportions in peribronchial adventitial tissue and adventitia surrounding large blood vessels in neonates as well as adults. In rats the tracheal epithelium is densely populated by MMC from around the time of weaning (3 weeks) and a small but generalized increase in the number of MMC at all sites within the respiratory tract is noted from this time. This increase in MMC frequency in tissue sections with increasing age is mirrored by the levels of circulating serum RMCPII. The number of bone marrow-derived MMC also increased with increasing age prior to weaning, with a significant drop (P less than 0.01) at 4 weeks of age before returning to the peak numbers in 3-week-old rats. The high-IgE responder Brown Norwegian (BN) rat strain constitutively produces significantly more IgE than the low-IgE responder White albino Glaxo (WAG) strain (P less than 0.001) at all ages studied. In contrast, only minor differences between the number and distribution of mast cells in the two strains were observed." @default.
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- W172946609 title "Postnatal maturation of mast cell subpopulations in the rat respiratory tract." @default.
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