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Query: UNIPROT:P15088 (mast cell)
 14,925 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Inhibitors of mast cell tryptase and chymase can be effective as mast cell stabilising compounds. Lactoferrin has been reported to inhibit tryptase activity, but its actions on other serine proteases of mast cells and its potential to alter mast cell function are not known. We have examined the ability of lactoferrin to inhibit mast cell tryptase, chymase and cathepsin G, and investigated its potential to modulate the activation of human mast cells. Enzymatically dispersed cells from human skin, lung and tonsil were challenged with anti-IgE or calcium ionophore A23187, following incubation with recombinant human lactoferrin, and histamine release determined. IgE-dependent histamine release from skin mast cells was inhibited by up to 50% following incubation with lactoferrin (50 or 500 nM). Tonsil mast cells were also stabilised by lactoferrin, but not those from lung. Calcium ionophore A23187-induced histamine release was not altered by lactoferrin. A double-labelling immunocytochemical procedure revealed the presence of lactoferrin in 4-6% of mast cells, and this proportion increased to 40% following incubation with lactoferrin. Lactoferrin did not inhibit cleavage of synthetic substrates by tryptase and chymase directly, though it was able to diminish the ability of heparin to stabilise tryptase. Cathepsin G activity was inhibited by lactoferrin. The ability of lactoferrin to inhibit IgE-dependent activation of human mast cells and modulate protease activity suggests that the release of this neutrophil product may have a role in the downregulation of allergic inflammation.
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PMID:The inhibition of mast cell activation by neutrophil lactoferrin: uptake by mast cells and interaction with tryptase, chymase and cathepsin G. 1262 33

Mast cell take active part in immune system of body, clinical manifestations are closely related to hypersensitivity. Reactions and potent biological mediators released by these cells are responsible for different clinical manifestation like allergic reaction. Frequent and important sites of these allergic reactions occur in-upper aero digestive tract, nasal, pharyngeal and respiratory allergies. The study aims to demonstrate different types of heparin in mast cells having role in tonsillitis. Present work is to study distribution and histochemical nature of mast cells in human palatine tonsil in patients suffering from chronic tonsillitis. 20 cases were studied during the study. Diagnosis was done on clinical criteria-Anterior pillar flushing. Expulsion of cheesy material from the tonsillar crypts on pressing with tongue depressor. Palpable jugulodigastric group of lymph nodes. Dissected Tonsillar material fixed into fixative-staining done. For qualitative histological observation Harris Haemotoxylene with eosin used as counter stain. Normal Histological study of mast cell like size, shape, granules were done. Distribution of mast cells in different parts of Tonsillar Tissue was observed. Histochemical study of mast cells to determine nature of reactive substance was done. Tonsil contains mucous glands, no granular tissue in present study of chronic inflammatory reactions feasible in form of fibrosis, lymphatic infiltration in epithelium. Morphology of mast cells with toluidine blue at pH 2 and 4.4 gave better picture. Mast cells had varied shape and size in different places and points of same field of focus, oval, elongated, fusiform, pleomorphic in shape. Nucleus is central ill-defined masked by granules. Cytoplasm contains mast cell granules that stained blue with Alcian blue stain, purple to bluish purple with toluidine blue. Distribution of mast cells in present study: Mast cells were found at all places mostly concentrated at capsules. Lamina propria-1-2/hpf, capsule-4-5/hpf, connective tissue septa-1-2/hpf. Histochemical Feature- In present study, histochemical study remained confined to connective tissue septa of mast cells and biochemical nature of Heparin contained in it. In present work, the identification of mast cells is based on metachromatic reactions of its granules with acidified toluidine blue at pH 2 and buffered toluidine blue at pH 4.4 to identify mast cell granules containing higher and lower sulphates of heparin.
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PMID:Histological and Histochemical Observations on Mast Cell and Glands in Chronic Tonsillitis. 3174 25