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

Cobra venom, alone and in combination, on mast cell degranulation, histamine release and formation of prostaglandin-like activity (SRS-C) was studied in perfused guinea-pig lungs and in mast cell-containing rat peritoneal cell suspensions. For comparison, the effect of equivalent doses of whole cobra venom was investigated. 1. Cobra venom caused mast cell degranulation, histamine release and SRS-C formation in both systems. For comparable effects much higher doses had to be used in guine-pig lungs than in rat peritoneal cell suspensions. 2. Phase A showed little degranulation of mast cells in both systems, a limited histamine release in rat peritoneal cell suspensions and none in perfused guinea-pig lungs. It caused a considerable SRS-C formation in both, lung tissue and peritoneal cell suspensions. 3. DLF caused histamine release, SRS-C formation and mast cell degranulation in both systems; in rat peritoneal cell suspensions it acted almost as strong as equivalent doses of cobra venom, in guinea pig lungs it was much less active. 4. In rat peritoneal cell suspensions the effects of DLF and phase A in combination did not exceed the sum of their single effects. In guinea-pig lungs these two substances interacted in a potentiating synergism. It is concluded that DLF is the main cytotoxic principle of cobra venom, whereas ph-ase A alone is not cytotoxic. The difference in the synergism of DLF and ph-ase A between rat peritoneal cells and guinea-pig lungs may be due to two different actions of DLF and species differences as regards sensitivity against these actions.
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PMID:Histamine release, formation of prostaglandin-like activity (SRS-C) and mast cell degranulation by the direct lytic factor (DLF) and phospholipase A of cobra venom. 4 54

In the presence of L-cysteine, a selective and marked enhancement of the in vitro, immunologic release of slow reacting substance of anaphylaxis (SRS-A) from human peripheral leukocytes, sensitized monkey lung fragments, and sensitized guinea pig lung fragments was observed. In the rat, cysteine, but not sodium sulfide, enhanced the calcium ionophore (A23187)- induced release of SRS-A in vitro from mixed rat peritoneal cells and in vivo from the rat peritoneal cavity. Pretreatment of rats with cysteine also enhanced the IgGa-and anti-rat IgE-mediated release of SRS-A in vivo in the rat. These studies indicate a common biochemical mechanism involved in the formation and release of SRS-A from these different tissues and cells and further confirm the observation that the rat mast cell is not a major source of SRS-A in the rat.
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PMID:The effect of thiols on the immunologic release of slow reacting substance of anaphylaxis. II. Other in vitro and in vivo models. 5 39

Peripheral blood leukocytes (PBL) and free respiratory cells (RC) of the mast cell-basophil type were obtained from normal rhesus monkeys or rhesus monkeys with defined immediate-type hypersensitivity to ascaris antigen (AA). PBL or RC from the latter were exposed to AA and the former were exposed to anti-IgE. Histamine (H) release and release of a slow reacting substance of anaphylaxis (SRS-A) occurred following exposure of the appropriate cells to AA or anti-IgE. The release of both H and SRS-A from PBL was potentiated by D2O. D2O did not potentiate release of SRS-A or H from RC due to anti-IgE to the same extent. Although potentiation of H release from RC due to AA was observed in the presence of D2O in some individual animals, this could not be demonstrated by statistical analysis of group results. We could not demonstrate potentiation of SRS-A release from RC due to anti-IgE or AA. The results suggest the possibility that there may be differences in antigen reactive cells of the respiratory tree and peripheral blood and biochemical studies may be of use in demonstrating these differences.
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PMID:IgE-mediated histamine and SRS-A release from respiratory cells and peripheral blood leukocytes of rhesus monkeys. 5 54

Human lung mast cells dispersed by enzymatic digestion of human lung fragments were concentrated to greater than 50% purity by sedimentation in isopycnic and velocity gradients. The dispersed lung mast cells had a characteristic ultrasturctural appearance including granules with a scroll or reticular structural appearance including granules with a scroll or reticular structure surrounded by perigranular membranes. Histamine and preformed eosinophilotactic activity sedimented with mast cells on isopycnic gradients, and mast cells and these mediators were separated from the bulk of the other lung cells after velocity gradient sedimentation. The histamine content of isolated lung mast cells was calculated to range from 1.0 to 5.5 pg/cell. The quantity of SRS-A generated with anti-IgE or specific antigen was relatively limited but confined to the mast cell-rich fractions and associated with release of histamine and eosinophilotactic activity.
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PMID:Release of chemical mediators from partially purified human lung mast cells. 6 99

This review demonstrates that basophils reflect skin and lung mast cell reactivity and show characteristic changes in mediator release associated with clinical disease. Although the numbers of IgE molecules and IgE receptors on basophils have been enumerated, these have, in most instances, little influence on the release of histamine after challenge. There is, rather, a parameter of "releasability" that may be a major variable in allergic disease states. Basophils contain and release histamine, the eosinophil chemotactic factor of anaphylaxis (ECFA), a slow reacting substance of anaphylaxis (SRS-A), and a kallikrein. The release process is controlled by hormone-basophil receptor interactions that determine the cyclic AMP level; plasma and tissue adenosine levels appear prominent in this control. Histamine feeds back to negatively modulate basophil and mast cell release through a specific histamine 2-receptor; it also inhibits lymphocyte and neutrophil function. Like neutrophils, basophils contain beta-glucuronidase while neutrophils contain SRS-A and a low-molecular-weight ECF. The stimuli for primary basophil and neutrophil release are, however, quite different, although phagocytic stimuli, which fail to cause basophil mediator release, potentiate the IgE response. It is concluded that basophols play a significant in vivo role in inflammation by acting as an interface between foreign antigens, the serum cascade systems, and other inflammatory cells.
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PMID:The role of basophils in inflammatory reactions. 7 20

Astemizole (0.5-5 mg/kg, p.o.) dose-dependently inhibited heterologous and homologous PCA reactions in rats at ID50 values of 1.48 mg/kg and 2.37 mg/kg, respectively. The inhibitory effect of astemizole on heterologous PCA was most remarkable when this compound was given p.o. 2 h prior to antigen challenge. Astemizole (0.1-5 mg/kg, p.o.) dose-dependently inhibited experimentally-induced asthma in guinea pigs at an ID50 of 0.86 mg/kg. Ex vivo, astemizole (0.5-5 mg/kg, p.o.) inhibited antigen-induced histamine release from lung pieces of sensitized guinea pigs. In in vitro experiments, the drug dose-dependently inhibited antigen-induced histamine and SRS-A releases from guinea pig lung pieces at concentrations of 0.05-10 microM. Furthermore, astemizole (0.1-10 microM) inhibited the histamine release induced by compound 48/80 and antigen-antibody reaction from rat peritoneal mast cells, and at 0.1-500 nM inhibited both leukotriene C4- and platelet-activating factor (PAF)-induced contraction of isolated guinea pig trachea at submicromolar concentrations. Astemizole not only inhibited 45Ca uptake into rat mast cells but also prevented the Ca2+ release from the intracellular Ca store induced by compound 48/80, although this compound did not affect the histamine release from permeabilized mast cells induced by Ca2+. Our results suggest that one of the antiallergic mechanisms of astemizole may be an inhibition of signal transduction from the mast cell membrane to the intracellular systems.
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PMID:Antiallergic effects of astemizole on immediate type hypersensitivity reactions. 170 34

TMV F-IV, isolated from the venom of Trimeresurus mucrosquamatus (TMV), caused rat hind-paw edema in a dose-dependent manner. The maximum hind-paw swelling was reached at 1.5-2 h after subplantar injection of TMV F-IV. The edematous response caused by TMV F-IV was suppressed by the s.c. pretreatment with diphenhydramine, methysergide, acetylsalicylic acid or dexamethasone, and by the subplantar co-injection with FPL 55712, a SRS-A antagonist, and BN 52021 or L 652731, both PAF antagonists. Polymorphonuclear (PMN) leukocyte infiltration appeared within 1 h and gradually increased in the rat paw 3-6 h after edema induction. Compound 48/80 or methotrexate pretreatment also inhibited paw edema caused by TMV F-IV. In isolated mast cells, TMV F-IV increased the formation of PGE2 and LTB4 and caused a dose-dependent release of histamine and beta-glucuronidase. Since there are no significant differences in paw edema and mast cell degranulation responses between TMV F-IV and its DFP-modified analogue, the esterase activity may not be necessary in these models. These results indicate that mast cells. PMN leukocytes and some inflammatory mediators such as histamine, serotonin, arachidonate metabolites and PAF are involved in TMV F-IV induced paw edema.
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PMID:Rat hind-paw swelling effect of an edema-producing protein isolated from Trimeresurus mucrosquamatus snake venom. 171 14

Water-soluble constituents of Ginkgo biloba episperm 100 or 200 mg/kg po given to mice inhibited passive cutaneous allergic response and the same dose given to rats ip inhibited mast cell degranulation. It antagonized the contractile effect of isolated guinea pig ileum smooth muscles induced by the antigen. It inhibited the deliverance of SRS-A from anaphylactic lung of guinea pig.
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PMID:[Anti-anaphylactic pharmacological action of water-soluble constituents of Ginkgo biloba L. episperm]. 209 26

The distinct features of the eosinophil include their content of large crystalloid granules which contain a number of unique basic proteins, and their capacity to selectively generate the SRS-A, sulphidopeptide leukotrienes. Eosinophil-derived products probably play an important role in the destruction of helminthic larvae but in some situations, for instance, chronic bronchial asthma and the hypereosinophilic syndrome, the cell might be responsible for considerable tissue damage. Eosinophils can be activated, in vitro, by a variety of agents which include factors associated with eosinophil maturation, mast cell products and other substances released during allergic tissue reactions and other inflammatory processes. At the present time there is growing interest in the fact that in many conditions associated with eosinophilia there is a population of light density "activated" cells which, in a variety of biological systems, respond more vigorously than normal ("normodense") eosinophils. Knowledge of eosinophils and eosinophil-associated events is growing rapidly and there is a need to modify continuously our views on the precise role(s) of the eosinophil in the light of these new findings.
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PMID:Eosinophils: role in asthma, allergy and parasite immunity. 387 May 2

The polymorphonuclear leukocyte appears to be an essential cellular prerequisite for the antigen-induced release of SRS-A(rat) in the peritoneal cavity of rats prepared with homologous, hyperimmune antisera. Depletion of PMN leukocytes is associated with a marked suppression of SRS-A(rat) release, whereas depletion of circulating lymphocytes or peritoneal mast cells does not influence the antigen-induced release of SRS-A(rat). A local increase in the number of PMN leukocytes produced by the induction of a peritoneal exudate was associated with an enhanced release of SRS-A(rat). A distinct difference in the cellular requirements for the antigen-induced release of histamine and SRS-A(rat) in the rat was observed. Homocytotropic antibody-mediated histamine release could be achieved in leukopenic rats but not in mast cell-depleted animals. Conversely, SRS-A(rat) release was suppressed in leukopenic rats but was unaffected by mast cell depletion. Diethylcarbamazine inhibited the antigen-induced release of SRS-A(rat) following preparation with homologous, hyperimmune antisera but did not interfere with homocytotropic antibody-mediated histamine release. In preventing SRS-A(rat) release, diethylcarbamazine did not interfere with antigen-antibody interaction since desensitization of tissues was possible in the presence of this inhibitor. This observation is consistent with the view that diethylcarbamazine inhibits the reaction sequence leading to the formation and release of SRS-A(rat) at some step subsequent to antigen-antibody interaction. These studies support the view that the immunologic pathways leading to the release of SRS-A(rat) and histamine in the rat are distinctly different in terms of the immunoglobulins involved, the cellular prerequisites, and the effective pharmacologic inhibitors.
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PMID:Antigen-induced release of slow reacting substance of anaphylaxis (SRS-A rat) in rats prepared with homologous antibody. 438 30


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