Linked Life Data

6202691

Source:http://linkedlifedata.com/resource/pubmed/id/6202691

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pubmed-article:6202691pubmed:abstractTextRat basophil leukemic (2H3) cells ( Siraganian , R.P., McGivney , A., Barsumian , E. L., Crews, F. T., Hirata , F., and Axelrod , J. (1982) Fed. Proc. 41, 30-34) loaded with fluorescent Ca2+ indicator quin 2 ( Tsien , R. Y. (1980) Biochemistry 19, 2396-2404) showed a rapid increase in free cytosol calcium concentration [( Ca]i) when histamine release was induced. Intracellular quin 2 concentrations up to 7 mM did not affect release of histamine in response to antigen (aggregated ovalbumin) or concanavalin A with cells primed with antigen-specific monoclonal IgE, or in response to Ca2+ ionophores. The [Ca]i increased from approximately 105 nM to a maximum of approximately 1200 nM within 2 to 3 min after antigenic stimulation and then declined slowly over 30 min toward the level in unstimulated cells. Histamine release was most rapid as [Ca]i reached the maximum value and then decreased continuously with [Ca]i over the subsequent 30 min. Neither the Ca signal nor histamine release was observed when the Ca2+ concentration in the medium [( Ca]o) was less than 50 microM, but both responses were restored on readdition of Ca2+ to 1 mM. The maximal Ca signal was obtained when [Ca]o was approximately greater than 1 mM and was half-maximal at [Ca]o congruent to 0.4 mM. In marked contrast [Ca]i in unstimulated cells varied very little with [Ca]o from 0.1 to 1 mM. Maintenance of the Ca signal required the continuous presence of stimulating ligand, external Ca2+, and the maintenance of cellular ATP; metabolic inhibitors blocked or reversed the Ca signal. La+ ions also caused a rapid and reversible block of the Ca signal and histamine release. The data are interpreted in a model in which the Ca signal is generated by a La3+-sensitive signal influx pathway that is functionally independent of the normal Ca2+ influx pathway in unstimulated cells, and that allows a 10-fold or greater increase in rate of Ca2+ entry. The Ca signal is maintained dynamically by the balance between the increased Ca2+ influx and active Ca2+ efflux across the plasma membrane.lld:pubmed
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pubmed-article:6202691pubmed:articleTitleThe mechanism of the calcium signal and correlation with histamine release in 2H3 cells.lld:pubmed
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