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pubmed-article:1650873pubmed:abstractTextLeukotriene C4 (LTC4), one of the major constituents of the slow reacting substance of anaphylaxis, induced a dose-dependent hydrolysis of phosphoinositides in [3H]inositol-prelabeled rat basophilic leukemia (RBL-1) cells. The EC50 for LTC4 to elicit the half maximum accumulation of [3H]inositol phosphates (IPs) was around 20 nM. The increase in the formation of [3H]inositol bisphosphate (IP2) and [3H]inositol trisphosphate (IP3) was detectable at 2 min after the stimulation and progressed up to 30 min. Accumulation of [3H]inositol monophosphate (IP1) was observed only during the late phase of 5-30 min in the presence of LiCl. When cells were stimulated with LTC4 and LTD4 together, there was no additive accumulation in [3H]IPs. Pretreatment of cells with either LTC4 or LTD4 resulted in a decrease in production of [3H]IPs on further stimulation with the same agonist. The desensitization appeared to be heterologous since pretreatment of cells with LTC4 attenuated the responsiveness to LTD4. Conversely, pretreatment with LTD4 also diminished the responsiveness to LTC4 markedly. These results suggest that both LTC4- and LTD4-induced hydrolysis of phosphoinositides are mediated through the same effector in RBL-1 cells.lld:pubmed
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pubmed-article:1650873pubmed:authorpubmed-author:SunG YGYlld:pubmed
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pubmed-article:1650873pubmed:pagination455-63lld:pubmed
pubmed-article:1650873pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:1650873pubmed:articleTitleLeukotriene C4-induced phosphoinositide hydrolysis in rat basophilic leukemia cell.lld:pubmed
pubmed-article:1650873pubmed:affiliationInstitute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan, Republic of China.lld:pubmed
pubmed-article:1650873pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:1650873pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed