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dc.contributor.authorSmith, Ian F
dc.contributor.authorParkerm, Ian
dc.contributor.authorWiltgen, Steven M
dc.contributor.authorShuai, Jianwei
dc.contributor.author帅建伟
dc.date.accessioned2011-07-18T09:15:03Z
dc.date.available2011-07-18T09:15:03Z
dc.date.issued2009
dc.identifier.citationSCIENCE SIGNALING,2009,2(98)zh_CN
dc.identifier.issn1937-9145
dc.identifier.urihttp://dx.doi.org/doi:10.1126/scisignal.2000466
dc.identifier.urihttps://dspace.xmu.edu.cn/handle/2288/10215
dc.description.abstractIntracellular calcium ion (Ca2+) signaling crucially depends on the clustered organization of inositol trisphosphate receptors (IP(3)Rs) in the endoplasmic reticulum (ER) membrane. These ligand-gated ion channels liberate Ca2+ to generate local signals known as Ca2+ puffs. We tested the hypothesis that IP3 itself elicits rapid clustering of IP(3)Rs by using flash photolysis of caged IP3 in conjunction with high-resolution Ca2+ imaging to monitor the activity and localization of individual IP(3)Rs within intact mammalian cells. Our results indicate that Ca2+ puffs arising with latencies as short as 100 to 200 ms after photorelease of IP3 already involve at least four IP3R channels, and that this number does not subsequently grow. Moreover, single active IP(3)Rs show limited mobility, and stochastic simulations suggest that aggregation of IP(3)Rs at puff sites by a diffusional trapping mechanism would require many seconds. We thus conclude that puff sites represent preestablished, stable clusters of IP(3)Rs and that functional IP(3)Rs are not readily diffusible within the ER membrane.zh_CN
dc.language.isoenzh_CN
dc.publisherAMER ASSOC ADVANCEMENT SCIENCEzh_CN
dc.titleCa2+ Puffs Originate from Preestablished Stable Clusters of Inositol Trisphosphate Receptorszh_CN
dc.typeArticlezh_CN


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