pubmed-article:2519622 | rdf:type | pubmed:Citation | lld:pubmed |
pubmed-article:2519622 | lifeskim:mentions | umls-concept:C0086418 | lld:lifeskim |
pubmed-article:2519622 | lifeskim:mentions | umls-concept:C0039194 | lld:lifeskim |
pubmed-article:2519622 | lifeskim:mentions | umls-concept:C2752508 | lld:lifeskim |
pubmed-article:2519622 | lifeskim:mentions | umls-concept:C1383501 | lld:lifeskim |
pubmed-article:2519622 | lifeskim:mentions | umls-concept:C1167322 | lld:lifeskim |
pubmed-article:2519622 | lifeskim:mentions | umls-concept:C0596235 | lld:lifeskim |
pubmed-article:2519622 | lifeskim:mentions | umls-concept:C0521116 | lld:lifeskim |
pubmed-article:2519622 | pubmed:issue | 1 | lld:pubmed |
pubmed-article:2519622 | pubmed:dateCreated | 1992-2-6 | lld:pubmed |
pubmed-article:2519622 | pubmed:abstractText | A rapid rise in the level of cytosolic free calcium ([Ca2+]i) is believed to be one of several early triggering signals in the activation of T lymphocytes by antigen. Although Ca2+ release from intracellular stores and its contribution to Ca2+ signaling in many cell types is well documented, relatively little is known regarding the role and mechanism of Ca2+ entry across the plasma membrane. We have investigated mitogen-triggered Ca2+ signaling in individual cells of the human T-leukemia-derived line, Jurkat, using fura-2 imaging and patch-clamp recording techniques. Phytohemagglutinin (PHA), a mitogenic lectin, induces repetitive [Ca2+]i oscillations in these cells peaking at micromolar levels with a period of 90-120 s. The oscillations depend critically upon Ca2+ influx across the plasma membrane, as they are rapidly terminated by removal of extracellular Ca2+, addition of Ca(2+)-channel blockers such as Ni2+ or Cd2+, or membrane depolarization. Whole-cell and perforated-patch recording methods were combined with fura-2 measurements to identify the mitogen-activated Ca2+ conductance involved in this response. A small, highly selective Ca2+ conductance becomes activated spontaneously in whole-cell recordings and in response to PHA in perforated-patch experiments. This conductance has properties consistent with a role in T-cell activation, including activation by PHA, lack of voltage-dependent gating, inhibition by Ni2+ or Cd2+, and regulation by intracellular Ca2+. Moreover, a tight temporal correlation between oscillations of Ca2+ conductance and [Ca2+]i suggests a role for the membrane Ca2+ conductance in generating [Ca2+]i oscillations in activated T cells. | lld:pubmed |
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pubmed-article:2519622 | pubmed:language | eng | lld:pubmed |
pubmed-article:2519622 | pubmed:journal | http://linkedlifedata.com/r... | lld:pubmed |
pubmed-article:2519622 | pubmed:citationSubset | IM | lld:pubmed |
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pubmed-article:2519622 | pubmed:status | MEDLINE | lld:pubmed |
pubmed-article:2519622 | pubmed:month | Nov | lld:pubmed |
pubmed-article:2519622 | pubmed:issn | 1044-2030 | lld:pubmed |
pubmed-article:2519622 | pubmed:author | pubmed-author:CahalanM DMD | lld:pubmed |
pubmed-article:2519622 | pubmed:author | pubmed-author:LewisR SRS | lld:pubmed |
pubmed-article:2519622 | pubmed:issnType | Print | lld:pubmed |
pubmed-article:2519622 | pubmed:volume | 1 | lld:pubmed |
pubmed-article:2519622 | pubmed:owner | NLM | lld:pubmed |
pubmed-article:2519622 | pubmed:authorsComplete | Y | lld:pubmed |
pubmed-article:2519622 | pubmed:pagination | 99-112 | lld:pubmed |
pubmed-article:2519622 | pubmed:dateRevised | 2009-11-18 | lld:pubmed |
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pubmed-article:2519622 | pubmed:meshHeading | pubmed-meshheading:2519622-... | lld:pubmed |
pubmed-article:2519622 | pubmed:year | 1989 | lld:pubmed |
pubmed-article:2519622 | pubmed:articleTitle | Mitogen-induced oscillations of cytosolic Ca2+ and transmembrane Ca2+ current in human leukemic T cells. | lld:pubmed |
pubmed-article:2519622 | pubmed:affiliation | Department of Physiology and Biophysics, California College of Medicine, University of California, Irvine 92717. | lld:pubmed |