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- W2035051850 abstract "The expression and functional significance of ryanodine receptors (RyR) were investigated in resting and activated primary human T cells. RyR1, RyR2, and RyR3 transcripts were detected in human T cells. RyR1/2 transcript levels increased, whereas those of RyR3 decreased after T cell activation. RyR1/2 protein immunoreactivity was detected in activated but not in resting T cells. The RyR agonist caffeine evoked Ca(2+) release from the intracellular store in activated T cells but not in resting T cells, indicating that RyR are functionally up-regulated in activated T cells compared with resting T cells. In the presence of store-operated Ca(2+) entry (SOCE) via plasmalemmal Ca(2+) release-activated Ca(2+) (CRAC) channels, RyR blockers reduced the Ca(2+) leak from the endoplasmic reticulum (ER) and the magnitude of SOCE, suggesting that a positive feedback relationship exists between RyR and CRAC channels. Overexpression of fluorescently tagged RyR2 and stromal interaction molecule 1 (STIM1), an ER Ca(2+) sensor gating CRAC channels, in HEK293 cells revealed that RyR are co-localized with STIM1 in the puncta formed after store depletion. These data indicate that in primary human T cells, the RyR are coupled to CRAC channel machinery such that SOCE activates RyR via a Ca(2+)-induced Ca(2+) release mechanism, which in turn reduces the Ca(2+) concentration within the ER lumen in the vicinity of STIM1, thus facilitating SOCE by reducing store-dependent CRAC channel inactivation. Treatment with RyR blockers suppressed activated T cell expansion, demonstrating the functional importance of RyR in T cells." @default.
- W2035051850 created "2016-06-24" @default.
- W2035051850 creator A5062097208 @default.
- W2035051850 creator A5078668925 @default.
- W2035051850 creator A5090359512 @default.
- W2035051850 date "2012-10-01" @default.
- W2035051850 modified "2023-10-18" @default.
- W2035051850 title "Bidirectional Coupling between Ryanodine Receptors and Ca2+ Release-activated Ca2+ (CRAC) Channel Machinery Sustains Store-operated Ca2+ Entry in Human T Lymphocytes" @default.
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- W2035051850 doi "https://doi.org/10.1074/jbc.m112.398974" @default.
- W2035051850 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3481322" @default.
- W2035051850 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22948152" @default.
- W2035051850 hasPublicationYear "2012" @default.
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