2001
DOI: 10.1084/jem.193.4.497
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Activation of the Cooh-Terminal Src Kinase (Csk) by Camp-Dependent Protein Kinase Inhibits Signaling through the T Cell Receptor

Abstract: In T cells, cAMP-dependent protein kinase (PKA) type I colocalizes with the T cell receptor–CD3 complex (TCR/CD3) and inhibits T cell function via a previously unknown proximal target. Here we examine the mechanism for this PKA-mediated immunomodulation. cAMP treatment of Jurkat and normal T cells reduces Lck-mediated tyrosine phosphorylation of the TCR/CD3 ζ chain after T cell activation, and decreases Lck activity. Phosphorylation of residue Y505 in Lck by COOH-terminal Src kinase (Csk), which negatively reg… Show more

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Cited by 289 publications
(304 citation statements)
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“…A c c e p t e d M a n u s c r i p t 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 16 phosphorylation of Csk at S364 by PKA type I. Phosphorylation of Csk at S364 increases its stability and activity (phosphorylation of Lck at Y505) and consequently inactivates Lck [29,33,34]. Since the PKA type I was involved in the inhibition of TCR V9V2 by PGE 2 , we analyzed the Y505 phosphorylation status of Lck after  T cell activation in the presence of PGE 2 .…”
Section: Page 16 Of 35mentioning
confidence: 99%
“…A c c e p t e d M a n u s c r i p t 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 16 phosphorylation of Csk at S364 by PKA type I. Phosphorylation of Csk at S364 increases its stability and activity (phosphorylation of Lck at Y505) and consequently inactivates Lck [29,33,34]. Since the PKA type I was involved in the inhibition of TCR V9V2 by PGE 2 , we analyzed the Y505 phosphorylation status of Lck after  T cell activation in the presence of PGE 2 .…”
Section: Page 16 Of 35mentioning
confidence: 99%
“…In particular, elevation of intracellular cAMP in T lymphocytes has an inhibitory effect on proliferation and IL-2 production (9), and has been shown to affect early T cell activation events (10). In this study, we have investigated whether there is any relationship between the increase of intracellular cAMP and CD152 expression in human CD4 ϩ T lymphocytes.…”
mentioning
confidence: 99%
“…2A). It is well known that the effects of cAMP in immune systems are mediated by activating PKA or exchange factor directly activated by cAMP (EPAC) (36,37). Therefore, we performed the experiment using PKA-or EPAC-specific cAMP analogs.…”
Section: Cgrp Upregulates Il-9 Production From Naive T Cells Via Its mentioning
confidence: 99%