Journal: The Journal of Immunology Author Choice
Article Title: Skin Metabolites Define a New Paradigm in the Localization of Skin Tropic Memory T Cells
doi: 10.4049/jimmunol.1402961
Figure Lengend Snippet: PGE 2 mediated activation of PKA results in CCR8 expression. ( A ) Naive T cells were stimulated for 5 d with anti-CD3/CD28 beads in the presence of 0.01–10 μM PGE 2 , isoproterenol or CV1808. The percentage of gated CD3 + T cells expressing CCR8 was determined by flow cytometry and plotted as mean ± SD from two to six independent experiments. ( B ) Naive T cells were incubated with PGE 2 alone or PGE 2 in the presence of 0.01–10 μM of antagonists against EP1 (SC19220), EP1/2 (AH6809), or EP4 (L161,982) prior to stimulation with anti-CD3/CD28 beads. After 5 d, the percentage of cells expressing CCR8 was determined by flow cytometry and plotted as a percentage of cells expressing CCR8 relative to PGE 2 alone. Results are plotted from two independent experiments. ( C ) Naive T cells were stimulated in the presence of 0.01–1 μM PGE 2 or the EP-selective agonists 19R(OH)-PGE 1 (EP1), butaprost (EP2), or CAY10598 (EP4). After 5 d, the percentage of CD3 + T cells expressing CCR8 was determined by flow cytometry, and results are plotted as mean ± SD from four independent experiments. ( D and E ) Naive T cells were pretreated with 0.01–1 μM of the inhibitors Raf1 kinase inhibitor 1 (RKI1), wortmannin, or PKA inhibitor peptide PKI 14–22 (PKI) prior to stimulation in the presence of PGE 2 . Representative dot plots for CCR8 expression by gated CD3 + T cells stimulated in the presence of PGE 2 alone or PGE 2 + 1 μM PKI are shown in (D), whereas bar graphs depicting the percentage of CD3 + T cells expressing CCR8 for inhibitor-treated groups relative to PGE 2 alone are plotted in (E). ( F ) Naive T cells were stimulated for 5 d in the presence of 0.1 mM of site-specific cAMP agonists selective for activation of PKA-I (2-Cl-8-MA-cAMP + 8-Pip-cAMP) and PKA-II (N6-MBC-cAMP + 8-Pip-cAMP) . The percentage of CD3 + T cells expressing CCR8 was determined by flow cytometry after 5 d and plotted as mean ± SD from two independent experiments. * p < 0.05, ** p < 0.01.
Article Snippet: The cAMP-dependent protein kinase A (PKA) inhibitor peptide (PKI) 14 –22 was obtained from Tocris Bioscience, whereas Raf1 kinase inhibitor 1 and wortmannin were from Enzo Life Sciences.
Techniques: Activation Assay, Expressing, Flow Cytometry, Incubation