Were calculated based on the mean fluorescence intensity of cytokine standards. The limit of detection was 1.4 pg/ml. The intra-assay variance was,10.8 and the inter-assay variance adds up to,12.5 .Placebo Effects on the Immune ResponseIntracellular Cytokine StainingIntracellular IL-2 of activated CD4+T cells was detected by flow cytometry using Intracellular Cytokine 498-02-2 site staining Starter Kit ?Human (BD Pharmingen). PBMC (1 ml; 2.56106 cells/ml) were incubated for 3.5 h (37uC, 5 CO2) with 2 ml Leukocyte Activation Cocktail (BD Pharmingen), containing PMA, ionomycin and the protein transport inhibitor brefeldin A. Cells were double-stained with PE-Cy7 conjugated anti-human CD3 (clone SK7; BD Pharmingen) and APC conjugated anti-human CD4 (clone RPA-T4, BD Pharmingen) antibodies to characterize CD4+T cells. Cells were fixed and permeabilized using Cytofix/ Cytoperm Buffer containing a mixture of paraformaldehyde and saponin. Perm/Wash Buffer maintains the cellular permeability and was used for washing- and intracellular staining steps. PE conjugated anti-human IL-2 (clone MQ1-17H12, BD Pharmingen) antibody was used for intracellular cytokine staining. The percentage of IL-2 producing CD4+T cells was analyzed on a FACS Canto II flow cytometer using FACS Diva 6.01 software (BD Immunocytometry Systems, Heidelberg, Germany).Manipulation of ExpectationIn experiment C, subjects were randomly allocated to four groups differing in the suggested probability (25 , 50 , 75 , 100 ) of receiving the immunosuppressive drug CsA. Subjects of the four expectation groups did not differ in sociodemographic and screening variables, i.e., age, body mass index, smoking behavior, Beck Depression Inventory scores and in behavioral trait anxiety variables. Furthermore, groups did not significantly differ in cardiovascular parameters before and after induced expectation (Table S2). IL-2 levels in culture supernatants of anti-CD3 stimulated PBMC were analyzed before (baseline) and after intake of the placebo pills (expectation effect) to determine the effect of different expectations on IL-2 release. The expectation of receiving an immunosuppressive drug did not significantly affect IL2 secretion in any of the 4 probability-groups (ANOVA; group effect, F = 1.2; p = 0.33; interaction effect, F = 1.1; p = 0.35) (Fig. 3A). As an additional parameter, the percentage of IL-2 producing PMA/Ionomycin-stimulated CD4+T cells was analyzed before and after the pill intake by intracellular cytokine staining. Again, these results did not show a significant reduction of IL-2 producing CD4+T cells 1407003 in any of the four expectation groups compared to the control condition during baseline (ANOVA; group effect, F = 0.4; p = 0,732; interaction effect, F = 1.2; p = 0.334) (Fig. 3B).Behavioral MeasuresSociodemographical data were collected from all participants. Subjects also completed the state version of the State-TraitAnxiety-Inventory (STAI) [22] and Beck Depression Inventory scores (BDI) [23] in order to document possible group differences in present state negative emotions (STAI) and depressive symptoms.DiscussionThe placebo response is generated by two distinct but interrelated mechanisms across different SPI-1005 chemical information physiological systems and clinical conditions. One of these mechanisms concerns suggestion and expectation, the other one learning via behavioral conditioning. While for example placebo analgesia is mediated through cognitive factors as well as learning procedures it still remains un.Were calculated based on the mean fluorescence intensity of cytokine standards. The limit of detection was 1.4 pg/ml. The intra-assay variance was,10.8 and the inter-assay variance adds up to,12.5 .Placebo Effects on the Immune ResponseIntracellular Cytokine StainingIntracellular IL-2 of activated CD4+T cells was detected by flow cytometry using Intracellular Cytokine Staining Starter Kit ?Human (BD Pharmingen). PBMC (1 ml; 2.56106 cells/ml) were incubated for 3.5 h (37uC, 5 CO2) with 2 ml Leukocyte Activation Cocktail (BD Pharmingen), containing PMA, ionomycin and the protein transport inhibitor brefeldin A. Cells were double-stained with PE-Cy7 conjugated anti-human CD3 (clone SK7; BD Pharmingen) and APC conjugated anti-human CD4 (clone RPA-T4, BD Pharmingen) antibodies to characterize CD4+T cells. Cells were fixed and permeabilized using Cytofix/ Cytoperm Buffer containing a mixture of paraformaldehyde and saponin. Perm/Wash Buffer maintains the cellular permeability and was used for washing- and intracellular staining steps. PE conjugated anti-human IL-2 (clone MQ1-17H12, BD Pharmingen) antibody was used for intracellular cytokine staining. The percentage of IL-2 producing CD4+T cells was analyzed on a FACS Canto II flow cytometer using FACS Diva 6.01 software (BD Immunocytometry Systems, Heidelberg, Germany).Manipulation of ExpectationIn experiment C, subjects were randomly allocated to four groups differing in the suggested probability (25 , 50 , 75 , 100 ) of receiving the immunosuppressive drug CsA. Subjects of the four expectation groups did not differ in sociodemographic and screening variables, i.e., age, body mass index, smoking behavior, Beck Depression Inventory scores and in behavioral trait anxiety variables. Furthermore, groups did not significantly differ in cardiovascular parameters before and after induced expectation (Table S2). IL-2 levels in culture supernatants of anti-CD3 stimulated PBMC were analyzed before (baseline) and after intake of the placebo pills (expectation effect) to determine the effect of different expectations on IL-2 release. The expectation of receiving an immunosuppressive drug did not significantly affect IL2 secretion in any of the 4 probability-groups (ANOVA; group effect, F = 1.2; p = 0.33; interaction effect, F = 1.1; p = 0.35) (Fig. 3A). As an additional parameter, the percentage of IL-2 producing PMA/Ionomycin-stimulated CD4+T cells was analyzed before and after the pill intake by intracellular cytokine staining. Again, these results did not show a significant reduction of IL-2 producing CD4+T cells 1407003 in any of the four expectation groups compared to the control condition during baseline (ANOVA; group effect, F = 0.4; p = 0,732; interaction effect, F = 1.2; p = 0.334) (Fig. 3B).Behavioral MeasuresSociodemographical data were collected from all participants. Subjects also completed the state version of the State-TraitAnxiety-Inventory (STAI) [22] and Beck Depression Inventory scores (BDI) [23] in order to document possible group differences in present state negative emotions (STAI) and depressive symptoms.DiscussionThe placebo response is generated by two distinct but interrelated mechanisms across different physiological systems and clinical conditions. One of these mechanisms concerns suggestion and expectation, the other one learning via behavioral conditioning. While for example placebo analgesia is mediated through cognitive factors as well as learning procedures it still remains un.
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