Figure 4.
Thy-1 cross-linking augments α-galactosylceramide (αGC)-mediated cytokine secretion by mouse CD4+ invariant natural killer (iNKT) cells. N38-2C12 cells were co-incubated with bone marrow-derived dendritic cells and stimulated with αGC alone (100 ng/ml), with a low (5 μg/ml) or high (40 μg/ml) dose of G7, or with a combination of αGC and G7. After 24 hr, culture supernatants were harvested and interleukin-2 (IL-2), interferon-γ (IFN-γ) and IL-4 levels were measured by ELISA. ** and *** represent P < 0·01 and P < 0·001, respectively. Adding G7 to bone marrow-derived dendritic cells alone did not result in cytokine secretion (not shown).