(F) pNK cells were pretreated with either SHP-1 and Cbls siRNA-loaded NPs or N.S siRNA-loaded NPs. After 48 hours, cells were incubated with either 721.221 Cw4 or Cw7 target cells for 2 hours and analyzed by flow cytometry to determine the expression of CD107a. Expression of CD107a was quantitated by mean fluorescence intensity (MFI). The data represent five independent experiments (n=5) Data are shown as mean ± SEM.) (n=5). P values were calculated by One-sample t-tests and One way ANOVA following Tukey's post hoc analysis, and are indicated by asterisks. *P≤0.05. 