To investigate whether RGS19 is affected by inhibition of Notch
signaling, Western blotting and flow cytometry using an RGS19-
specific Ab were used. As shown in Fig. 2B and C, decreased levels
of RGS19 was detected using both techniques. Using Western blotting,two
bands appeared as specific bands forRGS19 that were later
verified by specific gene silencing (Fig. 4B). The band with higher
molecular weight, which corresponded to approximately 29 kDa,
was considered phosphorylated RGS19 (Feigin and Malbon, 2007).
LPS treatment increased the band intensity of the phosphorylated
RG19 and GSI treatment decreased its level. LPS stimulation or GSI
treatment did not affect the level of the unphosphorylated RGS19
(Fig. 2B). Using intracellular staining,the significant decreased level
of RGS19 was observed. Because intracellular staining cannot distinguish
between phosphorylated and unphosphorylated form,this
decrease in the staining may indicate that antibody used in our
study recognizes a phosphorylated form better (Fig. 2C). When the
mRNA levels of rgs19 were compared using qPCR, LPS treatment
gradually decreased the rgs19 mRNA level, but no differences were
detected between the DAPT and DMSO treatments (Fig. 2D).