Journal: Journal of Experimental & Clinical Cancer Research : CR
Article Title: Phytosomal curcumin causes natural killer cell-dependent repolarization of glioblastoma (GBM) tumor-associated microglia/macrophages and elimination of GBM and GBM stem cells
doi: 10.1186/s13046-018-0792-5
Figure Lengend Snippet: NK1.1Ab treatment partially reverses the CCP-evoked elimination of CD133(+) GBM stem cells and CD68 high GBM cells. The GBM tumor in each mouse was cut into two parts and processed for IHC and Flow Cytometry, respectively. a - b IHC: the Vehicle-treated mouse GBM sections harbored a significant number of CD133(+) GBM stem cells (red) ( a first row). Compared to the Vehicle-treated, the CD133(+) fluorescence showed a 72% decrease in the CCP-treated ( * p = 6.5 × 10 − 3 CCP versus Vehicle) ( a , second row and b ) and a 41% decrease in the CCP + NK1.1-treated mice ( a third row and b ) (Δ p < 0.02, CCP + NK1.1 versus CCP; ** p = 0.03, CCP + NK1.1 versus Vehicle). (Scale bar: 47.62 μm). c - f Flow Cytometry: compared to the Vehicle-treated, the CD133(+) cells ( c , top, red circle) were suppressed by 81% in the CCP-treated ( c middle and CD133 IF shown in d ) (* p < 0.05, CCP versus Vehicle) and by 32% in the CCP + NK1.1 mice ( c , bottom, and d ) (Δ p < 0.03, CCP + NK1.1 versus CCP; ** p = 3.0 × 10 − 3 , CCP + NK1.1 versus Vehicle). e The fluorescence profiles of the CD133(+) cells in the Vehicle, CCP, and CCP + NK1.1 samples. f - h The GBM cells were also probed for CD68, and active-caspase-3 (Act. Cspse 3). f i In the Vehicle-treated, two segregated populations of CD68(+) but Cspse3(−) cells were identified (Lower Right, LR). The larger population (shown within the blue circle) was CD68 high (presumably GBM cells) whereas a smaller population (shown within the green circle) was CD68 low (expected to be the TAM) [ , , ]. A very small population of CD68(+), Act. Cspse3(+) (double positive) cells was identified in the upper right (UR) quadrant (within the red ellipse). f ii In the CCP-treated, CD68 high cells showed an 1187% increase in Act. Cspse 3 IF (red ellipse in the UR quadrant) with respect to Vehicle, along with the virtual disappearance of the CD68 high but Cspse3(−) cells in the blue circle in the LR quadrant (* p = 0.036, CCP versus Vehicle) ( f ii and g ). The Act. Cspse 3 IF increased by 343% in the CCP + NK1.1 samples, along with the reappearance of some CD68 hgh but Act. Cspse 3(−) cells in the blue circle in the LR quadrant ( f iii and g ) (Δ p < 0.04, CCP versus CCP + NK1.1; ** p = 3.1 × 10 − 3 , CCP + NK1.1 versus Vehicle). ( f iv ) Fluorescence profiles for Act.Cspse 3. The CD68 fluorescence in CD68 low cells (TAM) was not significantly different in the three groups ( h ). The graphs represent mean ± S.D. obtained from mice treated with Vehicle ( n = 4), CCP ( n = 4), and CCP + NK1.1 ( n = 3)
Article Snippet: Antibodies against Iba1 (C20) (1:50), iNOS (rabbit IgG) (NOS2 sc-651) (1:100), ARG1 (rabbit IgG) (sc-20,150) (1:100), NKp46 (1:100), IL12p40 (1:50), IL10 (1:50), CD68 (H-255) (Rabbit IgG) (sc-9139) (1:50), Active-Caspase3 (Asp175) (Rabbit IgG) (CST #9661) (1:100), and CD133 (1:50) were used for staining.
Techniques: Flow Cytometry, Fluorescence