Journal: JCI Insight
Article Title: DLL4/Notch3/WNT5B axis mediates bidirectional prometastatic crosstalk between melanoma and lymphatic endothelial cells
doi: 10.1172/jci.insight.171821
Figure Lengend Snippet: ( A ) Schematic of the workflow. WM852 melanoma cells were treated with siRNAs for 24 hours and cultured as monotypic cultures (siCtrl) or with LEC (siCtrl*, si WNT5B *). After 2 days, the 2 cell types were separated and melanoma cells were injected intradermally into mouse ear pinna. After 1 week, mice were sacrificed and the ears, lungs, liver, and superficial and inguinal lymph nodes were harvested and processed for analyses. Schematics generated with BioRender.com. ( B ) Representative images of the GFP-expressing WM852 melanoma cells (siCtrl, siCtrl*, si WNT5B *) in mouse ear pinna epidermis. Dashed line indicates the boundaries of injected melanoma cells and arrowheads show the diffuse growth phenotype of the siCtrl* melanoma cells. The relative size of areas occupied by GFP + melanoma cells was quantified from each mouse ear. Relative size for the GFP + area of each mouse ear is shown (siCtrl, n = 4; siCtrl*, n = 8; si WNT5B *, n = 8; where n refers to number of ears quantified). Scale bar: 200 μm. ( C ) qPCR for the relative human Alu sequences from the mouse superficial cervical lymph nodes. Mouse genomic actin was used as a control. Single values for each mouse are shown. Day 7 (d7): siCtrl, n = 3; siCtrl*, n = 5; si WNT5B *, n = 5. d14: siCtrl, n = 1, siCtrl*, n = 3, si WNT5B *, n = 3. ( D ) Mouse ear xenografts were generated from WM852 cells as described in A . Superficial cervical lymph nodes were harvested after 8 and 14 days and analyzed by FACS for the presence of GFP + tumor cells. Lymph nodes from untreated mice (no cells) were used as controls. Single values for each mouse are shown (siCtrl, n = 1; siCtrl*, n = 3; si WNT5B *, n = 3). Data are presented as mean ± SD. * P < 0.05, ** P < 0.01, **** P < 0.0001 by 1-way ANOVA followed by Tukey’s multiple-comparison test ( B and C , d7 samples) or 1-tailed t test (panel C d14 samples and D ).
Article Snippet: Where indicated, γ-secretase inhibitor DAPT (Sigma-Aldrich) at 10 μM concentration and recombinant WNT5B protein (7347, R&D Systems) at 1000 ng/mL were applied.
Techniques: Cell Culture, Injection, Generated, Expressing, Control, Comparison