Research Paper Jagged2 Progressively Increased Expression .

Int. J. Biol. Sci. 2020, Vol. 16The BC growth in living animals were measured(i.e., expressed as tumor volume with the valuecalculated as: width2 x length) at the time points ofdays 10, 14, 18, 21, 25 and 28 after the implantation ofUMUC3 cell line in the left and right backs of nudemice.The tumors were removed immediately aftereuthanizing the animals at day 28 after implantationof BC cell line of UMUC3. After tumor measurement,the specimens were cut into pieces and fixed withOCT (Tissue-Tek) for immunohistochemical (IHC)staining. The dosage of Mel was based on ourprevious report [36] with some modifications.shRNA clone transfectionshRNA clones were obtained from the NationalRNAi Core Facility Platform located at the Institute ofMolecular Biology/Genomic Research Center,Academia Sinica, supported by the National CoreFacility Program for Biotechnology Grants of NSC(NSC 100–2319-B-001–002). Individual clone wasidentified by its unique TRC number (e.g. ient transfection of cells with plasmids wasperformed with Lipofectamine 3000 (Invitrogen, Lifetechnologies, Carlsbad, CA, USA) according to themanufacturer’s instructions with slight modifications.Briefly, 1 106 cells were seeding to 10 cm plastic dishovernight. For use in transfection, 4 μl ofLipofectamine 3000 was incubated with 2 μg ofindicated plasmid at room temperature. Cells wereincubated at 37 C in a humidified atmosphere of 5%CO2. Following additional incubation of transfectedcells overnight, transfected cells were selected with 1μg/mL puromycin. qRT-PCR technique wasperformed to evaluate the efficiency of JAG2 silenced.siNotch1 transfectionTransient transfection of cells with siNotch1 wasperformedwithLipofectamine RNAiMAXTransfection Reagent (Invitrogen, Life technologies,Carlsbad, CA, USA) according to the manufacturer’sinstructions with minimal modification. Briefly, 50%confluent cells were growing to 6-cm plastic dishovernight. For use in transfection, 18μl ofLipofectamine RNAiMAX Transfection Reagent wasincubated with 60 pmol of siNotch1 at roomtemperature for 5 minutes. After the complex wasadded to the cells, the cells were incubated at 37 C ina humidified atmosphere of 5% CO2 for 72 hours.qRT-PCR technique was performed to evaluate theefficiency of Notch1 silenced.Cell cultureThe BC cell lines of HT1197, HT1376, RT4 (Bioresource Collection and Research Center, Taiwan) and2650UM-UC-3 (i.e., UMUC3) [ATCC CRL-1749 (American Type Culture Collection, USA)], andnormal bladder cell line of SV-HUC-1 (BioresourceCollection and Research Center, Taiwan) were grownin Dulbecco’s modified Eagle’s medium (highglucose) supplemented with 10% fetal bovine serumand l% penicillin/streptomycin. All cultured cellswere grown at 37 C and 5% CO2.MTT cell viability assayCell growth was determined by the MTT assay.About 2 103 cells in 100 µL of medium were seededinto wells of a 96-well plate and incubated for theindicated duration. At the end of incubation, MTTsolution was added into each well. After incubation,the purple crystal sediment was dissolved in DMSOand read at 540 nm in an ELISA reader. Theabsorbance value was used to represent the cellnumber.Assessment of colony formationTo determine the colony formation, 2000 cellsper well were seeded in 6‐well dish with or withoutMel (2.0 mM). After 7 day’s seeding, the cells werefixed and permeabilized with methanol. Followingwashing twice with PBS, the colony was identified bymicroscope after 10% Giemsa solution (SigmaCorporation, Cream Ridge, NJ, USA) staining.Wound healing assayFor wound healing assay, 3.5 x 104 cells wereseeded in 12 wells with linear spacer inserts.Following overnight cell culture, a regular anddefined “wound” within the cell monolayer wascreated by removing the linear spacer inserts. Afterphosphate‐buffered saline wash, the wells were eitherleft untreated or treated with Mel (2.0 mM). After 24‐hour incubation, the migration of cells into thedenuded areas in the marked region was monitored.The migration was captured with microphotography,and the total migration distance was determinedusing Image J software (National Institutes of Health,Bethesda, MD, USA).Transwell migration assayCells were first trypsinized and 5 104 cells werethen added to the Boyden chambers (8 µm pore size;Millipore, Billerica, MA, USA) with 0.5% FBScontaining medium and assay media that contained10% FBS was added to the culture plates. After 24hour incubation, the nonmotile cells at the top of thefilter were removed and the motile cells at the bottomof the filter were fixed with methanol and stainedwith one‐tenth dilution of Giemsa (SigmaCorporation). The number of migrated cells in eachchamber was carefully counted in five randomlyhttp://www.ijbs.com

Int. J. Biol. Sci. 2020, Vol. 16chosen fields under the microscope for threeindependent experiments.Transwell invasion assayCells were plated in 0.5% FBS‐containingmedium on the upper Boyden chamber coated with100 μL of 10% Matrigel and 10% FBS‐containingmedium in the lower chamber. Two days later, cellson the apical side of each insert were scraped off, andthose of invading cells on the basolateral side of themembrane were fixed and stained the same asTranswell migration assay. The number of invadingcells was counted in five randomly chosen fieldsunder the microscope for three independentexperiments.Western blot analysisEqual amounts (30 µg) of protein extracts wereseparated by 8-12% SDS-PAGE. After electrophoresis,the separated proteins were transferred onto a polyvinylidene difiuoride (PVDF) membrane (AmershamBiosciences, Amersham, UK). Nonspecific sites wereblocked by incubation of the membrane in blockingbuffer [5% nonfat dry milk in T-TBS (TBS containing0.05%Tween 20)] at room temperature for one hour.Then the membranes were incubated with theindicated primary antibodies [Notch (1:1000, Abcam),Jagged2 (1:1000, Signa Aldrich), matrix metalloproteinase (MMP)-2 (1:1000, Cell Signaling), MMP-9(1:1000, Abcam), nuclear factor (NF)-κB (1:1000,Abcam), tumor necrosis factor (TNF)-α (1:1000, CellSignaling), AKT (1: 1000, Cell Signaling),phosphorylated (p)-AKT (1: 1000, Cell Signaling),phospho-p38 (1: 1000, Cell Signaling), phosphomTOR (1:1000, Cell Signaling), p53 (1:1000, CellSignaling), cleaved caspase3 (1:1000, Cell Signaling),mitochondrial Bax (1:1000, Abcam), Bcl-2 (1:1000,biorbyt), Blc-xL (1:1000, Abcam), LC3B (1:1000, CellSignaling), Cox IV (1:10000, Abcam) and GAPDH (1:10000, Cell Signaling)] for 1 hour at roomtemperature. Horseradish peroxidase-conjugatedanti-rabbit or anti-mouse immunoglobulin IgG(1:2000, Cell Signaling, Danvers, MA, USA) was usedas a secondary antibody for one-hour incubation atroom temperature. After being washed, the Immunoreactive membranes were visualized by enhancedchemiluminescence (ECL; Amersham Biosciences,Amersham, UK) and were exposed to medical X-rayfilm (FUAJI).Immunohistochemical (IHC) andimmunofluorescent (IF) stainingIn detail, for those of IHC and IF staining,rehydrated paraffin sections were first treated with3% H2O2 for 30 minutes and incubated with2651Immuno-Block reagent (BioSB, Santa Barbara, CA,USA) for 30 minutes at room temperature. Sectionswere then incubated with primary antibodiesspecifically against MMP-2 (1:200, Invitrogen, CA,USA), MMP-9 (1:200, Invitrogen, CA, USA), Jagged2(1:100, Abcam, Cambridge, UK) and Notch (1:150,Abcam, Cambridge, UK), while sections incubatedwith the use of irrelevant antibodies served ascontrols. Immunoreactive were visualized byenhanced DAB kit (Abcam).Statistical analysisQuantitative data were expressed as mean SEM. Statistical analysis was adequately performedby ANOVA followed by Bonferroni multiplecomparison post hoc test. SAS statistical software forWindows version 8.2 (SAS Institute, Cary, NC, USA)was utilized. A probability value 0.05 wasconsidered statistically significant.ResultsThe Jagged2 expression were significantly andprogressively enhanced from T1 to T3 (i.e.,primary tumor size) and from stage I to IIITo elucidate whether a good correlation betweenthe primary tumor size and the intensity of Jagged2expression, the tissue array of human BC was utilizedthe study. As was expected, the Jagged2 expressionthe primary tumor was significantly progressivelyupregulated from T1 to T3 (Figure 1). Additionally, tofurther assess whether there also had a goodassociation between the BC Stage and the intensity ofJagged2 expression, we further analysis with thetissue array. Consistently, the Jagged2 expression wassignificantly progressively augmented from stage I toIII. These findings highlighted that Jagged2 proteincould played a crucial role on BC growth,proliferation and invasion.The JAG2 gene expression in carcinoma ofurogenital organTo furthermore elucidate the JAG2 geneexpression in urothelial carcinoma, data mining wasperformed from the cancer microarray databaseOncomine 4.0 (Oncomine DB at http://www.oncomine.org) [37, 38]. The result demonstrated thatthe JAG2 RNA expression (i.e., from microarraydatabase) was significantly higher in infiltrating BC(i.e., TCC) and further higher in superficial BC thanthe normal control (Figure 2). This finding furthersupported that there had a strongly positivecorrelation between the Jagged2 expression and theBC stage.http://www.ijbs.com

Int. J. Biol. Sci. 2020, Vol. 162652Figure 1. The correlation between Jagged2 expression and tumor stage and primary tumor size in tissue array. A) Illustrating immunohistochemical (IHC)staining of the tissue array for identification of Jagged2 expression. Green circle indicated the stage I bladder cancer (BC); Blue circle indicated stage II BC; Red circle indicatedstage III BC. B to D) Showing the IHC stain for histopathologic finding for clarifying the BC in stage I (B), stage II (C) and stage III (D), respectively. E) Analytical result of intensityJagged2 expression (i.e., scoring) in BC stages, vs. stage I, P 0.01; vs. stage I, p 0.001. F) Analytical result of intensity Jagged2 expression (i.e., scoring) in primary tumor size, vs. T1, P 0.01; vs. T1, p 0.001; vs. T1, p 0.0001.http://www.ijbs.com

Int. J. Biol. Sci. 2020, Vol. 16Figure 2. The JAG2 gene expression in bladder cancer (BC). Analyticalresult of JAG2 RNA expression was significantly higher in infiltrating type (i.e.,localized in muscle layer) of BC and further higher in superfici

Research Paper Jagged2 progressively increased expression from Stage I to III . 2. Center for Shockwave Medicine and Tissue Engineering, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung, Taiwan. 3. Division of Cardiology, Department of Internal Medicine, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine .