Pylori strain SS1 was provided by Prof. Steffen Backert (School of Biomolecular Biomedical Science, University College Dublin). For the infection, bacteria were harvested in BHI-medium.Experimental InfectionAnimals were divided in four groups: (A) sham inoculated wt mice; (B) H. Title Loaded From File pylori-infected wt- mice; (C) sham inoculated ctsz2/2 mice; and (D) H. pylori-infecetd wt- mice. At 8 weeks of age, wt and ctsz2/2 mice of both genders were orally infected with 108 cfu SS1 or B128 in 200 ml of BHI-medium or medium alone three times per week. For the infection of primary gastric epithelial cells,Cathepsin X and Premalignant Host ResponseQuantitative Real-time PCR AnalysisAssays were performed on the LightCyclerTM (Roche Diagnostics, Mannheim, Germany). Several dilutions of plasmids containing cDNA fragments of different genes were used as internal controls. For plasmid construction, the cDNA fragments were amplified using the following primers: H. pylori (F, 59 – CTG GAG AGA CTA AGC CCT CC ?9; R, 59 – ATT ACT GAC GCT GAT TGT GC -39) mIL-1b (F, 59-CAACCAACAAGTGATATTCTCCATG-39; R, 59-GATCCACACTCTCCAGCTGCA-39) mCxcl1/KC (F, 59-GCACCCAAACCGAAGTCATAGC-39; R, 59TTGTCAGAAGCCAGCGTTCACC-39), mMCP-1 (F, 59GCTCTCTCTTCCTCCACCACCAT-39; R, 59GCTCTCCAGCCTACTCATTGGGAT-39), mIL-6 (F, 5-CACAAAGCCAGAGTCCTTCAGAGA-39; R, 5CTAGGTTTGCCGAGTAGATCTC-39) and m-actin (F, 5CTGGGTCATTCTTTTCACGGT-39; R, 5-ACTGGGACGACATGGAGAAG-39). The same primers were used for qPCRreactions. PCR-products were inserted into the pCR2.1-TOPO vector (Invitrogen, Groningen, The Netherlands). The copy number of the resulting plasmids was calculated after DNA quantification. Using TriFastTM reagent (Peqlab), we extracted total RNA from tissue samples 1315463 according to the manufacturer`s instructions. RNA was reverse-transcribed using Transcriptor High Fidelity cDNA Kit (Roche). PCR-reactions were performed using the qPCR Mastermix kit (Quantace, London) according to the manufacturer`s instructions. The standard temperature profile included initial denaturation for 10 min at 95uC, followed by 35 cycles of denaturation at 95uC for 15 s, annealing at 52uC to 60uC (primer dependent) for 15 s, and extension at 72uC for 10 s. Mouse actin served as a housekeeping gene. The relative abundance (fold changes against uninfected controls) was calculated using the delta delta Ct method (22DDCt). All oligonucleotide primers were purchased from BioTez (Berlin, Germany). The PCR-products were analyzed on a 1.8 agarose gel and visualized by ethidium bromide staining.Statistical AnalysisData are expressed as Box plots or scatter plots (median values). GraphPad Prism Using a LI-COR Odyssey machine V3.0 to detect global caspase activation. software was used for statistical analysis. Statistical analyses were performed using the Mann-Whitney U test for unpaired groups. A p-value of 0.05 was set to be the level of significance. Systematic deviances between staining and quantitative PCR were tested using Bowker’s test. Furthermore, the level of agreement was evaluated using Cohen’s kappa. All tests were deliberately carried out to the full level of significance. Analyses were made using SPSS Statistics 19.0 (IBM Corporation, NY, USA).ResultsWt and ctsz2/2 mice were inoculated with either H. pylori SS1 or B128 strain (n = 49). According to the results of quantitative H. pylori-PCR and histological tests, at 12 weeks, almost all SS1inoculated (96 ), but only 50 of B128-inoculated mice were infected. 36 wpi 80 of B128-inoculated mice were H. pylorinegative, and 50 wpi no B128-infection was dete.Pylori strain SS1 was provided by Prof. Steffen Backert (School of Biomolecular Biomedical Science, University College Dublin). For the infection, bacteria were harvested in BHI-medium.Experimental InfectionAnimals were divided in four groups: (A) sham inoculated wt mice; (B) H. pylori-infected wt- mice; (C) sham inoculated ctsz2/2 mice; and (D) H. pylori-infecetd wt- mice. At 8 weeks of age, wt and ctsz2/2 mice of both genders were orally infected with 108 cfu SS1 or B128 in 200 ml of BHI-medium or medium alone three times per week. For the infection of primary gastric epithelial cells,Cathepsin X and Premalignant Host ResponseQuantitative Real-time PCR AnalysisAssays were performed on the LightCyclerTM (Roche Diagnostics, Mannheim, Germany). Several dilutions of plasmids containing cDNA fragments of different genes were used as internal controls. For plasmid construction, the cDNA fragments were amplified using the following primers: H. pylori (F, 59 – CTG GAG AGA CTA AGC CCT CC ?9; R, 59 – ATT ACT GAC GCT GAT TGT GC -39) mIL-1b (F, 59-CAACCAACAAGTGATATTCTCCATG-39; R, 59-GATCCACACTCTCCAGCTGCA-39) mCxcl1/KC (F, 59-GCACCCAAACCGAAGTCATAGC-39; R, 59TTGTCAGAAGCCAGCGTTCACC-39), mMCP-1 (F, 59GCTCTCTCTTCCTCCACCACCAT-39; R, 59GCTCTCCAGCCTACTCATTGGGAT-39), mIL-6 (F, 5-CACAAAGCCAGAGTCCTTCAGAGA-39; R, 5CTAGGTTTGCCGAGTAGATCTC-39) and m-actin (F, 5CTGGGTCATTCTTTTCACGGT-39; R, 5-ACTGGGACGACATGGAGAAG-39). The same primers were used for qPCRreactions. PCR-products were inserted into the pCR2.1-TOPO vector (Invitrogen, Groningen, The Netherlands). The copy number of the resulting plasmids was calculated after DNA quantification. Using TriFastTM reagent (Peqlab), we extracted total RNA from tissue samples 1315463 according to the manufacturer`s instructions. RNA was reverse-transcribed using Transcriptor High Fidelity cDNA Kit (Roche). PCR-reactions were performed using the qPCR Mastermix kit (Quantace, London) according to the manufacturer`s instructions. The standard temperature profile included initial denaturation for 10 min at 95uC, followed by 35 cycles of denaturation at 95uC for 15 s, annealing at 52uC to 60uC (primer dependent) for 15 s, and extension at 72uC for 10 s. Mouse actin served as a housekeeping gene. The relative abundance (fold changes against uninfected controls) was calculated using the delta delta Ct method (22DDCt). All oligonucleotide primers were purchased from BioTez (Berlin, Germany). The PCR-products were analyzed on a 1.8 agarose gel and visualized by ethidium bromide staining.Statistical AnalysisData are expressed as Box plots or scatter plots (median values). GraphPad Prism software was used for statistical analysis. Statistical analyses were performed using the Mann-Whitney U test for unpaired groups. A p-value of 0.05 was set to be the level of significance. Systematic deviances between staining and quantitative PCR were tested using Bowker’s test. Furthermore, the level of agreement was evaluated using Cohen’s kappa. All tests were deliberately carried out to the full level of significance. Analyses were made using SPSS Statistics 19.0 (IBM Corporation, NY, USA).ResultsWt and ctsz2/2 mice were inoculated with either H. pylori SS1 or B128 strain (n = 49). According to the results of quantitative H. pylori-PCR and histological tests, at 12 weeks, almost all SS1inoculated (96 ), but only 50 of B128-inoculated mice were infected. 36 wpi 80 of B128-inoculated mice were H. pylorinegative, and 50 wpi no B128-infection was dete.
