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AOM/DSS colorectal cancer mouse transcriptome profile across 5 time point in the progression of colites to tumor [RNA-seq]

ABSTRACT: Azoxymethane (AOM) and dextran sulfate sodium (DSS) mice, as a classic model for the study of colorectal cancer, can completely simulate the inflammatory cancer transformation in the development of colorectal cancer.Although people have been trying to reveal the key mechanism of colorectal cancer transformation. But the current understanding of it is still not enough. In this study, we injected mice with AOM and then periodically treated them with DSS. The mice were made to develop tumors in the colon finally. In this process, we sampled the intestinal tissues of the mice at different time points, respectively, at the 0th week, 2nd week, 4th week, 7th week and 10th week after AOM injection. to describe the gene exprression profile across all time point, we get the RNA-seq data for all samples.

ORGANISM(S): Mus musculus

PROVIDER: GSE178145 | GEO | 2022/06/14

REPOSITORIES: GEO

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Project description:Purpose: Next-generation sequencing (NGS) has revolutionized systems-based analysis of cellular pathways. The goals of this study are using transcriptome profiling (RNA-seq) to evaluate the effects of anti-S100a9 antibody on the global transcriptome of the colon tissues of the AOM/DSS mouse model (a model that mimics the human colitis-associated colon cancer development). Methods: 36 five-week-old male ICR mice were randomized divided into three groups: control (i.e. no AOM/DSS and antibody treatment), AOM/DSS+IgG Ab (1.5 mg/kg), and AOM/DSS+anti-S100a9 Ab (1.5 mg/kg). Mice were intraperitoneal injected with a single dose of 10 mg/kg azoxymethane (AOM) (A5486; Sigma) on day 1. One week after the AOM injection, mice were given three cycles of DSS (cycle 1: 2%, 7 days; cycle 2: 1.5%, 5 days; and cycle 3: 1.5%, 5 days, DSS: 36–50 kDa; MP Biomedicals, CA, USA) in their drinking water, and then distilled water until the end of the experiment. Antibodies were administrated intravenously every two days during the three cycles of DSS treatment. Mice were sequentially killed randomly at the end of the 18th week, and at least five mice were killed for each group at each time point. RNAs were extracted by Trizol and sequenced by Solexa high-throughput sequencing service (Oebiotech, Shanghai, China). Data were extracted and normalized according to the manufacturer’s standard protocol.Each group has three mices' colon tissues be tested. Results: Log-fold changes of up- or down-regulated mRNAs between the control and experiment group were selected with a significance threshold of p<0.05. There are 1017 mRNAs were up-regulated and 815 were down-regulated in “AOM/DSS+IgG Ab" group comparing to “control" group. There are 385 mRNAs were up-regulated and 163 were down-regulated in “AOM/DSS+anti-S100a9 Ab" group comparing to “control" group. There are 1314 mRNAs were up-regulated and 968 were down-regulated in “AOM/DSS+anti-S100a9 Ab" group comparing to “AOM/DSS+IgG Ab". Conclusions: Our study describes the global transciptome changes of colon tissues of the AOM/DSS mouse model induced by anti-S100a9 antibody treatment.

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AOM/DSS colorectal cancer mouse transcriptome profile across 5 time point in the progression of colites to tumor [RNA-seq]

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