Background: Gut uses variety of pathways to establish closely contact with obesity and obesity related diabetes, including gut-brain cross-talk, gut microbiota, immune pathway and gastrointestinal hormones. In this study, we aimed to identify the key pathways and genes of gastric mucosa in obesity patients with or without type 2 diabetes.

Methods: Our study was divided into three groups, healthy control group with normal BMI, patients with simple obesity(OB) and obesity with type 2 diabetes mellitus(OD), three cases in each groups. Gastric mucosal tissues were isolated then analyzed by gene microarray. The differentially expressed genes were screened by functional enrichment analysis and pathway analysis.

Results: 262 up-regulated genes and 265 down-regulated genes were differentially expressed between OB and normal-BMI patients. Besides, 1756 up-regulated genes and 1053 down-regulated genes were differentially expressed between OD and control subjects (fold change>2 p < 0.05). For DEGs comparisons in each group, 13 genes were co-up regulated, 10 genes were co-down regulated, and an additional 12 genes showed different trends. After analyzing the biological process and molecule function of differential expression genes, these genes were found to play crucial roles mainly in cellular metabolic, protein binding and other biological process. The analysis of KEGG showed that the relevant genes participate in Citrate cycle, NF-kappa B and PI3K-Akt signaling pathway.

Conclusions: During the process of obesity and obesity related diabetes, in gut there is not only one specific gene or pathway, but multiple genes and pathways that change. The effects of genes expressed in gastric mucosa mainly influence cellular metabolic processes, NF-kappa B and other proinflammatory signaling pathway.


X. Wen: None. Y. Zhang: None. R.J. Wu: None. C. Zhu: None. R. Cui: None. Y. Hui: None. F.Y. Mei: None. J. Gao: None. S. Qu: None. L. Bu: None.

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