The arachidonic acid metabolism protein-protein interaction network and its expression pattern in esophageal diseases.

Arachidonic acid (AA) and its metabolites are involved in the development and progression of inflammation and tumors in various tissues. We investigated the protein-protein interaction network (PPIN) of key enzymes in AA metabolism and their interacting proteins, as well as their expression patterns in different types of esophageal disease, involving esophagitis, Barrett's esophagus, adenocarcinoma and squamous cell carcinoma. PPINs were constructed to illustrate the key enzymes and their interacting proteins along the metabolic cascade. The network also showed key enzymes that could connect or cross-talk with at least one partner protein. The inflammation-related gene RELA (NF-kB) was found to interact with both PLA2G4A and ALOX5. Expression levels of the PPIN proteins, as well as their expression correlations, in different esophageal diseases were analyzed and integrated into the PPIN to illustrate a dynamic change. At least six significant pairs of expression relationships were identified across different esophageal diseases. The expression levels of eight enzymes (ALOX5, ALOX5AP, CYP2C8, CYP4F11, LTA4H, PLA2G4A, CYP2D6, PTGES2) correlated with the survival time of ESCC patients. In summary, we constructed an AA metabolic PPIN to explore AA metabolism-related gene expression patterns in esophageal diseases, showing their dynamic change and potential for therapeutic targeting from inflammation to cancer.