Understanding the pathogenic mechanisms of subspecies (MAP) and the host responses to Johne's disease is complicated by the multi-faceted disease progression, late-onset host reaction and the lack of available infection models. We describe a novel cell culture passage model that mimics the course of infection The developed model simulates the interaction of MAP with the intestinal epithelial cells, followed by infection of macrophages and return to the intestinal epithelium. MAP internalization triggers a minimal inflammatory response. After passage through a macrophage phase, bacterial reinfection of MDBK epithelial cells, representing the late phase of intestinal mucosal infection, is associated with increased synthesis of the pro-inflammatory transcripts of IL-6, CCL5, IL-8 and IL-18, paired with decreased levels of TGFβ. Transcriptome analysis of MAP from each stage of epithelial cell infection identified increased expression of lipid biosynthesis and lipopeptide modification genes in the inflammatory phenotype of MAP. Total lipid analysis by HPLC-ES/MS indicates different lipidomic profiles between the two phenotypes and a unique set of lipids composing the inflammatory MAP phenotype. The presence of selected upregulated lipid-modification gene transcripts in samples of ileal tissue from cows diagnosed with Johne's disease supports and validates the model. By using the relatively simple cell culture passage model, we show that MAP alters its lipid composition during intracellular infection and acquires a pro-inflammatory phenotype, which likely is associated with the inflammatory phase of Johne's disease.


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