|CHITKO MCKOWN, CAROL|
|Grosse, William - INDIANA UNIVERSITY|
Submitted to: Immunology Research Workshop
Publication Type: Abstract Only
Publication Acceptance Date: October 29, 2003
Publication Date: December 1, 2003
Citation: CHITKO MCKOWN, C.G., FOX, J.M., MILLER, L.C., HEATON, M.P., BONO, J.L., KEEN, J.E., GROSSE, W.M., LAEGREID, W.W. GENE EXPRESSION PROFILING OF BOVINE MACROPHAGES IN RESPONSE TO ESCHERICHIA COLI O157:H7 LIPOPOLYSACCHARIDE. IMMUNOLOGY RESEARCH WORKSHOP. 2003. ABSTRACT NO. 23. Technical Abstract: The aim of this study was to identify changes in bovine macrophage gene expression in response to treatment with Escherichia coli 0157:H7 lipopolysaccharide (LPS), utilizing a human gene microarray. Bovine cDNA from control and LPS-treated primary macrophages hybridized to greater than 5,644 (79.8%) of the non-control gene targets on a commercially available microarray containing greater than 7,075 targets (Incyte Genomics, St. Louis, MO). Of these target sequences, 44 were differentially expressed upon exposure to LPS, including 18 genes not previously reported to exist in cattle. These included a pentaxin-related gene, CASP8, TNF-induced genes, interferon-induced genes, and inhibitors of apoptosis. Using the human microarray, cDNA from bovine LPS-treated and control macrophages consistently hybridized to targets known to be expressed constitutively by macrophages, as expected given the predicted cDNA sequence homology. That this human system was accurately estimating levels of bovine transcripts was further verified by real-time quantitative reverse transcriptase polymerase chain reaction (RTQ-PCR) using bovine-specific primers. This first report of bovine-human cross-species expression profiling by microarray hybridization demonstrates the utility of this technique in bovine gene expression and discovery.