title: Meta-Analysis of Transcriptional Responses to Mastitis-Causing Escherichia coli.
abstract: Bovine mastitis is a widespread disease in dairy cows, and is often caused by bacterial mammary gland infection. Mastitis causes reduced milk production and leads to excessive use of antibiotics. We present meta-analysis of transcriptional profiles of bovine mastitis from 10 studies and 307 microarrays, allowing identification of much larger sets of affected genes than any individual study. Combining multiple studies provides insight into the molecular effects of Escherichia coli infection in vivo and uncovers differences between the consequences of E. coli vs. Staphylococcus aureus infection of primary mammary epithelial cells (PMECs). In udders, live E. coli elicits inflammatory and immune defenses through numerous cytokines and chemokines. Importantly, E. coli infection causes downregulation of genes encoding lipid biosynthesis enzymes that are involved in milk production. Additionally, host metabolism is generally suppressed. Finally, defensins and bacteria-recognition genes are upregulated, while the expression of the extracellular matrix protein transcripts is silenced. In PMECs, heat-inactivated E. coli elicits expression of ribosomal, cytoskeletal and angiogenic signaling genes, and causes suppression of the cell cycle and energy production genes. We hypothesize that heat-inactivated E. coli may have prophylactic effects against mastitis. Heat-inactivated S. aureus promotes stronger inflammatory and immune defenses than E. coli. Lipopolysaccharide by itself induces MHC antigen presentation components, an effect not seen in response to E. coli bacteria. These results provide the basis for strategies to prevent and treat mastitis and may lead to the reduction in the use of antibiotics.
authors.affiliation: The R. O. Perelman Department of Dermatology, Department of Biochemistry and Molecular Pharmacology, NYU Langone Medical Center, New York, United States of America.|Department of Biochemistry, Quaid-i-Azam University, Islamabad, Pakistan.
authors.forename: Sidra
authors.initials: S
authors.lastname: Younis
authors.affiliation: Department of Biochemistry, Quaid-i-Azam University, Islamabad, Pakistan.
authors.forename: Qamar
authors.initials: Q
authors.lastname: Javed
authors.affiliation: The R. O. Perelman Department of Dermatology, Department of Biochemistry and Molecular Pharmacology, NYU Langone Medical Center, New York, United States of America.
authors.forename: Miroslav
authors.initials: M
authors.lastname: Blumenberg
mesh_terms: D000818:Animals; D002417:Cattle / Q000235:genetics* / Q000382:microbiology*; D002478:Cells, Cultured; D004926:Escherichia coli / Q000502:physiology*; D004927:Escherichia coli Infections / Q000150:complications / Q000235:genetics / Q000662:veterinary*; D005260:Female; D020869:Gene Expression Profiling; D063990:Gene Ontology; D008321:Mammary Glands, Animal / Q000378:metabolism / Q000382:microbiology*; D008414:Mastitis, Bovine / Q000235:genetics* / Q000382:microbiology; D013203:Staphylococcal Infections / Q000150:complications / Q000235:genetics / Q000662:veterinary; D013211:Staphylococcus aureus / Q000502:physiology; D059467:Transcriptome