title: Influence of bacterial factors on proliferation of bovine mammary epithelial cells.
abstract: Effects of bovine mastitis pathogen virulence factors on mammary epithelial cell function are not clearly understood. In this study, the effect of streptococcal lipoteichoic acid (LTA), streptokinase, and Escherichia coli lipopolysaccharide (LPS) on proliferation of a primary bovine mammary epithelial cell culture (BTE) and on an established bovine mammary epithelial cell line (MAC-T) was evaluated. Mammary epithelial cells were cultured in the presence of bacterial virulence factors for 48 h at 37 degrees C. BTE cell proliferation was inhibited by streptococcal LTA at 8 and 16 micrograms/ml whereas MAC-T cell proliferation was reduced significantly by concentrations of LTA > or = 2 micrograms/ml. Streptokinase had no effect on proliferation of either MAC-T or BTE cells and LPS inhibited proliferation of BTE but not of MAC-T cells. Effect of LTA and LPS on mammary epithelial cell proliferation could be relevant during the periparturient period when mammary glands are markedly susceptible to new intramammary infection and when mammary epithelial cells undergo extensive proliferation, differentiation and synthesis of milk components.
authors.affiliation: Department of Animal Science, Institute of Agriculture, University of Tennessee, Knoxville, TN 37996, USA. calvinho@inta.gov.ar
authors.forename: L F
authors.initials: LF
authors.lastname: Calvinho
authors.forename: R A
authors.initials: RA
authors.lastname: Almeida
authors.forename: S P
authors.initials: SP
authors.lastname: Oliver
mesh_terms: D000818:Animals; D015415:Biomarkers; D002417:Cattle; D002455:Cell Division / Q000187:drug effects; D002461:Cell Line, Transformed; D002478:Cells, Cultured; D002999:Clone Cells; D004847:Epithelial Cells / Q000187:drug effects*; D004926:Escherichia coli / Q000472:pathogenicity*; D004927:Escherichia coli Infections / Q000382:microbiology / Q000662:veterinary; D005260:Female; D007124:Immunoenzyme Techniques; D007633:Keratins / Q000032:analysis; D008070:Lipopolysaccharides / Q000494:pharmacology / Q000633:toxicity*; D008321:Mammary Glands, Animal / Q000166:cytology*; D008414:Mastitis, Bovine / Q000382:microbiology*; D011247:Pregnancy; D013290:Streptococcal Infections / Q000382:microbiology / Q000662:veterinary; D013291:Streptococcus / Q000472:pathogenicity*; D013300:Streptokinase / Q000494:pharmacology*; D013682:Teichoic Acids / Q000494:pharmacology / Q000633:toxicity*; D014746:Vimentin / Q000032:analysis; D014774:Virulence
chemical_list: D015415:Biomarkers; D008070:Lipopolysaccharides; D013682:Teichoic Acids; D014746:Vimentin; C433788:lipopolysaccharide, E. coli O26-B6; C009900:lipoteichoic acid; D007633:Keratins; D013300:Streptokinase