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Proteases involved in mammary tissue damage during endotoxin-induced mastitis in dairy cows.
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During and after diapedesis, milk polymorphonu-clear neutrophils (PMN) release many proteases that have the potential of degrading extracellular matrix proteins and milk proteins. However, the kinetics of milk proteolysis during inflammation and the underlying mechanisms are poorly defined. The
Short communication: Protease activity measurement in milk as a diagnostic test for clinical mastitis in dairy cows.
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Due to the increasing use of automated milking systems, automated detection of clinical mastitis is becoming more important. Various in- or on-line diagnostic tests are in use, but generally suffer from false mastitis alerts. In this study, we explored a new diagnostic approach based on measurement
Cysteine protease in bovine milk capable of hydrolyzing casein as the substrate and elevation of the activity during the course of mastitis.
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Cysteine protease was found to be present in bovine milk that catalyzed casein as the substrate. The protease was activated by reducing agents such as 2-mercaptoethanol and inhibited by monoiodoacetic acid, but not affected by the addition of phenylmethylsulfonyl fluoride, calcium or ethylene glycol
Mastitomics, the integrated omics of bovine milk in an experimental model of Streptococcus uberis mastitis: 3. Untargeted metabolomics.
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Intramammary infection leading to bovine mastitis is the leading disease problem affecting dairy cows and has marked effects on the milk produced by infected udder quarters. An experimental model of Streptococcus uberis mastitis has previously been investigated for clinical, immunological and
Virulence gene profiles in Staphylococcus aureus isolated from cows with subclinical mastitis in eastern Poland.
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Staphylococcus aureus is arguably the most important pathogen involved in bovine mastitis. The aim of this study was to determine the virulence gene profiles of 124 Staph. aureus isolates from subclinical mastitis in cows in eastern Poland. The presence of 30 virulence genes encoding adhesins,
Mastitis and immunological factors in breast milk of human immunodeficiency virus-infected women.
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Human milk contains important immunological factors that protect the breast from infection and are thought to protect infants from infection, including human immunodeficiency virus (HIV) infection. Human milk immunological factors have not been well characterized in HIV-infected lactating women.
Characterization and proteolytic origins of specific peptides appearing during lipopolysaccharide experimental mastitis.
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Based on the compositional change of the proteose peptone fraction, proteolysis was studied over time following lipopolysaccharide-induced experimental mastitis. Electrophoresis of the proteose peptone fraction revealed many degradation products. Five peptides were identified by amino-terminal
Tailor made plasmin substrates as potential diagnostic tool to test for mastitis.
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Plasmin is a protease in milk, which concentration is increased during mastitis. The aim of the study was design and characterize short, tailor made fluorogenic substrates for plasmin to see differences in plasmin activity in healthy milk compared to mastitic milk. According to the specificity
Specific agglutination of Streptococcus agalactiae from bovine mastitis by casein components of bovine milk.
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Streptococcus agalactiae strains freshly isolated from bovine mastitis cases clumped within 15 min of addition of small amounts of bovine milk to a broth culture. This reaction was not observed with isolates from human infections or bovine strains that had been maintained in the laboratory for
Short communication: can the mammopathogenic Escherichia coli P4 strain have a direct role on the caseinolysis of milk observed during bovine mastitis?
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During bacterial bovine mastitis, the quality of milk is altered because of caseinolysis. Endogenous potential actors in milk responsible for this caseinolysis have been well studied, unlike the exogenous bacterial ones. The aim of this study was to evaluate the direct role in caseinolysis of a
[Coagulase-negative staphylococci isolated from the milk of cows with subclinical mastitis].
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Studied were a total of 450 strains of coagulase-negative staphylococci, 60.2 per cent of which were sensitive to novobiocin, and 37.1 per cent were producing delta toxin, 35.2 per cent were yielding lysosime, and 27.8 per cent - fibrinolysin. As compared to staphylococci isolated from normal cows
The exon 29 c.3535A>T in the alpha-2-macroglobulin gene causing aberrant splice variants is associated with mastitis in dairy cattle.
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Alpha-2-macroglobulin (A2M) binds proteases, thereby acting as defense barriers against pathogens in the plasma and tissues of vertebrates and invertebrates. Quantitative real-time polymerase chain reaction (PCR) and the isobaric tags for relative and absolute quantitation method were used to
Influence of bovine mastitis on lipolysis ond proteolysis in milk.
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Lipolysis and proteolysis in milk were determined before, during, and after experimentally induced mastitis. Streptococcus agalactiae was infused into one quarter of five cows to elicit an infection. Milk protease activity was higher during infection, but milk lipase activity was unchanged.
A simple identification scheme for coagulase negative staphylococci from bovine mastitis.
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Coagulase-negative staphylococci from cases of bovine mastitis were identified to species level by using an identification scheme based on a three-plate test system which tested for DNase on DNA agar, for protease on calcium caseinate agar, and for the organism's sensitivity to novobiocin,
Cytotoxic activity of coagulase-negative staphylococci in bovine mastitis.
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Secreted toxins play important roles in the pathogenesis of bacterial infections. In this study, we examined the presence of secreted cytotoxic factors of coagulase-negative staphylococci (CoNS) from bovine clinical and subclinical mastitis. A 34- to 36-kDa protein with cell-rounding cytotoxic
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