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Invasive potential of bacterial isolates associated with subclinical bovine mastitis

José L Anaya-López1, Oscar E Contreras-Guzmán, Alfonso Cárabez-Trejo

  • 1Centro Multidisciplinario de Estudios en Biotecnología, Facultad de Medicina Veterinaria y Zootecnia, Universidad Michoacana de San Nicolás de Hidalgo, Apartado Postal 53, Administración Chapultepec Oriente, C.P. 58262 Morelia, Michoacán, México.

Research in Veterinary Science
|April 21, 2006
PubMed

Insights

Bacterial invasion of bovine mammary epithelial cells (BMEC) varies among mastitis isolates. This study identified specific Staphylococcus species capable of invading BMEC, highlighting differences in virulence factors.

Area of Science:

  • Veterinary Microbiology
  • Bacterial Pathogenesis
  • Dairy Science

Background:

  • Mastitis is a significant disease in dairy cows, impacting milk production and quality.
  • Bacterial invasion of mammary epithelial cells is a key factor in mastitis pathogenesis.
  • Understanding bacterial virulence factors is crucial for developing effective control strategies.

Purpose of the Study:

  • To investigate and compare the invasive capabilities of various bacterial isolates from bovine mastitis.
  • To assess the ability of different Staphylococcus species and Brevibacterium stationis to invade bovine mammary epithelial cells (BMEC) in vitro.
  • To identify potential differences in invasion potential among mastitis-associated bacteria.

Main Methods:

  • Isolation and characterization of bovine mammary epithelial cells (BMEC) from healthy lactating cows.
  • Culturing and identification of ten bacterial isolates from raw milk of backyard farm cows with mastitis.
  • In vitro invasion assay using BMEC to determine bacterial uptake and survival rates for each isolate.
  • Comparison of invasion levels against a known Staphylococcus aureus control strain (ATCC 27543).

Main Results:

  • Only specific isolates of Staphylococcus aureus (2) and Staphylococcus epidermidis (1) demonstrated the ability to invade BMEC.
  • The invasion levels by these successful isolates were comparable to the S. aureus control strain.
  • Most tested bacterial isolates, including Staphylococcus haemolyticus, Staphylococcus equorum, Staphylococcus xylosus, and Brevibacterium stationis, did not show significant invasion capabilities in this model.

Conclusions:

  • Significant differences exist in the invasive potential of bacterial isolates associated with bovine mastitis.
  • The in vitro BMEC invasion model effectively differentiates bacterial strains based on their ability to penetrate host cells.
  • Further research into the specific virulence factors mediating invasion by S. aureus and S. epidermidis is warranted.

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