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Abstract:
Studies were performed to characterize the effects of ureaplasmas in HeLa, 3T6, and CV-1 cell cultures. The ureaplasmas studied were human Ureaplasma urealyticum T960 (serotype VIII), bovine U. diversum T95, simian strain T167-2, ovine strain 1202, canine strain D1M-C, and feline strains 382 and FT2-B. FT2-B was the only ureaplasma to grow in the cell free culture medium, Dulbecco modified Eagle-Earle medium containing 10% fetal bovine serum. The growth pattern of the ureaplasmas varied in the different cell cultures, but each strain grew in at least two of the cell cultures, suggesting a requirement for a product of the cell culture and for low concentrations of urea. When growth occurred, organisms grew to concentrations that approached, but did not equal, those observed in 10B broth. Most, but not all, ureaplasmas grew quickly, reaching peak titers 2 days after infection. Canine strain D1M-C did not grow in 3T6, but showed rapid growth in HeLa and CV-1 cells, killing both cultures, In some systems, e.g., U. urealyticum T960 and simian strain T167-2, the infection persisted, and ureaplasmas could be recovered from cell cultures four passages after infection, when studies were terminated. The cell culture ureaplasmas grew on T agar, but not on mycoplasma agar medium.
Insights
Ureaplasmas exhibit varied growth patterns in different cell cultures, with some strains persisting post-infection. These findings offer insights into ureaplasma-host cell interactions and culture requirements.
Area of Science:
- Microbiology
- Cell Biology
- Infectious Diseases
Background:
- Ureaplasmas are bacteria known to colonize various hosts.
- Understanding their interaction with host cells is crucial for studying infections.
Purpose of the Study:
- To characterize the growth and effects of diverse ureaplasma strains in mammalian cell cultures.
- To identify specific growth requirements and host cell interactions of ureaplasmas.
Main Methods:
- Infection of HeLa, 3T6, and CV-1 cell cultures with multiple ureaplasma strains (human, bovine, simian, ovine, canine, feline).
- Monitoring ureaplasma growth, persistence, and effects on cell cultures.
- Testing ureaplasma growth on different agar media.
Main Results:
- Only one feline strain (FT2-B) grew in cell-free medium; other strains required cell culture components and low urea concentrations.
- Growth patterns varied, but most strains grew in at least two cell types, reaching significant titers.
- Canine strain D1M-C was cytotoxic to HeLa and CV-1 cells, while some infections persisted for multiple cell passages.
- Ureaplasmas grew on T agar but not on mycoplasma agar.
Conclusions:
- Ureaplasma growth in cell culture is dependent on specific cellular products and urea levels.
- Different ureaplasma strains display distinct host cell tropisms and pathogenic potentials.
- Persistence of ureaplasma infection in cell cultures suggests complex host-pathogen interactions.