Role of serum in survival ofTreponema pallidum in tissue culture |
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Authors: | A Howard Fieldsteel James G Stout Frances A Becker |
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Institution: | (1) Life Sciences Division, SRI International, 94025 Menlo Park, California;(2) Present address: Syntex Research, 94043 Palo Alto, CA |
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Abstract: | Summary During attempts to cultivateTreponema pallidum, it was determined that length of time for survival of virulent treponemes was highly dependent on the quality of the fetal
bovine serum (FBS) used as a protein supplement in the culture medium. Eighteen lots of commercial FBS were tested for their
ability to maintain survival ofT. pallidum in cultures of cottontail rabbit epithelial (SflEp) cells. All were capable of supporting growth of these cells. However,
in tests on five of the lots, attachment of treponemes to the SflEp cells was either extremely poor or the 50% survival time
(ST50) was less than 5 days. With two of these lots, no treponemes survived for 5 days. By contrast, in tests with 11 of the FBS
lots, the ST50 of the treponemes was 12 days or greater; however, there was a great variation in the number of treponemes that attached.
Selection of lots of FBS for ultimate experimental use was based on their influence both to extend length of time for survival
of treponemes and to increase the number of treponemes that attached to the SflEp cells during that period. |
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Keywords: | Treponema pallidum fetal bovine serum SflEp cells |
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