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A defined medium for a fastidious Spiroplasma.

K J Hackett, A S Ginsberg, S Rottem

    Science (New York, N.Y.)
    |July 31, 1987
    PubMed
    Summary
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    Researchers developed a new medium (H-1) to grow Spiroplasma mirum, a bacteria causing cataracts and brain infections in mice. They discovered sphingomyelin is crucial for its in vitro growth, potentially explaining its effects on mouse tissues.

    Area of Science:

    • Microbiology
    • Infectious Diseases
    • Animal Models

    Background:

    • Spiroplasma mirum is a fastidious Mollicutes species.
    • It causes cataracts and chronic brain infections in neonate mice.
    • Cultivation of S. mirum in vitro has been challenging.

    Purpose of the Study:

    • To develop a defined medium for Spiroplasma mirum cultivation.
    • To investigate the nutritional requirements of S. mirum.
    • To understand the role of sphingomyelin in S. mirum growth and pathogenesis.

    Main Methods:

    • Development of a defined liquid medium (H-1).
    • Cultivation of Spiroplasma mirum in the H-1 medium.
    • In vitro experiments to assess growth factor requirements.

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  • Correlation of in vitro findings with in vivo observations.

    • Main Results:

    • A defined medium (H-1) was successfully developed for S. mirum.
    • Sphingomyelin was identified as an essential growth factor for S. mirum in vitro.
    • The dependency on sphingomyelin may explain S. mirum's tropism for sphingomyelin-rich tissues.

    Conclusions:

    • The H-1 medium facilitates the study of Spiroplasma mirum.
    • Sphingomyelin is a critical nutrient for Spiroplasma mirum growth.
    • This finding provides insights into the pathogenesis of S. mirum infections.