| Autor: |
Anderton, Julie M., Tokarz, Rafal, Thill, Charles D., Kuhlow, Christopher J., Brooks, Chad S., Akins, Darrin R., Katona, Laura I., Benach, Jorge L. |
| Zdroj: |
Infection and Immunity; April 2004, Vol. 72 Issue: 4 p2035-2044, 10p |
| Abstrakt: |
ABSTRACTIdentification and characterization of genes that contribute to infection with Borrelia burgdorferiand, of those, genes that are targets of host responses is important for understanding the pathogenesis of Lyme disease. The complement-independent bactericidal monoclonal antibody (MAb) CB2 recognizes a carboxy-terminal, hydrophilic epitope of the outer surface protein B (OspB). CB2 kills B. burgdorferiby an unknown bactericidal mechanism. Upon binding of CB2 to OspB, differentially expressed gene products may be responsible for, or associated with, the death of the organism. A time course of the response of B. burgdorferito CB2 was completed to analyze the differential gene expression in the bacteria over a period of visual morphological changes. Bacteria were treated with a sublethal concentration in which spirochetes were visibly distressed by the antibody but not lysed. Preliminary whole-genome DNA arrays at various time points within 1 h of incubation of B. burgdorferiwith the antibody showed that most significant changes occurred at 25 min. Circular plasmid 32 (cp32)-encoded genes were active in this period of time, including the blyAhomologs, phage holin system genes. DNA array data show that three blyAhomologs were upregulated significantly, ≥2 standard deviations from the mean of the log ratios, and a Pvalue of ≤0.01. Quantitative real-time PCR analysis verified blyAand blyBupregulation over an 18- to 35-min time course. The hypothesis to test is whether the killing mechanism of CB2 is through uncontrolled expression of the blyAand blyBphage holin system. |
| Databáze: |
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