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Infection and Immunity, December 2003, p. 6943-6952, Vol. 71, No. 12
0019-9567/03/$08.00+0 DOI: 10.1128/IAI.71.12.6943-6952.2003
Copyright © 2003, American
Society for
Microbiology. All Rights Reserved.
Temporal Analysis of Borrelia burgdorferi Erp Protein Expression throughout the Mammal-Tick Infectious Cycle
Jennifer C. Miller,* Kate von Lackum, Kelly Babb, Jason D. McAlister, and Brian Stevenson
Department of Microbiology, Immunology, and Molecular Genetics, University of
Kentucky College of Medicine, Lexington, Kentucky 40536-0298
Received 26 June 2003/
Returned for modification 28 July 2003/
Accepted 2 September 2003
Previous
immunological studies indicated that the Lyme disease spirochete,
Borrelia burgdorferi, expresses Erp outer surface proteins
during mammalian infection. We conducted analyses of Erp expression
throughout the entire tick-mammal infectious cycle, which revealed that
the bacteria regulate Erp production in vivo. Bacteria within unfed
nymphal ticks expressed little to no Erp proteins. However, as infected
ticks fed on mice, B. burgdorferi increased production of Erp
proteins, with essentially all transmitted bacteria expressing these
proteins. Mice infected with B. burgdorferi mounted rapid IgM
responses to all tested Erp proteins, followed by strong immunoglobulin
G responses that generally increased in intensity throughout 11 months
of infection, suggesting continued exposure of Erp proteins to the host
immune system throughout chronic infection. As naive tick larvae
acquired B. burgdorferi by feeding on infected mice,
essentially all transmitted bacteria produced Erp proteins, also
suggestive of continual Erp expression during mammalian infection.
Shortly after the larvae acquired bacteria, Erp production was
drastically downregulated. The expression of Erp proteins on B.
burgdorferi throughout mammalian infection is consistent with
their hypothesized function as factor H-binding proteins that protect
the bacteria from host innate immune
responses.
* Corresponding author. Mailing address: Department of Microbiology, Immunology, and Molecular Genetics, University of Kentucky College of Medicine, MS 415 Chandler Medical Center, Lexington, KY 40536-0298. Phone: (859) 257-9305. Fax: (859) 257-8994. E-mail:
JCMILL4{at}uky.edu.
Editor:
F. C. Fang
Infection and Immunity, December 2003, p. 6943-6952, Vol. 71, No. 12
0019-9567/03/$08.00+0 DOI: 10.1128/IAI.71.12.6943-6952.2003
Copyright © 2003, American
Society for
Microbiology. All Rights Reserved.
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