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Infect. Immun., Aug 1997, 3100-3106, Vol 65, No. 8
N Zeidner, ML Mbow, M Dolan, R Massung, E Baca and J Piesman
Previous studies have demonstrated that both Ixodes scapularis saliva and
Borrelia burgdorferi antigens modulated lymphokines and monokines in vitro.
The studies presented here were designed to delineate the role of I.
scapularis and B. burgdorferi in modulation of the host immune response in
vivo. Infestation of C3H/HeJ mice with infected I. scapularis resulted in
an up regulation of IL-4 as early as 8 days after tick infestation, while
the levels of T helper cell type 1 (TH1) cytokines, interleukin-2 (IL-2)
and gamma interferon (IFN-gamma), were significantly decreased by days 10
to 12. In contrast, the cytokine profile of BALB/c mice exposed to infected
nymphal ticks resulted in only transient alterations in IL-4, IL-2, and
IFN-gamma production throughout a 12-day period postinfestation. Although
the IL-10 level was elevated in both C3H/HeJ and BALB/c mice infested with
infected nymphal ticks, no significant difference in the levels of IL-10
was noted between the mouse strains. Flow-cytometric analysis demonstrated
increases in the numbers of splenic B-cell and CD4+ lymphocytes in C3H/HeJ
but not BALB/c mice exposed to infected ticks. Cell depletion experiments
with C3H/HeJ mice demonstrated that CD4+ cells were the sole producers of
IFN-gamma and IL-10 while both CD4+ and CD8+ splenocytes contributed to the
production of IL-2 and IL-4. These findings suggest that B and CD4+
splenocytes are activated, increase in number, and produce a polarized TH2
response in C3H/HeJ mice exposed to infected I. scapularis. Given that
C3H/HeJ mice are susceptible to Lyme disease and the initial TH2
polarization is not evident in BALB/c mice, effective control of this
response may have ramifications for spirochete transmission in vivo.
Copyright © 1997, American Society for Microbiology
Effects of Ixodes scapularis and Borrelia burgdorferi on modulation of the host immune response: induction of a TH2 cytokine response in Lyme disease-susceptible (C3H/HeJ) mice but not in disease-resistant (BALB/c) mice
Division of Vector-Borne Infectious Diseases, Centers for Disease Control and Prevention, Fort Collins, Colorado 80522, USA.
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