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Infect. Immun., 08 1997, 3107-3111, Vol 65, No. 8
I Kang, SW Barthold, DH Persing and LK Bockenstedt
Genetic susceptibility to murine Lyme arthritis has been correlated with
the dominance of T-helper (Th1)- or Th2-cell-associated cytokines. To
determine when commitment of the Th cell phenotype occurs, we examined the
kinetics of gamma interferon (IFN-gamma) and interleukin-4 (IL-4)
production by lymph node T cells of disease-susceptible C3H/HeN and
disease-resistant BALB/c mice from days 2 through 30 of infection, a period
encompassing the evolution of disease and early regression. BALB/c mice
produced more IFN-gamma on day 2 of infection than did C3H/HeN mice,
whereas IL-4 was first detected on day 14. In contrast, only IFN-gamma
could be detected in C3H/HeN mice, and the levels steadily increased from
day 2 to surpass those seen in BALB/c mice by day 14 of infection. Despite
the difference in cytokine profiles, both BALB/c and C3H/HeN mice developed
comparable arthritis assessed at 14 days of infection. Arthritis regressed
by day 30 in BALB/c mice but persisted in C3H/HeN mice. These studies are
the first to demonstrate that the Th2 response to Borrelia burgdorferi
infection of BALB/c mice is preceded by a Th1 cytokine response. Moreover,
the timing of the appearance of IL-4 suggests that its primary effect is
not in preventing disease, as suggested by others, but, rather, in
hastening the resolution of inflammation. The implications of these
findings for the orchestration of host defense against B. burgdorferi
infection are discussed.
Copyright © 1997, American Society for Microbiology
T-helper-cell cytokines in the early evolution of murine Lyme arthritis
Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut 06520, USA.
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