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Adult and microfilarial stages of the filarial parasite Brugia malayi stimulate contrasting cytokine and Ig isotype responses in BALB/c mice.

R A Lawrence, J E Allen, J Osborne and R M Maizels
J Immunol August 1, 1994, 153 (3) 1216-1224;
R A Lawrence
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J E Allen
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J Osborne
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R M Maizels
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Abstract

Natural infection with filarial nematode parasites shows many characteristics of a Th2 immune response. In these infections, long-lived adult worms inhabit the lymphatics, releasing laval microfilariae (Mf) into the blood stream. To compare the effect of these different developmental stages on the mammalian immune system, Mf and adult worms of either sex were implanted into BALB/c mice, in which they survive for at least 28 days. Serum Ab responses showed that whereas Mf stimulated specific Abs of all IgG subclasses, but little total IgE, adult worms stimulated only IgG1 and IgE responses. Splenocytes from implanted mice were stimulated in vitro with specific Ag or Con A and assayed for proliferation and profiles of cytokine secretion. Cells from Mf-infected mice secreted high levels of IFN-gamma (30 U/ml) throughout infection, but very little IL-4 at the early time points. By day 28 postinfection, however, splenocytes from Mf-infected mice showed some IL-4 secretion in response to specific Ag (40 U/ml). The IFN-gamma response to Mf was found to be independent of the inoculum dose in the range of 10(2) to 10(6) organisms. In contrast, splenocytes taken from adult worm-implanted mice on days 14, 21, and 28 postinfection produced high levels of IL-4 (up to 435 U/ml) and negligible amounts of IFN-gamma despite the production of large numbers of Mf by adult female worms. CD4+ cells were primarily responsible for this IL-4 production. These results demonstrate that adult filarial parasites, and females in particular, exert a rapid polarization of the immune response in a Th2-like direction, but that this effect may be modulated by the Mf stage.

  • Copyright © 1994 by American Association of Immunologists

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The Journal of Immunology
Vol. 153, Issue 3
1 Aug 1994
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Adult and microfilarial stages of the filarial parasite Brugia malayi stimulate contrasting cytokine and Ig isotype responses in BALB/c mice.
R A Lawrence, J E Allen, J Osborne, R M Maizels
The Journal of Immunology August 1, 1994, 153 (3) 1216-1224;

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Adult and microfilarial stages of the filarial parasite Brugia malayi stimulate contrasting cytokine and Ig isotype responses in BALB/c mice.
R A Lawrence, J E Allen, J Osborne, R M Maizels
The Journal of Immunology August 1, 1994, 153 (3) 1216-1224;
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Print ISSN 0022-1767        Online ISSN 1550-6606