Trypanosome-induced suppression of anti-parasite responses during experimental African trypanosomiasis.

Abstract:

:The effect of Trypanosoma brucei infections on parasite-specific antibody responses was examined by immunization of infected mice with radio-attenuated trypanosomes of a noncross-reacting clone. Antibody titers (total Ig) against variant surface antigen were determined by indirect immunofluorescence. The suppression resulting from acute infection was virtually complete, and is associated with the failure to control the first relapse variant of the acute clone. The suppression resulting from chronic infection was much less severe, and subsequently variant populations of the chronic clone are successfully controlled. Antibody collected 10 days after each of the first 3 peaks of parasitemia during chronic infection was titrated on the homologous parasite preparations isolated from each wave in individual mice. As the infection progressed, both IgG and IgM antibody responses to each successive wave declined However, the decline of IgG antibody was more rapid than IgM, so that by the third parasite wave the mice responding with predominantly, if not exclusively, low levels of IgM antibody. We conclude that the severity of trypanosome-induced suppression of the anti-parasite response and IgM response in particular, determines the course of infection by trypanosomes varying in virulence.

journal_name

Eur J Immunol

authors

Sacks DL,Askonas BA

doi

10.1002/eji.1830101216

subject

Has Abstract

pub_date

1980-12-01 00:00:00

pages

971-4

issue

12

eissn

0014-2980

issn

1521-4141

journal_volume

10

pub_type

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