The B cell adaptor molecule Bam32 is critically important for optimal antibody response and resistance to Trypanosoma congolense infection in mice.
BACKGROUND:Bam32, a 32 kDa adaptor molecule, plays important role in B cell receptor signalling, T cell receptor signalling and antibody affinity maturation in germinal centres. Since antibodies against trypanosome variant surface glycoproteins (VSG) are critically important for control of parasitem...
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ftdoajarticles:oai:doaj.org/article:e8ed02194b374b06ae610fcb26a22859 2023-05-15T15:14:39+02:00 The B cell adaptor molecule Bam32 is critically important for optimal antibody response and resistance to Trypanosoma congolense infection in mice. Chukwunonso Onyilagha Ping Jia Nipun Jayachandran Sen Hou Ifeoma Okwor Shiby Kuriakose Aaron Marshall Jude E Uzonna 2015-04-01T00:00:00Z https://doi.org/10.1371/journal.pntd.0003716 https://doaj.org/article/e8ed02194b374b06ae610fcb26a22859 EN eng Public Library of Science (PLoS) http://europepmc.org/articles/PMC4395458?pdf=render https://doaj.org/toc/1935-2727 https://doaj.org/toc/1935-2735 1935-2727 1935-2735 doi:10.1371/journal.pntd.0003716 https://doaj.org/article/e8ed02194b374b06ae610fcb26a22859 PLoS Neglected Tropical Diseases, Vol 9, Iss 4, p e0003716 (2015) Arctic medicine. Tropical medicine RC955-962 Public aspects of medicine RA1-1270 article 2015 ftdoajarticles https://doi.org/10.1371/journal.pntd.0003716 2023-01-08T01:24:30Z BACKGROUND:Bam32, a 32 kDa adaptor molecule, plays important role in B cell receptor signalling, T cell receptor signalling and antibody affinity maturation in germinal centres. Since antibodies against trypanosome variant surface glycoproteins (VSG) are critically important for control of parasitemia, we hypothesized that Bam32 deficient (Bam32-/-) mice would be susceptible to T. congolense infection. METHODOLOGY/PRINCIPAL FINDINGS:We found that T. congolense-infected Bam32-/- mice successfully control the first wave of parasitemia but then fail to control subsequent waves and ultimately succumb to their infection unlike wild type (WT) C57BL6 mice which are relatively resistant. Although infected Bam32-/- mice had significantly higher hepatomegaly and splenomegaly, their serum AST and ALT levels were not different, suggesting that increased liver pathology may not be responsible for the increased susceptibility of Bam32-/- mice to T. congolense. Using direct ex vivo flow cytometry and ELISA, we show that CD4+ T cells from infected Bam32-/- mice produced significantly increased amounts of disease-exacerbating proinflammatory cytokines (including IFN-γ, TNF-α and IL-6). However, the percentages of regulatory T cells and IL-10-producing CD4+ cells were similar in infected WT and Bam32-/- mice. While serum levels of parasite-specific IgM antibodies were normal, the levels of parasite-specific IgG, (particularly IgG1 and IgG2a) were significantly lower in Bam32-/- mice throughout infection. This was associated with impaired germinal centre response in Bam32-/- mice despite increased numbers of T follicular helper (Tfh) cells. Adoptive transfer studies indicate that intrinsic B cell defect was responsible for the enhanced susceptibility of Bam32-/- mice to T. congolense infection. CONCLUSIONS/SIGNIFICANCE:Collectively, our data show that Bam32 is important for optimal anti-trypanosome IgG antibody response and suppression of disease-promoting proinflammatory cytokines and its deficiency leads to inability to control ... Article in Journal/Newspaper Arctic Directory of Open Access Journals: DOAJ Articles Arctic PLOS Neglected Tropical Diseases 9 4 e0003716 |
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Arctic medicine. Tropical medicine RC955-962 Public aspects of medicine RA1-1270 |
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Arctic medicine. Tropical medicine RC955-962 Public aspects of medicine RA1-1270 Chukwunonso Onyilagha Ping Jia Nipun Jayachandran Sen Hou Ifeoma Okwor Shiby Kuriakose Aaron Marshall Jude E Uzonna The B cell adaptor molecule Bam32 is critically important for optimal antibody response and resistance to Trypanosoma congolense infection in mice. |
topic_facet |
Arctic medicine. Tropical medicine RC955-962 Public aspects of medicine RA1-1270 |
description |
BACKGROUND:Bam32, a 32 kDa adaptor molecule, plays important role in B cell receptor signalling, T cell receptor signalling and antibody affinity maturation in germinal centres. Since antibodies against trypanosome variant surface glycoproteins (VSG) are critically important for control of parasitemia, we hypothesized that Bam32 deficient (Bam32-/-) mice would be susceptible to T. congolense infection. METHODOLOGY/PRINCIPAL FINDINGS:We found that T. congolense-infected Bam32-/- mice successfully control the first wave of parasitemia but then fail to control subsequent waves and ultimately succumb to their infection unlike wild type (WT) C57BL6 mice which are relatively resistant. Although infected Bam32-/- mice had significantly higher hepatomegaly and splenomegaly, their serum AST and ALT levels were not different, suggesting that increased liver pathology may not be responsible for the increased susceptibility of Bam32-/- mice to T. congolense. Using direct ex vivo flow cytometry and ELISA, we show that CD4+ T cells from infected Bam32-/- mice produced significantly increased amounts of disease-exacerbating proinflammatory cytokines (including IFN-γ, TNF-α and IL-6). However, the percentages of regulatory T cells and IL-10-producing CD4+ cells were similar in infected WT and Bam32-/- mice. While serum levels of parasite-specific IgM antibodies were normal, the levels of parasite-specific IgG, (particularly IgG1 and IgG2a) were significantly lower in Bam32-/- mice throughout infection. This was associated with impaired germinal centre response in Bam32-/- mice despite increased numbers of T follicular helper (Tfh) cells. Adoptive transfer studies indicate that intrinsic B cell defect was responsible for the enhanced susceptibility of Bam32-/- mice to T. congolense infection. CONCLUSIONS/SIGNIFICANCE:Collectively, our data show that Bam32 is important for optimal anti-trypanosome IgG antibody response and suppression of disease-promoting proinflammatory cytokines and its deficiency leads to inability to control ... |
format |
Article in Journal/Newspaper |
author |
Chukwunonso Onyilagha Ping Jia Nipun Jayachandran Sen Hou Ifeoma Okwor Shiby Kuriakose Aaron Marshall Jude E Uzonna |
author_facet |
Chukwunonso Onyilagha Ping Jia Nipun Jayachandran Sen Hou Ifeoma Okwor Shiby Kuriakose Aaron Marshall Jude E Uzonna |
author_sort |
Chukwunonso Onyilagha |
title |
The B cell adaptor molecule Bam32 is critically important for optimal antibody response and resistance to Trypanosoma congolense infection in mice. |
title_short |
The B cell adaptor molecule Bam32 is critically important for optimal antibody response and resistance to Trypanosoma congolense infection in mice. |
title_full |
The B cell adaptor molecule Bam32 is critically important for optimal antibody response and resistance to Trypanosoma congolense infection in mice. |
title_fullStr |
The B cell adaptor molecule Bam32 is critically important for optimal antibody response and resistance to Trypanosoma congolense infection in mice. |
title_full_unstemmed |
The B cell adaptor molecule Bam32 is critically important for optimal antibody response and resistance to Trypanosoma congolense infection in mice. |
title_sort |
b cell adaptor molecule bam32 is critically important for optimal antibody response and resistance to trypanosoma congolense infection in mice. |
publisher |
Public Library of Science (PLoS) |
publishDate |
2015 |
url |
https://doi.org/10.1371/journal.pntd.0003716 https://doaj.org/article/e8ed02194b374b06ae610fcb26a22859 |
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Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
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Arctic |
op_source |
PLoS Neglected Tropical Diseases, Vol 9, Iss 4, p e0003716 (2015) |
op_relation |
http://europepmc.org/articles/PMC4395458?pdf=render https://doaj.org/toc/1935-2727 https://doaj.org/toc/1935-2735 1935-2727 1935-2735 doi:10.1371/journal.pntd.0003716 https://doaj.org/article/e8ed02194b374b06ae610fcb26a22859 |
op_doi |
https://doi.org/10.1371/journal.pntd.0003716 |
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PLOS Neglected Tropical Diseases |
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9 |
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4 |
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e0003716 |
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