Elevated adaptive immune responses are associated with latent infections of Wuchereria bancrofti.
In order to guarantee the fulfillment of their complex lifecycle, adult filarial nematodes release millions of microfilariae (MF), which are taken up by mosquito vectors. The current strategy to eliminate lymphatic filariasis as a public health problem focuses upon interrupting this transmission thr...
| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2012-01-01
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| Series: | PLoS Neglected Tropical Diseases |
| Online Access: | https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22509424/pdf/?tool=EBI |
| _version_ | 1818426390534422528 |
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| author | Kathrin Arndts Susanne Deininger Sabine Specht Ute Klarmann Sabine Mand Tomabu Adjobimey Alexander Y Debrah Linda Batsa Alexander Kwarteng Christian Epp Mark Taylor Ohene Adjei Laura E Layland Achim Hoerauf |
| author_facet | Kathrin Arndts Susanne Deininger Sabine Specht Ute Klarmann Sabine Mand Tomabu Adjobimey Alexander Y Debrah Linda Batsa Alexander Kwarteng Christian Epp Mark Taylor Ohene Adjei Laura E Layland Achim Hoerauf |
| author_sort | Kathrin Arndts |
| collection | DOAJ |
| description | In order to guarantee the fulfillment of their complex lifecycle, adult filarial nematodes release millions of microfilariae (MF), which are taken up by mosquito vectors. The current strategy to eliminate lymphatic filariasis as a public health problem focuses upon interrupting this transmission through annual mass drug administration (MDA). It remains unclear however, how many rounds of MDA are required to achieve low enough levels of MF to cease transmission. Interestingly, with the development of further diagnostic tools a relatively neglected cohort of asymptomatic (non-lymphedema) amicrofilaremic (latent) individuals has become apparent. Indeed, epidemiological studies have suggested that there are equal numbers of patent (MF(+)) and latent individuals. Since the latter represent a roadblock for transmission, we studied differences in immune responses of infected asymptomatic male individuals (n = 159) presenting either patent (n = 92 MF(+)) or latent (n = 67 MF(-)) manifestations of Wuchereria bancrofti. These individuals were selected on the basis of MF, circulating filarial antigen in plasma and detectable worm nests. Immunological profiles of either Th1/Th17, Th2, regulatory or innate responses were determined after stimulation of freshly isolated PBMCs with either filarial-specific extract or bystander stimuli. In addition, levels of total and filarial-specific antibodies, both IgG subclasses and IgE, were ascertained from plasma. Results from these individuals were compared with those from 22 healthy volunteers from the same endemic area. Interestingly, we observed that in contrast to MF(+) patients, latent infected individuals had lower numbers of worm nests and increased adaptive immune responses including antigen-specific IL-5. These data highlight the immunosuppressive status of MF(+) individuals, regardless of age or clinical hydrocele and reveal immunological profiles associated with latency and immune-mediated suppression of parasite transmission. |
| first_indexed | 2024-12-14T14:29:04Z |
| format | Article |
| id | doaj.art-bd684710a4f14f0faa8e711efd0984e6 |
| institution | Directory Open Access Journal |
| issn | 1935-2727 1935-2735 |
| language | English |
| last_indexed | 2024-12-14T14:29:04Z |
| publishDate | 2012-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS Neglected Tropical Diseases |
| spelling | doaj.art-bd684710a4f14f0faa8e711efd0984e62022-12-21T22:57:51ZengPublic Library of Science (PLoS)PLoS Neglected Tropical Diseases1935-27271935-27352012-01-0164e161110.1371/journal.pntd.0001611Elevated adaptive immune responses are associated with latent infections of Wuchereria bancrofti.Kathrin ArndtsSusanne DeiningerSabine SpechtUte KlarmannSabine MandTomabu AdjobimeyAlexander Y DebrahLinda BatsaAlexander KwartengChristian EppMark TaylorOhene AdjeiLaura E LaylandAchim HoeraufIn order to guarantee the fulfillment of their complex lifecycle, adult filarial nematodes release millions of microfilariae (MF), which are taken up by mosquito vectors. The current strategy to eliminate lymphatic filariasis as a public health problem focuses upon interrupting this transmission through annual mass drug administration (MDA). It remains unclear however, how many rounds of MDA are required to achieve low enough levels of MF to cease transmission. Interestingly, with the development of further diagnostic tools a relatively neglected cohort of asymptomatic (non-lymphedema) amicrofilaremic (latent) individuals has become apparent. Indeed, epidemiological studies have suggested that there are equal numbers of patent (MF(+)) and latent individuals. Since the latter represent a roadblock for transmission, we studied differences in immune responses of infected asymptomatic male individuals (n = 159) presenting either patent (n = 92 MF(+)) or latent (n = 67 MF(-)) manifestations of Wuchereria bancrofti. These individuals were selected on the basis of MF, circulating filarial antigen in plasma and detectable worm nests. Immunological profiles of either Th1/Th17, Th2, regulatory or innate responses were determined after stimulation of freshly isolated PBMCs with either filarial-specific extract or bystander stimuli. In addition, levels of total and filarial-specific antibodies, both IgG subclasses and IgE, were ascertained from plasma. Results from these individuals were compared with those from 22 healthy volunteers from the same endemic area. Interestingly, we observed that in contrast to MF(+) patients, latent infected individuals had lower numbers of worm nests and increased adaptive immune responses including antigen-specific IL-5. These data highlight the immunosuppressive status of MF(+) individuals, regardless of age or clinical hydrocele and reveal immunological profiles associated with latency and immune-mediated suppression of parasite transmission.https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22509424/pdf/?tool=EBI |
| spellingShingle | Kathrin Arndts Susanne Deininger Sabine Specht Ute Klarmann Sabine Mand Tomabu Adjobimey Alexander Y Debrah Linda Batsa Alexander Kwarteng Christian Epp Mark Taylor Ohene Adjei Laura E Layland Achim Hoerauf Elevated adaptive immune responses are associated with latent infections of Wuchereria bancrofti. PLoS Neglected Tropical Diseases |
| title | Elevated adaptive immune responses are associated with latent infections of Wuchereria bancrofti. |
| title_full | Elevated adaptive immune responses are associated with latent infections of Wuchereria bancrofti. |
| title_fullStr | Elevated adaptive immune responses are associated with latent infections of Wuchereria bancrofti. |
| title_full_unstemmed | Elevated adaptive immune responses are associated with latent infections of Wuchereria bancrofti. |
| title_short | Elevated adaptive immune responses are associated with latent infections of Wuchereria bancrofti. |
| title_sort | elevated adaptive immune responses are associated with latent infections of wuchereria bancrofti |
| url | https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22509424/pdf/?tool=EBI |
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