Acquisition of growth-inhibitory antibodies against blood-stage Plasmodium falciparum.
BACKGROUND: Antibodies that inhibit the growth of blood-stage Plasmodium falciparum may play an important role in acquired and vaccine-induced immunity in humans. However, the acquisition and activity of these antibodies is not well understood. METHODS: We tested dialysed serum and purified immunog...
| Main Authors: | , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
2008
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| _version_ | 1826286795813289984 |
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| author | McCallum, F Persson, K Mugyenyi, C Fowkes, F Simpson, J Richards, J Williams, T Marsh, K Beeson, J |
| author_facet | McCallum, F Persson, K Mugyenyi, C Fowkes, F Simpson, J Richards, J Williams, T Marsh, K Beeson, J |
| author_sort | McCallum, F |
| collection | OXFORD |
| description | BACKGROUND: Antibodies that inhibit the growth of blood-stage Plasmodium falciparum may play an important role in acquired and vaccine-induced immunity in humans. However, the acquisition and activity of these antibodies is not well understood. METHODS: We tested dialysed serum and purified immunoglobulins from Kenyan children and adults for inhibition of P. falciparum blood-stage growth in vitro using different parasite lines. Serum antibodies were measured by ELISA to blood-stage parasite antigens, extracted from P. falciparum schizonts, and to recombinant merozoite surface protein 1 (42 kDa C-terminal fragment, MSP1-42). RESULTS: Antibodies to blood-stage antigens present in schizont protein extract and to recombinant MSP1-42 significantly increased with age and were highly correlated. In contrast, growth-inhibitory activity was not strongly associated with age and tended to decline marginally with increasing age and exposure, with young children demonstrating the highest inhibitory activity. Comparison of growth-inhibitory activity among samples collected from the same population at different time points suggested that malaria transmission intensity influenced the level of growth-inhibitory antibodies. Antibodies to recombinant MSP1-42 were not associated with growth inhibition and high immunoglobulin G levels were poorly predictive of inhibitory activity. The level of inhibitory activity against different isolates varied. CONCLUSIONS: Children can acquire growth-inhibitory antibodies at a young age, but once they are acquired they do not appear to be boosted by on-going exposure. Inhibitory antibodies may play a role in protection from early childhood malaria. |
| first_indexed | 2024-03-07T01:49:02Z |
| format | Journal article |
| id | oxford-uuid:996fa820-35a6-4e2d-a7ec-09a923c1579a |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T01:49:02Z |
| publishDate | 2008 |
| record_format | dspace |
| spelling | oxford-uuid:996fa820-35a6-4e2d-a7ec-09a923c1579a2022-03-27T00:14:18ZAcquisition of growth-inhibitory antibodies against blood-stage Plasmodium falciparum.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:996fa820-35a6-4e2d-a7ec-09a923c1579aEnglishSymplectic Elements at Oxford2008McCallum, FPersson, KMugyenyi, CFowkes, FSimpson, JRichards, JWilliams, TMarsh, KBeeson, J BACKGROUND: Antibodies that inhibit the growth of blood-stage Plasmodium falciparum may play an important role in acquired and vaccine-induced immunity in humans. However, the acquisition and activity of these antibodies is not well understood. METHODS: We tested dialysed serum and purified immunoglobulins from Kenyan children and adults for inhibition of P. falciparum blood-stage growth in vitro using different parasite lines. Serum antibodies were measured by ELISA to blood-stage parasite antigens, extracted from P. falciparum schizonts, and to recombinant merozoite surface protein 1 (42 kDa C-terminal fragment, MSP1-42). RESULTS: Antibodies to blood-stage antigens present in schizont protein extract and to recombinant MSP1-42 significantly increased with age and were highly correlated. In contrast, growth-inhibitory activity was not strongly associated with age and tended to decline marginally with increasing age and exposure, with young children demonstrating the highest inhibitory activity. Comparison of growth-inhibitory activity among samples collected from the same population at different time points suggested that malaria transmission intensity influenced the level of growth-inhibitory antibodies. Antibodies to recombinant MSP1-42 were not associated with growth inhibition and high immunoglobulin G levels were poorly predictive of inhibitory activity. The level of inhibitory activity against different isolates varied. CONCLUSIONS: Children can acquire growth-inhibitory antibodies at a young age, but once they are acquired they do not appear to be boosted by on-going exposure. Inhibitory antibodies may play a role in protection from early childhood malaria. |
| spellingShingle | McCallum, F Persson, K Mugyenyi, C Fowkes, F Simpson, J Richards, J Williams, T Marsh, K Beeson, J Acquisition of growth-inhibitory antibodies against blood-stage Plasmodium falciparum. |
| title | Acquisition of growth-inhibitory antibodies against blood-stage Plasmodium falciparum. |
| title_full | Acquisition of growth-inhibitory antibodies against blood-stage Plasmodium falciparum. |
| title_fullStr | Acquisition of growth-inhibitory antibodies against blood-stage Plasmodium falciparum. |
| title_full_unstemmed | Acquisition of growth-inhibitory antibodies against blood-stage Plasmodium falciparum. |
| title_short | Acquisition of growth-inhibitory antibodies against blood-stage Plasmodium falciparum. |
| title_sort | acquisition of growth inhibitory antibodies against blood stage plasmodium falciparum |
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