Strongyloides stercoralis infection in marmosets: replication of complicated and uncomplicated human disease and parasite biology
Abstract Background Strongyloides stercoralis can undergo an alternative autoinfective life cycle in the host, which, in some individuals can lead to a lethal infection. However, due to a number of factors, such as, the majority of those infected are from low-income backgrounds and the limitation in...
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| Format: | Article |
| Language: | English |
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BMC
2014-12-01
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| Series: | Parasites & Vectors |
| Subjects: | |
| Online Access: | https://doi.org/10.1186/s13071-014-0579-2 |
| _version_ | 1797811724185763840 |
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| author | Vitor Luís Tenório Mati Pedro Raso Alan Lane de Melo |
| author_facet | Vitor Luís Tenório Mati Pedro Raso Alan Lane de Melo |
| author_sort | Vitor Luís Tenório Mati |
| collection | DOAJ |
| description | Abstract Background Strongyloides stercoralis can undergo an alternative autoinfective life cycle in the host, which, in some individuals can lead to a lethal infection. However, due to a number of factors, such as, the majority of those infected are from low-income backgrounds and the limitation in experimental models for studying human S. stercoralis, strongyloidiasis remains neglected. Improved knowledge of animal models that are susceptible to this parasite is needed in order to investigate the immunological mechanisms involved during infection and in particular to further understand the natural history of the autoinfective cycle. Methods Callithrix penicillata were inoculated subcutaneously with 100 (n = 2), 300 (n = 4) or 500 (n = 9) third-stage infective larvae (L3i) of S. stercoralis of human origin. Three marmosets received smaller inocula (i.e., one received 100 and two received 300 L3i) to ensure a greater capacity to withstand the infection after immunosuppression, which was triggered by administration of dexamethasone during early patency. Qualitative faecal analyses began at 7 days post-infection (DPI), and semi-quantitative tests were also performed for the dexamethasone-treated primates and the three matched controls. During the necropsies, specimens of S. stercoralis were recovered and tissue fragments were processed for histopathology. Results The mean prepatency and patency periods were 16.1 ± 3.0 and 161.1 ± 72.2 DPI, respectively. The marmosets typically tolerated the infection well, but immunosuppressed individuals exhibited higher numbers of larvae in the faeces and progressive clinical deterioration with late disseminated infection. In these cases, the number of females recovered was significantly higher than the number of inoculated L3i. Large quantities of larvae were observed migrating through the host tissues, and histopathology revealed pulmonary and intestinal injuries consistent with those observed in human strongyloidiasis. Conclusions Both complicated and uncomplicated strongyloidiasis occur in C. penicillata that is described as a susceptible small non-human primate model for S. stercoralis. This host permits the maintenance of a human strain of the parasite in the laboratory and can be useful for experimental investigations of strongyloidiasis. In parallel, we discuss data related to the autoinfective cycle that provides new insights into the biology of S. stercoralis. |
| first_indexed | 2024-03-13T07:27:57Z |
| format | Article |
| id | doaj.art-f4b6e759710c4a72aeb5c07aed6862d2 |
| institution | Directory Open Access Journal |
| issn | 1756-3305 |
| language | English |
| last_indexed | 2024-03-13T07:27:57Z |
| publishDate | 2014-12-01 |
| publisher | BMC |
| record_format | Article |
| series | Parasites & Vectors |
| spelling | doaj.art-f4b6e759710c4a72aeb5c07aed6862d22023-06-04T11:18:47ZengBMCParasites & Vectors1756-33052014-12-017111710.1186/s13071-014-0579-2Strongyloides stercoralis infection in marmosets: replication of complicated and uncomplicated human disease and parasite biologyVitor Luís Tenório Mati0Pedro Raso1Alan Lane de Melo2Department of Parasitology, ICB, UFMGDepartment of Pathological Anatomy and Legal Medicine, FM, UFMGDepartment of Parasitology, ICB, UFMGAbstract Background Strongyloides stercoralis can undergo an alternative autoinfective life cycle in the host, which, in some individuals can lead to a lethal infection. However, due to a number of factors, such as, the majority of those infected are from low-income backgrounds and the limitation in experimental models for studying human S. stercoralis, strongyloidiasis remains neglected. Improved knowledge of animal models that are susceptible to this parasite is needed in order to investigate the immunological mechanisms involved during infection and in particular to further understand the natural history of the autoinfective cycle. Methods Callithrix penicillata were inoculated subcutaneously with 100 (n = 2), 300 (n = 4) or 500 (n = 9) third-stage infective larvae (L3i) of S. stercoralis of human origin. Three marmosets received smaller inocula (i.e., one received 100 and two received 300 L3i) to ensure a greater capacity to withstand the infection after immunosuppression, which was triggered by administration of dexamethasone during early patency. Qualitative faecal analyses began at 7 days post-infection (DPI), and semi-quantitative tests were also performed for the dexamethasone-treated primates and the three matched controls. During the necropsies, specimens of S. stercoralis were recovered and tissue fragments were processed for histopathology. Results The mean prepatency and patency periods were 16.1 ± 3.0 and 161.1 ± 72.2 DPI, respectively. The marmosets typically tolerated the infection well, but immunosuppressed individuals exhibited higher numbers of larvae in the faeces and progressive clinical deterioration with late disseminated infection. In these cases, the number of females recovered was significantly higher than the number of inoculated L3i. Large quantities of larvae were observed migrating through the host tissues, and histopathology revealed pulmonary and intestinal injuries consistent with those observed in human strongyloidiasis. Conclusions Both complicated and uncomplicated strongyloidiasis occur in C. penicillata that is described as a susceptible small non-human primate model for S. stercoralis. This host permits the maintenance of a human strain of the parasite in the laboratory and can be useful for experimental investigations of strongyloidiasis. In parallel, we discuss data related to the autoinfective cycle that provides new insights into the biology of S. stercoralis.https://doi.org/10.1186/s13071-014-0579-2Strongyloides stercoralisNeotropical primate modelExperimental infectionGlucocorticoidHyperinfectionDisseminated infection |
| spellingShingle | Vitor Luís Tenório Mati Pedro Raso Alan Lane de Melo Strongyloides stercoralis infection in marmosets: replication of complicated and uncomplicated human disease and parasite biology Parasites & Vectors Strongyloides stercoralis Neotropical primate model Experimental infection Glucocorticoid Hyperinfection Disseminated infection |
| title | Strongyloides stercoralis infection in marmosets: replication of complicated and uncomplicated human disease and parasite biology |
| title_full | Strongyloides stercoralis infection in marmosets: replication of complicated and uncomplicated human disease and parasite biology |
| title_fullStr | Strongyloides stercoralis infection in marmosets: replication of complicated and uncomplicated human disease and parasite biology |
| title_full_unstemmed | Strongyloides stercoralis infection in marmosets: replication of complicated and uncomplicated human disease and parasite biology |
| title_short | Strongyloides stercoralis infection in marmosets: replication of complicated and uncomplicated human disease and parasite biology |
| title_sort | strongyloides stercoralis infection in marmosets replication of complicated and uncomplicated human disease and parasite biology |
| topic | Strongyloides stercoralis Neotropical primate model Experimental infection Glucocorticoid Hyperinfection Disseminated infection |
| url | https://doi.org/10.1186/s13071-014-0579-2 |
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