Parasite load in guinea pig foetus with real time PCR after maternofoetal transmission of toxoplasma gondii
Parasite loads of different tissues were assessed in guinea pig foetus after maternal infection. Twelve female guinea pigs were infected with 100 cysts of the 76 K strain of Toxoplasma gondii by the oral route. Inoculation was performed 20 ± 5 days (G20) or 40 ± 5 days (G40) after the beginning of g...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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EDP Sciences
2003-06-01
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| Series: | Parasite |
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1051/parasite/2003102133 |
| _version_ | 1797428390585696256 |
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| author | Flori P. Hafid J. Thonier V. Bellete B. Raberin H. Tran Manh Sung R. |
| author_facet | Flori P. Hafid J. Thonier V. Bellete B. Raberin H. Tran Manh Sung R. |
| author_sort | Flori P. |
| collection | DOAJ |
| description | Parasite loads of different tissues were assessed in guinea pig foetus after maternal infection. Twelve female guinea pigs were infected with 100 cysts of the 76 K strain of Toxoplasma gondii by the oral route. Inoculation was performed 20 ± 5 days (G20) or 40 ± 5 days (G40) after the beginning of gestation. Gestational age was determined by progesterone assay. Maternal and foetal organ samples were taken 60 days after the beginning of gestation. Parasite loads (from placenta, amniotic fluid (AF), cord blood (CB), foetal brain, liver, lung and spleen) were assessed by a real-time PCR quantification using fluorescence resonance energy transfer (FRET) hybridization probes on the Light Cycler®. Congenital transmission was proven by the presence of parasites in blood or tissue samples of the foetus in 84.6% (11/13) and 100 % (16/16) of cases after inoculation on G20 and G40 , respectively. The quantitative analysis of our results after inoculation at G20 and G40 has allowed us to determinate the positive parasitic loads as a function of the origin of the sample and the period of inoculation. The parasite loads expressed as log (parasite/g) were low in AF and CB samples: 1.49 ± 0.50 and 1.05 ± 0.10 at G20 and 1.21 ± 0.36 and 1.20 ± 0.42 at G40 respectively. In contrast the placenta and the different foetal tissues had higher parasite burdens: 2.89 ± 0.54 to 5.30 ± 0.51 at G20 and 2.81 ± 0.71 to 3.65 ± 0.59 at G40 . All the placentae were positive for parasites even in the two cases with no proven transmission. Real time quantitative PCR using the hybridization probe was a very sensitive and reproducible technique to study the kinetics of congenital toxoplasmosis in the guinea pig model wich is close to that of humans. |
| first_indexed | 2024-03-09T08:57:16Z |
| format | Article |
| id | doaj.art-7f1ed9a9ddf84535a84fcd8f94d6dd57 |
| institution | Directory Open Access Journal |
| issn | 1252-607X 1776-1042 |
| language | English |
| last_indexed | 2024-03-09T08:57:16Z |
| publishDate | 2003-06-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | Parasite |
| spelling | doaj.art-7f1ed9a9ddf84535a84fcd8f94d6dd572023-12-02T12:44:36ZengEDP SciencesParasite1252-607X1776-10422003-06-0110213314010.1051/parasite/2003102133parasite2003102p133Parasite load in guinea pig foetus with real time PCR after maternofoetal transmission of toxoplasma gondiiFlori P.Hafid J.Thonier V.Bellete B.Raberin H.Tran Manh Sung R.Parasite loads of different tissues were assessed in guinea pig foetus after maternal infection. Twelve female guinea pigs were infected with 100 cysts of the 76 K strain of Toxoplasma gondii by the oral route. Inoculation was performed 20 ± 5 days (G20) or 40 ± 5 days (G40) after the beginning of gestation. Gestational age was determined by progesterone assay. Maternal and foetal organ samples were taken 60 days after the beginning of gestation. Parasite loads (from placenta, amniotic fluid (AF), cord blood (CB), foetal brain, liver, lung and spleen) were assessed by a real-time PCR quantification using fluorescence resonance energy transfer (FRET) hybridization probes on the Light Cycler®. Congenital transmission was proven by the presence of parasites in blood or tissue samples of the foetus in 84.6% (11/13) and 100 % (16/16) of cases after inoculation on G20 and G40 , respectively. The quantitative analysis of our results after inoculation at G20 and G40 has allowed us to determinate the positive parasitic loads as a function of the origin of the sample and the period of inoculation. The parasite loads expressed as log (parasite/g) were low in AF and CB samples: 1.49 ± 0.50 and 1.05 ± 0.10 at G20 and 1.21 ± 0.36 and 1.20 ± 0.42 at G40 respectively. In contrast the placenta and the different foetal tissues had higher parasite burdens: 2.89 ± 0.54 to 5.30 ± 0.51 at G20 and 2.81 ± 0.71 to 3.65 ± 0.59 at G40 . All the placentae were positive for parasites even in the two cases with no proven transmission. Real time quantitative PCR using the hybridization probe was a very sensitive and reproducible technique to study the kinetics of congenital toxoplasmosis in the guinea pig model wich is close to that of humans.http://dx.doi.org/10.1051/parasite/2003102133congenital toxoplasmosisparasite loadguinea-pigreal-time PCR |
| spellingShingle | Flori P. Hafid J. Thonier V. Bellete B. Raberin H. Tran Manh Sung R. Parasite load in guinea pig foetus with real time PCR after maternofoetal transmission of toxoplasma gondii Parasite congenital toxoplasmosis parasite load guinea-pig real-time PCR |
| title | Parasite load in guinea pig foetus with real time PCR after maternofoetal transmission of toxoplasma gondii |
| title_full | Parasite load in guinea pig foetus with real time PCR after maternofoetal transmission of toxoplasma gondii |
| title_fullStr | Parasite load in guinea pig foetus with real time PCR after maternofoetal transmission of toxoplasma gondii |
| title_full_unstemmed | Parasite load in guinea pig foetus with real time PCR after maternofoetal transmission of toxoplasma gondii |
| title_short | Parasite load in guinea pig foetus with real time PCR after maternofoetal transmission of toxoplasma gondii |
| title_sort | parasite load in guinea pig foetus with real time pcr after maternofoetal transmission of toxoplasma gondii |
| topic | congenital toxoplasmosis parasite load guinea-pig real-time PCR |
| url | http://dx.doi.org/10.1051/parasite/2003102133 |
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