Quantification of Toxocara canis DNA by qPCR in mice inoculated with different infective doses

被引:3
|
作者
de Moura, Micaele Quintana [1 ]
da Silva Terto, Wesley Douglas [1 ]
da Costa Avila, Luciana Farias [2 ]
Campos, Vinicius Farias [3 ]
Domingues, William Borges [3 ]
Pinheiro, Natalia Berne [1 ]
Capella, Gabriela de Almeida [1 ]
Strothmann, Adriane Leites [1 ]
Scaini, Carlos James [2 ]
Aires Berne, Maria Elisabeth [1 ]
机构
[1] Univ Fed Pelotas UFPEL, Inst Biol, Pelotas, RS, Brazil
[2] Univ Fed Rio Grande FURG, Fac Med FAMED, Rio Grande, Brazil
[3] Univ Fed Pelotas UFPEL, Ctr Biotecnol, Pelotas, RS, Brazil
关键词
Quantitative real-time polymerase chain reaction (qPCR); Tissue digestion; Molecular diagnosis; Parasite load; toxocariasis; Visceral larva migrans; ANTIGENS; ASSAY; SPP; IGG; IDENTIFICATION; ANTIBODIES; DIAGNOSIS; LARVAE; LIVER; CATI;
D O I
10.1016/j.parint.2020.102134
中图分类号
R38 [医学寄生虫学]; Q [生物科学];
学科分类号
07 ; 0710 ; 09 ; 100103 ;
摘要
The nematode Toxocara canis is of public health importance and is the main causative agent of toxocariasis in humans. This disease is difficult to diagnose due to several factors, including the possibility of cross-reactions with other nematodes in the ELISA. To overcome this problem, molecular tests have been recommended as an alternative to identify the parasite. The quantitative real-time polymerase chain reaction (qPCR) technique was used in this study to identify and quantify the parasite load of T. canis in the mouse brain. To this end, 24 mice were divided into six groups, five of which were challenged with different infective doses of T. canis larvae (L3) (1000, 500, 250, 100 and 50 larvae), while the sixth group, uninfected, acted as negative control. Forty-five days after infection, the animals were euthanized to collect the brain, from which two portions of 20 mg of tissue were taken for DNA extraction, while the rest of the brain tissue was digested to quantify the number of larvae by microscopy. The number of DNA copies was calculated from the standard DNA quantification curve, showing values of E = 93.4%, R2 = 0.9655 and Y = -3.415. A strong positive correlation (R = 0, 81; p <.001) was found between the number of copies and the recovery of larvae from brain. However, the parasite's DNA was also identified even in animals from whose brain no larvae were recovered after tissue digestion. The results of this study therefore confirm that the qPCR technique can be a valuable tool for the detection and quantification of T. canis DNA in murine hosts, even in animals whose with tissues contain very few parasites.
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