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Fonseca GRE, Corral MA, Paula FMD, Meisel DMCL, Gryschek RCB, Lescano SAZ. Toxocara canis 30-35 kDa excretory-secretory antigen is an important marker in mice challenged by inocula containing different parasite load levels. Rev Inst Med Trop Sao Paulo 2022; 64:e9. [PMID: 35137903 PMCID: PMC8815846 DOI: 10.1590/s1678-9946202264009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Accepted: 01/06/2022] [Indexed: 11/22/2022] Open
Abstract
The Western-blotting technique was applied to identify antigenic fractions of excretory-secretory Toxocara canis antigen recognized by IgG antibodies throughout an experimental infection in mice challenged by different inocula. Mice were inoculated with 5, 50 and 500 embryonated eggs and serum samples were collected 15, 30, 60, 90 and 120 days post-infection. Serum samples were analyzed using an excretory-secretory Toxocara antigen. Antibodies recognized antigenic fractions from 30 to 90 kDa. The protein fraction of 30-35 kDa was the most frequently recognized regardless of the size of inoculum and the stage of infection represented by the different collection times, but the antigenic recognition was more evident in groups infected with 50 and 500 eggs. This study presents an antigenic panel of the excretory-secretory antigen of T. canis and suggests that the 30-35 kDa antigenic fraction is a promising marker of the infection and should be further explored in future studies on experimental toxocariasis.
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Affiliation(s)
| | | | - Fabiana Martins de Paula
- Universidade de São Paulo, Brazil; Universidade de São Paulo, Brazil; Universidade de São Paulo, Brazil
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Roldán Gonzáles WH, Meisel DMCL, de Paula FM, Gryschek RCB. Diagnostic accuracy of somatic and excretory-secretory antigens from Strongyloides venezuelensis infective larvae for the immunodiagnosis of human strongyloidiasis. Parasitology 2021; 148:1522-1527. [PMID: 35060455 PMCID: PMC11010145 DOI: 10.1017/s0031182021001207] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2021] [Revised: 06/23/2021] [Accepted: 06/25/2021] [Indexed: 11/06/2022]
Abstract
To evaluate the diagnostic accuracy of three types of antigenic preparations from Strongyloides venezuelensis infective larvae for detection of serum IgG anti-Strongyloides antibodies by enzyme-linked immunosorbent assay (ELISA). Soluble somatic fractions (SSF) and membrane somatic fractions (MSF) and excretory−secretory (E/S) products from S. venezuelensis infective larvae were evaluated against 71 sera from individuals with strongyloidiasis, 105 sera from healthy individuals, and 84 sera from individuals with other helminth infections. Using an ELISA cut-off for 100% sensitivity, E/S products were 97.88% specific followed by MSF (93.12%) and then by SSF (85.2%). The occurrence of cross-reactivity with other helminths was 4.76% (4/84) with E/S products, 8.33% (7/84) with MSF, and 17.86% (15/84) with SSF. For a cut-off for 100% specificity, E/S products showed a sensitivity of 88.73% whereas MSF and SSF showed sensitivities of 59.15% and 53.52%, respectively. In conclusion, E/S products were the best antigenic option for the serodiagnosis of human strongyloidiasis.
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Affiliation(s)
- William Henry Roldán Gonzáles
- Laboratório de Imunopatologia da Esquistossomose (Laboratório de Investigação Médica, LIM-06) Hospital das Clínicas, Faculdade de Medicina Universidade de São Paulo, São Paulo, Brazil
| | - Dirce Mary Correia Lima Meisel
- Laboratório de Imunopatologia da Esquistossomose (Laboratório de Investigação Médica, LIM-06) Hospital das Clínicas, Faculdade de Medicina Universidade de São Paulo, São Paulo, Brazil
| | - Fabiana Martins de Paula
- Laboratório de Imunopatologia da Esquistossomose (Laboratório de Investigação Médica, LIM-06) Hospital das Clínicas, Faculdade de Medicina Universidade de São Paulo, São Paulo, Brazil
- Instituto de Medicina Tropical, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
| | - Ronaldo Cesar Borges Gryschek
- Laboratório de Imunopatologia da Esquistossomose (Laboratório de Investigação Médica, LIM-06) Hospital das Clínicas, Faculdade de Medicina Universidade de São Paulo, São Paulo, Brazil
- Instituto de Medicina Tropical, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
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Paula FMD, Malta FM, Corral MA, Marques PD, Gottardi M, Meisel DMCL, Yamashiro J, Pinho JRR, Castilho VLP, Gonçalves EMDN, Gryschek RCB, Chieffi PP. DIAGNOSIS OF Strongyloides stercoralis INFECTION IN IMMUNOCOMPROMISED PATIENTS BY SEROLOGICAL AND MOLECULAR METHODS. Rev Inst Med Trop Sao Paulo 2016; 58:63. [PMID: 27680168 PMCID: PMC5048634 DOI: 10.1590/s1678-9946201658063] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2015] [Accepted: 03/23/2016] [Indexed: 11/22/2022] Open
Abstract
Strongyloidiasis is a potentially serious infection in immunocompromised patients.
Thus, the availability of sensitive and specific diagnostic methods is desirable,
especially in the context of immunosuppressed patients in whom the diagnosis and
treatment of strongyloidiasis is of utmost importance. In this study, serological and
molecular tools were used to diagnose Strongyloides stercoralis
infections in immunosuppressed patients. Serum and stool samples were obtained from
52 patients. Stool samples were first analyzed by Lutz, Rugai, and Agar plate culture
methods, and then by a quantitative real time polymerase chain reaction (qPCR). Serum
samples were evaluated by an enzyme-linked immunosorbent assay (ELISA) using a
soluble (AS) or a membrane fractions antigen (AM) obtained from alkaline solutions of
the filariform larvae of Strongyloides venezuelensis. Of the 52
immunosuppressed patients, three (5.8%) were positive for S.
stercoralis by parasitological methods, compared to two patients (3.8%)
and one patient (1.9%) who were detected by ELISA using the AS and the AM antigens,
respectively. S. stercoralis DNA was amplified in seven (13.5%)
stool samples by qPCR. These results suggest the utility of qPCR as an alternative
diagnostic tool for the diagnosis of S. stercoralis infection in
immunocompromised patients, considering the possible severity of this helminthiasis
in this group of patients.
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Affiliation(s)
- Fabiana Martins de Paula
- Universidade de São Paulo, Instituto de Medicina Tropical de São Paulo. São Paulo, SP, Brazil. E-mails: ; ; ; ; .,Universidade de São Paulo, Hospital das Clínicas da Faculdade de Medicina, Laboratório de Investigação Médica. São Paulo, SP, Brazil. E-mails: ; ; ; ; ;
| | - Fernanda Mello Malta
- Universidade de São Paulo, Instituto de Medicina Tropical de São Paulo. São Paulo, SP, Brazil. E-mails: ; ; ; ; .,Universidade de São Paulo, Hospital das Clínicas da Faculdade de Medicina Laboratório de Gastroenterologia e Hepatologia Tropical. São Paulo, SP, Brazil. E-mail: ;
| | - Marcelo Andreetta Corral
- Universidade de São Paulo, Hospital das Clínicas da Faculdade de Medicina, Laboratório de Investigação Médica. São Paulo, SP, Brazil. E-mails: ; ; ; ; ;
| | - Priscilla Duarte Marques
- Universidade de São Paulo, Instituto de Medicina Tropical de São Paulo. São Paulo, SP, Brazil. E-mails: ; ; ; ; .,Universidade de São Paulo, Hospital das Clínicas da Faculdade de Medicina, Laboratório de Investigação Médica. São Paulo, SP, Brazil. E-mails: ; ; ; ; ;
| | - Maiara Gottardi
- Universidade de São Paulo, Hospital das Clínicas da Faculdade de Medicina, Laboratório de Investigação Médica. São Paulo, SP, Brazil. E-mails: ; ; ; ; ;
| | - Dirce Mary Correia Lima Meisel
- Universidade de São Paulo, Hospital das Clínicas da Faculdade de Medicina, Laboratório de Investigação Médica. São Paulo, SP, Brazil. E-mails: ; ; ; ; ;
| | - Juliana Yamashiro
- Universidade de São Paulo, Hospital das Clínicas da Faculdade de Medicina, Laboratório de Investigação Médica. São Paulo, SP, Brazil. E-mails: ; ; ; ; ;
| | - João Renato Rebello Pinho
- Universidade de São Paulo, Instituto de Medicina Tropical de São Paulo. São Paulo, SP, Brazil. E-mails: ; ; ; ; .,Universidade de São Paulo, Hospital das Clínicas da Faculdade de Medicina Laboratório de Gastroenterologia e Hepatologia Tropical. São Paulo, SP, Brazil. E-mail: ;
| | - Vera Lucia Pagliusi Castilho
- Universidade de São Paulo, Hospital das Clínicas da Faculdade de Medicina, Seção de Parasitologia, Divisão de Laboratório Central. São Paulo, SP, Brazil. E-mails: ;
| | - Elenice Messias do Nascimento Gonçalves
- Universidade de São Paulo, Hospital das Clínicas da Faculdade de Medicina, Seção de Parasitologia, Divisão de Laboratório Central. São Paulo, SP, Brazil. E-mails: ;
| | - Ronaldo César Borges Gryschek
- Universidade de São Paulo, Instituto de Medicina Tropical de São Paulo. São Paulo, SP, Brazil. E-mails: ; ; ; ; .,Universidade de São Paulo, Hospital das Clínicas da Faculdade de Medicina, Laboratório de Investigação Médica. São Paulo, SP, Brazil. E-mails: ; ; ; ; ;
| | - Pedro Paulo Chieffi
- Universidade de São Paulo, Instituto de Medicina Tropical de São Paulo. São Paulo, SP, Brazil. E-mails: ; ; ; ; .,Faculdade de Ciências Médicas, Santa Casa. São Paulo, SP, Brazil. E-mail:
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Corral MA, Paula FMD, Gottardi M, Meisel DMCL, Castilho VLP, Gonçalves EMDN, Chieffi PP, Gryschek RCB. IMMUNODIAGNOSIS OF HUMAN STRONGYLOIDIASIS: USE OF SIX DIFFERENT ANTIGENIC FRACTIONS FROM Strongyloides venezuelensis PARASITIC FEMALES. Rev Inst Med Trop Sao Paulo 2016; 57:427-30. [PMID: 26603231 PMCID: PMC4660453 DOI: 10.1590/s0036-46652015000500010] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2015] [Accepted: 06/19/2015] [Indexed: 11/23/2022] Open
Abstract
The aim of this study was to evaluate six different antigenic fractions from Strongyloides venezuelensis parasitic females for the immunodiagnosis of human strongyloidiasis. Soluble and membrane fractions from S. venezuelensis parasitic females were prepared in phosphate-buffered saline (SSF and SMF, respectively), Tris-HCl (TSF and TMF, respectively), and an alkaline buffer (ASF and AMF, respectively). Serum samples obtained from patients with strongyloidiasis or, other parasitic diseases, and healthy individuals were analyzed by enzyme-linked immunosorbent assay (ELISA). Soluble fractions SSF, TSF, and ASF showed 85.0%, 75.0%, and 80.0% sensitivity and 93.1%, 93.1%, and 87.5% specificity, respectively. Membrane fractions SMF, TMF, and AMF showed 80.0%, 75.0%, and 85.0% sensitivity, and 95.8%, 90.3%, and 91.7% specificity, respectively. In conclusion, the present results suggest that the fractions obtained from parasitic females, especially the SSF and SMF, could be used as alternative antigen sources in the serodiagnosis of human strongyloidiasis.
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Affiliation(s)
| | | | - Maiara Gottardi
- Instituto de Medicina Tropical de São Paulo, Universidade de São Paulo, São Paulo, SP, Brasil
| | | | | | | | - Pedro Paulo Chieffi
- Instituto de Medicina Tropical de São Paulo, Universidade de São Paulo, São Paulo, SP, Brasil
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Corral MA, Paula FM, Gottardi M, Meisel DMCL, Chieffi PP, Gryschek RCB. Membrane fractions from Strongyloides venezuelensis in the immunodiagnosis of human strongyloidiasis. Rev Inst Med Trop Sao Paulo 2015; 57:77-80. [PMID: 25651330 PMCID: PMC4325527 DOI: 10.1590/s0036-46652015000100011] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2014] [Accepted: 08/06/2014] [Indexed: 11/22/2022] Open
Abstract
Strongyloides venezuelensis is a parasitic nematode of rodents
frequently used to obtain heterologous antigens for the immunological diagnosis of
human strongyloidiasis. The aim of this study was to evaluate membrane fractions from
S. venezuelensis for human strongyloidiasis immunodiagnosis.
Soluble and membrane fractions were obtained in phosphate saline (SS and SM) and
Tris-HCl (TS and TM) from filariform larvae of S. venezuelensis.
Ninety-two serum samples (n = 92) were obtained from 20 strongyloidiasis patients
(Group I), 32 from patients with other parasitic diseases (Group II), and 40 from
healthy individuals (Group III), and were analyzed by enzyme-linked immunosorbent
assay (ELISA). Soluble fractions (SS and TS) showed 90.0% sensitivity and 88.9%
specificity, whereas the membrane fractions (SM and TM) showed 95.0% sensitivity and
94.4% specificity. The present results suggest the possible use of membrane fractions
of S. venezuelensis as an alternative antigen for human
strongyloidiasis immunodiagnosis.
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Affiliation(s)
| | - Fabiana Martins Paula
- Laboratório de Investigação Médica (LIM-06), Hospital das Clínicas da Faculdade de Medicina, São Paulo, SP, Brazil
| | - Maiara Gottardi
- Instituto de Medicina Tropical de São Paulo, São Paulo, SP, Brazil
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