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Deshmukh, Abhijit S. and Gurupwar, Rajkumar and Mitra, Pallabi and Aswale, Kalyani and Shinde, Shilpshri and Chaudhari, Sandeep (2020) Toxoplasma gondii induces robust humoral immune response against cyst wall antigens in chronically infected animals and humans. Microbial Pathogenesis. p. 104643. ISSN 08824010

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Toxoplasma gondii differentiation from proliferating tachyzoites into latent bradyzoites is central to pathogenesis and transmission. Strong humoral immune response has been reported against tachyzoite antigens, however, antibody-mediated response towards bradyzoite antigens is poorly characterized. This work aimed to study the humoral immune response towards bradyzoite and associated cyst wall antigens particularly CST1. The immunoreactivity of 404 goats, 88 sheep and 92 human sera to recombinant (CST1 and SRS9) and native proteins of encysted bradyzoite along with well-established tachyzoite antigens (SAG1 and GRA7) was determined using ELISA, Western blot and immunofluorescence analysis (IFA). ELISA results revealed nearly 50% of sera contain T. gondii specific antibodies. Results were further validated using Western blot and IFA. T. gondii positive sera predominantly recognized the cyst wall besides the known tachyzoite surface antigens. The presence of CST1 antibodies in seropositive samples were in line with the staining patterns which were consistent with CST localization. Notably, T. gondii IgM- IgG + sera recognize the cyst wall whereas IgM + IgG-sera recognize tachyzoite antigens indicating acute infection consistent with presence of parasite DNA. The study demonstrates a strong humoral response against bradyzoite associated cyst wall antigens across naturally infected animals and humans. CST1 emerged as a key immunomodulatory antigen which may have direct implications for clinical immunodiagnostics.

Item Type: Article
Subjects: Animal Genetics and Genomics
Infectious Diseases
Inflammation Biology
Reproductive Biology
Genetic Engineering
Depositing User: Mr Harjit Singh
Date Deposited: 26 Nov 2020 10:51
Last Modified: 26 Nov 2020 10:51
URI: http://niab.sciencecentral.in/id/eprint/92

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