Parasites, Hosts and Diseases

"Zhaoshou Yang"

Brief Communication

Detection of Human Anti-Trypanosoma cruzi Antibody with Recombinant Fragmented Ribosomal P Protein: Yeong Hoon Kim, Zhaoshou Yang, Jihoo Lee, Hye-Jin Ahn, Chom-Kyu Chong, Wagner Maricondi, Ronaldo F. Dias, Ho-Woo Nam; Korean J Parasitol 2019;57(4):435-437.
Published online August 31, 2019; DOI: https://doi.org/10.3347/kjp.2019.57.4.435

Abstract
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Chagas disease is caused by the protozoan parasite Trypanosoma cruzi, and is endemic in many Latin American countries. Diagnosis is based on serologic testing and the WHO recommends two or more serological tests for confirmation. Acidic ribosomal P protein of T. cruzi showed strong reactivity against positive sera of patients, and we cloned the protein after fragmenting it to enhance its antigenicity and solubility. Twelve positive sera of Chagas disease patients were reacted with the fragmented ribosomal P protein using western blot. Detection rate and density for each fragment were determined. Fragments F1R1, F1R2, and F2R1 showed 100% rate of detection, and average density scoring of 2.00, 1.67, and 2.42 from a maximum of 3.0, respectively. Therefore, the F2R1 fragment of the ribosomal P protein of T. cruzi could be a promising antigen to use in the diagnosis of Chagas disease in endemic regions with high specificity and sensitivity.

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In vitro diagnostic methods of Chagas disease in the clinical laboratory: a scoping review
Luis C. Ascanio, Savannah Carroll, Alberto Paniz-Mondolfi, Juan David Ramírez
Frontiers in Microbiology.2024;[Epub] CrossRef
A refined genome phage display methodology delineates the human antibody response in patients with Chagas disease
André Azevedo Reis Teixeira, Luis Rodriguez Carnero, Andréia Kuramoto, Fenny Hui Fen Tang, Carlos Hernique Gomes, Natalia Bueno Pereira, Léa Campos de Oliveira, Regina Garrini, Jhonatas Sirino Monteiro, João Carlos Setubal, Ester Cerdeira Sabino, Renata P
iScience.2021; 24(6): 102540. CrossRef

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Original Article

Suppressors for Human Epidermal Growth Factor Receptor 2/4 (HER2/4): A New Family of Anti-Toxoplasmic Agents in ARPE-19 Cells: Yeong Hoon Kim, Lokraj Bhatt, Hye-Jin Ahn, Zhaoshou Yang, Won-Kyu Lee, Ho-Woo Nam; Korean J Parasitol 2017;55(5):491-503.
Published online October 31, 2017; DOI: https://doi.org/10.3347/kjp.2017.55.5.491

Abstract
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The effects of tyrosine kinase inhibitors (TKIs) were evaluated on growth inhibition of intracellular Toxoplasma gondii in host ARPE-19 cells. The number of tachyzoites per parasitophorous vacuolar membrane (PVM) was counted after treatment with TKIs. T. gondii protein expression was assessed by western blot. Immunofluorescence assay was performed using Programmed Cell Death 4 (PDCD4) and T. gondii GRA3 antibodies. The TKIs were divided into 3 groups; non-epidermal growth factor receptor (non-EGFR), anti-human EGFR 2 (anti-HER2), and anti-HER2/4 TKIs, respectively. Group I TKIs (nintedanib, AZD9291, and sunitinib) were unable to inhibit proliferation without destroying host cells. Group II TKIs (lapatinib, gefitinib, erlotinib, and AG1478) inhibited proliferation up to 98% equivalent to control pyrimethamine (5 ?M) at 20 μM and higher, without affecting host cells. Group III TKIs (neratinib, dacomitinib, afatinib, and pelitinib) inhibited proliferation up to 98% equivalent to pyrimethamine at 1-5 μM, but host cells were destroyed at 10-20 ?M. In Group I, TgHSP90 and SAG1 inhibitions were weak, and GRA3 expression was moderately inhibited. In Group II, TgHSP90 and SAG1 expressions seemed to be slightly enhanced, while GRA3 showed none to mild inhibition; however, AG1478 inhibited all proteins moderately. Protein expression was blocked in Group III, comparable to pyrimethamine. PDCD4 and GRA3 were well localized inside the nuclei in Group I, mildly disrupted in Group II, and were completely disrupted in Group III. This study suggests the possibility of a vital T. gondii TK having potential HER2/4 properties, thus anti-HER2/4 TKIs may inhibit intracellular parasite proliferation with minimal adverse effects on host cells.

Citations

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Small molecule kinase inhibitor altiratinib inhibits brain cyst forming bradyzoites of Toxoplasma gondii
Yeong Hoon Kim, Hye-Jin Ahn, Hwa Sun Kim, Ho-Woo Nam
Journal of Microbiology.2025; 63(2): e2409001. CrossRef
The antimicrobial activity of innate host-directed therapies: A systematic review
Tirosh Shapira, Matthew Christofferson, Yossef Av-Gay
International Journal of Antimicrobial Agents.2024; 63(5): 107138. CrossRef
Novel therapeutic opportunities for Toxoplasma gondii, Trichomonas vaginalis, and Giardia intestinalis infections
Francesca Arrighi, Arianna Granese, Paola Chimenti, Paolo Guglielmi
Expert Opinion on Therapeutic Patents.2023; 33(3): 211. CrossRef
Latent Toxoplasmosis among Breast Cancer Patients in Jahrom, South of Iran
Marzeieh Haghbin, Salar Maani, Mohammad Aref Bagherzadeh, Ahmadreza Bazmjoo, Heshmatollah Shakeri, Ali Taghipour, Shahab Falahi, Azra Kenarkoohi, Milad Badri, Amir Abdoli, Mubashir Javed Mintoo
International Journal of Breast Cancer.2023; 2023: 1. CrossRef
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Qidong Tang, Ting Peng, Jie Hu, Tao Zhang, Pengqin Chen, Daoxing Chen, Yunjie Wang, Lingfeng Chen, Linjiang Tong, Yi Chen, Hua Xie, Guang Liang
European Journal of Medicinal Chemistry.2022; 233: 114249. CrossRef
Secretome Analysis of Host Cells Infected with Toxoplasma gondii after Treatment of Human Epidermal Growth Factor Receptor 2/4 Inhibitors
Hye-Jung Kim, Hye-Jin Ahn, Hyeweon Kang, Jaehui Park, Seul gi Oh, Saehae Choi, Won-Kyu Lee, Ho-Woo Nam
The Korean Journal of Parasitology.2020; 58(3): 249. CrossRef

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Brief Communication

Western Blot Detection of Human Anti-Chikungunya Virus Antibody with Recombinant Envelope 2 Protein: Zhaoshou Yang, Jihoo Lee, Hye-Jin Ahn, Chom-Kyu Chong, Ronaldo F. Dias, Ho-Woo Nam; Korean J Parasitol 2016;54(2):239-241.
Published online April 30, 2016; DOI: https://doi.org/10.3347/kjp.2016.54.2.239

Abstract
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Chikungunya virus (CHIKV), a tropical pathogen, has re-emerged and has massive outbreaks abruptly all over the world. Containing many dominant epitopes, the envelope E2 protein of CHIKV has been explored for the vaccination or diagnosis. In the present study, the antigenicity of a recombinant expressed intrinsically disorder domain (IUD) of E2 was tested for the detection of the antibody against CHIKV through western blot method. The gene of the IUD of E2 was inserted into 2 different vectors and expressed as recombinant GST-E2 and recombinant MBP-E2 fusion protein, respectively. Two kinds of fusion proteins were tested with 30 CHIKV patient sera and 30 normal sera, respectively. Both proteins were detected by 25 patients sera (83.3%) and 1 normal serum (3.3%). This test showed a relatively high sensitivity and very high specificity of the recombinant E2 proteins to be used as diagnostic antigens against CHIKV infection.

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Medical viruses: diagnostic techniques
Harsh, Pratima Tripathi
Virology Journal.2023;[Epub] CrossRef
Diagnostic accuracy of serological tests for the diagnosis of Chikungunya virus infection: A systematic review and meta-analysis
Anna Andrew, Tholasi Nadhan Navien, Tzi Shien Yeoh, Marimuthu Citartan, Ernest Mangantig, Magdline S. H. Sum, Ewe Seng Ch’ng, Thean-Hock Tang, Guilherme S. Ribeiro
PLOS Neglected Tropical Diseases.2022; 16(2): e0010152. CrossRef
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Sharifah Aliah Diyanah Syed Hussin, Ang-Lim Chua, Hassanain Al-Talib, Shamala Devi Sekaran, Seok Mui Wang
Journal of Pure and Applied Microbiology.2022; 16(4): 2225. CrossRef
Molecular and Immunological Diagnostic Techniques of Medical Viruses
Daniel Hussien Reta, Tesfaye Sisay Tessema, Addis Simachew Ashenef, Adey Feleke Desta, Wajana Lako Labisso, Solomon Tebeje Gizaw, Solomon Mequanente Abay, Daniel Seifu Melka, Fisseha Alemu Reta
International Journal of Microbiology.2020; 2020: 1. CrossRef
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Rui Liu, Ping Ji, Bin Liu, Haishi Qiao, Xia Wang, Likun Zhou, Ting Deng, Yi Ba
Oncology Letters.2017; 13(2): 1024. CrossRef

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Original Article

Afatinib Reduces STAT6 Signaling of Host ARPE-19 Cells Infected with Toxoplasma gondii: Zhaoshou Yang, Hye-Jin Ahn, Young-Hoon Park, Ho-Woo Nam; Korean J Parasitol 2016;54(1):31-38.
Published online February 26, 2016; DOI: https://doi.org/10.3347/kjp.2016.54.1.31

Abstract
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Specific gene expressions of host cells by spontaneous STAT6 phosphorylation are major strategy for the survival of intracellular Toxoplasma gondii against parasiticidal events through STAT1 phosphorylation by infection provoked IFN-γ. We determined the effects of small molecules of tyrosine kinase inhibitors (TKIs) on the growth of T. gondii and on the relationship with STAT1 and STAT6 phosphorylation in ARPE-19 cells. We counted the number of T. gondii RH tachyzoites per parasitophorous vacuolar membrane (PVM) after treatment with TKIs at 12-hr intervals for 72 hr. The change of STAT6 phosphorylation was assessed via western blot and immunofluorescence assay. Among the tested TKIs, Afatinib (pan ErbB/EGFR inhibitor, 5 ?M) inhibited 98.0% of the growth of T. gondii, which was comparable to pyrimethamine (5 ?M) at 96.9% and followed by Erlotinib (ErbB1/EGFR inhibitor, 20 ?M) at 33.8% and Sunitinib (PDGFR or c-Kit inhibitor, 10 ?M) at 21.3%. In the early stage of the infection (2, 4, and 8 hr after T. gondii challenge), Afatinib inhibited the phosphorylation of STAT6 in western blot and immunofluorescence assay. Both JAK1 and JAK3, the upper hierarchical kinases of cytokine signaling, were strongly phosphorylated at 2 hr and then disappeared entirely after 4 hr. Some TKIs, especially the EGFR inhibitors, might play an important role in the inhibition of intracellular replication of T. gondii through the inhibition of the direct phosphorylation of STAT6 by T. gondii.

Citations

Citations to this article as recorded by

Small molecule kinase inhibitor altiratinib inhibits brain cyst forming bradyzoites of Toxoplasma gondii
Yeong Hoon Kim, Hye-Jin Ahn, Hwa Sun Kim, Ho-Woo Nam
Journal of Microbiology.2025; 63(2): e2409001. CrossRef
iTRAQ-Based Phosphoproteomic Analysis Exposes Molecular Changes in the Small Intestinal Epithelia of Cats after Toxoplasma gondii Infection
Bintao Zhai, Yu-Meng Meng, Shi-Chen Xie, Jun-Jie Peng, Yang Liu, Yanhua Qiu, Lu Wang, Jiyu Zhang, Jun-Jun He
Animals.2023; 13(22): 3537. CrossRef
Secretome Analysis of Host Cells Infected with Toxoplasma gondii after Treatment of Human Epidermal Growth Factor Receptor 2/4 Inhibitors
Hye-Jung Kim, Hye-Jin Ahn, Hyeweon Kang, Jaehui Park, Seul gi Oh, Saehae Choi, Won-Kyu Lee, Ho-Woo Nam
The Korean Journal of Parasitology.2020; 58(3): 249. CrossRef
A Human Proteome Array Approach to Identifying Key Host Proteins Targeted by Toxoplasma Kinase ROP18
Zhaoshou Yang, Yongheng Hou, Taofang Hao, Hee-Sool Rho, Jun Wan, Yizhao Luan, Xin Gao, Jianping Yao, Aihua Pan, Zhi Xie, Jiang Qian, Wanqin Liao, Heng Zhu, Xingwang Zhou
Molecular & Cellular Proteomics.2017; 16(3): 469. CrossRef
Adverse Event Profile of Pyrimethamine-Based Therapy in Toxoplasmosis: A Systematic Review
Ruben R. Ben-Harari, Elizabeth Goodwin, Julio Casoy
Drugs in R&D.2017; 17(4): 523. CrossRef
Suppressors for Human Epidermal Growth Factor Receptor 2/4 (HER2/4): A New Family of Anti-Toxoplasmic Agents in ARPE-19 Cells
Yeong Hoon Kim, Lokraj Bhatt, Hye-Jin Ahn, Zhaoshou Yang, Won-Kyu Lee, Ho-Woo Nam
The Korean Journal of Parasitology.2017; 55(5): 491. CrossRef

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Brief Communications

Chronic Toxoplasmosis Modulates the Induction of Contact Hypersensitivity by TNCB in Mouse Model: Zhaoshou Yang, Hye-Jin Ahn, Ho-Woo Nam; Korean J Parasitol 2015;53(6):755-757.
Published online December 31, 2015; DOI: https://doi.org/10.3347/kjp.2015.53.6.755

Abstract
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Mouse models of chronic toxoplasmosis and atopic dermatitis (AD) were combined to clarify the effect of opportunistic Toxoplama gondii infection on the development of AD. AD was induced as a chronic contact hypersensitivity (CHS) with repeated challenge of 2,4,6-trinitro-1-chlorobenzene (TNCB) on the dorsal skin of mice. TNCB induced skin thickness increases in both normal and toxoplasmic mice. The changing patterns were different from the sigmoidal which saturated at 20 days in normal mice to the convex saturated at 12 days in toxoplasmic mice with the crossing at 18 days. Compared to normal mice, toxoplasmic mice presented CHS more severely in earlier times and then moderately in later times. These data suggest that host immune modification by T. gondii infection enhances CHS in early times of atopic stimulation but soothes the reaction of CHS in later times in mouse model.

Citations

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Effect of orally administered exopolysaccharides produced by Lactococcus lactis subsp. cremoris FC on a mouse model of dermatitis induced by repeated exposure to 2,4,6-trinitro-1-chlorobenzene
Yayoi Gotoh, Shiho Suzuki, Midori Amako, Shinichi Kitamura, Toshiya Toda
Journal of Functional Foods.2017; 35: 43. CrossRef

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Gefitinib Inhibits the Growth of Toxoplasma gondii in HeLa Cells: Zhaoshou Yang, Hye-Jin Ahn, Ho-Woo Nam; Korean J Parasitol 2014;52(4):439-441.
Published online August 29, 2014; DOI: https://doi.org/10.3347/kjp.2014.52.4.439

Abstract
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Toxoplasma gondii is the causative agent of toxoplasmosis with symptoms of congenital neurological and ocular diseases and acquired lymphadenitis, retinochoroiditis, and meningoencephalitis. Small molecules which block the activity of protein kinases were tested in in vitro culture of T. gondii to find new therapeutic drugs of safer and more effective than the combined administration of pyrimethamine and sulfadoxine that sometimes provoke lethal Stevens-Johnson syndrome. Among them, Gefitinib and Crizotinib inhibited intracellular growth of T. gondii in HeLa cells by counting the number of T. gondii per parasitophorous vacuolar membrane whereas Sunitinib did not. Gefitinib inhibited the growth of T. gondii in a dose-dependent manner over 5 ?M up to the tolerable concentration of HeLa cells and halted the division of the parasite immediately from the time point of treatment. Gefitinib inhibition suggests that tyrosine kinases of EGFR family or other homologous kinases of the parasite itself may be the target to cause the block of T. gondii growth.

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Austin Lui, Jordan Vanleuven, David Perekopskiy, Dewey Liu, Desiree Xu, Omar Alzayat, Taiseer Elgokhy, Timothy Do, Meghan Gann, Ryan Martin, Da-Zhi Liu
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Suppressors for Human Epidermal Growth Factor Receptor 2/4 (HER2/4): A New Family of Anti-Toxoplasmic Agents in ARPE-19 Cells
Yeong Hoon Kim, Lokraj Bhatt, Hye-Jin Ahn, Zhaoshou Yang, Won-Kyu Lee, Ho-Woo Nam
The Korean Journal of Parasitology.2017; 55(5): 491. CrossRef
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Original Articles

High Expression of Water-Soluble Recombinant Antigenic Domains of Toxoplasma gondii Secretory Organelles: Zhaoshou Yang, Hye-Jin Ahn, Ho-Woo Nam; Korean J Parasitol 2014;52(4):367-376.
Published online August 29, 2014; DOI: https://doi.org/10.3347/kjp.2014.52.4.367

Abstract
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Recombinant antigenic proteins of Toxoplasma gondii are alternative source of antigens which are easily obtainable for serodiagnosis of toxoplasmosis. In this study, highly antigenic secretory organellar proteins, dense granular GRA2 and GRA3, rhoptrial ROP2, and micronemal MIC2, were analyzed by bioinformatics approach to express as water-soluble forms of antigenic domains. The transmembrane region and disorder tendency of 4 secretory proteins were predicted to clone the genes into pGEX-4T-1 vector. Recombinant plasmids were transformed into BL21 (DE3) pLysS E. coli, and GST fusion proteins were expressed with IPTG. As a result, GST fusion proteins with GRA2_25-105, GRA3_39-138, ROP2_324-561, and MIC2_1-284 domains had respectively higher value of IgG avidity. The rGST-GRA2_25-105 and rGST-GRA3_39-138 were soluble, while rGST-ROP2_324-561 and rGST-MIC2_1-284 were not. GRA2_31-71, intrinsically unstructured domain (IUD) of GRA2, was used as a linker to enhance the solubility. The rGST-GRA2_31-71-ROP2_324-561, a chimeric protein, appeared to be soluble. Moreover, rGST-GRA2_31-71-MIC2_1-284 was also soluble and had higher IgG avidity comparing to rGST-MIC2_1-284. These 4 highly expressed and water-soluble recombinant antigenic proteins may be promising candidates to improve the serodiagnosis of toxoplasmosis in addition to the major surface antigen of SAG1.

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Single Cell Expression Systems for the Production of Recombinant Proteins for Immunodiagnosis and Immunoprophylaxis of Toxoplasmosis
Karolina Sołowińska, Lucyna Holec-Gąsior
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A vaccine using Anaplasma marginale subdominant type IV secretion system recombinant proteins was not protective against a virulent challenge
Macarena Sarli, María B. Novoa, Matilde N. Mazzucco, Marcelo L. Signorini, Ignacio E. Echaide, Susana T. de Echaide, María E. Primo, Paulo Lee Ho
PLOS ONE.2020; 15(2): e0229301. CrossRef
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María E. Primo, Carolina S. Thompson, Beatriz S. Valentini, Macarena Sarli, María B. Novoa, Atilio J. Mangold, Susana T. de Echaide, Ulrike Gertrud Munderloh
PLOS ONE.2019; 14(1): e0211149. CrossRef
TheToxoplasma gondiidense granule protein TgGRA3 interacts with host Golgi and dysregulates anterograde transport
Maika S. Deffieu, Tchilabalo Dilezitoko Alayi, Christian Slomianny, Stanislas Tomavo
Biology Open.2019;[Epub] CrossRef

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Probability of Antibody Formation against Circumsporozoite Protein of Plasmodium vivax among Korean Malaria Patients: Ho-Woo Nam, Kyoung Ju Song, Hye Jin Ahn, Zhaoshou Yang, Chom-Kyu Chong, Pyo Yun Cho, Seong Kyu Ahn, Tong-Soo Kim; Korean J Parasitol 2014;52(2):143-149.
Published online April 18, 2014; DOI: https://doi.org/10.3347/kjp.2014.52.2.143

Abstract
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To evaluate the seroprevalence against circumsporozoite protein (CSP) of Plasmodium vivax in sera of Korean patients, the central repeating domain (CRD) of CSP was cloned and analyzed. From the genomic DNA of patient's blood, 2 kinds of CSPs were identified to belong to a VK210 type, which is the dominant repeating of GDRA(D/A)GQPA, and named as PvCSPA and PvCSPB. Recombinantly expressed his-tagged PvCSPA or PvCSPB in Escherichia coli reacted well against sera of patients in western blot, with the detecting rate of 47.9% (58/121), which included 15 cases positive for PvCSPA, 6 cases positive for PvCSPB, and 37 cases for both. The mixture of PvCSPA and PvCSPB was loaded to a rapid diagnostic test kit (RDT) and applied with the same set of patient sera, which resulted in detection rates of 57.0% (69/121). When the protein sequences of PvCSPA were compared with those of P. vivax in endemic regions of India and Uganda, they were compatibly homologous to PvCSPA with minor mutations. These results suggested that the recombinant PvCSPA and PvCSPB loaded RDT may be a milestone in latent diagnosis which has been a hot issue of domestic malaria and important for radical therapy in overlapped infections with P. falciparum in tropical and subtropical areas. During the biological process of malarial infection, exposure of CSP to antigen-antibody reaction up to 57.0% is the first report in Korea.

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Seda Yerlikaya, Ewurama D A Owusu, Augustina Frimpong, Robert Kirk DeLisle, Xavier C Ding
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Structure-genetic diversity and recombinant protein of circumsporozoite protein (CSP) of vivax malaria antigen: A potential malaria vaccine candidate
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Serological responses to a soluble recombinant circumsporozoite protein-VK210 of Plasmodium vivax (rPvCSP-VK210) among Iranian malaria patients
Mehdi Nateghpour, Soudabeh Etemadi, Afsaneh Motevalli Haghi, Hamid Eslami, Mehdi Mohebali, Leila Farivar
European Journal of Medical Research.2021;[Epub] CrossRef
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Francis D. Krampa, Yaw Aniweh, Prosper Kanyong, Gordon A. Awandare
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Genetic Diversity of Plasmodium vivax Causing Epidemic Malaria in the Republic of Korea
Young Yil Bahk, Jeonga Kim, Seong Kyu Ahn, Byoung-Kuk Na, Jong-Yil Chai, Tong-Soo Kim
The Korean Journal of Parasitology.2018; 56(6): 545. CrossRef
Plasmodium vivax msp-3α polymorphisms: analysis in the Indian subcontinent
Anju Verma, Hema Joshi, Vineeta Singh, Anup Anvikar, Neena Valecha
Malaria Journal.2016;[Epub] CrossRef

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A Rapid Diagnostic Test for Toxoplasmosis using Recombinant Antigenic N-terminal Half of SAG1 Linked with Intrinsically Unstructured Domain of GRA2 Protein: Kyoung Ju Song, Zhaoshou Yang, Chom-Kyu Chong, Jin-Soo Kim, Kyung Chan Lee, Tong-Soo Kim, Ho-Woo Nam; Korean J Parasitol 2013;51(5):503-510.
Published online October 31, 2013; DOI: https://doi.org/10.3347/kjp.2013.51.5.503

Abstract
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Toxoplasma gondii is an apicomplexan parasite with a broad host range of most warm-blooded mammals including humans, of which one-thirds of the human population has been infected worldwide which can cause congenital defects, abortion, and neonatal complications. Here, we developed a rapid diagnostic test (RDT) for T. gondii infection. Antigenic N-terminal half of the major surface antigen (SAG1) was linked with intrinsically unstructured domain (IUD) of dense granule protein 2 (GRA2). The recombinant GST-GRA2-SAG1A protein was successfully expressed and purified as 51 kDa of molecular weight. Furthermore, antigenicity and solubility of the rGST-GRA2-SAG1A protein were significantly increased. The overall specificity and sensitivity of GST-GRA2-SAG1A loaded RDT (TgRDT) were estimated as 100% and 97.1% by comparing with ELISA result which uses T. gondii whole cell lysates as the antigen. The TgRDT tested with Uganda people sera for field trial and showed 31.9% of seroprevalence against T. gondii antibody. The TgRDT is proved to be a kit for rapid and easy to use with high accuracy, which would be a suitable serodiagnostic tool for toxoplasmosis.

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A Surge in the Seroprevalence of Toxoplasmosis among the Residents of Islands in Gangwha-gun, Incheon, Korea: Zhaoshou Yang, Pyo Yun Cho, Seong Kyu Ahn, Hye-Jin Ahn, Tong-Soo Kim, Chom-Kyu Chong, Sung-Jong Hong, Seok Ho Cha, Ho-Woo Nam; Korean J Parasitol 2012;50(3):191-197.
Published online August 13, 2012; DOI: https://doi.org/10.3347/kjp.2012.50.3.191

Abstract
PDF

Seroepidemiological changes of Toxoplasma gondii infection among the residents of the islands of Gangwha-gun, Incheon for 2 years were surveyed and evaluated by ELISA using a crude extract antigen. In 2010, sera of 919 adult residents in Gyodong-myeon and 313 adults in Samsan-myeon were collected and checked for IgG antibody titers, which showed 14.5% (133 sera) and 19.8% (62 sera) positive rates, respectively. In 2011, sera of 955 adults in Gyodong-myeon and 341 adults in Samsan-myeon were examined, which showed an increase of positive rates to 23.8% (227 sera) and 31.7% (108 sera), respectively. Totally, the seroprevalence of the first year was 15.8% and it increased rapidly to 25.8% in the second year. The positive rates of both sexes increased simultaneously with the significant ratio of males to females by 1.7-2.2 fold (P<0.05). In both myeons, 661 sera were collected every year and showed changes in optical density (OD) in 177 sera; newly found as positives in 73 persons (11.0%), negative conversion in 10 persons (1.5%), and maintained or increased in 94 persons (14.2%). This rapid increase in the prevalence of toxoplasmosis in Gangwha islands may be due to in part peculiar changes in the toxoplasmic environment of the islands and presumably the consumption of the pork bred domestically within the islands or imported from high endemic nations. It is necessary to find out symptomatic toxoplasmic patients and confirm the risk factors for further infection in the islands of Gangwha-gun.

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Development and Clinical Evaluation of a Rapid Serodiagnostic Test for Toxoplasmosis of Cats Using Recombinant SAG1 Antigen: Chom-Kyu Chong, Wooseog Jeong, Hak-Yong Kim, Dong-Jun An, Hye-Young Jeoung, Jeong-Eun Ryu, A-Ra Ko, Yong-Joo Kim, Sung-Jong Hong, Zhaoshou Yang, Ho-Woo Nam; Korean J Parasitol 2011;49(3):207-212.
Published online September 30, 2011; DOI: https://doi.org/10.3347/kjp.2011.49.3.207

Abstract
PDF

Rapid serodiagnostic methods for Toxoplasma gondii infection in cats are urgently needed for effective control of transmission routes toward human infections. In this work, 4 recombinant T. gondii antigens (SAG1, SAG2, GRA3, and GRA6) were produced and tested for the development of rapid diagnostic test (RDT). The proteins were expressed in Escherichia coli, affinity-purified, and applied onto the nitrocellulose membrane of the test strip. The recombinant SAG1 (rSAG1) showed the strongest antigenic activity and highest specificity among them. We also performed clinical evaluation of the rSAG1-loaded RDT in 182 cat sera (55 household and 127 stray cats). The kit showed 0.88 of kappa value comparing with a commercialized ELISA kit, which indicated a significant correlation between rSAG1-loaded RDT and the ELISA kit. The overall sensitivity and specificity of the RDT were 100% (23/23) and 99.4% (158/159), respectively. The rSAG1-loaded RDT is rapid, easy to use, and highly accurate. Thus, it would be a suitable diagnostic tool for rapid detection of antibodies in T. gondii-infected cats under field conditions.

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