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The Korean journal of parasitology 9건

  1. [국내논문]   Developmental surface ultrastructure of Macroorchis spinulosus in albino rats   피인용횟수: 1

    Hong, Sung-Jong (Department of Parasitology, Chung-Ang University College of Medicine ) , Woo, Ho-Chun (Department of Parasitology, College of Veterinary Medicine, Cheju National University ) , Kwon, Oh-Sil (Department of Parasitology, Chung-Ang University College of Medicine)
    The Korean journal of parasitology v.42 no.4 = no.132 ,pp. 151 - 157 , 2004 , 0023-4001 ,

    초록

    Developmental surface ultrastructure of Macroorchis spinulosus was studied by scanning electron microscopy. One-day-old juvenile fluke was leaf-shaped and bent ventrally. Body surface was covered densely with peg-like spines and with cobblestone-like cytoplasmic processes. Ciliated sensory papillae were concentrated around oral sucker. Several unciliated sensory papillae occurred equidistantly on oral sucker and acetabulum. The ciliated papillae appeared in two longitudinal lines symmetric bilaterally on dorsal surface. On adult flukes, tegumantal spines became wider in middle of the body surface. The cytoplasmic processes differentiated into more fine velvety form. It is likely that the differentiated fine cytoplasmic processes are an increased absorptive surface to adult M. spinulosus. It is suggested that single pointed tegumental spines on anterior half of the body may be supportive for this fluke to migration.

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  2. [국내논문]   Codon usage and bias in mitochondrial genomes of parasitic platyhelminthes  

    Le, Thanh-Hoa (Molecular Parasitology Laboratory, Australian Centre for International and Tropical Health and Nutrition, The Queensland Institute of Medical Research and The University of Queensland, Institute of Biotechnolog(IBT) ) , Mcmanus, Donald-Peter (Molecular Parasitology Laboratory, Australian Centre for International and Tropical Health and Nutrition, The Queensland Institute of Medical Research and The University of Queensland ) , Blair, David (School of Tropical Biology, James Cook University)
    The Korean journal of parasitology v.42 no.4 = no.132 ,pp. 159 - 167 , 2004 , 0023-4001 ,

    초록

    Sequences of the complete protein-coding portions of the mitochondrial (mt) genome were analysed for 6 species of cestodes (including hydatid tapeworms and the pork tapeworm) and 5 species of trematodes (blood flukes and liver- and lung-flukes). A near-complete sequence was also available for an additional trematode (the blood fluke Schistosoma malayensis). All of these parasites belong to a large flatworm taxon named the Neodermata. Considerable variation was found in the base composition of the protein-coding genes among these neodermatans. This variation was reflected in statistically-significant differences in numbers of each inferred amino acid between many pairs of species. Both convergence and divergence in nucleotide, and hence amino acid, composition was noted among groups within the Neodermata. Considerable variation in skew (unequal representation of complementary bases on the same strand) was found among the species studied. A pattern is thus emerging of diversity in the mt genome in neodermatans that may cast light on evolution of mt genomes generally.

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  3. [국내논문]   Organ-specific antigens of Clonorchis sinensis  

    Li, Shun-Yu (Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine and Institute of Endemic Diseases, Seoul National University Medical Research Center, Department of Parasitology, College of Medicine, Yanbian University ) , Chung, Byung-Suk (Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine and Institute of Endemic Diseases, Seoul National University Medical Research Center ) , Choi, Min-Ho (Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine and Institute of Endemic Diseases, Seoul National University Medical Research Center ) , Hong, Sung-Tae (Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine and Institute of Endemic Diseases, Seoul National University Medical Research Center)
    The Korean journal of parasitology v.42 no.4 = no.132 ,pp. 169 - 174 , 2004 , 0023-4001 ,

    초록

    This study was carried out to find out specific proteins from different organs of Clonorchis sinensis. Crude extract, organ-specific and excretory-secretory (ES) proteins were analyzed by immunoblot with infected human sera. The bands of 7- and 17 -kDa were main component of intestinal fluid and ES protein and commonly found in all organ-specific proteins. The 17-kDa protein was observed from ES antigen, intestinal fluid, eggs and sperms, 26- and 28-kDa proteins were from the uterus, vitellaria, and ovary, and 34-, 37-, 43- and 50-kDa proteins were mainly from the testis and sperms. Serum of mice immunized with sperms reacted to the 50-kDa protein by immunoblotting and immunohistochemical staining showed a positive reaction at the seminal receptacle and seminiferous tubule. The present results show that the 7-kDa protein is a common antigen of every part or organ of C. sinensis, but different organs express their specific antigenic protein bands.

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  4. [국내논문]   Effects of iNOS inhibitor on IFN-γ production and apoptosis of splenocytes in genetically different strains of mice infected with Toxoplasma gondii  

    Kang, Ki-Man (Department of Internal Medicine, Sun General Hospital, Daejeon 301-070, Korea. ) , Lee, Gye-Sung (Department of Internal Medicine, Sun General Hospital, Daejeon 301-070, Korea. ) , Lee, Jae-Ho (Department of Pediatrics, College of Medicine, Chungnam National University, Daejeon 301-131, Korea. ) , Choi, In-Wook (Department of Parasitology, College of Medicine, Chungnam National University, Daejeon 301-131, Korea. ) , Shin, Dae-Whan (Department of Parasitology, College of Medicine, Chungnam National University, Daejeon 301-131, Korea. ) , Lee, Young-Ha (Department of Parasitology, College of Medicine, Chungnam National University, Daejeon 301-131, Korea.)
    The Korean journal of parasitology v.42 no.4 = no.132 ,pp. 175 , 2004 , 0023-4001 ,

    초록

    This study was carried out to find out specific proteins from different organs of Clonorchis sinensis. Crude extract, organ-specific and excretory-secretory (ES) proteins were analyzed by immunoblot with infected human sera. The bands of 7- and 17 -kDa were main component of intestinal fluid and ES protein and commonly found in all organ-specific proteins. The 17-kDa protein was observed from ES antigen, intestinal fluid, eggs and sperms, 26- and 28-kDa proteins were from the uterus, vitellaria, and ovary, and 34-, 37-, 43- and 50-kDa proteins were mainly from the testis and sperms. Serum of mice immunized with sperms reacted to the 50-kDa protein by immunoblotting and immunohistochemical staining showed a positive reaction at the seminal receptacle and seminiferous tubule. The present results show that the 7-kDa protein is a common antigen of every part or organ of C. sinensis, but different organs express their specific antigenic protein bands.

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  5. [국내논문]   Effects of iNOS inhibitor on $IFN-{\gamma}$ production and apoptosis of splenocytes in genetically different strains of mice infected with Toxoplasma gondii   피인용횟수: 1

    Kang, Ki-Man (Department of Internal Medicine, Sun General Hospital ) , Lee, Gye-Sung (Department of Internal Medicine, Sun General Hospital ) , Lee, Jae-Ho (Department of Pediatrics, College of Medicine, Chungnam National University ) , Choi, In-Wook (Department of Parasitology, College of Medicine, Chungnam National University ) , Shin, Dae-Whan (Department of Parasitology, College of Medicine, Chungnam National University ) , Lee, Young-Ha (Department of Parasitology, College of Medicine, Chungnam National University)
    The Korean journal of parasitology v.42 no.4 = no.132 ,pp. 175 - 183 , 2004 , 0023-4001 ,

    초록

    To evaluate the role of nitric oxide (NO) in $IFN-{\gamma}$ production and apoptosis of splenocytes in genetically different strains of mice with toxoplasmosis, BALB/c (a toxoplasmosis resistant strain) and C57BL/6 (a toxoplasmosis susceptible strain) mice were infected with Toxoplasma gondii cysts orally and subsequently injected intraperitoneally with aminoguanidine, an iNOS inhibitor (AG; 35 mg/kg per mouse daily for 14 days). When BALB/c or C57BL/6 mice were infected with T. gondii without AG treatment, number of brain cysts, NO and IFN-y production by splenocytes, and percentages of apoptotic splenocytes were increased compared to uninfected control mice without AG treatment. AG treatment increased the number of brain cysts, and reduced NO and $IFN-{\gamma}$ production in T. gondii-infected C57BL/6 mice. In contrast, in T. gondii-infected BABL/c mice, the number of brain cysts, and NO and $IFN-{\gamma}$ production of splenocytes was not altered by treatment with AG. However, the percentages of apoptotic splenocytes in T. gondii-infected BALB/c or C57BL/6 mice were not affected by AG treatment. These results suggest that NO modulates $IFN-{\gamma}$ production in T. gondii-infected C57BL/6 mice, and that NO is involved in mediating a protective response in toxoplasmosis susceptible, but not resistant, mice strain during acute infection.

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  6. [국내논문]   Influence of calcium ion on host cell invasion and intracellular replication by Toxoplasma gondii   피인용횟수: 6

    Song, Hyun-Ouk (Department of Parasitology and Institute of Biomedical Science, Hanyang University College of Medicine ) , Ahn, Myoung-Hee (Department of Parasitology and Institute of Biomedical Science, Hanyang University College of Medicine ) , Ryu, Jae-Sook (Department of Parasitology and Institute of Biomedical Science, Hanyang University College of Medicine ) , Min, Duk-Young (Department of Parasitology and Institute of Biomedical Science, Hanyang University College of Medicine ) , Joo, Kyoung-Hwan (Department of Parasitology, Korea University College of Medicine ) , Lee, Young-Ha (Department of Parasitology, Chungnam National University College of Medicine)
    The Korean journal of parasitology v.42 no.4 = no.132 ,pp. 185 - 193 , 2004 , 0023-4001 ,

    초록

    Toxoplasma gondii is an obligate intracellular protozoan parasite, which invades a wide range of hosts including humans. The exact mechanisms involved in its invasion are not fully understood. This study focused on the roles of $Ca^{2+}$ in host cell invasion and in T. gondii replication. We examined the invasion and replication of T. gondii pretreated with several calcium modulators, the conoid extrusion of tachyzoites. Calmodulin localization in T. gondii were observed using the immunogold method, and $Ca^{2+}$ levels in tachyzoites by confocal microscopy. In light microscopic observation, tachyzoites co-treated with A23187 and EGTA showed that host cell invasion and intracellular replication were decreased. The invasion of tachyzoites was slightly inhibited by the $Ca^{2+}$ channel blockers, bepridil and verapamil, and by the calmodulin antagonist, calmidazolium. We observed that calcium saline containing A23187 induced the extrusion of tachyzoite conoid. By immunoelectron microscopy, gold particles bound to anti-calmodulin or anti-actin mAb, were found to be localized on the anterior portion of tachyzoites. Remarkably reduced intracellular $Ca^{2+}$ was observed in tachyzoites treated with BAPTA/AM by confocal microscopy. These results suggest that host cell invasion and the intracellular replication of T. gondii tachyzoites are inhibited by the calcium ionophore, A23187, and by the extracellular calcium chelator, EGTA.

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  7. [국내논문]   Immunization effect of recombinant P27/30 protein expressed in Escherichia coli against the hard tick Haemaphysalis longicornis (Acari: Ixodidae) in rabbits  

    You, Myung-Jo (College of Veterinary Medicine and Bio-Safety Research Center, Chonbuk National University)
    The Korean journal of parasitology v.42 no.4 = no.132 ,pp. 195 - 200 , 2004 , 0023-4001 ,

    초록

    We investigated the induction of resistance to Haemaphysalis longicornis infestation in rabbits that had been immunized with recombinant H. longicornis P27/30 protein. The success of immunological control methods is dependent upon the use of potential key antigens as tick vaccine candidates. Previously, we cloned a gene encoding 27 kDa and 30 kDa proteins (P27/30) of H. longicornis, and identified P27/30 as a troponin I-like protein. In this study, rabbits that were immunized with recombinant P27/30 expressed in Escherichia coli showed the statistically significant longer feeding duration for larval and adult ticks (P

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  8. [국내논문]   Status of intestinal parasite infections among children in Bat Dambang, Cambodia   피인용횟수: 2

    Park, Seung-Kyu (Department of Parasitology and Institute of Basic Medical Science, Wonju College of Medicine, Yonsei University ) , Kim, Dong-Heui (Department of Biology, Wonju College of Medicine, Yonsei University ) , Deung, Young-Kun (Department of Biology, Wonju College of Medicine, Yonsei University ) , Kim, Hun-Joo (Department of Neurosurgery, Wonju College of Medicine, Yonsei University ) , Yang, Eun-Ju (Department of Biomedical Laboratory Science and Institute of Health Science, College of Health Science, Yonsei University ) , Lim, Soo-Jung (Department of Biomedical Laboratory Science and Institute of Health Science, College of Health Science, Yonsei University ) , Ryang, Yong-Suk (Department of Biomedical Laboratory Science and Institute of Health Science, College of Health Science, Yonsei University ) , Jin, Dan (Department of Microbiology, Wonju College of Medicine, Yonsei University ) , Lee, Kyu-Jae (Department of Parasitology and Institute of Basic Medical Science, Wonju College of Medicine, Yonsei University)
    The Korean journal of parasitology v.42 no.4 = no.132 ,pp. 201 - 203 , 2004 , 0023-4001 ,

    초록

    A survey was conducted to determine the extent of intestinal parasite infection in Bat Dambang, Cambodia in March 2004. A total of 623 fecal specimens was collected from kindergarten and schoolchildren and examined using the formalin-ether sedimentation technique. The overall infection rate of intestinal parasites was 25.7% (boys, 26.2%; girls, 25.1%), and the infection rates of intestinal helminthes by species were as follows: Echinostoma sp. 4.8%, hookworm 3.4%, Hymenolepis nana 1.3%, and Rhabditis sp. 1.3%. The infection rates of intestinal protozoa were; Entamoeba coli 4.8%, Giardia lamblia 2.9%, Iodamoeba butschlii 1.4%, Entamoeba polecki 1.1 %, and Entamoeba histolytica 0.8%. There were no egg positive cases of Ascaris lumbricoides or Trichuris trichiura. All children infected were treated with albendazole, praziquantel, or metronidazole according to parasite species. The results showed that intestinal parasites are highly endemic in Bat Dambang, Cambodia.

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  9. [국내논문]   Ultrastructural observation of human neutrophils during apoptotic cell death triggered by Entamoeba histolytica   피인용횟수: 1

    Sim, Sco-Bo (Department of Parasitology, Institute of Tropical Medicine, and Brain Korea 21 for Medical Science, Yonsei University College of Medicine ) , Kim, Kyeong-Ah (Department of Parasitology, Institute of Tropical Medicine, and Brain Korea 21 for Medical Science, Yonsei University College of Medicine ) , Yong, Tai-Soon (Department of Parasitology, Institute of Tropical Medicine, and Brain Korea 21 for Medical Science, Yonsei University College of Medicine ) , Park, Soon-Jung (Department of Parasitology, Institute of Tropical Medicine, and Brain Korea 21 for Medical Science, Yonsei University College of Medicine ) , Im, Kyung-Il (Department of Parasitology, Institute of Tropical Medicine, and Brain Korea 21 for Medical Science, Yonsei University College of Medicine ) , Shin, Myeong-Heon (Department of Parasitology, Institute of Tropical Medicine, and Brain Korea 21 for Medical Science, Yonsei University College of Medicine)
    The Korean journal of parasitology v.42 no.4 = no.132 ,pp. 205 - 208 , 2004 , 0023-4001 ,

    초록

    Neutrophils are important effector cells against protozoan extracellular parasite Entamoeba histolytica, which causes amoebic colitis and liver abscess in human beings. Apoptotic cell death of neutrophils is an important event in the resolution of inflammation and parasite's survival in vivo. This study was undertaken to investigate the ultrastructural aspects of apoptotic cells during neutrophil death triggered by Entamoeba histolytica. Isolated human neutrophils from the peripheral blood were incubated with or without live trophozoites of E. histolytica and examined by transmission electron microscopy (TEM). Neutrophils incubated with E. histolytica were observed to show apoptotic characteristics, such as compaction of the nuclear chromatin and swelling of the nuclear envelop. In contrast, neutrophils incubated in the absence of the amoeba had many protrusions of irregular cell surfaces and heterogenous nuclear chromatin. Therefore, it is suggested that Entamoeba-induced neutrophil apoptosis contribute to prevent unwanted tissue inflammation and damage in the amoeba-invaded lesions in vivo.

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