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Laboratory Animal Facilities

Hirotaka Kanuka, Professor and Director Tatsuya Sakurai, Assistant Professor

General Summary

The purpose of the Laboratory Animal Facilities (LAF) is to support in

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vivo research and to contribute to the development of basic and clinical medicine. In 2014, about 570 researchers were registered as users of the LAF. We undertake breeding of experimental animals and provide technical guidance to researchers in animal experimentation. In addi- tion, we performed the following studies to develop basic medical sciences, including laboratory animal science.

Research Activities

Studies of parasite

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vector and parasite

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host interactions of African trypanosomes African trypanosomiasis is a deadly protozoan disease of humans and animals. The dis- ease is caused by African trypanosomes, which are transmitted by tsetse flies (Glossina spp.). To adjust to the mammalian host and insect vector environments, the parasite has a complicated lifecycle involving developmental stages. The lifecycle stage developments of Trypanosoma congolense, the cause of animal African trypanosomiasis, are reproduc- ible in vitro. Taking advantage of this in vitro culture system, we are seeking targets to develop novel methods of controlling this disease. We are now studying molecular mech- anisms underlying adhesion of parasite cells to host or tsetse tissues and lifecycle stage developments that are essential biological processes for the parasite to be transmitted.

Based on the results of proteome and biochemical analyses, the characterization of mole- cules predicted to be involved in signal transduction or those expressed on the parasite cell surface is being carried out.

Development of a novel immunological method of fecal occult blood testing for dogs and fecal occult blood trend in digestive diseases

With advances in veterinary medicine, the lives of companion animals, such as dogs and cats, have been extended. On the other hand, neoplastic diseases have also been increas- ing, and the development of screening methods has become an urgent task. The fecal occult blood test (FOBT) is a method for detecting in feces a small amount of blood that is undetectable with the naked eyes or under a microscope. The FOBT was originally developed as a screening test for alimentary canal tumors in human patients. However, the FOBT remains rarely used in veterinary medicine. In addition, little is known about its clinical significance, because the chemical FOBT is based on the peroxidase activity of hemoglobin. Thus, this chemical test had low sensitivity and specificity and was not suit- able for dogs, which live in various environments today. We developed a novel FOBT test using laser nephelometric immunoassay for dogs and investigated its performance. We demonstrated that our immunological FOBT method is independent of a dog’s diet. We

Research Activities 2014  The Jikei University School of Medicine

東京慈恵会 医科大学 電子署名者 : 東京慈恵会医科大学 DN : cn=東京慈恵会医科大学, o, ou, [email protected], c=JP 日付 : 2016.04.15 16:18:44 +09'00'

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also demonstrated that infection with a specific type of gastrointestinal parasite causes a significant increase of FOBT values in dogs and that this increase was significantly decreased with anthelmintic treatment. We are now evaluating cases of gastrointestinal cancer in dogs over time and investigating diagnostic value of our FOBT method.

Amino acid

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related host nutrition dynamics during Plasmodium infection

Malaria, a major parasitic disease affecting more than 200 million people, is caused by the Plasmodium parasite. Preventive and therapeutic methods against malaria need to be established because of the expansion of areas suitable for malaria vector mosquitoes with changes in global climate and the emergences of multiple drug

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resistant Plasmodium strains. Plasmodium parasites are incapable of most types of amino acid biosynthesis, depending on a part of the amino acid source on free amino acids in plasma. Thus, we are searching for the novel interactions between the parasite and host by performing the global analysis of amino acid composition in plasma (plasma aminogram analysis). With an in vivo murine model, we have shown that Plasmodium infection causes drastic altera- tion of plasma aminograms. Furthermore, the treatment of mice with food in which the amino acid composition has been modified significantly inhibited parasitemia. Currently, in an in vitro model, we are culturing the parasite with human sera from healthy individ- ual donors (more than 3,000 sera are given by the Japanese Red Cross Society) to find aminograms that have an inhibitory effect on the proliferation of Plasmodium falciparum.

Publications

Tamura Y, Ohta H, Kashiide T, Matsumoto J, Sakurai T, Yokoyama N, Morishita K, Naka­

mura K, Yamasaki M, Takiguchi M. Case report: protein

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losing enteropathy caused by Mesocestoides vogae (syn. M. corti) in a dog. Vet Parasitol. 2014; 205: 412

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5.

Nzelu CO, Gomez EA, Cáceres AG, Sakurai T, Martini

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Robles L, Uezato H, Mimori T, Katakura K, Hashiguchi Y, Kato H. Develop- ment of a loop

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mediated isothermal amplification method for rapid mass

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screening of sand flies for Leishmania infection. Acta Trop. 2014; 132: 1

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6.

Nzelu CO, Kato H, Puplampu N, Desewu K, Odoom S, Wilson MD, Sakurai T, Katakura K, Boakye DA. First detection of Leishmania tropica DNA and Trypanosoma species in Sergentomyia sand flies (Diptera: Psychodidae) from an outbreak area of cutaneous leishmaniasis in Ghana. PLoS Negl Trop Dis. 2014; 8: e2630.

Bawm S, Shimizu K, Hirota J, Tosa Y, Htun LL, Maw NN, Thein M, Kato H, Sakurai T, Katakura K. Molecular prevalence and genetic diversity of bovine Theileria orientalis in Myanmar.

Parasitol Int. 2014; 63: 640

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5.

Research Activities 2014  The Jikei University School of Medicine

参照

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