• Parasites, Hosts and Diseases
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• 제52권4호
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• pp.345-353
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• 2014

Babesia gibsoni is an intraerythrocytic apicomplexan parasite that causes piroplasmosis in dogs. B. gibsoni infection is characterized clinically by fever, regenerative anemia, splenomegaly, and sometimes death. Since no vaccine is available, rapid and accurate diagnosis and prompt treatment of infected animals are required to control this disease. Over the past decade, several candidate molecules have been identified using biomolecular techniques in the authors' laboratory for the development of a serodiagnostic method, vaccine, and drug for B. gibsoni. This review article describes newly identified candidate molecules and their applications for diagnosis, vaccine production, and drug development of B. gibsoni.

• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2005년도 생물공학의 동향(XVI)
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• pp.200-200
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• 2005

• 수산해양교육연구
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• 제26권6호
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• pp.1366-1372
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• 2014

본 연구의 목적은 해산어류와 갑각류에 심각한 위해를 끼치고 있는 V. harveyi에 대한 백신개발을 위하여 V. harveyi 백신생산에 적합한 배양배지를 탐색하고 적정 투여량을 조사하며 또한 S. parauberis 백신과 혼합백신의 형태로 투여시 백신효능에 대해 조사하는 것이다. 이를 위하여 2-2'-dipyridyl이 첨가되거나 첨가되지 않은 TSB와 BHIB에 배양 후 FKC 백신을 제작한 후 넙치에 투여하여 응집항체가의 생산변화와 공격실험에서의 상대생존율을 비교분석하였다. 또한 V. harveyi 백신의 적정 투여량을 정하기 위하여 어체중 kg 당 10mg 또는 20mg을 투여하여 면역반응을 비교하였으며 S. parauberis 백신을 혼합한 백신을 투여한 후 면역반응을 비교하였다. 그 결과 2-2'-dipyridyl이 들어간 TSB와 BHIB에 배양된 V. harveyi 백신은 응집항체형성과 방어력에서 차이를 보이지 않았다. 또한 백신 투여량에 따른 응집항체가에 있어서 큰 차이는 없었으나 어체중 kg 당 10mg을 투여한 실험구가 조금 높은 방어력을 나타내었다. S. parauberis 백신과 혼합한 dual 백신을 투여시 V. harveyi 백신만을 단독으로 투여했을 때와 비교해 방어력이 현저히 증가하였으며 특히 어체중 kg당 두가지 백신을 각각 10mg씩 혼합하여 투여한 실험구에서는 28일동안 폐사가 전혀 일어나지 않아 백신효능이 매우 뛰어난 것으로 나타났다. 결론적으로 넙치를 위한 V. harveyi 백신을 개발할 때는 2-2'-dipyridyl가 첨가된 TSB에 배양 후 제작된 V. harveyi 백신을 어체중 kg당 10mg의 투여량으로서 S. parauberis 백신과 혼합투여하는 것이 효능과 경제적인 면에서 바람직하다고 생각된다.

• BMB Reports
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• 제47권4호
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• pp.215-220
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• 2014

Molecular-targeted therapy has gained attention because of its high efficacy and weak side effects. Previously, we confirmed that transmembrane 4 superfamily member 5 protein (TM4SF5) can serve as a molecular target to prevent or treat hepatocellular carcinoma (HCC). We recently extended the application of the peptide vaccine, composed of CpG-DNA, liposome complex, and TM4SF5 peptide, to prevent colon cancer in a mouse model. Here, we first implanted mice with mouse colon cancer cells and then checked therapeutic effects of the vaccine against tumor growth. Immunization with the peptide vaccine resulted in robust production of TM4SF5-specific antibodies, alleviated tumor growth, and reduced survival rate of the tumor-bearing mice. We also found that serum levels of VEGF were markedly reduced in the mice immunized with the peptide vaccine. Therefore, we suggest that the TM4SF5-specific peptide vaccine has a therapeutic effect against colon cancer in a mouse model.

• 대한수의학회지
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• 제53권1호
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• pp.43-48
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• 2013

Commercial bivalent killed Salmonella vaccine Salenvac-T has been used in several countries in order to prevent salmonellosis with Salmonella enterica serovars Enteritidis (SE) and Typhimurium (ST) in poultry. However, this vaccine has not been used in poultry farms in South Korea. In this study, we evaluated the efficacy of Salenvac-T vaccine to protect against the challenge of virulent SE and ST, and the effect of the vaccine on egg production and mortality in layer hens. The colonization of liver, spleen and cecum with challenged SE and ST was reduced in vaccinated chickens compared with that of unvaccinated control group. The twice vaccination with Salenvac-T induced elevated antibody responses against both SE and ST detected by enzyme-linked immunosorbent assay (ELISA). The higher average hen-day production was observed in the vaccinated layer hens than in the unvaccinated layer hens without significance. The average mortality was lower in the vaccinated layer hens during the experiment period. The antibody responses to both SE and ST were persistently detected in the vaccinated layers. In summary, vaccination with Salenvac-T reduces colonization of internal organs and induces good antibody responses, thereby results in higher performance and lower egg contamination with SE and ST in layer hens.

• 대한수의학회지
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• 제39권5호
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• pp.1028-1032
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• 1999

Alpha toxin of S aureus has cytolytic activity respectively. This antigen has been received the most attention since it is a major virulence factor in pathogenesis of staphylococcal mastitis. Thus, alpha toxin has been focused as potential candidate of vaccine to minimize mastitis in cows. The purpose of this study was to develop a simple, efficient production and purification methods of sufficient amount of alpha toxin antigen from S aureus. Alpha toxin production measured by hemolytic activity was the highest at 18 hrs postinoculation in yeast extract culture medium supplemented with thiamine, nicotinic acid and casamino acid. Alpha toxin was purified by ammonium sulfate precipitation (65%) and ultrafiltration. Molecular weight of the toxin was 33 kDa in the analysis with SDS-PAGE. Conclusionally, when alpha toxin was included in the vaccine, the optimal harvest time of alpha toxin was at 18 hrs after inoculation in yeast extract medium supplemented with thiamine and nicotinic acid.

• Journal of Microbiology and Biotechnology
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• 제19권1호
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• pp.108-112
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• 2009

A simplified method for the purification of cholera toxin was developed. The 569B strain of Vibrio cholerae, a recognized hyper-producer of cholera toxin, was propagated in a bioreactor under conditions that promote the production of the toxin. The toxin was separated from the bacterial cells using 0.2-${\mu}m$ crossflow microfiltration, the clarified toxin was passed through the membrane into the permeate, and the bacterial cells were retained in the retentate. The 0.2-${\mu}m$ permeate was then concentrated 3-fold and diafiltered against 10 mM phosphate buffer, pH 7.6, using 30-kDa crossflow ultrafiltration. The concentrated toxin was loaded onto a cation exchange column, the toxin was bound to the column, and most of the impurities were passed unimpeded through the column. The toxin was eluted with a salt gradient of phosphate buffer, pH 7.0, containing 1.0 M NaCl. The peak containing the toxin was assayed for cholera toxin and protein and the purity was determined to be 92%. The toxin peak had a low endotoxin level of $3.1\;EU/{\mu}g$ of toxin. The purified toxin was used to prepare antiserum against whole toxin, which was used in a $G_{M1}$ ganglioside-binding ELISA to determine residual levels of toxin in an oral inactivated whole-cell cholera vaccine. The $G_{M1}$ ganglioside-binding ELISA was shown to be very sensitive and capable of detecting as little as 1 ng/ml of cholera toxin.

• 미생물학회지
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• 제9권4호
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• pp.175-178
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• 1971

Because of the cases of Japanese Encephalitis(J.E.) were reported every year in Korea. We, Dong-A Pharmaceutical Co., Ltd., produced J.E. virus vaccine, with lower price, since 1970 in order to prevent ourselves from being infected by the disease. And inoculated the J.E. virus vaccine for the children with a great success. We are going to report several questions which brought about in producing the J.E. virus vaccine by alcohol precipitation, protamine sulfate treatment method. The results obtained were as folows ; 1) In process treated with 40% alcohol, we used to ethanol made in Germany, but it was too expensive to use it. As the result which we had studied about it, we were satisfied with J.E. virus vaccine which produced with alcohol made in Korea, and then, we treated with accurate specific gravity of 40% ethanol for the precipitation of the virus. And also, we knew that it was the best method to be treated it for 3hrs, $13^{\circ}C$. 2) When we treated with protamine sulfate (0.025mg/ml), we acquired the highest potent titer, and suited into purpose for the nitrogen concentration. 3) The filtration of the purified J.E. virus vaccine, in case of millipore filter paper of large pore size was not suitable for the sterility. Therefore the pore size less than 0.8.$\mu$ (AA filter paper) in millipore filter paper was very suitable. But it seemed to be important subhects that the smaller was the pore size, the lower was the potent titer.

• 대한수의학회지
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• 제55권4호
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• pp.241-246
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• 2015

To develop a live vaccine strain against fowl typhoid and paratyphoid caused by Salmonella serovar Gallinarum biovar Gallinarum (Salmonella Gallinarum) and Salmonella serovar Enteritidis (Salmonella Enteritidis), respectively, several nalidixic acid resistant mutants were selected from lipopolysaccharide (LPS) rough strains of Salmonella Gallinarum that escaped from fatal infection of a LPS-binding lytic bacteriophage. A non-virulent and immunogenic vaccine strain of Salmonella Gallinarum, SR2-N6, was established through in vivo pathogenicity and protection efficacy tests. SR2-N6 was highly protective against Salmonella Gallinarum and Salmonella Enteritidis and safer than Salmonella Gallinarum vaccine strain SG 9R in the condition of protein-energy malnutrition. Thus, SR2-N6 may be a safe and efficacious vaccine strain to prevent both fowl typhoid and paratyphoid.

• Asian-Australasian Journal of Animal Sciences
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• 제17권4호
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• pp.543-547
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• 2004

Newcastle disease vaccine (NDV)-loaded chitosan microspheres (NDV-CM) were prepared. Stimulatory effects of these NDV-CM on antibody response compared to free NDV were examined in vitro and in vivo. In vitro stimulation of macrophages with virus vaccine resulted in higher number of cells compared to saline-treated control. Both NDV and NDV-CM induced secretion of interleukin-1 (IL-1) in dose dependent manner and the secretion of IL-1 by NDV-CM was delayed compared to free NDV. Irrespective of vaccine formulation, NDV subunit antigen was not effective in preventing mortality of the birds after challenge. However, CM loaded with NDV made of whole viron had antibody responses and protection similar to those shown by ND-K, a commercial inactivated oilemulsion vaccine.