• Parasites, Hosts and Diseases
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• 제31권4호
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• pp.363-370
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• 1993

Toxoprqsmagonnii의 강독주(RH주) 혹은 약독주(Beverley주)를 마우스에 감염시킴과 동시에 trimethoprim-sulfamethoxazole(TMP-SMZ)을 투여하여 Toxoplasma 감염 마우스에 있어 서 TMP-SMZ의 감염 예방효과를 마우스의 생존기간과 생존율. 면역혈청학적 반응 및 뇌조직내 씨스트의 수로 평가한 후 감염대조군 및 spiramycin 투여군과 비교하였다. T. gondii의 RH주를 감염시킨 마우스(마우스당 $1{\;}{\times}{\;}10^5$개의 tachyzoite를 감염)에 TMP-SMZ을 투여시 마우스의 생존기간은 감염대조군이나 spiramycin 투여군보다 유의하게 증가하였으며(p < 0.01), TMP-SMZ의 투여량을 증가시킴에 따라 생존기간 및 생존율이 증가하였고 마우스당 24 mg/day 이상 15일간 투여시 100% 생존하였다. T. gondii의 Beverley주를 감염시킨 마우스(마우스당 10개의 씨스트를 감염)의 혈청내 IgG 및 IgM 항체가는 TMP-SMZ 투여시 유의하게 감소하였으며(p < 0.05) TMP-SMZ을 마우스당 24 mg/day 이상 투여시 뇌조직내에서 씨스트를 발견할 수 없었다. 그러나 spiramycin 투여군은 감염대조군과 유사한 항체가를 보였으며 감염 후 20일부터 씨스트가 발견되었다 이상의 성적으로 보아 TMP-SMZ은 T. gondii의 강독주나 약독주 감염 마우스에 투여시 감염 예방효과가 있었다.

• Parasites, Hosts and Diseases
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• 제56권4호
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• pp.325-334
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• 2018

Toxoplasma gondii is an apicomplexan zoonotic protozoan parasite that infects most species of warm-blooded animals, including humans. The heavy incidence and severe or lethal damage caused by T. gondii infection clearly indicate a need for the development of an effective vaccine. T. gondii GRA8 is a member of the dense granules protein family and is used as a marker of acute infection. In the present study, we evaluated the protective immunity induced by DNA vaccination based on a recombinant eukaryotic plasmid, pDsRed2-GRA8, against acute toxoplasmosis in mice. BALB/c mice were intramuscularly immunized with the pDsRed2-GRA8 plasmid and then challenged by infection with the highly virulent GFP-RH strain of T. gondii. The specific immune responses and protective efficacy against T. gondii of this vaccine were analyzed by measuring cytokine and serum antibody titers, splenocyte proliferation assays, and the survival times of mice after challenge. Our results showed that mice immunized with pDsRed2-GRA8 demonstrated specific humoral and cellular responses, induced higher IgG antibody titers with predominant IgG2a production; increased levels of IL-10, IL-12 (p70), $IFN-{\gamma}$, $TNF-{\alpha}$, and splenocyte proliferation; and prolonged survival times compared to those of control mice. The present study showed that DNA immunization with pDsRed2-GRA8 induced humoral and cellular immune responses, and all immunized mice showed greater Th1-type immune responses and longer survival times than those of control mice. These results indicated that T. gondii GRA8 DNA immunization induces a partial protective effect against acute toxoplasmosis.

• 약학회지
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• 제52권5호
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• pp.394-401
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• 2008

In order to access the suppressive effects of piroxicam (PX) and hydrolyzed products of Scutellariae Radix (PSH) on arthritis, we investigated whether PSH gel could suppress the progression of collagen-induced arthritis. PX, one of nonsteroidal anti-inflammatory drugs has been used in the systemic and topical treatment in a variety of inflammatory conditions. Scutellariae Radix, one of the herbal medicines, was used for the purpose of anti-inflammatory and anti-bacterials. For the purpose of transdermal absorption of the hydrogel preparations, two classes of hydrogels (PX, PSH) were formulated with carbomer 940, diethylene glycol monoethyl ether, polyethylene glycol-8-glyceryl caprylate/caprate and triethanolamine. In carrageenan-induced edema in rat hind paws, inhibition of foot swelling was more increased in PSH than PX hydrogel. Rheumatoid factors including serum IgG, IgM and collagen specific antibody were present much lower in PSH gel treated mice than control. Histological examination revealed that PSH hydrogel inhibited infiltration of inflammatory cells into affected paw joint, compared with control. The PSH hydrogel would be a suitable preparation to increase transdermal treatment for anti-inflammatory effects on collagen-induced arthritis.

• Parasites, Hosts and Diseases
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• 제47권2호
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• pp.125-130
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• 2009

To figure out the epidemiological status and relevance with other diseases in toxoplasmosis, we checked serum IgG antibody titers of 1,265 patients and medical records of seropositive patients. Seropositive rates were 6.6% by latex agglutination test (LAT) and 6.7% by ELISA. No significant differences were detected between sexes and age groups. The peak seroprevalence was detected in the 40-49-year-old age group. According to clinical department, Toxoplasma-positive rates were high in patients in psychiatry, ophthalmology, health management, emergency medicine, and thoracic surgery. Major coincidental diseases in seropositive cases were malignant neoplasms, diabetes mellitus, arthritis, chronic hepatitis B, chronic renal diseases, schizophrenia, and acute lymphadenitis, in the order of frequency. In particular, some patients with chronic hepatitis B and malignant neoplasms had high antibody titers. These results revealed that the seroprevalence of toxoplasmosis in a general hospital-based study was similar to that in a community-based study, and T. gondii seropositivity may be associated with neoplasms, diabetes, and other chronic infections.

• Journal of Microbiology and Biotechnology
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• 제32권10호
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• pp.1335-1343
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• 2022

COVID-19 is an emerging disease that poses a severe threat to global public health. As such, there is an urgent demand for vaccines against SARS-CoV-2, the virus that causes COVID-19. Here, we describe a virus-like nanoparticle candidate vaccine against SARS-CoV-2 produced by an E. coli expression system. The fusion protein of a truncated ORF2-encoded protein of aa 439~608 (p170) from hepatitis E virus CCJD-517 and the receptor-binding domain of the spike protein from SARS-CoV-2 were expressed, purified and characterized. The antigenicity and immunogenicity of p170-RBD were evaluated in vitro and in Kunming mice. Our investigation revealed that p170-RBD self-assembled into approximately 24 nm virus-like particles, which could bind to serum from vaccinated people (p < 0.001) and receptors on cells. Immunization with p170-RBD induced the titer of IgG antibody vaccine increased from 14 days post-immunization and was significantly enhanced after a booster immunization at 28 dpi, ultimately reaching a peak level on 42 dpi with a titer of 4.97 log₁₀. Pseudovirus neutralization tests showed that the candidate vaccine induced a strong neutralizing antibody response in mice. In this research, we demonstrated that p170-RBD possesses strong antigenicity and immunogenicity and could be a potential candidate for use in future SARS-CoV-2 vaccine development.

• 대한임상검사과학회지
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• 제54권3호
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• pp.173-178
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• 2022

The majority of the children experience milder coronavirus disease 2019 (COVID-19) symptoms. Children represent a significant source of community transmission. Children under 18 years of age account for an estimated 4.8% of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infections globally. However, no conclusive statements pertaining to the multi-fold aspects of the virus in children could be drawn due to the lower prevalence of pediatric cases. The present study was conducted to identify the indirect impact of SARS-CoV-2 infections on developing herd immunity among children in the age group 3 to 18 years by investigating their antibody levels. In the study, 240 children aged 3~18 years were recruited by the Department of Pediatrics, Government Medical College and Hospital, Amritsar, India, and quantification of the antibodies was performed at the Viral Research and Diagnostic Laboratory (VRDL), Government Medical College (GMC), Amritsar, India. Out of the 240 serum samples, 197 (82.08%) showed seropositivity, while 43 (17.92%) were seronegative. When stratified, it was observed that in the age group 3~6 years, 22.33% of children were found to have anti-SARS-CoV-2 antibodies while in the age groups 7~10 years, 11~14 years, and 15~18 years, respectively, 37.06%, 30.46%, and 10.15% were seropositive. Although there was seroconversion among children which was useful for predicting the next wave, no differences in seropositivity were observed between adults and children.

• Parasites, Hosts and Diseases
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• 제32권2호
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• pp.85-92
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• 1994

스파르가눔 감염 환자에 대하여 혈청학적으로 특이항체검사를 실시할 경우 그 민감도와 특이도가 높다는 것은 이미 알려진 바와 같다. 그러므로 특이항체 양성율을 이용할 경우 무증상 정상인 집단이나 특정 집단에서의 스파르가눔 감염 상태를 간접적으로 관찰할 수 있다 이 연구는 우리나라 정상 성인 및 간질(간질) 환자의 혈청을 수집하고. 효소면역측정법으로 혈청내 항스파르가눔 항체. 항유구낭미충 항체 및 항폐흡충 항체가를 동시에 측정하고. 항스파르가눔 항체양성자 중 항유구낭미충 항체 및 항폐흡충 항체와 교차반응한 예를 제외하고 오로지 항스파르가눔 항체가만 양성범위인 사람을 양성으로 하는 방법으로 양성자를 조사하였다 1987년 2월부터 1990년 9월까지 중앙의대 부속병원. 한국건강관리협회 전국 각 지부 검사소 및 제주의료원에 신체검사를 목적으로 내원한 무증상 성인 850명의 혈청을 무작위로 선정하여 정상 성인 조사 대상자로 하였고 전국 장미회 108 개 지부중 28개 지부에 등록한 간질 환자중 무작위로 2,667명을 조사대상자로 선정하였다. 항스파르가눔 항체의 양성 반응을 흡광도 0.22또는 그 이상으로 하였을 때. 항체양성율은 정상 성인군에서 1.9% (1990년 전국 시도별 인구로 표준화하면 1.7%) 간질환자군에서 2.5% (표준화하였을 때 2.3%)이었다. 항체양성율은 남자에서 30세 이상 연령군에서 높아 환자 증례를 기초로 조사한 기존 역학조사 자료와 일치하였다. 시도별로는 강원도와 전라남도의 대상자에서 항체양성율이 높았고 특히 강원도의 대상자에서는 항체가(흡광도)가 매우 높은 양성자의 비율이 높았다. 항체양성율을 기초로 간질에 대한 스파르가눔 감염의 상대위험도(odds ratio(교차비)로 표현)는 1.32로서 스파르가눔 감염은 유구낭미충 감염 (교차비 1.94) 에 비하여 낮았다.

• 동의생리병리학회지
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• 제21권1호
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• pp.39-49
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• 2007

Rheumatoid arthritis is an autoimmune disease involving multiple joint. In order to access the suppressive effects of JTT on rheumatoid arthritis and it's effects on immune system we investigated whether JTT could suppress the disease progression of collagen-induced arthritis. DBA/1 mice were immunized with bovine type II collagen. After a second collagen immunization, mice were treated with DW, JTT (200 or 400 mg/kg) or methotrexate (MTX, 30 mg/kg) as a positive control. Oral administration of JTT significantly suppressed the progression of CIA, which extend is comparable to that of MTX. Histological examination reveled that JTT inhibited infiltration of inflammatory cells into affected paw joint and bone erosion and cartilage destruction were greatly reduced compared with control. Total cell number of spleen, lymph node and peripheral blood were significantly reduced. The absolute number of CD19$^+$, CD3$^+$/CD69$^+$, CD4$^+$/CD25$^+$ cell in spleen from JTT treated mice were significantly decreased. The absolute number of CD19$^+$, CD3$^+$, CD3$^+$/CD69$^+$, CD4$^+$, CD4$^+$/CD25$^+$ CD8$^+$, CD49b, CD3/CD49b cells in draining lymph node were significantly increased compared with control. In peripheral blood mononuclear cells of JTT treated mice, the absolute number of CD4$^+$, CD4$^+$/CD25$^+$, CD3$^+$/CD69$^+$ cells were significantly decreased compared with control, while that of CD49b$^+$ was slightly increased. Infiltration of CD3$^+$ cells and CD11b$^+$/Gr-1$^+$ cells into paw joint was significantly reduced in JTT treated mice. The levels of pathologic cytokines including TNF-a and IL-6 in serum were significantly decreased by oral treatment with JTT The levels of IFN-g in the culture supernatant of splenocyte stimulated with CD3$^+$/CD28$^+$ or collagen were dramatically decreased, while the levels of IL-4 was increased under CD3$^+$/CD28$^+$ or collagen stimulation. Rheumatoid factors including IgG, IgM and collagen specific antibody were present much lower in the serum of JTT treated mice than control. Taken together, JTT has suppressive effects on rheumatoid arthritis by modulating immune system, and has potential to use anti-rheumatic arthritic agent in human.

• 한국동물위생학회지
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• 제31권3호
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• pp.331-338
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• 2008

The study was carried out to evaluate the diagnostic efficacy of the tube agglutination test (TAT), enzyme-linked immunosorbent assay (ELISA) and the 2-Mercaptoethanol agglutination test (2-MAT) to detect human brucellosis patients in Korea. We examined 87 serum samples of people in the rural farm areas where bovine brucellosis had been reported. People in this study were divided into seven groups- farmers and their families, veterinarians, veterinary quarantine workers, livestock health control officers, artificial inseminators, livestock traders and healthy control individuals. Among 87 people, 65 were males and 22 were females ranging in age from 13 to 72 years. Of 87 serum samples, ELISA detected 21.84%, TAT detected 11.50% and 2-MAT detected 8.05% Brucella positive sera. Brucella specific IgG ELISA antibody titer was recorder higher in the individuals between the ages of 50 and 65 years. The highest prevalence rate of brucellosis(29.4%) was recorded in the cattle farmers and their family members followed by quarantine veterinary office workers (25%) and practicing veterinarians 01.1%). The majority of the Brucella sero-positive individuals in this study had a history of direct contact with animals.

• 한국식품영양과학회지
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• 제24권6호
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• pp.837-842
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• 1995

고추가루 첨가 식이가 체액성 면역기능에 미치는 영향을 조사하였다. 실험동무로 흰쥐를 사용하여 대조군과 2%, 5%, 10% 고추가루 첨가 식이군을 설정한 후 27일간 실험식이로 사육하였다. 실험종료 10일 전에 각군의 흰쥐를 면양적혈구로 세차례 면역시킨 후 항체생성 세포수 및 혈청 중 항체 농도 등 체액성 면역기능을 중심으로 조사하였다. 그 결과, 대조군에 비해 고추가루 첨가 식이군의 항체 생성 세포수, 적혈구 응집반응 및 혈청중 항체 농도가 높은 것으로 나타났으며, 또한 이때 고추가루 첨가식이군의 각 장기조직 중 AsA 함량은 대조군에 비해 높은 것으로 나타났다. 이들 결과로 보아, 고추성분은 체액성 면역기능의 활성화에 기여하는 물질을 함유하고 있을 뿐만이 아니라, AsA의 공급효과가 뛰어난 것이 확인되었다.