• Parasites, Hosts and Diseases
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• 제56권5호
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• pp.437-446
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• 2018

To investigate the prevalence of Toxoplasma gondii in pork on the market in Korea, an in-house enzyme-linked immunosorbent assay for tissue fluid (CAU-tf-ELISA) was developed using a soluble extract of T. gondii RH strain tachyzoites. As the standard positive controls, the piglets were experimentally infected with T. gondii: Group A (1,000 cysts-containing bradyzoites), Group B (500 cysts-containing bradyzoites) and Group C ($1.0{\times}10^3$ or $1.0{\times}10^4$ tachyzoites). The CAU-tf-ELISA demonstrated infection intensity-dependent positivity toward tissue fluids with average cut-off value 0.15: 100% for Group A, 93.8% for Group B and 40.6% for Group C. When tissue-specific cut-off values 0.066-0.199 were applied, CAU-tf-ELISA showed 96.7% sensitivity, 100% specificity, 100% positive and 90.0% negative predictive values. When compared with the same tissue fluids, performance of CAU-tf-ELISA was better than that of a commercial ELISA kit. Of the 583 Korea domestic pork samples tested, anti-T. gondii antibodies were detected from 9.1% of whole samples and 37.9% from skirt meat highest among pork parts. In the 386 imported frozen pork samples, 1.8% (skirt meat and shoulder blade) were positive for anti-T. gondii antibodies. In Korea, prevalence of anti-T. gondii antibodies in the pork on retail markets appeared high, suggesting that regulations on pig farming and facilities are necessary to supply safe pork on the tables.

• The Korean Journal of Physiology and Pharmacology
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• 제13권4호
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• pp.273-279
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• 2009

The accumulation of ${\beta}$-amyloid (A${\beta}$) aggregates is a characteristic of Alzheimer's disease (AD). Furthermore, these aggregates have neurotoxic effects on cells, and thus, molecules that inhibit A${\beta}$ aggregate formation could be valuable therapeutics for AD. It is well known that aggregation of A${\beta}$ depends on its hydrophobicity, and thus, in order to increase the hydrophilicity of A${\beta}$, we considered using citrate, an anionic surfactant with three carboxylic acid groups. We hypothesized that citrate could reduce hydrophobicity and increase hydrophilicity of A${\beta}_{1-40}$ molecules via hydrophilic/electrostatic interactions. We found that citrate significantly inhibited A${\beta}_{1-40}$ aggregation and significantly protected SH-SY5Y cell line against A${\beta}_{1-40}$ aggregates-induced neurotoxicity. In details, we examined the effects of citrate on A${\beta}_{1-40}$ aggregation and on A${\beta}_{1-40}$ aggregates-induced cytotoxicity, cell viability, and apoptosis. Th-T assays showed that citrate significantly inhibited A${\beta}_{1-40}$ aggregation in a concentration-dependent manner (Th-T intensity: from 91.3% in 0.01 mM citrate to 82.1% in 1.0 mM citrate vs. 100.0% in A${\beta}_{1-40}$ alone). In cytotoxicity and viability assays, citrate reduced the toxicity of A${\beta}_{1-40}$ in a concentration-dependent manner, in which the cytotoxicity decreased from 107.5 to 102.3% as compared with A${\beta}_{1-40}$ aggregates alone treated cells (127.3%) and the cell viability increased from 84.6 to 93.8% as compared with the A${\beta}_{1-40}$ aggregates alone treated cells (65.3%). Furthermore, Hoechst 33342 staining showed that citrate (1.0 mM) suppressed A${\beta}_{1-40}$ aggregates-induced apoptosis in the cells. This study suggests that citrate can inhibit A${\beta}_{1-40}$ aggregation and protect neurons from the apoptotic effects of A${\beta}_{1-40}$ aggregates. Accordingly, our findings suggest that citrate administration should be viewed as a novel neuroprotective strategy for AD.

• Journal of Acupuncture Research
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• 제21권5호
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• pp.45-58
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• 2004

It is well known that both of acupuncture and moxibustion are effective for treatment of human disease. For years, they have been utilizing a electro-acupuncture (EA) and moxibustion in attempt to manage gastric symptom. However, the data of combined EA and moxibustion on clinical effectiveness is conflicting and the action of combineAd acupoints is not well known. BL21 and ST36 which belong to bladder Meridian and stomach meridian are acupuncture points frequently used for healing gastrointestinal disease in oriental medicine. The present study was conducted to see the effects produced by combined electro-acupuncture(EA) and moxibustion using BL21 and ST36 on serum gastrin level in rats. In experiment, male Spraque-Dawley rats(body wt 140-160g) were selected. EA (2 Hz, intensity ; 10 times muscle twitch threshold) was applied for 30 minutes to ST36 under halothane anesthesia. Moxibustion($1.6{\pm}0.3 mg$, 5 times of a day) was applied during 3 days to BL21 under halothane anesthesia. Synergy effects of combined EA and moxibustion might be in according to stimulated method and used acupoints. The change of serum gastrin levels produced by combined EA and moxibustion is shown after vagotomy. These data suggested that many factors, such as the selection of acupoints, the stimulated EA methods, are capable of affecting combined EA and moxibustion effects and those effects may be not related with nervous system.

• 생명과학회지
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• 제20권9호
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• pp.1394-1401
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• 2010

본 연구는 12주 유산소 운동이 비만 어린이의 혈청지질성분, 항산화효소 활성 및 자율신경계 활동에 미치는 영향을 조사하였다. 피험자들은 16명의 비만어린이와 19명의 정상어린이를 대상으로 12주간 중강도 유산소 운동을 실시하였다. 측정 항목은 VO2peak, 신체조성, 혈청지질, ox-LDL, 8-OHdG, SOD, GPx 활성, total mRNA, 그리고 자율신경계 활성을 측정하였다. 그 결과 체중은 OW그룹에서 시기간 차이가 나타나지 않았으나, 12주 운동후 OR과 CO그룹에서 유의하게 증가하였다. WHR은 OR과 CO그룹에서 차이가 나타나지 않았으나, 12주 운동후 OW그룹에서 유의하게 감소하였다. 비만 그룹에서 baseline TG는 대조군 보다 더 높게 나타났으며(p<0.05), 자율신경계 활성은 낮게 나타났다. 항산화효소 유전자 발현은 모든 그룹에서 시기간 유의한 차이가 나타났다. 결론적으로 비만어린이에서 산화적 손상과 항산화효소 활성은 정상어린이와 유사하게 나타났다. 그러나 정상어린이에 비해 비만어린이의 TG는 더 높게 나타났고 자율신경계 활성은 더 낮게 나타났다. 따라서 비만어린이에서 TG의 증가와 자율신경계 활성의 감소는 비만환자의 출발점이 어린시기에 시작될 수 있음을 시사한다. 또한 규칙적인 유산소성 운동은 어린시기에서 항산화효소 발현을 수정하여 줄 수 있다고 사료된다.

• 한국어병학회지
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• 제24권2호
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• pp.161-166
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• 2011

경상북도 영덕군의 하천에 서식하는 점몰개 spotted barbel gudgeon (Squalidus multimaculatus Hosoya et Jeon)의 근육에서 새인두흡충 Clinostomum complanatum (Rudolphi, 1814)의 피낭유충이 발견되었다. 감염된 점몰개는 "yellow grub"인 기생충의 피낭유충으로 인해 표면이 울퉁불퉁하게 보였으며, 수면위에 힘없이 유영하였고 일부 폐사한 개체도 발견되었다. 분리된 탈낭유충의 형태는 혓바닥모양이었으며, 크기는 2.85~5.89 mm${\times}$0.8~1.99 mm였다. 어체당 1~98개의 피낭유충을 분리하였으며 평균 감염수는 25개로 나타났다. 특히, 성어크기인 평균 7cm 정도의 점몰개는 100% 감염되어 있었다. 본 연구는 한국의 자연수계에 서식하는 어류에서 C. complanatum 의해 질병이 발생하고 폐사가 일어난 첫 보고이다.

• Parasites, Hosts and Diseases
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• 제56권4호
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• pp.351-358
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• 2018

To grasp the infection status of Metagonimus spp. metacercariae (MsMc), the freshwater fishes were surveyed from Seomjin-gang (river) and Tamjin-gang in the Republic of Korea. Total 1,604 fishes from 7 local sites of Seomjin-gang and 1,649 fishes from 2 sites of Tamjin-gang were examined for 6 years (2012-2017) by the artificial digestion method. MsMc were detected in fishes from 7 sites, i.e., Osucheon in Imsil-gun (36.3% fish in 6 spp.), Seomjin-gang in Sunchanggun (49.8% in 18 spp.), Songdaecheon in Namwon-si (64.5% in 8 spp.), Seomjin-gang in Gokseong-gun (72.4% in 14 spp.) and in Gurye-gun (78.8% in 17 spp.), Hoengcheon (75.9% in 11 spp.) and Namsancheon (58.9% in 7 spp.) in Hadong-gun. Their average densities were 4.2, 86.8, 39.9, 43.1, 246.5, 173.6 and 67.5 per fish infected respectively. Prevalence with MsMc in rasborinid fish from Seomjin-gang was 89.2% and their intensity was 73.6 per fish infected. Endemicities of MsMc in rasborinid fish from Seomjin-gang were significantly higher in fishes from the lower reaches (prevalence: 98.7%; density: 137) rather than in fishes from the middle (93.5%; 38) and upper (72.4%; 13) reaches. MsMc were also detected in 56.1% and 66.4% fishes from 2 surveyed areas, i.e., the middle reaches in Jangheung-gun and the lower reaches in Gangjin-gun, of Tamjin-gang, and their densities were 147 and 121 per fish infected. In susceptible fishes from Tamjin-gang, the prevalence was 84.1% and density was 227 per fish infected. By the present study, it was confirmed that MsMc is highly prevalent in the fishes from Seomjin-gang and Tamjin-gang in Korea.

• 생명과학회지
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• 제30권8호
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• pp.680-687
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• 2020

본 연구에서는 Hovenia dulcis Thunberg (헛개나무)의 80% 메탄올 분획물의 항산화 및 세포 노화 억제활성을 규명하고자 하였다. 헛개나무 에틸아세테이트 분획물이 DPPH라이칼 소거능에서 가장 높은 활성 저해를 보였고 (RC₅₀ = 3.6±0.8 ㎍/ml), 총 페놀(417.2±5.3 mg GAE/ml) 및 총플라보노이드(260.6±27.5 mg QE/ml) 측정에서도 가장 높은 활성을 보였다. HDF 세포에서 노화가 진행됨에 따라 sm22의 발현이 증가되었고(p<0.001), β-갈락토시다아제의 염색양이 증가(p<0.001)되는 것을 확인하였다. 반면, sm22의 증가는 세포 노화가 진행된 세포일수록 증가폭이 감소되는 것이 확인되었고, 초기노화에서 발현이 높은 것을 알 수 있었다. 헛개나무 에틸아세테이트 분획물을 처리시 HDF세포의 EGF (p<0.01), PDGF-BB (p<0.01), SHH (p<0.05)의 사이토카인이 유의적으로 증가를 보이며, 노화 시 발생된 sm22의 수치를 감소시키는 것을 보였다. 이러한 결과는 헛개나무 에틸아세테이트 분획물이 초기 세포 노화의 작용을 조절할 수 있음을 보여준다.

• Asian Pacific Journal of Cancer Prevention
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• 제16권15호
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• pp.6267-6272
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• 2015

Background: Extra nodal lymphoma (ENL) constitutes about 33 % of all non-Hodgkin's lymphoma. 18-28% develops in the head and neck region. A multimodality treatment with multi-agent chemotherapy (CT) and radiotherapy (RT) is considered optimum. Materials and Methods: We retrieved the treatment charts of patients of HNENL treated in our institute from 2001-2012. The charts were reviewed and the demographic, treatment details and outcome of HNENL patients were retrieved using predesigned pro-forma. Results: We retrieved data of 75consecutive patients HNENL. Median age was 47years (Range: 8-76 years). Of the 75 patients 51 were male and 24 were female. 55patients were evaluable. The patient and tumor characteristics are summarized in Table 1. All patients were staged comprehensively with contrast enhanced computed tomography of head, neck, thorax, abdomen, pelvis and bone marrow aspiration and biopsy 66 patients received a combination multi-agent CT with CHOP being the commonest regimen. 42 patients received 4 or lesser number of cycles of chemotherapy whereas 24received more than 4 cycles chemotherapy. Post radiotherapy, 41 out of 42 patients had a complete response at 3 months. Only 21patients had a complete response after chemotherapy. All patients received radiation (mostly involved field radiation) as a part of the treatment. The median radiation dose was 45 Gray (Range: 36 Gray-50 Gray). The radiation was planned by 2D fluoro simulation based technique in 37cases and by 3 Dimensional conformal radiation therapy (3DCRT) in 36 cases. Two patients were planned by the intensity modulated radiation therapy (IMRT) technique. IMRT was planned for one thyroid and one nasal cavity primary. 5 patients experienced relapse after a median follow up of 19 months. The median survival was not reached. The estimated two and three year survival were 92.9% (95%CI- 68.6- 95.35) and 88% (95%CI- 60.82 - 92.66) respectively. Univariate analysis revealed higher stage and poorer baseline performance status to be significantly associated with worse progression free survival. 5 patients progressed (relapse or primary disease progression) after treatment. Of the 5 patients, two patients were primary orbital NHL, two patients had NHL nasal cavity and one was NHL thyroid. Conclusions: Combined modality treatment in HNENL confers excellent disease control with acceptable side effects.

• Investigative Magnetic Resonance Imaging
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• 제18권4호
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• pp.290-302
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• 2014

목적: 자화율 강조 자기공명영상 (Susceptibility-weighted imaging)은 혈액분해산물, 석회화, 철 침착물을 발견하는데 있어 높은 민감도를 보이는 3D spoiled gradient-echo pulse sequence 이다. 본 임상화보는 자화율 강조 자기공명영상의 주된 임상적 적용에 대해 설명하고 논의하는 데에 그 목적이 있다. 대상과 방법: 자화율 강조 자기공명영상은 자기강도영상 (magnitude image)과 위상영상 (phase image)을 이용한 고해상도, 3D fully velocity-compensated gradient-echo sequence 에 기초를 두고 있다. 정맥 구조물의 가시성을 향상시키기 위해, 자기강도영상은 여과된 위상 데이터 (phase data) 로부터 발생된 위상 마스크 (phase mask)를 이용해 증폭되고, 이것은 최소강도투사 (Minimal intensive projection) 알고리즘을 이용한 3D dataset 후처리 과정을 거치게 된다. 3T 자기공명기기에서 SWI를 포함하는 자기공명영상 검사를 시행한 총 200명의 환자를 대상으로 연구하였다. 결과: 자화율 강조 자기공명영상은 다양한 뇌 질환의 발견에 매우 유용하였다. 200명의 환자 중 80명은 선천성 정맥 기형, 22명은 해면상 혈관종, 12명은 다양한 질환에서의 석회화, 21명은 혈관자화 징후 (susceptibility vessel sign) 또는 미세출혈을 동반하는 뇌혈관 질환, 52명은 뇌종양, 2명은 미만성 축삭 손상, 3명은 동정맥 기형, 5명은 뇌경막 동정맥루, 1명은 모야모야병, 그리고 2명은 파킨슨병이 관찰되었다. 결론: 자화율 강조 자기공명영상은 미세 저혈량 혈관성 병변, 석회화 그리고 미세출혈과 다양한 뇌병변의 진단에 유용하다.

• Radiation Oncology Journal
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• 제37권3호
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• pp.224-231
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• 2019

Purpose: To investigate the patterns of recurrence in patients with neuroblastoma treated with radiation therapy to the primary tumor site. Materials and Methods: We retrospectively analyzed patients with high-risk neuroblastoma managed with definitive treatment with radiation therapy to the primary tumor site between January 2003 and June 2017. These patients underwent three-dimensional conformal radiation therapy or intensity-modulated radiation therapy. A total of 14-36 Gy was delivered to the planning target volume, which included the primary tumor bed and the selected metastatic site. The disease stage was determined according to the International Neuroblastoma Staging System (INSS). We evaluated the recurrence pattern (i.e., local or systemic), progression-free survival, and overall survival. Results: A total of 40 patients with high-risk neuroblastoma were included in this study. The median patient age was 4 years (range, 1 to 11 years). Thirty patients (75%) had INSS stage 4 neuroblastoma. At the median follow-up of 58 months, there were 6 cases of local recurrence and 10 cases of systemic recurrence. Among the 6 local failure cases, 4 relapsed adjacent to the radiation field. The other 2 relapsed in the radiation field (i.e., para-aortic and retroperitoneal areas). The main sites of distant metastasis were the bone, lymph nodes, and bone marrow. The 5-year progression-free survival was 70.9% and the 5-year overall survival was 74.3%. Conclusion: Radiation therapy directed at the primary tumor site provides good local control. It seems to be adequate for disease control in patients with high-risk neuroblastoma after chemotherapy and surgical resection.