• 분석과학
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• 제22권5호
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• pp.407-414
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• 2009

가스크로마토그래피-질량분석기 (GC/MS)를 이용하여 뇨 중의 cholesterol, lanosterol, desmosterol 의 동시분석법을 개발하였다. 뇨 시료는 ${\beta}$-glucuronidase/arylsulfatase를 첨가하여 효소가수분해한 후 에틸아세테이트-헥산 (2:3, v/v)으로 추출하였으며 추출한 잔사를 MSTFA/TMSI/TMCS (100:2:5 v/v/v)로 유도체화한 후 GC/MS의 selective ion monitoring mode에서 분석하였다. 개발된 분석방법은 검량선에서 좋은 직선성 ($r^2=0.998{\sim}0.999$)과 회수율 (80.0%~113%)을 보였으며 5-200 ng/mL의 농도범위에서 15% 이내의 정확도와 정밀도를 보였다. 개발된 분석법은 고지혈증 유도 쥐에 pravastatin을 7일동안 70과 250 mg/kg/day로 경구투여한 후 채취한 뇨 시료를 분석하는데 적용하였다. 측정 결과 뇨 중 스테롤의 농도가 약물 투여한 쥐에서 대조군에서 보다 유의성 있게 낮아 약물효과를 관찰할 수 있었다. 이 결과로부터 개발된 방법을 뇨 중 스테롤의 농도를 정량함으로서 스타틴약물의 효과를 측정하는데 적용할 수 있음을 확인하였다.

• 해양환경안전학회지
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• 제29권4호
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• pp.332-337
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• 2023

우리나라는 3면이 바다로 둘러싸여 있을 뿐만 아니라 국가하천과 지방하천의 연장이 26,843km에 달하고 있어 풍부한 해수면과 내수면이 함께 공존하는 지리적 특징이 있다. 국민소득의 향상 등으로 내수면에서 운항하는 선박이 지속적으로 증가하고 있어 내수면에서 선박사고 및 인명사고의 위험성도 증가하고 있다. 본 연구에서는 내수면관련 법령조사 및 운영현황 분석을 통하여 거시적인 내수면 선박의 안전관리 대책 방안을 제시하였다. 그 개선방안으로 하드웨어적 인프라로서 사고 초기대응 및 인명구조의 골든타임 확보를 위한 충분한 내수면 소방정의 확보와 내수면 선박 사고예방 전문기관의 운영을 제언하며, 소프트웨어적 인프라로서 내수면 선박의 출항통제기준 마련과 현행 해수면 선박에만 적용하고 있는 안전진단제도를 기반으로 내수면 선박의 특성에 맞는 맞춤형 제도도입을 제언하였다. 이러한 내수면 안전관리 정책은 내수면 선박 사고발생 시 신속하고 체계적인 대처 방안 마련에 기여할 것으로 기대되며, 세월호 사건 이후 잠시 활성화 되었던 내수면 선박에 대한 안전관련 연구에 지속적인 관심을 갖는 기회가 되었으면 한다.

• 대한본초학회지
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• 제39권3호
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• pp.107-114
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• 2024

Objective : Cicadae Periostracum (CP), which is the discarded shell of the Cryptotympana atrata (Fabricius, 1775), is a recognized component of oriental medicine for treatment sore throat, itching, shock, sedation, edema. However, the safety and toxicity of CP have not yet been established. It has been reported that symptoms of addiction or side effects may occur in patients who take high doses of CP or who are hypersensitive to it. Therefore, we investigated the acute toxicity of an CP extracts in Sprague-Dawley (SD) rats. Methods : To study acute toxicity, five SD rats of each sex per group were treated with CP extracts at single doses of 0, 500, 1000, or 2000 mg/kg administrated by oral gavage, and body weight, clinical signs, and mortality were observed after dosing. At the end of 14-day observation period, all animals were sacrificed and complete hematological and macroscopic examinations were performed. Results : There were no dead animal and test article-related effects on body weight change or the gross finding. No toxicologically significant results were observed between control and treated groups in hematology. Although salivation related to stress at the highest dose was observed in clinical signs immediately after administration, it is considered to have no toxicological significance. Conclusion : As the results, we did not find any adverse effect at the dose levels of 500, 1000, or 2000 mg/kg in rats. The minimal lethal dose was considered to be over 2000 mg/kg body weight in rats.

• 대한두경부종양학회지
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• 제39권2호
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• pp.49-54
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• 2023

Neck masses can have various origins and diverse presentations, making accurate diagnosis challenging. Schwannomas and lymphoepithelial cysts are commonly encountered neck tumors, and it is hard to get differential diagnosis. A 50-year-old woman presented with a progressively enlarging right neck mass discovered five years ago. Upon examination, a 3 cm firm, non-tender, and mobile tumor was found in the right neck level II region. Imaging studies suggested a tumor originating from the cervical sympathetic chain. The patient underwent a resection of the tumor under general anesthesia. Postoperative follow-up showed no complications or signs of recurrence. However, contrary to the initial suspicion of a schwannoma, the final pathological examination revealed a lymphoepithelial cyst. In this paper, we present a case of a cervical lymphoepithelial cyst misdiagnosed as a schwannoma, aiming to compare the clinical and histological characteristics of these two tumors and provide insights into appropriate diagnosis and management.

• IMMUNE NETWORK
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• 제23권4호
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• pp.33.1-33.13
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• 2023

Vaccination against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has been acknowledged as an effective mean of preventing infection and hospitalization. However, the emergence of highly transmissible SARS-CoV-2 variants of concern (VOCs) has led to substantial increase in infections among children and adolescents. Vaccine-induced immunity and longevity have not been well defined in this population. Therefore, we aimed to analyze humoral and cellular immune responses against ancestral and SARS-CoV-2 variants after two shots of the BNT162b2 vaccine in healthy adolescents. Although vaccination induced a robust increase of spike-specific binding Abs and neutralizing Abs against the ancestral and SARS-CoV-2 variants, the neutralizing activity against the Omicron variant was significantly low. On the contrary, vaccine-induced memory CD4⁺ T cells exhibited substantial responses against both ancestral and Omicron spike proteins. Notably, CD4⁺ T cell responses against both ancestral and Omicron strains were preserved at 3 months after two shots of the BNT162b2 vaccine without waning. Polyfunctionality of vaccine-induced memory T cells was also preserved in response to Omicron spike protein. The present findings characterize the protective immunity of vaccination for adolescents in the era of continuous emergence of variants/subvariants.

• 동의신경정신과학회지
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• 제35권2호
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• pp.141-151
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• 2024

Objectives: To compare symptoms and characteristics among patients diagnosed with Hwabyung according to their yin-yang personality types. Methods: A structured clinical interview was conducted to diagnose Hwabyung, followed by a cross-sectional study involving a total of 118 Hwabyung patients (95 females). Various measures including the Sasang Personality Questionnaire (SPQ), Hwabyung Comprehensive Test (HCT), HwaByung Scale (HBS), State-Trait Anger Expression Inventory (STAXI), Beck Depression Inventory-II (BDI-II), Beck Anxiety Inventory (BAI), Eogul Scale (ES), and Patient Health Questionnaire-15 (PHQ-15) were administered. Results: SPQ-total showed significant negative correlations with HBS-personality and STAXI-control, and a significant positive correlation with STAXI-out. SPQ-behavior showed significant positive correlations with HBS-symptom, STAXI-trait, STAXI-in, STAXI-out, BDI-II, BAI, ES, and PHQ-15. SPQ-cognition exhibited significant negative correlations with HBS-personality, STAXI-control, and ES. SPQ-emotion had significant negative correlations with HBS-personality and STAXI-in and a significant positive correlation with STAXI-out. SPQ-Yin demonstrated a significantly higher HBS-personality than SPQ-Yang. SPQ-Yang exhibited significantly higher STAXI-out than SPQ-Yin, whereas SPQ-Yin showed significantly higher STAXI-control and STAXI-in than SPQ-Yang. Although differences in depression, anxiety, resentment, and physical symptoms between yin and yang were not statistically significant, variations in interpretation criteria were observed. Conclusions: Anger expression patterns and physical/psychological symptoms among Hwabyung patients are different based on their yin-yang personality types. These findings can inform the prediction of symptoms in Hwabyung patients according to their yin-yang personality types and aid in establishing appropriate treatment plans.

• 한국식품저장유통학회지
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• 제31권1호
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• pp.161-172
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• 2024

본 연구에서는 모싯잎 에탄올 추출물이 첨가된 산업용 배지에 유산균(L. plantarum JBLAB0101와 L. rhamnosus GG(LGG)) 발효특성을 확인하였고, 발효물에 대한 항비만 효능 분석을 수행하였다. 유산균 발효기간 중 이화학적특성(pH, 총산도), 생균수, 유기산 및 유리당 함량을 분석하였다. 생균수는 발효 4일 차에 최대치로 8.75-8.85 log CFU/mL로 확인되었으며, 이에 따라 pH는 6.58-6.66에서 3.74-3.79로 감소하였고, 총산도는 0.39-0.40%에서 2.07-2.19%로 증가하였다. Lactic acid는 발효 4일 차에 1,676.03-1,910.12 mg%로 증가하였으며, glucose는 L. plantarum 균주에서 모두 소모되었고, LGG 균주는 348.35 mg% 잔존하였다. 항비만 효능 평가는 pancreatic lipase 저해활성과 3T3-L1 세포주를 이용한 지질분화억제능(지질축적률, 렙틴 생성량 및 PPAR-γ 및 SREBP-1c 유전자의 mRNA 발현량)을 분석하였다. 모싯잎 추출물 첨가 산업용 배지에 접종된 균주의 이름과 배양유무에 따라 비발효물(UFRL), JBLAB0101 발효물(FRLPLA) 및 LGG 발효물(FRLLGG)로 구분하였다. Lipase 저해활성은 UFRL, FRLPLA 및 FRLLGG을 동일농도 0.5 mg/mL에 처리 시 각각 12.19%, 30.10% 및 25.63%로 확인되었다. 3T3-L1 세포주에 FRLPLA를 200 ㎍/mL 처리함에 따라 비처리구에 비해 지질축적률, 렙틴 생성량, PPAR-γ 및 SREBP-1c 유전자의 mRNA 발현량이 각각 37.54%, 54.64%, 24.18% 및 31.32% 감소하였다. 이와 같은 결과로 항비만 효능이 있는 모싯잎 추출물이 첨가된 산업용 배지에 L. plantarum JBLAB0101 균주와 LGG 균주의 유산발효가 항비만 효능 증진 가능성이 기대된다.

• Korean Journal of Radiology
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• 제24권7호
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• pp.681-689
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• 2023

Objective: Three-dimensional rotational angiography (3D-RA) is increasingly used for the evaluation of intracranial aneurysms (IAs); however, radiation exposure to the lens is a concern. We investigated the effect of head off-centering by adjusting table height on the lens dose during 3D-RA and its feasibility in patient examination. Materials and Methods: The effect of head off-centering during 3D-RA on the lens radiation dose at various table heights was investigated using a RANDO head phantom (Alderson Research Labs). We prospectively enrolled 20 patients (58.0 ± 9.4 years) with IAs who were scheduled to undergo bilateral 3D-RA. In all patients' 3D-RA, the lens dose-reduction protocol involving elevation of the examination table was applied to one internal carotid artery, and the conventional protocol was applied to the other. The lens dose was measured using photoluminescent glass dosimeters (GD-352M, AGC Techno Glass Co., LTD), and radiation dose metrics were compared between the two protocols. Image quality was quantitatively analyzed using source images for image noise, signal-to-noise ratio, and contrast-to-noise ratio. Additionally, three reviewers qualitatively assessed the image quality using a five-point Likert scale. Results: The phantom study showed that the lens dose was reduced by an average of 38% per 1 cm increase in table height. In the patient study, the dose-reduction protocol (elevating the table height by an average of 2.3 cm) led to an 83% reduction in the median dose from 4.65 mGy to 0.79 mGy (P < 0.001). There were no significant differences between dose-reduction and conventional protocols in the kerma area product (7.34 vs. 7.40 Gy·cm², P = 0.892), air kerma (75.7 vs. 75.1 mGy, P = 0.872), and image quality. Conclusion: The lens radiation dose was significantly affected by table height adjustment during 3D-RA. Intentional head off-centering by elevation of the table is a simple and effective way to reduce the lens dose in clinical practice.

• 대한한의학방제학회지
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• 제31권4호
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• pp.231-243
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• 2023

Objectives : Jasminum officinale L. var. grandiflorum is used as a traditional or folk remedy in China to treat arthritis, hepatitis, duodenitis, conjunctivitis, gastritis, and diarrhea. In this study, we aimed to study the hepatocyte protective activity and molecular mechanism of Jasminum officinale L. var. grandiflorum aqueous extract (JGW) using HepG2 hepatocyte cell lines. Methods : HepG2 cells were pretreated with diverse concentrations of JGW, and then the cells were exposed to tert-butyl hydroperoxide (tBHP) for inducing oxidative stress. Hydrogen peroxide (H₂O₂) production, glutathione (GSH) concentration, mitochondrial membrane potential (MMP) and cell viability were measured to investigate hepato-protective effects of JGW. Phosphorylation of AMP-activated protein kinases (AMPK), acetyl coenzyme A carboxylase (ACC) and effects of compound C on cell viability were examined to observe the role of AMPK on JGW-mediated cytoprotection. Results : Pretreatment with JGW (10-300 ㎍/mL) significantly suppressed cytotoxicity induced by tBHP in a concentration dependent manner and reduced the expression of cleaved PARP and cleaved caspase-3 proteins related to apoptosis in HepG2 cells. In addition, pretreatment with JGW significantly prevented the increase in H₂O₂ production, GSH depletion, and lower MMP induced by tBHP. Treatment with JGW (30 minutes of incubation and concentrations of 100 and 300 ㎍/mL) increased the phosphorylation of AMPK and ACC and treatment with compound C, a chemical inhibitor of AMPK, inhibited the cytoprotective effect of JGW. Conclusions : Our results demonstrated that JGW may protect hepatocytes from oxidative stress via activation of AMPK.

• Journal of Cardiovascular Imaging
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• 제31권1호
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• pp.51-61
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• 2023

BACKGROUND: Valvular heart disease (VHD) is a common cause of cardiovascular morbidity and mortality worldwide; however, its epidemiological profile in Korea requires elucidation. METHODS: In this nationwide retrospective cohort study from the Korean valve survey, which collected clinical and echocardiographic data on VHD from 45 medical centers, we identified 4,089 patients with VHD between September and October 2019. RESULTS: The aortic valve was the most commonly affected valve (n = 1,956 [47.8%]), followed by the mitral valve (n = 1,598 [39.1%]) and tricuspid valve (n = 1,172 [28.6%]). There were 1,188 cases of aortic stenosis (AS) and 926 cases of aortic regurgitation. The most common etiology of AS was degenerative disease (78.9%). The proportion of AS increased with age and accounted for the largest proportion of VHD in patients aged 80-89 years. There were 1,384 cases of mitral regurgitation (MR) and 244 cases of mitral stenosis (MS). The most common etiologies for primary and secondary MR were degenerative disease (44.3%) and non-ischemic heart disease (63.0%), respectively, whereas rheumatic disease (74.6%) was the predominant cause of MS. There were 1,172 tricuspid regurgitation (TR) cases, of which 46.9% were isolated and 53.1% were associated with other valvular diseases, most commonly with MR. The most common type of TR was secondary (90.2%), while primary accounted for 6.1%. CONCLUSIONS: This report demonstrates the current epidemiological status of VHD in Korea. The results of this study can be used as fundamental data for developing Korean guidelines for VHD.