• 한국작물학회:학술대회논문집
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• 한국작물학회 2022년도 춘계학술대회
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• pp.105-105
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• 2022

• 한국응용약물학회:학술대회논문집
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• 한국응용약물학회 1996년도 춘계학술대회
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• pp.213-213
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• 1996

The effects of the anti-tumor agent, SDZ-y2434, on rat kidney were investigated to predict the toxicities of its derivatives and to develope less toxic derivatives. After adjusted in metabolic cages for 5 days, rats were treated SDZ-62434(acute : 25mg/kg, i.p, once and 50mg/kg, i.p., once; subacute ; 10mg/kg, i.p., daily for 7 days). Kidney weights and urine volume during the treatment were observed. Creatinine concentration, protein concentration and the activities of N-acetyl-${\beta}$-D-glucosaminidase (NAG), alanine aminopeptidase (AAP), ${\gamma}$-glutamyl transpeptidase (GGT) and lactate dehydrogenase(LDH) in 24 hr urine were also determined. The kidney weights after the acute and subacute administration didn't show any difference. Urine volume increased 5 days after the acute administration (50mg/kg) and 3 days after the subacute administration. The excretion of creatinine was increased 5 days after the acute (50mg/kg) and subacute administration. However, the protein excretion didn't show any change. NAG acivity declined 7 days after the subacute administration. AAP and GGT activites increased 3 days after the acute administration (50mg/kg) but, returned to the control value. LDH activity showed continuousely high value after the subacute administration. These results indicates that the acute administration of SDZ-62434 might damage on glomerulus and that the subacute administration might be cytotoxic to kidney cells.

• 수산경영론집
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• 제40권3호
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• pp.169-187
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• 2009

This study analyzes the long and short term effect of exchange rate on the import of Korea's fisheries focussed on main fisheries imported from China. The estimation models consist of the following contents. The first model consists of one dependent variable-import quantity of fisheries imported from China(${IMQ_t}^{CHO}$) and three independent variables-${RP_t}^{CHO}$, $EXC_t$ and $GDP_t$. The second one-one dependent variable-import quantity of fisheries imported from China(${JMQ_t}^{NAG})$ and three independent variables-${RP_t}^{NAG}$, $EX_t$ and $GDP_t$. the third one-one dependent variable-import quantity of fisheries imported from China(${IMQ_t}^{AH}$) and three independent variables-${RP_t}^{AH}$, $EX_t$ and $GDP_t$. the forth one-one dependent variable-import quantity of fisheries imported from China(${IMQ_t}^{KO}$) and three independent variables-${RP_t}^{KO)$, $EX_t$ and $GDP_t$. the last one is made up of one dependent variable-import quantity of fisheries imported from China(${IMQ_t}^{GAL}$) and three independent variables-, ${RP_t}^{GAL}$, $EX_t$ and $GDP_t$. and. The estimation results show that exchange rate of the independent variables are statistically significant in only the first model. The figure is elastic. Especially, the effect of exchange rate in first model is grater than that of the. However, the effect of exchange rate, one of independent variables in the ECM, is not statistically significant.

• Asian Pacific Journal of Cancer Prevention
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• 제14권11호
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• pp.6281-6286
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• 2013

Background: To further investigate the molecular basis of lung cancer development, we utilize a microarray to identify differentially expressed genes associated with various TNM stages of adenocarcinoma, a subtype with increasing incidence in recent years in China. Methods: A 35K oligo gene array, covering about 25,100 genes, was used to screen differentially expressed genes among 90 tumor samples of lung adenocarcinoma in various TNM stages. To verify the gene array data, three genes (Zimp7, GINS2 and NAG-1) were confirmed by real-time RT-PCR in a different set of samples from the gene array. Results: First, we obtained 640 differentially expressed genes in lung adenocarcinomas compared to the surrounding normal lung tissues. Then, from the 640 candidates we identified 10 differentially expressed genes among different TNM stages (Stage I, II and IIIA), of which Zimp7, GINS2 and NAG-1 genes were first reported to be present at a high level in lung adenocarcinoma. The results of qRT-PCR for the three genes were consistent with those from the gene array. Conclusions: We identified 10 candidate genes associated with different TNM stages in lung adenocarcinoma in the Chinese population, which should provide new insights into the molecular basis underlying the development of lung adenocarcinoma and may offer new targets for the diagnosis, therapy and prognosis prediction.

• 전기전자학회논문지
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• 제24권3호
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• pp.766-776
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• 2020

최근 기계학습에 대한 관심이 높아지고 연구가 활성화됨에 따라 다양한 기계학습 모델에서 최적의 하이퍼 파라미터 조합을 찾는 것이 중요해지고 있다. 본 논문에서는 다양한 하이퍼 파라미터 중에서 옵티마이저에 중점을 두고, 다양한 데이터에서 주요 옵티마이저들의 성능을 측정하고 비교하였다. 특히, 가장 기본이 되는 SGD부터 Momentum, NAG, AdaGrad, RMSProp, AdaDelta, Adam, AdaMax, Nadam까지 총 9개의 옵티마이저의 성능을 MNIST, CIFAR-10, IRIS, TITANIC, Boston Housing Price 데이터를 이용하여 비교하였다. 실험 결과, 전체적으로 Adam과 Nadam을 사용하였을 때 기계학습 모델의 손실 함숫값이 가장 빠르게 감소하는 것을 확인할 수 있었으며, F1 score 또한 높아짐을 확인할 수 있었다. 한편, AdaMax는 학습 중에 불안정한 모습을 많이 보여주었으며, AdaDelta는 다른 옵티마이저들에 비하여 수렴 속도가 느리며 성능이 낮은 것을 확인할 수 있었다.

• IMMUNE NETWORK
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• 제11권4호
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• pp.210-215
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• 2011

It is already known that high concentration of vitamin C induces apoptosis on tumor cells. However, there is no report regarding the function of vitamin C on the modulation of immune susceptibility of cancer. Therefore, we investigated whether vitamin C can modulate immune susceptibility of tumor cells, especially on the induction of Fas-mediated apoptosis. First, the optimal concentration of vitamin C, which cannot induce damages on tumor cells for 36 hrs. We found that 2 mM of vitamin C did not show harmful effect. In addition, the optimal concentration of agonistic anti-Fas Abs for 18 hrs was examined. As a result, 400 ng/ml of agonistic anti-Fas Abs did not induce apoptosis on tumor cells. Next, we tried to find the effect of 2 mM of vitamin C on the modulation of the susceptibility to agonistic anti-Fas Abs. When tumor cells were cultured with 400 ng/ml of agonistic anti-Fas Abs for 18 hrs, after pre-treatment with 2 mM of vitamin C for 24 hrs, viability of cells was decreased. Interestingly, we found that the expression of Fas (CD95) and MHC class I was increased by the treatment of vitamin C. Taken together, vitamin C increases the susceptibility of tumor cells to anti-Fas Abs and the expression of Fas (CD95) and MHC class I on tumor cells.

• Biomolecules & Therapeutics
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• 제6권2호
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• pp.130-138
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• 1998

In this study, the effect of verapamil (VER) on cyclosporin A (CsA)-induced nephrotoxicity was investigated in uninephrectomized rats. Male Wistar rats were administered CsA (50 mg/kg/day, p.o.) or VER (0.5 mg/kg/day, i.p.) with CsA (50 mg/kg/day, p.o.) for 20 days. The urinary N-acetyl-$\beta$-D-glucosaminidase (NAG) activity along with BUN, serum creatinine, creatinine clearance (CLcr), body weight, and 24 hr-urine output were measured and histopathologic changes of kidney were evaluated by light and electron microscopy. The results obtained from this study can be summarized as follows: While NAG activity, BUN and serum creatinine was progressively increased and CLcr significantly decreased in CsA group, VER almost signifi-cantly (p<0.05) suppressed and normalized CsA-induced changes in VER+CSA group. While urine output increased until 12th days and thereafter progressively decreased in CsA group, it gradually increased in control and VER+CSA group. While body weight progressively made a gain in control and VER+CSA groups, it significantly (p<0.05) lost in CsA group. On light microscopy, the glomerular hyperemia and proximal convoluted tubular (PCT) dilatation, focal tubular cell vacuolation and necrosis were clearly evident in CsA group, but, were not seen in other groups. Ultrastructural studies revealed thickened glomerular endothelium and basal lamina of capillary, irregular shaped pedicels of podocytes, indistinct slit pores and narrowed bowman's space. The large oval vacuoles with dense debris and phagosome were distributed in apical zone and deformed microvilli and mitochondria were seen in the PCT cell of CsA group. But, glomeruli and PCT cell were relatively preserved in normal apperance in other groups. In conclusion, it is suggested that verapamil has a protective effect on cyclosporine-induced nephrotoxicity in uninephrectomized rats.

• The Korean Journal of Physiology and Pharmacology
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• 제25권4호
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• pp.321-331
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• 2021

Vancomycin, an antibiotic used occasionally as a last line of treatment for methicillin-resistant Staphylococcus aureus, is reportedly associated with nephrotoxicity. This study aimed at evaluating the protective effects of lutein against vancomycin-induced acute renal injury. Peroxisome proliferator-activated receptor gamma (PPARγ) and its associated role in renoprotection by lutein was also examined. Male BALB/c mice were divided into six treatment groups: control with normal saline, lutein (200 mg/kg), vancomycin (250 mg/kg), vancomycin (500 mg/kg), vancomycin (250 mg/kg) with lutein, and vancomycin (500 mg/kg) with lutein groups; they were euthanized after 7 days of treatment. Thereafter, samples of blood, urine, and kidney tissue of the mice were analyzed, followed by the determination of levels of N-acetyl-β-D-glucosaminidase (NAG) in the urine, renal creatine kinase; protein carbonyl, malondialdehyde, and caspase-3 in the kidney; and the expression of PPARγ, nuclear factor erythroid 2-related factor 2 (Nrf2), and nuclear factor-kappaB (NF-κB) in renal tissue. Results showed that the levels of protein carbonyl and malondialdehyde, and the activity of NAG, creatine kinase and caspase-3, were significantly increased in the vancomycin-treatment groups. Moreover, the levels of Nrf2 significantly decreased, while NF-κB expression increased. Lutein ameliorated these effects, and significantly increased PPARγ expression. Furthermore, it attenuated vancomycin-induced histological alterations such as, tissue necrosis and hypertrophy. Therefore, we conclude that lutein protects against vancomycin-induced renal injury by potentially upregulating PPARγ/Nrf2 expression in the renal tissues, and consequently downregulating the pathways: inflammation by NF-κB and apoptosis by caspase-3.

• 생명과학회지
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• 제24권9호
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• pp.967-972
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• 2014

본 연구는 한국 고유의 전통주인 막걸리 제조시 생성되는 주박 추출물과 유기용매 분획물을 총 85종 분리하여, 이들의 대장암 세포주에 대한 항성장 활성과 활성기전을 연구하였다. 이들 중 세포생존율 연구결과에 따라 3가지 종류의 분획물(KSD-E1-3, KSD-E2-3, KSD-E4-3)을 선별하였다. 이 중 가장 활성이 높은 KSD-E1-3 분획물에 의한 유전체 수준에서의 유전자 발현변화를 확인하기 위하여 oligo DNA microarray 실험을 수행하였다. 그 결과, 2배이상 발현이 증가된 유전자들 가운데 항암 유전자인 NAG-1, ATF3, DDIT3 그리고 p21을 선별하여 추가 실험을 진행하였다. 세포생존율 결과에 따라 선별된 3가지 종류의 분획물(KSD-E1-3, KSD-E2-3 그리고 KSD-E4-3)에 의한 4가지 종류의 유전자의 발현을 확인한 결과, KSD-E1-3에 의하여 모든 유전자의 발현이 높게 증가되었다. KSD-E1-3에 의한 유전자의 발현이 전사조절인자 p53에 의존적인지 확인하고자 p53 null HCT116 세포주를 이용하여 RT-PCR한 결과, NAG-1, ATF3, 그리고 DDIT3 유전자 p53에 비의존적이었으며, 반면 p21 유전자는 p53에 의해서만 발현이 증가되는 것을 확인하였다. 이러한 연구 결과는 주박 추출물이 다양한 기작에 의해 항암 유전자의 발현을 유도함으로써 암 세포에 대한 항성장 활성을 보여주고 있음을 나타낸다.

• 생명과학회지
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• 제33권1호
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• pp.56-63
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• 2023

2021년 국내에서 가장 많은 수의 식중독 환자가 Salmonella로 인해 발생하였고, 전 세계적으로도 꾸준한 발생이 보고되고 있다. 본 연구에서는 2021년 9월 중 경상남도에서 발생한 2건의 Salmonella 원인의 식중독에 대한 사례 보고 및 분리된 Salmonella 균주의 분자역학적 특성을 분석하였다. 학교 급식 사례는 동일 섭취원 588명 중 29명(4.9%)이 설사 및 복통 증상을 보였고 36명(환자 29, 조리 종사자 7)에 대한 검사 결과, Salmonella Enteritidis가 환자 17명(47.2%)에서 검출되어 주원인으로 판단되었다. 식품 및 환경 검체 35건에서는 S. Enteritidis가 검출되지 않았다. 다음으로, 회사 내 발생 사례는 동일 섭취원 2,900명 중 87명 (3.0%)이 설사, 복통, 발열 증상을 보여 50명(환자 40, 조리 종사자 10)을 검사를 했고, 그 결과 환자 28명 (56.0%)에서 S. Enteritidis가 검출되었다. 그중 4명은 Vibrio cholerae (NAG)와 S. Enteritidis가 중복 검출되었고 1명은 V. cholerae (NAG)만 검출되었다. 이는 S. Enteritidis와 복합적으로 작용했을 가능성을 배제할 수는 없지만 주원인으로는 S. Enteritidis로 판단되었다. 식품 및 환경 검체 125건 중 보존식에서는 S. Enteritidis가 불검출이었으나, 회사에서 단체로 배달 주문하여 섭취한 토스트에서 S. Enteritidis가 검출되었다. PFGE 유전학적 상동성을 분석한 결과, 환자와 식품에서 분리된 S. Enteritidis 균주가 동일한 유형으로 확인되었다. 이는 앞서 발생한 경남지역 학교 사례와 타 지역 사례의 환자 분리 균주와도 동일한 유형으로 확인되어 문제성이 더욱 제고되고 있다. 이와 같이 S. Enteritidis 원인 식중독의 분자역학적 특성 분석을 통해 역학적 관리 및 식중독 예방에 필요한 자료를 제공하고자 한다.