• 대한한방내과학회지
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• 제25권2호
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• pp.277-287
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• 2004

Objective : Diabetes is a disease in which the body does not produce or properly use insulin. Etiological studies of diabetes and its complications showed that oxidative stress might playa major role. Therefore, many efforts have been made to regulate oxygen free radicals for treating diabetes and its complications. Because Jindangwon has been known to be effective in treatment of diabetes, the methanol extract of Jindangwon was tested for its effectiveness in reducing the oxidative stress induced by Streptozotocin. Methods : Jindangwon was washed, dried in the shade and crushed. The crushed Jindangwon was extracted 3 times, each time with 3 volumes of methyl alcohol at $60^{\circ}C$ for 24 hours. The extract was filtered and evaporated under reduced pressure using a rotary evaporator to yield 30.6 g. Jindangwon extract was oral-administered to the diabetic rats induced by streptozotocin 50 mg per 1 kg of body weight for 15 days. The efficacy of the Jindangwon extract was examined with regard to the enzymatic pathways involved in the oxygen free radical production and the glutathione balance. Results : he effects of the methanol extract of Jindangwon in streptozotocin-induced diabetics rats with regard to body weight, blood glucose level, hepatic lipid peroxide level, hepatic xanthine oxidase activity and type conversion rate, hepatic glutathione level, hepatic glutathione peroxidase activity, hepatic glutathione reductase activity, hepatic aldose reductase activity, and hepatic sorbitol dehydrogenase activity were favorable enough to suggest that it is a cure for diabetes and its complications. Conclusions :These results support Jindangwon as an effective reducing agent for oxidative stress in the tissues and organs by regulating the production of oxygen free radicals. Jindangwon, in particular, shows promising results for its use as a cure, or preventative medicine for diabetes and its complications by reducing oxidative stress in beta-cells of the pancreas.

• Journal of Nutrition and Health
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• 제27권9호
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• pp.883-891
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• 1994

The number of diabetics in Korea is about 3 to 5 percent of the population, and the incidence is increasing yearly due to changes of life style and food intake. Diet is a key element in the management of diabetes, yet the appropriate diet for diabetes remains controversial. We have recently shown that a diet rich in protein of animal origin(casein) seems beneficial to controling plasma glucose and lipids in streptozotocin-induced diabetic rats. It therefore seemed desirable to find out whether the beneficial effect of high casein diet in experimental diabetes could also be reproduced with a vegetable source of protein(soy). The purpose of this study is to compare these results with the results of our previous study. In the present study, non-diabetic and streptozotocin-induced diabetic rats were studied in order to examine the effects of altering the level(20% vs 60%) of dietary soy protein on blood glucose, lipids, and hormones. Results of the present study showed that a high soy protein diet decreased triglyceride concentration in diabetic rats. However, diabetic rats fed a high soy protein diet were not hypocholesterolemic compared to rats fed a control diet. Moreover, diabetic rats fed a high soy protein diet had significantly increased plasma glucose concentration compared to rats fed a control diet. This study was not able to discern a specific effect of dietary protein level on insulin, glucagon, or insulin/glucagon ratio. Except for the hypotriglyceridemic effect, the results were not similar to the findings of our previous study which showed a beneficial effect on streptozotocin-induced diabetic rats fed a high casein diet.

• The Korean Journal of Physiology and Pharmacology
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• 제4권3호
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• pp.263-270
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• 2000

To evaluate the involvement of nitric oxide production on the endothelium-dependent relaxation in diabetes, we have measured vascular and endothelial function and nitric oxide concentration, and the expression level of endothelial nitric oxide synthase in the streptozotocin-induced diabetic rats. Diabetic rats were induced by the injection of streptozotocin (50 mg/kg i.v.) in the Sprague-Dawley rats. Vasoconstrictor responses to norepinephrine (NE) showed that maximal contraction to norepinephrine $(10^{-5}\;M)$ was significantly enhanced in the aorta of diabetic rats. Endothelium-dependent relaxation induced by acetylcholine was markedly impaired in the aorta of diabetic rats, these responses were little improved by the pretreatment with indomethacin. However, endothelium-independent relaxation induced by nitroprusside was not altered in the diabetic rats. Plasma nitrite and nitrate $(NO_2/_3)$ levels in diabetic rats were significantly lower than in non-diabetic rats. Western blot analysis using a monoclonal antibody against endothelial cell nitric oxide synthase (eNOS) revealed that the protein level was lower in the aorta of diabetic rats than in non-diabetic rats. These data indicate that nitric oxide formation and eNOS expression is reduced in diabetes, and this would, in part, account for the impaired endothelium-dependent relaxation in the aorta of streptozotocin-induced diabetic rats.

• 대한한의학회지
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• 제27권1호
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• pp.91-103
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• 2006

Objectives : Etiological studies of diabetes and its complications showed that oxidative stress might play a major role. Therefore, many effects have been fried to regulate oxygen free radicals for treating diabetes and its complications. Because Holotrichia has been known to be effective for the treatment of diabetes, the methanol extract of Holotrichia was tested for its effectiveness in reducing the oxidative stress induced by streptozotocin. Methods : Holotrichia was washed, dried in the shade and crushed. The crushed Holotrichia was extracted 3 times, each time with 3 volumes of methyl alcohol at $60^{\circ}C$ for 24h. The extract was filtered and evaporated under a reduced pressure using a rotary evaporator to yield 17 g. Holotrichia extract was oral-administed to the diabetic rats induced by streptozotocin 50 mg per 1 kg of body weight for 20 days. The efficacy of the Holotrichia extract was examined with regard to the enzymatic pathways involved in the oxygen free radical production and the glutathione balance. Results : The Effects of the methanol extract of Holotrichia in streptozotocin-induced diabolic rats with regards to body weight, blood glucose level, hepatic lipid peroxide level, hepatic superoxide anion radical content. hepatic xanthine oxidase activity and type conversion rate, hepatic glutathione level, hepatic aldose reductase activity, and hepatic sorbitol dehydrogenase activity were shown to be good enough to cure and prevent the diabetes and its complications. Conclusions : These results indicated that Holotrichia might reduce the oxidative stress in the tissues and organs by regulating the production of oxygen free radicals. Especially, Holotrichia might prevent and cure the diabetes and its complications by reducing the oxidative stress in the ${\beta}$-cells of pancreas. Some suggestions on biophoton experiments were made.

• 한국식품과학회지
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• 제34권1호
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• pp.103-108
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• 2002

본 연구는 streptozotocin으로 유발된 당뇨 흰쥐에게 흑진미 과피에서 추출한 각 용매 분획물을 14일간 경구투여한 후 혈당과 지질함량을 분석하였으며 다음과 같은 결론을 얻었다. 당뇨 대조군과 비교시 모든 용매 분획물 투여군에서 실험동물의 체중이 증가되었으나 유의적인 차이를 보이지는 않았다. 또한 acetone과 anthocyanin 분획물 투여시 실험 14일째에 혈당, 중성지방 및 유리지방산이 당뇨 대조군과 비교시 유의적으로 감소되었으며, 혈장 HDL-cholesterol 함량은 유의적으로 증가하였다. 이같은 결과는 흑진미 과피에 존재하는 특정 생리활성 물질이 실험 당뇨쥐의 혈당 및 혈중 지질함량 감소에 효과가 있음을 보여주고 있다.

• 한국식품영양과학회지
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• 제31권6호
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• pp.1112-1118
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• 2002

민들레의 추출물을 급여한 흰쥐에게 streptozotocin으로 당뇨를 유발하여 장내 미생물 균총에 미치는 영향을 구명하기 위하여 Wistar계의 이유한 웅성 흰쥐 64마리를 난괴법으로 8군으로 나누어 streptozotocin(55 mg/kg BW)과 식이 kg당 11.45g의 민들레가 함유되도록 부위와 분획별로 나누어 식이에 첨가하여 50일간 사육하였다. 당뇨-대조군의 총혐기성균은 14일간 증가하다가 당뇨로 인하여 감소를 나타내었으며 잎 추출물 급여시 50일에는 당뇨-대조군에 비하여 증가되었다. 뿌리에틸아세테이트 추출물 급여군은 당뇨-대조군에 비하여 총혐 기성균수가 많은 것으로 나타났다. 민들레의 잎과 뿌리의 추출물 급여초기인 14일의 총호기성균은 당뇨-대조군에 비하여 높았으나 35일에는 당뇨-대조군에 비하여 낮은 것으로 나타났으며 50일에 총호기성균수의 변화결과는 총혐기성균의 변화양상과 유사한 것으로 관찰되었다. 장내 미생물의 변화는 당뇨가 유발된 50일에 당뇨-대조군에 비하여 민들레 잎-열수 추출물 군과 일-에틸아세테이트 추출물군에서 Lactobacillus 증가가 현저하였으며, E. cofi 감소는 잎과 뿌리의 열수 추출물군과 에틸아세테이트 추출물군이 당뇨-대조군과 유사한 수준이며 특히 열수 추출물군의 E. coli억제효과가 관찰되었다. 본 실험 결과 민들레추출물이 당뇨유발된 흰쥐의 장내 미생물에 유익한 효과로 숙주의 감염에 대한 저항력이 있는 것으로 나타났다.

• 대한본초학회지
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• 제23권4호
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• pp.103-112
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• 2008

Objectives: Indongdeungjikolpi-tang(IJT) is used as a traditional treatment of diabetes in oriental clinincs. This study aimed to evaluate the anti-diabetic effect of Indongdeungjikolpi-tang(IJT) in streptozotocin(STZ)-induced diabetic rats. Methods: Diabetes was induced by intraperitoneal injection of streptozotocin(STZ; 60 mg/kg BW) to Sprague-Dawley male rats. Experimental animals(six per group), were treated by oral administration of IJT(100 and 500 mg/kg BW) and glibendimide(3 mg/kg), a known antidiabetic drug for comparison, during 4 weeks. We measured the levels of glucose, insuline, triglyceride, creatinine and urea in sera of each group. An oral glucose tolerance test(OGTT) was also performed in all groups. Results: IJT(100 and 500 mg/kg) significantly reduced blood glucose levels and increased plasma insulin levels in STZ-induced diabetic rats. IJT also significantly reduced the plasma levels of tryglyceride, creatinine and urea in STZ-induced diabetic rats. The OGTT results showed a significant improvement in glucose tolerance in IJT-administrated rats. Conclusions: These data indicate that IJT may improve glocose homeostasis in STZ-induced diabetes, which could be associated with stimulation of insulin secretion.

• 대한약리학회지
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• 제27권1호
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• pp.1-5
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• 1991

Streptozotocin(STZ)-유발 당뇨쥐에서 시상하부의 norepinephrine(NE) 대사를 기초 NE 함량, NE 교체율, in vivo tyrosine hydroxylase(TH) 활성을 그 지표로 하여 조사하였다. STZ (60 mg/kg, iv)로 당뇨를 유발한 후 4주까지 기초 NE 함량은 유의한 변화가 없었다. 그러나 당뇨유발 후 1주째에 측정한 NE 교체율은 대조치의 62%(p<0.01), in vivo TH 활성은 대조치의 34% (p<0.05)로 감소하였다. 이상의 결과로 본 실험에서 측정한 NE 대사의 세 지표 중에서 in vivo TH 활성이 STZ-유발 당뇨쥐의 시상하부 NE 대사의 변화를 가장 민감하게 반영하였다.

• 대한한방내과학회지
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• 제27권4호
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• pp.811-821
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• 2006

Objectives : Diabetes is a disease in which the body does not produce or properly use insulin. Etiological studies of diabetes and its complications showed that oxidative stress might play a major role. Therefore, many methods have been tried to regulate oxygen free radicals for treating diabetes and its complications. Because Mori foliumhas been known to be effective for the treatment of diabetes, the methanol extract of Mori folium was tested for its effectiveness in reducing the oxidative stress induced by streptozotocin. Methods : The crushed Mori folium was extracted 3 times, each time with 3 volumes of methyl alcohol at $60^{\circ}C$ or 24 h. The extract was filtered and evaporated under reduced pressure using a rotary evaporator to yield 11.7 g. Mori folium extract was oral-administered to diabetic rats induced by streptozotocin at 100 mg per 1 kg of body weight for 20 days. The efficacy of the Mori foliumextract was examined with regard to the enzymatic pathways involved in oxygen free radical production and glutathione balance. Results : The effects of the Mori foliumin streptozotocin-induced diabetic rats with regards to body weight, blood glucose and insulin level, hepatic lipid peroxide level, hepatic glutathione level, hepatic glutathione S-transferase and glutathione peroxidase level, hepatic aldose reductase activity, and hepatic sorbitol dehydrogenase activity were shown to be good enough to cure and prevent diabetes and its complications. Conclusions : These results indicated that Mori folium might reduce oxidative stress in tissues and organs by regulating the production of oxygen free radicals. Especially Mori folium might prevent and cure diabetes and its complications by reducing oxidative stress in the ${\beta}-cells$ of the pancreas.

• 대한한방내과학회지
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• 제29권1호
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• pp.90-103
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• 2008

Objective : This study wascarried out to understand the effect of Sopyung-tang (SPT) on blood glucose & antioxidant enzyme activities in streptozotocin-induced diabetic rats. Methods : SD rats were separated into three groups, each with 20 rats. Except the normal group, the other two groups were intra-peritoneally injected with streptozotocin 6mg/kg. The experimental group was treated with SPT extract 500mgkg/day for 4 weeks. The normal and control groups were treated with saline 500mg/kg/day for 4 weeks. Changes of plasma glucose level and body weight were observed. After4 weeks, liver and kidney weight, antioxidant enzyme activities, and survival rate were observed with histological changes on liver, kidney and pancreas. Results : In the experimental group, body weight and survival rate increased, while plasma glucose level decreased significantly. Liver and kidney weight, XOD activity decreased in the experimental group compared to the control. GSH-px and CAT activities andinsulin-immunoreactive granules in ${\beta}-cells$ increased significantly in the experimental group compared to the control. Conclusions : This study shows that SPT might be effective for treatment of diabetes and its complications, as well as reduction of oxidative stress.