• Title, Summary, Keyword: Streptozotocin

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Hypoglycemic Action of the Fat Soluble Fraction of Panax Ginseng C.A. Meyer in Streptozotocin Induced Diabetic Rats (Streptozotocin 유발 당뇨병 쥐에서의 인삼 지용성분획의 혈당 강하작용)

  • 주충노;김선진
    • Journal of Ginseng Research
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    • v.17 no.2
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    • pp.101-108
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    • 1993
  • This study was made to understand a hypoglycemic action of the fat soluble fraction of Panax ginseng C.A. Meyer in streptozotocin induced diabetic rats by determining the activities of several enzymes related to carbohydrate and lipid metabolism as well as several blood component levels such as glucose and ketone bodies, and non-esterified fatty acids. Albino rats (Sprague Dawley, 170-200g, 3) were injected once with 70mg streptozotocinhg body weight intraperitoneally and fed with ordinary diet for 7 days, and then the fat soluble fraction (5 mg~20 mg/day/rat) was injected intraperitoneally once a day for three days to rats having high blood glucose level over 340 mg/100ml. After a final injection of the fat soluble fraction, rats u.ere starved for 16 hours followed by the analysis of blood serum and liver enzymes. It was found that increased levels of glucose, ketone bodies and free fatty acids in streptozotocin induced rats were decreased appreciably by administration of the fat soluble fraction. However, the amount of administered fat soluble fraction did not show any significantly different hypoglycemic action. Decreased activities of glucokinase, phosphofructokinase, pyruvate kinase, 6-phosphogluconate dehydrogenase and acetyl CoA carboxylase of the liver of streptozotocin induced diabetic rats were greatly modified suggesting that a hypoglycemic action of the fat soluble fraction was also appreciable as ginseng saponin fraction. We also compared a hypoglycemic action of the fat soluble fraction prepared from American ginseng and Chinese ginseng with that of Korean pain ginseng. 핀o significant difference of the hypoglycemic activity was observed between the above ginseng fat soluble fractions, suggesting that a study of the fat soluble fraction might be one of the most interesting subjects relating to diabetic hyperglycemia in the near future.

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Hypoglycemic Effect of Fractions of Cassia tora Extract in Streptozotocin-Induced Diabetic Rats (결명자 분획물이 당뇨 유발 흰쥐의 혈당에 미치는 영향)

  • 임숙자;한혜경
    • Korean journal of food and cookery science
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    • v.13 no.1
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    • pp.23-29
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    • 1997
  • The hypoglycemic effect of fractions of methanol extract of Cassia tora was investigated in diabetic rats. Sprague-Dawley male rats weighing 180∼230 g were divided into 6 groups. Diabetes was induced in the male rats by intravenous injection of streptozotocin at a dose of 45 mg/kg dissolved in citrate buffer (pH 4.5). The diabetic animals then had plasma glucose concentration of above 300 mg/㎗. Fractions of methanol extract of Cassia tora were administered orally into the diabetic rats for 14 days after streptozotocin injection. The food intake and body weight gain were monitored and plasma levels of glucose, triglyceride, free fatty acid, HDL-cholesterol, cholesterol and ALT activity were determined. Levels of glycogen, cholesterol and triglyceride in liver were analysed. Weights of liver and kidney were lighter in all the fraction-administered groups than streptozotocin-control group. Plasma glucose level was significantly decreased by the administration of butanol fraction at 14 days. Plasma triglyceride levels were lower in chloroform, butanol and H$_2$O fraction-administered groups compared to streptozotocin-control group. Plasma cholesterol and HDL-cholesterol levels were not significantly different in all groups. Administrations of each of the four fractions have decreased plasma free fatty acid level, ALT activity and liver triglyceride levels in the diabetic rats. Liver glycogen levels in chloroform, butanol and H$_2$O fraction-administered groups were higher than streptozotocin-control group. It is suggested from the results that butanol fraction of methanol extract of Cassia tora may contain the antihyperglycemic compounds.

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Poria cocos Herbal Acupuncture Prevents ${\beta}$-cell Damage on Streptozotocin-induced Diabetic Rat (Streptozotocin 유도 당뇨 흰쥐에서 복령약침의 ${\beta}$-cell 손상 방지 효과)

  • Seo, Chang-Wan;Seo, Byung-Kwan;Kim, Jong-In;Kang, Sung-Keel
    • Journal of Acupuncture Research
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    • v.26 no.5
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    • pp.39-47
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    • 2009
  • 목적 : 정상 췌장조직 속에 존재하는 췌장 소도세포들을 파괴시켜 고혈당을 유발시키고 복령 물추출물로 약침을 시술하여 췌장 조직의 보호효과와 항당뇨 효과를 살펴보고자 실험을 진행하였다. 방법 : 5주령의 Sprague-Dawley rat을 통제된 실험실 환경에 적응시킨 후 1주일간 복령약침액(125mg/kg 복령약침군 및 250mg/kg 복령약침군)을 좌우 신수($BL_{23}$)에 교대로 각각 피하에 약침하고 streptozotocin을 복강내 주사하여 3일 후 diabetes mellitus 유도 정도를 평가하고 2주일간 추가 치료를 진행 한 뒤, 혈액지표(plasma glucose, insulin, TG, TC, NEFA, sGOT, sGPT, ALP, BUN, CRE)와 췌장조직의 형태학적 분석 및 염증 관련 단백질의 발현을 평가하였다. 결과 : 복령약침군(125mg/kg 복령약침군 및 250mg/kg 복령약침군)에서 insulin과 triglyceride, NEFA 수치가 유의하게 감소하였으며 간 기능 효소수치인 sGOT가 감소하는 경향을 나타내었으나, 신장기능지수는 유의한 감소를 나타내지 않았다. 특히 250mg/kg 복령약침군에서 streptozotocin 투여로 인한 pancreatic islet의 형태학적 변성이 현저하게 개선되었다. Western blot 결과 JNK-2, P-JNK-2, P-JNK-1, ERK1/2 및 phosphorylated ERK1의 발현이 감소되었다. 결론 : 복령약침이 고인슐린혈증과 고지질질혈증을 개선시키고 streptozotocin에 의한 pancreatic islet의 파괴를 억제하며, 이는 inflammation-related transcription factor인 NF-kB와도 관련이 있는 것으로 판단된다. 향후 복령약침의 항당뇨 효과와 그 기전에 관한 추가 연구가 필요할 것으로 사료된다

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The Effects of Prunus on Diabetic Nephropathy Rats Induced by Unilateral Nephrectomy and Streptozotocin (도인(挑仁)이 일측 신절제와 streptozotocin으로 유발된 당뇨병성 신증 Rat에 미치는 영향)

  • Kim, Nam-Kyu;Oh, Jae-Seon;Jeon, Sang-Yun
    • The Journal of Internal Korean Medicine
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    • v.35 no.4
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    • pp.519-531
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    • 2014
  • Objectives: Diabetic nephropathy is the most common cause of end stage renal disease. Transforming growth factor (TGF)-${\beta}1$, type IV collagen, advanced glycation end-products (AGEs), and angiotensin II type 1 receptor (AT1) are the main factors of diabetic nephropathy. We investigated the effects of Prunus on renal function and histopathological changes of diabetic nephropathy rat model induced by unilateral nephrectomy and streptozotocin. Methods: Diabetes was induced in male Sprague-Dawley rats ($290{\pm}10g$) by injecting streptozotocin (55 mg/kg) into the tail vein after unilateral nephrectomy. Rats were divided into 3 groups (n=6): normal, control, and Prunus. After 8 weeks of oral administration of Prunus extract on the Prunus group from 3 days after streptozotocin injection, we checked weight, 24 hrs urine, blood biochemistry and renal tissue to evaluate renal function and histopathological changes by examining parameters including albuminuria, BUN, creatinine, cholesterol, low density lipoprotein (LDL), triglyceride, TGF-${\beta}1$, type IV collagen, AGEs, and AT1. We also measured mRNA expression of TGF-${\beta}1$, type IV collagen, AGEs, and AT1 by Real Time polymerase chain reaction (RT-PCR). Results: Prunus decreased the amount of 24 hrs proteinuria, and inhibited histopathological changes of diabetic nephropathy including the expression and accumulation of TGF-${\beta}1$, type IV collagen and AGEs which could promote development of diabetic nephropathy. Prunus also inhibited mRNA expression of TGF-${\beta}1$, type IV collagen. Conclusions: These findings suggest that Prunus might protect the renal function and inhibit the development of renal injury by regulating factors including TGF-${\beta}1$, type IV collagen, AGEs, except AT1, so Prunus can be used for diabetic patients to prevent the progression of diabetic nephropathy.

Hypoglycemic Activity of Opuntia ficus-indica var.sabotan on Alloxan- or Streptozotocin-Induced Diabetic Mice (Alloxan 및 Streptozotocin 유도 당뇨모델 동물에서 손바닥 선인장의 혈당강하 효과)

  • Shin, Ji-Eun;Han, Myung-Joo;Lee, In-Kyung;Moon, Young-In;Kim, Dong-Hyun
    • Korean Journal of Pharmacognosy
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    • v.34 no.1
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    • pp.75-79
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    • 2003
  • Hypoglycemic activity of Opuntia ficus-indica var. sabotan on alloxan or streptozotocin-induced diabetic mice was investigated. Fructus and folium of Opuntia ficus-indica vars. sabotan inhibited intestinal ${\alpha}-glucosidase$ of rats as well as glucose elevation in blood of normal mice, Opuntia ficus-indica var. sabotan exhibited inhibitory activities on streptozotocin-induced diabetic mice rather than on alloxan-induced diabetic mice loaded with maltose and sucrose. Its folium was more effective than its fructus. These results suggest that Opuntia ficus-indica var. sabotan might be effective on diabetic mellitus.

Blood Glucose Control and Increase Immunity Effects of β-glucan added Cooked Barley Noodle in High-Fat Diet and Streptozotocin-Induced Diabetic Mice (고지방식이와 streptozotocin으로 유도된 당뇨 생쥐에서 β-glucan이 첨가된 보리숙면의 혈당조절과 면역력증진 효과)

  • Park, Chungmu;Yoon, Hyunseo
    • Journal of The Korean Society of Integrative Medicine
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    • v.6 no.2
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    • pp.89-98
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    • 2018
  • Purpose : This study was designed to examine the blood glucose control and increase immunity effects of ${\beta}-glucan$ added cooked barley noodle in streptozotocin-induced diabetes mice with a high-fat diet. Method : Forty-eight male ICR mice (6-week-old) were fed AIN-93 diet for 4 weeks. Mice were divided into six groups: normal, diabetic, cooked barley noodle, ${\beta}-glucan$ (5 %) control and two experimental groups (${\beta}-glucan$ 2.5 % and 5 %, cooked barley noodle contained diet with ${\beta}-glucan$ 2.5 % and 5 % w/w). Diabetes mellitus was induced by intraperitoneal injection of streptozotocin (150 mg/kg). Result : Blood glucose level was significantly decreased in groups consuming cooked barley noodles, but no significant difference was exhibited in diabetic and ${\beta}-glucan$ control group. These results were in accordance with the result of oral glucose tolerance test. Blood interfereon $(IFN)-{\gamma}$ was measured in order to identify increase immunity effect of ${\beta}-glucan$ in diabetic mice. Inhibited $IFN-{\gamma}$ concentration was recovered in cooked barley noodle and ${\beta}-glucan$ control group. Moreover, $IFN-{\gamma}$ concentration was dramatically elevated in ${\beta}-glucan$ contained cooked barley noodle groups in a dose dependent manner. Streptozotocin induced AST and ALT activities were decreased in ${\beta}-glucan$ contained cooked barley noodle groups with a strong lipid lowering effect. Conclusion : Although addition of ${\beta}-glucan$n did not give any significant synergistic effect on cooked barley noodle in blood glucose regulation, suppressed $IFN-{\gamma}$ production by STZ was dramatically enhanced by ${\beta}-glucan$ supplementation in a dose dependent manner. Liver function and blood lipid profile were also in accordance with the increase immunity effect of ${\beta}-glucan$. Consequently, ${\beta}-glucan$ added cooked barley noodle can be consumed as good diets for patients with chronic diseases with reduced immunity.

Regulation of Insulin-Sensitive Cyclic Nucleotide Phosphodiesterase in Adipocytes of Streptozotocin-Induced Diabetic Rats (Streptozotocin으로 당뇨병을 유발시킨 흰쥐의 지방세포에서 일어나는 Insulin-Sensitive Phosphodiesterase의 조절에 관한 연구)

  • Park, Kyung-Sun;Lee, Myung-Soon;Kim, Kyung-Hwan
    • The Korean Journal of Pharmacology
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    • v.29 no.2
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    • pp.253-261
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    • 1993
  • Possible changes in the role of insulin-sensitive cyclic nucleotide phosphodiesterase(PDE) in mediating the antilipolytic action of insulin were investigated in adipocytes from streptozotocin-induced diabetic rats. Isolated adipocytes prepared from epididymal adipose tissue were incubated, with or without insulin, at $37^{\circ}C$ for 15 min following pretreatment with various drugs or toxins, and three (plasma membranes, microsomal membranes, and cytosol) fractions prepared by differential centrifugation were then assayed for cAMP phosphodiesterase activity. The PDE activities only in the crude microsomal (P2) fractions were activated by insulin both in diabetic and control rats. The basal PDE activities in P2 fractions of adipocytes from diabetic rats were higher than those from control rats, although the maximal effects observed at 2 nM of insulin, $100\;{\mu}M$ of isoproterenol or the combination of both were not significantly different from each other. The insulin-stimulated PDE activities in P2 fractions of adipocytes from diabetic rats were not changed by PIA, a $A_{1}$ adenosine receptor agonist, whereas they were decreased to the basal PDE activities in those from control rats. In addition, the adipocytes from diabetic rats showed an increased sensitivity to pertussis toxin compared to those from controls. There were no differences between diabetic and control rats in the sensitivity of adipocytes to cholera toxin. These data indicate that the impaired signalling through inhibitory receptors such as adenosine receptors in adipocytes from streptozotocin-induced diabetes relates to the loss or the decreased function of $G_i$ proteins, and leads to the increased activity of the insulin-dependent PDE at the basal states.

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Hypoglycemic and Hepatoprotective Effects of Betaine on Streptozotocin-Induced Diabetic Rats (Streptozotocin-유발 당뇨쥐의 베타인 첨가에 의한 항당뇨 및 간보호 효과)

  • Jeong, Jae-Jun;Kim, Yong-Taek;Seo, Won-Seok;Yang, Hyun-Ju;Lee, Yong-Soo;Cha, Jae-Young
    • Journal of Life Science
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    • v.16 no.5
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    • pp.767-772
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    • 2006
  • This study was to investigate the effect of betaine on the hypoglycemia and hepatoprotection of streptozotocin(STZ)-induced diabetic rats. Male Sprague-Dawley rats weighing around 280 g were randomly assigned to the three experimental groups: a healthy normal group and two groups with STZ-induced diabetes and fed either control diet or betaine diet. Betaine given to the STZ-diabetic rats had significant effect in lowering the serum glucose concentrations compared to the STZ-diabetic rats. The alanine aminotransferase (AST) and aspartate aminotransferase (ALT) activities and triglyceride contents in serum were dramatically higher in the STZ-diabetic rats, but these increases in relation to diabetes also decreased in the STZ-diabetic rats fed betaine. However, the total-cholesterol concentration in the STZ-diabetic rats was even increased by betaine. The morphology of the pancreatic islets in the normal rats showed a typical round form, but most of the islets in the STZ-diabetic rats showed severe morphological alterations by being markedly destroyed. However, the islet morphology of STZ-diabetic rats given betaine mostly maintained a normal rounded appearance. The present study strongly suggests that the administration of betaine showed a moderate hypoglycemic effect by protecting the pancreatic beta-cells by morphological examination from STZ-induced destruction.