• Journal of Nutrition and Health
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• v.33 no.7
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• pp.712-716
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• 2000

The Purpose of this study is to investigate the effect of soluble dietary fiber psyllium on insulin sensitivity and skeletal muscle glucose transporter 4(GLUT4) protein expression in stroke-prone hypertensive rats(SHRSP) fed a high-fat diet containing 5% of psyllium or cellulose from five to nine weeks of age. Obtained results were as follows : (1) In the psyllium diet group fasting plasma glucose level was significantly reduced and glucose levels upon oral glucose tolerance test were significantly lower than cellulose diet group at 30 min(p<0.05) and 60 min(p<0.01) (2) Skeletal muscle GLUT4 contents were significantly increased in the soleus(slow twitch) and extensor digitorum longus(fast twitch) muscle of psyllium diet group. (3) However there was no difference in insulin levels in the fasting and oral glucose tolerance test. These results indicated that psyllium diet improves peripheral insulin sensitivity but not insulin secretion. In conclusion our present finding suggest that soluble fiber diet is effective to increase insulin sensitivity in SHRSP. From these results it was suggested that soluble dietary fiber supplementation effectively prevents insulin resistance.

• Journal of Nutrition and Health
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• v.32 no.1
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• pp.10-16
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• 1999

This study was conducted to figure out the differences of the BMI, blood lipids, blood pressure and nutrient intakes by serum insulin concentration among adults in Korea. Ninety-three subjects(male : n=37, female : n=56) participated in this study. The subjects were grouped by serum insulin concentrations into two groups-hyperinsulinemia group(n=17) and normoinsulinemia group(n=76). Anthropometric measurements, blood lipid profiles, blood pressure, oral glucose tolerance test, and daily nutrient intakes were analyzed. And serum glucose and insulin secretion pattern as shown through and oral glucose tolerance test were performed. BMI (p<0.05) and WHR(p<0.01) were significantly higher in hyperinsulinemic group than in normoinsulinemia group. There was no differences in fasting blood glucose level between groups, but total glucose area (p<0.001) and insulin glucose resistance(p<0.001) were significantly higher in hyperinsulinemia group than in normoinsulinemia higher in hyperinsulinemia group, but HDL-cholesterol(p<0.05), and systolic blood pressure(p<0.05) were significantly higher in hyperinsulinemia group, but HDL-cholesterol(p<0.001) was significantly lower in hyperinsulinemia group. They showed significant differences in energy, carbohydrate, potassium, riboflavin, niacin and dietary fiber intakes(p<0.05), the intake of those nutrients were low in normoinsulinemia group. Further investigation is necessary to determine the effects of amounts and types of carbohydrate and dietary fiber on serum insulin concentrations.

• The Journal of Internal Korean Medicine
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• v.23 no.1
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• pp.141-145
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• 2002

Diabetic Ketoacidosis(DKA), one of acute complications of diabetes mellitus(DM) occurs mostly in insulin dependent diabetes mellitus (IDDM) patients. Its clinical symptoms are hyperglycemia, ketonemia or ketonuria, metabolic acidosis, etc. The interaction of lack of insulin, excessive secretion of insulin antagonic hormone and dehydration cause body fluid loss and electrolyte, typical symptom of DKA as polyuria, polydipsia, nausea, vomiting, abdominal pain occur. As a result, prompt supply of fluid and insulin by intravenous injection should be conducted for treatment. It is still an emergent disorder whose mortality is still 10 to 15%, though is has decreased compared to the past. We treated a female patient who has DKA, had withdrawn insulin pump therapy. We report a case of DKA with a brief review of related literatures.

• Applied Chemistry for Engineering
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• v.20 no.6
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• pp.581-585
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• 2009

Diabetes is caused by the lack of insulin secretion or the reduction in its sensitivity. The recent treatments for diabetes do not fulfill the requirements for the maintaining of normal blood glucose level. The most frequently used treatment for type I diabetes is an insulin injection. However, the insulin injection often involves the life-threatening risk and the low compliance of patients. Accordingly, extensive studies have been done to overcome the shortcomings of the injection. A representative approach is to employ self-regulated insulin delivery systems. This report includes the principles of glucose-responsive release in the self-regulated insulin delivery systems.

• Asian-Australasian Journal of Animal Sciences
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• v.22 no.10
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• pp.1429-1436
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• 2009

Adiponectin is an adipocyte-derived protein that has a regulatory role in energy homeostasis and influences insulin sensitivity. Its effects on glucose utilization and lipid metabolism are mediated by AdipoR1 and AdipoR2. How insulin affects adiponectin gene expression and secretion is still controversial. This study was conducted to determine the expression of adiponectin, AdipRs and $PPAR-\gamma$ during the differentiation of bovine preadipocytes and the effect of insulin on expression of these genes in bovine adipocytes. The bovine preadipocytes started to accumulate lipids three days after differentiation was induced, with increased expression of adiponectin, AdipoR2 and $PPAR-\gamma$ mRNAs. Insulin decreased the expression of adiponectin mRNA in a dose- and time-dependent fashion, and the inhibition was detectable at insulin concentrations as low as 10 nM and as early as 2 h after addition of 100 nM insulin. Insulin also inhibited the expression of AdipoR2 mRNA at concentrations from 1 to 1,000 nM or 24 h after addition of 100 nM insulin, but did not affect the expression of AdipoR1 in bovine adipocytes. Inhibition of PI3K with LY294002 reversed the inhibition of adiponectin and AdipoR2 mRNA expression by insulin. These results suggest that insulin suppresses the expression of adiponectin and AdipoR2 at least partially via the PI3K signal pathway.

• Korean journal of applied entomology
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• v.61 no.1
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• pp.85-90
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• 2022

Insulin and insulin-like growth factor-1 (IGF-1) are hormones that play an important role in the physiological regulation of metabolism, growth, and longevity in vertebrates. Likewise, insulin-like peptides (ILPs), which are structurally similar to insulin and IGF-1, are crucial in insect physiology. In this review, we present an integrated summary of insect ILPs and their receptor signaling, which has been shown to be comparable to insulin and IGF-1 receptor signaling in vertebrates based on genetic studies of Drosophila melanogaster. Additionally, we review the control of ILP synthesis and secretion in the brain in response to nutrition, as well as the ILPs' physiological role in insect metabolism. Moreover, we discuss the contribution of ILPs to growth, development, reproduction, and diapause. Finally, we consider the possibility of targeting ILP receptor signaling in pest management.

• Journal of the Korean Society of Food Science and Nutrition
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• v.36 no.6
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• pp.703-707
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• 2007

This study was performed to investigate the effect of silk protein hydrolysates hydrolyzed by protease on blood glucose level, serum insulin and leptin secretion in the OLETF rats. Twenty seven week-old-male OLETF rats were divided in three groups: diabetic control, 0.5% and 0.8% silk protein hydrolysates groups that were fed daily for 19 weeks. Body weight increased in the 0.5% and 0.8% silk protein hydrolysates fed groups compared with diabetic control group. Food and water intake were not different among diabetic and silk protein hydrolysates groups. In random state, the blood glucose levels in silk protein hydrolysates fed groups were lower than diabetic control group; however, the blood glucose in the three groups were not different in fasting state. Also silk protein hydrolysates improved the glucose tolerance in OLETF rat. The silk protein hydrolysates did not influence serum lipids while serum insulin and leptin levels were increased in the experimental OLETF rats. These results suggested that the administration of silk protein hydrolysates solution reduced significantly (p<0.05) an increasing rate of blood glucose level by stimulating the insulin secretion and increasing the serum leptin level.

• The Journal of Dong Guk Oriental Medicine
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• v.7 no.1
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• pp.75-86
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• 1998

Studies were conducted on anti-dibetic effect of the water extract from leaves of Eriobotryae folium, which had been used in Korea as a remedy for dibetes. The extract was found to inhibit the increase in the plasma level of sugar bu the not the decrease in the plasma level of insulin in alloxan-induced dibetic rats. Also, we investigated the in vivo effect of an aqueous extract (referred to as EF) from Eriobotryae folium on glucokinase and hexokinase activities of diabetes mellitus induced by interleukin-$1{\beta}$ ($IL-1{\beta}$). After 1 week of $IL-1{\beta}$ injection, the levels of serum glucose concentration and insulin secretion were dramatically increased. However, the insulin secretion was decreased with administration of EF. The level of glucose concentration was decreased by EF administration. Furthermore, it was observed that EF was effective in recovering the levels of insulin secretion. Enzyme activities of the glucokinase and hexokinase, which are key enzymes of glucose phosphorylastion, were decreased by $IL-1{\beta}$. EF administration to the mice allowed proportional increasing by stimulation of induction of enzyme activities as high as normal group. These results suggested that EF is highly effective in treatment of diabetes mellitus induce by $IL-1{\beta}$.

• The Korean Journal of Physiology and Pharmacology
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• v.6 no.6
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• pp.311-317
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• 2002

This study was performed to investigate the pancreatic exocrine dysfunction in streptozotocin- induced diabetic rats. Changes in pancreatic enzymes secretion and in pancreatic enzymes content were observed. The output and the tissue content of amylase were significantly reduced in diabetic rats, while the output and the content of lipase were increased. Plasma secretin and cholecystokinin (CCK) concentrations of diabetic rats were significantly increased compared to those of normal rats. The altered pancreatic exocrine function was abolished by the exogenous insulin administration. The exogenous insulin also restored the increased plasma secretin and CCK concentrations. From the above results, it is suggested that, in streptozotocin-induced diabetic rats, anticoordinated changes in pancreatic enzymes secretion as well as pancreatic enzymes content are attributable to insulin deficiency and that the insulin deficiency is responsible for the increased plasma concentrations of both secretin and CCK. However, it is not clear whether the elevated plasma secretin and CCK concentrations played a direct role in changes of pancreatic exocrine function.

• Toxicological Research
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• v.34 no.2
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• pp.173-182
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• 2018

Valproic acid (VPA) plays a role in histone modifications that eventually inhibit the activity of histone deacetylase (HDAC), and will affect the expressions of genes Pdx1, Nkx6.1, and Ngn3 during pancreatic organogenesis. This experiment was designed to study the effect of VPA exposure in pregnant rats on the activity of HDAC that controls the expression of genes regulating the development of beta cells in the pancreas to synthesize and secrete insulin. This study used 30 pregnant Sprague-Dawley rats, divided into 4 groups, as follows: (1) a control group of pregnant rats without VPA administration, (2) pregnant rats administered with 250 mg VPA on day 10 of pregnancy, (3) pregnant rats administered with 250 mg VPA on day 13 of pregnancy, and (4) pregnant rats administered with 250 mg VPA on day 16 of pregnancy. Eighty-four newborn rats born to control rats and rats administered with VPA on days 10, 13, and 16 of pregnancy were used to measure serum glucose, insulin, DNA, RNA, and ratio of RNA/DNA concentrations in the pancreas and to observe the microscopical condition of the pancreas at the ages of 4 to 32 weeks postpartum with 4-week intervals. The results showed that at the age of 32 weeks, the offspring of pregnant rats administered with 250 mg VPA on days 10, 13, and 16 of pregnancy had higher serum glucose concentrations and lower serum insulin concentrations, followed by decreased concentrations of RNA, and the ratio of RNA/DNA in the pancreas. Microscopical observations showed that the pancreas of the rats born to pregnant rats administered with VPA during pregnancy had low immunoreaction to insulin. The exposure of pregnant rats to VPA during pregnancy disturbs organogenesis of the pancreas of the embryos that eventually disturb the insulin production in the beta cells indicated by the decreased insulin secretion during postnatal life.