• Molecules and Cells
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• 제40권2호
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• pp.123-132
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• 2017

Insulin signaling is coordinated by insulin receptor substrates (IRSs). Many insulin responses, especially for blood glucose metabolism, are mediated primarily through Irs-1 and Irs-2. Irs-1 knockout mice show growth retardation and insulin signaling defects, which can be compensated by other IRSs in vivo; however, the underlying mechanism is not clear. Here, we presented an Irs-1 truncated mutated mouse ($Irs-1^{-/-}$) with growth retardation and subcutaneous adipocyte atrophy. $Irs-1^{-/-}$ mice exhibited mild insulin resistance, as demonstrated by the insulin tolerance test. Phosphatidylinositol 3-kinase (PI3K) activity and phosphorylated Protein Kinase B (PKB/AKT) expression were elevated in liver, skeletal muscle, and subcutaneous adipocytes in Irs-1 deficiency. In addition, the expression of IRS-2 and its phosphorylated version were clearly elevated in liver and skeletal muscle. With miRNA microarray analysis, we found miR-33 was down-regulated in bone marrow stromal cells (BMSCs) of $Irs-1^{-/-}$ mice, while its target gene Irs-2 was up-regulated in vitro studies. In addition, miR-33 was down-regulated in the presence of Irs-1 and which was up-regulated in fasting status. What's more, miR-33 restored its expression in re-feeding status. Meanwhile, miR-33 levels decreased and Irs-2 levels increased in liver, skeletal muscle, and subcutaneous adipocytes of $Irs-1^{-/-}$ mice. In primary cultured liver cells transfected with an miR-33 inhibitor, the expression of IRS-2, PI3K, and phosphorylated-AKT (p-AKT) increased while the opposite results were observed in the presence of an miR-33 mimic. Therefore, decreased miR-33 levels can up-regulate IRS-2 expression, which appears to compensate for the defects of the insulin signaling pathway in Irs-1 deficient mice.

• Journal of Nutrition and Health
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• 제40권8호
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• pp.675-683
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• 2007

This study was conducted to investigate the effects of feeding different carbohydrate sources and garcinia cambogia extract(HCA) on body weight and lipid metabolism. Fifty 10-month-old male Sprague-Dawley rats weighting $635{\pm}6g$ were randomly divided into 5 groups and fed different experimental diets for 4 weeks. The carbohydrate(CHO) sources of each group were cornstarch(control group, 100% of CHO), fructose(F group and FH group, 25% of CHO) and sucrose(S group and SH group, 25% of CHO). FH group and SH group were fed diets containing 1%(W/W) of HCA. Food intake, body weight gain, and calorie efficiency were not significantly different among the groups. Perirenal fat pad weight of FH group was significantly lower than F group, but epididymal fat pad weight was not different among the groups. Fasting glucose level were not significant among the groups. Plasma lipid profile of FH or SH group was slightly lower than F or S group, respectively. The degree of difference of plasma lipid level was greater between F and FH group than those of between S and SH group. In liver, total lipid, triglyceride and total cholesterol level were slightly higher in F group than S group, and tended to be lower in FH group than F group, but tended to be higher in SH group than S group. Liver citrate lyase activity were not significant among the groups. These results suggest that HCA is potential material for reduction of body weight and improvement of plasma lipid profiles. But, there was no difference between fructose intake with HCA and sucrose intake with HCA in reduction of body weight and lipid metabolism.

• Journal of Nutrition and Health
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• 제30권3호
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• pp.252-265
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• 1997

This study was performed to investigate effect of dietary fibers in rice and barley on glucose, lipid and cadmium (Cd) metabolism in the rat. Fifty-six male Spague-Dawley rats weighing 244.6$\pm$2.7g were blocked into eight groups according to body weight and raised for four weeks with diets containing 0 or 0.04%(w/w) CdCl2 and four different carbohydrate sources, starch, rice flour, barley flour and mixture of rice and barley flour(7 : 3, w/w). Total dietary fibers and $\beta$-glucan contents of barley were about three times higher than those of rice (10.75% vs. 3.94%, 3.11% vs. 1.06%, respectively). Food intake, weight gain, food efficiency ratio, liver and kidney weights were lower in Cd exposed groups, and barley group among Cd exposed animals showed highest weight gain, food efficiency ratio and organ weights. Fasting serum glucose levels were not significantly different among groups, Serum cholesterol level was lowest in Cd exposed barley group. Serum HDL-cholesterol level was higher in none-Cd exposed starch and barley groups, and HDL-cholesterol : total cholesterol ratios were higher in none-Cd rice and mixed flour groups than other groups. Liver total lipid and triglyceride levels were lowest in barley groups regardless of Cd administration. Fecal total lipid, cholesterol and triglyceride excretions were high in barley and mixed flour groups. Liver Cd concentrations were low in Cd exposed barley and mixed flour groups. In Cd exposed barley group, fecal weight and Cd excretion were highest and Cd retention ratio was lowest among groups. Small intestine metallothionein(MT) concentration was highest in Cd exposed rice group, and kidney MT concentration was highest in Cd exposed barley group. In conclusion, cereals showed different effects on lipid and Cd metabolism that might be mediated by dietary fibers in cereals. Especially $\beta$-glucan-rich barley group showed greatest lipid and Cd lowering effects by increasing fecal lipids and Cd excretions.

• Fisheries and Aquatic Sciences
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• 제23권9호
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• pp.24.1-24.9
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• 2020

Brown alga (Ishige okamurae; IO) dietary supplements have been reported to possess anti-diabetic properties. However, the effects of IO supplements have not been evaluated on glucose metabolism in the pancreas and skeletal muscle. C57BL/6 N male mice (age, 7 weeks) were arranged in five groups: a chow diet with 0.9% saline (NFD/saline group), high-fat diet (HFD) with 0.9% saline (HFD/saline group). high-fat diet with 25 mg/kg IO extract (HFD/25/IOE). high-fat diet with 50 mg/kg IO extract (HFD/50/IOE), and high-fat diet with 75 mg/kg IO extract (HFD/75/IOE). After 4 weeks, the plasma, pancreas, and skeletal muscle samples were collected for biochemical analyses. IOE significantly ameliorated glucose tolerance impairment and fasting and 2 h blood glucose level in HFD mice. IOE also stimulated the protein expressions of the glucose transporters (GLUTs) including GLUT2 and GLUT4 and those of their related transcription factors in the pancreases and skeletal muscles of HFD mice, enhanced glucose metabolism, and regulated blood glucose level. Our results suggest Ishige okamurae extract may reduce blood glucose levels by improving glucose metabolism in the pancreas and skeletal muscle in HFD-induced diabetes.

• 대한지역사회영양학회지
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• 제5권2호
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• pp.152-160
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• 2000

The purpose of this study was to investigate zinc and copper metabolism and risk factors of chronic diseases in 20 normal adults women. The daily intake, excretions in urine and feces, and serum levels of zinc and copper were determined by 24-hr food records and chemical analysis. The results were summarized as follows. mean age, body weight and BMI were 22.88 years, 54.65kg and 21.28kg/$m^2$ respectively. Mean daily intakes of energy and protein were 1578.84㎉(79% of RDA) and 52.05g (87% of RDA). The zinc and copper intake, excrestion in urine and feces were 7093.23$\mu\textrm{g}$(59% of RDA/2093.87$\mu\textrm{g}$, 203.50$\mu\textrm{g}$/39.87$\mu\textrm{g}$ and 3416.41$\mu\textrm{g}$/857.62$\mu\textrm{g}$, respectively. The serum levels of fasting glucose, insulin, total cholesterol, HDL-cholesterol, LDL-cholesterol, triglyceride, zinc and copper were 76.60mg/㎗, 15.66IU/㎗, 160.30mg/㎗, 50.95mg/㎗, 89.80mg/㎗, 89.79mg/㎗, 95.65$\mu\textrm{g}$/㎗ and 73.28$\mu\textrm{g}$/㎗ respectively. Dietary ratio of Zn to Cu was shown to have significant positive correlations with serum insulin, total cholesterol, LDL-cholesterol. The urinary ratio of Zn to Cu was shown to have significant positive correlations with triglyceride. The serum copper level was shown to have significant negative correlations with serum total cholesterol and LDL-cholesterol. In summary, Zn consumption of adult women in their normal diet does not meet the Zn requirement for Koreans. Also, intakes of Zn and Cu may effect the glucose metabolism and cardiovascular diseases. Therefore, to increase the Zn intake and to maintain an appropriate intake ratio of Zn to Cu, nutrition education needs to be implemented.

• Clinical and Experimental Reproductive Medicine
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• 제51권1호
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• pp.48-56
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• 2024

Objective: This study investigated the relationship of anthropometric and metabolic risk factors with seminal and sex steroidal hormone parameters in a screened population of healthy males. Methods: The participants were healthy young men without chronic or congenital diseases. The body composition parameters that we investigated were measured weight, height, and waist circumference (WC), as well as bioelectrical impedance analysis. Semen samples were analyzed for semen volume, sperm concentration, sperm motility and morphology, seminal pH, and liquefaction time. Biochemistry analysis, including glucose and lipid metabolism parameters, was conducted on fasting blood samples. Testicular volume was calculated separately for each testis using ultrasonography. Results: Body mass index exhibited an inverse association with total sperm count. WC showed negative correlations with numerous seminal parameters, including sperm concentration, total sperm count, sperm morphology, and follicle-stimulating hormone levels. The basal metabolic rate was associated with seminal pH, liquefaction time, and sperm motility. WC, fat mass percentage, and triglyceride levels exhibited negative correlations with sex hormone binding globulin. The measures of glucose metabolism were associated with a greater number of seminal parameters than the measures of cholesterol metabolism. C-reactive protein levels were inversely associated with sperm concentration and total sperm count. Conclusion: Anthropometric and metabolic risk factors were found to predict semen quality and alterations in sex steroidal hormone levels.

• Animal Bioscience
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• 제37권3호
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• pp.437-450
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• 2024

Objective: Vanin-1 (VNN1) is a pantetheinase that catalyses the hydrolysis of pantetheine to produce pantothenic acid and cysteamine. Our previous studies have shown that the VNN1 is specifically expressed in chicken liver which negatively regulated by microRNA-122. However, the functions of the VNN1 in lipid metabolism in chicken liver haven't been elucidated. Methods: First, we detected the VNN1 mRNA expression in 4-week chickens which were fasted 24 hours. Next, knocked out VNN1 via CRISPR/Cas9 system in the chicken Leghorn Male Hepatoma cell line. Detected the lipid deposition via oil red staining and analysis the content of triglycerides (TG), low-density lipoprotein-C (LDL-C), and high-density lipoprotein-C (HDL-C) after VNN1 knockout in Leghorn Male Hepatoma cell line. Then we captured various differentially expressed genes (DEGs) between VNN1-modified LMH cells and original LMH cells by RNA-seq. Results: Firstly, fasting-induced expression of VNN1. Meanwhile, we successfully used the CRISPR/Cas9 system to achieve targeted mutations of the VNN1 in the chicken LMH cell line. Moreover, the expression level of VNN1 mRNA in LMH-KO-VNN1 cells decreased compared with that in the wild-type LMH cells (p<0.0001). Compared with control, lipid deposition was decreased after knockout VNN1 via oil red staining, meanwhile, the contents of TG and LDL-C were significantly reduced, and the content of HDL-C was increased in LMH-KO-VNN1 cells. Transcriptome sequencing showed that there were 1,335 DEGs between LMH-KO-VNN1 cells and original LMH cells. Of these DEGs, 431 were upregulated, and 904 were downregulated. Gene ontology analyses of all DEGs showed that the lipid metabolism-related pathways, such as fatty acid biosynthesis and long-chain fatty acid biosynthesis, were enriched. KEGG pathway analyses showed that "lipid metabolism pathway", "energy metabolism", and "carbohydrate metabolism" were enriched. A total of 76 DEGs were involved in these pathways, of which 29 genes were upregulated (such as cytochrome P450 family 7 subfamily A member 1, ELOVL fatty acid elongase 2, and apolipoprotein A4) and 47 genes were downregulated (such as phosphoenolpyruvate carboxykinase 1) by VNN1 knockout in the LMH cells. Conclusion: These results suggest that VNN1 plays an important role in coordinating lipid metabolism in the chicken liver.

• Journal of Nutrition and Health
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• 제41권1호
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• pp.31-40
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• 2008

내당능 장애와 공복혈당장애는 장차 당뇨병으로 진행되거나 심혈관 질환을 일으키는 위험인자로 간주되어 적절한 혈당 및 혈중지질수치의 조절이 필요하다. 홍국의 기능성분인 모나콜린-K는 stalin계열 약물의 주원료로서 이미 지질 강하제로 잘 알려져 있다. 홍국의 지질 강하제 이외의 다른 효과로서 동물 자체 효력 시험과 문헌 고찰을 통해 혈당 강하 효과가 보고되고 있으므로 이중 맹검, 무작위배정, 위약 대조 인체시험을 통하여 홍국의 혈중 지질 및 혈당 개선에 대한 효능을 확인하는 목적으로 본 연구를 실시하였다. $18{\sim}80$세 사이의 남녀를 대상으로, 스크리닝 시 공복혈당이 110 mg/dl이상 126 mg/dl 이하인 공복 혈당 장애이거나 경구 당 부하 검사 2시간 후 혈당이 140 mg/dl 이상 199 mg/dl 이하인 내당능 장애자이거나 당화혈색소 수치가 6% 이상 7% 이하인 자로서 심각한 합병증이 없는 사람을 대상으로 하였으며, 홍국 저용량군 21명, 고용량군 23명, 위약군 20명으로 총 64명을 대상으로 12주간 검사에 대한 결과분석을 실시하였다. 1차 유효성 지표로 혈중 지질관련 지표인 중성지방, 총 콜레스테롤, LDL 콜레스테롤, HDL 콜레스테롤, Atherogenic index (AI)를 측정하였으며, 2차 유효성 지표로 혈당 지표인 공복 혈당, 경구 당부하 검사 2시간 혈당치, 당화혈색소, 인슐린, MOHAIR, 유리지방산을 측정하였다. 시험군에서 홍국제제 섭취 전후로 중성지방, 총 콜레스테롤, LDL 콜레스테롤, HDL콜레스테롤 수치가 유의적으로 개선되었으며 동맥경화지수도 유의적으로 향상되었다. 홍국 고용량군의 총 콜레스테롤, HDL 콜레스테롤과 LDL 콜레스테롤 및 동맥경화지수 개선 정도는 위약군의 변화량과 비교하여 유의적으로 개선되는 것으로 나타났고, 저용량군의 경우에도 LDL 콜레스테롤과 동맥경화지수 개선 정도가 위약군의 변화량과 비교하여 유의적으로 개선되었다. 홍국의 섭취가 혈당조절에 미치는 영향은 모든 시험군에서 제제 섭취 12주 후 공복혈당이 감소하였고, 시험군이 위약군에 비해 더욱 감소하였으나 통계적으로는 유의하지 않았다. 주평가지표인 공복혈당을 기준으로 공복혈당 110mg/dl 이상인 피험자만을 대상으로 당대사 관련 지표를 분석한 결과, 홍국 고용량군에서 공복혈당의 감소경향이 관찰되었고, 홍국 저용량군에서는 당화혈색소의 유의적인 감소효과를 확인하였으나 위약군의 변화량과 비교하여 유의적이지 않았다. 공복혈당 장애자 또는 내당능 장애자에서 하루 홍국 분말 2.52 g (저용량군) 또는 5.04 g (고용량군)을 포함한 건강기능식품을 12주간 섭취시킨 결과 혈중 지질 농도와 동맥경화 지수의 개선으로 심혈관 질환의 위험도를 낮출 수 있을 것으로 보이며, 고용량군일 경우 더 효과적일 것으로 사료된다.

• 한국식품영양과학회지
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• 제23권6호
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• pp.879-886
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• 1994

This study was carried out to determine, the effects of sodium alginate and cellulose on the plasma lipoportein composition and cholesterol metabolism inrats.Each experimental diet contained 105 sodium alginate and cellulose by weight, respectivley and rats were fed fro 4 weeks. The results obtained were as follows : The feeding of sodium alginate and cellulose decreased total plasma cholesterol slightly . total cholesterol of Chylomicron /VLDL- , LDL-fraction and liver were decreased significantly insodium alginate group. HDL-cholesterol was slightly increased in soidum alginate group. The feeding of sodium alginate significantly lowered plasma , Chylomicron VLDL-, LDL-fraction and liver TG concentrations compared with those fed fiber-free diet . The HMG-CoA reductase activity was not different among diet groups but the lowest activity was observed in sodium alginate group. The feeding of sodium alginate significantly increased fecal cholesterol , TG, and bile acid excretion . In summary , the ingestion of sodium alginate decreased cholesterol and TG concentrations of plasma and liver. This may be explained by the facts that fecal cholesterol, bile acid and TG level were increased significantly in sodium alginate group.

• Journal of Nutrition and Health
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• 제27권4호
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• pp.311-322
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• 1994

This study was conducted to compare the effects of four types of dietary fiber supplementations (cellulose, pectin, guar gum, and polydextrose) on gastrointestinal function, diabetic symptom amelioration and lipid & glucose metabolism in streptozotocin-induced diabetic rats. Six groups of male rats were fed ad libitum dietary fiber-free control diet or one of experimental diets containing 5% dietary fiber for four weeks. All types of dietary fiber supplementation seemed to protect the diabetic animals from the loss of body weight. The primary diabetic symptoms such as polydipsia, polyphasia, polyuria and urinary glucose excretion were ameliorated by cellulose, pectin, and guar gum, but not by polydextrose. Gastrointestinal transit time was significantly shortened and fecal dry weight was significantly increased in all the dietary fiber-supplemented groups except the polydextrose group. Large intestine was significantly lengthened by dietary fiber feeding. The serum triglyceride and total cholesterol levels were effectively lowered by pectin, guar gum and polydextrose. Regardless of their types, the fiber supplementation had no effect on serum HDL-cholesterol. Whereas fasting blood glucose level was significantly lowered by all types of fiber supplementations, glucose tolerance was more effectively improved by pectin and guar gum.