Search results

1

Liver mitochondria and insulin resistance

100%

Vial G., Dubouchaud H., Leverve X. M.

Acta Biochimica Polonica

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2010

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vol. 57

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issue 4

389-392

EN

With a steadily increasing prevalence, insulin resistance (IR) is a major public health issue. This syndrome is defined as a set of metabolic dysfunctions associated with, or contributing to, a range of serious health problems. These disorders include type 2 diabetes, metabolic syndrome, obesity, and non-alcoholic steatohepatitis (NASH). According to the literature in the field, several cell types like β-cell, myocyte, hepatocyte and/or adipocyte, as well as related complex signaling environment involved in peripheral insulin sensitivity are believed to be central in this pathology. Because of the central role of the liver in the whole-body energy homeostasis, liver insulin sensitivity and its potential relationship with mitochondrial oxidative phosphorylation appear to be crucial. The following short review highlights how liver mitochondria could be implicated in IR and should therefore be considered as a specific therapeutic target in the future.

2

Randomized Clinical Trial to Compare the Effects of Preoperative Oral Carbohydrate Loading versus Placebo on Insulin Resistance and Cortisol Level after Laparoscopic Cholecystectomy

100%

Pędziwiatr M., Pisarska M., Matłok M., Major P., Kisielewski M., Wierdak M., Natkaniec M., Budzyński P., Rubinkiewicz M., Budzyński A.

Polish Journal of Surgery

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2015

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vol. 87(8)

402-408

EN

Postoperative insulin resistance, used as a marker of stress response, is clearly an adverse event. It may induce postoperative hyperglycemia, which according to some authors can increase the risk of postoperative complications. One of the elements of modern perioperative care is preoperative administration of oral carbohydrate loading (CHO-loading), which shortens preoperative fasting and reduces insulin resistance. The aim of the study is to establish the influence of CHO-loading on the level of insulin resistance and cortisol in patients undergoing elective laparoscopic cholecystectomy. Material and methods. Patients were randomly allocated to one of 2 groups. The intervention group included 20 patients who received CHO-loading (400 ml Nutricia pre-op®) 2 hours prior surgery. The control group received a placebo (clear water). In every patient blood samples were taken 2 hours prior to surgery, immediately after surgery, and on the 1st postoperative day. Levels and changes in glucose, cortisol and insulin resistance were analyzed in both groups. Results. Although there were differences in the levels of cortisol, insulin, and insulin resistance, no statistically significant differences were observed between groups in every measurement. The length of stay and postoperative complications were comparable in both groups. Conclusions. We believe that CHO-loading is not clinically justified in case of laparoscopic cholecystectomy. No effect on the levels of glucose, insulin resistance and cortisol was observed. Even though such procedure is safe, in our opinion there is no clinical benefit from CHO-loading prior to laparoscopic cholecystectomy.

3

AS-30D hepatoma as a model to study on insulin resistance in vitro

100%

Wierzbicka-Bregier K., Brutkowski W., Borkowska A., Milewski K., Zabłocki K.

Acta Biochimica Polonica

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2013

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vol. 60

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issue 4

635-640

EN

Studies on insulin resistance of liver cells are often performed with the use of various hepatoma cell lines. Such an approach allows investigating selected biochemical pathways at the cellular level. However, possible modifications of metabolic processes due to the neoplastic nature of such cells must be considered. Expanding the diversity of hepatoma cell lines used in metabolic studies could deliver new data for comparison with those obtained for other cell lines and should reduce the risk of misleading conclusions. In this study rat hepatoma AS-30D cells were tested as a potential model for studies on palmitate-induced insulin resistance. It was found that insulin-induced Akt kinase phosphorylation was substantially reduced in cells incubated with palmitate at a concentration as low as 75 µM. This effect was not accompanied by excessive reactive oxygen species (ROS) generation or increased Jun N-terminal kinase (JNK) phosphorylation. Moreover, preincubation of AS-30D cells with rosiglitazone, an antidiabetic agonist of peroxisome proliferator-activated receptor gamma (PPARγ), efficiently prevented the palmitate-induced insulin resistance. We conclude that AS-30D hepatoma cells may be used as a model sensitive to insulin and vulnerable to palmitate-induced insulin resistance.

4

Hepatocyte nuclear factor 4 alpha P2 promoter variants associate with insulin resistance

100%

Saif-Ali R., Harun R., Al-Jassabi S., Wan Ngah W.

Acta Biochimica Polonica

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2011

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vol. 58

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issue 2

179-186

EN

This study aimed to investigate the associations of hepatocyte nuclear factor 4 (HNF4) alpha single nucleotide polymorphisms (SNPs) and haplotype with insulin resistance and metabolic syndrome parameters. Nine SNPs spanning the HNF4 alpha P2 promoter (rs4810424, rs1884613 and rs1884614) and coding region (rs2144908, rs6031551, rs6031552, rs1885088, rs1028583 and rs3818247) were genotyped in 160 subjects without diabetes or metabolic syndrome. The HNF4 alpha P2 promoter SNPs rs4810424, rs1884613 and rs1884614 were associated with insulin resistance (p = 0.017; 0.037; 0.024) and body mass index (BMI) (p = 0.03; 0.035; 0.039). The intron 1D SNP rs2144908 was associated with high-density lipoprotein cholesterol (HDLc) (p = 0.020) and the intron 9 SNP rs3818247 showed association with systolic (p = 0.02) and diastolic (p = 0.034) blood pressure. HNF4 alpha common haplotype CCCGTC associated with higher insulin resistance (p = 0.022), fasting blood glucose (FBG) (p = 0.035) and lower HDLc (p = 0.001). In conclusion, subjects with HNF4 alpha P2 variants and haplotypes have been shown to have a higher insulin resistance and are therefore at a higher risk for developing type 2 diabetes mellitus.

5

Insulin resistance and adipokine levels correlate with early atherosclerosis – a study in prediabetic patients

88%

Mihai B. M., Petriș A. O., Ungureanu D. A., Lăcătușu C. M.

Open Medicine

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2014

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vol. 10

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issue 1

EN

Cardiovascular risk of prediabetes is still subject to controversies. We analyzed the associations between insulin resistance, adipokines and incipient atherosclerosis estimated by intima-media thickness (IMT) in a cross-sectional study on 122 prediabetic subjects without clinical signs of atherosclerotic disease. Homeostasis model assessment of insulin resistance (HOMA-IR, calculated as fasting insulin × fasting plasma glucose / 22.5), adiponectin, leptin, leptin-to-adiponectin ratio, carotid and femoral IMT were evaluated. We also assessed other parameters related to insulin resistance and adipokines (HbA1c, anthropometric and lipid parameters), as they may also influence atherosclerosis. Carotid IMT was correlated to adiponectin and leptin-to-adiponectin ratio (all p < 0.05), but not with HOMA-IR or leptin, while femoral IMT showed no relationship with these factors. After adjusting for leptin, leptin-to-adiponectin ratio, triglycerides, HDL-cholesterol, cholesterol-to-HDL ratio, triglycerides-to-HDL ratio and HbA1c, IMT values became correlated with HOMA-IR. Adjustment for HOMA-IR induced the appearance of new correlations between adipokines and both IMT values. In conclusion, insulin resistance and adipokines seem related to IMT in prediabetic subjects without clinical signs of arterial obstruction.

6

Combined effects of caffeine and aerobic exercise on leptin levels and some indices of insulin resistance in diabetics

88%

Amaghani A., Jamali Gharakhanlou B., Zarghami Khamneh A., Radkhah N.

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vol. 44

15-26

EN

The study aimed to examine the combined effects of caffeine and aerobic exercise on leptin levels and some indices of insulin resistance in diabetics Thirty-two males with type 2 diabetes participated in a quasi-experimental and double-blind design. All participants were divided into four homogeneous groups of 8 individuals, including placebo (P), caffeine supplementation (C), aerobic training (AT), and aerobic training and caffeine (AT + C). The design protocol included eight weeks of aerobic exercise and caffeine consumption. Blood samples were taken to measure serum levels of leptin, glucose, insulin, HbA1c, HOMA-IR, and insulin sensitivity (QUICKI) indices at two phases. Data were analyzed by repeated measure ANOVA, Bonferroni posthoc, and independent T-test at a significant level of a ≤ 0.05. The results showed that the levels of leptin, glucose, insulin, HbA1c, and HOMA-IR in the three intervention groups significantly decreased compared to the placebo group (P = 0.001). In addition, QUICKI was significantly increased in the three groups of caffeine (C), aerobic training (AT), and aerobic training + caffeine (AT + C) compared to the placebo group (P = 0.001). Also, the AT+C group has double effects on the investigated indices compared to the caffeine (C) group (P = 0.001). Regular aerobic exercise and caffeine supplementation may be more effective treatments for improving insulin resistance indicators associated with type 2 diabetes.

7

Role of pro-inflammatory cytokines of pancreatic islets and prospects of elaboration of new methods for the diabetes treatment

88%

Cieślak M., Wojtczak A., Cieślak M.

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EN

Several relations between cytokines and pathogenesis of diabetes are reviewed. In type 1 and type 2 diabetes an increased synthesis is observed and as well as the release of pro-inflammatory cytokines, which cause the damage of pancreatic islet cells and, in type 2 diabetes, the development of the insulin resistance. That process results in the disturbed balance between pro-inflammatory and protective cytokines. Pro-inflammatory cytokines such as interleukin 1β (IL-1β), tumor necrosis factor-α (TNF-α) and interferon-γ (IFN-γ), as well as recently discovered pancreatic derived factor PANDER are involved in the apoptosis of pancreatic β-cells. Inside β-cells, cytokines activate different metabolic pathways leading to the cell death. IL-1β activates the mitogen-activated protein kinases (MAPK), affects the nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB) and activates the inducible nitric oxide synthase (iNOS). TNF-α and IFN-γ in a synergic way activate calcium channels, what leads to the mitochondrial dysfunction and activation of caspases. Neutralization of pro-inflammatory cytokines, especially interleukin 1β with the IL-1 receptor antagonist (IL-1Ra) and/or IL-1β antibodies might cause the extinction of the inflammatory process of pancreatic islets, and consequently normalize concentration of glucose in blood and decrease the insulin resistance. In type 1 diabetes interleukin-6 participates in regulation of balance between Th17 and regulatory T cells. In type 2 diabetes and obesity, the long-duration increase of IL-6 concentration in blood above 5 pg/ml leads to the chronic and permanent increase in expression of SOCS3, contributing to the increase in the insulin resistance in cells of the skeletal muscles, liver and adipose tissue.

8

Raised plasma insulin level and homeostasis model assessment (HOMA) score in cerebral malaria: evidence for insulin resistance and marker of virulence

88%

Eltahir E. M., ElGhazali G., A-Elgadir T. M. E., A-Elbasit I. E., Elbashir M. I., Giha H. A.

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EN

Objective: To study the glycaemic profile of patients with severe malaria (SM). Methods: For this purpose, 110 SM patients were recruited. Pre-treatment random blood glucose and plasma insulin were measured in a subset of donors. An ex-vivo experiment was developed for estimation of glucose consumption by parasitized erythrocytes. Results: Hyperglycaemia was frequent in SM but more commonly associated with cerebral malaria (CM), while hyperinsulinaemia was recognized in severe-malarial-hypotension (median, 25 %-75 %, 188.2, 93.8-336.8 pmol/L). The plasma insulin level was positively correlated with age (CC = 0.457, p < 0.001) and negatively with parasitaemia (CC = -0.368, p = 0.045). Importantly, fatal-CM was associated with hyperglycaemia (12.22, 6.5-14.6 mmol/L), hyperinsulinaemia (141.0, 54.0-186.8 pmol/L) and elevated homeostasis model assessment (HOMA) values. However, there was a trend of higher glucose consumption by parasites in CM compared with that in uncomplicated malaria (UM). Conclusion: Hyperglycaemia, hyperinsulinaemia and elevated HOMA are evidence for insulin resistance and possibly pancreatic B-cell dysfunction in fatal-CM.

9

Serum concentration of visfatin is decreased in patients with chronic heart failure

88%

Straburzyńska-Migaj E., Pilaczyńska-Szcześniak Ł., Nowak A., Straburzyńska-Lupa A., Śliwicka E., Grajek S.

Acta Biochimica Polonica

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2012

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vol. 59

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issue 3

339-343

EN

Background. There is an increasing interest in the role of adipocytokines in cardiovascular pathophysiology. Aim. The aim of the study was to compare visfatin levels, a novel adipokine, in patients with heart failure (HF) due to the left ventricular systolic dysfunction with those in age- and body mass index (BMI) - matched healthy controls in relation to the parameters of glucose metabolism and high sensitivity C-reactive protein (hsCRP) levels. Material/Subjects and Methods. The study population consisted of 28 males with systolic HF referred for cardiopulmonary exercise testing, divided into two subgroups based on their NYHA class (HF patients NYHAI+II, n=17, and HF patients NYHAIII+IV, n=11), and 23 controls. The following indices were measured in a serum samples: visfatin, hsCRP, glucose and lipid metabolism parameters, and the insulin resistance index HOMAIR (homeostasis model assessment insulin resistance) was calculated. Results. Concentrations of visfatin and high-density lipoprotein cholesterol (HDL-cholesterol) in the HF subjects were significantly lower (p≤0.01) than in controls. The Kruskal-Wallis test showed significant differences between three groups (controls and both subgroups of heart failure patients) in mean levels of visfatin, hsCRP, glucose, HOMAIR and HDL-cholesterol. Conclusion. Serum visfatin concentrations in patients with systolic HF, particularly with more advanced NYHA classes, are significantly lower in comparison to healthy controls and are independent of age or anthropometric and metabolic parameters.

10

Polimorfizm genu syntetazy acylo-CoA typu 5 (ACSL5) a występowanie nieprawidłowej masy ciała w korelacji do obwodupasa wraz ze wskaźnikiem insulinooporności wśród populacji zamieszkującej region Polski Południowej

75%

Zdebska M., Szywacz W., Matuszny G., Abouda A., Szweda N., Gola M., Śnit M., Grzeszczak W.

Annales Academiae Medicae Silesiensis

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2018

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issue 72

121-127

EN

INTRODUCTION: Lipid metabolism disorders and the obesity connected with them are problems which occur increasingly more frequently in highly-developed countries. Acyl-CoA synthetase (ACSL) is an important enzyme in lipid metabolism taking part in the activation of fatty acids (FA). This makes determining the correlation between the gene polymorphism for ACSL and the development of obesity a relevant research issue. AIMS: The aim of this study was to examine the dependence of the Acyl-CoA synthetase gene polymorphism on the occurrence of inappropriate body weight and HOMA-IR indicator values. MATERIAL AND METHODS: A total of 506 patients were examined, whose ACSL5 rs2419621 polymorphism was determined using probes binding with a specific DNA matrix. RESULTS: The results of the Hardy-Weinberg equilibrium test showed that the genotype proportions within the population are maintained. Among the patients from the research sample, 177 patients with a proper body weight were identified along with 330 patients with inappropriate Body Mass Index (BMI) values. CONCLUSIONS: It was determined that there are no differences between the statistical variables in the distribution of acyl-CoA of isoform 5 synthetase gene polymorphism genotypes. Based on the results of the study, a correlation between the gene polymorphism for ACSL5 and the development of obesity cannot be determined.

PL

WSTĘP: Zaburzenia przemian lipidów i związana z nimi otyłość to problem coraz częściej dotykający ludzi w krajach wysoko rozwiniętych. Syntetaza acylo-CoA typu 5 (ACSL5) jest ważnym enzymem metabolizmu lipidów, biorącym udział w aktywacji kwasów tłuszczowych. Prawidłowe funkcjonowanie tego enzymu zapewnia substraty zarówno dla lipogenezy, jak i oksydacji kwasów tłuszczowych, stąd określenie związku między polimorfizmem genu dla ACSL a kształtowaniem otyłości stanowi istotny problem badawczy. CEL PRACY: Celem pracy było wykazanie zależności między nieprawidłową masą ciała oraz wartością wskaźnika HOMA-IR (homeostasis model assessment) a występowaniem polimorfizmu genu syntetazy acylo-CoA izoformy 5. MATERIAŁ I METODY: Przebadano łącznie 506 pacjentów, u których za pomocą sond specyficznie wiążących się z DNA matrycy oznaczono polimorfizm ACSL5 rs2419621. WYNIKI: Za pomocą testu statystycznego Hardy’ego-Weinberga wykazano, że proporcje genotypów w populacji są zachowane. Wśród pacjentów stanowiących próbę badawczą wyróżniono 177 osób o prawidłowej masie ciała oraz 330 osób z nieprawidłową wartością indeksu BMI. WNIOSKI: Wykazano brak zmiennych różnic statystycznych w rozkładzie genotypów polimorfizmu genu syntetazy acylo-CoA izoformy 5. Wyniki przeprowadzonego badania nie pozwalają wykazać zależności między polimorfizmem genu dla ACSL5 a kształtowaniem otyłości.

11

QUERCETIN AMELIORATES INSULIN RESISTANCE CONCOMITANT EARLY CARDIOVASCULAR CHANGES IN EXPERIMENTAL RATS

75%

KUSHWAH A. S., GUPTA G. D.

Acta Poloniae Pharmaceutica - Drug Research

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2018

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vol. 75

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issue 4

977-987

EN

Quercetin is a dietary flavonoid found in a wide range of fruits and vegetables; it has diverse biological activities, possesses beneficial effects in ameliorating diabetic complications, apart from the effect of quercetin on fructose feed induced insulin resistance (IR) linked cardiac dysfunction have not been entirely revealed. This study aspires to explore the effect of quercetin on metabolism, oxidative stress, cardiomyocytes damage and cardiac function in IR state. Wistar rats either sex weighing 220-250 g (n ꞊8), were divided into four groups, kept on either control diet and high fructose diet and supplement with a quercetin as a test drug and metformin as a standard, at the dose of 50 and 200 mg/ kg; p.o., respectively. Daily measured body weight, feed, and water intake for 35 days, Oral glucose tolerance test (OGTT) performed in animals on the 32nd day. At end of the study (36th day), measured hemodynamic parameters after that estimation of various biochemical parameters. Finally, the animals were sacrificed for isolation of tissues and measured heart weight, the oxidative stress level of heart and histopathological changes. Treatment of quercetin with fructose-fed ameliorated all the parameters revile by the contrast of IR rats. The outcome of quercetin associated improves insulin sensitivity, normalized lipid profile, abolish hemodynamic changes, oxidative stress and cardiac injury markers within fructose-fed, and lesser histopathological changes were observed contrast with IR rats. These beneficial effects of quercetin mediated by improving insulin sensitivity and metabolism; reduced oxidative stress could potentially be used to ameliorate the myocardial damage.

12

Rodzinna ogniskowa lipodystrofia

63%

Madej-Pilarczyk A.

Aktualności Neurologiczne

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2006

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vol. 6

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issue 1

32-34

EN

Familial partial lipodystrophy (Dunnigan type) belongs to group of laminopathies. The main features of the disease include loss of subcutaneous adipose tissue from limbs and trunk, sparring the face and neck, associated with insulin resistant diabetes mellitus and dyslipidemia. Metabolic syndrome is responsible for atherosclerosis which predisposes to coronary heart disease in young people. Hormonal disorders, i.e. polycystic ovarian syndrome and acromegaloid features are found in some patients. Laboratory tests reveal insulin resistance, hyperinsulinemia, hyperglycemia, hypertriglyceridemia and low HDL-cholesterol. Mean FFA level is higher and leptin and adiponectin levels are lower in patients with lipodystrophy type Dunnigan in comparison to healthy people. Women predominance and intrafamilial variability are observed. The disease is characterized by autosomal dominant inheritance. The most frequent mutation is R482W in exon 8, but mutations in exon 11, affecting only lamin A, are also known. Treatment of dyslipidemia and diabetes (diet and pharmacotherapy) are main purposes of therapy.

PL

Rodzinna ogniskowa lipodystrofia (typu Dunnigana) jest jedną z postaci laminopatii. Charakteryzuje się utratą podskórnej tkanki tłuszczowej na kończynach i tułowiu, z przesunięciem jej na twarz i szyję oraz zaburzeniami metabolicznymi w postaci insulinoopornej cukrzycy i dyslipidemii. Zespół metaboliczny sprzyja rozwojowi miażdżycy, co predysponuje do ujawnienia się choroby wieńcowej w młodym wieku. U niektórych chorych obserwuje się zaburzenia endokrynologiczne pod postacią wielotorbielowatości jajników i cech akromegaloidalnych. W badaniach laboratoryjnych stwierdza się oporność na insulinę, hiperinsulinemię, hiperglikemię, hipertriglicerydemię oraz niskie stężenie cholesterolu HDL. Średnie stężenie wolnych kwasów tłuszczowych jest u chorych na lipodystrofię typu Dunnigana wyższe, zaś stężenie leptyny i adiponektyny niższe niż u osób zdrowych. Na lipodystrofię typu Dunnigana częściej chorują kobiety. Choroba dziedziczy się w sposób autosomalny dominujący. Najczęściej obserwowaną mutacją jest R482W w eksonie 8. genu LMNA, niemniej znane są także mutacje zlokalizowane w eksonie 11., dotyczące wyłącznie laminy A. Obserwuje się dużą wewnątrzrodzinną zmienność fenotypową. Najważniejszym celem w leczeniu lipodystrofii jest terapia zaburzeń lipidowych oraz cukrzycy (dietetyczna i farmakologiczna).

Refine search results

Liver mitochondria and insulin resistance

Randomized Clinical Trial to Compare the Effects of Preoperative Oral Carbohydrate Loading versus Placebo on Insulin Resistance and Cortisol Level after Laparoscopic Cholecystectomy

AS-30D hepatoma as a model to study on insulin resistance in vitro

Hepatocyte nuclear factor 4 alpha P2 promoter variants associate with insulin resistance

Insulin resistance and adipokine levels correlate with early atherosclerosis – a study in prediabetic patients

Combined effects of caffeine and aerobic exercise on leptin levels and some indices of insulin resistance in diabetics

Role of pro-inflammatory cytokines of pancreatic islets and prospects of elaboration of new methods for the diabetes treatment

Raised plasma insulin level and homeostasis model assessment (HOMA) score in cerebral malaria: evidence for insulin resistance and marker of virulence

Serum concentration of visfatin is decreased in patients with chronic heart failure

Polimorfizm genu syntetazy acylo-CoA typu 5 (ACSL5) a występowanie nieprawidłowej masy ciała w korelacji do obwodupasa wraz ze wskaźnikiem insulinooporności wśród populacji zamieszkującej region Polski Południowej

QUERCETIN AMELIORATES INSULIN RESISTANCE CONCOMITANT EARLY CARDIOVASCULAR CHANGES IN EXPERIMENTAL RATS

Rodzinna ogniskowa lipodystrofia