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Khumalo B, Siboto A, Akinnuga AM, Sibiya N, Khathi A, Ngubane PS. Momordica balsamina improves glucose handling in a diet-induced prediabetic rat model. PLoS One 2023; 18:e0295498. [PMID: 38096150 PMCID: PMC10721073 DOI: 10.1371/journal.pone.0295498] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2022] [Accepted: 11/23/2023] [Indexed: 12/17/2023] Open
Abstract
Prolonged exposure to high energy diets has been implicated in the development of pre-diabetes, a long-lasting condition that precedes type 2 diabetes mellitus (T2DM). A combination of pharmacological treatment and dietary interventions are recommended to prevent the progression of pre-diabetes to T2DM. However, poor patient compliance leads to negligence of the dietary intervention and thus reduced drug efficiency. Momordica balsamina (MB) has been reported to possess anti-diabetic effects in type 1 diabetic rats. However, the effects of this medicinal plant in conjunction with dietary intervention on pre-diabetes have not yet been established. Consequently, this study sought to evaluate the effects of MB on glucose homeostasis in a diet-induced pre-diabetes rat model in the presence and absence of dietary intervention. Pre-diabetes was induced on male Sprague Dawley rats by a high fat high carbohydrate (HFHC) diet for a period of 20 weeks. Pre-diabetic male Sprague Dawley rats were treated with MB (250 mg/kg p.o.) in both the presence and absence of dietary intervention once a day every third day for a period of 12 weeks. The administration of MB with and without dietary intervention resulted in significantly improved glucose homeostasis through reduced caloric intake, body weights, with reduced plasma ghrelin concentration and glycated hemoglobin by comparison to the pre-diabetic control. MB administration also improved insulin sensitivity as evidenced by the expression of glucose transporter 4 (GLUT 4) and glycogen synthase on the prediabetic treated animals. These results suggest that MB has the potential to be used to manage pre-diabetes and prevent the progression to overt type 2 diabetes as it demonstrated the ability to restore glucose homeostasis even in the absence of dietary and lifestyle intervention.
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Affiliation(s)
- Bongiwe Khumalo
- Department of Physiology, School of Laboratory Medicine and Medical Science, College of Health Sciences, University of KwaZulu Natal, Durban, South Africa
| | - Angezwa Siboto
- Department of Physiology, School of Laboratory Medicine and Medical Science, College of Health Sciences, University of KwaZulu Natal, Durban, South Africa
| | - Akinjide Moses Akinnuga
- Department of Physiology, School of Laboratory Medicine and Medical Science, College of Health Sciences, University of KwaZulu Natal, Durban, South Africa
- Department of Physiology, Faculty of Basic Medical Sciences, Cross River University of Technology, Okuku Campus, Cross River, Nigeria
| | - Ntethelelo Sibiya
- Pharmacology Division, Faculty of Pharmacy, Rhodes University, Grahamstown, South Africa
| | - Andile Khathi
- Department of Physiology, School of Laboratory Medicine and Medical Science, College of Health Sciences, University of KwaZulu Natal, Durban, South Africa
| | - Phikelelani Siphosethu Ngubane
- Department of Physiology, School of Laboratory Medicine and Medical Science, College of Health Sciences, University of KwaZulu Natal, Durban, South Africa
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Zhang J, Cao W, Zhao H, Guo S, Wang Q, Cheng N, Bai N. Protective Mechanism of Fagopyrum esculentum Moench. Bee Pollen EtOH Extract Against Type II Diabetes in a High-Fat Diet/Streptozocin-Induced C57BL/6J Mice. Front Nutr 2022; 9:925351. [PMID: 35845783 PMCID: PMC9280863 DOI: 10.3389/fnut.2022.925351] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Accepted: 06/10/2022] [Indexed: 12/25/2022] Open
Abstract
Bee pollen is known as a natural nutrient storehouse and plays a key role in many biological processes. Based on the preliminary separation, identification, and characterization of the main active components of Fagopyrum esculentum Moench. bee pollen (FBP), the protective effects of F. esculentum bee pollen extract (FBPE) on high-fat-diet (HFD) and streptozocin (STZ) induced type II diabetes mellitus (T2DM) was evaluated in this study. The results revealed that FBPE contains 10 active compounds mainly including luteolin (9.46 g/kg), resveratrol (5.25 g/kg), kaemferol (3.67 g/kg), etc. The animal experiment results showed that FBPE could improve HFD-STZ induced T2DM mice. Moreover, the underlying mechanism of the above results could be: (i) FBPE could reduce the inflammation related to phosphatidylinositol 3-kinase/protein kinase B (PI3K/AKT) signaling pathway, and (ii) the gut microbiota remodeling. The results of correlation analysis showed Candidatus Arthromitus and SMB53 indicated positive correlations to tumor necrosis factor-α (TNF-α); Coprococcus, Ruminocossus, and Odoribacteraceae reported negative correlations to transforming growth factor-β (TGF-β). That FBPE has an outstanding ability to improve T2DM and could be used as a kind of potential functional food for the prevention of T2DM.
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Affiliation(s)
- Jinjin Zhang
- College of Food Science and Technology, Northwest University, Xi'an, China
| | - Wei Cao
- College of Food Science and Technology, Northwest University, Xi'an, China
- Bee Product Research Center of Shaanxi, Xi'an, China
- *Correspondence: Wei Cao
| | - Haoan Zhao
- College of Food Science and Technology, Northwest University, Xi'an, China
| | - Sen Guo
- College of Food Science and Technology, Northwest University, Xi'an, China
| | - Qian Wang
- Shaanxi Institute for Food and Drug Control, Xi'an, China
| | - Ni Cheng
- College of Food Science and Technology, Northwest University, Xi'an, China
- Bee Product Research Center of Shaanxi, Xi'an, China
| | - Naisheng Bai
- College of Food Science and Technology, Northwest University, Xi'an, China
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Li ZR, Jia RB, Luo D, Lin L, Zheng Q, Zhao M. The positive effects and underlying mechanisms of Undaria pinnatifida polysaccharides on type 2 diabetes mellitus in rats. Food Funct 2021; 12:11898-11912. [PMID: 34739010 DOI: 10.1039/d1fo01838h] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The aim of the current work was to investigate the anti-diabetic effects and underlying mechanisms of Undaria pinnatifida polysaccharides (UPP) based on a type 2 diabetes (T2DM) rat model. The starch loading test showed that UPP administration could reduce blood glucose fluctuations caused by eating. Analysis of diabetic symptoms and biochemical profiles showed that UPP intervention markedly decreased fasting blood glucose level, mitigated insulin resistance, improved glucose tolerance, dyslipidemia and liver and kidney damage in diabetic rats. The 16S rRNA analysis demonstrated that UPP intervention could markedly change the intestinal microflora composition, causing increases in Alistipes, Bacteroides, Christensenellaceae_R-7_group, Desulfovibrio, Muribaculaceae_norank, Ruminococcaceae_UCG-013, and Ruminococcaceae_UCG-014, and a decrease in Escherichia-Shigella. Furthermore, RT-qPCR analysis results clarified that UPP administration distinctly activated the IRS/PI3K/AKT signaling pathway, restrained PEPCK, G-6-Pase and Egr-1 genes, and affected the relative expression of HMGCR and LDLR genes. This study demonstrates that UPP could be applied as an adjuvant agent for the management of T2DM.
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Affiliation(s)
- Zhao-Rong Li
- Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory, Chaozhou 521000, China.
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China
| | - Rui-Bo Jia
- Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory, Chaozhou 521000, China.
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China
| | - Donghui Luo
- Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory, Chaozhou 521000, China.
- College of Food Science and Technology, Guangdong Ocean University, Zhanjiang 524088, China
| | - Lianzhu Lin
- Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory, Chaozhou 521000, China.
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China
| | - Qianwen Zheng
- Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory, Chaozhou 521000, China.
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China
| | - Mouming Zhao
- Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory, Chaozhou 521000, China.
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China
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Liu Y, Dong M, Yang Z, Pan S. Anti-diabetic effect of citrus pectin in diabetic rats and potential mechanism via PI3K/Akt signaling pathway. Int J Biol Macromol 2016; 89:484-8. [DOI: 10.1016/j.ijbiomac.2016.05.015] [Citation(s) in RCA: 69] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2016] [Revised: 05/03/2016] [Accepted: 05/05/2016] [Indexed: 01/07/2023]
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McDonald MW, Murray MR, Grise KN, Olver TD, Dey A, Shoemaker JK, Noble EG, Melling CWJ. The glucoregulatory response to high-intensity aerobic exercise following training in rats with insulin-treated type 1 diabetes mellitus. Appl Physiol Nutr Metab 2016; 41:631-9. [PMID: 27175938 DOI: 10.1139/apnm-2015-0558] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
An acute bout of exercise elicits a rapid, potentially deleterious, reduction in blood glucose in patients with type 1 diabetes mellitus (T1DM). In the current study, we examined whether a 10-week aerobic training program could alleviate the rapid exercise-associated reduction in blood glucose through changes in the glucoregulatory hormonal response or increased hepatic glycogen storage in an insulin-treated rat model of T1DM. Thirty-two male Sprague-Dawley rats were divided evenly into 4 groups: non-T1DM sedentary (C) (n = 8), non-T1DM exercised (CX) (n = 8), T1DM sedentary (D) (n = 8), and T1DM exercised (DX) (n = 8). Exercise training consisted of treadmill running for 5 days/week (1 h, 27 m/min, 6% grade) for 10 weeks. T1DM was induced by multiple streptozotocin injections (20 mg/kg) followed by implantation of subcutaneous insulin pellets. At week 1, an acute exercise bout led to a significant reduction in blood glucose in DX (p < 0.05), whereas CX exhibited an increase in blood glucose (p < 0.05). During acute exercise, serum epinephrine was increased in both DX and CX (p < 0.05), whereas serum glucagon was increased during recovery only in CX (p < 0.01). Following aerobic training in DX, the exercise-mediated reduction in blood glucose remained; however, serum glucagon increased to the same extent as in CX (p < 0.05). DX exhibited significantly less hepatic glycogen (p < 0.001) despite elevations in glycogenic proteins in the liver (p < 0.05). Elevated serum epinephrine and decreased hepatic adrenergic receptor expression were also evident in DX (p < 0.05). In summary, despite aerobic training in DX, abrupt blood glucose reductions and hepatic glycogen deficiencies were evident. These data suggest that sympathetic overactivity may contribute to deficiencies in hepatic glycogen storage.
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Affiliation(s)
- Matthew W McDonald
- a School of Kinesiology, Faculty of Health Sciences, University of Western Ontario, London, ON, Canada
| | - Michael R Murray
- a School of Kinesiology, Faculty of Health Sciences, University of Western Ontario, London, ON, Canada
| | - Kenneth N Grise
- a School of Kinesiology, Faculty of Health Sciences, University of Western Ontario, London, ON, Canada
| | - T Dylan Olver
- a School of Kinesiology, Faculty of Health Sciences, University of Western Ontario, London, ON, Canada
| | - Adwitia Dey
- a School of Kinesiology, Faculty of Health Sciences, University of Western Ontario, London, ON, Canada
| | - J Kevin Shoemaker
- a School of Kinesiology, Faculty of Health Sciences, University of Western Ontario, London, ON, Canada.,b Lawson Health Research Institute, University of Western Ontario, London, ON, Canada
| | - Earl G Noble
- a School of Kinesiology, Faculty of Health Sciences, University of Western Ontario, London, ON, Canada.,b Lawson Health Research Institute, University of Western Ontario, London, ON, Canada
| | - C W James Melling
- a School of Kinesiology, Faculty of Health Sciences, University of Western Ontario, London, ON, Canada.,c School of Health Studies, Faculty of Health Sciences, University of Western Ontario, 3M Centre, Room 2213, London, ON, N6A 5B9 Canada
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Antidiabetic activities of oligosaccharides of Ophiopogonis japonicus in experimental type 2 diabetic rats. Int J Biol Macromol 2012; 51:749-55. [DOI: 10.1016/j.ijbiomac.2012.07.007] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2012] [Revised: 06/07/2012] [Accepted: 07/08/2012] [Indexed: 11/20/2022]
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Hein GJ, Chicco A, Lombardo YB. Fish oil normalizes plasma glucose levels and improves liver carbohydrate metabolism in rats fed a sucrose-rich diet. Lipids 2011; 47:141-50. [PMID: 22045300 DOI: 10.1007/s11745-011-3623-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2011] [Accepted: 10/04/2011] [Indexed: 12/23/2022]
Abstract
A sucrose-rich diet (SRD) induces insulin resistance and dyslipidemia with impaired hepatic glucose production and gluconeogenesis, accompanied by altered post-receptor insulin signaling steps. The aim of this study was to examine the effectiveness of fish oil (FO) to reverse or improve the impaired hepatic glucose metabolism once installed in rats fed 8 months a SRD. In the liver of rats fed SRD in which FO replaced corn-oil during the last 2 months, as dietary fat, several key enzyme activities and metabolites involved in glucose metabolisms (phosphorylation, glycolysis, gluconeogenesis and oxidative and non oxidative glucose pathway) were measured. The protein mass levels of IRS-1 and αp85 PI-3K at basal conditions were also analyzed. FO improved the altered activities of some enzymes involved in the glycolytic and oxidative pathways observed in the liver of SRD fed rats but was unable to restore the impaired capacity of glucose phosphorylation. Moreover, FO reversed the increase in PEPCK and G-6-Pase and reduced the G-6-Pase/GK ratio. Glycogen concentration and GSa activity returned to levels similar to those observed in the liver of the control-fed rats. Besides, FO did not modify the altered protein mass levels of IRS-1 and αp85 PI-3K. Finally, dietary FO was effective in reversing or improving the impaired activities of several key enzymes of hepatic carbohydrate metabolism contributing, at least in part, to the normalization of plasma glucose levels in the SRD-fed rats. However, these positive effects of FO were not observed under basal conditions in the early steps of insulin signaling transduction.
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Affiliation(s)
- Gustavo J Hein
- Department of Biochemistry, School of Biochemistry, University of Litoral, Ciudad Universitaria Paraje El Pozo. CC 242 (3000), Santa Fe, Argentina
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Musabayane CT, Tufts MA, Mapanga RF. Synergistic antihyperglycemic effects between plant-derived oleanolic acid and insulin in streptozotocin-induced diabetic rats. Ren Fail 2010; 32:832-9. [PMID: 20662697 DOI: 10.3109/0886022x.2010.494802] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Studies from our laboratories indicate that Syzygium cordatum leaf extract contains triterpene mixtures [oleanolic acid (OA) and ursolic acid (UA)] with hypoglycemic properties. The aims of this study were to investigate the hypoglycemic effects of Syzygium aromaticum-derived OA and whether OA influenced the blood glucose lowering effects of insulin in streptozotocin (STZ)-induced diabetic rats. We envisaged that OA may provide a strategy with different mechanism of action for effective diabetic therapy because no single-marketed antidiabetic drug is capable of achieving long-lasting blood glucose control. The effects of various doses of OA and/or standard antidiabetic drugs on blood glucose were monitored in nondiabetic and STZ-induced diabetic rats given a glucose load after an 18-h fast. Rats treated with deionized water and standard antidiabetic drugs acted as untreated and treated positive controls, respectively. Blood glucose concentrations were measured at 15-min intervals for the first hour and hourly thereafter for 3 h. Blood glucose concentrations were also monitored in animals treated with OA and/or standard antidiabetic drugs for 5 weeks. OA like insulin decreased blood glucose concentrations in nondiabetic and STZ-induced diabetic rats. Combined OA and insulin treatment had even greater antihyperglycemic response, suggestive of a synergistic effect of the two. After 5 weeks, STZ-induced diabetic rats exhibited hyperglycemia and depleted hepatic and muscle glycogen concentrations. OA treatment lowered the blood glucose with concomitant restoration of glycogen concentrations to near normalcy. Our results suggest that OA may have a role in improving insulin sensitivity. These findings merit further research in this field.
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Affiliation(s)
- C T Musabayane
- Discipline of Human Physiology, School of Medical Sciences, University of KwaZulu-Natal, Durban, South Africa.
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Gnainsky Y, Spira G, Paizi M, Bruck R, Nagler A, Genina O, Taub R, Halevy O, Pines M. Involvement of the tyrosine phosphatase early gene of liver regeneration (PRL-1) in cell cycle and in liver regeneration and fibrosis effect of halofuginone. Cell Tissue Res 2006; 324:385-94. [PMID: 16508789 DOI: 10.1007/s00441-005-0092-1] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2005] [Accepted: 09/14/2005] [Indexed: 12/21/2022]
Abstract
Tyrosine phosphatase PRL-1 is one of the immediate-early genes up-regulated during liver regeneration and is apparently involved in cell proliferation. Previously, we have demonstrated that halofuginone, an inhibitor of collagen type I synthesis, prevents liver fibrosis and improves cirrhotic liver regeneration. In this study, we evaluated the effect of halofuginone on PRL-1 expression, its cellular localization in vitro and during liver regeneration, and fibrosis progression in vivo. In culture, halofuginone increased PRL-1 expression in primary rat hepatocytes and in hepatocellular carcinoma (HCC) cell lines, the former being more sensitive to halofuginone. The halofuginone-dependent increase in PRL-1 gene expression was correlated with an increase in the transcription factor early growth response-1 (Egr-1) and inversely correlated with the inhibition of cell proliferation. Halofuginone arrested HepG2 and Huh7 cell lines at the G1 phase, whereas Hep3B cells were arrested at G2/M, probably because of a reduction in the synthesis of cyclins D1 and B1 in all HCC cells and increased cyclin A in Hep3B cells. Halofuginone also affected the PRL-1 sub-cellular localization that was cell-cycle-dependent. In addition, halofuginone augmented PRL-1 expression in the remnant liver after partial hepatectomy and in chemically induced fibrosis in rats; this was accompanied by increased expression of insulin-like growth factor binding protein 1 (IGFBP-1), another immediate-early gene of regeneration. The regulation of the expression of the early genes of regeneration such as PRL-1 and IGFBP-1 is thus part of the mode of action of halofuginone and results in the prevention of liver fibrosis and improved cirrhotic liver regeneration.
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Affiliation(s)
- Yulia Gnainsky
- Institute of Animal sciences , Volcani Center , P.O. Box 6 , 50250 Bet Dagan , Israel
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Nicolau J, de Matos JA, de Souza DN, Neves LB, Lopes AC. Altered glycogen metabolism in the submandibular and parotid salivary glands of rats with streptozotocin-induced diabetes. J Oral Sci 2005; 47:111-6. [PMID: 16050492 DOI: 10.2334/josnusd.47.111] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
Experimental animal models of diabetes induced either by alloxan or streptozotocin have been used to study aspects of the pathophysiology of this disease. The purpose of this study was to examine the metabolism of glycogen in the submandibular and parotid salivary glands of diabetic rats. Diabetes was induced by an intraperitoneal injection of streptozotocin. Eight weeks after the induction of diabetes, the animals were sacrificed and the submandibular and parotid salivary glands were removed. The glands were analyzed for glycogen concentration, and activities of glycogen synthase and phosphorylase. Although the diabetic rats consumed more food than controls, they had a lower body weight eight weeks after diabetes induction. Glycogen concentration in the submandibular and parotid glands increased by about 27% and 130%, respectively. Glycogen phosphorylase a in the submandibular gland of diabetic rats showed a reduction of between 75% and 68% compared with controls. In parotid glands, phosphorylase a was reduced by between 84% and 79% compared with controls. The increase in the activity of glycogen synthase a (active) varied from 64% to 130% for the submandibular glands and from 75% to 110% for the parotid compared with controls. These results suggest that the diabetic state influences glycogen metabolism in the submandibular and parotid salivary glands of rats.
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Affiliation(s)
- José Nicolau
- Oral Biology Research Center, Faculty of Dentistry, University of São Paulo, São Paulo, Brazil.
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Gnainsky Y, Spira G, Paizi M, Bruck R, Nagler A, Abu-Amara SN, Geiger B, Genina O, Monsonego-Ornan E, Pines M. Halofuginone, an inhibitor of collagen synthesis by rat stellate cells, stimulates insulin-like growth factor binding protein-1 synthesis by hepatocytes. J Hepatol 2004; 40:269-77. [PMID: 14739098 DOI: 10.1016/j.jhep.2003.10.020] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
BACKGROUND/AIMS Halofuginone, an inhibitor of collagen synthesis, prevented and caused resolution of established hepatic fibrosis. A genomic approach in vivo was used to search for additional genes responsible for halofuginone mode of action. METHODS Fibrosis was induced in rats by thioacetamide (TAA) and evaluated by collagen type I gene expression and the levels of collagen, tissue inhibitors of metalloproteinases-2 and smooth-muscle actin. Halofuginone was given in the diet. cDNA from liver biopsies was hybridized on Atlas arrays comprising of 588 genes. The results were confirmed by Northern blots and in situ hybridization. RESULTS Insulin-like growth factor binding protein-1 (IGFBP-1) was one of the 13 genes differentially expressed in the fibrotic liver after halofuginone treatment. After 2 and 4 weeks, halofuginone prevented the TAA-induced down-regulation of IGFBP-1 gene expression. Halofuginone also prevented the TAA-dependent changes in IGFBP-3 gene expression. Halofuginone affected IGFBP-1 synthesis in rat hepatocytes and cells of hepatocyte origin and caused time- and dose-dependent increases in the IGFBP-1 gene expression and synthesis by HepG2 cells. The IGFBP-1 secreted by HepG2-inhibited stellate cell motility. CONCLUSIONS Halofuginone is an anti-fibrotic drug that inhibits collagen synthesis by stellate cells and preventing alteration in the synthesis of IGFBPs by hepatic cells.
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Affiliation(s)
- Yulia Gnainsky
- Institute of Animal Sciences, Agricultural Research Organization, the Volcani Center, PO Box 6, Bet Dagan 50250, Israel
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Popov D, Simionescu M, Shepherd PR. Saturated-fat diet induces moderate diabetes and severe glomerulosclerosis in hamsters. Diabetologia 2003; 46:1408-18. [PMID: 12898005 DOI: 10.1007/s00125-003-1185-6] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/11/2003] [Revised: 06/02/2003] [Indexed: 10/26/2022]
Abstract
AIMS/HYPOTHESIS Diets high in saturated fat are thought to be a risk factor for Type 2 diabetes and associated complications. We investigated effects of a medium and high saturated fat diet on the development of diabetes-associated pathologies in Golden Syrian hamsters, an animal that reacts to dietary lipids in a fashion similar to humans. METHODS Three diets containing 46.5 kcal %, 267.3 kcal %, and 488.2 kcal % as saturated fat respectively, were studied. Metabolic parameters were measured up to 20 weeks. Electron microscopy was used to examine the structure of the pancreas, aorta and kidney. RESULTS Increased saturated fat consumption was associated with: (i) gradual imbalance of homeostasis, and severe structural alterations of acinar, beta cells and capillaries in the pancreas, and of the kidney glomeruli; (ii) severe hypertriglyceridaemia and augmented creatinine concentrations related to disturbances of the renal function, progressing to nodular glomerulosclerosis and nephropathy; (iii) reduced early insulin secretion in response to glucose; (iv) switch of the aortic endothelium to a secretory phenotype. CONCLUSION/INTERPRETATION The results show that high-caloric saturated fat intake induced diabetes in hamsters, probably linked to delayed insulin secretion. The model was also associated with the development of a range of pathologies characteristic to human diabetes, including nephropathy and defects in vasculature. Thus, high-fat fed hamsters provide a new model that is likely to be useful in understanding the cellular and molecular mechanisms involved in the pathogenesis of diabetes.
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Affiliation(s)
- D Popov
- Institute of Cellular Biology and Pathology N.Simionescu, 8, BP Hasdeu Street, 79691, Bucharest, Romania.
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