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Aguiar A, Giaquinto PC. Low cholesterol is not always good: low cholesterol levels are associated with decreased serotonin and increased aggression in fish. Biol Open 2018; 7:bio.030981. [PMID: 30530746 PMCID: PMC6310874 DOI: 10.1242/bio.030981] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The inverse relationship between serum cholesterol and levels of aggression led to the cholesterol-serotonin hypothesis. According to this hypothesis, low dietary cholesterol intake leads to depressed central serotonergic activity, which is associated with increased aggression. Here we present the hypothesis about the evolutionary origins of low cholesterol and aggressive behavior, investigating the relationship between low levels of plasma cholesterol and aggressive behavior in fish. We used Nile tilapia (Oreochromis niloticus), a species of aggressive fish with a clear dominant subordinate relation, as an experimental model. The fish were treated with statin, a cholesterol-lowering drug. Aggressive behavior, brain serotonin (5-HT) concentrations, 5-hydroxyindoleacetic acid (5-HIAA, the major 5-HT metabolite) and plasma cholesterol were analyzed after chronic administration of statin. Our results show that fish treated with statin exhibited reduced plasma cholesterol, reduced telencephalic indexes of 5-HIAA/5-HT and increased aggressive behavior compared to control fish. These results indicate that changes in plasma cholesterol may affect neurochemical processes underlying aggressive behavior in fish, suggesting an evolutionary mechanism conserved among vertebrates. Such mechanisms may be important for the control of aggression in many vertebrate species, not just mammals, as has been demonstrated so far. Summary: Fish treated with statin exhibited reduced plasma cholesterol, reduced telencephalic indexes of 5-HIAA/5-HT and increased aggressive behavior compared with control fish. Such mechanisms may be important for the control of aggression in many vertebrate species.
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Affiliation(s)
- Ariane Aguiar
- Physiology Department, Biosciences Institute, Sao Paulo State University, Sao Paulo 18618-689, Brazil
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Lucero D, Miksztowicz V, Gualano G, Longo C, Landeira G, Álvarez E, Zago V, Brites F, Berg G, Fassio E, Schreier L. Nonalcoholic fatty liver disease associated with metabolic syndrome: Influence of liver fibrosis stages on characteristics of very low-density lipoproteins. Clin Chim Acta 2017; 473:1-8. [PMID: 28802640 DOI: 10.1016/j.cca.2017.08.006] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Revised: 08/07/2017] [Accepted: 08/08/2017] [Indexed: 02/07/2023]
Abstract
BACKGROUND We evaluated possible changes in VLDLcharacteristics, and metabolic related factors, in MetS-associated NAFLD and accompanying liver fibrosis. METHODS We studied 36 MetS patients with biopsy-proven NAFLD (MetS+NAFLD) and 24 MetS without ultrasound NAFLD evidence. Further, MetS+NAFLD was sub-divided according to fibrosis stage into, non-to-moderate (F0-F2, n=27) and severe (F3-F4, n=9) fibrosis. We measured: lipid profile, VLDL composition and size (size exclusion-HPLC), CETP and lipoprotein lipase (LPL) activities and adiponectin. Additionally, in MetS+NAFLD type IV collagen 7S domain was measured. RESULTS MetS+NAFLD showed increased VLDL-mass, VLDL particle number, VLDL-triglyceride% and large VLDL-% (p<0.04). CETP activity tended to increase in MetS+NAFLD (p=0.058), while LPL activity was unchanged. Moreover, in MetS+NAFLD, adiponectin was decreased (p<0.001), and negatively correlated with VLDL-mass and VLDL particle number (p<0.05), independently of insulin-resistance. Within MetS+NAFLD group, despite greater insulin-resistance, patients with severe fibrosis showed lower plasma triglycerides, VLDL-mass, VLDL-triglyceride%, large VLDL-% and CETP activity (p<0.05), while type IV collagen was increased (p=0.009) and inversely correlated with large VLDL-% (p=0.045). CONCLUSIONS In MetS, NAFLD is associated with larger and triglyceride over-enriched circulating VLDLs, of greater atherogenicity. However, when NAFLD progresses to severe fibrosis, circulating VLDL features apparently improved, probably due to early alterations in hepatic synthetic function.
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Affiliation(s)
- Diego Lucero
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Departamento de Bioquímica Clínica, Laboratorio de Lípidos y Aterosclerosis, Argentina; Universidad de Buenos Aires, Instituto de Fisiopatología y Bioquímica Clínica (INFIBIOC), Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina.
| | - Verónica Miksztowicz
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Departamento de Bioquímica Clínica, Laboratorio de Lípidos y Aterosclerosis, Argentina; Universidad de Buenos Aires, Instituto de Fisiopatología y Bioquímica Clínica (INFIBIOC), Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina
| | - Gisela Gualano
- Liver Unit, Department of Medicine, Hospital Nacional "Profesor Alejandro Posadas", El Palomar, Buenos Aires, Argentina
| | - Cristina Longo
- Liver Unit, Department of Medicine, Hospital Nacional "Profesor Alejandro Posadas", El Palomar, Buenos Aires, Argentina
| | - Graciela Landeira
- Liver Unit, Department of Medicine, Hospital Nacional "Profesor Alejandro Posadas", El Palomar, Buenos Aires, Argentina
| | - Estela Álvarez
- Pathology Service, Hospital Nacional Profesor Alejandro Posadas, El Palomar, Buenos Aires, Argentina
| | - Valeria Zago
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Departamento de Bioquímica Clínica, Laboratorio de Lípidos y Aterosclerosis, Argentina; Universidad de Buenos Aires, Instituto de Fisiopatología y Bioquímica Clínica (INFIBIOC), Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina
| | - Fernando Brites
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Departamento de Bioquímica Clínica, Laboratorio de Lípidos y Aterosclerosis, Argentina; Universidad de Buenos Aires, Instituto de Fisiopatología y Bioquímica Clínica (INFIBIOC), Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina
| | - Gabriela Berg
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Departamento de Bioquímica Clínica, Laboratorio de Lípidos y Aterosclerosis, Argentina; Universidad de Buenos Aires, Instituto de Fisiopatología y Bioquímica Clínica (INFIBIOC), Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina
| | - Eduardo Fassio
- Liver Unit, Department of Medicine, Hospital Nacional "Profesor Alejandro Posadas", El Palomar, Buenos Aires, Argentina
| | - Laura Schreier
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Departamento de Bioquímica Clínica, Laboratorio de Lípidos y Aterosclerosis, Argentina; Universidad de Buenos Aires, Instituto de Fisiopatología y Bioquímica Clínica (INFIBIOC), Argentina
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Lucero D, Olano C, Bursztyn M, Morales C, Stranges A, Friedman S, Macri EV, Schreier L, Zago V. Supplementation with n-3, n-6, n-9 fatty acids in an insulin-resistance animal model: does it improve VLDL quality? Food Funct 2017; 8:2053-2061. [DOI: 10.1039/c7fo00252a] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Could supplementation with n-3, n-6 and n-9 fatty acids prevent atherogenic alterations of VLDL produced in insulin-resistance?
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Affiliation(s)
- D. Lucero
- Universidad de Buenos Aires
- Facultad de Farmacia y Bioquímica
- Departamento de Bioquímica Clínica
- Laboratorio de Lípidos y Aterosclerosis
- Buenos Aires
| | - C. Olano
- Universidad de Buenos Aires
- Facultad de Farmacia y Bioquímica
- Departamento de Bioquímica Clínica
- Laboratorio de Lípidos y Aterosclerosis
- Buenos Aires
| | - M. Bursztyn
- Universidad de Buenos Aires
- Facultad de Farmacia y Bioquímica
- Departamento de Bioquímica Clínica
- Laboratorio de Lípidos y Aterosclerosis
- Buenos Aires
| | - C. Morales
- Universidad de Buenos Aires
- Facultad de Medicina
- Instituto de Fisiopatología Cardiovascular (INFICA)
- Buenos Aires
- Argentina
| | - A. Stranges
- Universidad de Buenos Aires
- Facultad de Odontología
- Cátedra de Bioquímica General y Bucal
- Buenos Aires
- Argentina
| | - S. Friedman
- Universidad de Buenos Aires
- Facultad de Odontología
- Cátedra de Bioquímica General y Bucal
- Buenos Aires
- Argentina
| | - E. V. Macri
- Universidad de Buenos Aires
- Facultad de Odontología
- Cátedra de Bioquímica General y Bucal
- Buenos Aires
- Argentina
| | - L. Schreier
- Universidad de Buenos Aires
- Facultad de Farmacia y Bioquímica
- Departamento de Bioquímica Clínica
- Laboratorio de Lípidos y Aterosclerosis
- Buenos Aires
| | - V. Zago
- Universidad de Buenos Aires
- Facultad de Farmacia y Bioquímica
- Departamento de Bioquímica Clínica
- Laboratorio de Lípidos y Aterosclerosis
- Buenos Aires
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Molecular mechanism of hepatic steatosis: pathophysiological role of autophagy. Expert Rev Mol Med 2016; 18:e14. [PMID: 27499351 DOI: 10.1017/erm.2016.14] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
UNLABELLED Steatosis is an early characteristic in the pathogenesis of fatty liver disease (FLD). Mechanisms of hepatic steatosis are aetiology-dependent. Activation of autophagy in liver ameliorates hepatic steatosis. A modulation of hepatic autophagy affects the degree of hepatocyte steatosis and the progression of FLD as demonstrated by pre-clinical models and clinical trials. This review summarises recent advances on pathophysiological roles of autophagy in hepatic lipid metabolism. A comprehensive regulation of autophagic networks holds promise for the improvement of hepatic steatosis. Autophagic signalling pathway may be a novel therapeutic target against FLD. HIGHLIGHTS • Hepatic steatosis is a pathological condition wherein vacuoles of triglyceride (TG) fat are overaccumulated in liver because of abnormal metabolism of lipids. • Hepatic autophagy regulates lipid metabolism as demonstrated by macrolipophagy in response to starvation and hepatic overabundance of TG in obesity. • Autophagic signals are closely associated with apoptotic pathways. There is distinctive relationship between hepatic autophagy and apoptosis, which affects the progression of fatty liver. • Regulation of autophagic process can be a novel therapeutic strategy for fatty liver disease.
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Lucero D, López GI, Gorzalczany S, Duarte M, González Ballerga E, Sordá J, Schreier L, Zago V. Alterations in triglyceride rich lipoproteins are related to endothelial dysfunction in metabolic syndrome. Clin Biochem 2016; 49:932-5. [DOI: 10.1016/j.clinbiochem.2016.04.016] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Revised: 04/13/2016] [Accepted: 04/25/2016] [Indexed: 11/29/2022]
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Alsina E, Macri EV, Lifshitz F, Bozzini C, Rodriguez PN, Boyer PM, Friedman SM. Efficacy of phytosterols and fish-oil supplemented high-oleic-sunflower oil rich diets in hypercholesterolemic growing rats. Int J Food Sci Nutr 2016; 67:441-53. [PMID: 26983467 DOI: 10.3109/09637486.2016.1161010] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Phytosterols (P) and fish-oil (F) efficacy on high-oleic-sunflower oil (HOSO) diets were assessed in hypercholesterolemic growing rats. Controls (C) received a standard diet for 8 weeks; experimental rats were fed an atherogenic diet (AT) for 3 weeks, thereafter were divided into four groups fed for 5 weeks a monounsaturated fatty acid diet (MUFA) containing either: extra virgin olive oil (OO), HOSO or HOSO supplemented with P or F. The diets did not alter body weight or growth. HOSO-P and HOSO-F rats showed reduced total cholesterol (T-chol), non-high-density lipoprotein-cholesterol (non-HDL-chol) and triglycerides and increased HDL-chol levels, comparably to the OO rats. Total body fat (%) was similar among all rats; but HOSO-F showed the lowest intestinal, epididymal and perirenal fat. However, bone mineral content and density, and bone yield stress and modulus of elasticity were unchanged. Growing hypercholesterolemic rats fed HOSO with P or F improved serum lipids and fat distribution, but did not influence material bone quality.
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Affiliation(s)
- Estefania Alsina
- a Department of Biochemistry, School of Dentistry , University of Buenos Aires , Buenos Aires , Argentina
| | - Elisa V Macri
- a Department of Biochemistry, School of Dentistry , University of Buenos Aires , Buenos Aires , Argentina
| | - Fima Lifshitz
- b Pediatric Sunshine Academics Inc , Santa Barbara , CA , USA
| | - Clarisa Bozzini
- c Department of Physiology, School of Dentistry , University of Buenos Aires , Buenos Aires , Argentina
| | - Patricia N Rodriguez
- a Department of Biochemistry, School of Dentistry , University of Buenos Aires , Buenos Aires , Argentina
| | - Patricia M Boyer
- c Department of Physiology, School of Dentistry , University of Buenos Aires , Buenos Aires , Argentina
| | - Silvia M Friedman
- d Department of General and Oral Biochemistry, School of Dentistry , University of Buenos Aires , Buenos Aires , Argentina
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Macri EV, Lifshitz F, Alsina E, Juiz N, Zago V, Lezón C, Rodriguez PN, Schreier L, Boyer PM, Friedman SM. Monounsaturated fatty acids-rich diets in hypercholesterolemic-growing rats. Int J Food Sci Nutr 2015; 66:400-8. [PMID: 25830945 DOI: 10.3109/09637486.2015.1025719] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The effects of replacing dietary saturated fat by different monounsaturated fatty acid (ω-9MUFA) sources on serum lipids, body fat and bone in growing hypercholesterolemic rats were studied. Rats received one of the six different diets: AIN-93G (control, C); extra virgin olive oil (OO) + C; high-oleic sunflower oil (HOSO) + C or atherogenic diet (AT) for 8 weeks; the remaining two groups received AT for 3 weeks and then, the saturated fat was replaced by an oil mixture of soybean oil added with OO or HOSO for 5 weeks. Rats consuming MUFA-rich diets showed the highest body fat, hepatic index and epididymal, intestinal and perirenal fat, and triglycerides. T-chol and non-HDL-chol were increased in HOSO rats but decreased in OO rats. Bone mineral content and density were higher in both OO and HOSO groups than in AT rats. This study casts caution to the generalization of the benefits of MUFA for the treatment of hypercholesterolemia.
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Affiliation(s)
- Elisa V Macri
- Department of Biochemistry, School of Dentistry, University of Buenos Aires , Buenos Aires , Argentina
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Lucero D, Miksztowicz V, Macri V, López GH, Friedman S, Berg G, Zago V, Schreier L. Overproduction of altered VLDL in an insulin-resistance rat model: Influence of SREBP-1c and PPAR-α. CLINICA E INVESTIGACION EN ARTERIOSCLEROSIS 2015; 27:167-74. [PMID: 25796423 DOI: 10.1016/j.arteri.2014.11.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Revised: 11/06/2014] [Accepted: 11/07/2014] [Indexed: 11/16/2022]
Abstract
BACKGROUND In insulin-resistance, VLDL presents alterations that increase its atherogenic potential. The mechanism by which insulin-resistance promotes the production of altered VLDL is still not completely understood. The aim of this study was to evaluate the relationship between the expression of sterol regulatory element binding protein 1c (SREBP-1c) and of peroxisome proliferator-activated receptor-α (PPAR-α), with the features of composition and size of VLDL in an insulin-resistance rat model induced by a sucrose rich diet (SRD). METHODS The study was conducted on 12 male Wistar rats (180g) receiving SRD (12 weeks) and 12 controls. Lipid profile, free fatty acids, glucose, and insulin were measured. Lipid content in liver and visceral fat were assessed. Isolated VLDL (d<1.006g/ml) was characterized by its chemical composition and size by HPLC. The respective hepatic expression of SREBP-1c and PPAR-α was determined (Western blot). RESULTS As expected, SRD had elevated triglycerides (TG), free fatty acids and insulin levels, and decreased HDL-cholesterol (p<0.05), together with augmented hepatic and visceral fat (p<0.05). SRD showed higher VLDL total mass - with increased TG content - and predominance of large VLDL (p<0.05). SRD showed an increase in SREBP-1c (precursor and mature forms) and decreased PPAR-α expression (p<0.045). SREBP-1c forms were positively associated with VLDL total mass (p<0.04), VLDL-TG% (p<0.019), and large VLDL% (p<0.002). On the other hand, PPAR-α correlated negatively with VLDL total mass (p=0.05), VLDL-TG% (p=0.005), and large VLDL% (p=0.002). CONCLUSIONS Insulin-resistance, by coordinated activation of SREBP-1c and reduction of PPAR-α, could promote the secretion of larger and TG over-enriched VLDL particles, with greater atherogenic capacity.
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Affiliation(s)
- Diego Lucero
- Laboratory of Lipids and Atherosclerosis, Department of Clinical Biochemistry, Faculty of Pharmacy and Biochemistry, INFIBIOC, University of Buenos Aires, Buenos Aires, Argentina.
| | - Verónica Miksztowicz
- Laboratory of Lipids and Atherosclerosis, Department of Clinical Biochemistry, Faculty of Pharmacy and Biochemistry, INFIBIOC, University of Buenos Aires, Buenos Aires, Argentina
| | - Vanesa Macri
- Oral and General Biochemistry Department, Faculty of Dentistry, University of Buenos Aires, Buenos Aires, Argentina
| | - Gustavo H López
- Bioanalytics, Department of Biology, Biochemistry and Pharmacy, National Southern University, Bahía Blanca, Buenos Aires, Argentina
| | - Silvia Friedman
- Oral and General Biochemistry Department, Faculty of Dentistry, University of Buenos Aires, Buenos Aires, Argentina
| | - Gabriela Berg
- Laboratory of Lipids and Atherosclerosis, Department of Clinical Biochemistry, Faculty of Pharmacy and Biochemistry, INFIBIOC, University of Buenos Aires, Buenos Aires, Argentina
| | - Valeria Zago
- Laboratory of Lipids and Atherosclerosis, Department of Clinical Biochemistry, Faculty of Pharmacy and Biochemistry, INFIBIOC, University of Buenos Aires, Buenos Aires, Argentina
| | - Laura Schreier
- Laboratory of Lipids and Atherosclerosis, Department of Clinical Biochemistry, Faculty of Pharmacy and Biochemistry, INFIBIOC, University of Buenos Aires, Buenos Aires, Argentina
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Kikkawa K, Nakajima K, Shimomura Y, Tokita Y, Machida T, Sumino H, Murakami M. Small dense LDL cholesterol measured by homogeneous assay in Japanese healthy controls, metabolic syndrome and diabetes patients with or without a fatty liver. Clin Chim Acta 2014; 438:70-9. [PMID: 25050800 DOI: 10.1016/j.cca.2014.07.017] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2014] [Revised: 06/21/2014] [Accepted: 07/14/2014] [Indexed: 01/07/2023]
Abstract
BACKGROUND Serum small dense LDL-cholesterol (sdLDL-C) levels in healthy controls and the cases with diabetes (T2DM) and metabolic syndrome (MetS) with or without a fatty liver in a large, typical Japanese population was determined. METHODS The plasma lipids and lipoproteins, including sdLDL-C by homogeneous assay, were determined in controls, MetS and T2DM patients (n=5255). The cases with MetS and preliminary MetS (pre-MetS) as well as T2DM and preliminary T2DM (pre-DM) were selected based on the Japanese criteria for MetS and T2DM. Fatty liver was diagnosed using the ultrasonography. RESULTS The 75th percentile values for sdLDL-C were 27.5mg/dl for men and 23.3mg/dl for women and increased with age. The concentrations of sdLDL-C and sdLDL-C/LDL-C were significantly higher in pre-MetS and pre-T2DM patients than healthy controls as well as in MetS and T2DM patients. Significantly higher sdLDL-C was found in cases with a fatty liver than without a fatty liver in all five groups. CONCLUSIONS Significantly elevated sdLDL-C levels were found in pre-MetS, MetS and pre-T2DM, T2DM patients compared to the healthy controls. Fatty liver significantly enhanced serum sdLDL-C levels and the multiple regression analyses ascertained that fatty liver was an independent determinant for sdLDL-C.
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Affiliation(s)
- Koji Kikkawa
- Diabetes and Metabolic Disease Research Center, Hidaka Hospital, Takasaki, Gunma, Japan; Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Maebashi, Gunma, Japan.
| | - Katsuyuki Nakajima
- Diabetes and Metabolic Disease Research Center, Hidaka Hospital, Takasaki, Gunma, Japan; Department of Laboratory Sciences, Gunma University Graduate School of Health Sciences, Maebashi, Gunma, Japan
| | - Younosuke Shimomura
- Diabetes and Metabolic Disease Research Center, Hidaka Hospital, Takasaki, Gunma, Japan
| | - Yoshiharu Tokita
- Department of Laboratory Sciences, Gunma University Graduate School of Health Sciences, Maebashi, Gunma, Japan
| | - Tetsuo Machida
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Maebashi, Gunma, Japan
| | - Hiroyuki Sumino
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Maebashi, Gunma, Japan
| | - Masami Murakami
- Diabetes and Metabolic Disease Research Center, Hidaka Hospital, Takasaki, Gunma, Japan
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Macri E, Lifshitz F, Ramos C, Orzuza R, Costa O, Zago V, Boyer P, Friedman S. Atherogenic cholesterol-rich diet and periodontal disease. Arch Oral Biol 2014; 59:679-86. [DOI: 10.1016/j.archoralbio.2014.03.006] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2013] [Revised: 01/22/2014] [Accepted: 03/12/2014] [Indexed: 01/20/2023]
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Martinez Calejman C, Di Gruccio JM, Mercau ME, Repetto EM, Astort F, Sanchez R, Pandolfi M, Berg G, Schreier L, Arias P, Cymeryng CB. Insulin sensitization with a peroxisome proliferator-activated receptor γ agonist prevents adrenocortical lipid infiltration and secretory changes induced by a high-sucrose diet. J Endocrinol 2012; 214:267-76. [PMID: 22700193 DOI: 10.1530/joe-12-0193] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
It has been hypothesized that deviations in glucocorticoid secretion and/or action may contribute to somatic and biochemical changes observed in patients with and animal models of insulin resistance (IR). In this study, we analyzed changes in rat adrenocortical function and morphology associated with the development of IR, generated in male adult rats by the addition of 30% sucrose to the drinking water. Caloric intake, body and adipose tissue weights, and biochemical parameters associated with IR were determined. Expression levels of Star, Cyp11A1, Mc2r, Pparγ (Pparg), and Cd36 were evaluated by real-time PCR, histochemical analysis of the adrenal cortex was performed using Masson's trichrome and Sudan III staining, and corticosterone levels were measured by RIA. After 7 weeks of sucrose administration, higher serum glucose, insulin, and triglyceride levels and an altered glycemic response to an i.p. insulin test were detected. Adrenal glands showed a neutral lipid infiltration. An increase in Star, Cyp11A1, Mc2r, Pparg and Cd36 and a decrease in Mc2r levels were also found. Furthermore, sucrose-treated animals exhibited higher basal corticosterone levels and a blunted response to ACTH injection. Noteworthy, the adrenocortical (functional and histological) abnormalities were prevented in sucrose-treated rats by the simultaneous administration of an insulin-sensitizing PPARγ agonist. In conclusion, sucrose-induced IR affects adrenocortical morphology and function possibly via the generation of adipokines or lipid metabolites within the adrenal gland. These abnormalities are prevented by the administration of a PPARγ agonist by mechanisms involving both extra- and intra-adrenal effects.
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Affiliation(s)
- Camila Martinez Calejman
- Department of Human Biochemistry, School of Medicine, University of Buenos Aires, CEFYBO, CONICET, Paraguay 2155, Buenos Aires C1121ABG, Argentina
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Liu SH, He SP, Chiang MT. Effects of long-term feeding of chitosan on postprandial lipid responses and lipid metabolism in a high-sucrose-diet-impaired glucose-tolerant rat model. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2012; 60:4306-4313. [PMID: 22494277 DOI: 10.1021/jf300792b] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
This study was designed to investigate the effects of long-term feeding of chitosan on postprandial lipid response and lipid metabolism in a high-sucrose (HS)-diet-impaired glucose-tolerant rat model. As the results, HS-diet-fed rats supplemented with 5 and 7% chitosan in diets for 9 weeks had lower postprandial plasma total cholesterol (TC) levels, but 7% chitosan in the diet had higher postprandial plasma triglyceride (TG) and TG-rich lipoprotein TG levels. Supplementation of chitosan significantly decreased the postprandial ratio of apolipoprotein B (apoB)48/apoB100 in TG-rich lipoprotein fractions of HS-diet-fed rats. Long-term supplementation of 5 and 7% chitosan in diets for 16 weeks had lower plasma TC, low-density lipoprotein cholesterol (LDL-C) + very low density lipoprotein cholesterol (VLDL-C), TC/high-density lipoprotein (HDL-C) ratio, leptin, and tumor necrosis factor-α (TNF-α) levels in HS-diet-fed rats. Moreover, it was noticed that the VLDL receptor (VLDLR) protein expression in skeletal muscles of HS-diet-fed rats was significantly decreased, which could be significantly reversed by supplementation of 5 and 7% chitosan. Rats supplemented with 7% chitosan in the diet significantly elevated the lipolysis rate and decreased the accumulation of TG in epididymal fat pads of HS-diet-fed rats. The plasma angiopoietin-like 4 (ANGPTL4) protein expression was not affected in HS-diet-fed rats, but it was significantly increased in 7% chitosan-supplemented HS-diet-fed rats. Taken together, these results indicate that supplementation of chitosan in the diet can improve the impairment of lipid metabolism in a HS-diet-fed rat model, but long-term high-dose chitosan feeding may enhance postprandial plasma TG and TG-rich lipoprotein TG levels in HS-diet-fed rats through an ANGPTL4-regulated pathway.
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Affiliation(s)
- Shing-Hwa Liu
- Institute of Toxicology, College of Medicine, National Taiwan University, Taipei 100, Taiwan
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Macri EV, Gonzales Chaves MM, Rodriguez PN, Mandalunis P, Zeni S, Lifshitz F, Friedman SM. High-fat diets affect energy and bone metabolism in growing rats. Eur J Nutr 2011; 51:399-406. [PMID: 21725629 DOI: 10.1007/s00394-011-0223-2] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2011] [Accepted: 06/17/2011] [Indexed: 11/25/2022]
Abstract
BACKGROUND High-fat diets are usually associated with greater weight (W) gain and body fat (BF). However, it is still unclear whether the type and amount of fat consumed influence BF. Additionally, dietary fat intake may also have consequences on skeletal health. OBJECTIVE To evaluate in healthy growing rats the effects of high-fat diets and type of dietary fat intake (saturated or vegetable oils) on energy and bone metabolism. METHODS At weaning, male Wistar rats (n = 50) were fed either a control diet (C; fat = 7% w/w) or a high-fat diet (20% w/w) containing either: soybean oil, corn oil (CO), linseed oil (LO), or beef tallow (BT) for 8 weeks. Zoometric parameters, BF, food intake and digestibility, and total and bone alkaline phosphatase (b-AP) were assessed. Total skeleton bone mineral density (BMD) and content (BMC), BMC/W, spine BMD, and bone volume (static-histomorphometry) were measured. RESULTS Animals fed BT diet achieved lower W versus C. Rats fed high-fat vegetable oil diets showed similar effects on the zoometric parameters but differed in BF. BT showed the lowest lipid digestibility and BMC. In contrast, high vegetable oil diets produced no significant differences in BMC, BMC/W, BMD, spine BMD, and bone volume. Marked differences were observed for LO and BT groups in b-AP and CO and BT groups in bone volume. CONCLUSION BT diet rich in saturated fatty acids had decreased digestibility and adversely affected energy and bone metabolisms, in growing healthy male rats. There were no changes in zoometric and bone parameters among rats fed high vegetable oil diets.
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Affiliation(s)
- Elisa V Macri
- Department of Biochemistry, School of Dentistry, University of Buenos Aires, Buenos Aires, Argentina
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Bibliography. Current world literature. Adrenal cortex. Curr Opin Endocrinol Diabetes Obes 2011; 18:231-3. [PMID: 21522003 DOI: 10.1097/med.0b013e3283457c7d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Lucero D, Zago V, López GI, Graffigna M, López GH, Fainboim H, Miksztowicz V, Gómez Rosso L, Belli S, Levalle O, Berg G, Brites F, Wikinski R, Schreier L. Does non-alcoholic fatty liver impair alterations of plasma lipoproteins and associated factors in metabolic syndrome? Clin Chim Acta 2011; 412:587-92. [DOI: 10.1016/j.cca.2010.12.012] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2010] [Revised: 12/07/2010] [Accepted: 12/07/2010] [Indexed: 12/11/2022]
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Lucero D, Zago V, López GI, Graffigna M, Fainboim H, Miksztowicz V, Meroño T, Belli S, Levalle O, Wikinski R, Brites F, Berg G, Schreier L. Pro-inflammatory and atherogenic circulating factors in non-alcoholic fatty liver disease associated to metabolic syndrome. Clin Chim Acta 2010; 412:143-7. [PMID: 20887718 DOI: 10.1016/j.cca.2010.09.025] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2010] [Revised: 09/04/2010] [Accepted: 09/20/2010] [Indexed: 12/13/2022]
Abstract
BACKGROUND It is not elucidated if liver fat deposits associated to metabolic syndrome (MS) aggravate the atherogenic state. We evaluated, in MS patients, if the presence of non-alcoholic hepatic steatosis (HS) determines differences in inflammatory markers and VLDL characteristics. METHODS Seventy-five patients with MS were divided into 2 groups depending on the presence or absence of HS, assessed by ultrasound. Lipid profile, free fatty acids (FFA), VLDL composition, adiponectin, tumor necrosis factor-alpha (TNF-α), high sensitivity C-reactive protein (hs-CRP), and soluble adhesion molecules (sVCAM-1 and sICAM-1) were measured. RESULTS HS patients presented increased triglycerides levels, HOMA-IR and FFA. Patients with HS showed a reduction in adiponectin (p = 0.04) and increase in hs-CRP (p = 0.02), independently of insulin-resistance (IR). FFA correlated positively with TNF-α (p = 0.04) and inversely with adiponectin (p = 0.01). hs-CRP correlated with all inflammatory markers, independently of IR: TNF-α (r = 0.34, p = 0.02), sVCAM-1 (r = 0.29 p = 0.03), sICAM-1 (r = 0.56, p = 0.01), adiponectin (r = -0.34, p = 0.04). HS patients presented higher VLDL mass and number of particles. Adiponectin correlated with VLDL cholesterol content (r = -0.47, p = 0.04), independently of IR. VLDL, once secreted, would suffer from changes, becoming more atherogenic. CONCLUSIONS Simple HS would play an important role increasing cardiovascular risk, independently of IR. hs-CRP may represent a useful biomarker of this condition.
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Affiliation(s)
- Diego Lucero
- Laboratory of Lipids and Lipoproteins, Department of Clinical Biochemistry, Faculty of Pharmacy and Biochemistry, INFIBIOC, University of Buenos Aires, Argentina
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