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Rey M, Coirini H, Marchena A, González Deniselle MC, Kruse MS. Effects of metformin on behavioral alterations produced by chronic sucrose consumption in male rats. J Neuroendocrinol 2024; 36:e13362. [PMID: 38148478 DOI: 10.1111/jne.13362] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Revised: 11/11/2023] [Accepted: 11/28/2023] [Indexed: 12/28/2023]
Abstract
Excessive consumption of sugary drinks negatively impacts the developing brain, producing long-lasting behavioral and metabolic disorders. Here, we study whether treatment with the antihyperglycemic agent metformin prevents some of the anxiety and memory alterations produced by chronic sucrose consumption. Male Sprague-Dawley rats had unrestricted access to water (control group) and a bottle containing a 10% sucrose solution (sucrose group, SUC) for 35 days. In parallel, a group of animals from SUC received metformin (25 mg/kg or 50 mg/kg, orally; MET 25 and MET 50 groups, respectively). After 2 weeks of metformin treatment, the animals weighed less than controls. SUC and MET 50 groups compensated for the caloric intake from the sugary solution by consuming less chow. In contrast, total energy intake in MET 25 was higher than the rest of the groups, but they still weighed less than control and SUC groups, suggesting that at this concentration, metformin delays body growth. The animals were then tested for the open field (OF), elevated plus maze (EPM) and novel object location (NOL) tests. In the OF, SUC animals spent more time in the central zone of the arena, evidenced by an increased number of entries and the distance traveled there. In the EPM, SUC animals spent more time in the open arms and less time in the central square. Metformin treatment prevented the decreased anxiety observed in SUC animals in the OF and EPM. In the NOL test, SUC animals showed less interest in novelty and metformin treatment did not improve this alteration. The preference for open spaces in the OF and EPM were associated with increased serum triglycerides (TG) and malondialdehyde levels in the medial prefrontal cortex (mPFC) and the hippocampus (HIP), while poor memory performance was associated with high basal blood glucose levels. In conclusion, the decreased anxiety-like behavior produced by chronic sucrose consumption was prevented by metformin treatment, through a mechanism that probably involves normalization of TG levels and decreased oxidative stress in mPFC and HIP.
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Affiliation(s)
- Mariana Rey
- Laboratorio de Neurobiología, Instituto de Biología y Medicina Experimental-CONICET, Buenos Aires, Argentina
| | - Héctor Coirini
- Laboratorio de Neurobiología, Instituto de Biología y Medicina Experimental-CONICET, Buenos Aires, Argentina
| | - Agustina Marchena
- Laboratorio de Neurobiología, Instituto de Biología y Medicina Experimental-CONICET, Buenos Aires, Argentina
| | - María Claudia González Deniselle
- Laboratorio de Bioquímica Neuroendócrina, Instituto de Biología y Medicina Experimental-CONICET, Buenos Aires, Argentina
- Facultad de Medicina, Departamento de Fisiología, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - María Sol Kruse
- Laboratorio de Neurobiología, Instituto de Biología y Medicina Experimental-CONICET, Buenos Aires, Argentina
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Ehtezazi T, Rahman K, Davies R, Leach AG. The Pathological Effects of Circulating Hydrophobic Bile Acids in Alzheimer's Disease. J Alzheimers Dis Rep 2023; 7:173-211. [PMID: 36994114 PMCID: PMC10041467 DOI: 10.3233/adr-220071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023] Open
Abstract
Recent clinical studies have revealed that the serum levels of toxic hydrophobic bile acids (deoxy cholic acid, lithocholic acid [LCA], and glycoursodeoxycholic acid) are significantly higher in patients with Alzheimer's disease (AD) and amnestic mild cognitive impairment (aMCI) when compared to control subjects. The elevated serum bile acids may be the result of hepatic peroxisomal dysfunction. Circulating hydrophobic bile acids are able to disrupt the blood-brain barrier and promote the formation of amyloid-β plaques through enhancing the oxidation of docosahexaenoic acid. Hydrophobic bile acid may find their ways into the neurons via the apical sodium-dependent bile acid transporter. It has been shown that hydrophobic bile acids impose their pathological effects by activating farnesoid X receptor and suppressing bile acid synthesis in the brain, blocking NMDA receptors, lowering brain oxysterol levels, and interfering with 17β-estradiol actions such as LCA by binding to E2 receptors (molecular modelling data exclusive to this paper). Hydrophobic bile acids may interfere with the sonic hedgehog signaling through alteration of cell membrane rafts and reducing brain 24(S)-hydroxycholesterol. This article will 1) analyze the pathological roles of circulating hydrophobic bile acids in the brain, 2) propose therapeutic approaches, and 3) conclude that consideration be given to reducing/monitoring toxic bile acid levels in patients with AD or aMCI, prior/in combination with other treatments.
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Affiliation(s)
- Touraj Ehtezazi
- School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, Liverpool, UK
| | - Khalid Rahman
- School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, Liverpool, UK
| | - Rhys Davies
- The Walton Centre, NHS Foundation Trust, Liverpool, UK
| | - Andrew G Leach
- School of Pharmacy, University of Manchester, Manchester, UK
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Coirini H, Rey M, Gonzalez Deniselle MC, Kruse MS. Long-Term Memory Function Impairments following Sucrose Exposure in Juvenile versus Adult Rats. Biomedicines 2022; 10:biomedicines10112723. [PMID: 36359243 PMCID: PMC9687305 DOI: 10.3390/biomedicines10112723] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 10/21/2022] [Accepted: 10/25/2022] [Indexed: 11/30/2022] Open
Abstract
We previously described that excessive consumption of sucrose during youth produces fear memory and anxiety-like behavior in adulthood. Here, we evaluated whether high cognitive function is also affected by studying early sucrose consumption in object recognition memory (NOR). Male Sprague Dawley rats were tested for short-term, long-term, and consolidated NOR after 25 days of unlimited sucrose access in juvenile (PD 25–50) or adult age (PD 75–100). All rats spent equal time exploring the two objects during the sample phase T1. When animals were exposed for 2, 24 h or 7 days later to a copy of the objects presented in T1 and a novel object, the sucrose-exposed juvenile group failed to distinguish between the familiar and the novel objects in contrast with the rest of the groups. Sucrose-exposed animals developed hypertriglyceridemia and glucose intolerance, but juvenile animals showed increased fasting glycemia and sustained the glucose intolerance longer. Moreover, sucrose decreased hippocampal proBDNF expression in juveniles while it was increased in adults, and sucrose also increased RAGE expression in adults. The NOR exploration ratio correlated negatively with basal glycemia and positively with proBDNF. Taken together, these data suggest that sucrose-induced alterations in glucose metabolism may contribute to a long-term decline in proBDNF and impaired recognition memory.
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Affiliation(s)
- Héctor Coirini
- Laboratorio de Neurobiología, Instituto de Biología y Medicina Experimental-CONICET, Vuelta de Obligado 2490, Buenos Aires C1428ADN, Argentina
- Correspondence: ; Tel.: +54-11-4783-2869 (ext. 1250); Fax: +54-11-4786-2564
| | - Mariana Rey
- Laboratorio de Neurobiología, Instituto de Biología y Medicina Experimental-CONICET, Vuelta de Obligado 2490, Buenos Aires C1428ADN, Argentina
| | - María Claudia Gonzalez Deniselle
- Laboratorio de Bioquímica Neuroendócrina, Instituto de Biología y Medicina Experimental-CONICET, Vuelta de Obligado 2490, Buenos Aires C1428ADN, Argentina
- Departamento de Fisiología, Facultad de Medicina, Universidad de Buenos Aires, Paraguay 2155, Buenos Aires C1121ABG, Argentina
| | - María Sol Kruse
- Laboratorio de Neurobiología, Instituto de Biología y Medicina Experimental-CONICET, Vuelta de Obligado 2490, Buenos Aires C1428ADN, Argentina
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Rey M, Kruse MS, Magrini-Huamán RN, Gómez J, Simirgiotis MJ, Tapia A, Feresin GE, Coirini H. Tessaria absinthioides (Hook. & Arn.) DC. (Asteraceae) Decoction Improves the Hypercholesterolemia and Alters the Expression of LXRs in Rat Liver and Hypothalamus. Metabolites 2021; 11:579. [PMID: 34564396 PMCID: PMC8467473 DOI: 10.3390/metabo11090579] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Revised: 08/05/2021] [Accepted: 08/23/2021] [Indexed: 11/17/2022] Open
Abstract
Chronic high-fat diet consumption induces hypercholesterolemia. The effect of Tessaria absinthioides (Hook. & Arn.) DC. (Asteraceae) was studied on the levels of total cholesterol (TC), high-density lipoprotein cholesterol (HDL-c), and triglycerides, and on the expression of liver X receptors (LXRs) in a hypercholesterolemic model. Adult male rats received a normal diet (ND) or a high-fat diet (HFD; normal diet + bovine fat + cholesterol). After 14 days, rats received water (W) or a decoction of the aerial parts of T. absinthioides (Ta; 10% w/v) for 2, 4, or 6 weeks. Four and six weeks of Ta improved the levels of TC and HDL-c in HFD. After 6 weeks of Ta, the expression of LXRs in HFD was the same as that in ND in both tissues. The Ta chemical profile was studied with an ultrahigh resolution liquid chromatography Orbitrap MS analysis (UHPLC-PDA-OT-MS/MS). Fifty-one compounds were identified, of which twelve are reported for the first time. Among these compounds, caffeoylquinic acid and its derivatives could modify the lipid profile and the expression of LXRs. This is the first in vivo report of T. absinthioides, which may be a potential candidate against hypercholesterolemia.
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Affiliation(s)
- Mariana Rey
- Laboratorio de Neurobiología, Instituto de Biología y Medicina Experimental (IBYME-CONICET), Ciudad Autónoma de Buenos Aires (CABA) C1428ADN, Vuelta de Obligado 2490, Argentina
| | - María S Kruse
- Laboratorio de Neurobiología, Instituto de Biología y Medicina Experimental (IBYME-CONICET), Ciudad Autónoma de Buenos Aires (CABA) C1428ADN, Vuelta de Obligado 2490, Argentina
| | - Rocío N Magrini-Huamán
- Laboratorio de Neurobiología, Instituto de Biología y Medicina Experimental (IBYME-CONICET), Ciudad Autónoma de Buenos Aires (CABA) C1428ADN, Vuelta de Obligado 2490, Argentina
- Instituto de Biotecnología-Instituto de Ciencias Básicas, Universidad Nacional de San Juan (UNSJ), Av. Libertador General San Martín 1109 (O), San Juan CP 5400, Argentina
- Facultad de Ciencias Médicas, Universidad Católica de Cuyo, Av. José Ignacio de la Roza 1516, San Juan 5400, Argentina
| | - Jessica Gómez
- Instituto de Biotecnología-Instituto de Ciencias Básicas, Universidad Nacional de San Juan (UNSJ), Av. Libertador General San Martín 1109 (O), San Juan CP 5400, Argentina
| | - Mario J Simirgiotis
- Instituto de Farmacia, Facultad de Ciencias, Campus Isla Teja, Universidad Austral de Chile, Valdivia 5090000, Chile
- Center for Interdisciplinary Studies on the Nervous System (CISNe), Universidad Austral de Chile, Valdivia 5090000, Chile
| | - Alejandro Tapia
- Instituto de Biotecnología-Instituto de Ciencias Básicas, Universidad Nacional de San Juan (UNSJ), Av. Libertador General San Martín 1109 (O), San Juan CP 5400, Argentina
| | - Gabriela E Feresin
- Instituto de Biotecnología-Instituto de Ciencias Básicas, Universidad Nacional de San Juan (UNSJ), Av. Libertador General San Martín 1109 (O), San Juan CP 5400, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), CABA, Godoy Cruz 2290 (C1425FQB), Argentina
| | - Héctor Coirini
- Laboratorio de Neurobiología, Instituto de Biología y Medicina Experimental (IBYME-CONICET), Ciudad Autónoma de Buenos Aires (CABA) C1428ADN, Vuelta de Obligado 2490, Argentina
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Deol P, Kozlova E, Valdez M, Ho C, Yang EW, Richardson H, Gonzalez G, Truong E, Reid J, Valdez J, Deans JR, Martinez-Lomeli J, Evans JR, Jiang T, Sladek FM, Curras-Collazo MC. Dysregulation of Hypothalamic Gene Expression and the Oxytocinergic System by Soybean Oil Diets in Male Mice. Endocrinology 2020; 161:5698148. [PMID: 31912136 PMCID: PMC7041656 DOI: 10.1210/endocr/bqz044] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Accepted: 01/04/2020] [Indexed: 01/04/2023]
Abstract
Soybean oil consumption has increased greatly in the past half-century and is linked to obesity and diabetes. To test the hypothesis that soybean oil diet alters hypothalamic gene expression in conjunction with metabolic phenotype, we performed RNA sequencing analysis using male mice fed isocaloric, high-fat diets based on conventional soybean oil (high in linoleic acid, LA), a genetically modified, low-LA soybean oil (Plenish), and coconut oil (high in saturated fat, containing no LA). The 2 soybean oil diets had similar but nonidentical effects on the hypothalamic transcriptome, whereas the coconut oil diet had a negligible effect compared to a low-fat control diet. Dysregulated genes were associated with inflammation, neuroendocrine, neurochemical, and insulin signaling. Oxt was the only gene with metabolic, inflammation, and neurological relevance upregulated by both soybean oil diets compared to both control diets. Oxytocin immunoreactivity in the supraoptic and paraventricular nuclei of the hypothalamus was reduced, whereas plasma oxytocin and hypothalamic Oxt were increased. These central and peripheral effects of soybean oil diets were correlated with glucose intolerance but not body weight. Alterations in hypothalamic Oxt and plasma oxytocin were not observed in the coconut oil diet enriched in stigmasterol, a phytosterol found in soybean oil. We postulate that neither stigmasterol nor LA is responsible for effects of soybean oil diets on oxytocin and that Oxt messenger RNA levels could be associated with the diabetic state. Given the ubiquitous presence of soybean oil in the American diet, its observed effects on hypothalamic gene expression could have important public health ramifications.
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Affiliation(s)
- Poonamjot Deol
- Department of Molecular, Cell and Systems Biology, University of California, Riverside, California
| | - Elena Kozlova
- Department of Molecular, Cell and Systems Biology, University of California, Riverside, California
- Neuroscience Graduate Program, University of California, Riverside, California
| | - Matthew Valdez
- Department of Molecular, Cell and Systems Biology, University of California, Riverside, California
- Neuroscience Graduate Program, University of California, Riverside, California
| | - Catherine Ho
- Department of Molecular, Cell and Systems Biology, University of California, Riverside, California
| | - Ei-Wen Yang
- Department of Computer Science and Engineering, University of California Riverside, California
| | - Holly Richardson
- Department of Molecular, Cell and Systems Biology, University of California, Riverside, California
| | - Gwendolyn Gonzalez
- Department of Molecular, Cell and Systems Biology, University of California, Riverside, California
| | - Edward Truong
- Department of Molecular, Cell and Systems Biology, University of California, Riverside, California
| | - Jack Reid
- Department of Molecular, Cell and Systems Biology, University of California, Riverside, California
| | - Joseph Valdez
- Department of Molecular, Cell and Systems Biology, University of California, Riverside, California
| | - Jonathan R Deans
- Department of Molecular, Cell and Systems Biology, University of California, Riverside, California
| | - Jose Martinez-Lomeli
- Department of Molecular, Cell and Systems Biology, University of California, Riverside, California
| | - Jane R Evans
- Department of Molecular, Cell and Systems Biology, University of California, Riverside, California
| | - Tao Jiang
- Department of Computer Science and Engineering, University of California Riverside, California
| | - Frances M Sladek
- Department of Molecular, Cell and Systems Biology, University of California, Riverside, California
| | - Margarita C Curras-Collazo
- Department of Molecular, Cell and Systems Biology, University of California, Riverside, California
- Neuroscience Graduate Program, University of California, Riverside, California
- Correspondence: Margarita C. Curras-Collazo, PhD, FAPS, Department of Molecular, Cell and Systems Biology, University of California, 2110 Biological Sciences Building, Riverside, California 92521. E-mail:
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High-Fat Diets and LXRs Expression in Rat Liver and Hypothalamus. Cell Mol Neurobiol 2019; 39:963-974. [DOI: 10.1007/s10571-019-00692-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Accepted: 05/25/2019] [Indexed: 12/25/2022]
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Kruse MS, Vadillo MJ, Miguelez Fernández AMM, Rey M, Zanutto BS, Coirini H. Sucrose exposure in juvenile rats produces long-term changes in fear memory and anxiety-like behavior. Psychoneuroendocrinology 2019; 104:300-307. [PMID: 30928734 DOI: 10.1016/j.psyneuen.2019.03.016] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Revised: 03/12/2019] [Accepted: 03/19/2019] [Indexed: 12/31/2022]
Abstract
Sugar consumption has increased dramatically in our society, a phenomenon that is primarily associated with obesity and diabetes appearance. However, whether this overconsumption of sugar has an impact on the developing CNS remains unknown. This study investigated the long-term effects of unlimited access to sucrose using the two-bottle choice paradigm and the juvenile and adult effects were compared. Male Sprague Dawley rats had free access to water containing 10% sucrose and water during youth (PD 25-50) or adulthood (PD 75-100). Rats in the sucrose group, privileged to take sugary solution over the water. No weight differences were observed between the sucrose groups and their age-matched water controls. After treatment all animals drank only water for another 25 days. Frustration, measured as the amount of water drank after the sucrose period, was higher in young-exposed animals compared to adults. In addition, rats that consumed sucrose during youth travelled less the central zones of an open field. Sucrose consumption during youth also affected fear behavior as animals exhibited impaired extinction of fear memory compared to control, indicating that prefrontal and hippocampal function is impaired. In contrast, rats exposed to sucrose during adulthood did not behave significantly different from control on either task. The calretinin and parvalbumin GABAergic interneurons go through extensive remodeling during youth in the medial prefrontal cortex and the ventral hippocampus. Here, we found that rats exposed to sucrose during youth presented an increased expression of calretinin-immunoreactivity in the medial prefrontal cortex, but not in the ventral hippocampus, indicating that early sucrose consumption produces enduring effects on the GABA system. Altogether these results indicate that sugar overconsumption at early stages of life induces long-term effects on behaviors related to fear and anxiety in adulthood.
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Affiliation(s)
- María Sol Kruse
- Laboratorio de Neurobiología, Instituto de Biología y Medicina Experimental-CONICET, Vuelta de Obligado 2490, C1428ADN, Buenos Aires, Argentina.
| | - Martín Javier Vadillo
- Laboratorio de Neurobiología, Instituto de Biología y Medicina Experimental-CONICET, Vuelta de Obligado 2490, C1428ADN, Buenos Aires, Argentina
| | | | - Mariana Rey
- Laboratorio de Neurobiología, Instituto de Biología y Medicina Experimental-CONICET, Vuelta de Obligado 2490, C1428ADN, Buenos Aires, Argentina
| | - Bonifacio Silvano Zanutto
- Laboratorio de Biología del Comportamiento, Instituto de Biología y Medicina Experimental-CONICET, Vuelta de Obligado 2490, C1428ADN, Buenos Aires, Argentina
| | - Héctor Coirini
- Laboratorio de Neurobiología, Instituto de Biología y Medicina Experimental-CONICET, Vuelta de Obligado 2490, C1428ADN, Buenos Aires, Argentina; Depto. de Bioquímica Humana, Facultad de Medicina, Universidad de Buenos Aires, Paraguay 2155, C1121ABG, Buenos Aires, Argentina
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Khieokhajonkhet A, Aeksiri N, Kaneko G. Molecular characterization and homology modeling of liver X receptor in Asian seabass, Lates calcarifer: predicted functions in reproduction and lipid metabolism. FISH PHYSIOLOGY AND BIOCHEMISTRY 2019; 45:523-538. [PMID: 30806874 DOI: 10.1007/s10695-019-00617-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Accepted: 02/06/2019] [Indexed: 06/09/2023]
Abstract
Liver X receptor (LXR) is a ligand-activated transcription factor that plays vital roles in maintaining cholesterol and lipid homeostasis. Much work has been done on mammalian LXRs, but the role of LXR in fish remains unclear. In the present study, LXR gene was identified from adult Asian seabass, Lates calcarifer, and its predicted protein structure was docked with several cholesterol derivatives at the binding site. The LXR cDNA consisted of 1495 bp encoding a putative LXR protein of 494 amino acids. The Asian seabass LXR retained many important structural features found in LXRs of other fishes and mammals, such as putative signal peptide, activation function-1 (AF-1) domain, DNA-binding domain (DBD), ligand-binding domain (LBD), activation function-2 (AF-2) domain, and eight conserved cysteine residues. The deduced amino acid sequence of LXR shared significant identity with those of other species ranging from 65.7 to 95.8%. The homology modeling and in silico molecular docking demonstrated that Asian seabass LXR could interact with cholesterol derivatives at amino acid residues Phe274 and Ile312. Real-time PCR further revealed that LXR transcripts are ubiquitously expressed in all tissues examined, with the highest levels detected in the gonad followed by the liver. Given the well-known importance of cholesterol-mediated signaling in these tissues, Asian seabass LXR may reasonably be involved in reproduction and lipid metabolism.
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Affiliation(s)
- Anurak Khieokhajonkhet
- Center for Agriculture Biotechnology, Faculty of Agriculture, Natural Resources, and Environment, Naresuan University, Phitsanulok, 65000, Thailand.
- Department of Agricultural Sciences, Faculty of Agriculture, Natural Resources, and Environment, Naresuan University, 99 M. 1, T. Thapo, A. Muang, Phitsanulok, 65000, Thailand.
| | - Niran Aeksiri
- Center for Agriculture Biotechnology, Faculty of Agriculture, Natural Resources, and Environment, Naresuan University, Phitsanulok, 65000, Thailand
- Department of Agricultural Sciences, Faculty of Agriculture, Natural Resources, and Environment, Naresuan University, 99 M. 1, T. Thapo, A. Muang, Phitsanulok, 65000, Thailand
| | - Gen Kaneko
- School of Arts and Sciences, University of Houston-Victoria, 3007 N. Ben Wilson, Victoria, TX, 77901, USA
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Kruse MS, Suarez LG, Coirini H. LXR activation increases the expression of GnRH AND αMSH in the rat hypothalamus in vivo. Neurosci Lett 2018; 664:20-27. [DOI: 10.1016/j.neulet.2017.11.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2017] [Revised: 10/11/2017] [Accepted: 11/07/2017] [Indexed: 11/25/2022]
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10
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Peng L, Zhao XS, Peng D. Anti-obesity Effect of a Novel Potent Synthetic Steroidal Liver X Receptor α (LXRα)-selective Agonist in Male ob/ob C57BL/6 Mice. INT J PHARMACOL 2017. [DOI: 10.3923/ijp.2017.636.642] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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11
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Kruse MS, Suarez LG, Coirini H. Regulation of the expression of LXR in rat hypothalamic and hippocampal explants. Neurosci Lett 2017; 639:53-58. [DOI: 10.1016/j.neulet.2016.12.065] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Revised: 12/16/2016] [Accepted: 12/26/2016] [Indexed: 01/08/2023]
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12
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In vitro evidence in rainbow trout supporting glucosensing mediated by sweet taste receptor, LXR, and mitochondrial activity in Brockmann bodies, and sweet taste receptor in liver. Comp Biochem Physiol B Biochem Mol Biol 2016; 200:6-16. [DOI: 10.1016/j.cbpb.2016.04.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2016] [Revised: 04/25/2016] [Accepted: 04/27/2016] [Indexed: 12/31/2022]
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13
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Kaneko T, Kanno C, Ichikawa-Tomikawa N, Kashiwagi K, Yaginuma N, Ohkoshi C, Tanaka M, Sugino T, Imura T, Hasegawa H, Chiba H. Liver X receptor reduces proliferation of human oral cancer cells by promoting cholesterol efflux via up-regulation of ABCA1 expression. Oncotarget 2016; 6:33345-57. [PMID: 26452260 PMCID: PMC4741770 DOI: 10.18632/oncotarget.5428] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Accepted: 09/18/2015] [Indexed: 11/25/2022] Open
Abstract
Liver X receptors (LXRs) contribute not only to maintain cholesterol homeostasis but also to control cell growth. However, the molecular mechanisms behind the LXR-mediated anti-proliferative effects are largely unknown. Here we show, by immunohistochemistry, that LXRα and LXRβ are differentially distributed in oral stratified squamous epithelia. By immunohistochemical and Western blot analyses, we also reveal that LXRα is abundantly expressed in human oral squamous cell carcinoma (HOSCC) tissues and cell lines. Cell counting, BrdU labeling and cell cycle assay indicated that LXR stimulation led to significant reduction of proliferation in HOSCC cells. Importantly, our study highlights, by using RNA interference, that the ATP-binding cassette transporter A1 (ABCA1)-accelerated cholesterol efflux is critical for the growth inhibitory action of LXRs in HOSCC cells. Moreover, we demonstrate that LXR activation reduces the growth of xenograft tumour of HOSCC cells in mice accompanied by the upregulation of ABCA1 expression and the decline of cholesterol levels in the tumour. These findings strongly suggested that targeting the LXR-regulated cholesterol transport, yielding in lowering intracellular cholesterol levels, could be a promising therapeutic option for certain types of cancers.
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Affiliation(s)
- Tetsuharu Kaneko
- Department of Basic Pathology, Fukushima Medical University School of Medicine, Fukushima, Japan.,Division of Dentistry and Oral Surgery, Fukushima Medical University School of Medicine, Fukushima, Japan
| | - Chihiro Kanno
- Department of Basic Pathology, Fukushima Medical University School of Medicine, Fukushima, Japan.,Division of Dentistry and Oral Surgery, Fukushima Medical University School of Medicine, Fukushima, Japan
| | - Naoki Ichikawa-Tomikawa
- Department of Basic Pathology, Fukushima Medical University School of Medicine, Fukushima, Japan
| | - Korehito Kashiwagi
- Department of Basic Pathology, Fukushima Medical University School of Medicine, Fukushima, Japan
| | - Nanae Yaginuma
- Department of Basic Pathology, Fukushima Medical University School of Medicine, Fukushima, Japan
| | - Chihiro Ohkoshi
- Department of Basic Pathology, Fukushima Medical University School of Medicine, Fukushima, Japan
| | - Mizuko Tanaka
- Department of Basic Pathology, Fukushima Medical University School of Medicine, Fukushima, Japan
| | - Takashi Sugino
- Department of Diagnostic Pathology, Shizuoka Cancer Center, Shizuoka, Japan
| | - Tetsuya Imura
- Department of Basic Pathology, Fukushima Medical University School of Medicine, Fukushima, Japan
| | - Hiroshi Hasegawa
- Division of Dentistry and Oral Surgery, Fukushima Medical University School of Medicine, Fukushima, Japan
| | - Hideki Chiba
- Department of Basic Pathology, Fukushima Medical University School of Medicine, Fukushima, Japan
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Cornejo MP, Hentges ST, Maliqueo M, Coirini H, Becu-Villalobos D, Elias CF. Neuroendocrine Regulation of Metabolism. J Neuroendocrinol 2016; 28:10.1111/jne.12395. [PMID: 27114114 PMCID: PMC4956544 DOI: 10.1111/jne.12395] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Revised: 03/31/2016] [Accepted: 04/21/2016] [Indexed: 12/29/2022]
Abstract
Given the current environment in most developed countries, it is a challenge to maintain a good balance between calories consumed and calories burned, although maintenance of metabolic balance is key to good health. Therefore, understanding how metabolic regulation is achieved and how the dysregulation of metabolism affects health is an area of intense research. Most studies focus on the hypothalamus, which is a brain area that acts as a key regulator of metabolism. Among the nuclei that comprise the hypothalamus, the arcuate nucleus is one of the major mediators in the regulation of food intake. The regulation of energy balance is also a key factor ensuring the maintenance of any species as a result of the dependence of reproduction on energy stores. Adequate levels of energy reserves are necessary for the proper functioning of the hypothalamic-pituitary-gonadal axis. This review discusses valuable data presented in the 2015 edition of the International Workshop of Neuroendocrinology concerning the fundamental nature of the hormonal regulation of the hypothalamus and the impact on energy balance and reproduction.
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Affiliation(s)
- Maria P. Cornejo
- Laboratory of Neurophysiology, Multidisciplinary Institute of Cell Biology [IMBICE, dependent on the Argentine Research Council (CONICET), Scientific Research Commission, Province of Buenos Aires (CIC-PBA) and National University of La Plata (UNLP)], La Plata, Argentina
| | - Shane T. Hentges
- Department of Biomedical Sciences, Colorado State University, Fort Collins, Colorado, USA
| | - Manuel Maliqueo
- Endocrinology and Metabolism Laboratory, Department of Medicine West Division, School of Medicine University of Chile, Santiago de Chile, Chile
| | - Hector Coirini
- Laboratory of Neurobiology, Institute of Biology and Experimental Medicine [(IBYME), dependent on CONICET] and Department of Human Biochemistry, University of Buenos Aires, Buenos Aires, Argentina
| | - Damasia Becu-Villalobos
- Laboratory of Pituitary Regulation, Institute of Biology and Experimental Medicine [(IBYME), dependent on CONICET], Buenos Aires, Argentina
| | - Carol F. Elias
- Molecular and Integrative Physiology, University of Michigan, Ann Arbor, Michigan, USA
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Zhao C, Castonguay TW. Effects of free access to sugar solutions on the control of energy intake. FOOD REVIEWS INTERNATIONAL 2016. [DOI: 10.1080/87559129.2016.1149863] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Changhui Zhao
- Department of Nutrition and Food Science, University of Maryland, College Park, Maryland, USA
| | - Thomas W. Castonguay
- Department of Nutrition and Food Science, University of Maryland, College Park, Maryland, USA
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Dietary sugars: their detection by the gut-brain axis and their peripheral and central effects in health and diseases. Eur J Nutr 2014; 54:1-24. [PMID: 25296886 PMCID: PMC4303703 DOI: 10.1007/s00394-014-0776-y] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2014] [Accepted: 09/24/2014] [Indexed: 12/25/2022]
Abstract
Background Substantial increases in dietary sugar intake together with the increasing prevalence of obesity worldwide, as well as the parallels found between sugar overconsumption and drug abuse, have motivated research on the adverse effects of sugars on health and eating behaviour. Given that the gut–brain axis depends on multiple interactions between peripheral and central signals, and because these signals are interdependent, it is crucial to have a holistic view about dietary sugar effects on health. Methods Recent data on the effects of dietary sugars (i.e. sucrose, glucose, and fructose) at both peripheral and central levels and their interactions will be critically discussed in order to improve our understanding of the effects of sugars on health and diseases. This will contribute to the development of more efficient strategies for the prevention and treatment for obesity and associated co-morbidities. Results This review highlights opposing effects of glucose and fructose on metabolism and eating behaviour. Peripheral glucose and fructose sensing may influence eating behaviour by sweet-tasting mechanisms in the mouth and gut, and by glucose-sensing mechanisms in the gut. Glucose may impact brain reward regions and eating behaviour directly by crossing the blood–brain barrier, and indirectly by peripheral neural input and by oral and intestinal sweet taste/sugar-sensing mechanisms, whereas those promoted by fructose orally ingested seem to rely only on these indirect mechanisms. Conclusions Given the discrepancies between studies regarding the metabolic effects of sugars, more studies using physiological experimental conditions and in animal models closer to humans are needed. Additional studies directly comparing the effects of sucrose, glucose, and fructose should be performed to elucidate possible differences between these sugars on the reward circuitry.
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Kruse MS, Vega MC, Rey M, Coirini H. Sex differences in LXR expression in normal offspring and in rats born to diabetic dams. J Endocrinol 2014; 222:53-60. [PMID: 24824431 DOI: 10.1530/joe-14-0054] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Gestational diabetes (GD) alters normal fetal development and is related to a diabetogenic effect in the progeny. Liver X receptors (LXRs) are considered to be potential drug targets for the regulation, treatment, or prevention of diabetes. The aim of this study was to evaluate early and late changes of LXR in the hippocampus and hypothalamus of the male and female offspring of control (CO) and diabetic (DO) mothers. We used an experimental model of streptozotocin-induced GD to assess the protein expression of LXRα (NR1H3) and LXRβ (NR1H2) by western blotting. The tissues were obtained from CO and DO animals at postnatal day 1 (1D), day 10 (10D), and day 35 (35D) and 9 months (9M). In CO, the LXR expression showed significant differences among the groups, which were tissue- and receptor-specific (P<0.05). Sex differences in CO were found only in the hypothalamus for LXRβ expression at 35D and 9M (P<0.05). When CO and DO were compared, differences between them were observed in the majority of the studied groups at 1D (male hippocampus, LXRα 31% and LXRβ 161%; female hippocampus, LXRβ 165%; male hypothalamus, LXRβ 182%; and female hypothalamus, LXRα 85%; P<0.05). However, these differences disappeared later with the exception of LXRβ expression in the male hypothalamus (P<0.05). The area under the curve during the glucose tolerance test correlated negatively with LXRβ in CO but not in DO animals. Moreover, in a male DO subpopulation this correlation was positive as it occurs in intolerant animals. These results indicate that GD affects hypothalamic LXR expression differently in male and female offspring.
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Affiliation(s)
- María Sol Kruse
- Laboratorio de NeurobiologíaInstituto de Biología y Medicina Experimental (IByME-CONICET), Vuelta de Obligado 2490, C1428ADN Ciudad Autónoma de Buenos Aires, ArgentinaDepartamento de Bioquímica HumanaFacultad de Medicina, Universidad de Buenos Aires, Paraguay 2155, 5to Piso, C1121ABG Ciudad Autónoma de Buenos Aires, ArgentinaFacultad de Ciencias MedicasUniversidad Católica de Cuyo, Rivadavia, Provincia de San Juan, Argentina
| | - María Cristina Vega
- Laboratorio de NeurobiologíaInstituto de Biología y Medicina Experimental (IByME-CONICET), Vuelta de Obligado 2490, C1428ADN Ciudad Autónoma de Buenos Aires, ArgentinaDepartamento de Bioquímica HumanaFacultad de Medicina, Universidad de Buenos Aires, Paraguay 2155, 5to Piso, C1121ABG Ciudad Autónoma de Buenos Aires, ArgentinaFacultad de Ciencias MedicasUniversidad Católica de Cuyo, Rivadavia, Provincia de San Juan, Argentina
| | - Mariana Rey
- Laboratorio de NeurobiologíaInstituto de Biología y Medicina Experimental (IByME-CONICET), Vuelta de Obligado 2490, C1428ADN Ciudad Autónoma de Buenos Aires, ArgentinaDepartamento de Bioquímica HumanaFacultad de Medicina, Universidad de Buenos Aires, Paraguay 2155, 5to Piso, C1121ABG Ciudad Autónoma de Buenos Aires, ArgentinaFacultad de Ciencias MedicasUniversidad Católica de Cuyo, Rivadavia, Provincia de San Juan, Argentina
| | - Héctor Coirini
- Laboratorio de NeurobiologíaInstituto de Biología y Medicina Experimental (IByME-CONICET), Vuelta de Obligado 2490, C1428ADN Ciudad Autónoma de Buenos Aires, ArgentinaDepartamento de Bioquímica HumanaFacultad de Medicina, Universidad de Buenos Aires, Paraguay 2155, 5to Piso, C1121ABG Ciudad Autónoma de Buenos Aires, ArgentinaFacultad de Ciencias MedicasUniversidad Católica de Cuyo, Rivadavia, Provincia de San Juan, ArgentinaLaboratorio de NeurobiologíaInstituto de Biología y Medicina Experimental (IByME-CONICET), Vuelta de Obligado 2490, C1428ADN Ciudad Autónoma de Buenos Aires, ArgentinaDepartamento de Bioquímica HumanaFacultad de Medicina, Universidad de Buenos Aires, Paraguay 2155, 5to Piso, C1121ABG Ciudad Autónoma de Buenos Aires, ArgentinaFacultad de Ciencias MedicasUniversidad Católica de Cuyo, Rivadavia, Provincia de San Juan, ArgentinaLaboratorio de NeurobiologíaInstituto de Biología y Medicina Experimental (IByME-CONICET), Vuelta de Obligado 2490, C1428ADN Ciudad Autónoma de Buenos Aires, ArgentinaDepartamento de Bioquímica HumanaFacultad de Medicina, Universidad de Buenos Aires, Paraguay 2155, 5to Piso, C1121ABG Ciudad Autónoma de Buenos Aires, ArgentinaFacultad de Ciencias MedicasUniversidad Católica de Cuyo, Rivadavia, Provincia de San Juan, Argentina
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Cermenati G, Brioschi E, Abbiati F, Melcangi RC, Caruso D, Mitro N. Liver X receptors, nervous system, and lipid metabolism. J Endocrinol Invest 2013; 36:435-43. [PMID: 23609963 DOI: 10.3275/8941] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Lipids in the nervous system are represented by cholesterol and phospholipids as constituents of cell membranes and, in particular, of myelin. Therefore, lipids are finely regulated to guarantee physiological functions. In the central nervous system, cholesterol is locally synthesized due to the presence of the blood brain barrier. In the peripheral nervous system cholesterol is either up-taken by lipoproteins and/or produced by de novo biosynthesis. Defects in lipid homeostasis in these tissues lead to structural and functional changes that often result in different pathological conditions depending on the affected pathways (i.e. cholesterol biosynthesis, cholesterol efflux, fatty acid biosynthesis etc.). Alterations in cholesterol metabolism in the central nervous system are linked to several disorders such as Alzheimer's disease, Huntington disease, Parkinson disease, Multiple sclerosis, Smith-Lemli-Opitz syndrome, Niemann-Pick type C disease, and glioblastoma. In the peripheral nervous system changes in lipid metabolism are associated with the development of peripheral neuropathy that may be caused by metabolic disorders, injuries, therapeutics, and autoimmune diseases. Transcription factors, such as the Liver X receptors (LXR), regulate both cholesterol and fatty acid metabolism in several tissues including the nervous system. In the last few years several studies elucidated the biology of LXR in the nervous system due to the availability of knock-out mice and the development of synthetic ligands. Here, we review a survey of the literature focused on the central and peripheral nervous system and in physiological and pathological settings with particular attention to the roles played by LXR in both districts.
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Affiliation(s)
- G Cermenati
- Department of Pharmacological and Biomolecular Sciences, University of Milan, Via Balzaretti 9, Milan, Italy
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