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English J, Orofino J, Cederquist CT, Paul I, Li H, Auwerx J, Emili A, Belkina A, Cardamone D, Perissi V. GPS2-mediated regulation of the adipocyte secretome modulates adipose tissue remodeling at the onset of diet-induced obesity. Mol Metab 2023; 69:101682. [PMID: 36731652 PMCID: PMC9922684 DOI: 10.1016/j.molmet.2023.101682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/26/2022] [Accepted: 01/22/2023] [Indexed: 02/01/2023] Open
Abstract
OBJECTIVE Dysfunctional, unhealthy expansion of white adipose tissue due to excess dietary intake is a process at the root of obesity and Type 2 Diabetes development. The objective of this study is to contribute to a better understanding of the underlying mechanism(s) regulating the early stages of adipose tissue expansion and adaptation to dietary stress due to an acute, high-fat diet (HFD) challenge, with a focus on the communication between adipocytes and other stromal cells. METHODS We profiled the early response to high-fat diet exposure in wildtype and adipocyte-specific GPS2-KO (GPS2-AKO) mice at the cellular, tissue and organismal level. A multi-pronged approach was employed to disentangle the complex cellular interactions dictating tissue remodeling, via single-cell RNA sequencing and FACS profiling of the stromal fraction, and semi-quantitative proteomics of the adipocyte-derived exosomal cargo after 5 weeks of HFD feeding. RESULTS Our results indicate that loss of GPS2 in mature adipocytes leads to impaired adaptation to the metabolic stress imposed by HFD feeding. GPS2-AKO mice are significantly more inflamed, insulin resistant, and obese, compared to the WT counterparts. At the cellular level, lack of GPS2 in adipocytes impacts upon other stromal populations, with both the eWAT and scWAT depots exhibiting changes in the immune and non-immune compartments that contribute to an increase in inflammatory and anti-adipogenic cell types. Our studies also revealed that adipocyte to stromal cell communication is facilitated by exosomes, and that transcriptional rewiring of the exosomal cargo is crucial for tissue remodeling. Loss of GPS2 results in increased expression of secreted factors promoting a TGFβ-driven fibrotic microenvironment favoring unhealthy tissue remodeling and expansion. CONCLUSIONS Adipocytes serve as an intercellular signaling hub, communicating with the stromal compartment via paracrine signaling. Our study highlights the importance of proper regulation of the 'secretome' released by energetically stressed adipocytes at the onset of obesity. Altered transcriptional regulation of factors secreted via adipocyte-derived exosomes (AdExos), in the absence of GPS2, contributes to the establishment of an anti-adipogenic, pro-fibrotic adipose tissue environment, and to hastened progression towards a metabolically dysfunctional phenotype.
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Affiliation(s)
- Justin English
- Department of Biochemistry, Boston University School of Medicine, Boston, MA, USA; Department of Pharmacology and Experimental Therapeutics, Boston University School of Medicine, Boston, MA, USA.
| | - Joseph Orofino
- Department of Biochemistry, Boston University School of Medicine, Boston, MA, USA.
| | - Carly T. Cederquist
- Department of Biochemistry, Boston University School of Medicine, Boston, MA, USA
| | - Indranil Paul
- Department of Biochemistry, Boston University School of Medicine, Boston, MA, USA; Center for Network Systems Biology, Boston University, Boston, MA, USA.
| | - Hao Li
- Laboratory of Integrative Systems Physiology, Interfaculty Institute of Bioengineering, Ecole Polytechnique Federale de Lausanne, Lausanne, Switzerland.
| | - Johan Auwerx
- Laboratory of Integrative Systems Physiology, Interfaculty Institute of Bioengineering, Ecole Polytechnique Federale de Lausanne, Lausanne, Switzerland.
| | - Andrew Emili
- Department of Biochemistry, Boston University School of Medicine, Boston, MA, USA; Center for Network Systems Biology, Boston University, Boston, MA, USA.
| | - Anna Belkina
- Flow Cytometry Core Facility, Boston University School of Medicine, Boston, MA, USA; Department of Pathology and Laboratory Medicine, Boston University School of Medicine, Boston, MA, USA.
| | - Dafne Cardamone
- Department of Biochemistry, Boston University School of Medicine, Boston, MA, USA.
| | - Valentina Perissi
- Department of Biochemistry, Boston University School of Medicine, Boston, MA, USA; School of Life Science, Northwestern Polytechnical University, Xi'an 710072, China.
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Alquier T, Christian-Hinman CA, Alfonso J, Færgeman NJ. From benzodiazepines to fatty acids and beyond: revisiting the role of ACBP/DBI. Trends Endocrinol Metab 2021; 32:890-903. [PMID: 34565656 PMCID: PMC8785413 DOI: 10.1016/j.tem.2021.08.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Revised: 08/29/2021] [Accepted: 08/30/2021] [Indexed: 01/19/2023]
Abstract
Four decades ago Costa and colleagues identified a small, secreted polypeptide in the brain that can displace the benzodiazepine diazepam from the GABAA receptor, and was thus termed diazepam binding inhibitor (DBI). Shortly after, an identical polypeptide was identified in liver by its ability to induce termination of fatty acid synthesis, and was named acyl-CoA binding protein (ACBP). Since then, ACBP/DBI has been studied in parallel without a clear and integrated understanding of its dual roles. The first genetic loss-of-function models have revived the field, allowing targeted approaches to better understand the physiological roles of ACBP/DBI in vivo. We discuss the roles of ACBP/DBI in central and tissue-specific functions in mammals, with an emphasis on metabolism and mechanisms of action.
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Affiliation(s)
- Thierry Alquier
- Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montreal Diabetes Research Center, and Departments of Medicine, Pharmacology and Physiology, Biochemistry, and Neurosciences, Université de Montréal, Montreal, QC, Canada.
| | - Catherine A Christian-Hinman
- Department of Molecular and Integrative Physiology, Neuroscience Program, Beckman Institute for Advanced Science and Technology, University of Illinois Urbana-Champaign, Urbana, IL 61801, USA
| | - Julieta Alfonso
- Department of Clinical Neurobiology, University Hospital Heidelberg and German Cancer Research Center (DKFZ), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany
| | - Nils J Færgeman
- Department of Biochemistry and Molecular Biology, Villum Center for Bioanalytical Sciences, University of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmark.
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Díaz M, Blasco-Roset A, Villarroya J, López-Bermejo A, de Zegher F, Villarroya F, Ibáñez L. Circulating diazepam-binding inhibitor in infancy: Relation to markers of adiposity and metabolic health. Pediatr Obes 2021; 16:e12802. [PMID: 34014038 DOI: 10.1111/ijpo.12802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Revised: 04/11/2021] [Accepted: 04/26/2021] [Indexed: 11/30/2022]
Abstract
BACKGROUND Diazepam-binding inhibitor (DBI) controls feeding behaviour and glucose homeostasis. Individuals born small-for-gestational-age (SGA) with excessive postnatal catch-up in weight are at risk for obesity and type 2 diabetes. OBJECTIVE To assess serum concentrations of DBI (0-2 years) in appropriate-for-gestational-age (AGA, n = 70) vs SGA infants (n = 33) with spontaneous catch-up and their relationship with endocrine-metabolic and adiposity markers. METHODS Longitudinal assessments included auxology, fasting glucose, insulin, insulin-like growth factor, high-molecular-weight adiponectin, DBI and body composition (absorptiometry). DBI was measured cross-sectionally in pregnant and non-pregnant women and in 2-day-old newborns. DBI mRNA expression levels were assessed in adult and neonatal tissues. RESULTS Cord blood DBI concentrations were similar in AGA and SGA newborns and about fivefold higher than those in women. Serum DBI levels decreased by age 2 days, were higher in SGA vs AGA infants at age 2 years and associated negatively with markers of adiposity and insulin resistance and positively with high-molecular-weight adiponectin. DBI mRNA expression was lower in placenta than in other tissues. CONCLUSION The increased DBI concentrations at birth are unrelated to prenatal growth. The higher DBI levels in SGA subjects at age 2 years may be related to catch-up growth or represent an adaptive mechanism to promote lipogenesis.
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Affiliation(s)
- Marta Díaz
- Endocrinology Department, Pediatric Research Institute Hospital Sant Joan de Déu, University of Barcelona, Barcelona, Spain.,Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), ISCIII, Madrid, Spain
| | - Albert Blasco-Roset
- Biochemistry and Molecular Biomedicine, Institute of Biomedicine, University of Barcelona & Pediatric Research Institute Hospital Sant Joan de Déu, Barcelona, Spain.,Centro de Investigación Biomédica en Red de Fisiopatología de la Obesidad y Nutrición (CIBEROBN), ISCIII, Madrid, Spain
| | - Joan Villarroya
- Biochemistry and Molecular Biomedicine, Institute of Biomedicine, University of Barcelona & Pediatric Research Institute Hospital Sant Joan de Déu, Barcelona, Spain.,Centro de Investigación Biomédica en Red de Fisiopatología de la Obesidad y Nutrición (CIBEROBN), ISCIII, Madrid, Spain
| | - Abel López-Bermejo
- Pediatric Endocrinology Research Group, Girona Institute for Biomedical Research (IDIBGI) and Dr. Josep Trueta Hospital, Girona, Spain
| | - Francis de Zegher
- Department of Development & Regeneration, University of Leuven, Leuven, Belgium
| | - Francesc Villarroya
- Biochemistry and Molecular Biomedicine, Institute of Biomedicine, University of Barcelona & Pediatric Research Institute Hospital Sant Joan de Déu, Barcelona, Spain.,Centro de Investigación Biomédica en Red de Fisiopatología de la Obesidad y Nutrición (CIBEROBN), ISCIII, Madrid, Spain
| | - Lourdes Ibáñez
- Endocrinology Department, Pediatric Research Institute Hospital Sant Joan de Déu, University of Barcelona, Barcelona, Spain.,Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), ISCIII, Madrid, Spain
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Ma J, Mahfuz S, Wang J, Piao X. Effect of Dietary Supplementation With Mixed Organic Acids on Immune Function, Antioxidative Characteristics, Digestive Enzymes Activity, and Intestinal Health in Broiler Chickens. Front Nutr 2021; 8:673316. [PMID: 34422878 PMCID: PMC8374430 DOI: 10.3389/fnut.2021.673316] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Accepted: 05/06/2021] [Indexed: 12/12/2022] Open
Abstract
The purpose of this study was to explore the effect of dietary supplementation with mixed organic acids on intestinal health, enzyme activity, and antioxidative characteristics in broilers. A total of 192 1-day-old chicks were evenly allocated to three experimental groups with eight replicates, a basal diet with 0 (Control), 3,000 mg/kg (LMOA), 6,000 mg/kg (HMOA) mixed organic acid. The tissue and serum samples were gathered on 21 and 42 d of the experiment. An increased (P < 0.05) concentration of IgA, D-lactate (D-LA), and interleukin-10 (IL-10) in the serum of broilers diets with HMOA was observed. The levels of total antioxidant capacity (T-AOC) and catalase activity (CAT) in serum were enhanced (P < 0.05) with dietary and mixed organic acid, respectively, and increased (P < 0.05) content of superoxide dismutase (SOD) and CAT in the duodenum of broilers diets with LMOA was noticed. Also, LMOA decreased (P < 0.05) the pH value of the duodenum and enhanced (P < 0.05) the amylase activity of the pancreas, the tight junction protein (mainly Claudin-1, Claudin-2, and ZO-1) in the duodenum of broilers fed with mixed organic acid were promoted (P < 0.05), and the LMOA group performed better in the small intestine. In cecum microbiota, LMOA and HMOA modulated the structure of microbiota and mainly reduced the relative abundance of Escherichia coli. In brief, dietary supplemented mixed organic acid improved the health status of broilers by promoting the immune function, enhancing the antioxidative characteristics and tight junction proteins expression as well as cecum microbiota. However, LMOA groups may be a better fit considering the comprehensive effects of experiments and economic costs.
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Affiliation(s)
| | | | | | - Xiangshu Piao
- State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, China
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Lebrun B, Barbot M, Tonon MC, Prévot V, Leprince J, Troadec JD. Glial endozepines and energy balance: Old peptides with new tricks. Glia 2020; 69:1079-1093. [PMID: 33105065 DOI: 10.1002/glia.23927] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Revised: 10/09/2020] [Accepted: 10/09/2020] [Indexed: 12/12/2022]
Abstract
The contribution of neuroglial interactions to the regulation of energy balance has gained increasing acceptance in recent years. In this context, endozepines, endogenous analogs of benzodiazepine derived from diazepam-binding inhibitor, are now emerging as major players. Produced by glial cells (astrocytes and tanycytes), endozepines have been known for two decades to exert potent anorexigenic effects by acting at the hypothalamic level. However, it is only recently that their modes of action, including the mechanisms by which they modulate energy metabolism, have begun to be elucidated. The data available today are abundant, significant, and sometimes contradictory, revealing a much more complex regulation than initially expected. Several mechanisms of action of endozepines seem to coexist at the central level, particularly in the hypothalamus. The brainstem has also recently emerged as a potential site of action for endozepines. In addition to their central anorexigenic effects, endozepines may also display peripheral effects promoting orexigenic actions, adding to their complexity and raising yet more questions. In this review, we attempt to provide an overview of our current knowledge in this rapidly evolving field and to pinpoint questions that remain unanswered.
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Affiliation(s)
- Bruno Lebrun
- CNRS 7291, Laboratoire de Neurosciences Cognitives, Aix Marseille University, Marseille, France
| | - Manon Barbot
- CNRS 7291, Laboratoire de Neurosciences Cognitives, Aix Marseille University, Marseille, France
| | - Marie-Christine Tonon
- INSERM U1239, Laboratoire de Différenciation et Communication Neuronale et Neuroendocrine, Normandie Université, Rouen, France
| | - Vincent Prévot
- University of Lille, INSERM, CHU Lille, Development and Plasticity of the Neuroendocrine Brain, Lille Neuroscience and Cognition, UMR-S 1172, European Genomic Institute of Diabetes (EGID), Lille, France
| | - Jérôme Leprince
- INSERM U1239, Laboratoire de Différenciation et Communication Neuronale et Neuroendocrine, Normandie Université, Rouen, France
| | - Jean-Denis Troadec
- CNRS 7291, Laboratoire de Neurosciences Cognitives, Aix Marseille University, Marseille, France
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Tonon MC, Vaudry H, Chuquet J, Guillebaud F, Fan J, Masmoudi-Kouki O, Vaudry D, Lanfray D, Morin F, Prevot V, Papadopoulos V, Troadec JD, Leprince J. Endozepines and their receptors: Structure, functions and pathophysiological significance. Pharmacol Ther 2020; 208:107386. [DOI: 10.1016/j.pharmthera.2019.06.008] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Accepted: 06/20/2019] [Indexed: 02/06/2023]
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Li Y. Synaptic Plasticity and Synchrony in the Anterior Cingulate Cortex Circuitry: A Neural Network Approach to Causality of Chronic Visceral Pain and Associated Cognitive Deficits. ADVANCES IN NEUROBIOLOGY 2018; 21:219-245. [PMID: 30334224 DOI: 10.1007/978-3-319-94593-4_8] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Human brain imaging studies have demonstrated the importance of cortical neuronal networks in the perception of pain in patients with functional bowel disease such as irritable bowel syndrome (IBS).Studies have identified an enhanced response in the anterior cingulate cortex (ACC) to colorectal distension in viscerally hypersensitive (VH) rats. Electrophysiological recordings show long-lasting potentiation of local field potential (LFP) in the medial thalamus (MT)-ACC synapses in VH rats. Theta burst stimulation in the MT reliably induced long-term potentiation (LTP) in the MT-ACC pathway in normal rats, but was occluded in the VH state. Further, repeated tetanization of MT increased ACC neuronal activity and visceral pain responses of normal rats, mimicking VH rats. These data provide conclusive evidence that chronic visceral pain is associated with alterations of synaptic plasticity in the ACC circuitry. The ACC synaptic strengthening may engage signal transduction pathways that are in common with those activated by electrical stimulation, and serve as an attractive cellular model of functional visceral pain.Evidences have shown that most patients with IBS have psychiatric comorbidity. Using rat gambling task (RGT), we discovered an impairment of decision-making behavior in VH rats. Electrophysiological study showed a reduction of LTP in the basolateral amygdala (BLA)-ACC synapses in VH rats. Multiple-electrode array recordings of local field potential (LFP) in freely behaving rats revealed that chronic visceral pain led to disruption of ACC spike timing and BLA local theta oscillation. Finally, cross-correlation analysis revealed that VH was associated with suppressed synchronization of theta oscillation between the BLA and ACC, indicating reduced neuronal communications between these two regions. These data suggest that functional disturbances in BLA-ACC neural circuitry may be relevant causes for the deficits in decision-making in chronic pain state.The viscero-sensation is a faculty of perception that does not depend upon any outward sense, but acts to influence the elicited behavioral response. Clinically, vagus nerve stimulation (VNS) has shown several beneficial effects for mood enhancement. Our recent study characterized that VNS facilitates decision-making and unveiled several important roles for VNS in regulating LFP and spike phases, as well as enhancing spike-phase coherence between key brain areas involved in cognitive performance.It is conceivable that the visceral pain experience may be better explained as a biopsychosocial model of pain and reflected in a matrix of neuronal structures. Understanding of desynchrony in the ACC network and cognitive deficits is likely to provide exciting and powerful future treatment for chronic visceral pain related debilitating mood, anxiety, and cognitive disorders.
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Affiliation(s)
- Ying Li
- Department of Biomedical Sciences, City University of Hong Kong, Kowloon, Hong Kong. .,Centre for Biosystems, Neuroscience, and Nanotechnology, City University of Hong Kong, Kowloon, Hong Kong. .,School of Veterinary Medicine, City University of Hong Kong, Kowloon, Hong Kong.
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Cao B, Wang J, Shahed M, Jelfs B, Chan RHM, Li Y. Vagus Nerve Stimulation Alters Phase Synchrony of the Anterior Cingulate Cortex and Facilitates Decision Making in Rats. Sci Rep 2016; 6:35135. [PMID: 27731403 PMCID: PMC5059720 DOI: 10.1038/srep35135] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Accepted: 09/26/2016] [Indexed: 11/09/2022] Open
Abstract
Vagus nerve stimulation (VNS) can enhance memory and cognitive functions in both rats and humans. Studies have shown that VNS influenced decision-making in epileptic patients. However, the sites of action involved in the cognitive-enhancement are poorly understood. By employing a conscious rat model equipped with vagus nerve cuff electrode, we assess the role of chronic VNS on decision-making in rat gambling task (RGT). Simultaneous multichannel-recordings offer an ideal setup to test the hypothesis that VNS may induce alterations of in both spike-field-coherence and synchronization of theta oscillations across brain areas in the anterior cingulate cortex (ACC) and basolateral amygdala (BLA). Daily VNS, administered immediately following training sessions of RGT, caused an increase in 'good decision-maker' rats. Neural spikes in the ACC became synchronized with the ongoing theta oscillations of local field potential (LFP) in BLA following VNS. Moreover, cross-correlation analysis revealed synchronization between the ACC and BLA. Our results provide specific evidence that VNS facilitates decision-making and unveils several important roles for VNS in regulating LFP and spike phases, as well as enhancing spike-phase coherence between key brain areas involved in cognitive performance. These data may serve to provide fundamental notions regarding neurophysiological biomarkers for therapeutic VNS in cognitive impairment.
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Affiliation(s)
- Bing Cao
- Department of Biomedical Sciences, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
- Centre for Biosystems, Neuroscience, and Nanotechnology, City University of Hong Kong, Kowloon, Hong Kong
| | - Jun Wang
- Department of Biomedical Sciences, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
- Centre for Biosystems, Neuroscience, and Nanotechnology, City University of Hong Kong, Kowloon, Hong Kong
| | - Mahadi Shahed
- Department of Biomedical Sciences, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
- Centre for Biosystems, Neuroscience, and Nanotechnology, City University of Hong Kong, Kowloon, Hong Kong
| | - Beth Jelfs
- Centre for Biosystems, Neuroscience, and Nanotechnology, City University of Hong Kong, Kowloon, Hong Kong
- Department of Electronic Engineering, City University of Hong Kong, Kowloon, Hong Kong
| | - Rosa H. M. Chan
- Centre for Biosystems, Neuroscience, and Nanotechnology, City University of Hong Kong, Kowloon, Hong Kong
- Department of Electronic Engineering, City University of Hong Kong, Kowloon, Hong Kong
| | - Ying Li
- Department of Biomedical Sciences, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
- Centre for Biosystems, Neuroscience, and Nanotechnology, City University of Hong Kong, Kowloon, Hong Kong
- Shenzhen Key Lab of Neuropsychiatric Modulation, CAS Center for Excellence in Brain Science, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, Hong Kong
- School of Veterinary Medicine, City University of Hong Kong, Kowloon, Hong Kong
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Palamidi I, Fegeros K, Mohnl M, Abdelrahman W, Schatzmayr G, Theodoropoulos G, Mountzouris K. Probiotic form effects on growth performance, digestive function, and immune related biomarkers in broilers. Poult Sci 2016; 95:1598-1608. [DOI: 10.3382/ps/pew052] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Accepted: 01/26/2016] [Indexed: 01/02/2023] Open
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Siejka A, Jankiewicz-Wika J, Stępień H, Fryczak J, Świętosławski J, Komorowski J. Reduced plasma level of diazepam-binding inhibitor (DBI) in patients with morbid obesity. Endocrine 2015; 49:859-62. [PMID: 25561371 PMCID: PMC4512568 DOI: 10.1007/s12020-014-0522-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/21/2014] [Accepted: 12/16/2014] [Indexed: 11/26/2022]
Affiliation(s)
- Agnieszka Siejka
- Department of Clinical Endocrinology, Medical University of Lodz, ul. Sterlinga 3, 91-425 Lodz, Poland
| | - Joanna Jankiewicz-Wika
- Department of Clinical Endocrinology, Medical University of Lodz, ul. Sterlinga 3, 91-425 Lodz, Poland
| | - Henryk Stępień
- Department of Immunoendocrinology, Medical University of Lodz, ul. Sterlinga 3, 91-425, Lodz, Poland
| | - Jolanta Fryczak
- Department of Immunoendocrinology, Medical University of Lodz, ul. Sterlinga 3, 91-425, Lodz, Poland
| | - Jacek Świętosławski
- Department of Neuroendocrinology, Medical University of Lodz, ul. Sterlinga 3, 91-425 Lodz, Poland
| | - Jan Komorowski
- Department of Clinical Endocrinology, Medical University of Lodz, ul. Sterlinga 3, 91-425 Lodz, Poland
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Neess D, Bek S, Engelsby H, Gallego SF, Færgeman NJ. Long-chain acyl-CoA esters in metabolism and signaling: Role of acyl-CoA binding proteins. Prog Lipid Res 2015; 59:1-25. [PMID: 25898985 DOI: 10.1016/j.plipres.2015.04.001] [Citation(s) in RCA: 115] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Revised: 03/11/2015] [Accepted: 04/09/2015] [Indexed: 02/03/2023]
Abstract
Long-chain fatty acyl-CoA esters are key intermediates in numerous lipid metabolic pathways, and recognized as important cellular signaling molecules. The intracellular flux and regulatory properties of acyl-CoA esters have been proposed to be coordinated by acyl-CoA-binding domain containing proteins (ACBDs). The ACBDs, which comprise a highly conserved multigene family of intracellular lipid-binding proteins, are found in all eukaryotes and ubiquitously expressed in all metazoan tissues, with distinct expression patterns for individual ACBDs. The ACBDs are involved in numerous intracellular processes including fatty acid-, glycerolipid- and glycerophospholipid biosynthesis, β-oxidation, cellular differentiation and proliferation as well as in the regulation of numerous enzyme activities. Little is known about the specific roles of the ACBDs in the regulation of these processes, however, recent studies have gained further insights into their in vivo functions and provided further evidence for ACBD-specific functions in cellular signaling and lipid metabolic pathways. This review summarizes the structural and functional properties of the various ACBDs, with special emphasis on the function of ACBD1, commonly known as ACBP.
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Affiliation(s)
- Ditte Neess
- Villum Center for Bioanalytical Sciences, Department of Biochemistry and Molecular Biology, University of Southern Denmark, DK-5230 Odense M, Denmark
| | - Signe Bek
- Villum Center for Bioanalytical Sciences, Department of Biochemistry and Molecular Biology, University of Southern Denmark, DK-5230 Odense M, Denmark
| | - Hanne Engelsby
- Villum Center for Bioanalytical Sciences, Department of Biochemistry and Molecular Biology, University of Southern Denmark, DK-5230 Odense M, Denmark
| | - Sandra F Gallego
- Villum Center for Bioanalytical Sciences, Department of Biochemistry and Molecular Biology, University of Southern Denmark, DK-5230 Odense M, Denmark
| | - Nils J Færgeman
- Villum Center for Bioanalytical Sciences, Department of Biochemistry and Molecular Biology, University of Southern Denmark, DK-5230 Odense M, Denmark.
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Clavier T, Tonon MC, Foutel A, Besnier E, Lefevre-Scelles A, Morin F, Gandolfo P, Tuech JJ, Quillard M, Veber B, Dureuil B, Castel H, Compère V. Increased plasma levels of endozepines, endogenous ligands of benzodiazepine receptors, during systemic inflammation: a prospective observational study. CRITICAL CARE : THE OFFICIAL JOURNAL OF THE CRITICAL CARE FORUM 2014; 18:633. [PMID: 25407756 PMCID: PMC4326502 DOI: 10.1186/s13054-014-0633-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Accepted: 10/31/2014] [Indexed: 12/30/2022]
Abstract
Introduction Recent work has shown that benzodiazepines interact with the immune system and exhibit anti-inflammatory effects. By using in vitro models, researchers in several studies have shown that the peptidergic endogenous ligands of benzodiazepine receptors, named endozepines, are involved in the immune response. All endozepines identified so far derive from diazepam-binding inhibitor (DBI), which generates several biologically active fragments. The aim of the present study was to measure plasma levels of DBI-like immunoreactivity (DBI-LI) in a rat model of sepsis and in patients with systemic inflammation from septic or non-septic origin. Methods Cecal ligation and puncture (CLP) or sham surgery was performed in rats. Blood samples were taken from animals, patients hospitalized for digestive surgery with inflammatory diseases, and healthy volunteers. Measurements of plasma DBI-related peptides were carried out by radioimmunoassay in animal and human samples. Results In the rats, CLP provoked an increase of plasma DBI-LI (+37%) 6 hours postsurgery. In humans, DBI-LI levels were significantly higher in the systemic inflammation group than in the healthy volunteer group (48.6 (32.7 to 77.7) pg/ml versus 11.1 (5.9 to 35.3) pg/ml, P < 0.001). We found a positive correlation between endozepine levels and Acute Physiology and Chronic Health Evaluation II score (rs = 0.33 (0.026 to 0.58), P < 0.05) and tumor necrosis factor α levels (rs = 0.43 (0.14 to 0.65), P < 0.01). The area under the receiver operating characteristic curve for endozepines was 0.842 (95% CI (0.717 to 0.966), P < 0.0001) for discriminating patients with inflammation from healthy volunteers. Conclusions Endozepines might be involved in the inflammatory response in patients with systemic inflammation.
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Affiliation(s)
- Thomas Clavier
- Institut National de la Santé et de la Recherche Médicale (Inserm), U982, Place Emile Blondel, 76130, Mont-Saint-Aignan, France. .,Normandy University, Institute for Research and Innovation in Biomedicine (IRIB), Place Emile Blondel, 76130, Mont-Saint-Aignan, France. .,Rouen University, Laboratory of Neuronal and Neuroendocrine Differentiation and Communication, Place Emile Blondel, 76130, Mont-Saint-Aignan, France. .,Department of Anesthesiology and Critical Care, Rouen University Hospital, Rue de Germont, 76000, Rouen, France.
| | - Marie-Christine Tonon
- Institut National de la Santé et de la Recherche Médicale (Inserm), U982, Place Emile Blondel, 76130, Mont-Saint-Aignan, France. .,Normandy University, Institute for Research and Innovation in Biomedicine (IRIB), Place Emile Blondel, 76130, Mont-Saint-Aignan, France. .,Rouen University, Laboratory of Neuronal and Neuroendocrine Differentiation and Communication, Place Emile Blondel, 76130, Mont-Saint-Aignan, France.
| | - Anne Foutel
- Department of Anesthesiology and Critical Care, Rouen University Hospital, Rue de Germont, 76000, Rouen, France.
| | - Emmanuel Besnier
- Institut National de la Santé et de la Recherche Médicale (Inserm), U982, Place Emile Blondel, 76130, Mont-Saint-Aignan, France. .,Normandy University, Institute for Research and Innovation in Biomedicine (IRIB), Place Emile Blondel, 76130, Mont-Saint-Aignan, France. .,Rouen University, Laboratory of Neuronal and Neuroendocrine Differentiation and Communication, Place Emile Blondel, 76130, Mont-Saint-Aignan, France. .,Department of Anesthesiology and Critical Care, Rouen University Hospital, Rue de Germont, 76000, Rouen, France.
| | - Antoine Lefevre-Scelles
- Department of Anesthesiology and Critical Care, Rouen University Hospital, Rue de Germont, 76000, Rouen, France.
| | - Fabrice Morin
- Institut National de la Santé et de la Recherche Médicale (Inserm), U982, Place Emile Blondel, 76130, Mont-Saint-Aignan, France. .,Normandy University, Institute for Research and Innovation in Biomedicine (IRIB), Place Emile Blondel, 76130, Mont-Saint-Aignan, France. .,Rouen University, Laboratory of Neuronal and Neuroendocrine Differentiation and Communication, Place Emile Blondel, 76130, Mont-Saint-Aignan, France.
| | - Pierrick Gandolfo
- Institut National de la Santé et de la Recherche Médicale (Inserm), U982, Place Emile Blondel, 76130, Mont-Saint-Aignan, France. .,Normandy University, Institute for Research and Innovation in Biomedicine (IRIB), Place Emile Blondel, 76130, Mont-Saint-Aignan, France. .,Rouen University, Laboratory of Neuronal and Neuroendocrine Differentiation and Communication, Place Emile Blondel, 76130, Mont-Saint-Aignan, France.
| | - Jean-Jacques Tuech
- Department of Digestive Surgery, Rouen University Hospital, Rue de Germont, 76000, Rouen, France.
| | - Muriel Quillard
- Department of Medical Biochemistry, Institute of Clinical Biology, Rouen University Hospital, 76000, Rouen, France.
| | - Benoit Veber
- Department of Anesthesiology and Critical Care, Rouen University Hospital, Rue de Germont, 76000, Rouen, France.
| | - Bertrand Dureuil
- Department of Anesthesiology and Critical Care, Rouen University Hospital, Rue de Germont, 76000, Rouen, France.
| | - Hélène Castel
- Institut National de la Santé et de la Recherche Médicale (Inserm), U982, Place Emile Blondel, 76130, Mont-Saint-Aignan, France. .,Normandy University, Institute for Research and Innovation in Biomedicine (IRIB), Place Emile Blondel, 76130, Mont-Saint-Aignan, France. .,Rouen University, Laboratory of Neuronal and Neuroendocrine Differentiation and Communication, Place Emile Blondel, 76130, Mont-Saint-Aignan, France.
| | - Vincent Compère
- Institut National de la Santé et de la Recherche Médicale (Inserm), U982, Place Emile Blondel, 76130, Mont-Saint-Aignan, France. .,Normandy University, Institute for Research and Innovation in Biomedicine (IRIB), Place Emile Blondel, 76130, Mont-Saint-Aignan, France. .,Rouen University, Laboratory of Neuronal and Neuroendocrine Differentiation and Communication, Place Emile Blondel, 76130, Mont-Saint-Aignan, France. .,Department of Anesthesiology and Critical Care, Rouen University Hospital, Rue de Germont, 76000, Rouen, France.
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Bloksgaard M, Neess D, Færgeman NJ, Mandrup S. Acyl-CoA binding protein and epidermal barrier function. Biochim Biophys Acta Mol Cell Biol Lipids 2014; 1841:369-76. [DOI: 10.1016/j.bbalip.2013.09.013] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2013] [Revised: 09/20/2013] [Accepted: 09/23/2013] [Indexed: 11/29/2022]
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Zhang X, Cao B, Yan N, Liu J, Wang J, Tung VOV, Li Y. RETRACTED: Vagus nerve stimulation modulates visceral pain-related affective memory. Behav Brain Res 2013; 236:8-15. [DOI: 10.1016/j.bbr.2012.08.027] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2012] [Revised: 07/11/2012] [Accepted: 08/16/2012] [Indexed: 12/28/2022]
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15
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Cao B, Zhang X, Yan N, Chen S, Li Y. Cholecystokinin enhances visceral pain-related affective memory via vagal afferent pathway in rats. Mol Brain 2012; 5:19. [PMID: 22681758 PMCID: PMC3407758 DOI: 10.1186/1756-6606-5-19] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2012] [Accepted: 06/09/2012] [Indexed: 11/20/2022] Open
Abstract
Background Pain contains both sensory and affective dimensions. Using a rodent visceral pain assay that combines the colorectal distension (CRD) model with the conditioned place avoidance (CPA) paradigms, we measured a learned behavior that directly reflects the affective component of visceral pain, and showed that perigenual anterior cingulate cortex (pACC) activation is critical for memory processing involved in long-term visceral affective state and prediction of aversive stimuli by contextual cue. Progress has been made and suggested that activation of vagal afferents plays a role in the behavioral control nociception and memory storage processes. In human patients, electrical vagus nerve stimulation enhanced retention of verbal learning performance. Cholecystokinin-octapeptide (CCK), which is a gastrointestinal hormone released during feeding, has been shown to enhance memory retention. Mice access to food immediately after training session enhanced memory retention. It has been well demonstrated that CCK acting on vagal afferent fibers mediates various physiological functions. We hypothesize that CCK activation of vagal afferent enhances visceral pain-related affective memory. Results In the presented study, infusion of CCK-8 at physiological concentration combining with conditional training significantly increased the CRD-induced CPA scores, and enhanced the pain affective memory retention. In contrast, CCK had no effect on CPA induced by non-nociceptive aversive stimulus (U69,593). The physiological implications were further strengthened by the similar effects observed in the rats with duodenal infusion of 5% peptone, which has been shown to induce increases in plasma CCK levels. CCK-8 receptor antagonist CR-1409 or perivagal application of capsaicin abolished the effect of CCK on aversive visceral pain memory, which was consistent with the notion that vagal afferent modulates affective aspects of visceral pain. CCK does not change the nociceptive response (visceral pain sensitivity) and anterior cingulate cortex neuronal responses to CRD. Conclusion CCK activating vagal afferent C fibers enhances memory consolidation and retention involved in long-term visceral negative affective state. Thus, in a number of gastrointestinal disorders, such as irritable bowel syndrome, nutrient content may contribute to painful visceral perception by enhancing visceral aversive memory via acts on vagal afferent pathway.
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Affiliation(s)
- Bing Cao
- Neuroscience Laboratory, Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong, China
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16
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Ludewig AH, Nitz I, Klapper M, Döring F. Identification of a novel human Acyl-CoA binding protein isoform with a unique C-terminal domain. IUBMB Life 2012; 63:547-52. [PMID: 21698759 DOI: 10.1002/iub.471] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Seven isoforms of the multifunctional human Acyl-coenzyme A binding protein (ACBP) have been characterized so far. Through ab initio analysis of expressed sequence tag (ESTs), we identified a novel high-abundant ACBP splice variant ACBP1e encoding an ACBP isoform with a unique C-terminus of 81 amino acid residues. Bioinformatic analysis shows that this domain is evolutionary conserved and shares no significant homology with other known proteins, and its function is not known. Quantitative RT-polymerase chain reaction (PCR) revealed that ACBP1e is predominantly expressed in adipose tissue and hippocampus. Protein expression studies showed perinuclear clustering of ACBP1e. These clusters were not seen in ACBP1e mutants with an altered putative subtilisin/kexin isozyme-1 cleavage site within the C-terminus, indicating that this domain is required for proper localization of ACBP1e. Conclusively, we identified a novel ACBP isoforms with an unique C-terminal domain encoded by a high-abundant splice variant.
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Affiliation(s)
- Andreas H Ludewig
- Institute of Human Nutrition and Food Science, Department of Molecular Prevention, University of Kiel, Kiel, Germany
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17
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Nitz I, Kruse ML, Klapper M, Döring F. Specific regulation of low-abundance transcript variants encoding human Acyl-CoA binding protein (ACBP) isoforms. J Cell Mol Med 2011; 15:909-27. [PMID: 20345851 PMCID: PMC3922676 DOI: 10.1111/j.1582-4934.2010.01055.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Despite intensive efforts on annotation of eukaryotic transcriptoms, little is known about the regulation of low-abundance transcripts. To address this question, we analysed the regulation of novel low-abundance transcript variants of human acyl-CoA binding protein (ACBP), an important multifunctional housekeeping protein, which we have identified by screening of human expressed sequence tags in combination with ab initio gene prediction. By using RT-, real-time RT- and rapid amplification of cDNA ends-PCR in five human tissues, we find these transcripts, which are generated by a consequent use of alternative promoters and alternate first or first two exons, to be authentic ones. They show a tissue-specific distribution and intrinsic responsiveness to glucose and insulin. Promoter analyses of the corresponding transcripts revealed a differential regulation mediated by sterol regulatory element-binding protein-2, hepatocyte nuclear factor-4α and nuclear factor κB (NF-κB), central transcription factors of fat and glucose metabolism and inflammation. Subcellular localization studies of deduced isoforms in liver HepG2 cells showed that they are distributed in different compartments. By demonstrating that ACBP is a target of NF-κB, our findings link fatty acid metabolism with inflammation. Furthermore, our findings show that low-abundance transcripts are regulated in a similar mode than their high-abundance counterparts.
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Affiliation(s)
- Inke Nitz
- Institute of Human Nutrition and Food Science, Department of Molecular Prevention, Christian-Albrechts University, Kiel, Germany
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18
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Liou AP, Chavez DI, Espero E, Hao S, Wank SA, Raybould HE. Protein hydrolysate-induced cholecystokinin secretion from enteroendocrine cells is indirectly mediated by the intestinal oligopeptide transporter PepT1. Am J Physiol Gastrointest Liver Physiol 2011; 300:G895-902. [PMID: 21311026 PMCID: PMC3094145 DOI: 10.1152/ajpgi.00521.2010] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Dietary protein is a major stimulant for cholecystokinin (CCK) secretion by the intestinal I cell, however, the mechanism by which protein is detected is unknown. Indirect functional evidence suggests that PepT1 may play a role in CCK-mediated changes in gastric motor function. However, it is unclear whether this oligopeptide transporter directly or indirectly activates the I cell. Using both the CCK-expressing enteroendocrine STC-1 cell and acutely isolated native I cells from CCK-enhanced green fluorescent protein (eGFP) mice, we aimed to determine whether PepT1 directly activates the enteroendocrine cell to elicit CCK secretion in response to oligopeptides. Both STC-1 cells and isolated CCK-eGFP cells expressed PepT1 transcripts. STC-1 cells were activated, as measured by ERK(1/2) phosphorylation, by both peptone and the PepT1 substrate Cefaclor; however, the PepT1 inhibitor 4-aminomethyl benzoic acid (AMBA) had no effect on STC-1 cell activity. The PepT1-transportable substrate glycyl-sarcosine dose-dependently decreased gastric motility in anesthetized rats but had no affect on activation of STC-1 cells or on CCK secretion by CCK-eGFP cells. CCK secretion was significantly increased in response to peptone but not to Cefaclor, cephalexin, or Phe-Ala in CCK-eGFP cells. Taken together, the data suggest that PepT1 does not directly mediate CCK secretion in response to PepT1 specific substrates. PepT1, instead, may have an indirect role in protein sensing in the intestine.
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Affiliation(s)
- Alice P. Liou
- 1Department of Anatomy, Physiology, and Cell Biology, School of Veterinary Medicine, University of California-Davis, Davis, California; and ,2Digestive Diseases Branch, National Institute of Diabetes, Digestive, and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
| | - Diana I. Chavez
- 1Department of Anatomy, Physiology, and Cell Biology, School of Veterinary Medicine, University of California-Davis, Davis, California; and
| | - Elvis Espero
- 1Department of Anatomy, Physiology, and Cell Biology, School of Veterinary Medicine, University of California-Davis, Davis, California; and
| | - Shuzhen Hao
- 1Department of Anatomy, Physiology, and Cell Biology, School of Veterinary Medicine, University of California-Davis, Davis, California; and
| | - Stephen A. Wank
- 2Digestive Diseases Branch, National Institute of Diabetes, Digestive, and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
| | - Helen E. Raybould
- 1Department of Anatomy, Physiology, and Cell Biology, School of Veterinary Medicine, University of California-Davis, Davis, California; and
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Sartor DM, Verberne AJ. Abdominal vagal signalling: A novel role for cholecystokinin in circulatory control? ACTA ACUST UNITED AC 2008; 59:140-54. [DOI: 10.1016/j.brainresrev.2008.07.002] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2008] [Revised: 06/24/2008] [Accepted: 07/07/2008] [Indexed: 02/07/2023]
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20
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Merino B, Cano V, Guzmán R, Somoza B, Ruiz-Gayo M. Leptin-mediated hypothalamic pathway of cholecystokinin (CCK-8) to regulate body weight in free-feeding rats. Endocrinology 2008; 149:1994-2000. [PMID: 18096657 DOI: 10.1210/en.2007-1286] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Regulation of body weight (BW) results from the interplay between different hormonal systems acting at central and peripheral level. This study aims at characterizing the involvement of cholecystokinin (CCK) in BW and energy balance regulation. We have characterized, in free-feeding rats, the effect of CCK-8 on 1) food intake, BW, and adiposity; 2) skeletal muscle metabolism; 3) leptin signaling pathway within the arcuate nucleus of the hypothalamus; and 4) the permeability of brain barriers to leptin. We demonstrate here that CCK-8 acutely decreases BW by a mechanism partially dependent on central leptin pathways, based on the following results: 1) the effect of CCK was less intense in rats lacking functional leptin receptors (Zucker fa/fa), 2) CCK-8 facilitated the uptake of leptin from peripheral circulation to cerebrospinal fluid (CSF), 3) the concentration of leptin in CSF of rats receiving CCK was more elevated in those animals showing higher loss of BW, and 4) CCK activated leptin signaling pathways within the hypothalamus as well as phosphorylation of AMP-activated protein kinase in skeletal muscle. We also suggest that gain of BW may be linked to individual susceptibility to the effect of CCK, because we observed that in animals treated with this hormone, the increase of BW negatively correlated with leptin concentration within the CSF. Our data show that CCK has a negative impact on energy balance and suggest that CCK facilitates the access of leptin to hypothalamic areas, thus allowing leptin to act on hypothalamic targets involved in BW control.
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Affiliation(s)
- Beatriz Merino
- Departamento de Farmacología, Tecnología y Desarrollo Farmacéutico, Universidad San Pablo-Ceu, Urbanización Montepríncipe, Boadilla del Monte, Madrid, Spain
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21
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Fisher E, Nitz I, Gieger C, Grallert H, Gohlke H, Lindner I, Dahm S, Boeing H, Burwinkel B, Rathmann W, Wichmann HE, Schrezenmeir J, Illig T, Döring F. Association of acyl-CoA-binding protein (ACBP) single nucleotide polymorphisms and type 2 diabetes in two German study populations. Mol Nutr Food Res 2007; 51:178-84. [PMID: 17262885 DOI: 10.1002/mnfr.200600163] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The human acyl-CoA-binding protein (ACBP) is a potential candidate gene of type 2 diabetes (T2D), since it plays a central role in determining the intracellular concentration of activated fatty acids which contribute to insulin resistance. The aim of our study was to evaluate whether single nucleotide polymorphisms (SNPs) of the ACBP gene are associated with risk of T2D. Genotyping of eight SNPs (rs2084202, rs3731607, rs8192501, rs8192504, rs2244135, rs2276596, rs8192506, rs2289948) was performed in 192 incident T2D subjects and 384 matched controls of the European Prospective Investigation into Cancer and Nutrition-Potsdam cohort. A putative promoter SNP (rs2084202) of splice variant ACBP 1c showed decreased risk of T2D (odds ratio (OR) 0.63, 95% CI 0.41-0.96). The haplotype, that contained the mutant base of rs2084202 showed similar evidence for the association with disease risk as single SNP rs2084202. In a second population-based study, Cooperative Health Research in the Augsburg Region of 226 individuals with T2D and 863 control subjects a borderline significant association between rs2084202 and T2D (OR 0.72, 95% CI 0.51-1.01) was observed. In summary, we obtained evidence from two Caucasian study populations that the minor allele of ACBP rs2084202 might be associated with reduced risk of T2D.
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Affiliation(s)
- Eva Fisher
- Department of Epidemiology, German Institute of Human Nutrition Potsdam-Rehbruecke, Nuthetal, Germany
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22
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Abstract
Inflammation of the pancreas has many presentations in children and adolescents. The etiology is often elusive, with a great number of cases being idiopathic. However, there have been a number of recent advances in the areas of cell biology, genetics and imaging technology, which should be highlighted. Herein is provided a review for the reader with particular emphasis on some of these newer advances.
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Affiliation(s)
- Andy Nydegger
- Department of Gastroenterology and Clinical Nutrition, Royal Children's Hospital, Victoria, Australia
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23
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Nitz I, Döring F, Schrezenmeir J, Burwinkel B. Identification of new acyl-CoA binding protein transcripts in human and mouse. Int J Biochem Cell Biol 2005; 37:2395-405. [PMID: 16055366 DOI: 10.1016/j.biocel.2005.06.008] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2004] [Revised: 05/26/2005] [Accepted: 06/07/2005] [Indexed: 11/24/2022]
Abstract
The ubiquitously expressed acyl-CoA binding protein (ACBP) is involved in lipid metabolism and is regulated by hormones and feeding status via transcription factors such as sterol regulatory element-binding protein 1 and peroxisome proliferator-activated receptor-gamma (PPARgamma). In humans, two transcripts encoding proteins of 86 and 104 amino acids are known, whereas in mouse only one protein of 86 amino acids is described. We identified new transcripts in human and mouse tissues, that had been generated by alternative first exon usage. Quantitative RT-PCR analyses showed a high expression of the new human transcript, ACBP-1c, in adipose tissue. By promoter reporter gene assays, specific regulation of this transcript by PPARgamma2 was revealed, implicating the usage of an alternative promoter that contains a PPARgamma responsive element. Subcellular localizations of the known human proteins and the new variant showed an occurrence in cytoplasma and nucleus. Reported studies concerning ACBP gene regulation should be re-evaluated with respect to a new ACBP gene model. Given the fact that the new variant is highly expressed in adipose tissue and a PPARgamma target, it might be relevant for diseases like diabetes and obesity.
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Affiliation(s)
- Inke Nitz
- Molecular Nutrition, Christian-Albrechts University of Kiel, Hermann-Weigmann-Strasse 1, D-24103 Kiel, Germany.
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24
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Sartor DM, Shulkes A, Verberne AJM. An enteric signal regulates putative gastrointestinal presympathetic vasomotor neurons in rats. Am J Physiol Regul Integr Comp Physiol 2005; 290:R625-33. [PMID: 16239368 DOI: 10.1152/ajpregu.00639.2005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Ingestion of a meal results in gastrointestinal (GI) hyperemia and is associated with systemic and paracrine release of a number of peptide hormones, including cholecystokinin (CCK) and 5-hydroxytryptamine (5-HT). Systemic administration of CCK octapeptide inhibits a subset of presympathetic neurons of the rostroventrolateral medulla (RVLM) that may be responsible for driving the sympathetic vasomotor tone to the GI viscera. The aim of this study was to determine whether endogenous release of CCK and/or 5-HT also inhibits CCK-sensitive RVLM neurons. The effects of intraduodenal administration of the secretagogues sodium oleate (SO) and soybean trypsin inhibitor (SBTI) on circulating levels of CCK and 5-HT were examined. In separate experiments, the discharge rates of barosensitive, medullospinal, CCK-sensitive RVLM presympathetic vasomotor neurons were recorded after rapid intraduodenal infusion of SO-SBTI or water. Alternatively, animals were pretreated with the CCK1 receptor antagonists devazepide and lorglumide or the 5-HT3 antagonist MDL-72222 before SO-SBTI administration. Secretagogue infusion significantly increased the level of circulating CCK, but not 5-HT. SO-SBTI significantly decreased (58%) the neuronal firing rate of CCK-sensitive RVLM neurons compared with water (5%). CCK1 receptor antagonists did not reverse SO-SBTI-induced neuronal inhibition (58%), whereas the 5-HT3 antagonist significantly attenuated the effect (22%). This study demonstrates a functional relation between a subset of RVLM presympathetic vasomotor neurons and meal-related signals arising from the GI tract. It is likely that endogenously released 5-HT acts in a paracrine fashion on GI 5-HT3 receptors to initiate reflex inhibition of these neurons, resulting in GI vasodilatation by withdrawal of sympathetic tone.
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Affiliation(s)
- Daniela M Sartor
- Clinical Pharmacology and Therapeutics Unit, Department of Medicine, University of Melbourne, Austin Health, Heidelberg, Victoria 3084, Australia.
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25
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Anjard C, Loomis WF. Peptide signaling during terminal differentiation of Dictyostelium. Proc Natl Acad Sci U S A 2005; 102:7607-11. [PMID: 15897458 PMCID: PMC1140433 DOI: 10.1073/pnas.0501820102] [Citation(s) in RCA: 80] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2005] [Indexed: 11/18/2022] Open
Abstract
A wide variety of mechanisms have evolved for intercellular communication in metazoans, but some of the signaling molecules were already used in their predecessors. The social amoeba, Dictyostelium discoideum, is known to use peptides to trigger sporulation within fruiting bodies, but their sequences have not been defined. We found that the peptide signal spore differentiation factor 2 (SDF-2) is processed from acyl-CoA binding protein, AcbA. The mammalian homolog of AcbA is processed to diazepam binding inhibitor that binds to the GABA(A) receptor in the brain and to peripheral 1,4 benzodiazepine receptors. Although Dictyostelium has neither GABA(A) nor peripheral-type benzodiazepine receptors, we find that both a diazepam binding inhibitor peptide and diazepam (Valium) can mimic SDF-2 in a Dictyostelium bioassay. Mutants lacking AcbA sporulate well only when developed in chimeras with WT cells. Using a yeast system we show that ligand binding to the SDF-2 receptor histidine kinase, DhkA, inhibits phosphorelay, which can account for its ability to induce rapid sporulation.
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Affiliation(s)
- Christophe Anjard
- Center for Molecular Genetics, Division of Biological Sciences, University of California at San Diego, La Jolla, CA 92093-0368, USA
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26
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Niederau C. Do cholecystokinin antagonists increase cytosolic calcium in pancreatic acinar cells and thereby promote pancreatitis? Dig Dis Sci 2004; 49:266-9. [PMID: 15104368 DOI: 10.1023/b:ddas.0000017449.51877.fc] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/09/2022]
Abstract
In a number of studies using animal models, and in a human study, cholecystokinin (CCK) antagonists ameliorated pancreatitis. In a recent report of a study in a rat model of obstructive acute pancreatitis, however, it was suggested that a potent CCK1 antagonist, L364,718, had proved harmful. This effect was attributed to an increase in free cytosolic calcium levels in pancreatic acinar cells. Our understanding of obstructive pancreatitis now rests on feedback mechanisms that control CCK levels and are disrupted when obstruction is present. CCK antagonism might interrupt the process of pancreatitis by reducing the increase in CCK levels that promotes enzyme release. This article reviews the findings obtained with CCK antagonists in several experimental models of pancreatitis and assesses the recent findings with L364,718 in that light.
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Affiliation(s)
- Claus Niederau
- Department of Medicine, St. Josef Hospital Oberhausen, Academic Teaching Hospital of the University of Essen, Oberhausen, Germany.
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27
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Abstract
During a meal, ingested nutrients accumulate in the stomach, with a significant portion passing on to the small intestine. The gastrointestinal presence of ingested nutrients initiates a range of physiological responses that serve to facilitate the overall digestive process. Thus peptides and transmitters are released, and various neural elements are activated that coordinate gastrointestinal secretion and motility and can eventually lead to meal termination or satiety. Among the range of gastrointestinal peptides released by ingested nutrients is the brain/gut peptide CCK. CCK plays a variety of roles in coordinating gastrointestinal activity and has been demonstrated to be an important mediator for the control of meal size.
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Affiliation(s)
- Timothy H Moran
- Johns Hopkins University School of Medicine, Department of Psychiatry and Behavioral Sciences, Baltimore, MD 21205, USA.
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28
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Graf R, Klauser S, Fukuoka SI, Schiesser M, Bimmler D. The bifunctional rat pancreatic secretory trypsin inhibitor/monitor peptide provides protection against premature activation of pancreatic juice. Pancreatology 2004; 3:195-206. [PMID: 12771515 DOI: 10.1159/000070729] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/16/2002] [Accepted: 12/06/2002] [Indexed: 12/11/2022]
Abstract
BACKGROUND In the rat, two forms of the pancreatic secretory trypsin inhibitor, PSTI-I and PSTI-II, are secreted into pancreatic juice. It is assumed that their role is to protect the pancreas from premature activation of the protease-rich pancreatic juice. In the small intestine, PSTI-I, also called 'monitor peptide', is thought to have a different role: PSTI-I competes with protein for activated trypsin. In the presence of a protein-rich meal, free PSTI induces a release of cholecystokinine from the intestine. METHODS To investigate whether its role as monitor peptide is compatible with the inhibitory, protective function in the pancreas, PSTI-I was chemically synthesized and then renatured. RESULTS The peptide was almost completely trypsin resistant and exhibited a dose-dependent inhibitory activity to bovine and partially purified rat trypsin. Furthermore, experiments with trypsin- and endopeptidase-activated pancreatic juice demonstrated that its inhibitory capacity was sufficient to prevent premature activation. Binding studies of (125)I-labeled PSTI-I with the putative intestinal receptor using isolated membranes indicated the presence of high-affinity binding sites (k(d) = 5 x 10(-8)M). Binding of PSTI-I could be competed with excess PSTI-I or trypsin. In a biological assay system, injections of PSTI-I displayed monitor peptide activity by inducing a dose-dependent trypsinogen release from the pancreas. CONCLUSION Our experiments support a dual function of PSTI-I: monitoring protein in the gut due to its 'moderate' affinity for trypsin and a protective role in the pancreas.
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Affiliation(s)
- R Graf
- Pancreatitis Research Laboratory, Department of Surgery, University Hospital, Zürich, Switzerland.
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Chowdhury RS, Forsmark CE, Davis RH, Toskes PP, Verne GN. Prevalence of gastroparesis in patients with small duct chronic pancreatitis. Pancreas 2003; 26:235-8. [PMID: 12657948 DOI: 10.1097/00006676-200304000-00005] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
INTRODUCTION The most common symptoms of chronic pancreatitis are abdominal pain, diarrhea, and weight loss. The abdominal pain has no consistent pattern, and nausea and vomiting commonly occur simultaneously. Gastroparesis may produce similar symptoms. These similar symptoms may cause diagnostic confusion, particularly with regard to patients with small-duct chronic pancreatitis, for whom diagnosis of chronic pancreatitis is most difficult. We have observed that coexistent gastroparesis may also interfere with the effectiveness of pancreatic enzyme therapy by failing to deliver proteases into the duodenum and therefore not restoring feedback control of pancreatic secretion. AIM To estimate the prevalence of gastroparesis in patients with minimal-change chronic pancreatitis. METHODOLOGY Patients with chronic pancreatitis diagnosed on the basis of secretin test results but with otherwise normal pancreatic imaging (ultrasonographic or computed tomographic) findings who had also undergone a gastric emptying study were retrospectively identified. An abnormal secretin test value was defined as a peak bicarbonate concentration in pancreatic secretions of <80 mEq/L after secretin stimulation. Gastroparesis was defined as an emptying half-time greater than 90 minutes. RESULTS Fifty-six patients were identified. Twenty-five of the 56 patients (44%) had concomitant gastroparesis and small-duct chronic pancreatitis. Twenty-four of these 25 were women, and 22 of the 25 had idiopathic small-duct chronic pancreatitis. CONCLUSION In our referral population, gastroparesis is frequently seen in patients with small-duct chronic pancreatitis. For patients with small-duct disease whose abdominal pain does not respond to pancreatic enzyme therapy, clinicians should consider an evaluation for gastroparesis.
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Affiliation(s)
- Riaz S Chowdhury
- Division of Gastroenterology, Hepatology, and Nutrition, University of Florida College of Medicine, Gainesville, Florida, USA
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Long chain acyl-CoA esters and acyl-CoA binding protein (ACBP) in cell function. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/s1569-2558(03)33008-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Wu CL, Hung CR, Chang FY, Lin LC, Pau KYF, Wang PS. Effects of evodiamine on gastrointestinal motility in male rats. Eur J Pharmacol 2002; 457:169-76. [PMID: 12464363 DOI: 10.1016/s0014-2999(02)02687-0] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The effects of evodiamine on gastric emptying, gastrointestinal transit, and plasma levels of cholecystokinin (CCK) were studied in male rats. Evodiamine, isolated from the dry unripened fruit of Evodia rutaecarpa Bentham (a Chinese medicine named Wu-chu-yu), has been recommended for abdominal pain, acid regurgitation, nausea, diarrhea, and dysmenorrhea. Gastrointestinal motility was assessed in rats 15 min after intragastric instillation of a test meal containing charcoal and Na(2)51CrO(4). Gastric emptying was determined by measuring the amount of radiolabeled chromium contained in the small intestine as a percentage of the initial amount received. Gastrointestinal transit was evaluated by calculating the geometric center of distribution of the radiolabeled marker. Blood samples were collected for CCK radioimmunoassay (RIA). After administration of evodiamine (0.67-6.00 mg/kg), both gastric emptying and gastrointestinal transit were inhibited, whereas the plasma concentration of CCK was increased in a dose-dependent manner. The selective CCK(1) receptor antagonists, devazepide and lorglumide, effectively attenuated the evodiamine-induced inhibition of gastric emptying and gastrointestinal transit. L-365,260 (3R-(+)-N-(2,3-dihydro-1-methyl-2-oxo-5-phenyl-1H-1,4-benzodiazepine-3-yl)-N'-(3-methylphenyl)-urea), a selective CCK(2) receptor antagonist, did not alter the evodiamine-induced inhibition of gastric emptying and gastrointestinal transit. These results suggest that evodiamine inhibits both gastric emptying and gastrointestinal transit in male rats via a mechanism involving CCK release and CCK(1) receptor activation.
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Affiliation(s)
- Chiu-Lung Wu
- Department of Physiology, School of Medicine, National Yang-Ming University, Shih-Pai, Taipei 11221, Taiwan, ROC
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Abstract
Exocrine pancreatic secretion is regulated by hormone-hormonal and neural-hormonal interactions involving several regulatory peptides and neurotransmitter from the gut, the pancreas and the vagus nerve. The roles of the gastrointestinal peptides including secretin, CCK, neurotensin, motilin, PYY and pancreatic islet hormones including insulin, pancreatic polypeptide and somatostatin have been established. Interactions among secretin, CCK and neurotensin produce synergistic stimulatory effect. Motilin modulates the cyclic pattern of pancreatic secretion while local insulin provides a permissive role for the action of secretin and CCK at physiological concentration. Somatostatin, PYY and pancreatic polypeptide are inhibitory regulators, acting either on the release of secretin and CCK or on the action of the two stimulatory hormones. The vagal afferent-efferent pathway mediates the actions of many of these regulatory peptides, particularly of secretin and CCK. Acetylcholine and nitric oxide are the neurotransmitters known to mediate the actions of secretin and CCK. Serotonin (5-HT) released from enterochromaffin cells in the intestinal mucosa and nerve terminals of the enteric nervous system and intrapancreatic nerves may be involved in both stimulatory and inhibitory mechanism through its various receptor subtypes. 5-HT also mediates the action of secretin and CCK. The regulatory roles of neuropeptides, PACP and GRP, are now established, whereas those of others are being uncovered. Pancreatic juice provides both positive and negative feedback regulation of pancreatic secretion through mediation of both secretin- and CCK-releasing peptides. Three CCK-releasing peptides have been purified: monitor peptide from pancreatic juice, diazepam-binding inhibitor from porcine intestine, and luminal CCK-releasing factor from rat intestinal secretion. All have been shown to stimulate CCK release and pancreatic enzyme secretion. Pancreatic phospholipase A2 from pancreatic juice and intestinal secretion appears to function as a secretin-releasing peptide. However, the detailed map of neurohormonal regulatory pathways of exocrine pancreatic secretion is yet to be constructed.
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Affiliation(s)
- W Y Chey
- Rochester Institute for Digestive Diseases and Sciences, 222 Alexander Street, Suite 3100, Rochester, NY 14607, USA.
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Yanase H, Shimizu H, Yamada K, Iwanaga T. Cellular localization of the diazepam binding inhibitor in glial cells with special reference to its coexistence with brain-type fatty acid binding protein. ARCHIVES OF HISTOLOGY AND CYTOLOGY 2002; 65:27-36. [PMID: 12002608 DOI: 10.1679/aohc.65.27] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The diazepam binding inhibitor (DBI) was originally isolated from the brain as an intrinsic ligand of the benzodiazepine binding site on the type-A gamma-aminobutyric acid receptor (GABA(A) receptor). Its wide-spread distribution in non-neural tissues outside the brain suggests that DBI has various functions other than GABA-mediated neurotransmission. Since DBI is identical with the acyl-CoA binding protein, which has the ability to bind long chain acyl-CoA esters, the major function of DBI may possibly be related to lipid metabolism. This idea was supported by our previous study showing the consistent coexpression of DBI and fatty acid binding proteins (FABPs) in epithelia throughout the gastrointestinal tract. The present histochemical study focused on the distribution of DBI in neural tissues, and revealed a definite existence of DBI in non-neuronal supporting cells in both the central and peripheral nervous systems. In the brain, intense immunoreactivity for DBI was detected in the cerebellar Bergmann glia, olfactory ensheathing glia, subgranular layer of the dentate gyrus, and retinal Muller cells. In the peripheral nervous system, satellite cells in sensory/autonomic ganglia, Schwann cells, and sustentacular cells in the adrenal medulla were immunoreactive to a DBI antibody. Moreover, the colocalization of DPI and brain-type FABP (B-FABP) was observed in most of the non-neuronal supporting cells mentioned above, indicating that DBI and B-FABP are cooperatively involved in the energy metabolism of astrocytes and related cells, which are thought to support neuronal development and functions.
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Affiliation(s)
- Haruko Yanase
- Laboratory of Anatomy, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan
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Miyasaka K, Masuda M, Kanai S, Ohta M, Suzuki S, Tateishi K, Funakoshi A. Inhibitory effect of somatostatin on cholecystokinin release is independent of luminal cholecystokinin-releasing factor content in conscious rats. Pancreas 2001; 23:414-20. [PMID: 11668212 DOI: 10.1097/00006676-200111000-00013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Abstract
INTRODUCTION Exclusion of bile-pancreatic juice from the intestine increases pancreatic secretion via cholecystokinin (CCK) release in conscious rats. Luminal CCK-releasing factor (LCRF), purified from rat intestinal secretions, is an intraluminal regulator of CCK secretion during bile-pancreatic juice diversion. AIMS Because somatostatin is a potent inhibitor of CCK release and pancreatic secretion, the inhibitory effect of somatostatin on LCRF was examined. METHODOLOGY Rats were prepared with bile and pancreatic cannulae and two duodenal cannulae and with an external jugular vein cannula. The experiments were conducted without anesthesia. After 1.5-hour basal collection of pancreatic juice with bile-pancreatic juice return, bile-pancreatic juice was diverted for 2 hours, during which time somatostatin (2, 10 nmol/kg/h) was infused intravenously. The rats were killed before and 1 and 2 hours after bile-pancreatic juice diversion. To examine the effect of luminal somatostatin, 50 or 200 nmol/kg/h of somatostatin was infused into the duodenum. The plasma CCK and luminal content of LCRF were measured by specific radioimmunoassays. RESULTS Bile-pancreatic juice diversion significantly increased pancreatic secretion, plasma CCK, and LCRF levels. Intravenous infusion of somatostatin inhibited CCK release and pancreatic secretion, but not LCRF content. Luminal administration of somatostatin did not show any effect. CONCLUSION Inhibitory effect of circulating somatostatin on CCK release and pancreatic secretion is independent of LCRF content.
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Affiliation(s)
- K Miyasaka
- Department of Clinical Physiology, Tokyo Metropolitan Institute of Gerontology, 35-2 Sakaecho, Itabashiku, Tokyo-173-0015, Japan.
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Li Y, Wu XY, Zhu JX, Owyang C. Intestinal serotonin acts as paracrine substance to mediate pancreatic secretion stimulated by luminal factors. Am J Physiol Gastrointest Liver Physiol 2001; 281:G916-23. [PMID: 11557511 DOI: 10.1152/ajpgi.2001.281.4.g916] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
We recently demonstrated that luminal factors such as osmolality, disaccharides, and mechanical stimulation evoke pancreatic secretion by activating 5-hydroxytryptamine subtype 3 (serotonin-3, 5-HT3) receptors on mucosal vagal afferent fibers in the intestine. We hypothesized that 5-HT released by luminal stimuli acts as a paracrine substance, activating the mucosal vagal afferent fibers to stimulate pancreatic secretion. In the in vivo rat model, luminal perfusion of maltose or hypertonic NaCl increased 5-HT level threefold in intestinal effluent perfusates. Similar levels were observed after intraluminal 10(-5) M 5-HT perfusion. These treatments did not affect 5-HT blood levels. In a separate study, intraduodenal, but not intraileal, 5-HT application induced a dose-dependent increase in pancreatic protein secretion, which was not blocked by the CCK-A antagonist CR-1409. Acute vagotomy, methscopolamine, or perivagal or intestinal mucosal application of capsaicin abolished 5-HT-induced pancreatic secretion. In conscious rats, luminal 10(-5) M 5-HT administration produced a 90% increase in pancreatic protein output, which was markedly inhibited by the 5-HT3 antagonist ondansetron. In conclusion, luminal stimuli induce 5-HT release, which in turn activates 5-HT3 receptors on mucosal vagal afferent terminals. In this manner, 5-HT acts as a paracrine substance to stimulate pancreatic secretion via a vagal cholinergic pathway.
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Affiliation(s)
- Y Li
- Gastroenterology Research Unit, Department of Internal Medicine, University of Michigan Health System, Ann Arbor, Michigan 48109-0682, USA.
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Yanase H, Shimizu H, Kanda T, Fujii H, Iwanaga T. Cellular localization of the diazepam binding inhibitor (DBI) in the gastrointestinal tract of mice and its coexistence with the fatty acid binding protein (FABP). ARCHIVES OF HISTOLOGY AND CYTOLOGY 2001; 64:449-60. [PMID: 11757913 DOI: 10.1679/aohc.64.449] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The diazepam binding inhibitor (DBI), initially isolated as an endogenous 10-kDa polypeptide from the brain, has the ability to displace ligands from benzodiazepine binding sites on gamma-aminobutyric acid (GABA) receptors. However, DBI is widely distributed outside the brain, with the highest expression in the intestine. The present in situ hybridization study revealed the cellular expression of DBI mRNA throughout the gastrointestinal tract of mice, showing it to be intensely expressed in the spinous layer in the stratified squamous epithelium of the oral cavity, esophagus and forestomach, in surface mucous cells in the glandular stomach, and in columnar (absorptive) cells of the intestinal villi. A precise identification of DBI-expressing cell types was confirmed immunohistochemically, although the expressing cells detectable by the two histochemical methods differed slightly in their extension. Noteworthily, DBI always coexisted with the fatty acid binding protein (FABP), which participates in the uptake and metabolic processing of long chain fatty acids. In addition to the biochemical finding that DBI is identical with the acyl-CoA binding protein (ACBP), the distributional patterns of DBI and its colocalization with FABPs suggests its involvement in the absorption and metabolism of lipid in the epithelia of the digestive tract.
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Affiliation(s)
- H Yanase
- Laboratory of Anatomy, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan
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Abstract
The exocrine pancreas is regulated by various hormonal factors derived from the gut through hormone-hormonal and neurohormonal interactions. Physiologic stimuli entering the upper small intestine elicit the release of intestinal hormones and activate sensory reflex mechanisms from the intestinal mucosa to stimulate or inhibit exocrine pancreatic secretion. In addition, the endocrine pancreas, intrapancreatic nerves, and some extrapancreatic neural pathways, with or without mediation by the vagus nerve, are known to participate in regulation of exocrine pancreatic secretion. It has been established that two key intestinal hormones, secretin and cholecystokinin (CCK), in physiologic doses, act through the vagal afferent pathway and interact with each other as well as with other gut hormones. The releases of these two hormones are mediated through the corresponding releasing peptides. In the past few years, the roles of secretin- and CCK-releasing peptides have become more clearly defined. The participation of several neurotransmitters and regulatory peptides in the regulation of exocrine pancreatic secretion has also been established. In addition, neurotransmitters and neuropeptides released from the central nervous system may participate in the regulation of pancreatic secretion. It is conceivable that a few neurotransmitters and neuropeptides are involved in each neural regulatory pathway. However, their roles and sites of action in each pathway remain to be determined.
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Affiliation(s)
- T M Chang
- Rochester Institute for Digestive Diseases and Sciences, Rochester, New York 14607, USA
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Cowles RA, Segura BJ, Mulholland MW. Stimulation of rat pancreatic exocrine secretion by cocaine- and amphetamine-regulated transcript peptide. REGULATORY PEPTIDES 2001; 99:61-8. [PMID: 11257316 DOI: 10.1016/s0167-0115(01)00226-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Cocaine- and amphetamine-regulated transcript (CART) peptide is a recently described neuropeptide that has been localized to areas of the central and peripheral nervous systems. CART has been shown to be involved in feeding behavior when injected centrally, however, its effects upon peripheral tissues have not been studied. This report describes the effects of CART peptide on rat pancreatic exocrine secretion. Infusion of CART peptide caused four-fold increases in amylase secretion from anesthetized rats that had been fashioned with a bile-pancreatic duct cannula. CART peptide-induced increases in pancreatic secretion appear to involve pathways that are sensitive to both acetylcholine (ACh) and cholecystokinin (CCK) since pre-treatment with atropine (ACh receptor antagonist) or L-364,718 (CCK-A receptor antagonist) inhibited the effects of CART peptide on amylase secretion. Pre-treatment with a combination of atropine and L-364,718 abolished the effects of CART peptide. When isolated rat pancreatic acini were exposed to varying doses of CART peptide, no increase in amylase secretion was observed. The results of the present study suggest that CART peptide has stimulatory effects upon pancreatic exocrine secretion. CART peptide-induced increases in pancreatic secretion appear to be indirectly mediated as no direct effect upon pancreatic acini was shown. CART peptide likely acts upon either peripheral or central regulators of pancreatic secretory function that are distant from the acinar unit.
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Affiliation(s)
- R A Cowles
- Department of Surgery, University of Michigan, 2920B Taubman Center, 1500 East Medical Center Drive, Ann Arbor, MI 48109-0331, USA
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de Mateos-Verchere JG, Leprince J, Tonon MC, Vaudry H, Costentin J. The octadecaneuropeptide [diazepam-binding inhibitor (33-50)] exerts potent anorexigenic effects in rodents. Eur J Pharmacol 2001; 414:225-31. [PMID: 11239923 DOI: 10.1016/s0014-2999(01)00771-3] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The effects of intracerebroventricular administration of the octadecaneuropeptide ODN on food intake have been investigated in rat and mouse. In rats deprived of food from 9:00 a.m. to 7:00 p.m., i.c.v. injection of ODN (30 to 100 ng) provoked a dose-dependent reduction of food consumption during the following 12-h nocturnal period. At a dose of 100 ng, ODN almost completely suppressed food intake. Treatment of rats with diazepam (2 mg/kg s.c.; 15 min before ODN administration) did not affect the anorexigenic response evoked by 100 ng ODN. Continuous i.c.v. infusion of ODN (10 ng/h during 15 days) using osmotic minipumps, significantly reduced food intake during the 2nd, 3rd and 4th days of treatment. The decrease in food consumption was associated with a significant reduction in body weight, which persisted during the 15-day duration of the experiment. In mice deprived of food for 18 h, i.c.v. administration of a low dose of ODN (5 ng) significantly reduced food intake. Treatment of mice with diazepam (1 mg/kg s.c.; 10 min before ODN administration) did not prevent the inhibitory effect of ODN (100 ng) on food intake. The C-terminal octapeptide fragment of ODN mimicked the anorexigenic effect of the intact peptide. Taken together, the present data demonstrate that i.c.v. injection of ODN causes, in both rat and mouse, a long-lasting anorexigenic effect that is not mediated through central-type benzodiazepine receptors. The biologically active region of ODN appears to be located in the C-terminal domain of the peptide.
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Affiliation(s)
- J G de Mateos-Verchere
- Institut Fédératif de Recherches Multidisciplinaires sur les Peptides (IFRMP 23), Unité de Neuropsychopharmacologie, France
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Zhu JX, Zhu XY, Owyang C, Li Y. Intestinal serotonin acts as a paracrine substance to mediate vagal signal transmission evoked by luminal factors in the rat. J Physiol 2001; 530:431-42. [PMID: 11158274 PMCID: PMC2278417 DOI: 10.1111/j.1469-7793.2001.0431k.x] [Citation(s) in RCA: 197] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2000] [Accepted: 09/29/2000] [Indexed: 12/29/2022] Open
Abstract
The vagus nerve conveys primary afferent information produced by a meal to the brainstem. Serotonin (5-HT), which abounds in intestinal enterochromaffin cells, is released in response to various stimuli. We have recently demonstrated that 5-HT released from intestinal enterochromaffin cells activates 5-HT3 receptors on vagal afferent fibres to mediate luminal non-cholecystokinin-stimulated pancreatic secretion. The present study was designed to evaluate the responses of vagal sensory neurons to intraluminal osmotic stimulation and luminal infusion of maltose, glucose or 5-HT. We investigated the role of endogenous 5-HT in signal transmission evoked by luminal stimuli to activate vagal sensory neurons. The discharges of vagal primary afferent neurons innervating the intestine were recorded from rat nodose ganglia. Luminal factors such as intestinal osmotic stimuli and perfusion of carbohydrates elicited powerful vagal nodose responses. Electrical subdiaphragmatic vagal stimulation activated 364 single units; 40 of these responded to intestinal mucosal stimuli. Of these 40, 30 responded to intraduodenal perfusion of hyperosmolar NaCl (500 mosmol l(-1)), 27 responded to tap water (5 mosmol l(-1)) and 20 and 19 responded to maltose (300 mM) and glucose (277.5 mM), respectively. The 5-HT3/4 antagonist tropisetron (ICS 205-930) or 5-HT3 antagonist granisetron abolished luminal stimuli-evoked nodose neuronal responses. Intraluminal infusion of 10(-5) and 10(-4) M 5-HT elicited increases in vagal afferent discharge in 25 and 31 units, respectively, by activating the 5-HT3 receptors. Acute subdiaphragmatic vagotomy, intestinal mucosal application of the local anaesthetic lidocaine (lignocaine) or administration of 5-HT3 antagonist each abolished the luminal 5-HT-induced nodose neuronal responses. In contrast, distension-sensitive neurons did not respond to duodenal infusion of 5-HT. Pharmacological depletion of 5-HT stores using p-chlorophenylalanine (PCPA), a 5-HT-synthesis inhibitor, abolished luminal factor-stimulated nodose neuronal responses. In contrast, pretreatment with 5,7-dihydroxytryptamine (5,7-DHT), a specific 5-HT neurotoxin that destroys 5-HT-containing neurons without affecting 5-HT-containing mucosal cells, had no effect on these responses. These results suggested that the nodose neuronal responses to luminal osmolarity and to the digestion products of carbohydrates are dependent on the release of endogenous 5-HT from the mucosal enterochromaffin cells, which acts on the 5-HT3 receptors on vagal afferent fibres to stimulate vagal sensory neurons.
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Affiliation(s)
- J X Zhu
- Gastroenterology Research Unit, Department of Internal Medicine, University of Michigan Health System, Ann Arbor, MI, USA
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Li Y, Hao Y, Zhu J, Owyang C. Serotonin released from intestinal enterochromaffin cells mediates luminal non-cholecystokinin-stimulated pancreatic secretion in rats. Gastroenterology 2000; 118:1197-207. [PMID: 10833495 DOI: 10.1016/s0016-5085(00)70373-8] [Citation(s) in RCA: 126] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
BACKGROUND & AIMS Similar to cholecystokinin (CCK), non-CCK-dependent duodenal factors stimulate vagal mucosal afferent fibers to mediate pancreatic enzyme secretion via a common cholinergic pathway. We tested the hypothesis that 5-hydroxytryptamine (5-HT) released from enterochromaffin (EC) cells plays an important role in the transduction of luminal information to the central nervous system via vagal afferent fibers to mediate pancreatic secretion. METHODS Pancreatic secretions were examined in conscious rats after intragastric administration of chopped rodent chow in the presence and absence of CCK or 5-HT(3) and 5-HT(2) antagonists. Pancreatic responses to intraduodenal administration of maltose, hyperosmolar NaCl, and light mucosal stroking were examined in rats pretreated with various pharmacological antagonists or after surgical or chemical ablation of vagal and 5-HT neural pathways. RESULTS Administration of L364, 718 inhibited 54% of pancreatic protein secretion evoked by intragastric administration of rodent chow. L364,714 and ICS 205-930, a 5-HT(3) antagonist, combined produced a 94% inhibition. Vagal afferent rootlet section eliminated pancreatic secretions evoked by intraduodenal stimuli. p-Chlorophenylalanine, a 5-HT synthesis inhibitor, but not 5,7-hydroxytryptamine, a 5-HT neurotoxin, also eliminated the pancreatic response to these luminal stimuli. The 5-HT(3) antagonist markedly inhibited pancreatic secretion induced by maltose and hyperosmolar NaCl. 5-HT(2) and 5-HT(3) antagonists combined inhibited the pancreatic response to light stroking of the mucosa. CONCLUSIONS Luminal factors such as osmolality, disaccharides, and mechanical stimulation stimulated pancreatic secretion via intestinal vagal mucosal afferent fibers. It is likely that 5-HT originating from intestinal EC cells activated 5-HT(3) and 5-HT(2) receptors on vagal afferent fibers to mediate luminal factor-stimulated pancreatic secretion.
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MESH Headings
- 5,7-Dihydroxytryptamine/pharmacology
- Animals
- Cholecystokinin/metabolism
- Consciousness
- Devazepide/pharmacology
- Duodenum/physiology
- Eating
- Enteral Nutrition
- Enterochromaffin Cells/metabolism
- Fenclonine/pharmacology
- Gastric Mucosa/physiology
- Hormone Antagonists/pharmacology
- Hypertonic Solutions/pharmacology
- Indoles/pharmacology
- Male
- Maltose/pharmacology
- Nerve Fibers/chemistry
- Nerve Fibers/drug effects
- Nerve Fibers/metabolism
- Pancreas/innervation
- Pancreas/metabolism
- Physical Stimulation
- Rats
- Rats, Sprague-Dawley
- Receptor, Serotonin, 5-HT2A
- Receptors, Serotonin/metabolism
- Receptors, Serotonin, 5-HT1
- Receptors, Serotonin, 5-HT3
- Serotonin/metabolism
- Serotonin Agents/pharmacology
- Serotonin Antagonists/pharmacology
- Sodium Chloride, Dietary/pharmacology
- Tropisetron
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Affiliation(s)
- Y Li
- Gastroenterology Research Unit, Department of Internal Medicine, University of Michigan Health System, Ann Arbor, Michigan, USA
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