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Verdú E, Homs J, Boadas-Vaello P. Physiological Changes and Pathological Pain Associated with Sedentary Lifestyle-Induced Body Systems Fat Accumulation and Their Modulation by Physical Exercise. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 18:ijerph182413333. [PMID: 34948944 PMCID: PMC8705491 DOI: 10.3390/ijerph182413333] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 12/02/2021] [Accepted: 12/10/2021] [Indexed: 12/11/2022]
Abstract
A sedentary lifestyle is associated with overweight/obesity, which involves excessive fat body accumulation, triggering structural and functional changes in tissues, organs, and body systems. Research shows that this fat accumulation is responsible for several comorbidities, including cardiovascular, gastrointestinal, and metabolic dysfunctions, as well as pathological pain behaviors. These health concerns are related to the crosstalk between adipose tissue and body systems, leading to pathophysiological changes to the latter. To deal with these health issues, it has been suggested that physical exercise may reverse part of these obesity-related pathologies by modulating the cross talk between the adipose tissue and body systems. In this context, this review was carried out to provide knowledge about (i) the structural and functional changes in tissues, organs, and body systems from accumulation of fat in obesity, emphasizing the crosstalk between fat and body tissues; (ii) the crosstalk between fat and body tissues triggering pain; and (iii) the effects of physical exercise on body tissues and organs in obese and non-obese subjects, and their impact on pathological pain. This information may help one to better understand this crosstalk and the factors involved, and it could be useful in designing more specific training interventions (according to the nature of the comorbidity).
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Affiliation(s)
- Enrique Verdú
- Research Group of Clinical Anatomy, Embryology and Neuroscience (NEOMA), Department of Medical Sciences, University of Girona, 17003 Girona, Spain;
- Correspondence: (E.V.); (P.B.-V.)
| | - Judit Homs
- Research Group of Clinical Anatomy, Embryology and Neuroscience (NEOMA), Department of Medical Sciences, University of Girona, 17003 Girona, Spain;
- Department of Physical Therapy, EUSES-University of Girona, 17190 Salt, Spain
| | - Pere Boadas-Vaello
- Research Group of Clinical Anatomy, Embryology and Neuroscience (NEOMA), Department of Medical Sciences, University of Girona, 17003 Girona, Spain;
- Correspondence: (E.V.); (P.B.-V.)
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Fryk E, Strindberg L, Lundqvist A, Sandstedt M, Bergfeldt L, Mattsson Hultén L, Bergström G, Jansson PA. Galectin-1 is inversely associated with type 2 diabetes independently of obesity - A SCAPIS pilot study. Metabol Open 2019; 4:100017. [PMID: 32812946 PMCID: PMC7424824 DOI: 10.1016/j.metop.2019.100017] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2019] [Revised: 08/16/2019] [Accepted: 09/03/2019] [Indexed: 01/07/2023] Open
Abstract
Objectives Galectin-1 is a recently discovered adipokine that increases with obesity and increased energy intake in adipose tissue. Our aim was to assess whether serum galectin-1 is associated with type 2 diabetes (T2D) and other parameters of the metabolic syndrome independently of body mass index (BMI) in a cohort from the general population. Methods In this cross-sectional population-based cohort study from the western part of Sweden, we investigated associations between serum galectin-1, clinical characteristics and inflammatory markers in 989 women and men aged 50-65 years [part of the Swedish CArdioPulmonary bioImage Study (SCAPIS) pilot cohort]. Results We showed in linear models that serum galectin-1 was independently and: (1) inversely associated with T2D (p < 0.05) and glucose (p < 0.05); and (2) positively associated with age (p < 0.01), sex (p < 0.01), BMI (p < 0.01), insulin (p < 0.01) and C-reactive protein (p < 0.01). Furthermore, galectin-1 demonstrated univariate correlations with triglycerides (r = 0.20, p < 0.01), homeostasis model assessment for insulin resistance (r = 0.24, p < 0.01), tumor necrosis factor-α (r = 0.24, p < 0.01), interleukin-6 (IL-6; r = 0.20, p < 0.01) and HbA1c (r = 0.14, p < 0.01). Conclusion In a cross-sectional study of a middle-aged population, we showed that serum galectin-1 is: (1) inversely associated with T2D independently of BMI; and (2) independently associated with other markers of the metabolic syndrome These results warrant prospective and functional studies on the role of galectin-1 in T2D.
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Key Words
- ALAT, alanine aminotransferase
- BMI, body mass index
- CRP, C-reactive protein
- Cross-sectional
- ELISA, electrochemiluminescence immunoassay
- Galectin-1
- HDL, high-density lipoprotein
- HOMA, homeostasis model assessment
- IFN-γ, interferon gamma
- IL, interleukin
- LDL, low-density lipoprotein
- MSD, Meso Scale Diagnostics
- Metabolic syndrome
- Obesity
- SCAPIS, Swedish CArdioPulmonary bioImage Study
- SEM, standard error of the mean
- Sex
- T2D, type 2 diabetes
- TNF-α, tumor necrosis factor-α
- Type 2 diabetes
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Affiliation(s)
- Emanuel Fryk
- Department of Molecular and Clinical Medicine, Wallenberg Laboratory, Institute of Medicine, The Sahlgrenska Academy, University of Gothenburg and the Sahlgrenska University Hospital, Gothenburg, Sweden
- Corresponding author. Wallenberg Laboratory Department of Molecular and Clinical Medicine Institute of Medicine, The Sahlgrenska Academy University of Gothenburg, Gothenburg, Sweden.
| | - Lena Strindberg
- Department of Molecular and Clinical Medicine, Wallenberg Laboratory, Institute of Medicine, The Sahlgrenska Academy, University of Gothenburg and the Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Annika Lundqvist
- Department of Molecular and Clinical Medicine, Wallenberg Laboratory, Institute of Medicine, The Sahlgrenska Academy, University of Gothenburg and the Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Mikael Sandstedt
- Department of Clinical Chemistry, Sahlgrenska University Hospital and Department of Laboratory Medicine, Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Lennart Bergfeldt
- Department of Molecular and Clinical Medicine/Cardiology, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, and Region Västra Götaland, Department of Cardiology, Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Lillemor Mattsson Hultén
- Department of Molecular and Clinical Medicine, Wallenberg Laboratory, Institute of Medicine, The Sahlgrenska Academy, University of Gothenburg and the Sahlgrenska University Hospital, Gothenburg, Sweden
- Department of Clinical Chemistry, Sahlgrenska University Hospital and Department of Laboratory Medicine, Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Göran Bergström
- Department of Molecular and Clinical Medicine, Wallenberg Laboratory, Institute of Medicine, The Sahlgrenska Academy, University of Gothenburg and the Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Per-Anders Jansson
- Department of Molecular and Clinical Medicine, Wallenberg Laboratory, Institute of Medicine, The Sahlgrenska Academy, University of Gothenburg and the Sahlgrenska University Hospital, Gothenburg, Sweden
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Bonato L, Taleb N, Gingras V, Messier V, Gobeil F, Ménard J, Ardilouze JL, Rabasa-Lhoret R. Duration of Catheter Use in Patients with Diabetes Using Continuous Subcutaneous Insulin Infusion: A Review. Diabetes Technol Ther 2018; 20:506-515. [PMID: 29958025 DOI: 10.1089/dia.2018.0110] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Increasing proportions of patients with diabetes use continuous subcutaneous insulin infusion (CSII) therapy mostly due to its clinical efficacy and flexibility for insulin dosing and adjustments. Some challenges are nevertheless associated with this technology. A key and underlooked component of CSII technical difficulties is the subcutaneous catheter used to infuse insulin. Several adverse events (AEs) have been experienced by patients in relation to catheters, such as blockage, kinking, and insertion site reactions, including irritation, infections, lipohypertrophies etc., all of which could compromise the metabolic control. With the objective of minimizing these AEs, recommendations for changing catheters every 2-3 days have historically been provided by manufacturers based on reports derived from small studies and anecdotal data. The aim of this review was to provide an updated analysis of current recommendations and patients' practices in relation to frequency of catheter change. Our main findings are: (1) adequately designed and powered studies investigating optimal catheter wearing time are still lacking; (2) increasing catheter wearing time is generally associated with increased frequency of catheter AEs; (3) however, interpatient variability is large, with some individuals needing to change their catheters every 2-3 days, whereas others probably being able to keep them in place for longer periods without problems. Further research is thus warranted to provide more solid and evidence-based recommendations while exploring personalized approaches at the same time. Increasing catheter wear life without significant side effects is an important goal to simplify CSII therapy and reduce its associated costs and burdens.
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Affiliation(s)
- Lisa Bonato
- 1 Research Platform on obesity, metabolism and diabetes, Institut de Recherches Cliniques de Montréal (IRCM) , Montréal, Québec, Canada
| | - Nadine Taleb
- 1 Research Platform on obesity, metabolism and diabetes, Institut de Recherches Cliniques de Montréal (IRCM) , Montréal, Québec, Canada
- 2 Department of Biomedical Sciences, Faculty of Medecine, Université de Montréal , Édouard-Montpetit, Montréal, Québec, Canada
| | - Véronique Gingras
- 1 Research Platform on obesity, metabolism and diabetes, Institut de Recherches Cliniques de Montréal (IRCM) , Montréal, Québec, Canada
- 3 Department of Nutrition, Faculty of Medecine, Université de Montréal , Chemin de la Côte-Sainte-Catherine, Montréal, Québec, Canada
| | - Virginie Messier
- 1 Research Platform on obesity, metabolism and diabetes, Institut de Recherches Cliniques de Montréal (IRCM) , Montréal, Québec, Canada
| | - Fernand Gobeil
- 4 Department of Pharmacology and Physiology, Faculty of Medicine and Health Sciences, Université de Sherbrooke , Sherbrooke, Québec, Canada
- 5 Diabetes, obesity and cardiovscular complications axis, Research Center of the Centre Hospitalier Universitaire de Sherbrooke , Sherbrooke, Québec, Canada
| | - Julie Ménard
- 5 Diabetes, obesity and cardiovscular complications axis, Research Center of the Centre Hospitalier Universitaire de Sherbrooke , Sherbrooke, Québec, Canada
| | - Jean-Luc Ardilouze
- 5 Diabetes, obesity and cardiovscular complications axis, Research Center of the Centre Hospitalier Universitaire de Sherbrooke , Sherbrooke, Québec, Canada
- 6 Endocrine Division, Department of Medicine, Faculty of Medicine and Health Sciences, Université de Sherbrooke , Sherbrooke, Québec, Canada
| | - Rémi Rabasa-Lhoret
- 1 Research Platform on obesity, metabolism and diabetes, Institut de Recherches Cliniques de Montréal (IRCM) , Montréal, Québec, Canada
- 3 Department of Nutrition, Faculty of Medecine, Université de Montréal , Chemin de la Côte-Sainte-Catherine, Montréal, Québec, Canada
- 7 Montréal Diabetes Research Center , Saint-Denis Montréal, Québec, Canada
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Microdialysis of Large Molecules. J Pharm Sci 2016; 105:3233-3242. [DOI: 10.1016/j.xphs.2016.08.016] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2016] [Revised: 08/01/2016] [Accepted: 08/22/2016] [Indexed: 12/21/2022]
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Pierce JR, Maples JM, Hickner RC. IL-15 concentrations in skeletal muscle and subcutaneous adipose tissue in lean and obese humans: local effects of IL-15 on adipose tissue lipolysis. Am J Physiol Endocrinol Metab 2015; 308:E1131-9. [PMID: 25921578 PMCID: PMC4469810 DOI: 10.1152/ajpendo.00575.2014] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/08/2014] [Accepted: 04/27/2015] [Indexed: 01/05/2023]
Abstract
Animal/cell investigations indicate that there is a decreased adipose tissue mass resulting from skeletal muscle (SkM) IL-15 secretion (e.g., SkM-blood-adipose tissue axis). IL-15 could regulate fat mass accumulation in obesity via lipolysis, although this has not been investigated in humans. Therefore, the purpose was to examine whether SkM and/or subcutaneous adipose tissue (SCAT) IL-15 concentrations were correlated with SCAT lipolysis in lean and obese humans and determine whether IL-15 perfusion could induce lipolysis in human SCAT. Local SkM and abdominal SCAT IL-15 (microdialysis) and circulating IL-15 (blood) were sampled in lean (BMI: 23.1 ± 1.9 kg/m(2); n = 10) and obese (BMI: 34.7 ± 3.5 kg/m(2); n = 10) subjects at rest/during 1-h cycling exercise. Lipolysis (SCAT interstitial glycerol concentration) was compared against local/systemic IL-15. An additional probe in SCAT was perfused with IL-15 to assess direct lipolytic responses. SkM IL-15 was not different between lean and obese subjects (P = 0.45), whereas SCAT IL-15 was higher in obese vs. lean subjects (P = 0.02) and was correlated with SCAT lipolysis (r = 0.45, P = 0.05). Exercise increased SCAT lipolysis in lean and obese (P < 0.01), but exercise-induced SCAT lipolysis changes were not correlated with exercise-induced SCAT IL-15 changes. Microdialysis perfusion resulting in physiological IL-15 concentrations in the adipose tissue interstitium increased lipolysis in lean (P = 0.04) but suppressed lipolysis in obese (P < 0.01). Although we found no support for a human IL-15 SkM-blood-adipose tissue axis, IL-15 may be produced in/act on the abdominal SCAT depot. The extent to which this autocrine/paracrine IL-15 action regulates human body composition remains unknown.
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Affiliation(s)
- Joseph R Pierce
- Human Performance Laboratory, East Carolina University, Greenville, North Carolina; Departments of Kinesiology and
| | - Jill M Maples
- Human Performance Laboratory, East Carolina University, Greenville, North Carolina; Departments of Kinesiology and
| | - Robert C Hickner
- Human Performance Laboratory, East Carolina University, Greenville, North Carolina; Departments of Kinesiology and Physiology and Center for Health Disparities, East Carolina University, Greenville, North Carolina; and Discipline of Biokinetics, Exercise, and Leisure Sciences, School of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
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Guennoun A, Kazantzis M, Thomas R, Wabitsch M, Tews D, Seetharama Sastry K, Abdelkarim M, Zilberfarb V, Strosberg AD, Chouchane L. Comprehensive molecular characterization of human adipocytes reveals a transient brown phenotype. J Transl Med 2015; 13:135. [PMID: 25925588 PMCID: PMC4438513 DOI: 10.1186/s12967-015-0480-6] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2015] [Accepted: 03/31/2015] [Indexed: 12/30/2022] Open
Abstract
Background Functional brown adipose tissue (BAT), involved in energy expenditure, has recently been detected in substantial amounts in adults. Formerly overlooked BAT has now become an attractive anti-obesity target. Methods and results Molecular characterization of human brown and white adipocytes, using a myriad of techniques including high-throughput RNA sequencing and functional assays, showed that PAZ6 and SW872 cells exhibit classical molecular and phenotypic markers of brown and white adipocytes, respectively. However, the pre-adipocyte cell line SGBS presents a versatile phenotype. A transit expression of classical brown markers such as UCP1 and PPARγ peaked and declined at day 28 post-differentiation initiation. Conversely, white adipocyte markers, including Tcf21, showed reciprocal behavior. Interestingly, leptin levels peaked at day 28 whereas the highest adiponectin mRNA levels were detected at day 14 of differentiation. Phenotypic analysis of the abundance and shape of lipid droplets were consistent with the molecular patterns. Accordingly, the oxidative capacity of SGBS adipocytes peaked on differentiation day 14 and declined progressively towards differentiation day 28. Conclusions Our studies have unveiled a new phenotype of human adipocytes, providing a tool to identify molecular gene expression patterns and pathways involved in the conversion between white and brown adipocytes. Electronic supplementary material The online version of this article (doi:10.1186/s12967-015-0480-6) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Andrea Guennoun
- Laboratory of Genetic Medicine & Immunology, Weill Cornell Medical College in Qatar, P.O. Box 24144, Doha, Qatar.
| | - Melissa Kazantzis
- Center for Diabetes and Metabolic Diseases, The Scripps Research Institute, Florida, USA.
| | - Remy Thomas
- Laboratory of Genetic Medicine & Immunology, Weill Cornell Medical College in Qatar, P.O. Box 24144, Doha, Qatar.
| | - Martin Wabitsch
- Department of Paediatrics and Adolescent Medicine, Division of Pediatric Endocrinology and Diabetology, Ulm, Germany.
| | - Daniel Tews
- Department of Paediatrics and Adolescent Medicine, Division of Pediatric Endocrinology and Diabetology, Ulm, Germany.
| | - Konduru Seetharama Sastry
- Laboratory of Genetic Medicine & Immunology, Weill Cornell Medical College in Qatar, P.O. Box 24144, Doha, Qatar.
| | | | - Vladimir Zilberfarb
- Institut Cochin INSERM U1016, Université Paris 7-Denis-Diderot, Paris, France.
| | | | - Lotfi Chouchane
- Laboratory of Genetic Medicine & Immunology, Weill Cornell Medical College in Qatar, P.O. Box 24144, Doha, Qatar.
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Treviño-Garza C, Mancillas-Adame L, Estrada-Zúñiga CM, Villarreal-Pérez JZ, Villarreal-Martinez L, De la O-Cavazos ME. Measurement of Leptin by RIA Versus MIA in a Population of Healthy Newborns. J Clin Lab Anal 2015; 30:254-7. [PMID: 25821014 DOI: 10.1002/jcla.21845] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2014] [Accepted: 02/23/2015] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND Assays based on multiplex immunoassay (MIA) technology have demonstrated advantages over enzyme-linked immunosorbent assay (ELISA) and radioimmunoassay (RIA). Its acceptance depends on how well it performs in comparison to older techniques. The aim is to compare the results of leptin using RIA versus MIA. METHODS We analyzed 81 samples of umbilical cord blood of healthy term newborns by RIA and MIA. RESULTS The concordance correlation coefficient was 0.158 (95% CI 0.10-0.21). Pearson's correlation coefficient was 0.6651 (95% CI 0.52-0.77; P < 0.0001). In the Bland-Altman plot, concordance is acceptable because most of the measurements are within a mean of ±1.96 SD. CONCLUSIONS As shown by the Bland-Altman plot, there is concordance by both methods, but with a weak correlation.
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Carson BP, McCormack WG, Conway C, Cooke J, Saunders J, O’Connor WT, Jakeman PM. An in vivo microdialysis characterization of the transient changes in the interstitial dialysate concentration of metabolites and cytokines in human skeletal muscle in response to insertion of a microdialysis probe. Cytokine 2015; 71:327-33. [DOI: 10.1016/j.cyto.2014.10.022] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2014] [Revised: 07/18/2014] [Accepted: 10/28/2014] [Indexed: 01/16/2023]
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Weber C, Kammerer D, Streit B, Licht AH. Phenolic excipients of insulin formulations induce cell death, pro-inflammatory signaling and MCP-1 release. Toxicol Rep 2014; 2:194-202. [PMID: 28962351 PMCID: PMC5598374 DOI: 10.1016/j.toxrep.2014.11.019] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Revised: 11/19/2014] [Accepted: 11/27/2014] [Indexed: 01/07/2023] Open
Abstract
Insulin formulations are cytotoxic in vitro. Toxicity is caused by the excipients phenol and m-cresol. Phenolic excipients activate stress kinases and attenuate AKT phosphorylation. Phenolic excipients induce pro-inflammatory responses and MCP-1 release. The toxic effects of excipients might explain inflammation of infusion sites in vivo.
Skin reactions at the infusion site are a common side effect of continuous subcutaneous insulin infusion therapy. We hypothesized that local skin complications are caused by components of commercial insulin formulations that contain phenol or m-cresol as excipients. The toxic potential of insulin solutions and the mechanisms leading to skin reactions were explored in cultured cells. The toxicity of insulin formulations (Apidra, Humalog, NovoRapid, Insuman), excipient-free insulin, phenol and m-cresol was investigated in L929 cells, human adipocytes and monocytic THP-1 cells. The cells were incubated with the test compounds dose- and time-dependently. Cell viability, kinase signaling pathways, monocyte activation and the release of pro-inflammatory cytokines were analyzed. Insulin formulations were cytotoxic in all cell-types and the pure excipients phenol and m-cresol were toxic to the same extent. P38 and JNK signaling pathways were activated by phenolic compounds, whereas AKT phosphorylation was attenuated. THP-1 cells incubated with sub-toxic levels of the test compounds showed increased expression of the activation markers CD54, CD11b and CD14 and secreted the chemokine MCP-1 indicating a pro-inflammatory response. Insulin solutions displayed cytotoxic and pro-inflammatory potential caused by phenol or m-cresol. We speculate that during insulin pump therapy phenol and m-cresol might induce cell death and inflammatory reactions at the infusion site in vivo. Inflammation is perpetuated by release of MCP-1 by activated monocytic cells leading to enhanced recruitment of inflammatory cells. To minimize acute skin complications caused by phenol/m-cresol accumulation, a frequent change of infusion sets and rotation of the infusion site is recommended.
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Key Words
- APC, allophycocyanin
- Adverse effects
- Apidra (PubChem CID: 72941761)
- CCL2, chemokine ligand 2
- CD, cluster of differentiation
- CSII, continuous subcutaneous insulin infusion
- DMSO, dimethyl sulfoxide
- ERK, extracellular signal-regulated kinase
- Humalog (PubChem CID: 16132438)
- IL, interleukin
- IgG, immunoglobulin G
- Inflammation
- Insulin
- Insulin (PubChem CID: 70678557)
- JNK, Jun N-terminal kinase
- MAP kinase, mitogen-activated protein kinase
- MCP-1
- MCP-1, monocyte chemotactic protein-1
- Mip-1α, macrophage inflammatory protein-1alpha
- NovoRapid (PubChem CID: 16132418)
- PE, phycoerythrin
- Phenol (PubChem CID: 996)
- Phenolic excipients
- TNFα, tumor necrosis factor alpha
- XTT, 2,3-bis-(2-methoxy-4-nitro-5-sulfophenyl)-2H-tetrazolium-5-carboxanilide
- m-Cresol (PubChem CID: 342)
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Langkilde A, Andersen O, Henriksen JH, Langberg H, Petersen J, Eugen-Olsen J. Assessment of in situ adipose tissue inflammation by microdialysis. Clin Physiol Funct Imaging 2014; 35:110-9. [PMID: 24494803 DOI: 10.1111/cpf.12134] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2013] [Accepted: 01/09/2014] [Indexed: 12/21/2022]
Abstract
BACKGROUND Inflammation, and specifically adipose tissue (AT) inflammation, is part of the pathophysiology of obesity and HIV-associated lipodystrophy. Local AT protein assessment methods are limited, and AT inflammation studies have therefore primarily examined inflammatory gene expression. We therefore investigated the utility of microdialysis to study in situ AT interstitial inflammatory protein levels. MATERIAL AND METHODS Abdominal subcutaneous AT microdialysis was performed in six healthy men, six HIV-infected men with lipodystrophy and six without lipodystrophy using the internal references (51) Cr-EDTA and (125) I-human serum albumin. We measured 41 inflammatory proteins in microdialysis samples by Luminex technology, as well as systemic levels in 14 subjects. Furthermore, in vitro studies of the internal reference technique for microdialysis recovery of inflammatory proteins were made. RESULTS We detected in situ AT interstitial levels of 14 inflammatory proteins by microdialysis, while the 27 other inflammatory proteins assessed were only detected sporadically. Initial levels of IL-6 and IL-8 were undetectable. Insertion trauma affected IL-1α, IL-6, IL-8, monocyte chemotactic factor (MCP)-1, IP-10, G-CSF, growth-related oncogene (GRO), macrophage-derived chemokine (MDC) and macrophage inflammatory protein (MIP)-1β levels, while fibroblast growth factor (FGF)-2 was not affected. Systemic and AT interstitial levels were poorly correlated. The microdialysis recovery of smaller proteins was higher than for larger, and the internal references improved microdialysis by accounting for variation in perfusion across the membrane. CONCLUSION Interstitial inflammatory proteins can be sampled in situ using microdialysis. Use of internal references improves the microdialysis technique. However, insertion trauma hampers the use of microdialysis to study AT inflammatory levels, except for FGF-2. Still, microdialysis gives unique insight to in situ AT interstitial concentrations.
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Affiliation(s)
- Anne Langkilde
- Clinical Research Centre, Copenhagen University Hospital, Hvidovre, Denmark
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Bajpai G, Simmen RCM, Stenken JA. In vivo microdialysis sampling of adipokines CCL2, IL-6, and leptin in the mammary fat pad of adult female rats. MOLECULAR BIOSYSTEMS 2014; 10:806-12. [PMID: 24457312 DOI: 10.1039/c3mb70308h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Adipocytes from white adipose tissue secrete cytokines and other bioactive proteins which are collectively termed adipokines. Adiposity has been linked with increased breast cancer risk as adipokines secreted by adipocytes significantly affect epithelial cells from which breast cancer arises. Measurement of extracellular adipokine concentrations that would be involved in signaling through mammary tissue is therefore of importance. In this work, microdialysis sampling was used to collect adipokines from the interstitial space of the mammary fat pad of female rats under isoflurane anesthesia. The adipokines CCL2 (MCP-1), leptin and IL-6 were quantified from dialysate samples and compared to total tissue concentrations surrounding the implanted probes. After three hours of microdialysis sampling at 1 μL min(-1), the respective median values for these adipokines in dialysate samples were approximately 175 pg mL(-1) (CCL2), 150 pg mL(-1) (IL-6) and 750 pg mL(-1) (leptin). Adipokine protein levels from dialysates were an order of magnitude lower than levels obtained directly from mammary tissue. However, the adipokine concentrations between excised tissue surrounding the microdialysis sampling probes and control tissue without implants did not differ. This work demonstrates the utility of microdialysis sampling to quantify mammary gland adipokine levels, with relevance to understanding mammary physiology.
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Affiliation(s)
- Geetika Bajpai
- Department of Chemistry and Biochemistry and Program in Cell and Molecular Biology, University of Arkansas, Fayetteville, AR 72701, USA.
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Murdolo G, Bartolini D, Tortoioli C, Piroddi M, Iuliano L, Galli F. Lipokines and oxysterols: novel adipose-derived lipid hormones linking adipose dysfunction and insulin resistance. Free Radic Biol Med 2013; 65:811-820. [PMID: 23954331 DOI: 10.1016/j.freeradbiomed.2013.08.007] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/11/2013] [Revised: 08/07/2013] [Accepted: 08/08/2013] [Indexed: 02/07/2023]
Abstract
The expansion of adipose tissue (AT) is, by definition, a hallmark of obesity. However, not all increases in fat mass are associated with pathophysiological cues. Indeed, whereas a "healthy" fat mass accrual, mainly in the subcutaneous depots, preserves metabolic homeostasis, explaining the occurrence of the metabolically healthy obese phenotype, "unhealthy" AT expansion is importantly associated with insulin resistance/type 2 diabetes and the metabolic syndrome. The development of a dysfunctional adipose organ may find mechanistic explanation in a reduced ability to recruit new and functional (pre)adipocytes from undifferentiated precursor cells. Such a failure of the adipogenic process underlies the "AT expandability" paradigm. The inability of AT to expand further to store excess nutrients, rather than obesity per se, induces a diabetogenic milieu by promoting the overflow and the ectopic deposition of fatty acids in insulin-dependent organs (i.e., lipotoxicity), the secretion of various metabolically detrimental adipose-derived hormones (i.e., adipokines and lipokines), and the occurrence of local and systemic inflammation and oxidative stress. Hitherto, fatty acids (i.e., lipokines) and the oxidation by-products of cholesterol and polyunsaturated fatty acids, such as nonenzymatic oxysterols and reactive aldehyde species, respectively, emerge as key modulators of (pre)adipocyte signaling through Wnt/β-catenin and MAPK pathways and potential regulators of glucose homeostasis. These and other mechanistic insights linking adipose dysfunction, oxidative stress, and impairment of glucose homeostasis are discussed in this review article, which focuses on adipose peroxidation as a potential instigator of, and a putative therapeutic target for, obesity-associated metabolic dysfunctions.
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Affiliation(s)
- Giuseppe Murdolo
- Department of Internal Medicine, Assisi Hospital, I-06081 Assisi, Perugia, Italy; Section of Internal Medicine, Endocrine, and Metabolic Sciences, Italy.
| | - Desirée Bartolini
- Section of Applied Biochemistry and Nutritional Sciences, Department of Internal Medicine, Perugia University, Perugia, Italy
| | | | - Marta Piroddi
- Section of Applied Biochemistry and Nutritional Sciences, Department of Internal Medicine, Perugia University, Perugia, Italy
| | - Luigi Iuliano
- Unit of Vascular Medicine, Department of Medical-Surgical Sciences and Biotechnologies, Sapienza University of Rome, Latina, Italy
| | - Francesco Galli
- Section of Applied Biochemistry and Nutritional Sciences, Department of Internal Medicine, Perugia University, Perugia, Italy
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Fleuren WWM, Linssen MML, Toonen EJM, van der Zon GCM, Guigas B, de Vlieg J, Dokter WHA, Ouwens DM, Alkema W. Prednisolone induces the Wnt signalling pathway in 3T3-L1 adipocytes. Arch Physiol Biochem 2013; 119:52-64. [PMID: 23506355 PMCID: PMC3665230 DOI: 10.3109/13813455.2013.774022] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Synthetic glucocorticoids are potent anti-inflammatory drugs but show dose-dependent metabolic side effects such as the development of insulin resistance and obesity. The precise mechanisms involved in these glucocorticoid-induced side effects, and especially the participation of adipose tissue in this are not completely understood. We used a combination of transcriptomics, antibody arrays and bioinformatics approaches to characterize prednisolone-induced alterations in gene expression and adipokine secretion, which could underlie metabolic dysfunction in 3T3-L1 adipocytes. Several pathways, including cytokine signalling, Akt signalling, and Wnt signalling were found to be regulated at multiple levels, showing that these processes are targeted by prednisolone. These results suggest that mechanisms by which prednisolone induce insulin resistance include dysregulation of wnt signalling and immune response processes. These pathways may provide interesting targets for the development of improved glucocorticoids.
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Affiliation(s)
- Wilco W. M. Fleuren
- CDD, CMBI, NCMLS, Radboud University Medical CentreNijmegenThe Netherlands
- Netherlands Bioinformatics Centre (NBIC)NijmegenThe Netherlands
| | - Margot M. L. Linssen
- Department of Molecular Cell Biology, Leiden University Medical CenterLeidenThe Netherlands
| | - Erik J. M. Toonen
- Department of Medicine, Radboud University Medical CentreNijmegenThe Netherlands
| | | | - Bruno Guigas
- Department of Molecular Cell Biology, Leiden University Medical CenterLeidenThe Netherlands
- Department of Parasitology, Leiden University Medical CenterLeidenThe Netherlands
| | - Jacob de Vlieg
- CDD, CMBI, NCMLS, Radboud University Medical CentreNijmegenThe Netherlands
- Netherlands eScience CenterAmsterdamThe Netherlands
| | | | - D. Margriet Ouwens
- Institute of Clinical Biochemistry and Pathobiochemistry, German Diabetes CenterDüsseldorfGermany
- Department of Endocrinology, Ghent University HospitalGhentBelgium
| | - Wynand Alkema
- CDD, CMBI, NCMLS, Radboud University Medical CentreNijmegenThe Netherlands
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Abstract
Continuous subcutaneous insulin infusion from an insulin pump depends on reliable transfer of the pumped insulin to the subcutaneous insulin depot by means of an insulin infusion set (IIS). Despite their widespread use, the published knowledge about IISs and related issues regarding the impact of placement and wear time on insulin absorption/insulin action is relatively small. We also have to acknowledge that our knowledge is limited with regard to how often patients encounter issues with IISs. Reading pump wearer blogs, for instance, suggests that these are a frequent source of trouble. There are no prospective clinical studies available on current IIS and insulin formulations that provide representative data on the type and frequency of issues with infusion sets. The introduction of new IISs and patch pumps may foster a reassessment of available products and of patient problems related to their use. The aim of this review is to summarize the current knowledge and recommendations about IISs and to highlight potential directions of IIS development in order to make insulin absorption safer and more efficient.
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Kotanen CN, Moussy FG, Carrara S, Guiseppi-Elie A. Implantable enzyme amperometric biosensors. Biosens Bioelectron 2012; 35:14-26. [PMID: 22516142 DOI: 10.1016/j.bios.2012.03.016] [Citation(s) in RCA: 106] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2012] [Revised: 03/06/2012] [Accepted: 03/09/2012] [Indexed: 11/26/2022]
Abstract
The implantable enzyme amperometric biosensor continues as the dominant in vivo format for the detection, monitoring and reporting of biochemical analytes related to a wide range of pathologies. Widely used in animal studies, there is increasing emphasis on their use in diabetes care and management, the management of trauma-associated hemorrhage and in critical care monitoring by intensivists in the ICU. These frontier opportunities demand continuous indwelling performance for up to several years, well in excess of the currently approved seven days. This review outlines the many challenges to successful deployment of chronically implantable amperometric enzyme biosensors and emphasizes the emerging technological approaches in their continued development. The foreign body response plays a prominent role in implantable biotransducer failure. Topics considering the approaches to mitigate the inflammatory response, use of biomimetic chemistries, nanostructured topographies, drug eluting constructs, and tissue-to-device interface modulus matching are reviewed. Similarly, factors that influence biotransducer performance such as enzyme stability, substrate interference, mediator selection and calibration are reviewed. For the biosensor system, the opportunities and challenges of integration, guided by footprint requirements, the limitations of mixed signal electronics, and power requirements, has produced three systems approaches. The potential is great. However, integration along the multiple length scales needed to address fundamental issues and integration across the diverse disciplines needed to achieve success of these highly integrated systems, continues to be a challenge in the development and deployment of implantable amperometric enzyme biosensor systems.
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Affiliation(s)
- Christian N Kotanen
- Center for Bioelectronics, Biosensors and Biochips (C3B), Clemson University Advanced Materials Center, 100 Technology Drive, Anderson, SC 29625, USA; Department of Chemical and Biomolecular Engineering, Clemson University, Clemson, SC 29634, USA
| | - Francis Gabriel Moussy
- Brunel Institute for Bioengineering, Brunel University, Uxbridge, West London, UB83PH, UK
| | - Sandro Carrara
- Department of Electrical Engineering, École Polytechnique Fédérale de Lausanne (EPFL), C ISIM LSI1 - INF 338 (Bâtiment INF) Station 14 CH-1015 Lausanne, Switzerland
| | - Anthony Guiseppi-Elie
- Center for Bioelectronics, Biosensors and Biochips (C3B), Clemson University Advanced Materials Center, 100 Technology Drive, Anderson, SC 29625, USA; Department of Chemical and Biomolecular Engineering, Clemson University, Clemson, SC 29634, USA; Department of Bioengineering, Clemson University, Clemson, SC 29634, USA; Department of Electrical and Computer Engineering, Clemson University, Clemson, SC 29634, USA; ABTECH Scientific, Inc., Biotechnology Research Park, 800 East Leigh Street, Richmond, VA 23219, USA.
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Ikeoka DT, Pachler C, Mader JK, Bock G, Neves AL, Svehlikova E, Feichtner F, Koehler G, Wrighton CJ, Pieber TR, Ellmerer M. Lipid-heparin infusion suppresses the IL-10 response to trauma in subcutaneous adipose tissue in humans. Obesity (Silver Spring) 2011; 19:715-21. [PMID: 21088675 DOI: 10.1038/oby.2010.227] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
An imbalance between pro- and anti-inflammatory cytokine productions in adipose tissue is thought to contribute to chronic, systemic, low-grade inflammation and consequently to an increased risk of cardiovascular complications in obese and type 2 diabetic patients. Nonesterified fatty acids (NEFA), whose serum levels are elevated in such patients, have been shown to interfere with cytokine production in vitro. In order to evaluate the effects of elevated NEFA levels on cytokine production in adipose tissue in vivo we used an 18-gauge open-flow microperfusion (OFM) catheter to induce local inflammation in the subcutaneous adipose tissue (SAT) of healthy volunteers and to sample interstitial fluid (IF) specifically from the inflamed tissue. In two crossover studies, nine subjects received either an intravenous lipid-heparin infusion to elevate circulating NEFA levels or saline over a period of 28 h. The former increased the circulating levels of triglycerides (TGs), NEFA, glucose, and insulin over the study period. NEFA effects on locally induced inflammation were estimated by measuring the levels of a panel adipokines in the OFM probe effluent. Interleukin-6 (IL-6), IL-8, tumor necrosis factor-α (TNF-α) and monocyte chemoattractant protein-1 (MCP-1) levels increased during the study period but were not affected by lipid-heparin infusion. In contrast, the level of IL-10, an anti-inflammatory cytokine, was significantly reduced during the final hour of lipid-heparin infusion (saline: 449.2 ± 105.9 vs. lipid-heparin: 65.4 ± 15.4 pg/ml; P = 0.02). These data provide the first in vivo evidence that elevated NEFA can modulate cytokine production by adipose tissue.
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Affiliation(s)
- Dimas T Ikeoka
- Department of Internal Medicine, Medical University of Graz, Graz, Austria.
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Duo J, Stenken JA. In vitro and in vivo affinity microdialysis sampling of cytokines using heparin-immobilized microspheres. Anal Bioanal Chem 2011; 399:783-93. [PMID: 21052646 PMCID: PMC3864007 DOI: 10.1007/s00216-010-4333-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2010] [Revised: 09/27/2010] [Accepted: 10/12/2010] [Indexed: 12/24/2022]
Abstract
Heparin-immobilized microspheres were included in microdialysis sampling perfusion fluids under both in vitro and in vivo conditions to improve the recovery of different cytokines, acidic fibroblast growth factor, vascular endothelial growth factor, monocyte chemoattractant protein-1 (or CCL2), and regulation upon activation normal T cell express sequence (or CCL5). Different strategies to dissociate captured CCL2 and CCL5 from the immobilized heparin were attempted, and both cytokines could be quantitatively eluted from the beads using a phosphate buffer (pH 7.4) containing 25% (v/v) acetonitrile which did not interfere with the subsequent detection of cytokine using an ELISA assay. Using these heparin-immobilized microspheres, a two to fivefold increase of microdialysis relative recovery (RR) was achieved for the four cytokines from a quiescent solution. Enhanced microdialysis RR of CCL2 using the heparin-immobilized microspheres from microdialysis probes implanted into the peritoneal cavity of a rat was performed to test the in vivo application. This work suggests that the heparin-immobilized microspheres provide an alternative affinity agent to the previously used antibody-immobilized microspheres for enhanced microdialysis sampling of cytokines.
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Affiliation(s)
- Jia Duo
- Department of Chemistry and Chemical Biology, Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, NY 12180, USA
| | - Julie A. Stenken
- Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, AR 72701, USA,
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Ekström M, Halle M, Bjessmo S, Liska J, Kolak M, Fisher R, Eriksson P, Tornvall P. Systemic inflammation activates the nuclear factor-kappaB regulatory pathway in adipose tissue. Am J Physiol Endocrinol Metab 2010; 299:E234-40. [PMID: 20484010 DOI: 10.1152/ajpendo.00115.2010] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Adipose tissue (AT) is a store of energy but also an endocrine organ with the capacity to produce and release proinflammatory mediators into the circulation. The mechanism that may trigger human AT inflammation on a cellular level still remains largely unknown. The aim of this study was to investigate whether an acute systemic inflammation increases AT inflammatory activity, focused on innate immunity. Open heart surgery results in an extensive acute systemic inflammation. Therefore, we investigated the in vivo gene expression and production of inflammatory mediators in omental and subcutaneous AT stimulated by surgery. Biopsies from omental and subcutaneous AT were collected before and after cardiopulmonary bypass. Blood samples were collected at the same time as the AT biopsies and plasma IL-6 levels were measured with ELISA. RT-PCR was used for quantification of relative AT gene expression. To verify the gene expression results on a protein level, we used immunohistochemistry and microdialysis. After surgery, in both omental and subcutaneous AT, there was a strong upregulation of nuclear factor-kappaB-regulated genes, e.g., chemokine ligand-2, E-selectin, IL-1beta, IL-6, IL-8, and Toll-like receptor-2. Immunohistochemistry showed staining for E-selectin associated with a high number of macrophages in close contact with and in the vascular wall. Increased levels of IL-6 were detected in microdialysate from subcutaneous AT. In conclusion, we present the novel finding that this model of inflammation induced a strong inflammatory response in both omental and subcutaneous AT including adhesion of macrophages to an activated endothelium and release of IL-6 from AT interstitium. It can be hypothesized that AT exerts a modulatory effect on innate immunity in humans.
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Affiliation(s)
- Mattias Ekström
- Cardiology Unit and Atherosclerosis Research Unit, Department of Medicine, Karolinska University Hospital, Solna, Stockholm, Sweden.
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Martos-Moreno GÁ, Burgos-Ramos E, Canelles S, Argente J, Barrios V. Evaluation of a multiplex assay for adipokine concentrations in obese children. Clin Chem Lab Med 2010; 48:1439-46. [PMID: 20575747 DOI: 10.1515/cclm.2010.276] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND Multiplexed bead immunoassays allow simultaneous measurement of adipokines and other hormones in small serum samples, although a validation of this technique with classical methods has not been fully established. The purpose of this pilot study was to compare the characteristics of a multiplexed bead immunoassay obesity panel for insulin and various adipokines with classical methods. METHODS A multiplexed bead immunoassay was performed using serum from 20 obese children at baseline and after reducing their body mass index, and in 25 controls. Insulin, adiponectin, leptin, resistin, tumor necrosis factor-α and interleukin-6 measured by multiplexed bead immunoassay were compared with results obtained from commercial immunoassays. Correlation, sensitivity, recovery, linearity, performance and imprecision were established for each analyte. RESULTS The correlation between methods was acceptable for adiponectin, leptin, and insulin with coefficients of 0.75-0.89 (p<0.001). Correlation was weak for resistin (0.54, p<0.001) and poor (r<0.30) for tumor necrosis factor-α and interleukin-6. However, Bland-Altman analysis indicated agreement for insulin methods (bias=-0.07), avoiding direct comparison with other analytes (bias>1.25). The imprecision was similar for both methods (<13%). Multiplexed immunoassay had a broader dynamic range than classical methods (4.94 times). The magnitude of the changes in serum concentrations after weight loss was comparable with both methods for adiponectin, leptin, insulin and resistin, resulting in similar statistical significance. Changes in tumor necrosis factor-α and interleukin-6 were detected by classical immunoassays only (p<0.05). CONCLUSIONS This study demonstrates that multiplexed bead immunoassay is more cost effective for measurement of adipokines present in relatively large amounts, diminishing inter-assay variations and reducing the sample volume.
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Krysiak R, Labuzek K, Okopień B. Effect of atorvastatin and fenofibric acid on adipokine release from visceral and subcutaneous adipose tissue of patients with mixed dyslipidemia and normolipidemic subjects. Pharmacol Rep 2010; 155:156-62. [PMID: 20081249 DOI: 10.1016/j.regpep.2009.03.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2008] [Revised: 03/11/2009] [Accepted: 03/20/2009] [Indexed: 12/21/2022]
Abstract
Because of methodological limitations and conflicting results of studies conducted thus far, the possible involvement of human adipose tissue in pleiotropic effects of statins and fibrates requires better understanding. Samples of visceral and subcutaneous adipose tissue obtained from 23 mixed dyslipidemic patients and 23 normolipidemic subjects were treated in vitro for 48 h with atorvastatin, fenofibric acid or both these agents. Visceral and subcutaneous fat of mixed dyslipidemic patients released more leptin, resistin, interleukin-6, tumor necrosis factor alpha (TNFalpha and plasminogen activator inhibitor-1 (PAI-1), and less adiponectin than respective adipose tissue of patients without lipid abnormalities. In both groups of patients, visceral and subcutaneous tissue varied in the amount of secreted adipokines. In dyslipidemic patients both drugs administered alone affected adipose tissue adiponectin and resistin secretion. Additionally, atorvastatin decreased PAI-1 while fenofibric acid reduced leptin release. A combined administration of atorvastatin and fenofibric acid changed the release of all studied markers by visceral fat but did not affect interleukin-6 and TNFalpha release by subcutaneous tissue. In normolipidemic subjects the effect on adipokine release was more pronounced in visceral fat, in which it was strongest if the drugs were given together. Adipose tissue hormonal activity differs between mixed dyslipidemic and normolipidemic patients and between visceral and subcutaneous adipose tissue. Atorvastatin and fenofibrate exhibit their pleiotropic effects in part by changing the adipokine release by human adipose tissue, regardless of its origin. These effects are stronger in patients with mixed dyslipidemia and are particularly pronounced if atorvastatin and fenofibric acid are given together.
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Affiliation(s)
- Robert Krysiak
- Department of Internal Medicine and Clinical Pharmacology, Medical University of Silesia, Medyków 18, PL 40-752 Katowice, Poland.
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Abstract
White adipose tissue is a mesenchymal tissue that begins developing in the fetus. Classically known for storing the body's fuel reserves, adipose tissue is now recognized as an endocrine organ. As such, the secretions from adipose tissue are known to affect several systems such as the vascular and immune systems and play major roles in metabolism. Numerous studies have shown nutrient or hormonal manipulations can greatly influence adipose tissue development. In addition, the associations between various disease states, such as insulin resistance and cardiovascular disease, and disregulation of adipose tissue seen in epidemiological and intervention studies are great. Evaluation of known adipokines suggests these factors secreted from adipose tissue play roles in several pathologies. As the identification of more adipokines and determination of their role in biological systems, and the interactions between adipocytes and other cells types continues, there is little doubt that we will gain a greater appreciation for a tissue once thought to simply store excess energy.
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Stenken JA, Church MK, Gill CA, Clough GF. How minimally invasive is microdialysis sampling? A cautionary note for cytokine collection in human skin and other clinical studies. AAPS JOURNAL 2009; 12:73-8. [PMID: 19950008 DOI: 10.1208/s12248-009-9163-7] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2009] [Accepted: 11/16/2009] [Indexed: 01/05/2023]
Abstract
It is common to refer to microdialysis as a minimally invasive procedure, likening it to insertion of an artificial capillary. While a comparison of this type allows the process to be easily visualized by those outside the field, it tends to provide a false impression of the localized perturbation of the tissue space that is caused by catheter insertion. With the increased acceptance of microdialysis sampling as a viable in vivo sampling method, many researchers have begun to use the technique to explore inflammatory and immune-mediated diseases in the skin and other organs. Unfortunately, many of the molecules of interest, particularly chemokines and cytokines, are known to be generated during the inflammatory response to wounding and the subsequent cellular events leading to wound repair. With more than 11,000 reports citing the use of microdialysis sampling, only a few researchers have sought to assess the tissue damage that is incurred by probe insertion. For this reason, caution is warranted when collecting these molecules and inferring a role for them in clinical disease states. This commentary seeks to remind the research community of the confounding effects that signaling molecules related to the wounding response will have on clinical studies. Proper controls must be incorporated into all studies in order to assess whether or not particular molecules are truly related to the disease state under investigation or have been generated as part of the tissue response to the wound incurred by microdialysis catheter implantation.
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Affiliation(s)
- Julie A Stenken
- Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701, USA.
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Murdolo G, Hammarstedt A, Schmelz M, Jansson PA, Smith U. Acute hyperinsulinemia differentially regulates interstitial and circulating adiponectin oligomeric pattern in lean and insulin-resistant, obese individuals. J Clin Endocrinol Metab 2009; 94:4508-16. [PMID: 19820029 DOI: 10.1210/jc.2009-0431] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
CONTEXT Hyperinsulinemia emerges as a negative modulator of the circulating high-molecular-weight adiponectin multimers. OBJECTIVES Here we asked whether, in vivo, acute hyperinsulinemia regulates adiponectin formation and oligomeric complex distribution at the transcriptional or posttranslational level. DESIGN Nine lean and nine uncomplicated obese males were studied in the postabsorptive state and during a euglycemic-hyperinsulinemic clamp combined with the microdialysis technique. Subcutaneous abdominal adipose tissue biopsies and interstitial and serum samples were taken at baseline and after the hyperinsulinemia. Adiponectin complexes were characterized by nonheating/nonreducing SDS-PAGE. RESULTS At baseline, serum and interstitial total adiponectin levels were lower (P < 0.01) in obese than in lean subjects primarily due to a reduction of the high-molecular-weight isoforms. After hyperinsulinemia, serum and interstitial total adiponectin was reduced in both groups. The degree of adiponectin reduction was more prominent in interstitial fluid than in serum. Lean individuals showed an equal suppression of the high-, low-, and middle-molecular-weight adiponectin complexes both in serum and in situ (P < 0.01 vs. basal). In obese subjects, despite the lower interstitial adiponectin subfractions, insulin challenge reduced significantly the circulating middle-molecular-weight forms only. At the mRNA level, adiponectin and its receptors 1 and 2, as well as the abundance of the endoplasmic reticulum chaperone proteins ERp44 and Epsilonro1-Lalpha were similar within the groups, before and after the clamp. CONCLUSIONS In human obesity, the impaired adiponectin oligomeric pattern in the circulation is mimicked at the tissue level, and hyperinsulinemia may differentially affect the compartmental distribution of the adiponectin complexes.
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Affiliation(s)
- Giuseppe Murdolo
- Department of Molecular and Clinical Medicine, The Lundberg Laboratory for Diabetes Research, The Sahlgrenska Academy at Göteborg University, Center of Excellence for Cardiovascular and Metabolic Research, SE-413 45 Göteborg, Sweden.
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Clausen TS, Kaastrup P, Stallknecht B. Proinflammatory tissue response and recovery of adipokines during 4 days of subcutaneous large-pore microdialysis. J Pharmacol Toxicol Methods 2009; 60:281-7. [DOI: 10.1016/j.vascn.2009.03.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2009] [Accepted: 03/17/2009] [Indexed: 12/27/2022]
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Clausen TS, Kaastrup P, Stallknecht B. Effect of insulin catheter wear-time on subcutaneous adipose tissue blood flow and insulin absorption in humans. Diabetes Technol Ther 2009; 11:575-80. [PMID: 19764836 DOI: 10.1089/dia.2009.0058] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
BACKGROUND Insertion of an insulin catheter for continuous subcutaneous insulin infusion into the subcutaneous adipose tissue (SAT) causes a tissue trauma that may have consequences for insulin absorption. We evaluated the importance of insulin catheter wear-time on subcutaneous adipose tissue blood flow (ATBF) and absorption of the rapid-acting insulin analog insulin aspart over a period of 4 days. METHODS Teflon insulin catheters (Medtronic, Minneapolis, MN) were inserted into the abdominal SAT of 10 healthy men without diabetes (mean +/- SEM age, 23.0 +/- 1.1 years; body mass index, 22.1 +/- 0.7 kg/m(2)) and connected to an insulin pump delivering a constant rate of isotonic saline for 4 days. Subjects participated in four study days (days 0, 1, 2, and 4) during which ATBF around the catheter tip was measured by (133)Xe clearance and absorption of an insulin aspart bolus (0.1 U/kg) was measured for 4 h. RESULTS ATBF increased from day 0 to day 2 after catheter insertion (2.6 +/- 0.6 to 4.5 +/- 0.8 mL/100 g/min; P = 0.030). By day 4, ATBF had returned to day 0 level. Time to peak plasma insulin aspart concentration after bolus administration decreased with catheter wear-time from 55 +/- 3 min on day 0 to 45 +/- 4 min on day 4 (P = 0.019). Neither peak plasma concentration nor area under the curve of insulin aspart changed significantly. CONCLUSIONS Insertion of a Teflon insulin catheter into the SAT results in increased ATBF and faster absorption of insulin aspart in a period of 4 days without any change in the total amount of insulin aspart absorbed.
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Interstitial concentrations of adipokines in subcutaneous abdominal and femoral adipose tissue. ACTA ACUST UNITED AC 2009; 155:39-45. [DOI: 10.1016/j.regpep.2009.04.010] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2008] [Revised: 02/24/2009] [Accepted: 04/05/2009] [Indexed: 01/04/2023]
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