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Dekens DW, Eisel ULM, Gouweleeuw L, Schoemaker RG, De Deyn PP, Naudé PJW. Lipocalin 2 as a link between ageing, risk factor conditions and age-related brain diseases. Ageing Res Rev 2021; 70:101414. [PMID: 34325073 DOI: 10.1016/j.arr.2021.101414] [Citation(s) in RCA: 43] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2021] [Revised: 07/19/2021] [Accepted: 07/20/2021] [Indexed: 12/12/2022]
Abstract
Chronic (neuro)inflammation plays an important role in many age-related central nervous system (CNS) diseases, including Alzheimer's disease, Parkinson's disease and vascular dementia. Inflammation also characterizes many conditions that form a risk factor for these CNS disorders, such as physical inactivity, obesity and cardiovascular disease. Lipocalin 2 (Lcn2) is an inflammatory protein shown to be involved in different age-related CNS diseases, as well as risk factor conditions thereof. Lcn2 expression is increased in the periphery and the brain in different age-related CNS diseases and also their risk factor conditions. Experimental studies indicate that Lcn2 contributes to various neuropathophysiological processes of age-related CNS diseases, including exacerbated neuroinflammation, cell death and iron dysregulation, which may negatively impact cognitive function. We hypothesize that increased Lcn2 levels as a result of age-related risk factor conditions may sensitize the brain and increase the risk to develop age-related CNS diseases. In this review we first provide a comprehensive overview of the known functions of Lcn2, and its effects in the CNS. Subsequently, this review explores Lcn2 as a potential (neuro)inflammatory link between different risk factor conditions and the development of age-related CNS disorders. Altogether, evidence convincingly indicates Lcn2 as a key constituent in ageing and age-related brain diseases.
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Affiliation(s)
- Doortje W Dekens
- Department of Neurology and Alzheimer Center Groningen, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands; Department of Molecular Neurobiology, Groningen Institute for Evolutionary Life Sciences (GELIFES), University of Groningen, Groningen, the Netherlands
| | - Ulrich L M Eisel
- Department of Molecular Neurobiology, Groningen Institute for Evolutionary Life Sciences (GELIFES), University of Groningen, Groningen, the Netherlands
| | - Leonie Gouweleeuw
- Department of Molecular Neurobiology, Groningen Institute for Evolutionary Life Sciences (GELIFES), University of Groningen, Groningen, the Netherlands
| | - Regien G Schoemaker
- Department of Molecular Neurobiology, Groningen Institute for Evolutionary Life Sciences (GELIFES), University of Groningen, Groningen, the Netherlands
| | - Peter P De Deyn
- Department of Neurology and Alzheimer Center Groningen, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands; Laboratory of Neurochemistry and Behaviour, Biobank, Institute Born-Bunge, University of Antwerp, Antwerp, Belgium
| | - Petrus J W Naudé
- Department of Neurology and Alzheimer Center Groningen, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands; Department of Molecular Neurobiology, Groningen Institute for Evolutionary Life Sciences (GELIFES), University of Groningen, Groningen, the Netherlands; Department of Psychiatry and Mental Health and Neuroscience Institute, Brain Behaviour Unit, University of Cape Town, Cape Town, South Africa.
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2
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Li C, Li Y, Lou L, Han X, Wang H, Huang T, Li C. The interaction between lipocalin 2 and dipyridine ketone hydrazone dithiocarbamte may influence respective function in proliferation and metastasis-related gene expressions in HepG2 cell. J Biol Inorg Chem 2021; 26:123-133. [PMID: 33449164 DOI: 10.1007/s00775-020-01842-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2020] [Accepted: 11/30/2020] [Indexed: 10/22/2022]
Abstract
LCN2 (Lipocalins) was first identified as iron transporter through associating with its siderophores and also involved in many cancer metastases, but its function is still paradoxical. We questioned that whether LCN2 might also associate exogenous iron chelator as does in inherent way and the association may influence their respective function. To address this issue, we investigated the effect of LCN2 on action of DpdtC (2,2'-dipyridine ketone hydrazone dithiocarbamte), an iron chelator in proliferation and metastasis-related gene expression. The results showed that exogenous LCN2 and DpdtC could inhibit growth of HepG2 cells, while the combination treatment enhanced their inhibitory effect both in proliferation and colony formation. This encouraged us to investigate the effect of the interaction on metastasis-related gene expression. The results revealed that both LCN2 and DpdtC impaired the wound healing of HepG2, but the inhibitory effect of DpdtC was significantly enhanced upon association with LCN2. Undergoing epithelium-mesenchymal transition (EMT) is a crucial step for cancer metastasis, LCN2 and DpdtC had opposite effects on EMT markers, the binding of DpdtC to LCN2 significantly weakened the regulation of it (or its iron chelate) on EMT markers. To insight into the interaction between LCN2 and DpdtC-iron, fluorescence titration and molecular docking were performed to obtain the association constant (~ 104 M-1) and thermodynamic parameters (ΔG = - 26.10 kJ/mol). Importantly this study provided evidence that siderophores-loading state of LCN2 may influence its function, which be helpful for understanding the contradictory role of LCN2 in the metastasis of cancer.
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Affiliation(s)
- Cuiping Li
- Department of Molecular Biology and Biochemistry, Xinxiang Medical University, Xinxiang, 453003, Henan, People's Republic of China
| | - Yongli Li
- Department of Histology and Embryology, Sanquan College of Xinxiang Medical University, Xinxiang, 453003, Henan, People's Republic of China
| | - Liying Lou
- Department of Molecular Biology and Biochemistry, Xinxiang Medical University, Xinxiang, 453003, Henan, People's Republic of China
| | - Xinyi Han
- Department of Molecular Biology and Biochemistry, Xinxiang Medical University, Xinxiang, 453003, Henan, People's Republic of China
| | - Huihui Wang
- Department of Molecular Biology and Biochemistry, Xinxiang Medical University, Xinxiang, 453003, Henan, People's Republic of China
| | - Tengfei Huang
- Department of Molecular Biology and Biochemistry, Xinxiang Medical University, Xinxiang, 453003, Henan, People's Republic of China
| | - Changzheng Li
- Department of Molecular Biology and Biochemistry, Xinxiang Medical University, Xinxiang, 453003, Henan, People's Republic of China. .,Experimental Teaching Center of Biology and Basic Medical Sciences, Sanquan College of Xinxiang Medical University, Xinxiang, 453003, Henan, People's Republic of China.
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Gigon L, Yousefi S, Karaulov A, Simon HU. Mechanisms of toxicity mediated by neutrophil and eosinophil granule proteins. Allergol Int 2021; 70:30-38. [PMID: 33277190 DOI: 10.1016/j.alit.2020.11.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Accepted: 11/13/2020] [Indexed: 12/14/2022] Open
Abstract
Neutrophils and eosinophils are granulocytes which are characterized by the presence of granules in the cytoplasm. Granules provide a safe storage site for granule proteins that play important roles in the immune function of granulocytes. Upon granulocytes activation, diverse proteins are released from the granules into the extracellular space and contribute to the fight against infections. In this article, we describe granule proteins of both neutrophils and eosinophils able to kill pathogens and review their anticipated mechanism of antimicrobial toxicity. It should be noted that an excess of granules protein release can lead to tissue damage of the host resulting in chronic inflammation and organ dysfunction.
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Koh SA, Lee KH. Function of hepatocyte growth factor in gastric cancer proliferation and invasion. Yeungnam Univ J Med 2020; 37:73-78. [PMID: 32074717 PMCID: PMC7142030 DOI: 10.12701/yujm.2019.00437] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Accepted: 01/28/2020] [Indexed: 11/06/2022] Open
Abstract
Cancer incidence has been increasing steadily and is the leading cause of mortality worldwide. Gastric cancer is still most common malignancy in Korea. Cancer initiation and progression are multistep processes involving various growth factors and their ligands. Among these growth factors, we have studied hepatocyte growth factor (HGF), which is associated with cell proliferation and invasion, leading to cancer and metastasis, especially in gastric cancer. We explored the intercellular communication between HGF and other surface membrane receptors in gastric cancer cell lines. Using complimentary deoxyribonucleic acid microarray technology, we found new genes associated with HGF in the stomach cancer cell lines, NUGC-3 and MKN-28, and identified their function within the HGF pathway. The HGF/N-methyl-N’-nitroso-guanidine human osteosarcoma transforming gene (c-MET) axis interacts with several molecules including E-cadherin, urokinase plasminogen activator, KiSS-1, Jun B, and lipocalin-2. This pathway may affect cell invasion and metastasis or cell apoptosis and is therefore associated with tumorigenesis and metastasis in gastric cancer.
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Affiliation(s)
- Sung Ae Koh
- Department of Hematology-Oncology, Yeungnam University College of Medicine, Daegu, Korea
| | - Kyung Hee Lee
- Department of Hematology-Oncology, Yeungnam University College of Medicine, Daegu, Korea
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Huang X, Slavkovic S, Song E, Botta A, Mehrazma B, Lento C, Johnson PE, Sweeney G, Wilson DJ. A Unique Conformational Distortion Mechanism Drives Lipocalin 2 Binding to Bacterial Siderophores. ACS Chem Biol 2020; 15:234-242. [PMID: 31613081 DOI: 10.1021/acschembio.9b00820] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Lcn2 is a host defense protein induced via the innate immune response to sequester iron-loaded bacterial siderophores. However, excess or prolonged elevation of Lcn2 levels can induce adverse cellular effects, including oxidative stress and inflammation. In this work, we use Hydrogen-Deuterium eXchange (HDX) and Isothermal Titration Calorimetry (ITC) to characterize the binding interaction between Lcn2 and siderophores enterobactin and 2,3-DHBA, in the presence and absence of iron. Our results indicate a rare "Type II" interaction in which binding of siderophores drives the protein conformational equilibrium toward an unfolded state. Linking our molecular model to cellular assays, we demonstrate that this "distorted binding mode" facilitates a deleterious cellular accumulation of reactive oxygen species that could represent the molecular origin of Lcn2 pathology. These results add important insights into mechanisms of Lcn2 action and have implications in Lcn2-mediated effects including inflammation.
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Li D, Yan Sun W, Fu B, Xu A, Wang Y. Lipocalin-2-The myth of its expression and function. Basic Clin Pharmacol Toxicol 2019; 127:142-151. [PMID: 31597008 DOI: 10.1111/bcpt.13332] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2019] [Accepted: 09/19/2019] [Indexed: 01/01/2023]
Abstract
Lipocalin-2 is a functional biomarker for acute and chronic kidney diseases, heart failure and obesity-related medical complications. It is rapidly induced in epithelial cells under stress conditions, but constitutively produced from pre-adipocytes and mature adipocytes. Measuring the lipocalin-2 levels represents an effective approach for risk prediction, patient stratification and disease management. Nevertheless, due to ligand-binding, post-translational modification and protein-protein interaction, lipocalin-2 exists as multiple variants that elicit different pathophysiological functions. To characterize the specific structure-functional relationships of lipocalin-2 variants is critical for the development of biomarker assays with sufficient precision and reliability. Moreover, identifying the pathological forms of lipocalin-2 will provide new therapeutic targets and treatment approaches for obesity-related complications.
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Affiliation(s)
- Dahui Li
- The State Key Laboratory of Pharmaceutical Biotechnology and Department of Pharmacology and Pharmacy, The University of Hong Kong, Hong Kong SAR, China
| | - Wai Yan Sun
- The State Key Laboratory of Pharmaceutical Biotechnology and Department of Pharmacology and Pharmacy, The University of Hong Kong, Hong Kong SAR, China
| | - Bowen Fu
- The State Key Laboratory of Pharmaceutical Biotechnology and Department of Pharmacology and Pharmacy, The University of Hong Kong, Hong Kong SAR, China
| | - Aimin Xu
- The State Key Laboratory of Pharmaceutical Biotechnology and Department of Pharmacology and Pharmacy, The University of Hong Kong, Hong Kong SAR, China
| | - Yu Wang
- The State Key Laboratory of Pharmaceutical Biotechnology and Department of Pharmacology and Pharmacy, The University of Hong Kong, Hong Kong SAR, China
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Mancuso P, Bouchard B. The Impact of Aging on Adipose Function and Adipokine Synthesis. Front Endocrinol (Lausanne) 2019; 10:137. [PMID: 30915034 PMCID: PMC6421296 DOI: 10.3389/fendo.2019.00137] [Citation(s) in RCA: 169] [Impact Index Per Article: 33.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/22/2018] [Accepted: 02/13/2019] [Indexed: 02/04/2023] Open
Abstract
During the last 40 years, there has been a world-wide increase in both the prevalence of obesity and an increase in the number of persons over the age of 60 due to a decline in deaths from infectious disease and the nutrition transition in low and middle income nations. While the increase in the elderly population indicates improvements in global public health, this population may experience a diminished quality of life due to the negative impacts of obesity on age-associated inflammation. Aging alters adipose tissue composition and function resulting in insulin resistance and ectopic lipid storage. A reduction in brown adipose tissue activity, declining sex hormones levels, and abdominal adipose tissue expansion occur with advancing years through the redistribution of lipids from the subcutaneous to the visceral fat compartment. These changes in adipose tissue function and distribution influence the secretion of adipose tissue derived hormones, or adipokines, that promote a chronic state of low-grade systemic inflammation. Ultimately, obesity accelerates aging by enhancing inflammation and increasing the risk of age-associated diseases. The focus of this review is the impact of aging on adipose tissue distribution and function and how these effects influence the elaboration of pro and anti-inflammatory adipokines.
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Affiliation(s)
- Peter Mancuso
- Department of Nutritional Sciences, School of Public Health, University of Michigan, Ann Arbor, MI, United States
- Graduate Program in Immunology, School of Public Health, University of Michigan, Ann Arbor, MI, United States
- *Correspondence: Peter Mancuso
| | - Benjamin Bouchard
- Department of Epidemiology, School of Public Health, University of Michigan, Ann Arbor, MI, United States
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Amersfoort J, Schaftenaar FH, Douna H, van Santbrink PJ, Kröner MJ, van Puijvelde GHM, Quax PHA, Kuiper J, Bot I. Lipocalin-2 contributes to experimental atherosclerosis in a stage-dependent manner. Atherosclerosis 2018; 275:214-224. [PMID: 29960897 DOI: 10.1016/j.atherosclerosis.2018.06.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Revised: 05/15/2018] [Accepted: 06/08/2018] [Indexed: 12/01/2022]
Abstract
BACKGROUND AND AIMS Lipocalin-2 (Lcn2) is a glycoprotein which can be secreted by immune cells. Several studies in humans have suggested Lcn2 can be used as a biomarker for the detection of unstable atherosclerotic lesions, partly as it is known to interact with MMP-9. METHODS In this study, we generated Ldlr-/-Lcn2-/- mice to assess the functional role of Lcn2 in different stages of atherosclerosis. Atherosclerotic lesions were characterized through histological analysis and myeloid cell populations were examined using flow cytometry. RESULTS We show that Ldlr-/-Lcn2-/- mice developed larger atherosclerotic lesions during earlier stages of atherosclerosis and had increased circulating Ly6Chi inflammatory monocytes compared to Ldlr-/- mice. Advanced atherosclerotic lesions from Ldlr-/-Lcn2-/- mice had decreased necrotic core area, suggesting Lcn2 deficiency may affect lesion stability. Furthermore, MMP-9 activity was diminished in plaques from Ldlr-/-Lcn2-/- mice. CONCLUSIONS Altogether, these findings suggest that Lcn2 deficiency promotes lesion growth in earlier stages of the disease while it decreases MMP-9 activity and necrotic core size in advanced atherosclerosis.
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Affiliation(s)
- J Amersfoort
- Division of Biotherapeutics, LACDR, Leiden University, Einsteinweg 55, 2333CC, Leiden, The Netherlands.
| | - F H Schaftenaar
- Division of Biotherapeutics, LACDR, Leiden University, Einsteinweg 55, 2333CC, Leiden, The Netherlands
| | - H Douna
- Division of Biotherapeutics, LACDR, Leiden University, Einsteinweg 55, 2333CC, Leiden, The Netherlands
| | - P J van Santbrink
- Division of Biotherapeutics, LACDR, Leiden University, Einsteinweg 55, 2333CC, Leiden, The Netherlands
| | - M J Kröner
- Division of Biotherapeutics, LACDR, Leiden University, Einsteinweg 55, 2333CC, Leiden, The Netherlands
| | - G H M van Puijvelde
- Division of Biotherapeutics, LACDR, Leiden University, Einsteinweg 55, 2333CC, Leiden, The Netherlands
| | - P H A Quax
- Department of Surgery, Leiden University Medical Center, Albinusdreef 2, 2333ZA, Leiden, The Netherlands; Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, Leiden, The Netherlands
| | - J Kuiper
- Division of Biotherapeutics, LACDR, Leiden University, Einsteinweg 55, 2333CC, Leiden, The Netherlands
| | - I Bot
- Division of Biotherapeutics, LACDR, Leiden University, Einsteinweg 55, 2333CC, Leiden, The Netherlands
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9
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Abstract
Lipocalin 2 (Lcn2), an innate immune protein, has emerged as a critical iron regulatory protein during physiological and inflammatory conditions. As a bacteriostatic factor, Lcn2 obstructs the siderophore iron-acquiring strategy of bacteria and thus inhibits bacterial growth. As part of host nutritional immunity, Lcn2 facilitates systemic, cellular, and mucosal hypoferremia during inflammation, in addition to stabilizing the siderophore-bound labile iron pool. In this review, we summarize recent advances in understanding the interaction between Lcn2 and iron, and its effects in various inflammatory diseases. Lcn2 exerts mostly a protective role in infectious and inflammatory bowel diseases, whereas both beneficial and detrimental functions have been documented in neurodegenerative diseases, metabolic syndrome, renal disorders, skin disorders, and cancer. Further animal and clinical studies are necessary to unveil the multifaceted roles of Lcn2 in iron dysregulation during inflammation and to explore its therapeutic potential for treating inflammatory diseases.
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Affiliation(s)
- Xia Xiao
- Department of Nutritional Sciences, The Pennsylvania State University, University Park, Pennsylvania 16802;
| | - Beng San Yeoh
- Department of Nutritional Sciences, The Pennsylvania State University, University Park, Pennsylvania 16802;
| | - Matam Vijay-Kumar
- Department of Nutritional Sciences, The Pennsylvania State University, University Park, Pennsylvania 16802; .,Department of Medicine, The Pennsylvania State University Medical Center, Hershey, Pennsylvania 17033
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Neutrophil gelatinase-associated lipocalin levels are U-shaped in the Ludwigshafen Risk and Cardiovascular Health (LURIC) study-Impact for mortality. PLoS One 2017; 12:e0171574. [PMID: 28207778 PMCID: PMC5312954 DOI: 10.1371/journal.pone.0171574] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Accepted: 01/22/2017] [Indexed: 12/30/2022] Open
Abstract
INTRODUCTION Neutrophil gelatinase-associated lipocalin (NGAL) is a glycoprotein released by damaged renal tubular cells and mature neutrophils. It is elevated in kidney injury, but also in patients with coronary artery disease (CAD) and myocardial infarction. We investigated the prognostic value of NGAL for total and cardiovascular mortality in patients undergoing coronary angiography without history of renal insufficiency at inclusion into the study. PARTICIPANTS The LURIC study is an ongoing prospective cohort study of patients referred for coronary angiography and is designed to evaluate determinants of cardiovascular health. RESULTS NGAL was determined in plasma of 2997 persons (mean age: 62.7 years; 69.7% men) with a follow up for 10 years. 2358 patients suffered from CAD and 638 did not-these patients served as controls. Stable CAD was found in 1408 and unstable CAD in 950 patients. Death rate from cardiovascular events and all causes was highest in patients within the 4th quartile of NGAL (≥56 ng/ml, p<0.001 vs third quartile), even after adjustment for age and gender. According to multivariable-adjusted Cox analysis adjusting for well-known cardiovascular risk factors, as well as lipid lowering therapy, angiographic CAD, and C-reactive protein we found patients in the highest NGAL quartile being at increased risk for cardiovascular (hazard ratio (HR) 1.33, 95%CI 1.05-1.67, p = 0.016) and all cause mortality (HR 1.29 95%CI 1.07-1.55, p = 0.007) compared to those in the third quartile. The lowest risk was seen in the third quartile of NGAL (41-56 ng/ml) suggesting a U-shaped relationship between NGAL and mortality. Further adjustment for creatinine abrogated the predictive effect of NGAL. However, the 3rd and 4th quartiles of NGAL were significantly associated with higher neutrophil counts, which were associated with CAD, non-ST elevation and ST-elevation myocardial infarction (p<0.05). CONCLUSIONS Plasma NGAL concentrations are mainly derived from neutrophils and do not predict mortality independent of renal function.
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Abstract
Adipose tissue has traditionally been defined as connective tissue that stores excess calories in the form of triacylglycerol. However, the physiologic functions attributed to adipose tissue are expanding, and it is now well established that adipose tissue is an endocrine gland. Among the endocrine factors elaborated by adipose tissue are the adipokines; hormones, similar in structure to cytokines, produced by adipose tissue in response to changes in adipocyte triacylglycerol storage and local and systemic inflammation. They inform the host regarding long-term energy storage and have a profound influence on reproductive function, blood pressure regulation, energy homeostasis, the immune response, and many other physiologic processes. The adipokines possess pro- and anti-inflammatory properties and play a critical role in integrating systemic metabolism with immune function. In calorie restriction and starvation, proinflammatory adipokines decline and anti-inflammatory adipokines increase, which informs the host of energy deficits and contributes to the suppression of immune function. In individuals with normal metabolic status, there is a balance of pro- and anti-inflammatory adipokines. This balance shifts to favor proinflammatory mediators as adipose tissue expands during the development of obesity. As a consequence, the proinflammatory status of adipose tissue contributes to a chronic low-grade state of inflammation and metabolic disorders associated with obesity. These disturbances are associated with an increased risk of metabolic disease, type 2 diabetes, cardiovascular disease, and many other pathological conditions. This review focuses on the impact of energy homeostasis on the adipokines in immune function.
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Affiliation(s)
- Peter Mancuso
- Department of Nutritional Sciences, School of Public Health, University of Michigan, Ann Arbor, MI, USA
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12
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Bao GH, Ho CT, Barasch J. The Ligands of Neutrophil Gelatinase-Associated Lipocalin. RSC Adv 2015; 5:104363-104374. [PMID: 27617081 DOI: 10.1039/c5ra18736b] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Neutrophil gelatinase associated lipocalin (NGAL), was originally identified in neutrophil granules as a heterodimer complex with gelatinase B (matrix metalloproteinase 9, MMP9), but more recently has been found to be secreted by damaged epithelial cells. Ngal is a member of the lipocalin family and subsequently named as lipocalin 2 on the basis of structural similarity with other members of the lipocalin family and its potential association with hydrophobic retinol and cholesterol oleate more strongly than their hydrophilic counterparts. In 2002, a landmark paper suggested that Ngal is a bacteriostatic agent which blocks iron acquisition by interacting with a number of bacterial siderophores, especially enterobactin. Since then, more siderophore-carrying functions have been reported than the possibility of hydrophobic ligand transport. In this setting, Ngal was renamed Siderocalin. Functions of siderocalin include not only bacteriostatic activity but potentially as a mediator of cell growth and differentiation; some of these functions appear to be referable to the holo siderocalin:siderophore:iron complex and recent work suggests that metabolic products may act as mammalian siderophores bound by Ngal. While still speculative, it may be that the mammalian siderophores can establish the missing link between Ngal and a number of its functions in vivo. This review provides an overview of the discoveries of the different ligands of Ngal and consequently related functions. Hydrophobic ligands, bacterial siderophores as well as their modified structures (synthetic siderophores), and mammalian siderophores are summarized.
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Affiliation(s)
- Guan-Hu Bao
- State Key Laboratory of Tea Plant Biology and Utilization, Biotechnology Building 214, Anhui Agricultural University, China
| | - Chi-Tang Ho
- State Key Laboratory of Tea Plant Biology and Utilization, Biotechnology Building 214, Anhui Agricultural University, China; Department of Food Science, Rutgers University, 65 Dudley Road, New Brunswick, New Jersey 08901-8520, United States
| | - Jonathan Barasch
- College of Physicians and Surgeons of Columbia University, New York, USA
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13
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Ferreira AC, Dá Mesquita S, Sousa JC, Correia-Neves M, Sousa N, Palha JA, Marques F. From the periphery to the brain: Lipocalin-2, a friend or foe? Prog Neurobiol 2015; 131:120-36. [PMID: 26159707 DOI: 10.1016/j.pneurobio.2015.06.005] [Citation(s) in RCA: 115] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Revised: 06/23/2015] [Accepted: 06/28/2015] [Indexed: 01/08/2023]
Abstract
Lipocalin-2 (LCN2) is an acute-phase protein that, by binding to iron-loaded siderophores, acts as a potent bacteriostatic agent in the iron-depletion strategy of the immune system to control pathogens. The recent identification of a mammalian siderophore also suggests a physiological role for LCN2 in iron homeostasis, specifically in iron delivery to cells via a transferrin-independent mechanism. LCN2 participates, as well, in a variety of cellular processes, including cell proliferation, cell differentiation and apoptosis, and has been mostly found up-regulated in various tissues and under inflammatory states, being its expression regulated by several inducers. In the central nervous system less is known about the processes involving LCN2, namely by which cells it is produced/secreted, and its impact on cell proliferation and death, or in neuronal plasticity and behaviour. Importantly, LCN2 recently emerged as a potential clinical biomarker in multiple sclerosis and in ageing-related cognitive decline. Still, there are conflicting views on the role of LCN2 in pathophysiological processes, with some studies pointing to its neurodeleterious effects, while others indicate neuroprotection. Herein, these various perspectives are reviewed and a comprehensive and cohesive view of the general function of LCN2, particularly in the brain, is provided.
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Affiliation(s)
- Ana C Ferreira
- Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, Braga, Portugal; ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - Sandro Dá Mesquita
- Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, Braga, Portugal; ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - João C Sousa
- Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, Braga, Portugal; ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - Margarida Correia-Neves
- Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, Braga, Portugal; ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - Nuno Sousa
- Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, Braga, Portugal; ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - Joana A Palha
- Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, Braga, Portugal; ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - Fernanda Marques
- Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, Braga, Portugal; ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal.
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14
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Wu G, Li H, Zhou M, Fang Q, Bao Y, Xu A, Jia W. Mechanism and clinical evidence of lipocalin-2 and adipocyte fatty acid-binding protein linking obesity and atherosclerosis. Diabetes Metab Res Rev 2014; 30:447-56. [PMID: 24214285 DOI: 10.1002/dmrr.2493] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/24/2013] [Accepted: 10/29/2013] [Indexed: 12/19/2022]
Abstract
Obesity is considered to be a chronic inflammatory state in which the dysfunction of adipose tissue plays a central role. The adipokines, which are cytokines secreted by adipose tissue, are key links between obesity and related diseases such as metabolic syndrome and atherosclerosis. LCN2 and A-FABP, both of which are major adipokines predominantly produced in adipose tissue, have recently been shown to be pivotal modulators of vascular function. However, different adipokines modulate the development of atherosclerosis in distinctive manners, which are partly attributable to their unique regulatory mechanisms and functions. This review highlights recent advances in the understanding of the role of two adipokines in mediating chronic inflammation and the pathogenesis of atherosclerosis.
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Affiliation(s)
- Guangyu Wu
- Department of Endocrinology and Metabolism, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai Clinical Center for Diabetes, Shanghai Diabetes Institute, Shanghai Key Laboratory of Diabetes Mellitus, Shanghai Key Clinical Center for Metabolic Disease, China; Department of Medicine, Medical School of Soochow University, Suzhou, China
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15
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Lindberg S, Jensen JS, Mogelvang R, Pedersen SH, Galatius S, Flyvbjerg A, Magnusson NE. Plasma neutrophil gelatinase-associated lipocalinin in the general population: association with inflammation and prognosis. Arterioscler Thromb Vasc Biol 2014; 34:2135-42. [PMID: 24969771 DOI: 10.1161/atvbaha.114.303950] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
OBJECTIVE Neutrophil gelatinase-associated lipocalin (NGAL) is a glycoprotein stored in granules of neutrophil leukocytes participating in inflammatory and atherosclerotic processes and possibly plaque rupture. Despite the putative role of NGAL in atherosclerosis and acute myocardial infarction, human studies of plasma NGAL are still limited. APPROACH AND RESULTS We prospectively followed 5599 randomly selected men and women from the community in the fourth Copenhagen Heart Study. Plasma NGAL was measured at study entry. Participants were followed for 10 years. During follow-up, 20% died (n=1120) and 15% (n=884) developed a major adverse cardiovascular event. Plasma NGAL associated strongly with all inflammatory markers (high-sensitivity C-reactive protein, total leukocyte count, neutrophil count) and inversely with estimated glomerular filtration rate (all, P<0.001). Multivariate analysis identified neutrophil leukocyte count as the main determinant of plasma NGAL. During follow-up, participants with increasing NGAL had increased risk of all-cause mortality and major adverse cardiovascular event (both, P<0.001). Even after adjustment for confounding risk factors by Cox regression analysis, NGAL remained an independent predictor of both all-cause mortality and major adverse cardiovascular event. When added to the Framingham risk score, NGAL improved c-statistics and correctly reclassified ≈15% into more appropriate risk groups. In comparison with high-sensitivity C-reactive protein, when both markers were added to the Framingham risk score, NGAL conferred 3× to 4× the risk. CONCLUSIONS Plasma NGAL is strongly associated with inflammation in the general population. NGAL independently associated with 10-year outcome, and when added to the Framingham risk score, NGAL both improves c-statistics and correctly reclassifies participants into more accurate risk categories.
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Affiliation(s)
- Søren Lindberg
- From the Department of Cardiology P, Gentofte University Hospital, Copenhagen, Denmark (S.L., J.S.J., R.M., S.H.P., S.G.); Copenhagen City Heart Study, Bispebjerg University Hospital, Copenhagen, Denmark (S.L., J.S.J., R.M.); Institute of Clinical Medicine, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark (J.S.J.); The Medical Research Laboratory, Department of Clinical Medicine, Aarhus University, Aarhus, Denmark (A.F., N.E.M.); and Department of Endocrinology and Internal Medicine, Aarhus University Hospital, Aarhus, Denmark (A.F., N.E.M.).
| | - Jan S Jensen
- From the Department of Cardiology P, Gentofte University Hospital, Copenhagen, Denmark (S.L., J.S.J., R.M., S.H.P., S.G.); Copenhagen City Heart Study, Bispebjerg University Hospital, Copenhagen, Denmark (S.L., J.S.J., R.M.); Institute of Clinical Medicine, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark (J.S.J.); The Medical Research Laboratory, Department of Clinical Medicine, Aarhus University, Aarhus, Denmark (A.F., N.E.M.); and Department of Endocrinology and Internal Medicine, Aarhus University Hospital, Aarhus, Denmark (A.F., N.E.M.)
| | - Rasmus Mogelvang
- From the Department of Cardiology P, Gentofte University Hospital, Copenhagen, Denmark (S.L., J.S.J., R.M., S.H.P., S.G.); Copenhagen City Heart Study, Bispebjerg University Hospital, Copenhagen, Denmark (S.L., J.S.J., R.M.); Institute of Clinical Medicine, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark (J.S.J.); The Medical Research Laboratory, Department of Clinical Medicine, Aarhus University, Aarhus, Denmark (A.F., N.E.M.); and Department of Endocrinology and Internal Medicine, Aarhus University Hospital, Aarhus, Denmark (A.F., N.E.M.)
| | - Sune H Pedersen
- From the Department of Cardiology P, Gentofte University Hospital, Copenhagen, Denmark (S.L., J.S.J., R.M., S.H.P., S.G.); Copenhagen City Heart Study, Bispebjerg University Hospital, Copenhagen, Denmark (S.L., J.S.J., R.M.); Institute of Clinical Medicine, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark (J.S.J.); The Medical Research Laboratory, Department of Clinical Medicine, Aarhus University, Aarhus, Denmark (A.F., N.E.M.); and Department of Endocrinology and Internal Medicine, Aarhus University Hospital, Aarhus, Denmark (A.F., N.E.M.)
| | - Søren Galatius
- From the Department of Cardiology P, Gentofte University Hospital, Copenhagen, Denmark (S.L., J.S.J., R.M., S.H.P., S.G.); Copenhagen City Heart Study, Bispebjerg University Hospital, Copenhagen, Denmark (S.L., J.S.J., R.M.); Institute of Clinical Medicine, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark (J.S.J.); The Medical Research Laboratory, Department of Clinical Medicine, Aarhus University, Aarhus, Denmark (A.F., N.E.M.); and Department of Endocrinology and Internal Medicine, Aarhus University Hospital, Aarhus, Denmark (A.F., N.E.M.)
| | - Allan Flyvbjerg
- From the Department of Cardiology P, Gentofte University Hospital, Copenhagen, Denmark (S.L., J.S.J., R.M., S.H.P., S.G.); Copenhagen City Heart Study, Bispebjerg University Hospital, Copenhagen, Denmark (S.L., J.S.J., R.M.); Institute of Clinical Medicine, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark (J.S.J.); The Medical Research Laboratory, Department of Clinical Medicine, Aarhus University, Aarhus, Denmark (A.F., N.E.M.); and Department of Endocrinology and Internal Medicine, Aarhus University Hospital, Aarhus, Denmark (A.F., N.E.M.)
| | - Nils E Magnusson
- From the Department of Cardiology P, Gentofte University Hospital, Copenhagen, Denmark (S.L., J.S.J., R.M., S.H.P., S.G.); Copenhagen City Heart Study, Bispebjerg University Hospital, Copenhagen, Denmark (S.L., J.S.J., R.M.); Institute of Clinical Medicine, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark (J.S.J.); The Medical Research Laboratory, Department of Clinical Medicine, Aarhus University, Aarhus, Denmark (A.F., N.E.M.); and Department of Endocrinology and Internal Medicine, Aarhus University Hospital, Aarhus, Denmark (A.F., N.E.M.)
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16
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Chung TW, Choi HJ, Kim CH, Jeong HS, Ha KT. Lipocalin-2 elicited by advanced glycation end-products promotes the migration of vascular smooth muscle cells. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2013; 1833:3386-3395. [PMID: 24149112 DOI: 10.1016/j.bbamcr.2013.10.011] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2013] [Revised: 10/11/2013] [Accepted: 10/14/2013] [Indexed: 12/11/2022]
Abstract
Advanced glycation end-products (AGEs) play key roles in the development of diabetic vascular complications by activating the proliferation and migration of vascular smooth muscle cells. Here, we identified an increase of the migratory properties of human aortic smooth muscle cells (HASMC) through AGE-induced expression of lipocalin-2 (LCN2). Because the AGE-elicited expression of LCN2 was diminished by an antibody against the AGE receptor (RAGE), diphenylene iodonium (DPI), N-acetyl cysteine, LY294002, and SP600125, we suggest that AGEs enhance the expression of LCN2 via a RAGE-NADPH oxidase-reactive oxygen species pathway, leading to the phosphorylation of PI3K-Akt and JNK in HASMCs. In addition, a chromatin immunoprecipitation assay and promoter assay revealed that CCAAT/enhancer binding protein β is crucial for AGE-induced expression of LCN2. However, any other AGE-related signaling pathway, including ERK1/2, p38, NF-κB, and AP-1, did not affect the AGE- induced expression of LCN2. Knockdown of LCN2 expression by shRNA showed that AGE-elicited LCN2 expression enhanced the invasive and migratory properties of HASMCs, but showed no effect on cell proliferation. Considering the importance of HASMC migration in the development of atherosclerosis, our study provides a novel insight into diabetic vascular complications.
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MESH Headings
- Acute-Phase Proteins/genetics
- Acute-Phase Proteins/metabolism
- Base Sequence
- CCAAT-Enhancer-Binding Protein-beta/metabolism
- Cell Movement/drug effects
- Cell Proliferation/drug effects
- Chromatin Immunoprecipitation
- Gene Knockdown Techniques
- Glycation End Products, Advanced/pharmacology
- Humans
- JNK Mitogen-Activated Protein Kinases/metabolism
- Lipocalin-2
- Lipocalins/genetics
- Lipocalins/metabolism
- Models, Biological
- Molecular Sequence Data
- Muscle, Smooth, Vascular/cytology
- Myocytes, Smooth Muscle/cytology
- Myocytes, Smooth Muscle/drug effects
- Myocytes, Smooth Muscle/metabolism
- Phosphatidylinositol 3-Kinases/metabolism
- Promoter Regions, Genetic/genetics
- Proto-Oncogene Proteins/genetics
- Proto-Oncogene Proteins/metabolism
- Proto-Oncogene Proteins c-akt/metabolism
- RNA, Small Interfering/metabolism
- Reactive Oxygen Species/metabolism
- Receptor for Advanced Glycation End Products
- Receptors, Immunologic/metabolism
- Signal Transduction/drug effects
- Transcriptional Activation/drug effects
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Affiliation(s)
- Tae-Wook Chung
- Division of Applied Medicine, School of Korean Medicine, Pusan National University, Yangsan, Gyeongsangnam-do 626-870, Republic of Korea; Department of Molecular and Cellular Glycobiology, College of Natural Science, Sungkyunkwan University, Suwon, Kyungki-do 440-746, Republic of Korea
| | - Hee-Jung Choi
- Division of Applied Medicine, School of Korean Medicine, Pusan National University, Yangsan, Gyeongsangnam-do 626-870, Republic of Korea
| | - Cheorl-Ho Kim
- Department of Molecular and Cellular Glycobiology, College of Natural Science, Sungkyunkwan University, Suwon, Kyungki-do 440-746, Republic of Korea
| | - Han-Sol Jeong
- Division of Applied Medicine, School of Korean Medicine, Pusan National University, Yangsan, Gyeongsangnam-do 626-870, Republic of Korea
| | - Ki-Tae Ha
- Division of Applied Medicine, School of Korean Medicine, Pusan National University, Yangsan, Gyeongsangnam-do 626-870, Republic of Korea.
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17
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Chen W, Ayala-Orozco C, Biswal NC, Perez-Torres C, Bartels M, Bardhan R, Stinnet G, Liu XD, Ji B, Deorukhkar A, Brown LV, Guha S, Pautler RG, Krishnan S, Halas NJ, Joshi A. Targeting pancreatic cancer with magneto-fluorescent theranostic gold nanoshells. Nanomedicine (Lond) 2013; 9:1209-22. [PMID: 24063415 DOI: 10.2217/nnm.13.84] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
AIM We report a magneto-fluorescent theranostic nanocomplex targeted to neutrophil gelatinase-associated lipocalin (NGAL) for imaging and therapy of pancreatic cancer. MATERIALS & METHODS Gold nanoshells resonant at 810 nm were encapsulated in silica epilayers doped with iron oxide and the near-infrared (NIR) dye indocyanine green, resulting in theranostic gold nanoshells (TGNS), which were subsequently conjugated with antibodies targeting NGAL in AsPC-1-derived xenografts in nude mice. RESULTS Anti-NGAL-conjugated TGNS specifically targeted pancreatic cancer cells in vitro and in vivo providing contrast for both NIR fluorescence and T2-weighted MRI with higher tumor contrast than can be obtained using long-circulating, but nontargeted, PEGylated nanoparticles. The nanocomplexes also enabled highly specific cancer cell death via NIR photothermal therapy in vitro. CONCLUSION TGNS with embedded NIR and magnetic resonance contrasts can be specifically targeted to pancreatic cancer cells with expression of early disease marker NGAL, and enable molecularly targeted imaging and photothermal therapy.
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Affiliation(s)
- Wenxue Chen
- Division of Molecular Imaging, Department of Radiology, Baylor College of Medicine, Mail: BCM 360, One Baylor Plaza, Houston, TX 77030, USA and Department of Diagnostic Imaging, The Fourth Hospital of Hebei Medical University/Hebei Province Tumor Hospital, 12 Jiankang Road, Shijiazhuang, Hebei Province 050011, China
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18
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Xiao Y, Xu A, Hui X, Zhou P, Li X, Zhong H, Tang W, Huang G, Zhou Z. Circulating lipocalin-2 and retinol-binding protein 4 are associated with intima-media thickness and subclinical atherosclerosis in patients with type 2 diabetes. PLoS One 2013; 8:e66607. [PMID: 23799122 PMCID: PMC3684582 DOI: 10.1371/journal.pone.0066607] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2013] [Accepted: 05/07/2013] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND The lipocalin family proteins, including lipocalin-2 and retinol-binding protein 4 (RBP4), are adipokines closely associated with obesity-related metabolic disorders. In this study, we evaluated the association of serum lipocalin-2 and RBP4 with intima-media thickness (IMT) and subclinical atherosclerosis in type 2 diabetic patients. METHODS AND RESULTS Serum levels of lipocalin-2 and RBP4 were measured in 284 type 2 diabetic patients. Subclinical atherosclerosis was assessed by IMT at carotid, femoral and iliac arteries with ultrasound. Patients with subclinical atherosclerosis showed significantly higher circulating concentrations of lipocalin-2 and RBP4 when compared to those without [112.9 (86.4 to 202.1) µg/L versus 77.2(55.0-150.4) µg/L, 37.1(32.3-40.8) mg/L versus 23.2(20.1-29.2) mg/L, respectively; P = 0.002, P<0.001, respectively]. Moreover, positive correlations were observed between carotid IMT and lipocalin-2 (r = 0.170, P = 0.018) or RBP4 (r = 0.132, P = 0.040), femoral IMT and lipocalin-2 (r = 0.160, P = 0.027), as well as between iliac IMT and RBP4 (r = 0.241, P<0.001). Multiple logistic regression analysis further demonstrated that these two adipokines were independent risk factors for subclinical atherosclerosis in type 2 diabetes. CONCLUSION Circulating levels of lipocalin-2 and RBP4 are positively correlated with carotid IMT and subclinical atherosclerosis in type 2 diabetes, which suggests a potential role of these two lipid-binding chaperones in the pathogenesis of vascular complications of diabetes.
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Affiliation(s)
- Yang Xiao
- Diabetes Center, the Second Xiangya Hospital, and Institute of Metabolism and Endocrinology, Key Laboratory of Diabetes Immunology, Ministry of Education, Central South University, Hunan Key Laboratory of Medical Epigenomics, Changsha, Hunan, China
- Research Center of Heart, Brain, Hormone, and Healthy Aging, the University of Hong Kong, Hong Kong, China
| | - Aimin Xu
- Department of Medicine, the University of Hong Kong, Hong Kong, China
- Department of Pharmacology and Pharmacy, the University of Hong Kong, Hong Kong, China
- Research Center of Heart, Brain, Hormone, and Healthy Aging, the University of Hong Kong, Hong Kong, China
| | - Xiaoyan Hui
- Department of Medicine, the University of Hong Kong, Hong Kong, China
| | - Pengcheng Zhou
- Department of Medicine, the University of Hong Kong, Hong Kong, China
| | - Xing Li
- Diabetes Center, the Second Xiangya Hospital, and Institute of Metabolism and Endocrinology, Key Laboratory of Diabetes Immunology, Ministry of Education, Central South University, Hunan Key Laboratory of Medical Epigenomics, Changsha, Hunan, China
| | - Hui Zhong
- Diabetes Center, the Second Xiangya Hospital, and Institute of Metabolism and Endocrinology, Key Laboratory of Diabetes Immunology, Ministry of Education, Central South University, Hunan Key Laboratory of Medical Epigenomics, Changsha, Hunan, China
| | - Weili Tang
- Diabetes Center, the Second Xiangya Hospital, and Institute of Metabolism and Endocrinology, Key Laboratory of Diabetes Immunology, Ministry of Education, Central South University, Hunan Key Laboratory of Medical Epigenomics, Changsha, Hunan, China
| | - Gan Huang
- Diabetes Center, the Second Xiangya Hospital, and Institute of Metabolism and Endocrinology, Key Laboratory of Diabetes Immunology, Ministry of Education, Central South University, Hunan Key Laboratory of Medical Epigenomics, Changsha, Hunan, China
| | - Zhiguang Zhou
- Diabetes Center, the Second Xiangya Hospital, and Institute of Metabolism and Endocrinology, Key Laboratory of Diabetes Immunology, Ministry of Education, Central South University, Hunan Key Laboratory of Medical Epigenomics, Changsha, Hunan, China
- * E-mail:
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19
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Chen X, Jia X, Qiao J, Guan Y, Kang J. Adipokines in reproductive function: a link between obesity and polycystic ovary syndrome. J Mol Endocrinol 2013; 50:R21-37. [PMID: 23335807 DOI: 10.1530/jme-12-0247] [Citation(s) in RCA: 71] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Polycystic ovary syndrome (PCOS) is the most common endocrinopathy associated with infertility and metabolic disorder in women of reproductive age. Dysfunction of adipose tissue has been implicated in the pathophysiology of PCOS. Increasing evidence shows that the dysregulated expression of adipokines, the secreted products of adipose tissue, plays an important role in the pathology of PCOS. Here, we review the role of several identified adipokines that may act as a link between obesity and PCOS. PCOS also reciprocally influences the profile of adipokines. Insight into the underlying mechanisms will help better understand the pathology of PCOS and identify new therapeutic targets of this syndrome.
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Affiliation(s)
- Xinwang Chen
- Department of Physiology and Pathophysiology, Peking University Health Science Center, Beijing 100191, China
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20
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Jang Y, Lee JH, Wang Y, Sweeney G. Emerging clinical and experimental evidence for the role of lipocalin-2 in metabolic syndrome. Clin Exp Pharmacol Physiol 2012; 39:194-9. [PMID: 21689137 DOI: 10.1111/j.1440-1681.2011.05557.x] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The inflammatory state, which is associated with the current pandemic of obesity, has been established as an important contributing pathogenic factor to the increased prevalence of the so-called metabolic syndrome. Many studies have focused on the contribution of various adipokines to this phenomenon, and in the present study, we provide an update on the emerging evidence that the pro-inflammatory factor, lipocalin-2, might influence various aspects of metabolic syndrome. Previous reports indicate a positive correlation of serum lipocalin-2 with fasting glucose, the homeostasis model assessment of insulin resistance index, and the inflammatory marker high-sensitivity C-reactive protein, even after adjustment for body mass index, suggesting that it is an independent risk factor for insulin resistance, diabetes, and inflammation. Direct analysis of lipocalin-2 action now also shows effects on peripheral metabolism and on cardiovascular function. A better understanding of how lipocalin-2 is regulated locally and systemically is crucial for adding to our understanding of the pathogenesis of metabolic syndrome, and to uncover potential new avenues for therapeutic approaches.
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Affiliation(s)
- Yangsoo Jang
- Division of Cardiology, Severance Cardiovascular Hospital, Yonsei University College of Medicine Department of Food and Nutrition, College of Human Ecology, Yonsei University, Seoul, Korea
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21
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Wang Y. Small lipid-binding proteins in regulating endothelial and vascular functions: focusing on adipocyte fatty acid binding protein and lipocalin-2. Br J Pharmacol 2012; 165:603-21. [PMID: 21658023 PMCID: PMC3315034 DOI: 10.1111/j.1476-5381.2011.01528.x] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2011] [Revised: 05/26/2011] [Accepted: 05/31/2011] [Indexed: 12/13/2022] Open
Abstract
UNLABELLED Dysregulated production of adipokines from adipose tissue plays a critical role in the development of obesity-associated cardiovascular abnormalities. A group of adipokines, including adipocyte fatty acid binding protein (A-FABP) and lipocalin-2, possess specific lipid-binding activity and are up-regulated in obese human subjects and animal models. They act as lipid chaperones to promote lipotoxicity in endothelial cells and cause endothelial dysfunction under obese conditions. However, different small lipid-binding proteins modulate the development of vascular complications in distinctive manners, which are partly attributed to their specialized structural features and functionalities. By focusing on A-FABP and lipocalin-2, this review summarizes recent advances demonstrating the causative roles of these newly identified adipose tissue-derived lipid chaperones in obesity-related endothelial dysfunction and cardiovascular complications. The specific lipid-signalling mechanisms mediated by these two proteins are highlighted to support their specialized functions. In summary, A-FABP and lipocalin-2 represent potential therapeutic targets to design drugs for preventing vascular diseases associated with obesity. LINKED ARTICLES This article is part of a themed section on Fat and Vascular Responsiveness. To view the other articles in this section visit http://dx.doi.org/10.1111/bph.2012.165.issue-3.
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Affiliation(s)
- Yu Wang
- Department of Pharmacology and Pharmacy, Li Ka Shing Faculty of Medicine, University of Hong Kong, Hong Kong.
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22
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Abstract
Recent studies have documented the association of mesenteric lymphatic route with adult respiratory distress syndrome and multiple organ failure after hemorrhagic shock. However, the mediators and mechanisms of the toxic effects of mesenteric lymph remain unclear. This study aimed to identify mediators or biomarkers in the mesenteric lymph through comparative proteomic analysis. Fourteen mature male Sprague-Dawley rats were randomly divided and subjected to trauma (laparotomy) plus hemorrhagic shock or trauma plus sham shock. Mesenteric lymph samples were collected before shock and at 3 h after resuscitation from hemorrhagic shock (or sham shock). To investigate changes in proteome profiles between preshock and 3-h postshock (or 3-h post-sham shock) mesenteric lymph samples, two-dimensional gel electrophoresis and matrix-assisted laser desorption ionization time-of-flight mass spectrometry were performed. We found a more than 2-fold change in abundance of 31 protein spots in the lymph samples. Mass spectrometry analyses identified 12 distinct proteins. Four proteins were consistently upregulated in the 3-h postshock lymph samples, including serum albumin precursor, two isoforms of cytoplasmic actin, complement C3 precursor, and major urinary protein precursor. Two proteins, including haptoglobin and one unidentified protein, were consistently downregulated. The deregulation of these proteins was confirmed by Western blots. Most of these altered proteins are functionally implicated in tissue inflammation. The findings of this study provide a starting point for investigating the functions of these proteins in hemorrhagic shock-induced lung injury and hold great promise for the development of potential therapeutic interventions.
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23
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te Boekhorst BC, Bovens SM, Hellings WE, van der Kraak PH, van de Kolk KW, Vink A, Moll FL, van Oosterhout MF, de Vries JP, Doevendans PA, Goumans MJ, de Kleijn DP, van Echteld CJ, Pasterkamp G, Sluijter JP. Molecular MRI of murine atherosclerotic plaque targeting NGAL: a protein associated with unstable human plaque characteristics. Cardiovasc Res 2010; 89:680-8. [PMID: 21030534 DOI: 10.1093/cvr/cvq340] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
AIMS Neutrophil gelatinase-associated lipocalin (NGAL) is an effector molecule of the innate immune system. One of its actions is the prolongation of matrix metalloproteinase-9 (MMP-9) activity by the formation of a degradation-resistant NGAL/MMP-9 complex. We studied NGAL in human atherosclerotic lesions and we examined whether NGAL could act as a target for molecular imaging of atherosclerotic plaques. METHODS AND RESULTS Increased levels of NGAL and the NGAL/MMP-9 complex were associated with high lipid content, high number of macrophages, high interleukin-6 (IL-6) and IL-8 levels, and low smooth muscle cell content in human atherosclerotic lesions obtained during carotid endarterectomy (n= 122). Moreover, plaque levels of NGAL tended to be higher when intra-plaque haemorrhage (IPH) or luminal thrombus was present (n= 77) than without the presence of IPH or thrombus (n= 30). MMP-9 and -8 activities were strongly related to NGAL levels. The enhancement on magnetic resonance (MR) images of the abdominal aorta of ApoE(-/-)/eNOS(-/-) mice was observed at 72 h after injection of NGAL/24p3-targeted micelles. The specificity of these results was validated by histology, and co-localization of micelles, macrophages, and NGAL/24p3 was observed. CONCLUSION NGAL is highly expressed in atheromatous human plaques and associated with increased MMP-9 activity. NGAL can be detected in murine atherosclerotic arteries using targeted high-resolution MR imaging. Therefore, we conclude that NGAL might serve as a novel imaging target for the detection of high-risk plaques.
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Affiliation(s)
- Bernard C te Boekhorst
- Experimental Cardiology Laboratory, Department of Cardiology, University Medical Center Utrecht, Heidelberglaan 100, Room G02.523, 3584 CX Utrecht, The Netherlands.
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Metabolic endotoxemia and saturated fat contribute to circulating NGAL concentrations in subjects with insulin resistance. Int J Obes (Lond) 2009; 34:240-9. [PMID: 19949414 DOI: 10.1038/ijo.2009.242] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
OBJECTIVE Lipocalin-2 (neutrophil gelatinase-associated lipocalin, NGAL) is an innate immune system protein that has been linked to insulin resistance and obesity, but the mechanisms behind these associations are poorly known. We hypothesized that endotoxin (lipopolysaccharide, LPS) and fat intake were in the background of these associations. DESIGN We studied four cohorts: (1) a cross-sectional study in 194 subjects; (2) the changes in NGAL concentration induced by diet and weight loss in 36 obese women (with circadian rhythm in 8 of them); (3) the effects of acute fat intake on circulating NGAL concentration in 42 morbidly obese subjects; and (4) LPS-induced NGAL secretion ex vivo (whole blood and adipose tissue explants). RESULTS Serum NGAL concentration was significantly associated with fasting triglycerides and LPS-binding protein in patients with type 2 diabetes. In obese subjects, the intake of saturated fatty acids was the factor that best explained the variance of NGAL changes after weight loss (contributing independently to 14% of NGAL variance). In fact, weight loss significantly changed the circadian rhythm of NGAL. The acute increase in circulating NGAL after fat overload was significantly associated with fasting insulin (r=0.52, P<0.001), homeostasis model assessment of insulin resistance (HOMA-IR) (r=0.36, P=0.02) and post-load triglyceride concentrations (r=0.38, P=0.018). LPS-induced NGAL secretion from adipose tissue explants did not change significantly, but LPS led to a significant increase in NGAL concentration in the whole blood obtained from patients with type 2 diabetes. CONCLUSION Metabolic endotoxemia and saturated fat might contribute to circulating NGAL concentration in patients with insulin resistance.
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Organogold complexes probe a large β-barrel cavity for human serum α1-acid glycoprotein. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2008; 1784:1106-14. [DOI: 10.1016/j.bbapap.2008.03.015] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2008] [Revised: 03/20/2008] [Accepted: 03/24/2008] [Indexed: 11/22/2022]
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Zhang J, Wu Y, Zhang Y, Leroith D, Bernlohr DA, Chen X. The role of lipocalin 2 in the regulation of inflammation in adipocytes and macrophages. Mol Endocrinol 2008; 22:1416-26. [PMID: 18292240 DOI: 10.1210/me.2007-0420] [Citation(s) in RCA: 233] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Adipose tissue-derived cytokines (adipokines) are associated with the development of inflammation and insulin resistance. However, which adipokine(s) mediate this linkage and the mechanisms involved during obesity is poorly understood. Through proteomics and microarray screening, we recently identified lipocalin 2 (LCN 2) as an adipokine that potentially connects obesity and its related adipose inflammation. Herein we show that the levels of LCN2 mRNA are dramatically increased in adipose tissue and liver of ob/ob mice and primary adipose cells isolated from Zucker obese rats, and thiazolidinedione administration reduces LCN2 expression. Interestingly, addition of LCN2 induces mRNA levels of peroxisome proliferator-activated receptor-gamma (PPARgamma) and adiponectin. Reducing LCN2 gene expression causes decreased expression of PPARgamma and adiponectin, slightly reducing insulin-stimulated Akt2 phosphorylation at Serine 473 in 3T3-L1 adipocytes. LCN2 administration to 3T3-L1 cells attenuated TNFalpha-effect on glucose uptake, expression of PPARgamma, insulin receptor substrate-1, and glucose transporter 4, and secretion of adiponectin and leptin. When added to macrophages, LCN2 suppressed lipopolysaccharide-induced cytokine production. Our data suggest that LCN2, as a novel autocrine and paracrine adipokine, acts as an antagonist to the effect of inflammatory molecules on inflammation and secretion of adipokines.
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Affiliation(s)
- Jinhui Zhang
- Department of Food Science and Nutrition, University of Minnesota, St. Paul, Minnesota 55108-1038, USA
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Hoo RL, Yeung DC, Lam KS, Xu A. Inflammatory biomarkers associated with obesity and insulin resistance: a focus on lipocalin-2 and adipocyte fatty acid-binding protein. Expert Rev Endocrinol Metab 2008; 3:29-41. [PMID: 30743783 DOI: 10.1586/17446651.3.1.29] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Obesity is an important risk factor for a cluster of metabolic and cardiovascular diseases, including insulin resistance, Type 2 diabetes, nonalcoholic fatty liver disease and atherosclerosis. Systemic low-grade inflammation, characterized by elevated circulating concentrations of proinflammatory factors, has recently been proposed to be a key mediator that links obesity with its medical complications. Adipose tissue is now recognized as the major contributor to systemic inflammation associated with obesity. As obesity develops, adipose tissue is infiltrated with activated macrophages. The 'inflamed' adipose tissue secretes a large number of proinflammatory adipokines and/or cytokines, which can act either in an autocrine manner to perpetuate local inflammation or in an endocrine manner to induce insulin resistance and endothelial dysfunction. In this review, we summarize recent advances in several newly identified adipose tissue-derived inflammatory factors, with the focus on lipocalin-2 and adipocyte fatty acid-binding protein (A-FABP). Both lipocalin-2 and A-FABP possess lipid-binding properties and are important integrators of metabolic and inflammatory pathways. A growing body of evidence from experimental, epidemiological and genetic studies suggests that both lipocalin-2 and A-FABP represent a novel class of serum biomarkers for risk prediction and therapeutic intervention of obesity-related medical complications.
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Affiliation(s)
- Ruby Lc Hoo
- a University of Hong Kong, Department of Medicine and Research Centre of Heart, Brain, Hormone and Healthy Aging, Li Ka Shing Faculty of Medicine, L8-40, 21 Sassoon Road, Hong Kong, China.
| | - Dennis Cy Yeung
- b University of Hong Kong, Department of Medicine and Research Centre of Heart, Brain, Hormone and Healthy Aging, Li Ka Shing Faculty of Medicine, L8-40, 21 Sassoon Road, Hong Kong, China.
| | - Karen Sl Lam
- c University of Hong Kong, Department of Medicine and Research Centre of Heart, Brain, Hormone and Healthy Aging, Li Ka Shing Faculty of Medicine, L8-40, 21 Sassoon Road, Hong Kong, China.
| | - Aimin Xu
- d University of Hong Kong, Department of Medicine and Research Centre of Heart, Brain, Hormone and Healthy Aging, Li Ka Shing Faculty of Medicine, L8-40, 21 Sassoon Road, Hong Kong, China.
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Aigner F, Maier HT, Schwelberger HG, Wallnöfer EA, Amberger A, Obrist P, Berger T, Mak TW, Maglione M, Margreiter R, Schneeberger S, Troppmair J. Lipocalin-2 regulates the inflammatory response during ischemia and reperfusion of the transplanted heart. Am J Transplant 2007; 7:779-88. [PMID: 17391123 DOI: 10.1111/j.1600-6143.2006.01723.x] [Citation(s) in RCA: 80] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Ischemia and reperfusion (IR) are known to negatively affect early allograft function following solid organ transplantation. Lipocalin-2 (Lcn-2) has been described as a marker and potential positive modulator of acute inflammation during these processes. Using a heterotopic murine heart transplant model we previously found that IR resulted in a pronounced upregulation of Lcn-2 mRNA in the heart at 12 (22.7-fold increase) and 24 h (9.8-fold increase) of reperfusion. We now confirm this increase at the protein level and provide evidence for infiltrating polymorphonuclear cells as the primary source of Lcn-2 protein. Lcn-2 levels are increased 6.6-fold at 12 h, 11.4-fold at 24 h and 6.4 fold at 48 h after reperfusion. In Lcn-2(-/-) grafts the number of infiltrating granulocytes is reduced by 54% (p < 0.05) at 2 h, 79% (p < 0.01) at 12 h, 72% (p < 0.01) at 24 h and 52% (p < 0.01) at 48 h after reperfusion compared to Lcn-2(+/+) grafts, without any differences in cardiomyocyte apoptosis. These data suggest a function of Lcn-2 in the initiation of the inflammatory response. Moreover, an increase in Lcn-2 is not only restricted to the transplanted heart, but is also observed in the kidney, hinting at a possible involvement of Lcn-2 in the systemic response to IR.
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Affiliation(s)
- F Aigner
- Department of General and Transplant Surgery and Daniel-Swarovski-Research Laboratory, Innsbruck Medical University, Austria.
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Sunil VR, Patel KJ, Nilsen-Hamilton M, Heck DE, Laskin JD, Laskin DL. Acute endotoxemia is associated with upregulation of lipocalin 24p3/Lcn2 in lung and liver. Exp Mol Pathol 2007; 83:177-87. [PMID: 17490638 PMCID: PMC3954125 DOI: 10.1016/j.yexmp.2007.03.004] [Citation(s) in RCA: 80] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2007] [Accepted: 03/14/2007] [Indexed: 02/07/2023]
Abstract
Acute endotoxemia is associated with production of acute phase proteins which regulate inflammatory responses to tissue injury. Consistent with DNA microarray experiments, we found that acute endotoxemia, induced by administration of lipopolysaccharide (LPS) to mice (1 mg/kg) or rats (5 mg/kg), resulted in increased expression of the hepatic acute phase protein, lipocalin 24p3, which was evident within 4 h and persisted for 24-48 h. Increases in 24p3 expression were also observed in the lung after LPS administration, as well as in isolated liver and lung macrophages, and Type II alveolar epithelial cells. The actions of LPS are dependent, in part, on Toll-like receptor (TLR) proteins. Macrophages from C3H/HeJ mice, which possess a nonfunctional TLR-4, expressed low levels of 24p3 mRNA when compared to cells from control C3H/OuJ mice. Whereas LPS administration increased 24p3 expression in lung and liver macrophages from control C3H/OuJ mice, minimal effects were observed in TLR-4 mutant mice demonstrating that TLR-4 is important in regulating 24p3 expression during acute endotoxemia. Promoters for genes encoding lipocalin proteins including 24p3 contain consensus sequences for transcription factors including NF-kappaB, and C/EBP. Acute endotoxemia resulted in NF-kappaB nuclear binding activity in both alveolar macrophages and Type II cells. In contrast, C/EBP activation was evident only in Type II cells, suggesting differential effects of LPS on these cell types. These data suggest that the acute phase response to acute endotoxemia involves induction of 24p3 in both the lung and liver. This protein may be important in restoring tissue homeostasis following LPS-induced injury.
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Affiliation(s)
- Vasanthi R Sunil
- Department of Pharmacology and Toxicology, Rutgers University, Piscataway, NJ 08854, USA.
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Bu DX, Hemdahl AL, Gabrielsen A, Fuxe J, Zhu C, Eriksson P, Yan ZQ. Induction of neutrophil gelatinase-associated lipocalin in vascular injury via activation of nuclear factor-kappaB. THE AMERICAN JOURNAL OF PATHOLOGY 2007; 169:2245-53. [PMID: 17148685 PMCID: PMC1762469 DOI: 10.2353/ajpath.2006.050706] [Citation(s) in RCA: 111] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Neutrophil gelatinase-associated lipocalin (NGAL) has recently emerged as an important modulator of cell homeostasis. Elevated plasma NGAL levels, possibly because of activation of blood leukocytes, are associated with atherosclerosis. However, little is known about induction of NGAL expression in blood vessels. Using a rat carotid artery injury model, we found that NGAL was highly induced in the intima after angioplasty but was attenuated by adenovirus-mediated expression of a dominant-negative mutant of inhibitor of nuclear factor (NF)-kappaB kinase beta (dnIKKbeta). Expression of NGAL mRNA and protein was also up-regulated in an NF-kappaB-dependent manner in rat and human vascular smooth muscle cells (SMCs) in response to interleukin-1beta stimulation. Rat SMC-produced NGAL was present as mono- and homomeric forms in the cytosol and in a complex containing matrix metalloproteinase-9 (MMP-9) after secretion. In agreement with levels of NGAL, proteolytic activity of MMP-9 was markedly high in the intima of injured vessels and in the culture supernatant of activated intimal SMCs but was reduced in the vessels transduced with dnIKKbeta. The present study reveals a previously unrecognized vascular response to an-gioplastic injury, characterized by NF-kappaB-dependent expression of NGAL in vascular SMCs. Further-more, SMC-produced NGAL interacts with MMP-9, a mechanism by which NGAL may modulate MMP-9 proteolytic activity in the vascular repair process.
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Affiliation(s)
- De-xiu Bu
- Center for Molecular Medicine, Department of Medicine, King Gustaf V Research Institute, Karolinska University Hospital, 171 76, Stockholm, Sweden
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Lee HJ, Lee EK, Lee KJ, Hong SW, Yoon Y, Kim JS. Ectopic expression of neutrophil gelatinase-associated lipocalin suppresses the invasion and liver metastasis of colon cancer cells. Int J Cancer 2006; 118:2490-7. [PMID: 16381001 DOI: 10.1002/ijc.21657] [Citation(s) in RCA: 85] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Neutrophil gelatinase-associated lipocalin (NGAL), also known as lipocalin 2, is a 25-kDa lipocalin initially purified from neutrophil granules. It is thought to play a role in regulating cellular growth since its expression is highly upregulated in a variety of proliferative cells such as cancer cells. However, experimental evidence showing a clear causal relationship between NGAL expression and the proliferation of tumor cells is lacking. Here, we found NGAL expression in highly and poorly metastatic colon cancer cell lines of the same genetic origin correlated inversely with the metastatic potential of these cells, which suggests NGAL participates in the metastatic process. To explore the role NGAL plays in tumor growth and metastasis, the KM12SM human colon cancer cell line, which is highly metastatic while showing decreased NGAL expression, was genetically manipulated to overexpress NGAL. The effects of this on tumor growth and liver metastasis were then analyzed using experimental animal models established by injecting BALB/c nude mice with tumor cells subcutaneously or intrasplenically. Ectopic expression of NGAL in the colon cancer cells had little effect on the growth and viability of the tumor cells both in vitro and in vivo. However, NGAL expression not only suppressed the ability of the colon carcinoma cells to invade Matrigel in vitro, it also substantially inhibited liver metastasis in an experimental animal model. Collectively, these results indicate that NGAL may be a candidate metastasis suppressor in colon cancer cells.
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Affiliation(s)
- Ho-Jeong Lee
- New Biologics Team, Mogam Biotechnology Research Institute, Yongin-city, Republic of Korea
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Hemdahl AL, Gabrielsen A, Zhu C, Eriksson P, Hedin U, Kastrup J, Thorén P, Hansson GK. Expression of neutrophil gelatinase-associated lipocalin in atherosclerosis and myocardial infarction. Arterioscler Thromb Vasc Biol 2005; 26:136-42. [PMID: 16254208 DOI: 10.1161/01.atv.0000193567.88685.f4] [Citation(s) in RCA: 249] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
OBJECTIVE Neutrophil gelatinase-associated lipocalin (NGAL) modulates the activity of matrix metalloproteinase (MMP) 9, an important mediator of vascular remodeling and plaque instability in atherosclerosis. This study aimed to analyze the expression of NGAL in atherosclerotic plaques and myocardial infarction (MI). METHODS AND RESULTS Atherosclerotic apolipoprotein E (apoE)(-/-) x low-density lipoprotein receptor (LDLR)(-/-) and C57BL/6J control mice were exposed to brief hypoxic stress (10 minutes of 10% oxygen). Expression of the mouse NGAL homolog (24p3) and MMP-9 was analyzed 48 hours later by quantitative RT-PCR, immunohistochemistry, and zymography. Hypoxic stress increased NGAL/24p3 mRNA in the cardiac vasculature. NGAL/24p3 was also increased in atherosclerotic plaques of apolipoprotein E(-/-) x LDLR(-/-) mice compared with C57BL/6J mice. Mice developing MI exhibited the highest plaque mRNA expression of NGAL/24p3 and MMP-9. Zymography revealed strong proteolytic activity in areas rich in 24p3 and MMP-9 protein. Immunohistochemistry performed on human carotid endarterectomy specimens and control tissue from the internal mammary artery showed colocalization of MMP-9 and NGAL with macrophages in the atherosclerotic plaques. CONCLUSIONS NGAL/24p3 is increased in atherosclerotic plaques and MI. Colocalization with MMP-9 in areas with high-proteolytic activity suggests a role for NGAL/24p3 in modulating the MMP-9-mediated remodeling of plaques and infarcted hearts.
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Affiliation(s)
- Anne-Louise Hemdahl
- Center for Molecular Medicine, Department of Medicine, Karolinska Hospital, Stockholm, Sweden
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Sack RA, Sathe S, Beaton AR, Bogart B, Lew G. Changes in the diurnal pattern of the distribution of gelatinases and associated proteins in normal and pathological tear fluids: evidence that the PMN cell is a major source of MMP activity in tear fluid. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2003; 506:539-45. [PMID: 12613958 DOI: 10.1007/978-1-4615-0717-8_76] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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Nilsen-Hamilton M, Liu Q, Ryon J, Bendickson L, Lepont P, Chang Q. Tissue involution and the acute phase response. Ann N Y Acad Sci 2003; 995:94-108. [PMID: 12814942 DOI: 10.1111/j.1749-6632.2003.tb03213.x] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
After their roles in reproduction are completed, the mass of the uterus and the mammary gland decrease rapidly by the process of involution that involves an ordered series of events including apoptosis, neutrophil entry, the release of degradative enzymes, and phagocytosis of cellular debris. The acute phase proteins are produced by the liver and other tissues in response to inflammation or a toxic challenge. Uterocalin (SIP24/24p3) is one of these proteins. During involution, the mammary gland and uterus express high levels of uterocalin that reach an average of 0.2-0.5% of the total extractable protein at its peak. Uterocalin and its orthologues have been demonstrated in vitro to (1). bind certain fatty acids and (2). specifically induce apoptosis in neutrophils and other leukocytes. The period of uterocalin expression during involution is consistent with the hypothesis that one of its physiological roles is to induce apoptosis of invading neutrophils and delay the entry of neutrophils into the tissue until the second phase of involution. Interestingly, it has been shown that uterocalin expression remains higher in primiparous gland than in virgin glands after the pregnant glands have completely involuted. This observation and the known protective effect of early pregnancy on later development of breast cancer suggest that the ability of uterocalin to induce apoptosis in neutrophils might also decrease oxidative and carcinogenic activity in the gland and result in a lower mutation rate and thus a lower probability of cancer in the primiparous gland.
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Affiliation(s)
- Marit Nilsen-Hamilton
- Department of Biochemistry, Biophysics, and Molecular Biology, Iowa State University, Ames, Iowa 50011, USA.
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Mallbris L, O'Brien KP, Hulthén A, Sandstedt B, Cowland JB, Borregaard N, Ståhle-Bäckdahl M. Neutrophil gelatinase-associated lipocalin is a marker for dysregulated keratinocyte differentiation in human skin. Exp Dermatol 2002; 11:584-91. [PMID: 12473066 DOI: 10.1034/j.1600-0625.2002.110611.x] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Neutrophil gelatinase-associated lipocalin (NGAL) is a 25-kDa protein initially isolated from the specific granules of human neutrophils. It is a member of the highly heterogeneous lipocalin protein family, which shares a common tertiary structure. Its synthesis is induced in gastrointestinal epithelium in association with inflammation and malignancy. To gain insight into its potential role in other epithelia we have investigated the expression of NGAL in human skin embryonic development, in normal adult skin, and in skin associated with inflammation and neoplastic transformation. In the present study we report that the embryonic expression of NGAL appears to be regulated in a spatio-temporal pattern. It was induced in the interfollicular epidermis at 20-24 weeks of gestational age but thereafter progressively receded towards the hair follicles. In normal adult skin, NGAL was detected solely in association with hair follicles. However, strong induction of NGAL in the epidermis was seen in a variety of skin disorders characterized by dysregulated epithelial differentiation such as psoriasis, pityriasis rubra and squamous cell carcinoma. In these tissues production of NGAL was confined to spatially distinct subpopulations of keratinocytes underlying areas of parakeratosis, whereas skin samples lacking parakeratotic epithelium such as lichen ruber planus, acute contact eczema and basal cell carcinoma were negative for NGAL. Consistent with being a marker for disturbed terminal differentiation, NGAL immunoreactivity showed an inverse pattern when compared with that of the differentiation marker filaggrin. The biologic functions of NGAL in epithelia are not fully known, although an immunomodulatory role in host defense has been proposed. In addition, the transient interfollicular NGAL expression during skin embryogenesis along with the induction of NGAL in adult parakeratotic epidermis suggests it play a role in epithelial differentiation pathways.
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Affiliation(s)
- Lotus Mallbris
- Department of Dermatology, Karolinska Hospital, Stockholm, Sweden
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Goetz DH, Holmes MA, Borregaard N, Bluhm ME, Raymond KN, Strong RK. The neutrophil lipocalin NGAL is a bacteriostatic agent that interferes with siderophore-mediated iron acquisition. Mol Cell 2002; 10:1033-43. [PMID: 12453412 DOI: 10.1016/s1097-2765(02)00708-6] [Citation(s) in RCA: 994] [Impact Index Per Article: 45.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
First identified as a neutrophil granule component, neutrophil gelatinase-associated lipocalin (NGAL; also called human neutrophil lipocalin, 24p3, uterocalin, or neu-related lipocalin) is a member of the lipocalin family of binding proteins. Putative NGAL ligands, including neutrophil chemotactic agents such as N-formylated tripeptides, have all been refuted by recent biochemical and structural results. NGAL has subsequently been implicated in diverse cellular processes, but without a characterized ligand, the molecular basis of these functions remained mysterious. Here we report that NGAL tightly binds bacterial catecholate-type ferric siderophores through a cyclically permuted, hybrid electrostatic/cation-pi interaction and is a potent bacteriostatic agent in iron-limiting conditions. We therefore propose that NGAL participates in the antibacterial iron depletion strategy of the innate immune system.
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Affiliation(s)
- David H Goetz
- Molecular and Cellular Biology Program, Fred Hutchinson Cancer Research Center, Box 357275, University of Washington, Seattle, WA 98105, USA
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Gupta RA, Brockman JA, Sarraf P, Willson TM, DuBois RN. Target genes of peroxisome proliferator-activated receptor gamma in colorectal cancer cells. J Biol Chem 2001; 276:29681-7. [PMID: 11397807 DOI: 10.1074/jbc.m103779200] [Citation(s) in RCA: 154] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Activation of the nuclear hormone peroxisome proliferator-activated receptor gamma (PPARgamma) inhibits cell growth and promotes differentiation in a broad spectrum of epithelial derived tumor cell lines. Here we utilized microarray technology to identify PPARgamma gene targets in intestinal epithelial cells. For each gene, the induction or repression was seen with two structurally distinct PPARgamma agonists, and the change in expression could be blocked by co-treatment with a specific PPARgamma antagonist. A majority of the genes could be regulated independently by a retinoid X receptor specific agonist. Genes implicated in lipid transport or storage (adipophilin and liver fatty acid-binding protein) were also activated by agonists of PPAR subtypes alpha and/or delta. In contrast, PPARgamma-selective targets included genes linked to growth regulatory pathways (regenerating gene IA), colon epithelial cell maturation (GOB-4 and keratin 20), and immune modulation (neutrophil-gelatinase-associated lipocalin). Additionally, three different genes of the carcinoembryonic antigen family were induced by PPARgamma. Cultured cells treated with PPARgamma ligands demonstrated an increase in Ca(2+)-independent, carcinoembryonic antigen-dependent homotypic aggregation, suggesting a potential role for PPARgamma in regulating intercellular adhesion. Collectively, these results will help define the mechanisms by which PPARgamma regulates intestinal epithelial cell biology.
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Affiliation(s)
- R A Gupta
- Departments of Medicine and Cell Biology, Vanderbilt University Medical Center and Veterans Affairs Medical Center, Nashville, Tennessee 37232, USA
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Kjeldsen L, Cowland JB, Borregaard N. Human neutrophil gelatinase-associated lipocalin and homologous proteins in rat and mouse. BIOCHIMICA ET BIOPHYSICA ACTA 2000; 1482:272-83. [PMID: 11058768 DOI: 10.1016/s0167-4838(00)00152-7] [Citation(s) in RCA: 269] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Neutrophil gelatinase-associated lipocalin (NGAL) is a 25-kDa lipocalin originally purified from human neutrophils. It exists in monomeric and homo- and heterodimeric forms, the latter as a dimer with human neutrophil gelatinase. It is secreted from specific granules of activated human neutrophils. Homologous proteins have been identified in mouse (24p3/uterocalin) and rat (alpha(2)-microglobulin-related protein/neu-related lipocalin). Structural data have confirmed a typical lipocalin fold of NGAL with an eight-stranded beta-barrel, but with an unusually large cavity lined with more polar and positively charged amino acid residues than normally seen in lipocalins. Chemotactic formyl-peptides from bacteria have been proposed as ligands of NGAL, but binding experiments and the structure of NGAL do not support this hypothesis. Besides neutrophils, NGAL is expressed in most tissues normally exposed to microorganisms, and its synthesis is induced in epithelial cells during inflammation. This may indicate either a microbicidal activity of NGAL or a role in regulation of inflammation or cellular growth, putative functions yet to be demonstrated.
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Affiliation(s)
- L Kjeldsen
- The Granulocyte Research Laboratory, Department of Hematology, The National University Hospital, L-4042, Rigshospitalet, 9 Blegdamsvej, DK-2100 Copenhagen, Denmark.
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