1
|
The Combinatory Effect of Spirulina Supplementation and Resistance Exercise on Plasma Contents of Adipolin, Apelin, Ghrelin, and Glucose in Overweight and Obese Men. Mediators Inflamm 2022; 2022:9539286. [PMID: 35733519 PMCID: PMC9208992 DOI: 10.1155/2022/9539286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 02/16/2022] [Accepted: 03/26/2022] [Indexed: 11/18/2022] Open
Abstract
Methods The current investigation was conducted in a single-blind and quasiexperimental fashion. Sixty overweight and obese men (BMI > 25) ranging in age from 30 to 55 years were purposefully selected and randomly assigned to one of four groups: training plus spirulina (T+S), training plus placebo (T+P), spirulina (S), or placebo (P). For eight weeks, the (S) and (P) groups consumed two 500 mg spirulina and placebo capsules daily, respectively. Resistance training was performed three sessions a week over eight weeks, consisting of 12 movements with 1-, 2-, 3-, and 4-minute rest intervals and 40-90 percent maximal repetition. Adipolin, apelin, and ghrelin indices were measured before and after exercise using special kits. Results All variables changed significantly between groups except for apelin. Within-group comparisons revealed a substantial increase in adipolin levels in the (T+S) and (T+P) groups (P < 0.05). Apelin levels were decreased in the (T+S) and (T+P) groups. Additionally, FBS levels reduced significantly in (T+S) (P = 0.01). Conclusion It seems that eight weeks of circuit resistance training and spirulina supplementation can lead to reduced weight and apelin and FBS levels as well as increased concentrations of adipolin and ghrelin contents in overweight and obese men.
Collapse
|
2
|
Engelhard CA, Huang C, Khani S, Kasparek P, Prochazka J, Rozman J, Reguera DP, Sedlacek R, Kornfeld JW. Comprehensive Transcriptional Profiling and Mouse Phenotyping Reveals Dispensable Role for Adipose Tissue Selective Long Noncoding RNA Gm15551. Noncoding RNA 2022; 8:ncrna8030032. [PMID: 35645339 PMCID: PMC9149892 DOI: 10.3390/ncrna8030032] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Revised: 04/29/2022] [Accepted: 05/04/2022] [Indexed: 12/20/2022] Open
Abstract
Cold and nutrient-activated brown adipose tissue (BAT) is capable of increasing systemic energy expenditure via the uncoupled respiration and secretion of endocrine factors, thereby protecting mice against diet-induced obesity and improving insulin response and glucose tolerance in men. Long non-coding RNAs (lncRNAs) have recently been identified as fine-tuning regulators of cellular function. While certain lncRNAs have been functionally characterised in adipose tissue, their overall contribution in the activation of BAT remains elusive. We identified lncRNAs correlating to interscapular brown adipose tissue (iBAT) function in a high fat diet (HFD) and cold stressed mice. We focused on Gm15551, which has an adipose tissue specific expression profile, is highly upregulated during adipogenesis, and downregulated by β-adrenergic activation in mature adipocytes. Although we performed comprehensive transcriptional and adipocyte physiology profiling in vitro and in vivo, we could not detect an effect of gain or loss of function of Gm15551.
Collapse
Affiliation(s)
- Christoph Andreas Engelhard
- Department for Biochemistry and Molecular Biology (BMB), University of Southern Denmark, Campusvej 55, 5230 Odense, Denmark; (C.A.E.); (C.H.)
| | - Chien Huang
- Department for Biochemistry and Molecular Biology (BMB), University of Southern Denmark, Campusvej 55, 5230 Odense, Denmark; (C.A.E.); (C.H.)
- Laboratory of Animal Physiology, Department of Animal Science and Technology, National Taiwan University, Taipei 10617, Taiwan
| | - Sajjad Khani
- Max Planck Institute for Metabolism Research, Gleueler Strasse 50, 50931 Köln, Germany;
- Institute for Diabetes and Cancer (IDC), Helmholtz Zentrum München, German Research Center for Environmental Health, 85764 Neuherberg, Germany
- Cluster of Excellence Cellular Stress Responses in Aging-Associated Diseases (CECAD), Faculty of Medicine, University Hospital of Cologne, University of Cologne, Joseph-Stelzmann-Str. 26, 50931 Cologne, Germany
| | - Petr Kasparek
- Czech Centre for Phenogenomics, Institute of Molecular Genetics of the Czech Academy of Sciences, Prumyslova 595, 25250 Vestec, Czech Republic; (P.K.); (J.P.); (J.R.); (D.P.R.); (R.S.)
| | - Jan Prochazka
- Czech Centre for Phenogenomics, Institute of Molecular Genetics of the Czech Academy of Sciences, Prumyslova 595, 25250 Vestec, Czech Republic; (P.K.); (J.P.); (J.R.); (D.P.R.); (R.S.)
| | - Jan Rozman
- Czech Centre for Phenogenomics, Institute of Molecular Genetics of the Czech Academy of Sciences, Prumyslova 595, 25250 Vestec, Czech Republic; (P.K.); (J.P.); (J.R.); (D.P.R.); (R.S.)
| | - David Pajuelo Reguera
- Czech Centre for Phenogenomics, Institute of Molecular Genetics of the Czech Academy of Sciences, Prumyslova 595, 25250 Vestec, Czech Republic; (P.K.); (J.P.); (J.R.); (D.P.R.); (R.S.)
| | - Radislav Sedlacek
- Czech Centre for Phenogenomics, Institute of Molecular Genetics of the Czech Academy of Sciences, Prumyslova 595, 25250 Vestec, Czech Republic; (P.K.); (J.P.); (J.R.); (D.P.R.); (R.S.)
| | - Jan-Wilhelm Kornfeld
- Department for Biochemistry and Molecular Biology (BMB), University of Southern Denmark, Campusvej 55, 5230 Odense, Denmark; (C.A.E.); (C.H.)
- Max Planck Institute for Metabolism Research, Gleueler Strasse 50, 50931 Köln, Germany;
- Correspondence:
| |
Collapse
|
3
|
Thromboinflammatory Processes at the Nexus of Metabolic Dysfunction and Prostate Cancer: The Emerging Role of Periprostatic Adipose Tissue. Cancers (Basel) 2022; 14:cancers14071679. [PMID: 35406450 PMCID: PMC8996963 DOI: 10.3390/cancers14071679] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2022] [Revised: 03/03/2022] [Accepted: 03/04/2022] [Indexed: 02/07/2023] Open
Abstract
Simple Summary As overweight and obesity increase among the population worldwide, a parallel increase in the number of individuals diagnosed with prostate cancer was observed. There appears to be a relationship between both diseases where the increase in the mass of fat tissue can lead to inflammation. Such a state of inflammation could produce many factors that increase the aggressiveness of prostate cancer, especially if this inflammation occurred in the fat stores adjacent to the prostate. Another important observation that links obesity, fat tissue inflammation, and prostate cancer is the increased production of blood clotting factors. In this article, we attempt to explain the role of these latter factors in the effect of increased body weight on the progression of prostate cancer and propose new ways of treatment that act by affecting how these clotting factors work. Abstract The increased global prevalence of metabolic disorders including obesity, insulin resistance, metabolic syndrome and diabetes is mirrored by an increased incidence of prostate cancer (PCa). Ample evidence suggests that these metabolic disorders, being characterized by adipose tissue (AT) expansion and inflammation, not only present as risk factors for the development of PCa, but also drive its increased aggressiveness, enhanced progression, and metastasis. Despite the emerging molecular mechanisms linking AT dysfunction to the various hallmarks of PCa, thromboinflammatory processes implicated in the crosstalk between these diseases have not been thoroughly investigated. This is of particular importance as both diseases present states of hypercoagulability. Accumulating evidence implicates tissue factor, thrombin, and active factor X as well as other players of the coagulation cascade in the pathophysiological processes driving cancer development and progression. In this regard, it becomes pivotal to elucidate the thromboinflammatory processes occurring in the periprostatic adipose tissue (PPAT), a fundamental microenvironmental niche of the prostate. Here, we highlight key findings linking thromboinflammation and the pleiotropic effects of coagulation factors and their inhibitors in metabolic diseases, PCa, and their crosstalk. We also propose several novel therapeutic targets and therapeutic interventions possibly modulating the interaction between these pathological states.
Collapse
|
4
|
Lipocalin 2 serum levels correlate with age and bone turnover biomarkers in healthy subjects but not in postmenopausal osteoporotic women. Bone Rep 2021; 14:101059. [PMID: 34026950 PMCID: PMC8121999 DOI: 10.1016/j.bonr.2021.101059] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Revised: 03/16/2021] [Accepted: 03/24/2021] [Indexed: 12/25/2022] Open
Abstract
Purpose Lipocalin 2 (LCN2) is an adipokine involved in many physiological functions, including bone metabolism. We previously demonstrated its implication in mouse models of mechanical unloading-induced osteoporosis and in a cohort of bed rest volunteers. We therefore aimed at studying its involvement in postmenopausal osteoporosis. Methods We measured serum LCN2 and correlated its levels to Dickkopf WNT Signaling Pathway Inhibitor 1 (DKK1), Tartrate Resistant Acid Phosphatase 5B (TRAcP5B), sclerostin, urinary N-terminal telopeptide of type I collagen (NTX), serum C-terminal telopeptide of type I collagen (CTX), parathyroid hormone and vitamin K by ELISA performed in a cohort of younger (50–65 years) and older (66–90 years) osteoporotic women in comparison to healthy subjects. A cohort of male healthy and osteoarthritic patients was also included. Sobel mediation analysis was used to test indirect associations among age, LCN2 and DKK1 or NTX. Results LCN2 levels were unchanged in osteoporotic and in osteoarthritis patients when compared to healthy subjects and did not correlate with BMD. However, serum LCN2 correlated with age in healthy women (R = 0.44; P = 0.003) and men (R = 0.5; P = 0.001) and serum concentrations of DKK1 (R = 0.47; P = 0.003) and urinary NTX (R = 0.34; P = 0.04). Sobel mediation analysis showed that LCN2 mediates an indirect relationship between age and DKK1 (P = 0.02), but not with NTX, in healthy subjects. Conclusions Taken together, the results suggest a hitherto unknown association between LCN2, DKK1 and age in healthy individuals, but not in postmenopausal osteoporotic women.
Collapse
Key Words
- BALP, bone-specific alkaline phosphatase
- BMD, bone mineral density
- BMI, body mass index
- CTX, C-terminal telopeptide of type I collagen
- DKK1
- DKK1, Dickkopf WNT Signaling Pathway Inhibitor 1
- IL, interleukin
- LCN2, lipocalin 2
- Lipocalin-2
- NGAL
- NTX, N-terminal telopeptide of type I collagen
- NfκB, nuclear factor kappa-B
- Osteoarthritis
- Osteoporosis
- PTH, parathyroid hormone
- RANKL, receptor activator of nuclear factor kappa-B
- TNF, tumor necrosis factor
- TRAcP5B, tartrate-resistant acid phosphatase 5B
- Wnt
Collapse
|
5
|
Recinella L, Orlando G, Ferrante C, Chiavaroli A, Brunetti L, Leone S. Adipokines: New Potential Therapeutic Target for Obesity and Metabolic, Rheumatic, and Cardiovascular Diseases. Front Physiol 2020; 11:578966. [PMID: 33192583 PMCID: PMC7662468 DOI: 10.3389/fphys.2020.578966] [Citation(s) in RCA: 106] [Impact Index Per Article: 26.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Accepted: 10/14/2020] [Indexed: 12/11/2022] Open
Abstract
Besides its role as an energy storage organ, adipose tissue can be viewed as a dynamic and complex endocrine organ, which produces and secretes several adipokines, including hormones, cytokines, extracellular matrix (ECM) proteins, and growth and vasoactive factors. A wide body of evidence showed that adipokines play a critical role in various biological and physiological functions, among which feeding modulation, inflammatory and immune function, glucose and lipid metabolism, and blood pressure control. The aim of this review is to summarize the effects of several adipokines, including leptin, diponectin, resistin, chemerin, lipocalin-2 (LCN2), vaspin, omentin, follistatin-like 1 (FSTL1), secreted protein acidic and rich in cysteine (SPARC), secreted frizzled-related protein 5 (SFRP5), C1q/TNF-related proteins (CTRPs), family with sequence similarity to 19 member A5 (FAM19A5), wingless-type inducible signaling pathway protein-1 (WISP1), progranulin (PGRN), nesfatin-1 (nesfatin), visfatin/PBEF/NAMPT, apelin, retinol binding protein 4 (RPB4), and plasminogen activator inhibitor-1 (PAI-1) in the regulation of insulin resistance and vascular function, as well as many aspects of inflammation and immunity and their potential role in managing obesity-associated diseases, including metabolic, osteoarticular, and cardiovascular diseases.
Collapse
Affiliation(s)
| | | | | | | | - Luigi Brunetti
- Department of Pharmacy, Gabriele d’Annunzio University, Chieti, Italy
| | | |
Collapse
|
6
|
Meurer SK, Tezcan O, Lammers T, Weiskirchen R. Differential regulation of Lipocalin 2 (LCN2) in doxorubicin-resistant 4T1 triple negative breast cancer cells. Cell Signal 2020; 74:109731. [DOI: 10.1016/j.cellsig.2020.109731] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2020] [Revised: 07/25/2020] [Accepted: 07/27/2020] [Indexed: 12/22/2022]
|
7
|
Chong JJH, Prince RL, Thompson PL, Thavapalachandran S, Ooi E, Devine A, Lim EEM, Byrnes E, Wong G, Lim WH, Lewis JR. Association Between Plasma Neutrophil Gelatinase-Associated Lipocalin and Cardiac Disease Hospitalizations and Deaths in Older Women. J Am Heart Assoc 2020; 8:e011028. [PMID: 30595080 PMCID: PMC6405726 DOI: 10.1161/jaha.118.011028] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Background Neutrophil gelatinase‐associated lipocalin (NGAL) or lipocalin 2 may promote atherosclerosis and plaque instability leading to increased risk of cardiac events. We investigated the relationships between plasma NGAL, cardiovascular disease biomarkers, and long‐term cardiac events. Methods and Results The study population consisted of 1131 ambulant older white women (mean age 75 years) without clinical coronary heart disease (CHD) and measures of plasma NGAL in the Perth Longitudinal Study of Ageing Women with 14.5‐year CHD and heart failure hospitalizations or death (events) captured using linked records. Over 14.5 years, 256 women had CHD events, while 118 had heart failure events. Per SD increase in log‐transformed NGAL there was a 35% to 37% increase in relative hazards for CHD and heart failure events in unadjusted analyses, which remained significant after adjustment for conventional risk factors for CHD events (hazard ratio 1.29, 95% CI 1.13–1.48, P<0.001) but not heart failure (P>0.05). Women in the highest 2 quartiles of NGAL had higher relative hazards for CHD events compared with women in the lowest quartile hazard ratio 1.61, 95% CI 1.08–2.39, P=0.019 and hazard ratio 1.97, 95% CI 1.33–3.93, P=0.001, respectively. These associations were independent of high‐sensitivity cardiac troponin I, homocysteine, and estimated renal function. NGAL correctly reclassified 1 in 4 women who sustained a CHD event up in risk and 1 in 10 women without CHD events down in risk. Conclusions NGAL was associated with increased risk of long‐term CHD events, independent of conventional risk factors and biomarkers. These findings provide mechanistic insight into the role of NGAL with cardiac events.
Collapse
Affiliation(s)
- James J H Chong
- 1 Centre for Heart Research Westmead Institute for Medical Research The University of Sydney Westmead New South Wales Australia.,2 Department of Cardiology Westmead Hospital Westmead New South Wales Australia.,3 Sydney Medical School The University of Sydney Sydney New South Wales Australia
| | - Richard L Prince
- 4 Medical School University of Western Australia Perth Australia.,6 Department of Endocrinology and Diabetes Sir Charles Gairdner Hospital Perth Australia
| | - Peter L Thompson
- 7 Department of Cardiology Sir Charles Gairdner Hospital Perth Australia
| | - Sujitha Thavapalachandran
- 1 Centre for Heart Research Westmead Institute for Medical Research The University of Sydney Westmead New South Wales Australia
| | - Esther Ooi
- 4 Medical School University of Western Australia Perth Australia.,5 School of Biomedical Sciences University of Western Australia Perth Australia
| | - Amanda Devine
- 10 School of Medical and Health Sciences Edith Cowan University Joondalup Western Australia Australia
| | - E E M Lim
- 9 PathWest Sir Charles Gairdner Hospital Perth Australia
| | | | - Germaine Wong
- 11 Centre for Kidney Research Children's Hospital at Westmead School of Public Health Sydney Medical School The University of Sydney Sydney Australia
| | - Wai H Lim
- 8 Department of Renal Medicine Sir Charles Gairdner Hospital Perth Australia
| | - Joshua R Lewis
- 4 Medical School University of Western Australia Perth Australia.,10 School of Medical and Health Sciences Edith Cowan University Joondalup Western Australia Australia.,11 Centre for Kidney Research Children's Hospital at Westmead School of Public Health Sydney Medical School The University of Sydney Sydney Australia
| |
Collapse
|
8
|
Veeriah V, Paone R, Chatterjee S, Teti A, Capulli M. Osteoblasts Regulate Angiogenesis in Response to Mechanical Unloading. Calcif Tissue Int 2019; 104:344-354. [PMID: 30465120 DOI: 10.1007/s00223-018-0496-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Accepted: 11/16/2018] [Indexed: 12/29/2022]
Abstract
During mechanical unloading, endothelial cells reduce osteogenesis and increase bone resorption. Here we describe the feedback response of endothelial cells to unloaded osteoblasts. Primary endothelial cells, ex vivo mouse aortic rings and chicken egg yolk membranes were incubated with conditioned medium from mouse primary osteoblasts (OB-CM) subjected to unit gravity or simulated microgravity, to assess its effect on angiogenesis. In vivo injection of botulin toxin A (Botox) in the quadriceps and calf muscles of C57BL/6J mice was performed to mimic disuse osteoporosis. Unloaded osteoblasts showed strong upregulation of the pro-angiogenic factor, VEGF, and their conditioned medium increased in vitro endothelial cell viability, Cyclin D1 expression, migration and tube formation, ex vivo endothelial cell sprouting from aortic rings, and in ovo angiogenesis. Treatment with the VEGF blocker, avastin, prevented unloaded OB-CM-mediated in vitro and ex vivo enhancement of angiogenesis. Bone mechanical unloading by Botox treatment, known to reduce bone mass, prompted the overexpression of VEGF in osteoblasts. The cross talk between osteoblasts and endothelial cells plays a pathophysiologic role in the response of the endothelium to unloading during disuse osteoporosis. In this context, VEGF represents a prominent osteoblast factor stimulating angiogenesis.
Collapse
Affiliation(s)
- Vimal Veeriah
- Department of Biotechnological and Applied Clinical Sciences, University of L'Aquila, via Vetoio - Coppito 2, 67100, L'aquila, Italy
| | - Riccardo Paone
- Department of Biotechnological and Applied Clinical Sciences, University of L'Aquila, via Vetoio - Coppito 2, 67100, L'aquila, Italy
| | - Suvro Chatterjee
- Anna University K.B.Chandrashekar Research Centre, Chennai, India
- Department of Biotechnology, Anna University, Chennai, India
| | - Anna Teti
- Department of Biotechnological and Applied Clinical Sciences, University of L'Aquila, via Vetoio - Coppito 2, 67100, L'aquila, Italy.
| | - Mattia Capulli
- Department of Biotechnological and Applied Clinical Sciences, University of L'Aquila, via Vetoio - Coppito 2, 67100, L'aquila, Italy
| |
Collapse
|
9
|
Koban Y, Sahin S, Boy F, Kara F. Elevated lipocalin-2 level in aqueous humor of patients with central retinal vein occlusion. Int Ophthalmol 2018; 39:981-986. [PMID: 29572586 DOI: 10.1007/s10792-018-0894-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Accepted: 03/16/2018] [Indexed: 11/24/2022]
Abstract
PURPOSE To assess the concentrations of lipocalin-2 (LCN2) in the serum and the aqueous humor of patients with central retinal vein occlusion (CRVO). METHODS The concentrations of LCN2 in the serum and aqueous humor of 16 cataract patients and 16 patients with CRVO with macular edema were compared. Collection of aqueous samples was conducted in the operating theater under sterile conditions and just prior to intravitreal ranibizumab injection or cataract surgery. LCN2 levels in serum and aqueous humor samples were measured using a commercial kit (human lipocalin-2/NGAL PicoKine ELISA Kit, MyBioSource Inc., USA; Catalog No: MBS175829) based on standard sandwich enzyme-linked immunosorbent assay technology. RESULTS The concentrations of LCN2 in the aqueous humors of the CRVO group were higher than those of the control group (p = 0.021). There was no significant difference in serum LCN2 level between the two groups (p = 0.463). CONCLUSIONS Concentrations of LCN2 in aqueous humor are increased in CRVO. LCN2 may be part of a pro-catabolic phenotype, and it may play an important role in the dreaded complications of CRVO, such as macular edema, macular ischemia, and neovascularization, which lead to blindness.
Collapse
Affiliation(s)
- Yaran Koban
- Department of Ophthalmology, Faculty of Medicine, Kafkas University, Kars, Turkey.
| | - Seda Sahin
- Department of Biochemistry, Faculty of Medicine, Kafkas University, Kars, Turkey
| | - Fatih Boy
- Department of Biochemistry, Faculty of Medicine, Kafkas University, Kars, Turkey
| | - Fatih Kara
- Department of Biochemistry, Faculty of Medicine, Kafkas University, Kars, Turkey
| |
Collapse
|
10
|
Interleukin-1β, lipocalin 2 and nitric oxide synthase 2 are mechano-responsive mediators of mouse and human endothelial cell-osteoblast crosstalk. Sci Rep 2016; 6:29880. [PMID: 27430980 PMCID: PMC4949438 DOI: 10.1038/srep29880] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Accepted: 06/23/2016] [Indexed: 01/11/2023] Open
Abstract
Endothelial cells are spatially close to osteoblasts and regulate osteogenesis. Moreover, they are sensitive to mechanical stimuli, therefore we hypothesized that they are implicated in the regulation of bone metabolism during unloading. Conditioned media from endothelial cells (EC-CM) subjected to simulated microgravity (0.08g and 0.008g) increased osteoblast proliferation and decreased their differentiation compared to unit gravity (1g) EC-CM. Microgravity-EC-CM increased the expression of osteoblast Rankl and subsequent osteoclastogenesis, and induced the osteoblast de-differentiating factor, Lipocalin 2 (Lcn2), whose downregulation recovered osteoblast activity, decreased Rankl expression and reduced osteoclastogenesis. Microgravity-EC-CM enhanced osteoblast NO-Synthase2 (NOS2) and CycloOXygenase2 (COX2) expression. Inhibition of NOS2 or NO signaling reduced osteoblast proliferation and rescued their differentiation. Nuclear translocation of the Lcn2/NOS2 transcription factor, NF-κB, occurred in microgravity-EC-CM-treated osteoblasts and in microgravity-treated endothelial cells, alongside high expression of the NF-κB activator, IL-1β. IL-1β depletion and NF-κB inhibition reduced osteoblast proliferation and rescued differentiation. Lcn2 and NOS2 were incremented in ex vivo calvarias cultured in microgravity-EC-CM, and in vivo tibias and calvarias injected with microgravity-EC-CM. Furthermore, tibias of botulin A toxin-treated and tail-suspended mice, which featured unloading and decreased bone mass, showed higher expression of IL-1β, Lcn2 and Nos2, suggesting their pathophysiologic involvement in endothelial cell-osteoblast crosstalk.
Collapse
|
11
|
Mori K, Suzuki T, Minamishima S, Igarashi T, Inoue K, Nishimura D, Seki H, Yamada T, Kosugi S, Katori N, Hashiguchi S, Morisaki H. Neutrophil gelatinase-associated lipocalin regulates gut microbiota of mice. J Gastroenterol Hepatol 2016; 31:145-54. [PMID: 26189649 DOI: 10.1111/jgh.13042] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 06/25/2015] [Indexed: 12/14/2022]
Abstract
BACKGROUND AND AIM Because neutrophil gelatinase-associated lipocalin (NGAL) is known to provide significant bacteriostatic effects during infectious conditions, we tested the hypothesis that this protein is up-regulated and secreted into the intraluminal cavity of the gut under critically ill conditions and is thus responsible for the regulation of bacterial overgrowth. METHODS With our institutional approval, male C57BL/6J mouse (6-7 weeks) were enrolled and applied for lipopolysaccharide or peritonitis model compared with naïve control. We assessed NGAL protein concentrations in intestinal lumen and up-regulation of NGAL expression in intestinal tissues in in vivo as well as ex vivo settings. Simultaneously, we examined the effects of NGAL protein administration on the growth of Escherichia coli (E. coli) in in vivo and in vitro experimental settings. The localization of NGAL in intestinal tissues and lumen was also assessed by immunohistological approach using NGAL antibody. RESULTS Both lipopolysaccharide and peritonitis insults evoked the marked up-regulation of NGAL mRNA and protein levels in gut tissues such as crypt cells. In addition, the administration of NGAL protein significantly inhibited the outgrowth of enteric E. coli under both in vitro and in vivo conditions, accompanied by histological evidence. CONCLUSION Neutrophil gelatinase-associated lipocalin protein accompanied by apparent bacteriostatic action accumulated in the intestinal wall and streamed into the mucosal layer during critically ill state, thereby possibly shaping microbiota homeostasis in the gut.
Collapse
Affiliation(s)
- Katsuya Mori
- Department of Anesthesiology, Keio University School of Medicine, Tokyo, Japan.,Japan Society of the Promotion of Science, Tokyo, Japan
| | - Takeshi Suzuki
- Department of Anesthesiology, Keio University School of Medicine, Tokyo, Japan
| | - Shizuka Minamishima
- Department of Anesthesiology, Keio University School of Medicine, Tokyo, Japan
| | - Toru Igarashi
- Department of Anesthesiology, Keio University School of Medicine, Tokyo, Japan
| | - Kei Inoue
- Department of Anesthesiology, Keio University School of Medicine, Tokyo, Japan
| | - Daisuke Nishimura
- Department of Anesthesiology, Keio University School of Medicine, Tokyo, Japan
| | - Hiroyuki Seki
- Department of Anesthesiology, Keio University School of Medicine, Tokyo, Japan
| | - Takashige Yamada
- Department of Anesthesiology, Keio University School of Medicine, Tokyo, Japan
| | - Shizuko Kosugi
- Department of Anesthesiology, Keio University School of Medicine, Tokyo, Japan
| | - Nobuyuki Katori
- Department of Anesthesiology, Keio University School of Medicine, Tokyo, Japan
| | - Saori Hashiguchi
- Department of Anesthesiology, Keio University School of Medicine, Tokyo, Japan
| | - Hiroshi Morisaki
- Department of Anesthesiology, Keio University School of Medicine, Tokyo, Japan
| |
Collapse
|
12
|
Abella V, Scotece M, Conde J, Gómez R, Lois A, Pino J, Gómez-Reino JJ, Lago F, Mobasheri A, Gualillo O. The potential of lipocalin-2/NGAL as biomarker for inflammatory and metabolic diseases. Biomarkers 2015; 20:565-71. [PMID: 26671823 PMCID: PMC4819811 DOI: 10.3109/1354750x.2015.1123354] [Citation(s) in RCA: 169] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Lipocalin-2 (LCN2), also known as neutrophil gelatinase-associated lipocalin (NGAL), is a secreted glycoprotein that belongs to a group of transporters of small lipophilic molecules in circulation. LCN2 has been recently characterized as an adipose-derived cytokine. This adipokine is believed to bind small substances, such as steroids and lipopolysaccharides, and has been reported to have roles in the induction of apoptosis in hematopoietic cells, transport of fatty acids and iron, modulation of inflammation, and metabolic homeostasis. Recently, LCN2 has emerged as a useful biomarker and rheumatic diseases. This review provides an overview of LCN2 in inflammation, immunity, and metabolism.
Collapse
Affiliation(s)
- Vanessa Abella
- a SERGAS (Servizo Galego de Saude), Research Laboratory 9, NEIRID Lab (Neuroendocrine Interactions in Rheumatology and Inflammatory Diseases), Institute of Medical Research (IDIS), Santiago University Clinical Hospital , Santiago de Compostela , Spain .,b Departamento de Bioloxía Celular e Molecular , Facultade de Ciencias, Universidade Da Coruña (UDC) , Campus de A Coruña , Spain
| | - Morena Scotece
- a SERGAS (Servizo Galego de Saude), Research Laboratory 9, NEIRID Lab (Neuroendocrine Interactions in Rheumatology and Inflammatory Diseases), Institute of Medical Research (IDIS), Santiago University Clinical Hospital , Santiago de Compostela , Spain
| | - Javier Conde
- a SERGAS (Servizo Galego de Saude), Research Laboratory 9, NEIRID Lab (Neuroendocrine Interactions in Rheumatology and Inflammatory Diseases), Institute of Medical Research (IDIS), Santiago University Clinical Hospital , Santiago de Compostela , Spain
| | - Rodolfo Gómez
- a SERGAS (Servizo Galego de Saude), Research Laboratory 9, NEIRID Lab (Neuroendocrine Interactions in Rheumatology and Inflammatory Diseases), Institute of Medical Research (IDIS), Santiago University Clinical Hospital , Santiago de Compostela , Spain
| | - Ana Lois
- a SERGAS (Servizo Galego de Saude), Research Laboratory 9, NEIRID Lab (Neuroendocrine Interactions in Rheumatology and Inflammatory Diseases), Institute of Medical Research (IDIS), Santiago University Clinical Hospital , Santiago de Compostela , Spain
| | - Jesús Pino
- c SERGAS, Division of Orthopaedics Surgery and Traumatology, Santiago University Clinical Hospital , Santiago de Compostela , Spain
| | - Juan J Gómez-Reino
- a SERGAS (Servizo Galego de Saude), Research Laboratory 9, NEIRID Lab (Neuroendocrine Interactions in Rheumatology and Inflammatory Diseases), Institute of Medical Research (IDIS), Santiago University Clinical Hospital , Santiago de Compostela , Spain
| | - Francisca Lago
- d SERGAS (Servizo Galego de Saude), Research Laboratory 7, Molecular and Cellular Cardiology Laboratory, Institute of Medical Research (IDIS), Santiago University Clinical Hospital , Santiago de Compostela , Spain
| | - Ali Mobasheri
- e The D-BOARD European Consortium for Biomarker Discovery, Department of Veterinary Preclinical Sciences, School of Veterinary Medicine, Faculty of Health and Medical Sciences, University of Surrey , Guildford , UK .,f Arthritis Research UK Centre for Sport, Exercise and Osteoarthritis, Arthritis Research UK Pain Centre, Medical Research Council and Arthritis Research UK Centre for Musculoskeletal Ageing Research, University of Nottingham, Queen's Medical Centre , Nottingham , UK , and.,g Center of Excellence in Genomic Medicine Research (CEGMR), King Fahd Medical Research Center (KFMRC), Faculty of Applied Medical Sciences, King AbdulAziz University , Jeddah , Kingdom of Saudi Arabia
| | - Oreste Gualillo
- a SERGAS (Servizo Galego de Saude), Research Laboratory 9, NEIRID Lab (Neuroendocrine Interactions in Rheumatology and Inflammatory Diseases), Institute of Medical Research (IDIS), Santiago University Clinical Hospital , Santiago de Compostela , Spain
| |
Collapse
|
13
|
Zhang Y, Foncea R, Deis JA, Guo H, Bernlohr DA, Chen X. Lipocalin 2 expression and secretion is highly regulated by metabolic stress, cytokines, and nutrients in adipocytes. PLoS One 2014; 9:e96997. [PMID: 24818605 PMCID: PMC4018437 DOI: 10.1371/journal.pone.0096997] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2013] [Accepted: 04/14/2014] [Indexed: 01/03/2023] Open
Abstract
Lipocalin 2 (Lcn2) has been recently characterized as a new adipokine having a role in innate immunity and energy metabolism. Nonetheless, the metabolic regulation of Lcn2 production in adipocytes has not been comprehensively studied. To better understand the Lcn2 biology, we investigated the regulation of Lcn2 expression in adipose tissue in response to metabolic stress in mice as well as the control of Lcn2 expression and secretion by cytokines and nutrients in 3T3-L1 adipocytes. Our results showed that the mRNA expression of Lcn2 was upregulated in white and brown adipose tissues as well as liver during fasting and cold stress in mice. Among pro-inflammatory cytokines TNFα, IL-1β, and IL-6, IL-1β showed most profound effect on Lcn2 expression and secretion in 3T3-L1 adipocytes. Insulin stimulated Lcn2 expression and secretion in a dose-dependent manner; this insulin effect was significantly abolished in the presence of low concentration of glucose. Moreover, insulin-stimulated Lcn2 expression and secretion was also attenuated when glucose was replaced by 3-O-methyl-d-glucose or by blocking NFκB pathway activation. Additionally, we showed that palmitate and oleate induced Lcn2 expression and secretion more significantly than EPA, while phytanic acid reduced Lcn2 production. Our results demonstrated that Lcn2 production in adipocytes is highly responsive to metabolic stress, cytokines, and nutrient signals, suggesting an important role of Lcn2 in adipocyte metabolism and inflammation.
Collapse
Affiliation(s)
- Yuanyuan Zhang
- Department of Food Science and Nutrition, University of Minnesota-Twin Cities, Saint Paul, Minnesota, United States of America
| | - Rocio Foncea
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota-Twin Cities, Minneapolis, Minnesota, United States of America
| | - Jessica A. Deis
- Department of Food Science and Nutrition, University of Minnesota-Twin Cities, Saint Paul, Minnesota, United States of America
| | - Hong Guo
- Department of Food Science and Nutrition, University of Minnesota-Twin Cities, Saint Paul, Minnesota, United States of America
| | - David A. Bernlohr
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota-Twin Cities, Minneapolis, Minnesota, United States of America
| | - Xiaoli Chen
- Department of Food Science and Nutrition, University of Minnesota-Twin Cities, Saint Paul, Minnesota, United States of America
- * E-mail:
| |
Collapse
|
14
|
Abella V, Scotece M, Conde J, López V, Lazzaro V, Pino J, Gómez-Reino JJ, Gualillo O. Adipokines, metabolic syndrome and rheumatic diseases. J Immunol Res 2014; 2014:343746. [PMID: 24741591 PMCID: PMC3987880 DOI: 10.1155/2014/343746] [Citation(s) in RCA: 103] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Revised: 01/10/2014] [Accepted: 01/10/2014] [Indexed: 02/06/2023] Open
Abstract
The metabolic syndrome (MetS) is a cluster of cardiometabolic disorders that result from the increasing prevalence of obesity. The major components of MetS include insulin resistance, central obesity, dyslipidemia, and hypertension. MetS identifies the central obesity with increased risk for cardiovascular diseases (CVDs) and type-2 diabetes mellitus (T2DM). Patients with rheumatic diseases, such as rheumatoid arthritis, osteoarthritis, systemic lupus erythematosus, and ankylosing spondylitis, have increased prevalence of CVDs. Moreover, CVD risk is increased when obesity is present in these patients. However, traditional cardiovascular risk factors do not completely explain the enhanced cardiovascular risk in this population. Thus, MetS and the altered secretion patterns of proinflammatory adipokines present in obesity could be the link between CVDs and rheumatic diseases. Furthermore, adipokines have been linked to the pathogenesis of MetS and its comorbidities through their effects on vascular function and inflammation. In the present paper, we review recent evidence of the role played by adipokines in the modulation of MetS in the general population, and in patients with rheumatic diseases.
Collapse
Affiliation(s)
- Vanessa Abella
- SERGAS, Research Laboratory 9, NEIRID Lab (Neuroendocrine Interactions in Rheumatology and Inflammatory Diseases), Institute of Medical Research (IDIS), Santiago University Clinical Hospital, 15706 Santiago de Compostela, Spain ; Department of Molecular and Cellular Biology, University of Coruña (UDC), 15071 A Coruña, Spain
| | - Morena Scotece
- SERGAS, Research Laboratory 9, NEIRID Lab (Neuroendocrine Interactions in Rheumatology and Inflammatory Diseases), Institute of Medical Research (IDIS), Santiago University Clinical Hospital, 15706 Santiago de Compostela, Spain
| | - Javier Conde
- SERGAS, Research Laboratory 9, NEIRID Lab (Neuroendocrine Interactions in Rheumatology and Inflammatory Diseases), Institute of Medical Research (IDIS), Santiago University Clinical Hospital, 15706 Santiago de Compostela, Spain
| | - Verónica López
- SERGAS, Research Laboratory 9, NEIRID Lab (Neuroendocrine Interactions in Rheumatology and Inflammatory Diseases), Institute of Medical Research (IDIS), Santiago University Clinical Hospital, 15706 Santiago de Compostela, Spain
| | - Verónica Lazzaro
- SERGAS, Research Laboratory 9, NEIRID Lab (Neuroendocrine Interactions in Rheumatology and Inflammatory Diseases), Institute of Medical Research (IDIS), Santiago University Clinical Hospital, 15706 Santiago de Compostela, Spain ; University Magna Graecia of Catanzaro, 88100 Catanzaro, Italy
| | - Jesús Pino
- SERGAS, Division of Orthopaedics Surgery and Traumatology, Santiago University Clinical Hospital, 15706 Santiago de Compostela, Spain
| | - Juan J Gómez-Reino
- SERGAS, Research Laboratory 9, NEIRID Lab (Neuroendocrine Interactions in Rheumatology and Inflammatory Diseases), Institute of Medical Research (IDIS), Santiago University Clinical Hospital, 15706 Santiago de Compostela, Spain
| | - Oreste Gualillo
- SERGAS, Research Laboratory 9, NEIRID Lab (Neuroendocrine Interactions in Rheumatology and Inflammatory Diseases), Institute of Medical Research (IDIS), Santiago University Clinical Hospital, 15706 Santiago de Compostela, Spain
| |
Collapse
|
15
|
Neutrophil gelatinase-associated lipocalin levels associated with cardiovascular disease in chronic kidney disease patients. Clin Exp Nephrol 2013; 18:778-83. [PMID: 24337622 DOI: 10.1007/s10157-013-0923-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2013] [Accepted: 11/28/2013] [Indexed: 01/04/2023]
Abstract
BACKGROUND Elevated levels of neutrophil gelatinase-associated lipocalin (NGAL) have been reported in patients with cardiovascular disease (CVD), heart failure, and stroke. We assessed the relationships between serum levels of NGAL and the prevalence of CVD, and clarified the prognostic usefulness of systemic NGAL levels in hemodialysis (HD) patients. METHODS Eighty-eight HD patients were followed up for 1 year. Logistic regression analyses were used to investigate the relationship between de novo CVD status and NGAL levels as well as other risk factors. RESULTS During follow-up, CVD events occurred in 20 patients. Initial serum levels of NGAL and brain natriuretic peptide of HD patients with de novo CVD were significantly higher than those of HD patients without de novo CVD. Multivariate logistic regression analyses showed that initial serum levels of NGAL were independent risk factors for de novo CVD in HD patients. When patients were classified on the basis of NGAL quartiles, multiple logistic regression analyses demonstrated that the highest quartile of NGAL level showed an increased odds ratio for the prevalence of CVD. CONCLUSION These findings suggest that NGAL levels can be used to detect the prevalence of CVD in HD patients with or without diabetes.
Collapse
|
16
|
Gómez R, Scotece M, Conde J, Lopez V, Pino J, Lago F, Gómez-Reino JJ, Gualillo O. Nitric oxide boosts TLR-4 mediated lipocalin 2 expression in chondrocytes. J Orthop Res 2013; 31:1046-52. [PMID: 23483583 DOI: 10.1002/jor.22331] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/29/2012] [Accepted: 02/05/2013] [Indexed: 02/04/2023]
Abstract
Lipocalin 2 (LCN2) has recently emerged as a novel adipokine involved in different processes including arthritis and chondrocyte inflammatory response. However, little is known about its activity on chondrocyte homeostasis and its regulation by nitric oxide (NO) Hence, we performed a set of experiments aimed to achieve a better understanding of this relationship. Cell vitality was tested in the ATDC5 cell line by the MTT colorimetric assay. Protein expression and gene expression was evaluated by Western blot and real time RT-PCR, respectively. NO production (determined as nitrite accumulation) was assayed by the Griess reaction. First, we demonstrated that LCN2 decreased murine chondrocytes vitality. Next, LCN2 co-stimulation with LPS enhanced NOS2 protein expression by murine chondrocytes. In addition, inhibition of LPS-induced nitric oxide production by aminoguanidine, a selective NOS2 inhibitor, significantly reduced LPS-mediated LCN2 expression. In contrast, treatment of murine chondrocytes with sodium nitroprussiate (SNP), a classic NO donor, scarcely induced LCN2 expression. Intriguingly, SNP addition to LPS-challenged chondrocytes, treated with aminoguanidine, provoked a strong induction of LCN2 expression. Finally, murine ATDC5 cells, co-cultured with LPS pre-challenged macrophages, had higher LCN2 expression in comparison with murine chondrocytes co-cultured with non pre-challenged macrophages. In this work we have described for the first time that NO is able to exert a control on LCN2 expression, suggesting the existence of a feedback loop regulating its expression.
Collapse
Affiliation(s)
- Rodolfo Gómez
- SERGAS, Santiago University Clinical Hospital Research Laboratory 9 (NEIRID LAB: Neuroendocrine Interactions in Rheumatology and Inflammatory Diseases), Institute of Medical Research (IDIS), Santiago de Compostela, 15706, Spain
| | | | | | | | | | | | | | | |
Collapse
|
17
|
STAT1, NF-κB and ERKs play a role in the induction of lipocalin-2 expression in adipocytes. Mol Metab 2013; 2:161-70. [PMID: 24049731 DOI: 10.1016/j.molmet.2013.04.003] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/07/2013] [Revised: 04/18/2013] [Accepted: 04/19/2013] [Indexed: 11/22/2022] Open
Abstract
Lipocalin-2 (LCN2) is induced in conditions of obesity and Type 2 diabetes (T2DM). IFNγ and TNFα induce LCN2 expression in adipocytes in a manner that is dependent on transcription. The effects of these cytokines are additive. IFNγ induced STAT1 and TNFα induced NF-κB play a role in the induction of LCN2. In the LCN2 promoter, one NF-κB binding site and four STAT1 binding sites were identified by in silico and in vitro approaches. MAPK (ERKs 1 and 2) activation was required for the IFNγ and TNFα induction of LCN2 expression, but did not affect the nuclear translocation or DNA binding activity of STAT1 or NF-κB. The NF-κB binding site and the STAT1 binding sites we identified in vitro were confirmed by in vivo studies. Transfection of a LCN2 promoter/luciferase reporter construct confirmed acute activation by IFNγ and TNFα. Our studies identify mechanisms involved in the actions of cytokines secreted from immune cells in adipose tissue that induce LCN2 expression in conditions of obesity and T2DM.
Collapse
|
18
|
Iwata M, Ochi H, Hara Y, Tagawa M, Koga D, Okawa A, Asou Y. Initial responses of articular tissues in a murine high-fat diet-induced osteoarthritis model: pivotal role of the IPFP as a cytokine fountain. PLoS One 2013; 8:e60706. [PMID: 23593289 PMCID: PMC3625196 DOI: 10.1371/journal.pone.0060706] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2012] [Accepted: 03/01/2013] [Indexed: 01/14/2023] Open
Abstract
Obesity and high body mass index are associated with a higher incidence of osteoarthritis (OA). The aim of this study is to investigate the involvement of the infrapatellar fat pad (IPFP) in the sub-acute effect of a high fat diet (HFD) on the development of knee-OA. C57BL/6J male mice were fed either a HFD or a normal diet beginning at seven weeks of age. Tissue sections were evaluated with immunohistological analysis. The IPFP was excised, and mRNA expression profiles were compared using real-time RT-PCR analysis. Osteoarthritic changes were initiated in the HFD group after eight weeks of the HFD. Increased synovial cell number and angiogenesis at the anterior edge of the tibial plateau were exhibited prior to osteophyte formation. Quantitative histological analysis indicated that osteophyte volume was significantly increased in the HFD group after eight weeks, along with an increase in the IPFP volume, the size of individual adipocytes and the number of vessels in the IPFP. Histomorphometrical analysis revealed osteophyte area was significantly associated with IPFP area, individual adipocyte area and vascular area. Real-time RT-PCR analysis demonstrated elevated mRNA expression of inflammatory cytokines, growth factor, and adipokines in the IPFP after eight weeks of the HFD. These findings are in parallel with increased expression of the CD68 macrophage marker after eight weeks of the HFD. Expression levels of the adipokines were significantly correlated with expression of TNF-α, VEGF and TGF-β. Immunohistological analysis revealed that the Nampt protein was highly expressed in the IPFP especially around the site of osteophyte formation. Apoptosis and proliferation of chondrocytes were both enhanced at the site of osteophyte formation, indicating higher cell turnover at this region. These observations suggest the IPFP plays a pivotal role in the formation of osteophytes and functions as a secretory organ in response to a HFD.
Collapse
Affiliation(s)
- Munetaka Iwata
- Division of Veterinary Surgery, School of Veterinary Medicine, Nippon Veterinary and Life Science University, Musashino-shi, Tokyo Japan
| | - Hiroki Ochi
- Laboratory of Veterinary Microbiology, Nippon Veterinary and Life Science University, Musashino-shi, Tokyo Japan
| | - Yasushi Hara
- Division of Veterinary Surgery, School of Veterinary Medicine, Nippon Veterinary and Life Science University, Musashino-shi, Tokyo Japan
| | - Masahiro Tagawa
- Division of Veterinary Surgery, School of Veterinary Medicine, Nippon Veterinary and Life Science University, Musashino-shi, Tokyo Japan
| | - Daisuke Koga
- Department of Orthopaedic Surgery, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo Japan
| | - Atsushi Okawa
- Department of Orthopaedic Surgery, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo Japan
| | - Yoshinori Asou
- Department of Orthopaedic Surgery, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo Japan
- * E-mail:
| |
Collapse
|
19
|
Induction mechanism of lipocalin-2 expression by co-stimulation with interleukin-1β and interferon-γ in RINm5F beta-cells. Biochem Biophys Res Commun 2013; 434:577-83. [PMID: 23583381 DOI: 10.1016/j.bbrc.2013.03.117] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2013] [Accepted: 03/27/2013] [Indexed: 11/20/2022]
Abstract
Lipocalin-2 (LCN-2) was known to play a role in obesity and insulin resistance, however, little is known about the expression of LCN-2 in pancreatic islet β-cells. We examined the molecular mechanisms by which proinflammatory cytokines interleukin-1β (IL-1β) and interferon-γ (IFN-γ) induce LCN-2 expression in RINm5F β-cells. IL-1β significantly induced LCN-2 expression while IFN-γ alone did not induce it. IFN-γ significantly potentiated IL-1β-induced LCN-2 protein and mRNA expression. However, promoter study and EMSA showed that IFN-γ failed to potentiate IL-1β-induced LCN-2 promoter activity and binding activity of transcription factors on LCN-2 promoter. Furthermore, LCN-2 mRNA stability and transcription factors NF-κB and STAT-1 were not involved in the stimulatory effect of IFN-γ on IL-1β-induced LCN-2 expression. Meanwhile, Western Blot and promoter analyses showed that NF-κB was a key factor in IL-1β-induced LCN-2 expression. Collectively, IL-1β induces LCN-2 expression via NF-κB activation in RINm5F β-cells. IFN-γ potentiates IL-1β-induced LCN-2 expression at mRNA and protein levels, but not at promoter level and the stimulatory effect of IFN-γ is independent of NF-κB and STAT-1 activation. These data suggest that LCN-2 may play a role in β-cell function under an inflammatory condition.
Collapse
|
20
|
Fluctuating roles of matrix metalloproteinase-9 in oral squamous cell carcinoma. ScientificWorldJournal 2013; 2013:920595. [PMID: 23365550 PMCID: PMC3556887 DOI: 10.1155/2013/920595] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2012] [Accepted: 12/10/2012] [Indexed: 12/12/2022] Open
Abstract
One hallmark of cancer is the degradation of the extracellular matrix (ECM), which is caused by proteinases. In oral cancers, matrix metalloproteinases (MMPs), especially MMP-9, are associated with this degradation. MMPs break down the ECM allowing cancer to spread; they also release various factors from their cryptic sites, including cytokines. These factors modulate cell behavior and enhance cancer progression by regulating angiogenesis, migration, proliferation, and invasion. The development of early metastases is typical for oral cancer, and increased MMP-9 expression is associated with a poor disease prognosis. However, many studies fail to relate MMP-9 expression with metastasis formation. Contrary to earlier models, recent studies show that MMP-9 plays a protective role in oral cancers. Therefore, the role of MMP-9 is complicated and may fluctuate throughout the different types and stages of oral cancers.
Collapse
|
21
|
Sugihara T, Murano H, Nakamura M, Tanaka K. In Vivo Partial Bystander Study in a Mouse Model by Chronic Medium-Dose-Rate γ-Ray Irradiation. Radiat Res 2013; 179:221-31. [DOI: 10.1667/rr3081.1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Takashi Sugihara
- Department of Radiobiology, Institute for Environmental Sciences, 2-121 Hacchazawa Takahoko, Rokkasho, Kamikita, Aomori 039-3213, Japan
| | - Hayato Murano
- Tohoku Environmental Sciences Services Corporation, 330-2 Noduki, Obuchi, Rokkasho, Kamikita, Aomori 039-3212, Japan
| | - Masako Nakamura
- Tohoku Environmental Sciences Services Corporation, 330-2 Noduki, Obuchi, Rokkasho, Kamikita, Aomori 039-3212, Japan
| | - Kimio Tanaka
- Department of Radiobiology, Institute for Environmental Sciences, 2-121 Hacchazawa Takahoko, Rokkasho, Kamikita, Aomori 039-3213, Japan
| |
Collapse
|
22
|
Damirchi A, Rahmani-Nia F, Mehrabani J. Lipocalin-2: Response to a Progressive Treadmill Protocol in Obese and Normal-weight Men. Asian J Sports Med 2012; 2:44-50. [PMID: 22375217 PMCID: PMC3289189 DOI: 10.5812/asjsm.34821] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/03/2011] [Accepted: 02/20/2011] [Indexed: 11/16/2022] Open
Abstract
Purpose
Lipocalin-2 (Lcn2), a newer adipocyte-secreted acute phase protein, was recently reported to be correlated with potential effects on obesity and inflammation. The reaction of this protein to progressive exercise has not been evaluated yet. This study was designed to compare the serum Lcn2 and high-sensitivity C-reactive protein (hs-CRP) levels after participating in an acute bout of treadmill protocol in obese and normal-weight men. Methods
Nine obese (aged: 43.2±4.6 yrs and body mass index (BMI): 31.4±1.6 kg/m2) and 9 normal-weight (aged: 42.9±4.4 yrs and BMI: 23.03±1.7 kg/m2; mean ± SD) sedentary men selected randomly from volunteers performed a single bout of exercise according to the treadmill Bruce protocol. Results
Before the exercise, Lcn2 level was higher in obese than normal-weight individuals (P<0.05). A significant increase in Lcn2, hs-CRP, white blood cells (WBC) and insulin resistance index was observed after the exercise in both groups (P<0.05). The level of Lcn2, hs-CRP and WBC increase was more significant in obese individuals than normal-weight subjects after the exercise (P<0.05). Conclusions It seems that the levels of Lcn2 and other inflammatory markers elevated in obese and normal-weight men after participating in an exhaustive progressive exercise. These changes in obese men were considerable.
Collapse
Affiliation(s)
- Arsalan Damirchi
- Corresponding Author: Address: Department of Exercise Physiology, Faculty of Physical Education and Sport Sciences, University of Guilan, PO. Box: 41635-1438, Rasht, Iran. E-mail:
| | | | | |
Collapse
|
23
|
Liu JTC, Song E, Xu A, Berger T, Mak TW, Tse HF, Law IKM, Huang B, Liang Y, Vanhoutte PM, Wang Y. Lipocalin-2 deficiency prevents endothelial dysfunction associated with dietary obesity: role of cytochrome P450 2C inhibition. Br J Pharmacol 2012; 165:520-31. [PMID: 21740414 PMCID: PMC3268203 DOI: 10.1111/j.1476-5381.2011.01587.x] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2011] [Revised: 06/26/2011] [Accepted: 06/29/2011] [Indexed: 11/28/2022] Open
Abstract
BACKGROUND AND PURPOSE Lipocalin-2 is a pro-inflammatory adipokine up-regulated in obese human subjects and animal models. Its circulating levels are positively correlated with the unfavourable lipid profiles, elevated blood pressure and insulin resistance index. Augmented lipocalin-2 has been found in patients with cardiovascular abnormalities.The present study was designed to investigate the role of lipocalin-2 in regulating endothelial function and vascular reactivity. EXPERIMENTAL APPROACH Wild-type and lipocalin-2 knockout (Lcn2-KO) mice were fed with either a standard chow or a high-fat diet. Blood pressures and endothelium-dependent relaxations/contractions were monitored at 2 week intervals. RESULTS Systolic blood pressure was elevated by high-fat diet in wild-type mice but not in Lcn2-KO mice. Endothelial dysfunction, reflected by the impaired endothelium-dependent relaxations to insulin and augmented endothelium-dependent contractions to ACh, was induced by high-fat diet in wild-type mice. In contrast, Lcn2-KO mice were largely protected from the deterioration of endothelial function caused by dietary challenges. The eNOS dimer/monomer ratio, NO bioavailability, basal and insulin-stimulated PKB/eNOS phosphorylation responses were higher in aortae of Lcn2-KO mice. Administration of lipocalin-2 attenuated endothelium-dependent relaxations to insulin and promoted endothelium-dependent contractions to ACh. It induced eNOS uncoupling and elevated COX expression in the arteries. Treatment with sulphaphenazole, a selective inhibitor of cytochrome P450 2C9, improved endothelial function in wild-type mice and blocked the effects of lipocalin-2 on both endothelium-dependent relaxations to insulin and endothelium-dependent contractions to ACh, as well as eNOS uncoupling. CONCLUSIONS Lipocalin-2, by modulating cytochrome P450 2C9 activity, is critically involved in diet-induced endothelial dysfunction.
Collapse
Affiliation(s)
- Jacky TC Liu
- Department of Pharmacology and Pharmacy, the University of Hong KongHong Kong
| | - Erfei Song
- Department of Pharmacology and Pharmacy, the University of Hong KongHong Kong
| | - Aimin Xu
- Department of Pharmacology and Pharmacy, the University of Hong KongHong Kong
- Department of Medicine, the University of Hong KongHong Kong
| | - Thorsten Berger
- The Campbell Family Institute for Breast Cancer Research and the Ontario Cancer Institute, University Health NetworkToronto, Canada
| | - Tak W Mak
- The Campbell Family Institute for Breast Cancer Research and the Ontario Cancer Institute, University Health NetworkToronto, Canada
| | - Hung-Fat Tse
- Department of Medicine, the University of Hong KongHong Kong
| | - Ivy KM Law
- Department of Pharmacology and Pharmacy, the University of Hong KongHong Kong
| | - Bosheng Huang
- Department of Pharmacology and Pharmacy, the University of Hong KongHong Kong
| | - Yan Liang
- Department of Pharmacology and Pharmacy, the University of Hong KongHong Kong
| | - Paul M Vanhoutte
- Department of Pharmacology and Pharmacy, the University of Hong KongHong Kong
| | - Yu Wang
- Department of Pharmacology and Pharmacy, the University of Hong KongHong Kong
| |
Collapse
|
24
|
Abstract
Adipose tissue controls energy homeostasis and systemic insulin sensitivity through the elaboration of a series of cytokines and hormones, collectively termed "adipokines." We and others have identified Lcn2 as a novel adipokine, but its exact role in obesity-induced insulin resistance remains controversial. The aim of this study was to examine the metabolic phenotype of Lcn2(-/-) mice to clarify the role of Lcn2 in metabolism. Male and female Lcn2(-/-) and wild-type (WT) littermates were placed on either chow or high-fat diet (HFD) to characterize their metabolic phenotype. Studies included body weight and body composition, glucose and insulin tolerance tests, and adipokine expression studies in serum and in white adipose tissue (WAT). Neither chow nor HFD cohorts showed any differences in body weight or body composition. Chow-fed Lcn2(-/-) mice did not exhibit any difference in glucose homeostasis compared with WT mice. Fasting serum glucose levels were lower in the chow-fed Lcn2(-/-) mice, but this finding was not seen in the HFD cohort. Serum adiponectin, leptin, resistin, and RBP4 levels were not different between WT and Lcn2(-/-) on chow diet. HFD-fed male Lcn2(-/-) mice did display a small improvement in glucose tolerance, but no difference in insulin sensitivity was seen in either male or female Lcn2(-/-) mice on HFD. We conclude that the global ablation of Lcn2 has a minimal effect on obesity-associated glucose intolerance but does not appear to affect either age- or obesity-mediated insulin resistance in vivo.
Collapse
Affiliation(s)
- Lucy S Jun
- Division of Endocrinology, Diabetes, and Metabolism, Beth Israel Deaconess Medical Center, Boston, Massachusetts 02115, USA
| | | | | |
Collapse
|
25
|
Gómez R, Conde J, Scotece M, Gómez-Reino JJ, Lago F, Gualillo O. What's new in our understanding of the role of adipokines in rheumatic diseases? Nat Rev Rheumatol 2011; 7:528-36. [PMID: 21808287 DOI: 10.1038/nrrheum.2011.107] [Citation(s) in RCA: 219] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Important advances in our understanding of the relationships between adipokines, inflammation and the immune response have been achieved in the past 10 years. White adipose tissue has emerged as a highly dynamic organ that releases a plethora of immune and inflammatory mediators that are involved in numerous diseases, including not only rheumatic diseases such as rheumatoid arthritis, osteoarthritis and systemic lupus erythematosus, but also cardiovascular and metabolic complications that are frequently observed in rheumatic diseases. Our rapidly growing knowledge of adipokine biology is revealing the complexity of these amazing proteins, thereby redefining white adipose tissue as a key element of the inflammatory and immune response in rheumatic diseases. Adipokines exert potent modulatory actions on target tissues and cells involved in rheumatic disease, including cartilage, synovium, bone and various immune cells. In this Review, we describe the most recent advances in adipokine research in the context of rheumatic diseases, focusing primarily on leptin, adiponectin, visfatin and resistin, and also the potential role of newly identified adipokines such as chemerin, lipocalin 2 and serum amyloid A3.
Collapse
Affiliation(s)
- Rodolfo Gómez
- SERGAS, Santiago University Clinical Hospital, Research Laboratory, Institute of Medical Research, Travesía de la Choupana, Santiago de Compostela, Spain
| | | | | | | | | | | |
Collapse
|
26
|
Damirchi A, Rahmani-Nia F, Mehrabani J. Lipocalin-2: Response to a short-term treadmill protocol in obese and normal-weight men. JOURNAL OF HUMAN SPORT AND EXERCISE 2011. [DOI: 10.4100/jhse.2011.61.07] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
|
27
|
Stepan H, Philipp A, Reiche M, Klostermann K, Schrey S, Reisenbüchler C, Lossner U, Kratzsch J, Bluher M, Stumvoll M, Fasshauer M. Serum levels of the adipokine lipocalin-2 are increased in preeclampsia. J Endocrinol Invest 2010; 33:629-32. [PMID: 20208456 DOI: 10.1007/bf03346661] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
BACKGROUND Preeclampsia (PE) is a serious complication in pregnancy which increases the future risk for vascular and metabolic disease in both mother and newborn. Recently, lipocalin-2 has been introduced as a novel adipokine which contributes to obesity, insulin resistance, and vascular disease. AIM In the current study, we investigated lipocalin-2 serum levels in PE patients as compared to healthy gestational age-matched controls. SUBJECTS AND METHODS Lipocalin-2 serum concentrations were quantified by enzyme-linked immunosorbent assay in control (no.=22) and PE (no.=22) patients. Furthermore, lipocalin-2 levels were correlated to clinical and biochemical measures of renal function, glucose, and lipid metabolism, as well as inflammation. RESULTS Median maternal lipocalin-2 concentrations were significantly increased in PE (121.3 μg/l) as compared to control subjects (99.8 μg/l) (p<0.05). Furthermore, circulating lipocalin 2 correlated positively with diastolic blood pressure, creatinine, and C reactive protein. In multivariate analyses, creatinine and C reactive protein remained independently associated with lipocalin-2 levels. CONCLUSIONS We demonstrate that maternal lipocalin-2 concentrations are significantly increased in PE. Furthermore, markers of renal function and inflammation independently predict circulating lipocalin-2.
Collapse
Affiliation(s)
- H Stepan
- Department of Obstetrics, University of Leipzig, Liebigstrasse 20, Leipzig, Germany
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
28
|
Peritoneal adipocytes and their role in inflammation during peritoneal dialysis. Mediators Inflamm 2010; 2010:495416. [PMID: 20454534 PMCID: PMC2864891 DOI: 10.1155/2010/495416] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2009] [Revised: 01/27/2010] [Accepted: 02/17/2010] [Indexed: 01/04/2023] Open
Abstract
Adipose tissue is a major site of chronic inflammation associated with peritoneal dialysis (PD) frequently complicating peritonitis. Adiposity-associated inflammation plays a significant contributory role in the development of chronic inflammation in patients undergoing maintenance PD. However, the molecular and cellular mechanisms of this link remain uncertain. Adipose tissue synthesizes different adipokines and cytokines that orchestrate and regulate inflammation, insulin action, and glucose metabolism locally and systemically. In return, inflammation retards adipocyte differentiation and further exacerbates adipose dysfunction and inflammation. An understanding of the inflammatory roles played by adipose tissue during PD and the healing mechanism of injured mesothelium will help to devise new therapeutic approach to slow the progression of peritoneal damage during peritoneal dialysis. This article reviews the roles of peritoneal adipose tissue in chronic peritoneal inflammation under PD and in serosal repair during PD.
Collapse
|
29
|
Increased adipose tissue expression of lipocalin-2 in obesity is related to inflammation and matrix metalloproteinase-2 and metalloproteinase-9 activities in humans. J Mol Med (Berl) 2009; 87:803-13. [PMID: 19466389 DOI: 10.1007/s00109-009-0486-8] [Citation(s) in RCA: 128] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2009] [Revised: 05/05/2009] [Accepted: 05/08/2009] [Indexed: 10/20/2022]
Abstract
Lipocalin-2 (LCN2) is a novel adipokine with potential roles in obesity, insulin resistance, and inflammation. The aim of the present work was to evaluate the effect of obesity on circulating concentrations and gene and protein expression levels of LCN2 in human visceral adipose tissue (VAT) as well as its involvement in inflammation. VAT biopsies from 47 subjects were used in the study. Real-time PCR and Western-blot analyses were performed to quantify levels of LCN2 in VAT as well as the association with other genes implicated in inflammatory pathways. Forty-four serum samples were used to analyze the circulating concentrations of LCN2. Zymography analysis was used to determine the activity of matrix metalloproteinase (MMP) in VAT. Obese patients exhibited increased mRNA (p < 0.0001) and protein (p = 0.017) expression levels of LCN2 compared to lean subjects. Although no differences in plasma LCN2 concentrations were observed, increased circulating LCN2/MMP-9 complex levels were found (p = 0.038) in the obese group. Moreover, obese individuals showed increased (p < 0.01) activity of MMP-2 and MMP-9/LCN2 complex, while a positive correlation (p < 0.01) between MMP-2 and MMP-9 activities and BMI was observed. Gene and protein expression levels of LCN2 in VAT were positively associated with inflammatory markers (p < 0.01). These findings represent the first observation that mRNA and protein levels of LCN2 are increased in human VAT of obese subjects. Furthermore, LCN2 is associated with MMP-2 and MMP-9 activities as well as with pro-inflammatory markers suggesting its potential involvement in the low-grade chronic inflammation accompanying obesity.
Collapse
|
30
|
Kralisch S, Sommer G, Weise S, Lipfert J, Lossner U, Kamprad M, Schröck K, Bluher M, Stumvoll M, Fasshauer M. Interleukin-1beta is a positive regulator of TIARP/STAMP2 gene and protein expression in adipocytes in vitro. FEBS Lett 2009; 583:1196-200. [PMID: 19289123 DOI: 10.1016/j.febslet.2009.03.015] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2009] [Revised: 03/01/2009] [Accepted: 03/05/2009] [Indexed: 11/25/2022]
Abstract
The impact of interleukin (IL)-1beta on tumor necrosis factor alpha-induced adipose-related protein (TIARP)/six-transmembrane protein of prostate 2 (STAMP2) was determined in adipocytes. TIARP/STAMP2 mRNA synthesis was significantly stimulated by IL-1beta in a dose- and time-dependent fashion in 3T3-L1 adipocytes. Signaling studies suggested that janus kinase 2, nuclear factor kappaB, and p44/42 mitogen-activated protein kinase are involved in IL-1beta-induced TIARP/STAMP2 mRNA expression. Furthermore, IL-1beta, TNFalpha, and IL-6 showed synergistic stimulatory effects on TIARP/STAMP2 gene expression. Moreover, both TIARP/STAMP2 mRNA synthesis and protein expression were induced by IL-1beta in fully differentiated human mesenchymal stem cell-derived adipocytes (hMSC-Ad). Taken together, TIARP/STAMP2 is highly upregulated in 3T3-L1 cells and hMSC-Ad by IL-1beta and might, therefore, modulate proinflammatory and insulin resistance-inducing effects of IL-1beta.
Collapse
Affiliation(s)
- Susan Kralisch
- University of Leipzig, Department of Internal Medicine III, Leipzig, Germany
| | | | | | | | | | | | | | | | | | | |
Collapse
|
31
|
Kralisch S, Weise S, Sommer G, Lipfert J, Lossner U, Bluher M, Stumvoll M, Fasshauer M. Interleukin-1beta induces the novel adipokine chemerin in adipocytes in vitro. ACTA ACUST UNITED AC 2009; 154:102-6. [PMID: 19233230 DOI: 10.1016/j.regpep.2009.02.010] [Citation(s) in RCA: 111] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2008] [Revised: 02/05/2009] [Accepted: 02/09/2009] [Indexed: 01/06/2023]
Abstract
Chemerin has recently been characterized as a novel adipokine playing a crucial role in adipocyte differentiation and insulin signalling. In the current study, the impact of insulin resistance-inducing and proinflammatory interleukin (IL)-1beta on chemerin protein secretion and mRNA expression was determined in 3T3-L1 adipocytes. Interestingly, IL-1beta significantly induced chemerin protein secretion almost 1.3-fold from 5.89 ng/ml (basal) to 7.52 ng/ml. Furthermore, chemerin mRNA synthesis was significantly stimulated by IL-1beta in a dose-dependent fashion with 1.5-fold induction seen at IL-1beta concentrations as low as 0.07 ng/ml and maximal 2.6-fold upregulation found at 2 ng/ml effector. Induction of chemerin mRNA by IL-1beta was time-dependent in both 3T3-L1 adipocytes and brown fat cells. Signalling studies suggested that Janus kinase 2, nuclear factor kappa B, p44/42 mitogen-activated protein kinase, and phosphatidylinositol 3-kinase are involved in IL-1beta-induced chemerin mRNA expression. Furthermore, recombinant chemerin downregulated insulin-stimulated glucose uptake. Taken together, we show that chemerin is upregulated in fat cells by IL-1beta and might modulate the effects of IL-1beta on adipocyte metabolism and insulin sensitivity.
Collapse
Affiliation(s)
- Susan Kralisch
- University of Leipzig, Department of Internal Medicine III, 04103 Leipzig, Germany
| | | | | | | | | | | | | | | |
Collapse
|