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Cimini M, Hansmann UHE, Gonzalez C, Chesney AD, Truongcao MM, Gao E, Wang T, Roy R, Forte E, Mallaredy V, Thej C, Magadum A, Joladarashi D, Benedict C, Koch WJ, Tükel Ç, Kishore R. Podoplanin Positive Cell-derived Extracellular Vesicles Contribute to Cardiac Amyloidosis After Myocardial Infarction. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.06.28.601297. [PMID: 39005419 PMCID: PMC11244852 DOI: 10.1101/2024.06.28.601297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/16/2024]
Abstract
Background Amyloidosis is a major long-term complication of chronic disease; however, whether it represents one of the complications of post-myocardial infarction (MI) is yet to be fully understood. Methods Using wild-type and knocked-out MI mouse models and characterizing in vitro the exosomal communication between bone marrow-derived macrophages and activated mesenchymal stromal cells (MSC) isolated after MI, we investigated the mechanism behind Serum Amyloid A 3 (SAA3) protein overproduction in injured hearts. Results Here, we show that amyloidosis occurs after MI and that amyloid fibers are composed of macrophage-derived SAA3 monomers. SAA3 overproduction in macrophages is triggered by exosomal communication from a subset of activated MSC, which, in response to MI, acquire the expression of a platelet aggregation-inducing type I transmembrane glycoprotein named Podoplanin (PDPN). Cardiac MSC PDPN+ communicate with and activate macrophages through their extracellular vesicles or exosomes. Specifically, MSC PDPN+ derived exosomes (MSC PDPN+ Exosomes) are enriched in SAA3 and exosomal SAA3 protein engages with Toll-like receptor 2 (TRL2) on macrophages, triggering an overproduction and impaired clearance of SAA3 proteins, resulting in aggregation of SAA3 monomers as rigid amyloid deposits in the extracellular space. The onset of amyloid fibers deposition alongside extra-cellular-matrix (ECM) proteins in the ischemic heart exacerbates the rigidity and stiffness of the scar, hindering the contractility of viable myocardium and overall impairing organ function. Using SAA3 and TLR2 deficient mouse models, we show that SAA3 delivered by MSC PDPN+ exosomes promotes post-MI amyloidosis. Inhibition of SAA3 aggregation via administration of a retro-inverso D-peptide, specifically designed to bind SAA3 monomers, prevents the deposition of SAA3 amyloid fibrils, positively modulates the scar formation, and improves heart function post-MI. Conclusion Overall, our findings provide mechanistic insights into post-MI amyloidosis and suggest that SAA3 may be an attractive target for effective scar reversal after ischemic injury and a potential target in multiple diseases characterized by a similar pattern of inflammation and amyloid deposition. NOVELTY AND SIGNIFICANCE What is known? Accumulation of rigid amyloid structures in the left ventricular wall impairs ventricle contractility.After myocardial infarction cardiac Mesenchymal Stromal Cells (MSC) acquire Podoplanin (PDPN) to better interact with immune cells.Amyloid structures can accumulate in the heart after chronic inflammatory conditions. What information does this article contribute? Whether accumulation of cumbersome amyloid structures in the ischemic scar impairs left ventricle contractility, and scar reversal after myocardial infarction (MI) has never been investigated.The pathophysiological relevance of PDPN acquirement by MSC and the functional role of their secreted exosomes in the context of post-MI cardiac remodeling has not been investigated.Amyloid structures are present in the scar after ischemia and are composed of macrophage-derived Serum Amyloid A (SAA) 3 monomers, although mechanisms of SAA3 overproduction is not established. SUMMARY OF NOVELTY AND SIGNIFICANCE Here, we report that amyloidosis, a secondary phenomenon of an already preexisting and prolonged chronic inflammatory condition, occurs after MI and that amyloid structures are composed of macrophage-derived SAA3 monomers. Frequently studied cardiac amyloidosis are caused by aggregation of immunoglobulin light chains, transthyretin, fibrinogen, and apolipoprotein in a healthy heart as a consequence of systemic chronic inflammation leading to congestive heart failure with various types of arrhythmias and tissue stiffness. Although chronic MI is considered a systemic inflammatory condition, studies regarding the possible accumulation of amyloidogenic proteins after MI and the mechanisms involved in that process are yet to be reported. Here, we show that SAA3 overproduction in macrophages is triggered in a Toll-like Receptor 2 (TLR2)-p38MAP Kinase-dependent manner by exosomal communication from a subset of activated MSC, which, in response to MI, express a platelet aggregation-inducing type I transmembrane glycoprotein named Podoplanin. We provide the full mechanism of this phenomenon in murine models and confirm SAA3 amyloidosis in failing human heart samples. Moreover, we developed a retro-inverso D-peptide therapeutic approach, "DRI-R5S," specifically designed to bind SAA3 monomers and prevent post-MI aggregation and deposition of SAA3 amyloid fibrils without interfering with the innate immune response.
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Schalich KM, Koganti PP, Castillo JM, Reiff OM, Cheong SH, Selvaraj V. The uterine secretory cycle: recurring physiology of endometrial outputs that setup the uterine luminal microenvironment. Physiol Genomics 2024; 56:74-97. [PMID: 37694291 DOI: 10.1152/physiolgenomics.00035.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Revised: 09/08/2023] [Accepted: 09/08/2023] [Indexed: 09/12/2023] Open
Abstract
Conserved in female reproduction across all mammalian species is the estrous cycle and its regulation by the hypothalamic-pituitary-gonadal (HPG) axis, a collective of intersected hormonal events that are crucial for ensuring uterine fertility. Nonetheless, knowledge of the direct mediators that synchronously shape the uterine microenvironment for successive yet distinct events, such as the transit of sperm and support for progressive stages of preimplantation embryo development, remain principally deficient. Toward understanding the timed endometrial outputs that permit luminal events as directed by the estrous cycle, we used Bovidae as a model system to uniquely surface sample and study temporal shifts to in vivo endometrial transcripts that encode for proteins destined to be secreted. The results revealed the full quantitative profile of endometrial components that shape the uterine luminal microenvironment at distinct phases of the estrous cycle (estrus, metestrus, diestrus, and proestrus). In interpreting this comprehensive log of stage-specific endometrial secretions, we define the "uterine secretory cycle" and extract a predictive understanding of recurring physiological actions regulated within the uterine lumen in anticipation of sperm and preimplantation embryonic stages. This repetitive microenvironmental preparedness to sequentially provide operative support was a stable intrinsic framework, with only limited responses to sperm or embryos if encountered in the lumen within the cyclic time period. In uncovering the secretory cycle and unraveling realistic biological processes, we present novel foundational knowledge of terminal effectors controlled by the HPG axis to direct a recurring sequence of vital functions within the uterine lumen.NEW & NOTEWORTHY This study unravels the recurring sequence of changes within the uterus that supports vital functions (sperm transit and development of preimplantation embryonic stages) during the reproductive cycle in female Ruminantia. These data present new systems knowledge in uterine reproductive physiology crucial for setting up in vitro biomimicry and artificial environments for assisted reproduction technologies for a range of mammalian species.
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Affiliation(s)
- Kasey M Schalich
- Department of Animal Science, College of Agriculture and Life Sciences, Cornell University, Ithaca, New York, United States
| | - Prasanthi P Koganti
- Department of Animal Science, College of Agriculture and Life Sciences, Cornell University, Ithaca, New York, United States
| | - Juan M Castillo
- Department of Clinical Sciences, Veterinary College, Cornell University, Ithaca, New York, United States
| | - Olivia M Reiff
- Department of Animal Science, College of Agriculture and Life Sciences, Cornell University, Ithaca, New York, United States
| | - Soon Hon Cheong
- Department of Clinical Sciences, Veterinary College, Cornell University, Ithaca, New York, United States
| | - Vimal Selvaraj
- Department of Animal Science, College of Agriculture and Life Sciences, Cornell University, Ithaca, New York, United States
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den Hartigh LJ, May KS, Zhang XS, Chait A, Blaser MJ. Serum amyloid A and metabolic disease: evidence for a critical role in chronic inflammatory conditions. Front Cardiovasc Med 2023; 10:1197432. [PMID: 37396595 PMCID: PMC10311072 DOI: 10.3389/fcvm.2023.1197432] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Accepted: 05/15/2023] [Indexed: 07/04/2023] Open
Abstract
Serum amyloid A (SAA) subtypes 1-3 are well-described acute phase reactants that are elevated in acute inflammatory conditions such as infection, tissue injury, and trauma, while SAA4 is constitutively expressed. SAA subtypes also have been implicated as playing roles in chronic metabolic diseases including obesity, diabetes, and cardiovascular disease, and possibly in autoimmune diseases such as systemic lupus erythematosis, rheumatoid arthritis, and inflammatory bowel disease. Distinctions between the expression kinetics of SAA in acute inflammatory responses and chronic disease states suggest the potential for differentiating SAA functions. Although circulating SAA levels can rise up to 1,000-fold during an acute inflammatory event, elevations are more modest (∼5-fold) in chronic metabolic conditions. The majority of acute-phase SAA derives from the liver, while in chronic inflammatory conditions SAA also derives from adipose tissue, the intestine, and elsewhere. In this review, roles for SAA subtypes in chronic metabolic disease states are contrasted to current knowledge about acute phase SAA. Investigations show distinct differences between SAA expression and function in human and animal models of metabolic disease, as well as sexual dimorphism of SAA subtype responses.
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Affiliation(s)
- Laura J. den Hartigh
- Department of Medicine, Division of Metabolism, Endocrinology, and Nutrition, University of Washington, Seattle, WA, United States
- Diabetes Institute, University of Washington, Seattle, WA, United States
| | - Karolline S. May
- Department of Medicine, Division of Metabolism, Endocrinology, and Nutrition, University of Washington, Seattle, WA, United States
- Diabetes Institute, University of Washington, Seattle, WA, United States
| | - Xue-Song Zhang
- Center for Advanced Biotechnology and Medicine, Rutgers University, Piscataway, NJ, United States
| | - Alan Chait
- Department of Medicine, Division of Metabolism, Endocrinology, and Nutrition, University of Washington, Seattle, WA, United States
- Diabetes Institute, University of Washington, Seattle, WA, United States
| | - Martin J. Blaser
- Center for Advanced Biotechnology and Medicine, Rutgers University, Piscataway, NJ, United States
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4
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Non-alcoholic fatty liver disease and liver secretome. Arch Pharm Res 2022; 45:938-963. [PMCID: PMC9703441 DOI: 10.1007/s12272-022-01419-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Accepted: 11/15/2022] [Indexed: 11/29/2022]
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Leukocyte activation primes fibrinogen for proteolysis by mitochondrial oxidative stress. Redox Biol 2022; 51:102263. [PMID: 35158163 PMCID: PMC8844908 DOI: 10.1016/j.redox.2022.102263] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Accepted: 02/07/2022] [Indexed: 11/21/2022] Open
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Serum Amyloid A is not obligatory for high-fat, high-sucrose, cholesterol-fed diet-induced obesity and its metabolic and inflammatory complications. PLoS One 2022; 17:e0266688. [PMID: 35436297 PMCID: PMC9015120 DOI: 10.1371/journal.pone.0266688] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Accepted: 03/24/2022] [Indexed: 12/26/2022] Open
Abstract
Several studies in the past have reported positive correlations between circulating Serum amyloid A (SAA) levels and obesity. However, based on limited number of studies involving appropriate mouse models, the role of SAA in the development of obesity and obesity-related metabolic consequences has not been established. Accordingly, herein, we have examined the role of SAA in the development of obesity and its associated metabolic complications in vivo using mice deficient for all three inducible forms of SAA: SAA1.1, SAA2.1 and SAA3 (TKO). Male and female mice were rendered obese by feeding a high fat, high sucrose diet with added cholesterol (HFHSC) and control mice were fed rodent chow diet. Here, we show that the deletion of SAA does not affect diet-induced obesity, hepatic lipid metabolism or adipose tissue inflammation. However, there was a modest effect on glucose metabolism. The results of this study confirm previous findings that SAA levels are elevated in adipose tissues as well as in the circulation in diet-induced obese mice. However, the three acute phase SAAs do not play a causative role in the development of obesity or obesity-associated adipose tissue inflammation and dyslipidemia.
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Gálvez I, Navarro MC, Martín-Cordero L, Otero E, Hinchado MD, Ortega E. The Influence of Obesity and Weight Loss on the Bioregulation of Innate/Inflammatory Responses: Macrophages and Immunometabolism. Nutrients 2022; 14:nu14030612. [PMID: 35276970 PMCID: PMC8840693 DOI: 10.3390/nu14030612] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Revised: 01/24/2022] [Accepted: 01/27/2022] [Indexed: 12/12/2022] Open
Abstract
Obesity is characterized by low-grade inflammation and more susceptibility to infection, particularly viral infections, as clearly demonstrated in COVID-19. In this context, immunometabolism and metabolic flexibility of macrophages play an important role. Since inflammation is an inherent part of the innate response, strategies for decreasing the inflammatory response must avoid immunocompromise the innate defenses against pathogen challenges. The concept “bioregulation of inflammatory/innate responses” was coined in the context of the effects of exercise on these responses, implying a reduction in excessive inflammatory response, together with the preservation or stimulation of the innate response, with good transitions between pro- and anti-inflammatory macrophages adapted to each individual’s inflammatory set-point in inflammatory diseases, particularly in obesity. The question now is whether these responses can be obtained in the context of weight loss by dietary interventions (low-fat diet or abandonment of the high-fat diet) in the absence of exercise, which can be especially relevant for obese individuals with difficulties exercising such as those suffering from persistent COVID-19. Results from recent studies are controversial and do not point to a clear anti-inflammatory effect of these dietary interventions, particularly in the adipose tissue. Further research focusing on the innate response is also necessary.
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Affiliation(s)
- Isabel Gálvez
- Immunophyisiology Research Group, Instituto Universitario de Investigación Biosanitaria de Extremadura (INUBE), 06071 Badajoz, Spain; (I.G.); (M.C.N.); (L.M.-C.); (E.O.); (M.D.H.)
- Immunophysiology Research Group, Nursing Department, Faculty of Medicine and Health Sciences, University of Extremadura, 06071 Badajoz, Spain
| | - María Carmen Navarro
- Immunophyisiology Research Group, Instituto Universitario de Investigación Biosanitaria de Extremadura (INUBE), 06071 Badajoz, Spain; (I.G.); (M.C.N.); (L.M.-C.); (E.O.); (M.D.H.)
- Immunophysiology Research Group, Physiology Department, Faculty of Sciences, University of Extremadura, 06071 Badajoz, Spain
| | - Leticia Martín-Cordero
- Immunophyisiology Research Group, Instituto Universitario de Investigación Biosanitaria de Extremadura (INUBE), 06071 Badajoz, Spain; (I.G.); (M.C.N.); (L.M.-C.); (E.O.); (M.D.H.)
- Immunophysiology Research Group, Nursing Department, University Center of Plasencia, University of Extremadura, 10600 Plasencia, Spain
| | - Eduardo Otero
- Immunophyisiology Research Group, Instituto Universitario de Investigación Biosanitaria de Extremadura (INUBE), 06071 Badajoz, Spain; (I.G.); (M.C.N.); (L.M.-C.); (E.O.); (M.D.H.)
- Immunophysiology Research Group, Physiology Department, Faculty of Sciences, University of Extremadura, 06071 Badajoz, Spain
| | - María Dolores Hinchado
- Immunophyisiology Research Group, Instituto Universitario de Investigación Biosanitaria de Extremadura (INUBE), 06071 Badajoz, Spain; (I.G.); (M.C.N.); (L.M.-C.); (E.O.); (M.D.H.)
- Immunophysiology Research Group, Physiology Department, Faculty of Sciences, University of Extremadura, 06071 Badajoz, Spain
| | - Eduardo Ortega
- Immunophyisiology Research Group, Instituto Universitario de Investigación Biosanitaria de Extremadura (INUBE), 06071 Badajoz, Spain; (I.G.); (M.C.N.); (L.M.-C.); (E.O.); (M.D.H.)
- Immunophysiology Research Group, Physiology Department, Faculty of Sciences, University of Extremadura, 06071 Badajoz, Spain
- Correspondence: ; Tel.: +34-924-289-300
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Gomes D, Wang S, Goodspeed L, Turk KE, Wietecha T, Liu Y, Bornfeldt KE, O'Brien KD, Chait A, den Hartigh LJ. Comparison between genetic and pharmaceutical disruption of LDLR expression for the development of atherosclerosis. J Lipid Res 2022; 63:100174. [PMID: 35101425 PMCID: PMC8953673 DOI: 10.1016/j.jlr.2022.100174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 01/22/2022] [Accepted: 01/24/2022] [Indexed: 11/15/2022] Open
Affiliation(s)
- Diego Gomes
- Division of Metabolism, Endocrinology, and Nutrition, Department of Medicine, University of Washington, Seattle, WA, USA; Diabetes Institute, University of Washington, Seattle, WA, USA
| | - Shari Wang
- Division of Metabolism, Endocrinology, and Nutrition, Department of Medicine, University of Washington, Seattle, WA, USA; Diabetes Institute, University of Washington, Seattle, WA, USA
| | - Leela Goodspeed
- Division of Metabolism, Endocrinology, and Nutrition, Department of Medicine, University of Washington, Seattle, WA, USA; Diabetes Institute, University of Washington, Seattle, WA, USA
| | - Katherine E Turk
- Division of Metabolism, Endocrinology, and Nutrition, Department of Medicine, University of Washington, Seattle, WA, USA; Diabetes Institute, University of Washington, Seattle, WA, USA
| | - Tomasz Wietecha
- Diabetes Institute, University of Washington, Seattle, WA, USA; Department of Laboratory Medicine and Pathology, University of Washington, Seattle, WA, USA
| | - Yongjun Liu
- Department of Pathology and Laboratory Medicine, University of Wisconsin, Madison, WI, USA
| | - Karin E Bornfeldt
- Division of Metabolism, Endocrinology, and Nutrition, Department of Medicine, University of Washington, Seattle, WA, USA; Diabetes Institute, University of Washington, Seattle, WA, USA; Department of Laboratory Medicine and Pathology, University of Washington, Seattle, WA, USA
| | - Kevin D O'Brien
- Diabetes Institute, University of Washington, Seattle, WA, USA; Division of Cardiology, Department of Medicine, University of Washington, Seattle, WA, USA
| | - Alan Chait
- Division of Metabolism, Endocrinology, and Nutrition, Department of Medicine, University of Washington, Seattle, WA, USA; Diabetes Institute, University of Washington, Seattle, WA, USA
| | - Laura J den Hartigh
- Division of Metabolism, Endocrinology, and Nutrition, Department of Medicine, University of Washington, Seattle, WA, USA; Diabetes Institute, University of Washington, Seattle, WA, USA.
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Zhou J, Dai Y, Lin Y, Chen K. Association between serum amyloid A and rheumatoid arthritis: A systematic review and meta-analysis. Semin Arthritis Rheum 2021; 52:151943. [PMID: 35027248 DOI: 10.1016/j.semarthrit.2021.12.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 12/12/2021] [Accepted: 12/20/2021] [Indexed: 12/29/2022]
Abstract
BACKGROUNDS Consistent correlation of serum amyloid A (SAA) to rheumatoid arthritis (RA) is not completely established. The present study is to systematically summarize their relationship. METHODS Publications up to may 2021 were examined using key terms in the PubMed, Cochrane Library, Embase and China national knowledge infrastructure (CNKI) databases. RESULTS The total 33 studies, involving in 3524 RA cases and 3537 normal participants, were included. The pooled result indicated that the SAA level in the RA group was markedly higher than that in the control group [standardized mean difference (SMD) = 0.80, 95% CI (0.51, 1.08)]. By stratified analyses, the concentration of SAA was found to be gradually increased with the aggravation of RA. Additionally, the meta-analysis of correlation demonstrated that SAA levels were positively associated with the levels of disease activity score 28 (DAS28) [r = 0.55, 95% CI (0.15, 0.94)], erythrocyte sedimentation rate (ESR) [r = 0.65, 95% CI (0.53, 0.76)], C-reactive protein (CRP) [r = 0.92, 95% CI (0.57, 1.57)], rheumatoid factor (RF) [r = 0.24, 95% CI (0.09, 0.39)], interleukin 4 (IL-4) [r = 0.54, 95% CI (0.30, 0.78)], interleukin 6 (IL-6) [r = 0.46, 95% CI (0.27, 0.65)], interleukin 10 (IL-10) [r = 0.53, 95% CI (0.29, 0.77)], interleukin 17 (IL-17) [r = 0.52, 95% CI (0.27, 0.77)], and anti-cyclic citrullinated peptide antibody (A-CCP) [r = 0.32, 95% CI (0.15, 0.50)], but inversely linked with the levels of hemoglobin [r=-0.51, 95% CI (-0.84, -0.18)]. Furthermore, the allele of SAA 1.3 was actively related with increased risks of RA [OR=1.30, 95% CI (1.02, 1.65)] and of RA with amyloidosis [OR=2.06, 95% CI (1.63, 2.60)]. Besides, the genotype of SAA 1.3/1.3 was positively connected with the risks of RA [OR=1.56, 95% CI (1.00, 2.43)] and of RA with amyloidosis [OR=4.47, 95% CI (2.70, 7.41)]. CONCLUSIONS High levels of SAA might be associated with elevated risk of RA, and the concentration of SAA might be gradually increased with the aggravation of RA. Moreover, high levels of SAA might play a vital role in RA by enhancing the levels of DAS28, ESR, CRP, RF, IL-4, IL-6, IL-10, IL-17 and A-CCP, or by attenuating hemoglobin levels. More importantly, the allele of SAA 1.3 and genotype of SAA 1.3/1.3 might be the risk factor of RA and of RA with amyloidosis.
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Affiliation(s)
- Jielin Zhou
- Department of Nutrition and Food Hygiene, School of Public Health, Anhui Medical University, Hefei, Anhui 230032,China
| | - Yu Dai
- Department of Surgery, Suzhou Hospital of Anhui Medical University, Suzhou, Anhui 234000, China
| | - Yan Lin
- Department of Health Inspection and Quarantine, School of Public Health, Anhui Medical University, Hefei, Anhui 230032, China
| | - Keyang Chen
- Department of Nutrition and Food Hygiene, School of Public Health, Anhui Medical University, Hefei, Anhui 230032,China; Department of Health Inspection and Quarantine, School of Public Health, Anhui Medical University, Hefei, Anhui 230032, China.
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Shridas P, Patrick AC, Tannock LR. Role of Serum Amyloid A in Abdominal Aortic Aneurysm and Related Cardiovascular Diseases. Biomolecules 2021; 11:biom11121883. [PMID: 34944527 PMCID: PMC8699432 DOI: 10.3390/biom11121883] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Revised: 12/07/2021] [Accepted: 12/13/2021] [Indexed: 01/02/2023] Open
Abstract
Epidemiological data positively correlate plasma serum amyloid A (SAA) levels with cardiovascular disease severity and mortality. Studies by several investigators have indicated a causal role for SAA in the development of atherosclerosis in animal models. Suppression of SAA attenuates the development of angiotensin II (AngII)-induced abdominal aortic aneurysm (AAA) formation in mice. Thus, SAA is not just a marker for cardiovascular disease (CVD) development, but it is a key player. However, to consider SAA as a therapeutic target for these diseases, the pathway leading to its involvement needs to be understood. This review provides a brief description of the pathobiological significance of this enigmatic molecule. The purpose of this review is to summarize the data relevant to its role in the development of CVD, the pitfalls in SAA research, and unanswered questions in the field.
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Affiliation(s)
- Preetha Shridas
- Department of Internal Medicine, University of Kentucky, Lexington, KY 40536, USA
- Saha Cardiovascular Research Center, University of Kentucky, Lexington, KY 40536, USA
- Barnstable Brown Diabetes Center, University of Kentucky, Lexington, KY 40536, USA
| | - Avery C Patrick
- Pharmacology and Nutritional Sciences, University of Kentucky, Lexington, KY 40536, USA
| | - Lisa R Tannock
- Department of Internal Medicine, University of Kentucky, Lexington, KY 40536, USA
- Saha Cardiovascular Research Center, University of Kentucky, Lexington, KY 40536, USA
- Barnstable Brown Diabetes Center, University of Kentucky, Lexington, KY 40536, USA
- Veterans Affairs Lexington, University of Kentucky, Lexington, KY 40536, USA
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Chait A, Wang S, Goodspeed L, Gomes D, Turk KE, Wietecha T, Tang J, Storey C, O'Brien KD, Rubinow KB, Tang C, Vaisar T, Gharib SA, Lusis AJ, Den Hartigh LJ. Sexually Dimorphic Relationships Among Saa3 (Serum Amyloid A3), Inflammation, and Cholesterol Metabolism Modulate Atherosclerosis in Mice. Arterioscler Thromb Vasc Biol 2021; 41:e299-e313. [PMID: 33761762 PMCID: PMC8159856 DOI: 10.1161/atvbaha.121.316066] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
[Figure: see text].
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Affiliation(s)
- Alan Chait
- Department of Medicine, Division of Metabolism, Endocrinology, and Nutrition (A.C., S.W., L.G., D.G., K.E.T., J.T., C.S., K.B.R., C.T., T.V., L.J.D.H.), University of Washington, Seattle
- Diabetes Institute (A.C., S.W., L.G., D.G., K.E.T., T.W., J.T., C.S., K.D.O., K.B.R., C.T., T.V., L.J.D.H.), University of Washington, Seattle
| | - Shari Wang
- Department of Medicine, Division of Metabolism, Endocrinology, and Nutrition (A.C., S.W., L.G., D.G., K.E.T., J.T., C.S., K.B.R., C.T., T.V., L.J.D.H.), University of Washington, Seattle
- Diabetes Institute (A.C., S.W., L.G., D.G., K.E.T., T.W., J.T., C.S., K.D.O., K.B.R., C.T., T.V., L.J.D.H.), University of Washington, Seattle
| | - Leela Goodspeed
- Department of Medicine, Division of Metabolism, Endocrinology, and Nutrition (A.C., S.W., L.G., D.G., K.E.T., J.T., C.S., K.B.R., C.T., T.V., L.J.D.H.), University of Washington, Seattle
- Diabetes Institute (A.C., S.W., L.G., D.G., K.E.T., T.W., J.T., C.S., K.D.O., K.B.R., C.T., T.V., L.J.D.H.), University of Washington, Seattle
| | - Diego Gomes
- Department of Medicine, Division of Metabolism, Endocrinology, and Nutrition (A.C., S.W., L.G., D.G., K.E.T., J.T., C.S., K.B.R., C.T., T.V., L.J.D.H.), University of Washington, Seattle
- Diabetes Institute (A.C., S.W., L.G., D.G., K.E.T., T.W., J.T., C.S., K.D.O., K.B.R., C.T., T.V., L.J.D.H.), University of Washington, Seattle
| | - Katherine E Turk
- Department of Medicine, Division of Metabolism, Endocrinology, and Nutrition (A.C., S.W., L.G., D.G., K.E.T., J.T., C.S., K.B.R., C.T., T.V., L.J.D.H.), University of Washington, Seattle
- Diabetes Institute (A.C., S.W., L.G., D.G., K.E.T., T.W., J.T., C.S., K.D.O., K.B.R., C.T., T.V., L.J.D.H.), University of Washington, Seattle
| | - Tomasz Wietecha
- Diabetes Institute (A.C., S.W., L.G., D.G., K.E.T., T.W., J.T., C.S., K.D.O., K.B.R., C.T., T.V., L.J.D.H.), University of Washington, Seattle
- Department of Medicine, Division of Cardiology (T.W., K.D.O.), University of Washington, Seattle
| | - Jingjing Tang
- Department of Medicine, Division of Metabolism, Endocrinology, and Nutrition (A.C., S.W., L.G., D.G., K.E.T., J.T., C.S., K.B.R., C.T., T.V., L.J.D.H.), University of Washington, Seattle
- Diabetes Institute (A.C., S.W., L.G., D.G., K.E.T., T.W., J.T., C.S., K.D.O., K.B.R., C.T., T.V., L.J.D.H.), University of Washington, Seattle
| | - Carl Storey
- Department of Medicine, Division of Metabolism, Endocrinology, and Nutrition (A.C., S.W., L.G., D.G., K.E.T., J.T., C.S., K.B.R., C.T., T.V., L.J.D.H.), University of Washington, Seattle
- Diabetes Institute (A.C., S.W., L.G., D.G., K.E.T., T.W., J.T., C.S., K.D.O., K.B.R., C.T., T.V., L.J.D.H.), University of Washington, Seattle
| | - Kevin D O'Brien
- Diabetes Institute (A.C., S.W., L.G., D.G., K.E.T., T.W., J.T., C.S., K.D.O., K.B.R., C.T., T.V., L.J.D.H.), University of Washington, Seattle
- Department of Medicine, Division of Cardiology (T.W., K.D.O.), University of Washington, Seattle
| | - Katya B Rubinow
- Department of Medicine, Division of Metabolism, Endocrinology, and Nutrition (A.C., S.W., L.G., D.G., K.E.T., J.T., C.S., K.B.R., C.T., T.V., L.J.D.H.), University of Washington, Seattle
- Diabetes Institute (A.C., S.W., L.G., D.G., K.E.T., T.W., J.T., C.S., K.D.O., K.B.R., C.T., T.V., L.J.D.H.), University of Washington, Seattle
| | - Chongren Tang
- Department of Medicine, Division of Metabolism, Endocrinology, and Nutrition (A.C., S.W., L.G., D.G., K.E.T., J.T., C.S., K.B.R., C.T., T.V., L.J.D.H.), University of Washington, Seattle
- Diabetes Institute (A.C., S.W., L.G., D.G., K.E.T., T.W., J.T., C.S., K.D.O., K.B.R., C.T., T.V., L.J.D.H.), University of Washington, Seattle
| | - Tomas Vaisar
- Department of Medicine, Division of Metabolism, Endocrinology, and Nutrition (A.C., S.W., L.G., D.G., K.E.T., J.T., C.S., K.B.R., C.T., T.V., L.J.D.H.), University of Washington, Seattle
- Diabetes Institute (A.C., S.W., L.G., D.G., K.E.T., T.W., J.T., C.S., K.D.O., K.B.R., C.T., T.V., L.J.D.H.), University of Washington, Seattle
| | - Sina A Gharib
- Division of Pulmonary, Critical Care and Sleep Medicine, Computational Medicine Core, Department of Medicine, Center for Lung Biology (S.A.G.), University of Washington, Seattle
| | - Aldons J Lusis
- Department of Human Genetics, University of California, Los Angeles (A.J.L.)
| | - Laura J Den Hartigh
- Department of Medicine, Division of Metabolism, Endocrinology, and Nutrition (A.C., S.W., L.G., D.G., K.E.T., J.T., C.S., K.B.R., C.T., T.V., L.J.D.H.), University of Washington, Seattle
- Diabetes Institute (A.C., S.W., L.G., D.G., K.E.T., T.W., J.T., C.S., K.D.O., K.B.R., C.T., T.V., L.J.D.H.), University of Washington, Seattle
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12
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Kamiya S, Shimizu K, Okada A, Inoshima Y. Induction of Serum Amyloid A3 in Mouse Mammary Epithelial Cells Stimulated with Lipopolysaccharide and Lipoteichoic Acid. Animals (Basel) 2021; 11:ani11061548. [PMID: 34070499 PMCID: PMC8230092 DOI: 10.3390/ani11061548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Revised: 05/15/2021] [Accepted: 05/23/2021] [Indexed: 12/04/2022] Open
Abstract
Simple Summary Serum amyloid A (SAA) is an acute phase protein present in mammals and birds. Based on the amino acid sequence, SAA has been classified into isoforms SAA1–4 in mice. Previously, it was reported that after the stimulation with bacterial antigens, the expression of the Saa3 mRNA was induced more strongly than that of the Saa1 mRNA in mouse epithelia, including colonic and alveolar epithelial cells, indicating that SAA3 plays a role in the local response. However, the contribution of SAA3 to the local response in mouse mammary epithelium, where mastitis occurs due to bacterial infection, has not been completely determined yet. In this study, to clarify whether mouse SAA3 has a role in the defense against bacterial infection in mouse mammary epithelium, normal murine mammary gland (NMuMG) epithelial cells were stimulated with lipopolysaccharide (LPS) and lipoteichoic acid (LTA). LPS and LTA significantly enhanced mRNA expression level of the Saa3 gene but not that of Saa1. Furthermore, LPS induced SAA3 protein expression more strongly than LTA. Our data indicate that SAA3 expression in mouse mammary epithelial cells was increased by the stimulation with bacterial antigens, suggesting that SAA3 is involved in the defense against bacterial infection in mouse mammary epithelium. Abstract In this study, to establish whether serum amyloid A (SAA) 3 plays a role in the defense against bacterial infection in mouse mammary epithelium, normal murine mammary gland (NMuMG) epithelial cells were stimulated with lipopolysaccharide (LPS) and lipoteichoic acid (LTA). LPS and LTA significantly enhanced mRNA expression level of the Saa3 gene, whereas no significant change was observed in the Saa1 mRNA level. Furthermore, LPS induced SAA3 protein expression more strongly than LTA, whereas neither LPS nor LTA significantly affected SAA1 protein expression. These data indicate that the expression of SAA3 in mouse mammary epithelial cells was increased by the stimulation with bacterial antigens. SAA3 has been reported to stimulate neutrophils in the intestinal epithelium and increase interleukin-22 expression, which induces activation of the innate immune system and production of antibacterial proteins, such as antimicrobial peptides. Therefore, collectively, these data suggest that SAA3 is involved in the defense against bacterial infection in mouse mammary epithelium.
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Affiliation(s)
- Sato Kamiya
- Laboratory of Food and Environmental Hygiene, Cooperative Department of Veterinary Medicine, Faculty of Applied Biological Sciences, Gifu University, Gifu 501-1193, Japan; (S.K.); (K.S.); (A.O.)
| | - Kaori Shimizu
- Laboratory of Food and Environmental Hygiene, Cooperative Department of Veterinary Medicine, Faculty of Applied Biological Sciences, Gifu University, Gifu 501-1193, Japan; (S.K.); (K.S.); (A.O.)
| | - Ayaka Okada
- Laboratory of Food and Environmental Hygiene, Cooperative Department of Veterinary Medicine, Faculty of Applied Biological Sciences, Gifu University, Gifu 501-1193, Japan; (S.K.); (K.S.); (A.O.)
- Education and Research Center for Food Animal Health, Gifu University (GeFAH), Gifu 501-1193, Japan
| | - Yasuo Inoshima
- Laboratory of Food and Environmental Hygiene, Cooperative Department of Veterinary Medicine, Faculty of Applied Biological Sciences, Gifu University, Gifu 501-1193, Japan; (S.K.); (K.S.); (A.O.)
- Education and Research Center for Food Animal Health, Gifu University (GeFAH), Gifu 501-1193, Japan
- Joint Graduate School of Veterinary Sciences, Gifu University, Gifu 501-1193, Japan
- The United Graduate School of Veterinary Sciences, Gifu University, Gifu 501-1193, Japan
- Correspondence: ; Tel.: +81-58-293-2863
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13
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Peng H, Guo Q, Su T, Xiao Y, Li CJ, Huang Y, Luo XH. Identification of SCARA3 with potential roles in metabolic disorders. Aging (Albany NY) 2020; 13:2149-2167. [PMID: 33318306 PMCID: PMC7880357 DOI: 10.18632/aging.202228] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Accepted: 10/22/2020] [Indexed: 04/11/2023]
Abstract
Obesity is characterized by the expansion of adipose tissue which is partially modulated by adipogenesis. In the present study, we identified five differentially expressed genes by incorporating two adipogenesis-related datasets from the GEO database and their correlation with adipogenic markers. However, the role of scavenger receptor class A member 3 (SCARA3) in obesity-related disorders has been rarely reported. We found that Scara3 expression in old adipose tissue-derived mesenchymal stem cells (Ad-MSCs) was lower than it in young Ad-MSCs. Obese mice caused by deletion of the leptin receptor gene (db/db) or by a high-fat diet both showed reduced Scara3 expression in inguinal white adipose tissue. Moreover, hypermethylation of SCARA3 was observed in patients with type 2 diabetes and atherosclerosis. Data from the CTD database indicated that SCARA3 is a potential target for metabolic diseases. Mechanistically, JUN was predicted as a transcriptional factor of SCARA3 in different databases which is consistent with our further bioinformatics analysis. Collectively, our study suggested that SCARA3 is potentially associated with age-related metabolic dysfunction, which provided new insights into the pathogenesis and treatment of obesity as well as other obesity-associated metabolic complications.
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Affiliation(s)
- Hui Peng
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, China
| | - Qi Guo
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, China
| | - Tian Su
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, China
| | - Ye Xiao
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, China
| | - Chang-Jun Li
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, China
| | - Yan Huang
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, China
| | - Xiang-Hang Luo
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, China
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14
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Han CY, Kang I, Omer M, Wang S, Wietecha T, Wight TN, Chait A. Serum amyloid A-containing HDL binds adipocyte-derived versican and macrophage-derived biglycan, reducing its antiinflammatory properties. JCI Insight 2020; 5:142635. [PMID: 32970631 PMCID: PMC7605543 DOI: 10.1172/jci.insight.142635] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Accepted: 09/16/2020] [Indexed: 12/25/2022] Open
Abstract
The ability of HDL to inhibit inflammation in adipocytes and adipose tissue is reduced when HDL contains serum amyloid A (SAA) that is trapped by proteoglycans at the adipocyte surface. Because we recently found that the major extracellular matrix proteoglycan produced by hypertrophic adipocytes is versican, whereas activated adipose tissue macrophages produce mainly biglycan, we further investigated the role of proteoglycans in determining the antiinflammatory properties of HDL. The distributions of versican, biglycan, apolipoprotein A1 (the major apolipoprotein of HDL), and SAA were similar in adipose tissue from obese mice and obese human subjects. Colocalization of SAA-enriched HDL with versican and biglycan at the cell surface of adipocyte and peritoneal macrophages, respectively, was blocked by silencing these proteoglycans, which also restored the antiinflammatory property of SAA-enriched HDL despite the presence of SAA. Similar to adipocytes, normal HDL exerted its antiinflammatory function in macrophages by reducing lipid rafts, reactive oxygen species generation, and translocation of Toll-like receptor 4 and NADPH oxidase 2 into lipid rafts, effects that were not observed with SAA-enriched HDL. These findings imply that SAA present in HDL can be trapped by adipocyte-derived versican and macrophage-derived biglycan, thereby blunting HDL’s antiinflammatory properties. Versican in adiopcytes and biglycan in macrophages trap serum amyloid A-containing HDL, thereby blocking HDL’s anti-inflammatory properties.
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Affiliation(s)
- Chang Yeop Han
- Division of Metabolism, Endocrinology, and Nutrition, Department of Medicine, University of Washington, Seattle, Washington, USA
| | - Inkyung Kang
- Matrix Biology Program, Benaroya Research Institute, Seattle, Washington, USA
| | - Mohamed Omer
- Division of Metabolism, Endocrinology, and Nutrition, Department of Medicine, University of Washington, Seattle, Washington, USA
| | - Shari Wang
- Division of Metabolism, Endocrinology, and Nutrition, Department of Medicine, University of Washington, Seattle, Washington, USA
| | - Tomasz Wietecha
- Division of Cardiology, Department of Medicine, University of Washington, Seattle, Washington, USA
| | - Thomas N Wight
- Matrix Biology Program, Benaroya Research Institute, Seattle, Washington, USA
| | - Alan Chait
- Division of Metabolism, Endocrinology, and Nutrition, Department of Medicine, University of Washington, Seattle, Washington, USA
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Biological Characterization of Commercial Recombinantly Expressed Immunomodulating Proteins Contaminated with Bacterial Products in the Year 2020: The SAA3 Case. Mediators Inflamm 2020; 2020:6087109. [PMID: 32694927 PMCID: PMC7362292 DOI: 10.1155/2020/6087109] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Revised: 05/19/2020] [Accepted: 06/03/2020] [Indexed: 01/20/2023] Open
Abstract
The serum amyloid A (SAA) gene family is highly conserved and encodes acute phase proteins that are upregulated in response to inflammatory triggers. Over the years, a considerable amount of literature has been published attributing a wide range of biological effects to SAAs such as leukocyte recruitment, cytokine and chemokine expression and induction of matrix metalloproteinases. Furthermore, SAAs have also been linked to protumorigenic, proatherogenic and anti-inflammatory effects. Here, we investigated the biological effects conveyed by murine SAA3 (mu rSAA3) recombinantly expressed in Escherichia coli. We observed the upregulation of a number of chemokines including CCL2, CCL3, CXCL1, CXCL2, CXCL6 or CXCL8 following stimulation of monocytic, fibroblastoid and peritoneal cells with mu rSAA3. Furthermore, this SAA variant displayed potent in vivo recruitment of neutrophils through the activation of TLR4. However, a major problem associated with proteins derived from recombinant expression in bacteria is potential contamination with various bacterial products, such as lipopolysaccharide, lipoproteins and formylated peptides. This is of particular relevance in the case of SAA as there currently exists a discrepancy in biological activity between SAA derived from recombinant expression and that of an endogenous source, i.e. inflammatory plasma. Therefore, we subjected commercial recombinant mu rSAA3 to purification to homogeneity via reversed-phase high-performance liquid chromatography (RP-HPLC) and re-assessed its biological potential. RP-HPLC-purified mu rSAA3 did not induce chemokines and lacked in vivo neutrophil chemotactic activity, but retained the capacity to synergize with CXCL8 in the activation of neutrophils. In conclusion, experimental results obtained when using proteins recombinantly expressed in bacteria should always be interpreted with care.
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Chait A, den Hartigh LJ, Wang S, Goodspeed L, Babenko I, Altemeier WA, Vaisar T. Presence of serum amyloid A3 in mouse plasma is dependent on the nature and extent of the inflammatory stimulus. Sci Rep 2020; 10:10397. [PMID: 32587356 PMCID: PMC7316782 DOI: 10.1038/s41598-020-66898-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Accepted: 05/26/2020] [Indexed: 11/09/2022] Open
Abstract
Serum amyloid A3 (Saa3) derives mainly from extrahepatic tissue and is not detected in plasma from moderately inflamed obese mice. In contrast, it is present in plasma from mice acutely inflamed by injection of high dose of lipopolysaccharide (LPS). To reconcile these differences, we evaluated whether different acute inflammatory stimuli could affect the presence of Saa3 in plasma. Saa3 appeared dose dependently in plasma after LPS injection. In contrast, only very low levels were detected after sterile inflammation with silver nitrate despite levels of Saa1 and Saa2 being comparable to high dose LPS. Saa3 was not detected in plasma following casein administration. Although most Saa3 was found in HDL, a small amount was not lipoprotein associated. Gene expression and proteomic analysis of liver and adipose tissue suggested that a major source of Saa3 in plasma after injection of LPS was adipose tissue rather than liver. We conclude that Saa3 only appears in plasma after induction of acute inflammation by some but not all inflammatory stimuli. These findings are consistent with the observation that Saa3 is not detectable in plasma in more moderate chronic inflammatory states such as obesity.
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Affiliation(s)
- Alan Chait
- Divisions of Metabolism, Endocrinology and Nutrition, University of Washington, Seattle, WA, 98109, USA.
| | - Laura J den Hartigh
- Divisions of Metabolism, Endocrinology and Nutrition, University of Washington, Seattle, WA, 98109, USA
| | - Shari Wang
- Divisions of Metabolism, Endocrinology and Nutrition, University of Washington, Seattle, WA, 98109, USA
| | - Leela Goodspeed
- Divisions of Metabolism, Endocrinology and Nutrition, University of Washington, Seattle, WA, 98109, USA
| | - Ilona Babenko
- Divisions of Metabolism, Endocrinology and Nutrition, University of Washington, Seattle, WA, 98109, USA
| | - William A Altemeier
- Pulmonary, Critical Care and Sleep Medicine, University of Washington, Seattle, WA, 98109, USA
| | - Tomas Vaisar
- Divisions of Metabolism, Endocrinology and Nutrition, University of Washington, Seattle, WA, 98109, USA
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17
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Association between serum amyloid A levels and coronary heart disease: a systematic review and meta-analysis of 26 studies. Inflamm Res 2020; 69:331-345. [DOI: 10.1007/s00011-020-01325-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2019] [Revised: 01/19/2020] [Accepted: 02/11/2020] [Indexed: 12/20/2022] Open
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18
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Funcke JB, Scherer PE. Beyond adiponectin and leptin: adipose tissue-derived mediators of inter-organ communication. J Lipid Res 2019; 60:1648-1684. [PMID: 31209153 PMCID: PMC6795086 DOI: 10.1194/jlr.r094060] [Citation(s) in RCA: 175] [Impact Index Per Article: 35.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Revised: 06/17/2019] [Indexed: 01/10/2023] Open
Abstract
The breakthrough discoveries of leptin and adiponectin more than two decades ago led to a widespread recognition of adipose tissue as an endocrine organ. Many more adipose tissue-secreted signaling mediators (adipokines) have been identified since then, and much has been learned about how adipose tissue communicates with other organs of the body to maintain systemic homeostasis. Beyond proteins, additional factors, such as lipids, metabolites, noncoding RNAs, and extracellular vesicles (EVs), released by adipose tissue participate in this process. Here, we review the diverse signaling mediators and mechanisms adipose tissue utilizes to relay information to other organs. We discuss recently identified adipokines (proteins, lipids, and metabolites) and briefly outline the contributions of noncoding RNAs and EVs to the ever-increasing complexities of adipose tissue inter-organ communication. We conclude by reflecting on central aspects of adipokine biology, namely, the contribution of distinct adipose tissue depots and cell types to adipokine secretion, the phenomenon of adipokine resistance, and the capacity of adipose tissue to act both as a source and sink of signaling mediators.
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Affiliation(s)
- Jan-Bernd Funcke
- Touchstone Diabetes Center, University of Texas Southwestern Medical Center, Dallas, TX
| | - Philipp E Scherer
- Touchstone Diabetes Center, University of Texas Southwestern Medical Center, Dallas, TX
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19
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Chen X, Zhuo S, Zhu T, Yao P, Yang M, Mei H, Li N, Ma F, Wang JM, Chen S, Ye RD, Li Y, Le Y. Fpr2 Deficiency Alleviates Diet-Induced Insulin Resistance Through Reducing Body Weight Gain and Inhibiting Inflammation Mediated by Macrophage Chemotaxis and M1 Polarization. Diabetes 2019; 68:1130-1142. [PMID: 30862681 PMCID: PMC6905484 DOI: 10.2337/db18-0469] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Accepted: 02/17/2019] [Indexed: 12/15/2022]
Abstract
Obesity and related inflammation are critical for the pathogenesis of insulin resistance, but the underlying mechanisms are not fully understood. Formyl peptide receptor 2 (FPR2) plays important roles in host immune responses and inflammation-related diseases. We found that Fpr2 expression was elevated in the white adipose tissue of high-fat diet (HFD)-induced obese mice and db/db mice. The systemic deletion of Fpr2 alleviated HFD-induced obesity, insulin resistance, hyperglycemia, hyperlipidemia, and hepatic steatosis. Furthermore, Fpr2 deletion in HFD-fed mice elevated body temperature, reduced fat mass, and inhibited inflammation by reducing macrophage infiltration and M1 polarization in metabolic tissues. Bone marrow transplantations between wild-type and Fpr2-/- mice and myeloid-specific Fpr2 deletion demonstrated that Fpr2-expressing myeloid cells exacerbated HFD-induced obesity, insulin resistance, glucose/lipid metabolic disturbances, and inflammation. Mechanistic studies revealed that Fpr2 deletion in HFD-fed mice enhanced energy expenditure probably through increasing thermogenesis in skeletal muscle; serum amyloid A3 and other factors secreted by adipocytes induced macrophage chemotaxis via Fpr2; and Fpr2 deletion suppressed macrophage chemotaxis and lipopolysaccharide-, palmitate-, and interferon-γ-induced macrophage M1 polarization through blocking their signals. Altogether, our studies demonstrate that myeloid Fpr2 plays critical roles in obesity and related metabolic disorders via regulating muscle energy expenditure, macrophage chemotaxis, and M1 polarization.
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Affiliation(s)
- Xiaofang Chen
- CAS Key Laboratory of Nutrition, Metabolism and Food Safety, Shanghai Institute of Nutrition and Health, Shanghai Institutes for Biological Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Shu Zhuo
- CAS Key Laboratory of Nutrition, Metabolism and Food Safety, Shanghai Institute of Nutrition and Health, Shanghai Institutes for Biological Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Tengfei Zhu
- CAS Key Laboratory of Nutrition, Metabolism and Food Safety, Shanghai Institute of Nutrition and Health, Shanghai Institutes for Biological Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Pengle Yao
- CAS Key Laboratory of Nutrition, Metabolism and Food Safety, Shanghai Institute of Nutrition and Health, Shanghai Institutes for Biological Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Mengmei Yang
- CAS Key Laboratory of Nutrition, Metabolism and Food Safety, Shanghai Institute of Nutrition and Health, Shanghai Institutes for Biological Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Hong Mei
- CAS Key Laboratory of Nutrition, Metabolism and Food Safety, Shanghai Institute of Nutrition and Health, Shanghai Institutes for Biological Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Na Li
- CAS Key Laboratory of Nutrition, Metabolism and Food Safety, Shanghai Institute of Nutrition and Health, Shanghai Institutes for Biological Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Fengguang Ma
- CAS Key Laboratory of Nutrition, Metabolism and Food Safety, Shanghai Institute of Nutrition and Health, Shanghai Institutes for Biological Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Ji Ming Wang
- Cancer and Inflammation Program, Center for Cancer Research, National Cancer Institute at Frederick, Frederick, MD
| | - Shiting Chen
- CAS Key Laboratory of Nutrition, Metabolism and Food Safety, Shanghai Institute of Nutrition and Health, Shanghai Institutes for Biological Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Richard D Ye
- Institute of Chinese Medical Sciences, University of Macau, Macau Special Administrative Region, China
| | - Yu Li
- CAS Key Laboratory of Nutrition, Metabolism and Food Safety, Shanghai Institute of Nutrition and Health, Shanghai Institutes for Biological Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Yingying Le
- CAS Key Laboratory of Nutrition, Metabolism and Food Safety, Shanghai Institute of Nutrition and Health, Shanghai Institutes for Biological Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
- Key Laboratory of Food Safety Risk Assessment, Ministry of Health, Beijing, China
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Dieter BP, Meek RL, Anderberg RJ, Cooney SK, Bergin JL, Zhang H, Nair V, Kretzler M, Brosius FC, Tuttle KR. Serum amyloid A and Janus kinase 2 in a mouse model of diabetic kidney disease. PLoS One 2019; 14:e0211555. [PMID: 30763329 PMCID: PMC6375550 DOI: 10.1371/journal.pone.0211555] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2018] [Accepted: 01/16/2019] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND Serum amyloid A (SAA), a potent inflammatory mediator, and Janus kinase 2 (JAK2), an intracellular signaling kinase, are increased by diabetes. The aims were to elucidate: 1) a JAK2-mediated pathway for increased SAA in the kidneys of diabetic mice; 2) a JAK2-SAA pathway for inflammation in podocytes. METHODS Akita diabetic mice (129S6) with podocyte JAK2 overexpression and angiotensin II infusion (4 weeks) were given a JAK1,2 inhibitor (LY03103801, 3 mg/kg/day orally for the last two weeks). Kidneys were immunostained for SAA isoform 3 (SAA3). SAA3 knockout and control mouse podocytes were exposed to advanced glycation end products (AGE) or exogenous SAA with JAK2 inhibition (Tyrphostin AG 490, 50μM). JAK2 activity (phosphorylation, Western blot, 1 hour) and mRNA for SAA3 and associated inflammatory genes (Cxcl5, Ccl2, and Ccl5) were measured by RT-PCR (20 hours). RESULTS SAA3 protein was present throughout the diabetic kidney, and podocyte JAK2 overexpression increased tubulointerstitial SAA3 compared to wild type diabetic controls, 43% versus 14% (p = 0.007); JAK1,2 inhibition attenuated the increase in SAA3 to 15% (p = 0.003). Urine albumin-to-creatinine ratio (r = 0.49, p = 0.03), mesangial index (r = 0.64, p = 0.001), and glomerulosclerosis score (r = 0.51, p = 0.02) were associated with SAA3 immunostaining scores across mouse groups. Exposing podocytes to AGE or exogenous SAA increased JAK2 activity within one hour and mRNA for associated inflammatory genes after 20 hours. JAK2 inhibition reduced SAA3 mRNA expression in podocytes exposed to AGE or SAA. SAA3 knockout podocytes had >85% lower AGE-induced inflammatory genes. CONCLUSION JAK1,2 inhibition reduced SAA and histological features of DKD in podocyte JAK2-overexpressing mice. In podocytes exposed to a diabetes-like condition, JAK2 inhibition reduced expression of SAA, while SAA knockout blocked expression of associated pro-inflammatory mediators. SAA may promote JAK2-dependent inflammation in the diabetic kidney.
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Affiliation(s)
- Brad P. Dieter
- Providence Medical Research Center, Providence Health Care, Spokane, Washington, United States of America
| | - Rick L. Meek
- Providence Medical Research Center, Providence Health Care, Spokane, Washington, United States of America
| | - Robert J. Anderberg
- Providence Medical Research Center, Providence Health Care, Spokane, Washington, United States of America
| | - Sheryl K. Cooney
- Providence Medical Research Center, Providence Health Care, Spokane, Washington, United States of America
| | - Jen L. Bergin
- Providence Medical Research Center, Providence Health Care, Spokane, Washington, United States of America
| | - Hongyu Zhang
- Internal Medicine, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Viji Nair
- Internal Medicine, University of Michigan, Ann Arbor, Michigan, United States of America
- Molecular and Integrative Physiology, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Matthias Kretzler
- Internal Medicine, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Frank C. Brosius
- Internal Medicine, University of Michigan, Ann Arbor, Michigan, United States of America
- Molecular and Integrative Physiology, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Katherine R. Tuttle
- Providence Medical Research Center, Providence Health Care, Spokane, Washington, United States of America
- Institute of Translational Health Sciences, Kidney Research Institute, Nephrology Division University of Washington, Seattle, Washington, United States of America
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21
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Ignacio RMC, Gibbs CR, Kim S, Lee ES, Adunyah SE, Son DS. Serum amyloid A predisposes inflammatory tumor microenvironment in triple negative breast cancer. Oncotarget 2019; 10:511-526. [PMID: 30728901 PMCID: PMC6355188 DOI: 10.18632/oncotarget.26566] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Accepted: 12/29/2018] [Indexed: 12/20/2022] Open
Abstract
Acute-phase proteins (APPs) are associated with a variety of disorders such as infection, inflammatory diseases, and cancers. The signature profile of APPs in breast cancer (BC) is poorly understood. Here, we identified serum amyloid A (SAA) for proinflammatory predisposition in BC through the signature profiles of APPs, interleukin (IL) and tumor necrosis factor (TNF) superfamily using publicly available datasets of tumor samples and cell lines. Triple-negative breast cancer (TNBC) subtype highly expressed SAA1/2 compared to HER2, luminal A (LA) and luminal B (LB) subtypes. IL1A, IL1B, IL8/CXCL8, IL32 and IL27RA in IL superfamily and CD70, TNFSF9 and TNFRSF21 in TNF superfamily were highly expressed in TNBC compared to other subtypes. SAA is restrictedly regulated by nuclear factor (NF)-κB and IL-1β, an NF-κB activator highly expressed in TNBC, increased the promoter activity of SAA1 in human TNBC MDA-MB231 cells. Interestingly, two κB-sites contained in SAA1 promoter were involved, and the proximal region (-96/-87) was more critical than the distal site (-288/-279) in regulating IL-1β-induced SAA1. Among the SAA receptors, TLR1 and TLR2 were highly expressed in TNBC. Cu-CPT22, TLR1/2 antagonist, abrogated IL-1β-induced SAA1 promoter activity. In addition, SAA1 induced IL8/CXCL8 promoter activity, which was partially reduced by Cu-CPT22. Notably, SAA1/2, TLR2 and IL8/CXCL8 were associated with a poor overall survival in mesenchymal-like TNBC. Taken together, IL-1-induced SAA via NF-κB-mediated signaling could potentiate an inflammatory burden, leading to cancer progression and high mortality in TNBC patients.
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Affiliation(s)
- Rosa Mistica C Ignacio
- Department of Biochemistry, Cancer Biology, Neuroscience and Pharmacology, Meharry Medical College, Nashville, TN, USA
| | - Carla R Gibbs
- Department of Biochemistry, Cancer Biology, Neuroscience and Pharmacology, Meharry Medical College, Nashville, TN, USA
| | - Soohyun Kim
- Department of Veterinary Sciences, College of Veterinary Medicine, Kon-Kuk University, Seoul, Republic of Korea
| | - Eun-Sook Lee
- Department of Pharmaceutical Sciences, College of Pharmacy, Florida A&M University, Tallahassee, FL, USA
| | - Samuel E Adunyah
- Department of Biochemistry, Cancer Biology, Neuroscience and Pharmacology, Meharry Medical College, Nashville, TN, USA
| | - Deok-Soo Son
- Department of Biochemistry, Cancer Biology, Neuroscience and Pharmacology, Meharry Medical College, Nashville, TN, USA
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22
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Zhou J, Sheng J, Fan Y, Zhu X, Tao Q, He Y, Wang S. Association between serum amyloid A levels and cancers: a systematic review and meta-analysis. Postgrad Med J 2018; 94:499-507. [PMID: 30341230 DOI: 10.1136/postgradmedj-2018-136004] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Revised: 09/02/2018] [Accepted: 09/08/2018] [Indexed: 01/02/2023]
Abstract
OBJECTIVE Increased serum amyloid A (SAA) levels have been investigated in various human malignancies, but a consistent perspective has not been established to date. This study systematically reviewed the association between SAA levels and cancers. METHODS Cochrane Library, PubMed and Embase were carefully searched for available studies. The following keywords were used in database searches: 'serum amyloid A', 'SAA', 'cancer', 'tumour', 'carcinoma', 'nubble', 'knurl' and 'lump'. Pooled standard mean differences (SMDs) with corresponding 95% CIs were calculated using random-effects model analysis. RESULTS Twenty studies, which contained 3682 cancer cases and 2424 healthy controls, were identified in this systematic review and meta-analysis. Our study suggested that the average SAA concentrations in the case groups were significantly higher than those in control groups (SMD 0.77, 95% CI 0.55 to 1.00, p<0.001). Subgroup analysis revealed that continent, age and cancer location were associated with SAA level differences between case groups and control groups. Sensitivity analyses showed the robustness and credibility of our results. In addition, we further stratified analyses for cancer stages and found that the concentrations of SAA increased gradually with the aggravation of cancer stages. CONCLUSION High circulating SAA levels were markedly associated with the developing risks of cancer, especially for participants from Asia, Oceania and Europe, or subject age more than 50, or locations in oesophageal squamous cell, ovarian, breast, lung, renal and gastric cancers. In addition, our study found that the concentrations of SAA increased with the severity of cancer stages.
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Affiliation(s)
- Jielin Zhou
- Department of Nutrition and Food Hygiene, School of Public Health, Anhui Medical University, Hefei, China
| | - Jie Sheng
- Anhui Provincial Laboratory of Population Health and Eugenics, School of Public Health, Anhui Medical University, Hefei, China
| | - Yong Fan
- Department of Nutrition and Food Hygiene, School of Public Health, Anhui Medical University, Hefei, China
| | - Xingmeng Zhu
- Department of Nutrition and Food Hygiene, School of Public Health, Anhui Medical University, Hefei, China
| | - Qi Tao
- Department of Nutrition and Food Hygiene, School of Public Health, Anhui Medical University, Hefei, China
| | - Yue He
- Department of Nutrition and Food Hygiene, School of Public Health, Anhui Medical University, Hefei, China
| | - Sufang Wang
- Department of Nutrition and Food Hygiene, School of Public Health, Anhui Medical University, Hefei, China
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23
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Choudhary S, Santone E, Yee SP, Lorenzo J, Adams DJ, Goetjen A, McCarthy MB, Mazzocca AD, Pilbeam C. Continuous PTH in Male Mice Causes Bone Loss Because It Induces Serum Amyloid A. Endocrinology 2018; 159:2759-2776. [PMID: 29757436 PMCID: PMC6692876 DOI: 10.1210/en.2018-00265] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Accepted: 05/05/2018] [Indexed: 12/12/2022]
Abstract
Increased bone resorption is considered to explain why intermittent PTH is anabolic for bone but continuous PTH is catabolic. However, when cyclooxygenase-2 (COX2) is absent in mice, continuous PTH becomes anabolic without decreased resorption. In murine bone marrow stromal cells (BMSCs), serum amyloid A (SAA)3, induced in the hematopoietic lineage by the combination of COX2-produced prostaglandin and receptor activator of nuclear factor κB ligand (RANKL), suppresses PTH-stimulated osteoblast differentiation. To determine whether SAA3 inhibits the anabolic effects of PTH in vivo, wild-type (WT) and SAA3 knockout (KO) mice were infused with PTH. In WT mice, continuous PTH induced SAA3 and was catabolic for bone. In KO mice, PTH was anabolic, increasing trabecular bone, serum markers of bone formation, and osteogenic gene expression. In contrast, PTH increased all measurements associated with bone resorption, as well as COX2 gene expression, similarly in KO and WT mice. SAA1 and SAA2 in humans are likely to have analogous functions to SAA3 in mice. RANKL induced both SAA1 and SAA2 in human bone marrow macrophages in a COX2-dependent manner. PTH stimulated osteogenesis in human BMSCs only when COX2 or RANKL was inhibited. Addition of recombinant SAA1 or SAA2 blocked PTH-stimulated osteogenesis. In summary, SAA3 suppresses the bone formation responses but not the bone resorption responses to PTH in mice, and in the absence of SAA3, continuous PTH is anabolic. In vitro studies in human bone marrow suggest that SAA may be a target for enhancing the therapeutic effects of PTH in treating osteoporosis.
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Affiliation(s)
- Shilpa Choudhary
- Musculoskeletal Institute, UConn Health, Farmington, Connecticut
- Department of Medicine, UConn Health, Farmington, Connecticut
| | | | - Sui-Pok Yee
- Department of Cell Biology, UConn Health, Farmington, Connecticut
- Center for Mouse Genome Modification, UConn Health, Farmington, Connecticut
| | - Joseph Lorenzo
- Musculoskeletal Institute, UConn Health, Farmington, Connecticut
- Department of Medicine, UConn Health, Farmington, Connecticut
| | - Douglas J Adams
- Musculoskeletal Institute, UConn Health, Farmington, Connecticut
| | | | | | | | - Carol Pilbeam
- Musculoskeletal Institute, UConn Health, Farmington, Connecticut
- Department of Medicine, UConn Health, Farmington, Connecticut
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24
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Ather JL, Poynter ME. Serum amyloid A3 is required for normal weight and immunometabolic function in mice. PLoS One 2018; 13:e0192352. [PMID: 29390039 PMCID: PMC5794179 DOI: 10.1371/journal.pone.0192352] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Accepted: 01/22/2018] [Indexed: 02/06/2023] Open
Abstract
Serum amyloid A (SAA) is an apolipoprotein that is robustly upregulated in numerous inflammatory diseases and has been implicated as a candidate pro-inflammatory mediator. However, studies comparing endogenous SAAs and recombinant forms of the acute phase protein have generated conflicting data on the function of SAA in immunity. We generated SAA3 knockout mice to evaluate the contribution of SAA3 to immune-mediated disease, and found that mice lacking SAA3 develop adult-onset obesity and metabolic dysfunction along with defects in innate immune development. Mice that lack SAA3 gain more weight, exhibit increased visceral adipose deposition, and develop hepatic steatosis compared to wild-type littermates. Leukocytes from the adipose tissue of SAA3-/- mice express a pro-inflammatory phenotype, and bone marrow derived dendritic cells from mice lacking SAA3 secrete increased levels of IL-1β, IL-6, IL-23, and TNFα in response to LPS compared to cells from wild-type mice. Finally, BMDC lacking SAA3 demonstrate an impaired endotoxin tolerance response and inhibited responses to retinoic acid. Our findings indicate that endogenous SAA3 modulates metabolic and immune homeostasis.
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Affiliation(s)
- Jennifer L. Ather
- Vermont Lung Center, Division of Pulmonary Disease and Critical Care, Department of Medicine, University of Vermont, Burlington, VT, United States of America
| | - Matthew E. Poynter
- Vermont Lung Center, Division of Pulmonary Disease and Critical Care, Department of Medicine, University of Vermont, Burlington, VT, United States of America
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25
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Huan B, Liu K, Li Y, Wei J, Shao D, Shi Y, Qiu Y, Li B, Ma Z. Porcine serum amyloid A3 is expressed in extrahepatic tissues and facilitates viral replication during porcine respiratory and reproductive syndrome virus infection. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2018; 79:51-58. [PMID: 29056547 DOI: 10.1016/j.dci.2017.10.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Revised: 10/17/2017] [Accepted: 10/17/2017] [Indexed: 06/07/2023]
Abstract
Serum amyloid A (SAA) is an acute phase protein that is expressed rapidly in response to infection and inflammation in vertebrates. Here, we detected the expression of porcine SAA3, an isoform of porcine SAA, during porcine respiratory and reproductive syndrome virus (PRRSV) infection, which is a major threat to the pig industry. In response to PRRSV infection, porcine SAA3 expression was upregulated significantly in porcine pulmonary alveolar macrophages and in extrahepatic tissues, including the lungs and inguinal, mandibular, and hilar lymph nodes, which were affected mainly by PRRSV infection, demonstrating that porcine SAA3 is a tissue-derived isoform that is induced in extrahepatic tissues during the acute phase response. Overexpression of porcine SAA3 increased PRRSV titers in cultured cells, and the exogenous administration of porcine SAA3 facilitated PRRSV adsorption to cells, suggesting that porcine SAA3 assists PRRSV replication. Our data provide insights into the role of porcine SAA3 during PRRSV infection.
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Affiliation(s)
- Beili Huan
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Science, No. 518, Ziyue Road, Shanghai, 200241, PR China
| | - Ke Liu
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Science, No. 518, Ziyue Road, Shanghai, 200241, PR China
| | - Yuming Li
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Science, No. 518, Ziyue Road, Shanghai, 200241, PR China
| | - Jianchao Wei
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Science, No. 518, Ziyue Road, Shanghai, 200241, PR China
| | - Donghua Shao
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Science, No. 518, Ziyue Road, Shanghai, 200241, PR China
| | - Yuanyuan Shi
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Science, No. 518, Ziyue Road, Shanghai, 200241, PR China
| | - Yafeng Qiu
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Science, No. 518, Ziyue Road, Shanghai, 200241, PR China
| | - Beibei Li
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Science, No. 518, Ziyue Road, Shanghai, 200241, PR China; Key Laboratory for Veterinary Chemical Drugs and Pharmaceutics, Ministry of Agriculture of China, No. 518, Ziyue Road, Shanghai, 200241, PR China.
| | - Zhiyong Ma
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Science, No. 518, Ziyue Road, Shanghai, 200241, PR China.
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26
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Tannock LR, De Beer MC, Ji A, Shridas P, Noffsinger VP, den Hartigh L, Chait A, De Beer FC, Webb NR. Serum amyloid A3 is a high density lipoprotein-associated acute-phase protein. J Lipid Res 2017; 59:339-347. [PMID: 29247043 DOI: 10.1194/jlr.m080887] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Revised: 11/22/2017] [Indexed: 12/20/2022] Open
Abstract
Serum amyloid A (SAA) is a family of acute-phase reactants. Plasma levels of human SAA1/SAA2 (mouse SAA1.1/2.1) can increase ≥1,000-fold during an acute-phase response. Mice, but not humans, express a third relatively understudied SAA isoform, SAA3. We investigated whether mouse SAA3 is an HDL-associated acute-phase SAA. Quantitative RT-PCR with isoform-specific primers indicated that SAA3 and SAA1.1/2.1 are induced similarly in livers (∼2,500-fold vs. ∼6,000-fold, respectively) and fat (∼400-fold vs. ∼100-fold, respectively) of lipopolysaccharide (LPS)-injected mice. In situ hybridization demonstrated that all three SAAs are produced by hepatocytes. All three SAA isoforms were detected in plasma of LPS-injected mice, although SAA3 levels were ∼20% of SAA1.1/2.1 levels. Fast protein LC analyses indicated that virtually all of SAA1.1/2.1 eluted with HDL, whereas ∼15% of SAA3 was lipid poor/free. After density gradient ultracentrifugation, isoelectric focusing demonstrated that ∼100% of plasma SAA1.1 was recovered in HDL compared with only ∼50% of SAA2.1 and ∼10% of SAA3. Thus, SAA3 appears to be more loosely associated with HDL, resulting in lipid-poor/free SAA3. We conclude that SAA3 is a major hepatic acute-phase SAA in mice that may produce systemic effects during inflammation.
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Affiliation(s)
- Lisa R Tannock
- Departments of Internal Medicine, University of Kentucky, Lexington, KY.,Saha Cardiovascular Research Center, University of Kentucky, Lexington, KY.,Barnstable Brown Diabetes Center, University of Kentucky, Lexington, KY.,Veterans Affairs Lexington, University of Kentucky, Lexington, KY
| | - Maria C De Beer
- Saha Cardiovascular Research Center, University of Kentucky, Lexington, KY.,Barnstable Brown Diabetes Center, University of Kentucky, Lexington, KY.,Departments of Physiology, University of Kentucky, Lexington, KY
| | - Ailing Ji
- Departments of Internal Medicine, University of Kentucky, Lexington, KY.,Saha Cardiovascular Research Center, University of Kentucky, Lexington, KY
| | - Preetha Shridas
- Departments of Internal Medicine, University of Kentucky, Lexington, KY.,Saha Cardiovascular Research Center, University of Kentucky, Lexington, KY.,Barnstable Brown Diabetes Center, University of Kentucky, Lexington, KY
| | - Victoria P Noffsinger
- Departments of Internal Medicine, University of Kentucky, Lexington, KY.,Saha Cardiovascular Research Center, University of Kentucky, Lexington, KY
| | - Laura den Hartigh
- Department of Medicine University of Washington, Seattle, WA.,University of Washington Diabetes Institute, University of Washington, Seattle, WA
| | - Alan Chait
- Department of Medicine University of Washington, Seattle, WA.,University of Washington Diabetes Institute, University of Washington, Seattle, WA
| | - Frederick C De Beer
- Departments of Internal Medicine, University of Kentucky, Lexington, KY.,Saha Cardiovascular Research Center, University of Kentucky, Lexington, KY.,Barnstable Brown Diabetes Center, University of Kentucky, Lexington, KY
| | - Nancy R Webb
- Saha Cardiovascular Research Center, University of Kentucky, Lexington, KY .,Barnstable Brown Diabetes Center, University of Kentucky, Lexington, KY.,Veterans Affairs Lexington, University of Kentucky, Lexington, KY.,Departments of Pharmacology and Nutritional Sciences, University of Kentucky, Lexington, KY
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27
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Tashiro M, Iwata A, Yamauchi M, Shimizu K, Okada A, Ishiguro N, Inoshima Y. The N-terminal region of serum amyloid A3 protein activates NF-κB and up-regulates MUC2 mucin mRNA expression in mouse colonic epithelial cells. PLoS One 2017; 12:e0181796. [PMID: 28738073 PMCID: PMC5524290 DOI: 10.1371/journal.pone.0181796] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2017] [Accepted: 07/09/2017] [Indexed: 01/01/2023] Open
Abstract
Serum amyloid A (SAA) is the major acute-phase protein and a precursor of amyloid A (AA) in AA amyloidosis in humans and animals. SAA isoforms have been identified in a wide variety of animals, such as SAA1, SAA2, SAA3, and SAA4 in mouse. Although the biological functions of SAA isoforms are not completely understood, recent studies have suggested that SAA3 plays a role in host defense. Expression of SAA3 is increased on the mouse colon surface in the presence of microbiota in vivo, and it increases mRNA expression of mucin 2 (MUC2) in murine colonic epithelial cells in vitro, which constitutes a protective mucus barrier in the intestinal tract. In this study, to identify responsible regions in SAA3 for MUC2 expression, recombinant murine SAA1 (rSAA1), rSAA3, and rSAA1/3, a chimera protein constructed with mature SAA1 (amino acids 1–36) and SAA3 (amino acids 37–103), and vice versa for rSAA3/1, were added to murine colonic epithelial CMT-93 cells, and the mRNA expressions of MUC2 and cytokines were measured. Inhibition assays with NF-κB inhibitor or TLR4/MD2 inhibitor were also performed. Up-regulation of MUC2 mRNA expression was strongly stimulated by rSAA3 and rSAA3/1, but not by rSAA1 or rSAA1/3. Moreover, NF-κB and TLR4/MD2 inhibitors suppressed the increase of MUC2 mRNA expression. These results suggest that the major responsible region for MUC2 expression exists in amino acids 1–36 of SAA3, and that up-regulations of MUC2 expression by SAA3 and SAA3/1 are involved with activation of NF-κB via the TLR4/MD2 complex.
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Affiliation(s)
- Manami Tashiro
- Laboratory of Food and Environmental Hygiene, Cooperative Department of Veterinary Medicine, Faculty of Applied Biological Sciences, Gifu University, Gifu, Japan
| | - Ami Iwata
- Laboratory of Food and Environmental Hygiene, Cooperative Department of Veterinary Medicine, Faculty of Applied Biological Sciences, Gifu University, Gifu, Japan
| | - Marika Yamauchi
- Laboratory of Food and Environmental Hygiene, Cooperative Department of Veterinary Medicine, Faculty of Applied Biological Sciences, Gifu University, Gifu, Japan
| | - Kaori Shimizu
- Laboratory of Food and Environmental Hygiene, Cooperative Department of Veterinary Medicine, Faculty of Applied Biological Sciences, Gifu University, Gifu, Japan
| | - Ayaka Okada
- Laboratory of Food and Environmental Hygiene, Cooperative Department of Veterinary Medicine, Faculty of Applied Biological Sciences, Gifu University, Gifu, Japan
| | - Naotaka Ishiguro
- Laboratory of Food and Environmental Hygiene, Cooperative Department of Veterinary Medicine, Faculty of Applied Biological Sciences, Gifu University, Gifu, Japan
- The United Graduate School of Veterinary Sciences, Gifu University, Gifu, Japan
| | - Yasuo Inoshima
- Laboratory of Food and Environmental Hygiene, Cooperative Department of Veterinary Medicine, Faculty of Applied Biological Sciences, Gifu University, Gifu, Japan
- The United Graduate School of Veterinary Sciences, Gifu University, Gifu, Japan
- Education and Research Center for Food Animal Health, Gifu University (GeFAH), Yanagido, Gifu, Gifu, Japan
- * E-mail:
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28
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Erickson MA, Jude J, Zhao H, Rhea EM, Salameh TS, Jester W, Pu S, Harrowitz J, Nguyen N, Banks WA, Panettieri RA, Jordan-Sciutto KL. Serum amyloid A: an ozone-induced circulating factor with potentially important functions in the lung-brain axis. FASEB J 2017; 31:3950-3965. [PMID: 28533327 DOI: 10.1096/fj.201600857rrr] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2016] [Accepted: 05/01/2017] [Indexed: 01/24/2023]
Abstract
Accumulating evidence suggests that O3 exposure may contribute to CNS dysfunction. Here, we posit that inflammatory and acute-phase proteins in the circulation increase after O3 exposure and systemically convey signals of O3 exposure to the CNS. To model acute O3 exposure, female Balb/c mice were exposed to 3 ppm O3 or forced air for 2 h and were studied after 6 or 24 h. Of 23 cytokines and chemokines, only KC/CXCL1 was increased in blood 6 h after O3 exposure. The acute-phase protein serum amyloid A (A-SAA) was significantly increased by 24 h, whereas C-reactive protein was unchanged. A-SAA in blood correlated with total leukocytes, macrophages, and neutrophils in bronchoalveolar lavage from O3-exposed mice. A-SAA mRNA and protein were increased in the liver. We found that both isoforms of A-SAA completely crossed the intact blood-brain barrier, although the rate of SAA2.1 influx was approximately 5 times faster than that of SAA1.1. Finally, A-SAA protein, but not mRNA, was increased in the CNS 24 h post-O3 exposure. Our findings suggest that A-SAA is functionally linked to pulmonary inflammation in our O3 exposure model and that A-SAA could be an important systemic signal of O3 exposure to the CNS.-Erickson, M. A., Jude, J., Zhao, H., Rhea, E. M., Salameh, T. S., Jester, W., Pu, S., Harrowitz, J., Nguyen, N., Banks, W. A., Panettieri, R. A., Jr., Jordan-Sciutto, K. L. Serum amyloid A: an ozone-induced circulating factor with potentially important functions in the lung-brain axis.
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Affiliation(s)
- Michelle A Erickson
- Department of Pathology, School of Dental Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA; .,Geriatrics Research Education and Clinical Center, Veterans Affairs Puget Sound Health Care System, Seattle, Washington, USA.,Division of Gerontology and Geriatric Medicine, Department of Medicine, University of Washington School of Medicine, Seattle, Washington, USA
| | - Joseph Jude
- Rutgers Institute for Translational Medicine and Science, Child Health Institute, Rutgers University, New Brunswick, New Jersey, USA.,Division of Pulmonary, Allergy, and Critical Care, Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Hengjiang Zhao
- Division of Pulmonary, Allergy, and Critical Care, Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Elizabeth M Rhea
- Geriatrics Research Education and Clinical Center, Veterans Affairs Puget Sound Health Care System, Seattle, Washington, USA.,Division of Gerontology and Geriatric Medicine, Department of Medicine, University of Washington School of Medicine, Seattle, Washington, USA
| | - Therese S Salameh
- Geriatrics Research Education and Clinical Center, Veterans Affairs Puget Sound Health Care System, Seattle, Washington, USA.,Division of Gerontology and Geriatric Medicine, Department of Medicine, University of Washington School of Medicine, Seattle, Washington, USA
| | - William Jester
- Rutgers Institute for Translational Medicine and Science, Child Health Institute, Rutgers University, New Brunswick, New Jersey, USA.,Division of Pulmonary, Allergy, and Critical Care, Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Shelley Pu
- Department of Pathology, School of Dental Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Jenna Harrowitz
- Department of Pathology, School of Dental Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Ngan Nguyen
- Division of Pulmonary, Allergy, and Critical Care, Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - William A Banks
- Geriatrics Research Education and Clinical Center, Veterans Affairs Puget Sound Health Care System, Seattle, Washington, USA.,Division of Gerontology and Geriatric Medicine, Department of Medicine, University of Washington School of Medicine, Seattle, Washington, USA
| | - Reynold A Panettieri
- Geriatrics Research Education and Clinical Center, Veterans Affairs Puget Sound Health Care System, Seattle, Washington, USA.,Division of Pulmonary, Allergy, and Critical Care, Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Kelly L Jordan-Sciutto
- Department of Pathology, School of Dental Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
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29
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Samsoondar JP, Burke AC, Sutherland BG, Telford DE, Sawyez CG, Edwards JY, Pinkosky SL, Newton RS, Huff MW. Prevention of Diet-Induced Metabolic Dysregulation, Inflammation, and Atherosclerosis in
Ldlr
−/−
Mice by Treatment With the ATP-Citrate Lyase Inhibitor Bempedoic Acid. Arterioscler Thromb Vasc Biol 2017; 37:647-656. [DOI: 10.1161/atvbaha.116.308963] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2016] [Accepted: 01/17/2017] [Indexed: 02/05/2023]
Abstract
Objective—
Bempedoic acid (ETC-1002, 8-hydroxy-2,2,14,14-tetramethylpentadecanedioic acid) is a novel low-density lipoprotein cholesterol–lowering compound. In animals, bempedoic acid targets the liver where it inhibits cholesterol and fatty acid synthesis through inhibition of ATP-citrate lyase and through activation of AMP-activated protein kinase. In this study, we tested the hypothesis that bempedoic acid would prevent diet-induced metabolic dysregulation, inflammation, and atherosclerosis.
Approach and Results—
Ldlr
−/−
mice were fed a high-fat, high-cholesterol diet (42% kcal fat, 0.2% cholesterol) supplemented with bempedoic acid at 0, 3, 10 and 30 mg/kg body weight/day. Treatment for 12 weeks dose-dependently attenuated diet-induced hypercholesterolemia, hypertriglyceridemia, hyperglycemia, hyperinsulinemia, fatty liver and obesity. Compared to high-fat, high-cholesterol alone, the addition of bempedoic acid decreased plasma triglyceride (up to 64%) and cholesterol (up to 50%) concentrations, and improved glucose tolerance. Adiposity was significantly reduced with treatment. In liver, bempedoic acid prevented cholesterol and triglyceride accumulation, which was associated with increased fatty acid oxidation and reduced fatty acid synthesis. Hepatic gene expression analysis revealed that treatment significantly increased expression of genes involved in fatty acid oxidation while suppressing inflammatory gene expression. In full-length aorta, bempedoic acid markedly suppressed cholesteryl ester accumulation, attenuated the expression of proinflammatory M1 genes and attenuated the
iNos
/
Arg1
ratio. Treatment robustly attenuated atherosclerotic lesion development in the aortic sinus by 44%, with beneficial changes in morphology, characteristic of earlier-stage lesions.
Conclusions—
Bempedoic acid effectively prevents plasma and tissue lipid elevations and attenuates the onset of inflammation, leading to the prevention of atherosclerotic lesion development in a mouse model of metabolic dysregulation.
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Affiliation(s)
- Joshua P. Samsoondar
- From the Molecular Medicine Research Laboratory, Robarts Research Institute (J.P.S., A.C.B., B.G.S., D.E.T., C.G.S., J.Y.E., M.W.H.), Department of Biochemistry (J.P.S., A.C.B., M.W.H.), and Department of Medicine (D.E.T., C.G.S., J.Y.E., M.W.H.), The University of Western Ontario, London, Canada; and Esperion Therapeutics Inc, Ann Arbor, MI (S.L.P., R.S.N.)
| | - Amy C. Burke
- From the Molecular Medicine Research Laboratory, Robarts Research Institute (J.P.S., A.C.B., B.G.S., D.E.T., C.G.S., J.Y.E., M.W.H.), Department of Biochemistry (J.P.S., A.C.B., M.W.H.), and Department of Medicine (D.E.T., C.G.S., J.Y.E., M.W.H.), The University of Western Ontario, London, Canada; and Esperion Therapeutics Inc, Ann Arbor, MI (S.L.P., R.S.N.)
| | - Brian G. Sutherland
- From the Molecular Medicine Research Laboratory, Robarts Research Institute (J.P.S., A.C.B., B.G.S., D.E.T., C.G.S., J.Y.E., M.W.H.), Department of Biochemistry (J.P.S., A.C.B., M.W.H.), and Department of Medicine (D.E.T., C.G.S., J.Y.E., M.W.H.), The University of Western Ontario, London, Canada; and Esperion Therapeutics Inc, Ann Arbor, MI (S.L.P., R.S.N.)
| | - Dawn E. Telford
- From the Molecular Medicine Research Laboratory, Robarts Research Institute (J.P.S., A.C.B., B.G.S., D.E.T., C.G.S., J.Y.E., M.W.H.), Department of Biochemistry (J.P.S., A.C.B., M.W.H.), and Department of Medicine (D.E.T., C.G.S., J.Y.E., M.W.H.), The University of Western Ontario, London, Canada; and Esperion Therapeutics Inc, Ann Arbor, MI (S.L.P., R.S.N.)
| | - Cynthia G. Sawyez
- From the Molecular Medicine Research Laboratory, Robarts Research Institute (J.P.S., A.C.B., B.G.S., D.E.T., C.G.S., J.Y.E., M.W.H.), Department of Biochemistry (J.P.S., A.C.B., M.W.H.), and Department of Medicine (D.E.T., C.G.S., J.Y.E., M.W.H.), The University of Western Ontario, London, Canada; and Esperion Therapeutics Inc, Ann Arbor, MI (S.L.P., R.S.N.)
| | - Jane Y. Edwards
- From the Molecular Medicine Research Laboratory, Robarts Research Institute (J.P.S., A.C.B., B.G.S., D.E.T., C.G.S., J.Y.E., M.W.H.), Department of Biochemistry (J.P.S., A.C.B., M.W.H.), and Department of Medicine (D.E.T., C.G.S., J.Y.E., M.W.H.), The University of Western Ontario, London, Canada; and Esperion Therapeutics Inc, Ann Arbor, MI (S.L.P., R.S.N.)
| | - Stephen L. Pinkosky
- From the Molecular Medicine Research Laboratory, Robarts Research Institute (J.P.S., A.C.B., B.G.S., D.E.T., C.G.S., J.Y.E., M.W.H.), Department of Biochemistry (J.P.S., A.C.B., M.W.H.), and Department of Medicine (D.E.T., C.G.S., J.Y.E., M.W.H.), The University of Western Ontario, London, Canada; and Esperion Therapeutics Inc, Ann Arbor, MI (S.L.P., R.S.N.)
| | - Roger S. Newton
- From the Molecular Medicine Research Laboratory, Robarts Research Institute (J.P.S., A.C.B., B.G.S., D.E.T., C.G.S., J.Y.E., M.W.H.), Department of Biochemistry (J.P.S., A.C.B., M.W.H.), and Department of Medicine (D.E.T., C.G.S., J.Y.E., M.W.H.), The University of Western Ontario, London, Canada; and Esperion Therapeutics Inc, Ann Arbor, MI (S.L.P., R.S.N.)
| | - Murray W. Huff
- From the Molecular Medicine Research Laboratory, Robarts Research Institute (J.P.S., A.C.B., B.G.S., D.E.T., C.G.S., J.Y.E., M.W.H.), Department of Biochemistry (J.P.S., A.C.B., M.W.H.), and Department of Medicine (D.E.T., C.G.S., J.Y.E., M.W.H.), The University of Western Ontario, London, Canada; and Esperion Therapeutics Inc, Ann Arbor, MI (S.L.P., R.S.N.)
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de Oliveira EM, Visniauskas B, Tufik S, Andersen ML, Chagas JR, Campa A. Serum Amyloid A Production Is Triggered by Sleep Deprivation in Mice and Humans: Is That the Link between Sleep Loss and Associated Comorbidities? Nutrients 2017; 9:nu9030311. [PMID: 28335560 PMCID: PMC5372974 DOI: 10.3390/nu9030311] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Revised: 03/07/2017] [Accepted: 03/16/2017] [Indexed: 01/26/2023] Open
Abstract
Serum amyloid A (SAA) was recently associated with metabolic endotoxemia, obesity and insulin resistance. Concurrently, insufficient sleep adversely affects metabolic health and is an independent predisposing factor for obesity and insulin resistance. In this study we investigated whether sleep loss modulates SAA production. The serum SAA concentration increased in C57BL/6 mice subjected to sleep restriction (SR) for 15 days or to paradoxical sleep deprivation (PSD) for 72 h. Sleep restriction also induced the upregulation of Saa1.1/Saa2.1 mRNA levels in the liver and Saa3 mRNA levels in adipose tissue. SAA levels returned to the basal range after 24 h in paradoxical sleep rebound (PSR). Metabolic endotoxemia was also a finding in SR. Increased plasma levels of SAA were also observed in healthy human volunteers subjected to two nights of total sleep deprivation (Total SD), returning to basal levels after one night of recovery. The observed increase in SAA levels may be part of the initial biochemical alterations caused by sleep deprivation, with potential to drive deleterious conditions such as metabolic endotoxemia and weight gain.
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Affiliation(s)
- Edson M de Oliveira
- Departamento de Análises Clínicas e Toxicológicas, Universidade de São Paulo, Av. Prof. Lineu Prestes, 580, São Paulo SP 05509-000, Brazil.
| | - Bruna Visniauskas
- Departamento de Psicobiologia, Universidade Federal de São Paulo, Rua Napoleão de Barros, 925, São Paulo SP 04024-002, Brazil.
| | - Sergio Tufik
- Departamento de Psicobiologia, Universidade Federal de São Paulo, Rua Napoleão de Barros, 925, São Paulo SP 04024-002, Brazil.
| | - Monica L Andersen
- Departamento de Psicobiologia, Universidade Federal de São Paulo, Rua Napoleão de Barros, 925, São Paulo SP 04024-002, Brazil.
| | - Jair R Chagas
- Departamento de Psicobiologia, Universidade Federal de São Paulo, Rua Napoleão de Barros, 925, São Paulo SP 04024-002, Brazil.
| | - Ana Campa
- Departamento de Análises Clínicas e Toxicológicas, Universidade de São Paulo, Av. Prof. Lineu Prestes, 580, São Paulo SP 05509-000, Brazil.
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IL-17 axis accelerates the inflammatory progression of obese in mice via TBK1 and IKBKE pathway. Immunol Lett 2017; 184:67-75. [PMID: 28237848 DOI: 10.1016/j.imlet.2017.02.004] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Revised: 02/04/2017] [Accepted: 02/09/2017] [Indexed: 02/06/2023]
Abstract
Obesity mediates immune inflammatory response and induces IL-17 expression. Adipgenesis can be regulated by IL-17 and it causes TBK1 activation. The inhibition of TBK1 and the inhibition of I IKBKE reduces inflammatory response and improves obesity. It is hypothesized that IL-17 deficiency inhibits obesity progression and inflammation. 3T3-L1 preadipocytes were differentiated in vitro and treated with IL-17. RAW264.7 cells and differentiated 3T3-L1 were pretreated with TBK1 inhibitor and then stimulated with IL-17. Wild-type and IL-17 knock out mice were fed with high-fat diet. IL-17 inhibits adipocyte differentiation from mouse-derived 3T3-L1 preadipocytes and reduces mRNA expression of proadipogenic transcription factors and adipokines in adipocyte cells. IL-17 also showed up-regulation of mRNA levels of inflammatory cytokines in RAW cells. The inhibitor of TBK1 and IKBKE attenuates the effect of IL-17. Loss of IL-17 deficiency improves diet-induced obesity, fatty liver, glucose and lipid metabolism in mice. The expression of TBK1 and IKBKE decreased in the spleen and liver of IL-17 deficiency mice. Moreover, the inflammatory response within the visceral adipose tissue and Th1 cells were inhibited, however, M2 macrophage and Th2 cells increased in IL-17 deficiency mice. IL-17 inhibits adipogenesis where a lack of IL-17 ameliorates glucose metabolism. As well, the inhibition of TBK1 reduces inflammation induced by IL-17. Therefore, IL-17 may be involved in the development of obesity and metabolic dysfunction in a TBK1-dependent manner.
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Salvesen Ø, Reiten MR, Heegaard PMH, Tranulis MA, Espenes A, Skovgaard K, Ersdal C. Activation of innate immune genes in caprine blood leukocytes after systemic endotoxin challenge. BMC Vet Res 2016; 12:241. [PMID: 27793136 PMCID: PMC5084394 DOI: 10.1186/s12917-016-0870-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Accepted: 10/20/2016] [Indexed: 12/19/2022] Open
Abstract
Background Sepsis is a serious health problem associated with a range of infectious diseases in animals and humans. Early events of this syndrome can be mimicked by experimental administration of lipopolysaccharides (LPS). Compared with mice, small ruminants and humans are highly sensitive to LPS, making goats valuable in inflammatory models. We performed a longitudinal study in eight Norwegian dairy goats that received LPS (0.1 μg/kg, Escherichia coli O26:B6) intravenously. A control group of five goats received corresponding volumes of sterile saline. Clinical examinations were performed continuously, and blood samples were collected throughout the trial. Results Characteristic signs of acute sepsis, such as sickness behavior, fever, and leukopenia were observed within 1 h of LPS administration. A high-throughput longitudinal gene expression analysis of circulating leukocytes was performed, and genes associated with the acute phase response, type I interferon signaling, LPS cascade and apoptosis, in addition to cytokines and chemokines were targeted. Pro-inflammatory genes, such as IL1B, CCL3 and IL8, were significantly up-regulated. Interestingly, increased mRNA levels of seven interferon stimulated genes (ISGs) were observed peaking at 2 h, corroborating the increasing evidence that ISGs respond immediately to bacterial endotoxins. A slower response was manifested by four extrahepatic acute phase proteins (APP) (SAA3, HP, LF and LCN2) reaching maximum levels at 5 h. Conclusions We report an immediate induction of ISGs in leukocytes in response to LPS supporting a link between the interferon system and defense against bacterial infections. The extrahepatic expression of APPs suggests that leukocytes contribute to synthesis of these proteins at the beginning of a systemic inflammation. Taken together, these findings provide insights into the dynamic regulation of innate immune genes, as well as raising new questions regarding the importance of ISGs and extrahepatic APPs in leukocytes after systemic endotoxin challenge. Electronic supplementary material The online version of this article (doi:10.1186/s12917-016-0870-x) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Øyvind Salvesen
- Faculty of Veterinary Medicine and Biosciences, Norwegian University of Life Sciences, Oslo, Norway
| | - Malin R Reiten
- Faculty of Veterinary Medicine and Biosciences, Norwegian University of Life Sciences, Oslo, Norway
| | - Peter M H Heegaard
- Innate Immunology Group, Section for Immunology and Vaccinology, National Veterinary Institute, Technical University of Denmark, Frederiksberg, Denmark
| | - Michael A Tranulis
- Faculty of Veterinary Medicine and Biosciences, Norwegian University of Life Sciences, Oslo, Norway
| | - Arild Espenes
- Faculty of Veterinary Medicine and Biosciences, Norwegian University of Life Sciences, Oslo, Norway
| | - Kerstin Skovgaard
- Innate Immunology Group, Section for Immunology and Vaccinology, National Veterinary Institute, Technical University of Denmark, Frederiksberg, Denmark
| | - Cecilie Ersdal
- Faculty of Veterinary Medicine and Biosciences, Norwegian University of Life Sciences, Oslo, Norway.
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Abstract
PURPOSE OF REVIEW Atherosclerosis is a chronic inflammation associated with increased expression of the acute phase isoforms of serum amyloid A (SAA) and in humans is a plasma biomarker for future cardiovascular events. However, whether SAA is only a biomarker or participates in the development of cardiovascular disease is not well characterized. The purpose of this review is to summarize putative functions of SAA relevant to atherogenesis and in-vivo murine studies that directly examine the effect of SAA on atherosclerosis. RECENT FINDINGS Modulation of the expression of SAA1 and/or SAA2 in murine models of atherosclerosis suggests that SAA promotes early atherogenesis. SAA secreted from bone-marrow-derived cells contributes to this antiatherogenic phenotype. SAA also promotes angiotensin-induced abdominal aneurysm in atherogenic mouse models. The reduction in atherosclerosis may be due, at least in part, to remodeling of the acute phase HDL to reduce its capacity to promote cholesterol efflux and reduce its anti-inflammatory ability. SUMMARY SAA is more than a marker of cardiovascular disease and is a participant in the early atherogenic process.
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Affiliation(s)
- Godfrey S Getz
- aDepartment of Pathology bDepartment of Medicine cBen May Institute for Cancer Biology, University of Chicago, Chicago, Illinois, USA
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de Oliveira EM, Ascar TP, Silva JC, Sandri S, Migliorini S, Fock RA, Campa A. Serum amyloid A links endotoxaemia to weight gain and insulin resistance in mice. Diabetologia 2016; 59:1760-8. [PMID: 27126803 DOI: 10.1007/s00125-016-3970-z] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Accepted: 04/06/2016] [Indexed: 01/21/2023]
Abstract
AIMS/HYPOTHESIS Pre-adipocytes and adipocytes are responsive to the acute phase protein serum amyloid A (SAA). The combined effects triggered by SAA encompass an increase in pre-adipocyte proliferation, an induction of TNF-α and IL-6 release and a decrease in glucose uptake in mature adipocytes, strongly supporting a role for SAA in obesity and related comorbidities. This study addressed whether SAA depletion modulates weight gain and insulin resistance induced by a high-fat diet (HFD). METHODS Male Swiss Webster mice were fed an HFD for 10 weeks under an SAA-targeted antisense oligonucleotide (ASOSAA) treatment in order to evaluate the role of SAA in weight gain. RESULTS With ASOSAA treatment, mice receiving an HFD did not differ in energy intake when compared with their controls, but were prevented from gaining weight and developing insulin resistance. The phenotype was characterised by a lack of adipose tissue expansion, with low accumulation of epididymal, retroperitoneal and subcutaneous fat content and decreased inflammatory markers, such as SAA3 and toll-like receptor (TLR)-4 expression, as well as macrophage infiltration into the adipose tissue. Furthermore, a metabolic status similar to chow-fed mice counterparts could be observed, with equivalent levels of leptin, adiponectin, IGF-I, SAA, fasting glucose and insulin, and remarkable improvement in glucose and insulin tolerance test profiles. Surprisingly, the expected HFD-induced metabolic endotoxaemia was also prevented by the ASOSAA treatment. CONCLUSIONS/INTERPRETATION This study provides further evidence of the role of SAA in weight gain and insulin resistance. Moreover, we also suggest that beyond its proliferative and inflammatory effects, SAA is part of the lipopolysaccharide signalling pathway that links inflammation to obesity and insulin resistance.
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Affiliation(s)
- Edson M de Oliveira
- Departamento de Análises Clínicas e Toxicológicas, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, 580 Lineu Prestes Avenue, São Paulo, SP, 05508-000, Brazil
| | - Thais P Ascar
- Departamento de Análises Clínicas e Toxicológicas, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, 580 Lineu Prestes Avenue, São Paulo, SP, 05508-000, Brazil
| | - Jacqueline C Silva
- Departamento de Análises Clínicas e Toxicológicas, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, 580 Lineu Prestes Avenue, São Paulo, SP, 05508-000, Brazil
| | - Silvana Sandri
- Departamento de Análises Clínicas e Toxicológicas, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, 580 Lineu Prestes Avenue, São Paulo, SP, 05508-000, Brazil
| | - Silene Migliorini
- Departamento de Análises Clínicas e Toxicológicas, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, 580 Lineu Prestes Avenue, São Paulo, SP, 05508-000, Brazil
| | - Ricardo A Fock
- Departamento de Análises Clínicas e Toxicológicas, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, 580 Lineu Prestes Avenue, São Paulo, SP, 05508-000, Brazil
| | - Ana Campa
- Departamento de Análises Clínicas e Toxicológicas, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, 580 Lineu Prestes Avenue, São Paulo, SP, 05508-000, Brazil.
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Jang WY, Jeong J, Kim S, Kang MC, Sung YH, Choi M, Park SJ, Kim MO, Kim SH, Ryoo ZY. Serum amyloid A1 levels and amyloid deposition following a high-fat diet challenge in transgenic mice overexpressing hepatic serum amyloid A1. Appl Physiol Nutr Metab 2016; 41:640-648. [PMID: 27218680 DOI: 10.1139/apnm-2015-0369] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2023]
Abstract
Serum amyloid A (SAA) is an acute-phase response protein in the liver, and SAA1 is the major precursor protein involved in amyloid A amyloidosis. This amyloidosis has been reported as a complication in chronic inflammatory conditions such as arthritis, lupus, and Crohn's disease. Obesity is also associated with chronic, low-grade inflammation and sustained, elevated levels of SAA1. However, the contribution of elevated circulating SAA1 to metabolic disturbances and their complications is unclear. Furthermore, in several recent studies of transgenic (TG) mice overexpressing SAA1 that were fed a high-fat diet (HFD) for a relatively short period, no relationship was found between SAA1 up-regulation and metabolic disturbances. Therefore, we generated TG mice overexpressing SAA1 in the liver, challenged these mice with an HFD, and investigated the influence of elevated SAA1 levels. Sustained, elevated levels of SAA1 were correlated with metabolic parameters and local cytokine expression in the liver following 16 weeks on the HFD. Moreover, prolonged consumption (52 weeks) of the HFD was associated with impaired glucose tolerance and elevated SAA1 levels and resulted in systemic SAA1-derived amyloid deposition in the kidney, liver, and spleen of TG mice. Thus, we concluded that elevated SAA1 levels under long-term HFD exposure result in extensive SAA1-derived amyloid deposits, which may contribute to the complications associated with HFD-induced obesity and metabolic disorders.
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Affiliation(s)
- Woo Young Jang
- a School of Life Sciences, KNU Creative BioResearch Group (BK21 Plus Project), Kyungpook National University, 1370 Sankyuk-dong, Daegu, 702-701, Republic of Korea
| | - Jain Jeong
- a School of Life Sciences, KNU Creative BioResearch Group (BK21 Plus Project), Kyungpook National University, 1370 Sankyuk-dong, Daegu, 702-701, Republic of Korea
| | - Seonggon Kim
- a School of Life Sciences, KNU Creative BioResearch Group (BK21 Plus Project), Kyungpook National University, 1370 Sankyuk-dong, Daegu, 702-701, Republic of Korea
- b Laboratory Animal Center, Daegu-Gyeongbuk Medical Innovation Foundation, Dong-gu, Daegu, 701-310 Republic of Korea
| | - Min-Cheol Kang
- a School of Life Sciences, KNU Creative BioResearch Group (BK21 Plus Project), Kyungpook National University, 1370 Sankyuk-dong, Daegu, 702-701, Republic of Korea
| | - Yong Hun Sung
- a School of Life Sciences, KNU Creative BioResearch Group (BK21 Plus Project), Kyungpook National University, 1370 Sankyuk-dong, Daegu, 702-701, Republic of Korea
| | - Minjee Choi
- a School of Life Sciences, KNU Creative BioResearch Group (BK21 Plus Project), Kyungpook National University, 1370 Sankyuk-dong, Daegu, 702-701, Republic of Korea
| | - Si Jun Park
- a School of Life Sciences, KNU Creative BioResearch Group (BK21 Plus Project), Kyungpook National University, 1370 Sankyuk-dong, Daegu, 702-701, Republic of Korea
| | - Myoung Ok Kim
- c Department of Animal Science, Kyungpook National University, 386 Gajangdong, Sangju, 742-711, Republic of Korea
| | - Sung Hyun Kim
- a School of Life Sciences, KNU Creative BioResearch Group (BK21 Plus Project), Kyungpook National University, 1370 Sankyuk-dong, Daegu, 702-701, Republic of Korea
| | - Zae Young Ryoo
- a School of Life Sciences, KNU Creative BioResearch Group (BK21 Plus Project), Kyungpook National University, 1370 Sankyuk-dong, Daegu, 702-701, Republic of Korea
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Sun L, Ye RD. Serum amyloid A1: Structure, function and gene polymorphism. Gene 2016; 583:48-57. [PMID: 26945629 DOI: 10.1016/j.gene.2016.02.044] [Citation(s) in RCA: 126] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Revised: 02/24/2016] [Accepted: 02/29/2016] [Indexed: 02/07/2023]
Abstract
Inducible expression of serum amyloid A (SAA) is a hallmark of the acute-phase response, which is a conserved reaction of vertebrates to environmental challenges such as tissue injury, infection and surgery. Human SAA1 is encoded by one of the four SAA genes and is the best-characterized SAA protein. Initially known as a major precursor of amyloid A (AA), SAA1 has been found to play an important role in lipid metabolism and contributes to bacterial clearance, the regulation of inflammation and tumor pathogenesis. SAA1 has five polymorphic coding alleles (SAA1.1-SAA1.5) that encode distinct proteins with minor amino acid substitutions. Single nucleotide polymorphism (SNP) has been identified in both the coding and non-coding regions of human SAA1. Despite high levels of sequence homology among these variants, SAA1 polymorphisms have been reported as risk factors of cardiovascular diseases and several types of cancer. A recently solved crystal structure of SAA1.1 reveals a hexameric bundle with each of the SAA1 subunits assuming a 4-helix structure stabilized by the C-terminal tail. Analysis of the native SAA1.1 structure has led to the identification of a competing site for high-density lipoprotein (HDL) and heparin, thus providing the structural basis for a role of heparin and heparan sulfate in the conversion of SAA1 to AA. In this brief review, we compares human SAA1 with other forms of human and mouse SAAs, and discuss how structural and genetic studies of SAA1 have advanced our understanding of the physiological functions of the SAA proteins.
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Affiliation(s)
- Lei Sun
- School of Pharmacy, Shanghai Jiao Tong University, Shanghai, China
| | - Richard D Ye
- School of Pharmacy, Shanghai Jiao Tong University, Shanghai, China; Institute of Chinese Medical Sciences and State Key Laboratory of Quality Research in Chinese Medicine, University of Macau, Macau, SAR, China.
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Krishnan S, Huang J, Lee H, Guerrero A, Berglund L, Anuurad E, Lebrilla CB, Zivkovic AM. Combined High-Density Lipoprotein Proteomic and Glycomic Profiles in Patients at Risk for Coronary Artery Disease. J Proteome Res 2015; 14:5109-18. [DOI: 10.1021/acs.jproteome.5b00730] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | | | | | - Lars Berglund
- Department
of Veterans Affairs, Northern California Health Care System, Sacramento, California 95655, United States
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Smith BW, Miller RJ, Wilund KR, O’Brien WD, Erdman JW. Effects of Tomato and Soy Germ on Lipid Bioaccumulation and Atherosclerosis in ApoE-/- Mice. J Food Sci 2015; 80:H1918-25. [PMID: 26173004 PMCID: PMC4606862 DOI: 10.1111/1750-3841.12968] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Accepted: 06/07/2015] [Indexed: 01/05/2023]
Abstract
Dietary patterns with cardiovascular benefits have been recommended, but the relative contributions of individual foods and food components, alone or in combination, remain undefined. Male ApoE(-/-) mice were fed either a purified AIN-93G control diet, a Western diet (WD), or a WD with 10% tomato powder (TP), 2% soy germ (SG), or the combination, for 4 wk (n = 10 per group). Plasma total cholesterol and triglycerides were measured with enzymatic colorimetric kits, and serum amyloid A (SAA) was measured by ELISA. Liver lipids were extracted with chloroform:methanol, and triglycerides, free and esterified cholesterol measured with enzymatic colorimetric kits. Expression of Cyp27a1, Cyp7a1, Abcg5, and Abcg8 in the liver was determined by quantitative polymerase chain reaction. Sections of the aortic root and aorta were cut and stained with hematoxylin and eosin (H&E) to assess extent of atherosclerotic lesions. WD-fed animals had greater liver and adipose weights, plasma cholesterol and SAA, hepatic lipids, and atherosclerosis than AIN-93G animals. TP and SG did not decrease atherosclerosis as measured by H&E-stained sections of the aortic root, aortic arch, and descending aorta. The TP diets further increased plasma cholesterol, but also led to increased expression of the Abcg5/8 transporters involved in cholesterol efflux. Addition of SG alone to the WD attenuated WD-induced increases in plasma cholesterol, liver lipids, and gonadal adipose weight. The results of this study do not support the use of either TP or SG for reduction of atherosclerosis, but suggest some beneficial effects of SG on lipid metabolism in this model of cardiovascular disease.
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Affiliation(s)
- Brendon W. Smith
- Division of Nutritional Sciences, University of Illinois at Urbana-Champaign
- Bioacoustics Research Laboratory, Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign
| | - Rita J. Miller
- Bioacoustics Research Laboratory, Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign
| | - Kenneth R. Wilund
- Division of Nutritional Sciences, University of Illinois at Urbana-Champaign
- Department of Kinesiology, University of Illinois at Urbana-Champaign
| | - William D. O’Brien
- Division of Nutritional Sciences, University of Illinois at Urbana-Champaign
- Bioacoustics Research Laboratory, Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign
| | - John W. Erdman
- Division of Nutritional Sciences, University of Illinois at Urbana-Champaign
- Department of Food Science and Human Nutrition, University of Illinois at Urbana-Champaign
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Ye RD, Sun L. Emerging functions of serum amyloid A in inflammation. J Leukoc Biol 2015; 98:923-9. [PMID: 26130702 DOI: 10.1189/jlb.3vmr0315-080r] [Citation(s) in RCA: 195] [Impact Index Per Article: 21.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2015] [Accepted: 06/02/2015] [Indexed: 12/12/2022] Open
Abstract
SAA is a major acute-phase protein produced in large quantity during APR. The rise of SAA concentration in blood circulation during APR has been a clinical marker for active inflammation. In the past decade, research has been conducted to determine whether SAA plays an active role during inflammation and if so, how it influences the course of inflammation. These efforts have led to the discovery of cytokine-like activities of rhSAA, which is commercially available and widely used in most of the published studies. SAA activates multiple receptors, including the FPR2, the TLRs TLR2 and TLR4, the scavenger receptor SR-BI, and the ATP receptor P2X7. More recent studies have shown that SAA not only activates transcription factors, such as NF-κB, but also plays a role in epigenetic regulation through a MyD88-IRF4-Jmjd3 pathway. It is postulated that the activation of these pathways leads to induced expression of proinflammatory factors and a subset of proteins expressed by the M2 macrophages. These functional properties set SAA apart from well-characterized inflammatory factors, such as LPS and TNF-α, suggesting that it may play a homeostatic role during the course of inflammation. Ongoing and future studies are directed to addressing unresolved issues, including the difference between rSAA and native SAA isoforms and the exact functions of SAA in physiologic and pathologic settings.
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Affiliation(s)
- Richard D Ye
- *School of Pharmacy, Shanghai Jiao Tong University, Shanghai, China; and Department of Pharmacology, University of Illinois at Chicago, Illinois, USA
| | - Lei Sun
- *School of Pharmacy, Shanghai Jiao Tong University, Shanghai, China; and Department of Pharmacology, University of Illinois at Chicago, Illinois, USA
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Tomita T, Ieguchi K, Sawamura T, Maru Y. Human serum amyloid A3 (SAA3) protein, expressed as a fusion protein with SAA2, binds the oxidized low density lipoprotein receptor. PLoS One 2015; 10:e0118835. [PMID: 25738827 PMCID: PMC4349446 DOI: 10.1371/journal.pone.0118835] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2013] [Accepted: 01/16/2015] [Indexed: 11/19/2022] Open
Abstract
Serum amyloid A3 (SAA3) possesses characteristics distinct from the other serum amyloid A isoforms, SAA1, SAA2, and SAA4. High density lipoprotein contains the latter three isoforms, but not SAA3. The expression of mouse SAA3 (mSAA3) is known to be up-regulated extrahepatically in inflammatory responses, and acts as an endogenous ligand for the toll-like receptor 4/MD-2 complex. We previously reported that mSAA3 plays an important role in facilitating tumor metastasis by attracting circulating tumor cells and enhancing hyperpermeability in the lungs. On the other hand, human SAA3 (hSAA3) has long been regarded as a pseudogene, which is in contrast to the abundant expression levels of the other isoforms. Although the nucleotide sequence of hSAA3 is very similar to that of the other SAAs, a single oligonucleotide insertion in exon 2 causes a frame-shift to generate a unique amino acid sequence. In the present study, we identified that hSAA3 was transcribed in the hSAA2-SAA3 fusion transcripts of several human cell lines. In the fusion transcript, hSAA2 exon 3 was connected to hSAA3 exon 1 or hSAA3 exon 2, located approximately 130kb downstream from hSAA2 exon 3 in the genome, which suggested that it is produced by alternative splicing. Furthermore, we succeeded in detecting and isolating hSAA3 protein for the first time by an immunoprecipitation-enzyme linked immune assay system using monoclonal and polyclonal antibodies that recognize the hSAA3 unique amino acid sequence. We also demonstrated that hSAA3 bound oxidized low density lipoprotein receptor (oxLDL receptor, LOX-1) and elevated the phosphorylation of ERK, the intracellular MAP-kinase signaling protein.
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Affiliation(s)
- Takeshi Tomita
- Department of Pharmacology, Tokyo Women’s Medical University, Tokyo, Japan
- * E-mail: (TT); (YM)
| | - Katsuaki Ieguchi
- Department of Pharmacology, Tokyo Women’s Medical University, Tokyo, Japan
| | - Tatsuya Sawamura
- Department of Vascular Physiology, National Cerebral and Cardiovascular Center, Suita, Osaka, Japan
| | - Yoshiro Maru
- Department of Pharmacology, Tokyo Women’s Medical University, Tokyo, Japan
- * E-mail: (TT); (YM)
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Expression of α1-acid glycoprotein and lipopolysaccharide binding protein in visceral and subcutaneous adipose tissue of dairy cattle. Vet J 2015; 203:223-7. [DOI: 10.1016/j.tvjl.2014.12.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2014] [Revised: 11/30/2014] [Accepted: 12/01/2014] [Indexed: 11/21/2022]
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McEneny J, Daniels JA, McGowan A, Gunness A, Moore K, Stevenson M, Young IS, Gibney J. A Cross-Sectional Study Demonstrating Increased Serum Amyloid A Related Inflammation in High-Density Lipoproteins from Subjects with Type 1 Diabetes Mellitus and How this Association Was Augmented by Poor Glycaemic Control. J Diabetes Res 2015; 2015:351601. [PMID: 26557720 PMCID: PMC4628656 DOI: 10.1155/2015/351601] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/27/2014] [Accepted: 10/08/2014] [Indexed: 11/24/2022] Open
Abstract
Inflammatory atherosclerosis is increased in subjects with type 1 diabetes mellitus (T1DM). Normally high-density lipoproteins (HDL) protect against atherosclerosis; however, in the presence of serum amyloid-A- (SAA-) related inflammation this property may be reduced. Fasting blood was obtained from fifty subjects with T1DM, together with fifty age, gender and BMI matched control subjects. HDL was subfractionated into HDL2 and HDL3 by rapid ultracentrifugation. Serum-hsCRP and serum-, HDL2-, and HDL3-SAA were measured by ELISAs. Compared to control subjects, SAA was increased in T1DM subjects, nonsignificantly in serum (P = 0.088), and significantly in HDL2(P = 0.003) and HDL3(P = 0.005). When the T1DM group were separated according to mean HbA1c (8.34%), serum-SAA and HDL3-SAA levels were higher in the T1DM subjects with HbA1c ≥ 8.34%, compared to when HbA1c was <8.34% (P < 0.05). Furthermore, regression analysis illustrated, that for every 1%-unit increase in HbA1c, SAA increased by 20% and 23% in HDL2 and HDL3, respectively, independent of BMI. HsCRP did not differ between groups (P > 0.05). This cross-sectional study demonstrated increased SAA-related inflammation in subjects with T1DM that was augmented by poor glycaemic control. We suggest that SAA is a useful inflammatory biomarker in T1DM, which may contribute to their increased atherosclerosis risk.
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Affiliation(s)
- Jane McEneny
- Centre for Public Health, Queen's University Belfast, Institute of Pathology, Grosvenor Road, Belfast BT12 6BJ, UK
- *Jane McEneny:
| | - Jane-Ann Daniels
- Centre for Public Health, Queen's University Belfast, Institute of Pathology, Grosvenor Road, Belfast BT12 6BJ, UK
| | - Anne McGowan
- Department of Endocrinology, Tallaght Hospital, Dublin 24, Ireland
| | - Anjuli Gunness
- Department of Endocrinology, Tallaght Hospital, Dublin 24, Ireland
| | - Kevin Moore
- Department of Endocrinology, Tallaght Hospital, Dublin 24, Ireland
| | - Michael Stevenson
- Centre for Public Health, Queen's University Belfast, Institute of Pathology, Grosvenor Road, Belfast BT12 6BJ, UK
| | - Ian S. Young
- Centre for Public Health, Queen's University Belfast, Institute of Pathology, Grosvenor Road, Belfast BT12 6BJ, UK
| | - James Gibney
- Department of Endocrinology, Tallaght Hospital, Dublin 24, Ireland
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Thaler R, Sturmlechner I, Spitzer S, Riester SM, Rumpler M, Zwerina J, Klaushofer K, van Wijnen AJ, Varga F. Acute-phase protein serum amyloid A3 is a novel paracrine coupling factor that controls bone homeostasis. FASEB J 2014; 29:1344-59. [PMID: 25491310 DOI: 10.1096/fj.14-265512] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2014] [Accepted: 11/17/2014] [Indexed: 11/11/2022]
Abstract
Serum amyloid A (A-SAA/Saa3) was shown before to affect osteoblastic metabolism. Here, using RT-quantitative PCR and/or immunoblotting, we show that expression of mouse Saa3 and human SAA1 and SAA2 positively correlates with increased cellular maturation toward the osteocyte phenotype. Expression is not detected in C3H10T1/2 embryonic fibroblasts but is successively higher in preosteoblastic MC3T3-E1 cells, late osteoblastic MLO-A5 cells, and MLO-Y4 osteocytes, consistent with findings using primary bone cells from newborn mouse calvaria. Recombinant Saa3 protein functionally inhibits osteoblast differentiation as reflected by reductions in the expression of osteoblast markers and decreased mineralization in newborn mouse calvaria. Yet, Saa3 protein enhances osteoclastogenesis in mouse macrophages/monocytes based on the number of multinucleated and tartrate-resistant alkaline phosphatase-positive cells and Calcr mRNA expression. Depletion of Saa3 in MLO osteocytes results in the loss of the mature osteocyte phenotype. Recombinant osteocalcin, which is reciprocally regulated with Saa3 at the osteoblast/osteocyte transition, attenuates Saa3 expression in MLO-Y4 osteocytes. Mechanistically, Saa3 produced by MLO-Y4 osteocytes is integrated into the extracellular matrix of MC3T3-E1 osteoblasts, where it associates with the P2 purinergic receptor P2rx7 to stimulate Mmp13 expression via the P2rx7/MAPK/ERK/activator protein 1 axis. Our data suggest that Saa3 may function as an important coupling factor in bone development and homeostasis.
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Affiliation(s)
- Roman Thaler
- *Ludwig Boltzmann Institute of Osteology, Wiener Gebietskrankenkasse and Allgemeine Unfallversicherungsanstalt, Trauma Center Meidling, 1st Medical Department, Hanusch Hospital, Vienna, Austria; and Departments of Orthopedic Surgery and Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota, USA
| | - Ines Sturmlechner
- *Ludwig Boltzmann Institute of Osteology, Wiener Gebietskrankenkasse and Allgemeine Unfallversicherungsanstalt, Trauma Center Meidling, 1st Medical Department, Hanusch Hospital, Vienna, Austria; and Departments of Orthopedic Surgery and Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota, USA
| | - Silvia Spitzer
- *Ludwig Boltzmann Institute of Osteology, Wiener Gebietskrankenkasse and Allgemeine Unfallversicherungsanstalt, Trauma Center Meidling, 1st Medical Department, Hanusch Hospital, Vienna, Austria; and Departments of Orthopedic Surgery and Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota, USA
| | - Scott M Riester
- *Ludwig Boltzmann Institute of Osteology, Wiener Gebietskrankenkasse and Allgemeine Unfallversicherungsanstalt, Trauma Center Meidling, 1st Medical Department, Hanusch Hospital, Vienna, Austria; and Departments of Orthopedic Surgery and Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota, USA
| | - Monika Rumpler
- *Ludwig Boltzmann Institute of Osteology, Wiener Gebietskrankenkasse and Allgemeine Unfallversicherungsanstalt, Trauma Center Meidling, 1st Medical Department, Hanusch Hospital, Vienna, Austria; and Departments of Orthopedic Surgery and Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota, USA
| | - Jochen Zwerina
- *Ludwig Boltzmann Institute of Osteology, Wiener Gebietskrankenkasse and Allgemeine Unfallversicherungsanstalt, Trauma Center Meidling, 1st Medical Department, Hanusch Hospital, Vienna, Austria; and Departments of Orthopedic Surgery and Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota, USA
| | - Klaus Klaushofer
- *Ludwig Boltzmann Institute of Osteology, Wiener Gebietskrankenkasse and Allgemeine Unfallversicherungsanstalt, Trauma Center Meidling, 1st Medical Department, Hanusch Hospital, Vienna, Austria; and Departments of Orthopedic Surgery and Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota, USA
| | - Andre J van Wijnen
- *Ludwig Boltzmann Institute of Osteology, Wiener Gebietskrankenkasse and Allgemeine Unfallversicherungsanstalt, Trauma Center Meidling, 1st Medical Department, Hanusch Hospital, Vienna, Austria; and Departments of Orthopedic Surgery and Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota, USA
| | - Franz Varga
- *Ludwig Boltzmann Institute of Osteology, Wiener Gebietskrankenkasse and Allgemeine Unfallversicherungsanstalt, Trauma Center Meidling, 1st Medical Department, Hanusch Hospital, Vienna, Austria; and Departments of Orthopedic Surgery and Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota, USA
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Deletion of serum amyloid A3 improves high fat high sucrose diet-induced adipose tissue inflammation and hyperlipidemia in female mice. PLoS One 2014; 9:e108564. [PMID: 25251243 PMCID: PMC4177399 DOI: 10.1371/journal.pone.0108564] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2014] [Accepted: 08/22/2014] [Indexed: 12/17/2022] Open
Abstract
Serum amyloid A (SAA) increases in response to acute inflammatory stimuli and is modestly and chronically elevated in obesity. SAA3, an inducible form of SAA, is highly expressed in adipose tissue in obese mice where it promotes monocyte chemotaxis, providing a mechanism for the macrophage accumulation that occurs with adipose tissue expansion in obesity. Humans do not express functional SAA3 protein, but instead express SAA1 and SAA2 in hepatic as well as extrahepatic tissues, making it difficult to distinguish between liver and adipose tissue-specific SAA effects. SAA3 does not circulate in plasma, but may exert local effects that impact systemic inflammation. We tested the hypothesis that SAA3 contributes to chronic systemic inflammation and adipose tissue macrophage accumulation in obesity using mice deficient for Saa3 (Saa3(-/-)). Mice were rendered obese by feeding a pro-inflammatory high fat, high sucrose diet with added cholesterol (HFHSC). Both male and female Saa3(-/-) mice gained less weight on the HFHSC diet compared to Saa3(+/+) littermate controls, with no differences in body composition or resting metabolism. Female Saa3(-/-) mice, but not males, had reduced HFHSC diet-induced adipose tissue inflammation and macrophage content. Both male and female Saa3(-/-) mice had reduced liver Saa1 and Saa2 expression in association with reduced plasma SAA. Additionally, female Saa3(-/-) mice, but not males, showed improved plasma cholesterol, triglycerides, and lipoprotein profiles, with no changes in glucose metabolism. Taken together, these results suggest that the absence of Saa3 attenuates liver-specific SAA (i.e., SAA1/2) secretion into plasma and blunts weight gain induced by an obesogenic diet. Furthermore, adipose tissue-specific inflammation and macrophage accumulation are attenuated in female Saa3(-/-) mice, suggesting a novel sexually dimorphic role for this protein. These results also suggest that Saa3 influences liver-specific SAA1/2 expression, and that SAA3 could play a larger role in the acute phase response than previously thought.
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Derebe MG, Zlatkov CM, Gattu S, Ruhn KA, Vaishnava S, Diehl GE, MacMillan JB, Williams NS, Hooper LV. Serum amyloid A is a retinol binding protein that transports retinol during bacterial infection. eLife 2014; 3:e03206. [PMID: 25073702 PMCID: PMC4129439 DOI: 10.7554/elife.03206] [Citation(s) in RCA: 92] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Retinol plays a vital role in the immune response to infection, yet proteins that mediate retinol transport during infection have not been identified. Serum amyloid A (SAA) proteins are strongly induced in the liver by systemic infection and in the intestine by bacterial colonization, but their exact functions remain unclear. Here we show that mouse and human SAAs are retinol binding proteins. Mouse and human SAAs bound retinol with nanomolar affinity, were associated with retinol in vivo, and limited the bacterial burden in tissues after acute infection. We determined the crystal structure of mouse SAA3 at a resolution of 2 Å, finding that it forms a tetramer with a hydrophobic binding pocket that can accommodate retinol. Our results thus identify SAAs as a family of microbe-inducible retinol binding proteins, reveal a unique protein architecture involved in retinol binding, and suggest how retinol is circulated during infection. DOI:http://dx.doi.org/10.7554/eLife.03206.001 Vitamins are nutrients that organisms require in order to survive and grow. If an organism is unable to synthesize a vitamin in sufficient quantities, it is essential that it obtain the vitamin through its diet instead. Vitamin A is found in foods such as eggs, animal liver and carrots, and a diet that is lacking in this vitamin can cause blindness and an increased risk of microbial infections. Vitamin A is not a single compound, but rather a collection of compounds with similar molecular structures. One of these is retinol, which plays a vital role in the body's response to microbial infection. Retinol must bind to specific proteins to be able to move through the bloodstream and be transported around the body. Serum retinol binding protein transports ingested retinol from the intestine to the liver and other tissues. However, during microbial infection—when retinol transport is particularly important—the amount of this protein dramatically decreases; as such it is unclear how retinol is transported when the body is under attack from pathogens. It had been suggested that Serum Amyloid A (SAA) proteins, a family of proteins made by some liver and intestinal cells, could be involved in the response to infection, because these proteins' levels increase during infection. However, their exact functions were unknown. Derebe, Zlatkov et al. found that mice fed a diet poor in vitamin A produced fewer SAA proteins in their liver and intestinal cells. However, treating the cells with retinol or the molecule it is broken down into—called retinoic acid—caused more SAAs to be made. Derebe, Zlatkov et al. also discovered that SAAs are associated with retinol in blood samples taken from mice infected with salmonella; and that both mouse and human SAAs bind tightly to retinol. Combined, this evidence suggests that SAAs are the retinol binding proteins that transport retinol during infections. Derebe, Zlatkov et al. went on to solve the crystal structure of a mouse SAA protein, and showed that four SAA molecules bind together to form a ‘pocket’ that can hold a retinol molecule. Future work will focus on understanding exactly how the transport of retinol by SAAs affects the development of immunity to infections. DOI:http://dx.doi.org/10.7554/eLife.03206.002
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Affiliation(s)
- Mehabaw G Derebe
- Department of Immunology, University of Texas Southwestern Medical Center, Dallas, United States
| | - Clare M Zlatkov
- Department of Immunology, University of Texas Southwestern Medical Center, Dallas, United States
| | - Sureka Gattu
- Department of Immunology, University of Texas Southwestern Medical Center, Dallas, United States
| | - Kelly A Ruhn
- Department of Immunology, University of Texas Southwestern Medical Center, Dallas, United States
| | - Shipra Vaishnava
- Department of Immunology, University of Texas Southwestern Medical Center, Dallas, United States
| | - Gretchen E Diehl
- Molecular Pathogenesis Program, The Kimmel Center for Biology and Medicine of the Skirball Institute, New York University School of Medicine, New York, United States
| | - John B MacMillan
- Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, United States
| | - Noelle S Williams
- Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, United States
| | - Lora V Hooper
- Department of Immunology, University of Texas Southwestern Medical Center, Dallas, United States Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, Dallas, United States
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Saber AT, Jacobsen NR, Jackson P, Poulsen SS, Kyjovska ZO, Halappanavar S, Yauk CL, Wallin H, Vogel U. Particle-induced pulmonary acute phase response may be the causal link between particle inhalation and cardiovascular disease. WILEY INTERDISCIPLINARY REVIEWS-NANOMEDICINE AND NANOBIOTECHNOLOGY 2014; 6:517-31. [PMID: 24920450 PMCID: PMC4285160 DOI: 10.1002/wnan.1279] [Citation(s) in RCA: 83] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/06/2014] [Revised: 05/14/2014] [Accepted: 05/20/2014] [Indexed: 01/08/2023]
Abstract
Inhalation of ambient and workplace particulate air pollution is associated with increased risk of cardiovascular disease. One proposed mechanism for this association is that pulmonary inflammation induces a hepatic acute phase response, which increases risk of cardiovascular disease. Induction of the acute phase response is intimately linked to risk of cardiovascular disease as shown in both epidemiological and animal studies. Indeed, blood levels of acute phase proteins, such as C-reactive protein and serum amyloid A, are independent predictors of risk of cardiovascular disease in prospective epidemiological studies. In this review, we present and review emerging evidence that inhalation of particles (e.g., air diesel exhaust particles and nanoparticles) induces a pulmonary acute phase response, and propose that this induction constitutes the causal link between particle inhalation and risk of cardiovascular disease. Increased levels of acute phase mRNA and proteins in lung tissues, bronchoalveolar lavage fluid and plasma clearly indicate pulmonary acute phase response following pulmonary deposition of different kinds of particles including diesel exhaust particles, nanoparticles, and carbon nanotubes. The pulmonary acute phase response is dose-dependent and long lasting. Conversely, the hepatic acute phase response is reduced relative to lung or entirely absent. We also provide evidence that pulmonary inflammation, as measured by neutrophil influx, is a predictor of the acute phase response and that the total surface area of deposited particles correlates with the pulmonary acute phase response. We discuss the implications of these findings in relation to occupational exposure to nanoparticles. How to cite this article: WIREs Nanomed Nanobiotechnol 2014, 6:517–531. doi: 10.1002/wnan.1279
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Affiliation(s)
- Anne T Saber
- National Research Centre for the Working Environment, Copenhagen, Denmark
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Shigemura H, Ishiguro N, Inoshima Y. Up-regulation of MUC2 mucin expression by serum amyloid A3 protein in mouse colonic epithelial cells. J Vet Med Sci 2014; 76:985-91. [PMID: 24694941 PMCID: PMC4143660 DOI: 10.1292/jvms.14-0007] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Serum amyloid A (SAA) proteins
are acute-phase proteins and are classified into multiple isoforms; however, the
biological functions of each SAA isoform are not fully understood. In this study, to
clarify the roles of SAA3 in the intestine, we characterized mRNA expression in mouse
colonic epithelial CMT-93 cells treated with rotavirus, Toxoplasma,
Staphylococcus aureus, and Escherichia coli, as well
as lipopolysaccharide (LPS) and recombinant murine SAAs (rSAAs). E. coli
together with LPS, but not the other pathogens, enhanced SAA3 mRNA expression. The mRNA
expression of SAA3 by dead E. coli was higher than that by living
E. coli, and the mRNA expression by E. coli and LPS
increased in a dose-dependent manner. In contrast, mRNA expressions of SAA1 and/or SAA2
were not stimulated by any of the treatments. In comparisons of cell treatments with rSAA1
or rSAA3, rSAA3 significantly up-regulated the mRNA expression of mucin 2 (MUC2), a major
component of the mucus layer of the intestines that acts as an epithelial cell barrier
against pathogens, while MUC2 mRNA expression was not significantly increased by
E. coli and LPS. Furthermore, treatment with rSAAs intensively induced
tumor necrosis factor-α mRNA expression. These results suggest that SAA3 plays a role in
host innate immunity in the colon by up-regulating MUC2 mucin production, which builds a
physiological barrier of colonic epithelia against bacterial invasion.
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Affiliation(s)
- Hiroaki Shigemura
- Laboratory of Food and Environmental Hygiene, Cooperative Department of Veterinary Medicine, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
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Saremi B, Mielenz M, Rahman M, Hosseini A, Kopp C, Dänicke S, Ceciliani F, Sauerwein H. Hepatic and extrahepatic expression of serum amyloid A3 during lactation in dairy cows. J Dairy Sci 2013; 96:6944-6954. [DOI: 10.3168/jds.2013-6495] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2012] [Accepted: 08/07/2013] [Indexed: 01/03/2023]
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Olsen HG, Skovgaard K, Nielsen OL, Leifsson PS, Jensen HE, Iburg T, Heegaard PMH. Organization and biology of the porcine serum amyloid A (SAA) gene cluster: isoform specific responses to bacterial infection. PLoS One 2013; 8:e76695. [PMID: 24146912 PMCID: PMC3795699 DOI: 10.1371/journal.pone.0076695] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2013] [Accepted: 08/27/2013] [Indexed: 12/16/2022] Open
Abstract
Serum amyloid A (SAA) is a prominent acute phase protein. Although its biological functions are debated, the wide species distribution of highly homologous SAA proteins and their uniform behavior in response to injury or inflammation in itself suggests a significant role for this protein. The pig is increasingly being used as a model for the study of inflammatory reactions, yet only little is known about how specific SAA genes are regulated in the pig during acute phase responses and other responses induced by pro-inflammatory host mediators. We designed SAA gene specific primers and quantified the gene expression of porcine SAA1, SAA2, SAA3, and SAA4 by reverse transcriptase quantitative polymerase chain reaction (RT-qPCR) in liver, spleen, and lung tissue from pigs experimentally infected with the Gram-negative swine specific bacterium Actinobacillus pleuropneumoniae, as well as from pigs experimentally infected with the Gram-positive bacterium Staphylococcus aureus. Our results show that: 1) SAA1 may be a pseudogene in pigs; 2) we were able to detect two previously uncharacterized SAA transcripts, namely SAA2 and SAA4, of which the SAA2 transcript is primarily induced in the liver during acute infection and presumably contributes to circulating SAA in pigs; 3) Porcine SAA3 transcription is induced both hepatically and extrahepatically during acute infection, and may be correlated to local organ affection; 4) Hepatic transcription of SAA4 is markedly induced in pigs infected with A. pleuropneumoniae, but only weakly in pigs infected with S. aureus. These results for the first time establish the infection response patterns of the four porcine SAA genes which will be of importance for the use of the pig as a model for human inflammatory responses, e.g. within sepsis, cancer, and obesity research.
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Affiliation(s)
- Helle G. Olsen
- Department of Veterinary Disease Biology, Faculty of Health and Medical Sciences, University of Copenhagen, Frederiksberg, Denmark
| | - Kerstin Skovgaard
- Innate Immunology Group, National Veterinary Institute, Technical University of Denmark, Frederiksberg, Denmark
| | - Ole L. Nielsen
- Department of Veterinary Disease Biology, Faculty of Health and Medical Sciences, University of Copenhagen, Frederiksberg, Denmark
| | - Páll S. Leifsson
- Department of Veterinary Disease Biology, Faculty of Health and Medical Sciences, University of Copenhagen, Frederiksberg, Denmark
| | - Henrik E. Jensen
- Department of Veterinary Disease Biology, Faculty of Health and Medical Sciences, University of Copenhagen, Frederiksberg, Denmark
| | - Tine Iburg
- Department of Veterinary Disease Biology, Faculty of Health and Medical Sciences, University of Copenhagen, Frederiksberg, Denmark
| | - Peter M. H. Heegaard
- Innate Immunology Group, National Veterinary Institute, Technical University of Denmark, Frederiksberg, Denmark
- * E-mail:
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Koscsó B, Csóka B, Kókai E, Németh ZH, Pacher P, Virág L, Leibovich SJ, Haskó G. Adenosine augments IL-10-induced STAT3 signaling in M2c macrophages. J Leukoc Biol 2013; 94:1309-15. [PMID: 23922379 DOI: 10.1189/jlb.0113043] [Citation(s) in RCA: 110] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
The alternatively activated macrophage phenotype induced by IL-10 is called M2c. Adenosine is an endogenous purine nucleoside that accumulates in the extracellular space in response to metabolic disturbances, hypoxia, inflammation, physical damage, or apoptosis. As adenosine is known to regulate classically activated M1 and IL4- and IL-13-activated M2a macrophages, the goal of the present study was to explore its effects on M2c macrophages. We found that adenosine augmented the IL-10-induced expression of TIMP-1 and arginase-1 by the mouse macrophage cell line RAW 264.7 and by mouse BMDMs. The effects of AR stimulation on IL-10-induced TIMP-1 or arginase-1 expression were lacking in A2BAR KO macrophages. The role of A2BAR on TIMP-1 production of RAW 264.7 cells was confirmed with specific agonist BAY606583 and antagonist PSB0788. AR stimulation augmented IL-10-induced STAT3 phosphorylation in macrophages, and pharmacological inhibition or silencing of STAT3 using siRNA reduced the stimulatory effect of AR stimulation on TIMP-1 production. In contrast to its stimulatory effect on IL-10-induced STAT3 activation, adenosine inhibited IL-6-induced STAT3 phosphorylation and SAA3 expression. In conclusion, adenosine enhances IL-10-induced STAT3 signaling and M2c macrophage activation.
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Affiliation(s)
- Balázs Koscsó
- 1.Rutgers New Jersey Medical School, 185 South Orange Ave., University Heights, Newark, NJ 07103, USA.
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