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Pavel V, Räth U, Schmid S, Krautbauer S, Keller D, Amend P, Müller M, Mester P, Buechler C. Serum Adiponectin Predicts COVID-19 Severity. Biomedicines 2024; 12:1043. [PMID: 38791005 PMCID: PMC11117573 DOI: 10.3390/biomedicines12051043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2024] [Revised: 05/02/2024] [Accepted: 05/08/2024] [Indexed: 05/26/2024] Open
Abstract
Adiponectin is primarily known for its protective role in metabolic diseases, and it also possesses immunoregulatory properties. Elevated levels of adiponectin have been observed in various inflammatory diseases. However, studies investigating adiponectin levels in the serum of COVID-19 patients have yielded conflicting results. This study aimed to assess serum adiponectin levels in 26 healthy controls, as well as in 64 patients with moderate and 60 patients with severe COVID-19, to determine a potential association between serum adiponectin and the severity of COVID-19. Serum adiponectin levels in severe COVID-19 patients were significantly lower than in those with moderate disease and healthy controls, who exhibited similar serum adiponectin levels. Among patients with moderate disease, positive correlations were observed between serum adiponectin and C-reactive protein levels. Of note, serum adiponectin levels of severe COVID-19 cases were comparable between patients with and without dialysis or vasopressor therapy. Superinfection with bacteria did not exert a notable influence on serum adiponectin levels in patients with severe disease. Patients who were diagnosed with severe COVID-19 and vancomycin-resistant enterococci bacteremia showed a significant reduction in their serum adiponectin levels. An analysis conducted on the entire cohort, including both moderate and severe COVID-19 patients, showed that individuals who did not survive had lower serum adiponectin levels when compared to those who survived. In summary, this study highlights a decrease in serum adiponectin levels in severe COVID-19 cases, indicating the potential utility of adiponectin as an additional biomarker for monitoring disease severity in COVID-19 or critical illnesses in general.
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Affiliation(s)
- Vlad Pavel
- Department of Internal Medicine I, Gastroenterology, Hepatology, Endocrinology, Rheumatology, and Infectious Diseases, University Hospital Regensburg, 93053 Regensburg, Germany; (V.P.); (U.R.); (S.S.); (D.K.); (P.A.); (M.M.); (P.M.)
| | - Ulrich Räth
- Department of Internal Medicine I, Gastroenterology, Hepatology, Endocrinology, Rheumatology, and Infectious Diseases, University Hospital Regensburg, 93053 Regensburg, Germany; (V.P.); (U.R.); (S.S.); (D.K.); (P.A.); (M.M.); (P.M.)
| | - Stephan Schmid
- Department of Internal Medicine I, Gastroenterology, Hepatology, Endocrinology, Rheumatology, and Infectious Diseases, University Hospital Regensburg, 93053 Regensburg, Germany; (V.P.); (U.R.); (S.S.); (D.K.); (P.A.); (M.M.); (P.M.)
| | - Sabrina Krautbauer
- Institute of Clinical Chemistry and Laboratory Medicine, University Hospital Regensburg, 93053 Regensburg, Germany;
| | - Dennis Keller
- Department of Internal Medicine I, Gastroenterology, Hepatology, Endocrinology, Rheumatology, and Infectious Diseases, University Hospital Regensburg, 93053 Regensburg, Germany; (V.P.); (U.R.); (S.S.); (D.K.); (P.A.); (M.M.); (P.M.)
| | - Pablo Amend
- Department of Internal Medicine I, Gastroenterology, Hepatology, Endocrinology, Rheumatology, and Infectious Diseases, University Hospital Regensburg, 93053 Regensburg, Germany; (V.P.); (U.R.); (S.S.); (D.K.); (P.A.); (M.M.); (P.M.)
| | - Martina Müller
- Department of Internal Medicine I, Gastroenterology, Hepatology, Endocrinology, Rheumatology, and Infectious Diseases, University Hospital Regensburg, 93053 Regensburg, Germany; (V.P.); (U.R.); (S.S.); (D.K.); (P.A.); (M.M.); (P.M.)
| | - Patricia Mester
- Department of Internal Medicine I, Gastroenterology, Hepatology, Endocrinology, Rheumatology, and Infectious Diseases, University Hospital Regensburg, 93053 Regensburg, Germany; (V.P.); (U.R.); (S.S.); (D.K.); (P.A.); (M.M.); (P.M.)
| | - Christa Buechler
- Department of Internal Medicine I, Gastroenterology, Hepatology, Endocrinology, Rheumatology, and Infectious Diseases, University Hospital Regensburg, 93053 Regensburg, Germany; (V.P.); (U.R.); (S.S.); (D.K.); (P.A.); (M.M.); (P.M.)
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Barthelemy J, Bogard G, Wolowczuk I. Beyond energy balance regulation: The underestimated role of adipose tissues in host defense against pathogens. Front Immunol 2023; 14:1083191. [PMID: 36936928 PMCID: PMC10019896 DOI: 10.3389/fimmu.2023.1083191] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Accepted: 01/09/2023] [Indexed: 03/06/2023] Open
Abstract
Although the adipose tissue (AT) is a central metabolic organ in the regulation of whole-body energy homeostasis, it is also an important endocrine and immunological organ. As an endocrine organ, AT secretes a variety of bioactive peptides known as adipokines - some of which have inflammatory and immunoregulatory properties. As an immunological organ, AT contains a broad spectrum of innate and adaptive immune cells that have mostly been studied in the context of obesity. However, overwhelming evidence supports the notion that AT is a genuine immunological effector site, which contains all cell subsets required to induce and generate specific and effective immune responses against pathogens. Indeed, AT was reported to be an immune reservoir in the host's response to infection, and a site of parasitic, bacterial and viral infections. In addition, besides AT's immune cells, preadipocytes and adipocytes were shown to express innate immune receptors, and adipocytes were reported as antigen-presenting cells to regulate T-cell-mediated adaptive immunity. Here we review the current knowledge on the role of AT and AT's immune system in host defense against pathogens. First, we will summarize the main characteristics of AT: type, distribution, function, and extraordinary plasticity. Second, we will describe the intimate contact AT has with lymph nodes and vessels, and AT immune cell composition. Finally, we will present a comprehensive and up-to-date overview of the current research on the contribution of AT to host defense against pathogens, including the respiratory viruses influenza and SARS-CoV-2.
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Affiliation(s)
| | | | - Isabelle Wolowczuk
- Univ. Lille, Centre National de la Recherche Scientifique (CNRS), Institut National de la Santé et de la Recherche Médicale (Inserm), Centre Hospitalier Universitaire de Lille (CHU Lille), Institut Pasteur de Lille, U1019 - UMR 9017 - Center for Infection and Immunity of Lille (CIIL), Lille, France
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3
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Shi J, Li W, Zhang F, Park JH, An H, Guo S, Duan Y, Wu D, Hayakawa K, Lo EH, Ji X. CCL2 (C-C Motif Chemokine Ligand 2) Biomarker Responses in Central Versus Peripheral Compartments After Focal Cerebral Ischemia. Stroke 2021; 52:3670-3679. [PMID: 34587791 PMCID: PMC8545911 DOI: 10.1161/strokeaha.120.032782] [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] [Indexed: 12/24/2022]
Abstract
Background and Purpose Inflammatory mediators in blood have been proposed as potential biomarkers in stroke. However, a direct relationship between these circulating factors and brain-specific ischemic injury remains to be fully defined. Methods An unbiased screen in a nonhuman primate model of stroke was used to find out the most responsive circulating biomarker flowing ischemic stroke. Then this phenomenon was checked in human beings and mice. Finally, we observed the temporospatial responsive characteristics of this biomarker after ischemic brain injury in mice to evaluate the direct relationship between this circulating factor and central nervous system–specific ischemic injury. Results In a nonhuman primate model, an unbiased screen revealed CCL2 (C-C motif chemokine ligand 2) as a major response factor in plasma after stroke. In mouse models of focal cerebral ischemia, plasma levels of CCL2 showed a transient response, that is, rapidly elevated by 2 to 3 hours postischemia but then renormalized back to baseline levels by 24 hours. However, a different CCL2 temporal profile was observed in whole brain homogenate, cerebrospinal fluid, and isolated brain microvessels, with a progressive increase over 24 hours, demonstrating a mismatch between brain versus plasma responses. In contrast to the lack of correlation with central nervous system responses, 2 peripheral compartments showed transient profiles that matched circulating plasma signatures. CCL2 protein in lymph nodes and adipose tissue was significantly increased at 2 hours and renormalized by 24 hours. Conclusions These findings may provide a cautionary tale for biomarker pursuits in plasma. Besides a direct central nervous system response, peripheral organs may also contribute to blood signatures in complex and indirect ways.
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Affiliation(s)
- Jingfei Shi
- Cerebrovascular and Neuroscience Research Institute, Xuanwu Hospital, Capital Medical University, Beijing, China.,Neuroprotection Research Laboratories, Departments of Neurology and Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Wenlu Li
- Neuroprotection Research Laboratories, Departments of Neurology and Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Fang Zhang
- Neuroprotection Research Laboratories, Departments of Neurology and Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Ji Hyun Park
- Neuroprotection Research Laboratories, Departments of Neurology and Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Hong An
- Cerebrovascular and Neuroscience Research Institute, Xuanwu Hospital, Capital Medical University, Beijing, China.,Neuroprotection Research Laboratories, Departments of Neurology and Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Shuzhen Guo
- Neuroprotection Research Laboratories, Departments of Neurology and Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Yunxia Duan
- Cerebrovascular and Neuroscience Research Institute, Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Di Wu
- Cerebrovascular and Neuroscience Research Institute, Xuanwu Hospital, Capital Medical University, Beijing, China.,Neuroprotection Research Laboratories, Departments of Neurology and Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Kazuhide Hayakawa
- Neuroprotection Research Laboratories, Departments of Neurology and Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Eng H. Lo
- Neuroprotection Research Laboratories, Departments of Neurology and Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Xunming Ji
- Cerebrovascular and Neuroscience Research Institute, Xuanwu Hospital, Capital Medical University, Beijing, China.,Departments of Neurosurgery, Xuanwu Hospital, Capital Medical University, Beijing, China.,Beijing Institute of Brain Disorders, Collaborative Innovation Center for Brain Disorders, Capital Medical University, Beijing, China
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4
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Zhang K, Tai Z, Han Q, Pang Y, Li Q. Adiponectin as inducer of inflammatory and apoptosis involving in immune defense in lamprey. FISH & SHELLFISH IMMUNOLOGY 2019; 90:446-455. [PMID: 31002928 DOI: 10.1016/j.fsi.2019.04.045] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Revised: 04/10/2019] [Accepted: 04/11/2019] [Indexed: 06/09/2023]
Abstract
Adiponectin (APN) is an important cytokine secreted by fat cells that is responsible for regulating numerous biological functions. However, the APN gene in lamprey and its precise function remain unidentified. In this study, the full-length cDNA sequence of L-APN was cloned, and it encoded a protein of 267 amino acid residues with a globular domain. The results of immunohistochemistry and FACS assays showed that APN protein was distributed in multiple tissues. L-APN expression in the supraneural body (SB) and leukocytes was differentially upregulated in response to Gram-negative bacteria, Gram-positive bacteria and poly (I:C). The expression levels of inflammatory cytokines were upregulated, and a proapoptotic effect was stimulated in SB cells treated with recombinant APN. Furthermore, L-APN could inhibit cell proliferation and arrest cell growth in the G1 phase. In summary, the APN protein from the lamprey plays an important role in inhibiting cell proliferation, inducing the production of inflammatory cytokines and promoting cell apoptosis, and it is also involved in immune responses and immune defenses. Our data provide insights into the evolutionary origin of the structure and function of APN gene.
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Affiliation(s)
- Kejia Zhang
- College of Life Science, Liaoning Normal University, Dalian, 116081, China; Lamprey Research Center, Liaoning Normal University, Dalian, 116081, China
| | - Zhao Tai
- College of Life Science, Liaoning Normal University, Dalian, 116081, China; Lamprey Research Center, Liaoning Normal University, Dalian, 116081, China
| | - Qing Han
- College of Life Science, Liaoning Normal University, Dalian, 116081, China; Lamprey Research Center, Liaoning Normal University, Dalian, 116081, China
| | - Yue Pang
- College of Life Science, Liaoning Normal University, Dalian, 116081, China; Lamprey Research Center, Liaoning Normal University, Dalian, 116081, China.
| | - Qingwei Li
- College of Life Science, Liaoning Normal University, Dalian, 116081, China; Lamprey Research Center, Liaoning Normal University, Dalian, 116081, China.
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5
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Liu H, Lu XJ, Chen J. Full-length and a smaller globular fragment of adiponectin have opposite roles in regulating monocyte/macrophage functions in ayu, Plecoglossus altivelis. FISH & SHELLFISH IMMUNOLOGY 2018; 82:319-329. [PMID: 30130657 DOI: 10.1016/j.fsi.2018.08.041] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2018] [Revised: 08/17/2018] [Accepted: 08/18/2018] [Indexed: 06/08/2023]
Abstract
Adiponectin (ADP), a regulator of the innate immune system, plays a role in the progression of inflammation and metabolic disorders in mammals. However, the role of ADP in fish is poorly understood. Here, we cloned the cDNA sequence of a ADP homolog (PaADP) gene from ayu. Multiple sequence alignment revealed that PaADP presented typical characteristics of ADPs. Phylogenetic tree analysis showed that PaADP was most closely related to that of rainbow trout. In healthy ayu, the transcripts of PaADP were detected in most of the tested tissues and cells, with the highest level in the adipose tissue. Upon V. anguillarum infection, the mRNA expression of PaADP was significantly up-regulated in the tissues and cells except adipose tissue. Subsequently, the full-length mature PaADP (fPaADP) and the globular domain fragment (gPaADP) were prokaryotically expressed in bacteria and purified, and anti-PaADP antibodies were produced. Western blot analysis revealed that three fragments including fPaADP and gPaADP were existed in ayu serum. The recombinant fPaADP (rfPaADP) had an anti-inflammatory effect on ayu MO/MФ by upregulating anti-inflammatory cytokine expressions, downregulating pro-inflammatory cytokine expressions, inhibiting the phagocytosis and subsequent bacterial killing. In contrast, the recombinant gPaADP (rgPaADP) presented a pro-inflammatory effect on ayu MO/MФ by upregulating pro-inflammatory cytokine expression, downregulating anti-inflammatory cytokine expressions, enhancing the phagocytosis and subsequent bacterial killing. These results suggested that fPaADP and gPaADP have opposite roles in the regulation of MO/MФ functions in ayu.
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Affiliation(s)
- He Liu
- Laboratory of Biochemistry and Molecular Biology, School of Marine Sciences, Ningbo University, Ningbo 315211, China
| | - Xin-Jiang Lu
- Laboratory of Biochemistry and Molecular Biology, School of Marine Sciences, Ningbo University, Ningbo 315211, China
| | - Jiong Chen
- Laboratory of Biochemistry and Molecular Biology, School of Marine Sciences, Ningbo University, Ningbo 315211, China; Key Laboratory of Applied Marine Biotechnology of Ministry of Education, Ningbo University, Ningbo 315211, China.
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6
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Nakane A. [Host responses to bacterial infections]. Nihon Saikingaku Zasshi 2014; 69:479-89. [PMID: 25186639 DOI: 10.3412/jsb.69.479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Pathogenic bacteria and host defense system have been evolved by their offense and defense. In vivo research is crucial for elucidation of interactions between them. I have investigated their offence and defense by various standpoints using mouse models of Listeria monocytogenes and Staphylococcus aureus infections. Herein, the results of my research including the roles of endogenous cytokines in host defense, the attenuation of host defense mechanism in obesity and diabetes, the development of vaccines against S. aureus infection by staphylococcal enterotoxin (SE) family molecules, and the emesis-inducing mechanism of SEA are described.
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Affiliation(s)
- Akio Nakane
- Department of Microbiology and Immunology, Hirosaki University Graduate School of Medicine
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7
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Bechah Y, Verneau J, Ben Amara A, Barry AO, Lépolard C, Achard V, Panicot-Dubois L, Textoris J, Capo C, Ghigo E, Mege JL. Persistence of Coxiella burnetii, the agent of Q fever, in murine adipose tissue. PLoS One 2014; 9:e97503. [PMID: 24835240 PMCID: PMC4023977 DOI: 10.1371/journal.pone.0097503] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2013] [Accepted: 04/17/2014] [Indexed: 12/12/2022] Open
Abstract
Coxiella burnetii, the agent of Q fever, is known to persist in humans and rodents but its cellular reservoir in hosts remains undetermined. We hypothesized that adipose tissue serves as a C. burnetii reservoir during bacterial latency. BALB/c and C57BL/6 mice were infected with C. burnetii by the intraperitoneal route or the intracheal route. Adipose tissue was tested for the presence of C. burnetii several months after infection. C. burnetii was detected in abdominal, inguinal and dorsal adipose tissue 4 months post-infection, when no bacteria were detected in blood, liver, lungs and spleen, regardless of the inoculation route and independently of mouse strain. The transfer of abdominal adipose tissue from convalescent BALB/c mice to naïve immunodeficient mice resulted in the infection of the recipient animals. It is likely that C. burnetii infects adipocytes in vivo because bacteria were found in adipocytes within adipose tissue and replicated within in vitro-differentiated adipocytes. In addition, C. burnetii induced a specific transcriptional program in in-vivo and in vitro-differentiated adipocytes, which was enriched in categories associated with inflammatory response, hormone response and cytoskeleton. These changes may account for bacterial replication in in-vitro and chronic infection in-vivo. Adipose tissue may be the reservoir in which C. burnetii persists for prolonged periods after apparent clinical cure. The mouse model of C. burnetii infection may be used to understand the relapses of Q fever and provide new perspectives to the follow-up of patients.
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Affiliation(s)
- Yassina Bechah
- Unité de Recherche sur les Maladies Infectieuses Transmissibles et Emergentes, Aix-Marseille Université, UMR CNRS 7278, IRD 198, INSERM U1095, Marseille, France
- * E-mail:
| | - Johanna Verneau
- Unité de Recherche sur les Maladies Infectieuses Transmissibles et Emergentes, Aix-Marseille Université, UMR CNRS 7278, IRD 198, INSERM U1095, Marseille, France
| | - Amira Ben Amara
- Unité de Recherche sur les Maladies Infectieuses Transmissibles et Emergentes, Aix-Marseille Université, UMR CNRS 7278, IRD 198, INSERM U1095, Marseille, France
| | - Abdoulaye O. Barry
- Unité de Recherche sur les Maladies Infectieuses Transmissibles et Emergentes, Aix-Marseille Université, UMR CNRS 7278, IRD 198, INSERM U1095, Marseille, France
| | - Catherine Lépolard
- Unité de Recherche sur les Maladies Infectieuses Transmissibles et Emergentes, Aix-Marseille Université, UMR CNRS 7278, IRD 198, INSERM U1095, Marseille, France
| | - Vincent Achard
- Nutrition, Obésité et Risque Thrombotique, Aix-Marseille Université, UMR_S INSERM, Marseille, France
| | - Laurence Panicot-Dubois
- Aix-Marseille Université UMR-S1076, Endothélium, Pathologies Vasculaires et Cibles Thérapeutiques, Marseille, France
| | - Julien Textoris
- Unité de Recherche sur les Maladies Infectieuses Transmissibles et Emergentes, Aix-Marseille Université, UMR CNRS 7278, IRD 198, INSERM U1095, Marseille, France
| | - Christian Capo
- Unité de Recherche sur les Maladies Infectieuses Transmissibles et Emergentes, Aix-Marseille Université, UMR CNRS 7278, IRD 198, INSERM U1095, Marseille, France
| | - Eric Ghigo
- Unité de Recherche sur les Maladies Infectieuses Transmissibles et Emergentes, Aix-Marseille Université, UMR CNRS 7278, IRD 198, INSERM U1095, Marseille, France
| | - Jean-Louis Mege
- Unité de Recherche sur les Maladies Infectieuses Transmissibles et Emergentes, Aix-Marseille Université, UMR CNRS 7278, IRD 198, INSERM U1095, Marseille, France
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Masternak MM, Bartke A. Growth hormone, inflammation and aging. PATHOBIOLOGY OF AGING & AGE RELATED DISEASES 2012; 2:PBA-2-17293. [PMID: 22953033 PMCID: PMC3417471 DOI: 10.3402/pba.v2i0.17293] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 01/31/2012] [Revised: 02/27/2012] [Accepted: 03/01/2012] [Indexed: 01/26/2023]
Abstract
Mutant animals characterized by extended longevity provide valuable tools to study the mechanisms of aging. Growth hormone and insulin-like growth factor-1 (IGF-1) constitute one of the well-established pathways involved in the regulation of aging and lifespan. Ames and Snell dwarf mice characterized by GH deficiency as well as growth hormone receptor/growth hormone binding protein knockout (GHRKO) mice characterized by GH resistance live significantly longer than genetically normal animals. During normal aging of rodents and humans there is increased insulin resistance, disruption of metabolic activities and decline of the function of the immune system. All of these age related processes promote inflammatory activity, causing long term tissue damage and systemic chronic inflammation. However, studies of long living mutants and calorie restricted animals show decreased pro-inflammatory activity with increased levels of anti-inflammatory adipokines such as adiponectin. At the same time, these animals have improved insulin signaling and carbohydrate homeostasis that relate to alterations in the secretory profile of adipose tissue including increased production and release of anti-inflammatory adipokines. This suggests that reduced inflammation promoting healthy metabolism may represent one of the major mechanisms of extended longevity in long-lived mutant mice and likely also in the human.
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Affiliation(s)
- Michal M Masternak
- Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, FL USA
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Hanses F, Kopp A, Bala M, Buechler C, Falk W, Salzberger B, Schäffler A. Intracellular survival of Staphylococcus aureus in adipocyte-like differentiated 3T3-L1 cells is glucose dependent and alters cytokine, chemokine, and adipokine secretion. Endocrinology 2011; 152:4148-57. [PMID: 21914779 DOI: 10.1210/en.2011-0103] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Although obesity and type 2 diabetes mellitus are associated with Gram-positive infections and a worse clinical outcome, it is unknown whether adipocytes can be infected by Gram-positive bacteria. Adipocyte-like differentiated 3T3-L1 cells and Staphylococcus aureus were used for infection experiments under normoglycemic (100 mg/dl) and hyperglycemic (450 mg/dl) conditions in the presence/absence of insulin (1 μm). Intracellular presence and survival of S. aureus was investigated quantitatively. Supernatant cytokines, chemokines, and adipokines were measured by ELISA. Lipid metabolism and cellular morphology of infected adipocytes were investigated by different techniques. The present study provides the proof of principle that adipocyte-like cells can be infected by S. aureus dose dependently for up to 5 d. Importantly, low bacterial inocula did not affect cell viability. Intracellular survival of S. aureus was glucose dependent but not insulin dependent, and insulin receptor expression and insulin receptor signaling were not altered. Infection increased macrophage chemoattractant protein-1, visfatin, and IL-6 secretion, whereas resistin and adiponectin were decreased. Infected adipocytes had higher intracellular triacylglycerol concentrations and larger lipid droplets because of a decreased lipolysis. Taken together, infection of adipocytes by S. aureus is glucose dependent, inhibits cellular lipolysis, and affects the secretion of immunomodulating adipokines differentially. Because cell viability is not affected during infection, adipose tissue might function as a host for chronic infection by bacteria-causing metabolic, proinflammatory, and prodiabetic disturbances.
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Affiliation(s)
- Frank Hanses
- Department of Internal Medicine I, University Hospital Regensburg, Franz-Josef-Strauss Allee 11, 93042 Regensburg, Germany.
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10
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Neumeier M, Bauer S, Brühl H, Eisinger K, Kopp A, Abke S, Walter R, Schäffler A, Buechler C. Adiponectin stimulates release of CCL2, -3, -4 and -5 while the surface abundance of CCR2 and -5 is simultaneously reduced in primary human monocytes. Cytokine 2011; 56:573-80. [PMID: 21890375 DOI: 10.1016/j.cyto.2011.08.017] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2011] [Revised: 08/02/2011] [Accepted: 08/05/2011] [Indexed: 11/17/2022]
Abstract
The adipokine adiponectin is well known to affect the function of immune cells and upregulation of CCL2 by adiponectin in monocytes/macrophages has already been reported. In the current study the effect of adiponectin on CCL2, -3, -4, and -5 and their corresponding receptors CCR1, CCR2, and CCR5 has been analyzed. Adiponectin elevates mRNA and protein of the CC chemokines in primary human monocytes. Simultaneously the surface abundance of CCR2 and CCR5 is reduced while CCR1 is not affected. Downregulation of CCR2 by adiponectin is blocked by a CCR2 antagonist although expression of the CCL2 regulated genes CCR2 and TGF-beta 1 is not altered in the adiponectin-incubated monocytes. CCL2, -3, and -5 concentrations measured in supernatants of monocytes of normal-weight (NW), overweight (OW), and type 2 diabetic (T2D) patients positively correlate with BMI and are increased in obesity and T2D. In contrast CCL4 is similarly abundant in the supernatants of all of these monocytes. The degree of adiponectin-mediated induction of the chemokines CCL3, -4, and -5 negatively correlates with their basal levels and upregulation of CCL3 and CCL5 is significantly impaired in OW and T2D cells. Serum concentrations of these chemokines are almost equal in the three groups and do not correlate with the levels in monocyte supernatants. In conclusion these data demonstrate that adiponectin stimulates release of CCL2 to CCL5 in primary human monocytes, and induction in cells of overweight probands is partly impaired. Adiponectin also lowers surface abundance of CCR2 and CCR5 and downregulation of CCR2 seems to depend on autocrine/paracrine effects of CCL2.
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MESH Headings
- Adiponectin/pharmacology
- Adult
- Aged
- Body Weight/drug effects
- Cell Membrane/drug effects
- Cell Membrane/metabolism
- Cells, Cultured
- Chemokine CCL2/blood
- Chemokine CCL2/genetics
- Chemokine CCL2/metabolism
- Chemokine CCL3/blood
- Chemokine CCL3/genetics
- Chemokine CCL3/metabolism
- Chemokine CCL4/blood
- Chemokine CCL4/genetics
- Chemokine CCL4/metabolism
- Chemokine CCL5/blood
- Chemokine CCL5/genetics
- Chemokine CCL5/metabolism
- Chemokines, CC/blood
- Chemokines, CC/genetics
- Chemokines, CC/metabolism
- Diabetes Mellitus, Type 2/blood
- Diabetes Mellitus, Type 2/immunology
- Humans
- Male
- Middle Aged
- Monocytes/cytology
- Monocytes/drug effects
- Monocytes/immunology
- Monocytes/metabolism
- Overweight/blood
- Overweight/immunology
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Receptors, CCR2/metabolism
- Receptors, CCR5/metabolism
- Subcellular Fractions/drug effects
- Subcellular Fractions/immunology
- Up-Regulation/drug effects
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Affiliation(s)
- Markus Neumeier
- Department of Internal Medicine I, Regensburg University Hospital, D-93042 Regensburg, Germany
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