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Guo L, Wang W, Wang Q, Hao D, Ito M, Huang B, Mineo C, Shaul PW, Choi J, Huang LF, Li XA. The adrenal stress response is an essential host response against therapy-induced lethal immune activation. Sci Signal 2023; 16:eadd4900. [PMID: 36943922 PMCID: PMC10091512 DOI: 10.1126/scisignal.add4900] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/23/2023]
Abstract
Cytokine release syndrome (CRS) is a systemic inflammatory syndrome associated with infection- or drug-induced T cell activation and can cause multiple organ failure and even death. Because current treatments are ineffective in some patients with severe CRS, we set out to identify risk factors and mechanisms behind severe CRS that might lead to preventive therapies and better clinical outcomes in patients. In mice, we found that deficiency in the adrenal stress response-with similarities to such in patients called relative adrenal insufficiency (RAI)-conferred a high risk for lethal CRS. Mice treated with CD3 antibodies were protected against lethal CRS by the production of glucocorticoids (GC) induced by the adrenal stress response in a manner dependent on the scavenger receptor B1 (SR-BI), a receptor for high-density lipoprotein (HDL). Mice with whole-body or adrenal gland-specific SR-BI deficiency exhibited impaired GC production, more severe CRS, and increased mortality in response to CD3 antibodies. Pretreatment with a low dose of GC effectively suppressed the development of CRS and rescued survival in SR-BI-deficient mice without compromising T cell function through apoptosis. Our findings suggest that RAI may be a risk factor for therapy-induced CRS and that pretreating RAI patients with GC may prevent lethal CRS.
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Affiliation(s)
- Ling Guo
- Saha Cardiovascular Research Center, University of Kentucky College of Medicine, Lexington, KY 40536, USA
| | - Weinan Wang
- Division of Experimental Hematology and Cancer Biology, Brain Tumor Center, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, 45229, USA
| | - Qian Wang
- Saha Cardiovascular Research Center, University of Kentucky College of Medicine, Lexington, KY 40536, USA
| | - Dan Hao
- Department of Pharmacology and Nutritional Sciences, University of Kentucky College of Medicine, Lexington, KY 40536, USA
| | - Misa Ito
- Department of Pharmacology and Nutritional Sciences, University of Kentucky College of Medicine, Lexington, KY 40536, USA
| | - Bin Huang
- Division of Cancer Biostatistics, University of Kentucky College of Medicine, Lexington, KY 40536, USA
| | - Chieko Mineo
- Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Philip W Shaul
- Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Jaebok Choi
- Department of Medicine, Washington University School of Medicine at St. Louis, St. Louis, MO 63110, USA
| | - L Frank Huang
- Division of Experimental Hematology and Cancer Biology, Brain Tumor Center, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, 45229, USA
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, 45229, USA
| | - Xiang-An Li
- Saha Cardiovascular Research Center, University of Kentucky College of Medicine, Lexington, KY 40536, USA
- Department of Pharmacology and Nutritional Sciences, University of Kentucky College of Medicine, Lexington, KY 40536, USA
- Lexington VA Healthcare System, 1101 Veterans Drive, Lexington, KY 40502, USA
- Department of Physiology, University of Kentucky College of Medicine, Lexington, KY 40536, USA
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2
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Machiraju D, Schäfer S, Hassel JC. Potential Reasons for Unresponsiveness to Anti-PD1 Immunotherapy in Young Patients with Advanced Melanoma. Life (Basel) 2021; 11:1318. [PMID: 34947849 PMCID: PMC8707626 DOI: 10.3390/life11121318] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Revised: 11/23/2021] [Accepted: 11/25/2021] [Indexed: 02/07/2023] Open
Abstract
The impact of age on the clinical benefit of anti-PD1 immunotherapy in advanced melanoma patients has been evolving recently. Due to a reduced immune function in elderly patients, young patients with a robust immune system are theoretically expected to benefit more from the treatment approach. However, in contrast to this hypothesis, recent studies in patients with metastatic melanoma have demonstrated that immunotherapy, especially with anti-PD1 treatment, is less effective in patients below 65 years, on average, with significantly lower responses and reduced overall survival compared to patients above 65 years of age. Besides, data on young patients are even more sparse. Hence, in this review, we will focus on age-dependent differences in the previously described resistance mechanisms to the treatment and discuss the development of potential combination treatment strategies for enhancing the anti-tumor efficacy of anti-PD1 or PDL1 treatment in young melanoma patients.
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Affiliation(s)
- Devayani Machiraju
- Department of Dermatology and National Center for Tumor Diseases, University Hospital Heidelberg, 69120 Heidelberg, Germany;
| | - Sarah Schäfer
- Department of Dermatology, University Hospital Heidelberg, Ruprecht-Karls Universität Heidelberg, 69120 Heidelberg, Germany;
| | - Jessica C. Hassel
- Department of Dermatology and National Center for Tumor Diseases, University Hospital Heidelberg, 69120 Heidelberg, Germany;
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3
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Tawbi HA, Forsyth PA, Hodi FS, Lao CD, Moschos SJ, Hamid O, Atkins MB, Lewis K, Thomas RP, Glaspy JA, Jang S, Algazi AP, Khushalani NI, Postow MA, Pavlick AC, Ernstoff MS, Reardon DA, Puzanov I, Kudchadkar RR, Tarhini AA, Sumbul A, Rizzo JI, Margolin KA. Safety and Efficacy of the Combination of Nivolumab Plus Ipilimumab in Patients With Melanoma and Asymptomatic or Symptomatic Brain Metastases (CheckMate 204). Neuro Oncol 2021; 23:1961-1973. [PMID: 33880555 PMCID: PMC8563325 DOI: 10.1093/neuonc/noab094] [Citation(s) in RCA: 56] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Background In patients with melanoma and asymptomatic brain metastases (MBM), nivolumab plus ipilimumab provided an intracranial response rate of 55%. Here, we present the first report for patients who were symptomatic and/or required corticosteroids and updated data for asymptomatic patients. Methods Patients with measurable MBM, 0.5-3.0 cm, were enrolled into Cohort A (asymptomatic) or Cohort B (stable neurologic symptoms and/or receiving corticosteroids). Nivolumab, 1 mg/kg, and ipilimumab, 3 mg/kg, were given intravenously every 3 weeks ×4, followed by nivolumab, 3 mg/kg, every 2 weeks until progression, unacceptable toxicity, or 24 months. The primary endpoint was intracranial clinical benefit rate (CBR; complete response [CR], partial response [PR], or stable disease ≥6 months). Results Symptomatic patients (N = 18) received a median of one nivolumab and ipilimumab combination dose and had an intracranial CBR of 22.2%. Two of 12 patients on corticosteroids had CR; 2 responded among the 6 not on corticosteroids. Median intracranial progression-free survival (PFS) and overall survival (OS) were 1.2 and 8.7 months, respectively. In contrast, with 20.6 months of follow-up, we confirmed an intracranial CBR of 58.4% in asymptomatic patients (N = 101); median duration of response, PFS, and OS were not reached. No new safety signals were observed. Conclusions Nivolumab plus ipilimumab provides durable clinical benefit for asymptomatic patients with MBM and should be considered for first-line therapy. This regimen has limited activity in MBM patients with neurologic symptoms and/or requiring corticosteroids, supporting the need for alternative approaches and methods to reduce the dependency on corticosteroids. Clinical trial registration. ClinicalTrials.gov, NCT02320058.
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Affiliation(s)
- Hussein A Tawbi
- Department of Melanoma Medical Oncology, Division of Cancer Medicine, The University of Texas MD Anderson Cancer Center, Houston, TX
| | - Peter A Forsyth
- Department of Neuro-Oncology, Moffitt Cancer Center and Research Institute, Tampa, FL
| | - F Stephen Hodi
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA
| | | | - Stergios J Moschos
- Division of Hematology & Oncology, The University of North Carolina Lineberger Comprehensive Cancer Center, Chapel Hill, NC
| | - Omid Hamid
- Department of Translational Research & Immunotherapy, The Angeles Clinic and Research Institute, A Cedars-Sinai Affilliate, Los Angeles, CA
| | - Michael B Atkins
- Department of Medical Oncology,Georgetown-Lombardi Comprehensive Cancer Center, Washington DC
| | - Karl Lewis
- Department of Medical Oncology, University of Colorado Comprehensive Cancer Center, Aurora, CO
| | - Reena P Thomas
- Department of Neurology, Stanford University Cancer Center, Stanford, CA
| | - John A Glaspy
- Department of Medicine, Jonsson Comprehensive Cancer Center, University of California, Los Angeles, CA
| | - Sekwon Jang
- Department of Medicine, Inova Schar Cancer Institute, Virginia Commonwealth University, Fairfax, VA
| | - Alain P Algazi
- Department of Hematology & Oncology, Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, CA
| | - Nikhil I Khushalani
- Department of Cutaneous Oncology, H. Lee Moffitt Cancer Center & Research Institute, Tampa, FL
| | - Michael A Postow
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY
| | - Anna C Pavlick
- Department of Medical Oncology, Weill Cornell Medicine, New York, NY
| | - Marc S Ernstoff
- Department of Immuno-Oncology, Division of Cancer Treatment and Diagnosis, National Cancer Institute at the National Institutes of Health, Rockville, MD
| | - David A Reardon
- Center for Neuro-Oncology, Dana-Farber Cancer Institute, Boston, MA
| | - Igor Puzanov
- Department of Medical Oncology, Roswell Park Cancer Institute, Buffalo, NY
| | - Ragini R Kudchadkar
- Department of Hematology and Medical Oncology, Winship Cancer Institute of Emory University, Atlanta, GA
| | - Ahmad A Tarhini
- Department of Cutaneous Oncology, H. Lee Moffitt Cancer Center & Research Institute, Tampa, FL
| | - Anne Sumbul
- Biostatistics, Bristol Myers Squibb Company, Princeton, NJ
| | - Jasmine I Rizzo
- Oncology Clinical Development, Bristol Myers Squibb Company, Princeton, NJ
| | - Kim A Margolin
- Department of Medical Oncology, City of Hope, Duarte, CA
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4
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Pol JG, Caudana P, Paillet J, Piaggio E, Kroemer G. Effects of interleukin-2 in immunostimulation and immunosuppression. J Exp Med 2020; 217:jem.20191247. [PMID: 31611250 PMCID: PMC7037245 DOI: 10.1084/jem.20191247] [Citation(s) in RCA: 91] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Revised: 08/29/2019] [Accepted: 09/23/2019] [Indexed: 12/19/2022] Open
Abstract
Distinctions in the nature and spatiotemporal expression of IL-2R subunits on conventional versus regulatory T cells are exploited to manipulate IL-2 immunomodulatory effects. Particularly, low-dose IL-2 and some recombinant derivatives are being evaluated to enhance/inhibit immune responses for therapeutic purposes. Historically, interleukin-2 (IL-2) was first described as an immunostimulatory factor that supports the expansion of activated effector T cells. A layer of sophistication arose when regulatory CD4+ T lymphocytes (Tregs) were shown to require IL-2 for their development, homeostasis, and immunosuppressive functions. Fundamental distinctions in the nature and spatiotemporal expression patterns of IL-2 receptor subunits on naive/memory/effector T cells versus Tregs are now being exploited to manipulate the immunomodulatory effects of IL-2 for therapeutic purposes. Although high-dose IL-2 administration has yielded discrete clinical responses, low-dose IL-2 as well as innovative strategies based on IL-2 derivatives, including “muteins,” immunocomplexes, and immunocytokines, are being explored to therapeutically enhance or inhibit the immune response.
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Affiliation(s)
- Jonathan G Pol
- Université de Paris, Paris, France.,Equipe 11 labellisée Ligue Nationale contre le Cancer, Centre de Recherche des Cordeliers, Paris, France.,Institut National de la Santé et de la Recherche Médicale (INSERM), U1138, Paris, France.,Sorbonne Université, Paris, France.,Metabolomics and Cell Biology Platforms, Gustave Roussy Cancer Campus, Villejuif, France
| | - Pamela Caudana
- Institut Curie, Université de Recherche Paris Sciences & Lettres (PSL), Institut National de la Santé et de la Recherche Médicale (INSERM), U932, Paris, France
| | - Juliette Paillet
- Université de Paris, Paris, France.,Equipe 11 labellisée Ligue Nationale contre le Cancer, Centre de Recherche des Cordeliers, Paris, France.,Institut National de la Santé et de la Recherche Médicale (INSERM), U1138, Paris, France.,Sorbonne Université, Paris, France.,Metabolomics and Cell Biology Platforms, Gustave Roussy Cancer Campus, Villejuif, France.,Université Paris-Sud/Paris XI, Faculté de Médecine, Kremlin-Bicêtre, France
| | - Eliane Piaggio
- Institut Curie, Université de Recherche Paris Sciences & Lettres (PSL), Institut National de la Santé et de la Recherche Médicale (INSERM), U932, Paris, France.,Centre d'Investigation Clinique Biothérapie CICBT 1428, Institut Curie, Paris, France
| | - Guido Kroemer
- Université de Paris, Paris, France.,Equipe 11 labellisée Ligue Nationale contre le Cancer, Centre de Recherche des Cordeliers, Paris, France.,Institut National de la Santé et de la Recherche Médicale (INSERM), U1138, Paris, France.,Sorbonne Université, Paris, France.,Metabolomics and Cell Biology Platforms, Gustave Roussy Cancer Campus, Villejuif, France.,Pôle de Biologie, Hôpital Européen Georges Pompidou, Assistance publique - Hôpitaux de Paris (AP-HP), Paris, France.,Suzhou Institute for Systems Medicine, Chinese Academy of Sciences, Suzhou, China.,Department of Women's and Children's Health, Karolinska University Hospital, Stockholm, Sweden
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5
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Yang Z, Liu J, Zhou Y, Zhao X, Zhao Q, Liu J. The effect of corticosteroid treatment on patients with coronavirus infection: a systematic review and meta-analysis. J Infect 2020; 81:e13-e20. [PMID: 32283144 PMCID: PMC7195158 DOI: 10.1016/j.jinf.2020.03.062] [Citation(s) in RCA: 226] [Impact Index Per Article: 56.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Accepted: 03/31/2020] [Indexed: 12/15/2022]
Abstract
OBJECTIVES An outbreak of novel coronavirus in 2019 threatens the health of people, and there is no proven pharmacological treatment. Although corticosteroids were widely used during outbreaks of severe acute respiratory syndrome and Middle East respiratory syndrome, their efficacy remainedhighly controversial. We aimed to further evaluate the influence of corticosteroids on patients with coronavirus infection. METHODS We conducted a comprehensive search of literature published in PubMed, Embase, Cochrane library, and China National Knowledge Infrastructure (CNKI) from January 1, 2002 to March 15, 2020. All statistical analyses in this study were performed on stata14.0. RESULTS A total of 5270 patients from 15 studies were included in this meta-analysis. The result indicated that critical patients were more likely to require corticosteroids therapy (risk ratio [RR] = 1.56, 95% confidence interval [CI] = 1.28-1.90, P<0.001). However, corticosteroid treatment was associated with higher mortality (RR = 2.11, 95%CI = 1.13-3.94, P = 0.019), longer length of stay (weighted mean difference [WMD] = 6.31, 95%CI = 5.26-7.37, P<0.001), a higher rate of bacterial infection (RR = 2.08, 95%CI = 1.54-2.81, P<0.001), and hypokalemia (RR = 2.21, 95%CI = 1.07-4.55, P = 0.032) but not hyperglycemia (RR = 1.37, 95%CI=0.68-2.76, P = 0.376) or hypocalcemia (RR = 1.35, 95%CI = 0.77-2.37, P = 0.302). CONCLUSIONS Patients with severe conditions are more likely to require corticosteroids. Corticosteroid use is associated with increased mortality in patients with coronavirus pneumonia.
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Affiliation(s)
- Zhenwei Yang
- Department of Gastroenterology, Zhongnan Hospital of Wuhan University, Wuhan 430071, China; Hubei Clinical Center and Key Laboratory of Intestinal and Colorectal Diseases, Wuhan 430071, China
| | - Jialong Liu
- Department of Gastroenterology, Zhongnan Hospital of Wuhan University, Wuhan 430071, China; Hubei Clinical Center and Key Laboratory of Intestinal and Colorectal Diseases, Wuhan 430071, China
| | - Yunjiao Zhou
- Department of Gastroenterology, Zhongnan Hospital of Wuhan University, Wuhan 430071, China; Hubei Clinical Center and Key Laboratory of Intestinal and Colorectal Diseases, Wuhan 430071, China
| | - Xixian Zhao
- Department of Gastroenterology, Zhongnan Hospital of Wuhan University, Wuhan 430071, China; Hubei Clinical Center and Key Laboratory of Intestinal and Colorectal Diseases, Wuhan 430071, China
| | - Qiu Zhao
- Department of Gastroenterology, Zhongnan Hospital of Wuhan University, Wuhan 430071, China; Hubei Clinical Center and Key Laboratory of Intestinal and Colorectal Diseases, Wuhan 430071, China
| | - Jing Liu
- Department of Gastroenterology, Zhongnan Hospital of Wuhan University, Wuhan 430071, China; Hubei Clinical Center and Key Laboratory of Intestinal and Colorectal Diseases, Wuhan 430071, China.
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6
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Ma Y, Yang H, Kroemer G. Endogenous and exogenous glucocorticoids abolish the efficacy of immune-dependent cancer therapies. Oncoimmunology 2019; 9:1673635. [PMID: 32002285 PMCID: PMC6959448 DOI: 10.1080/2162402x.2019.1673635] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Accepted: 09/25/2019] [Indexed: 01/08/2023] Open
Abstract
Glucocorticoids mediate potent anti-inflammatory and immunosuppressive effects. A chronic elevation of the endogenous glucocorticoid tonus subsequent to mental stress, as well as continuous treatment with exogenous glucocorticoids, activate an immunosuppressive transcription factor, TSC22D3, in dendritic cells, causing the subversion of cancer therapy-elicited antineoplastic immune responses and subsequent therapeutic failure.
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Affiliation(s)
- Yuting Ma
- Center for Systems Medicine, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China.,Suzhou Institute of Systems Medicine, Suzhou, Jiangsu, China
| | - Heng Yang
- Center for Systems Medicine, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China.,Suzhou Institute of Systems Medicine, Suzhou, Jiangsu, China
| | - Guido Kroemer
- Center for Systems Medicine, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China.,Suzhou Institute of Systems Medicine, Suzhou, Jiangsu, China.,Université Paris Descartes, Sorbonne Paris Cité, Paris, France.,Equipe 11 labellisée Ligue Nationale contre le Cancer, Centre de Recherche des Cordeliers, Paris, France.,Institut National de la Santé et de la Recherche Médicale, Paris, France.,Université Pierre et Marie Curie, Paris, France.,Metabolomics and Cell Biology Platforms, Gustave Roussy Cancer Campus, Villejuif, France.,Pôle de Biologie, Hôpital Européen Georges Pompidou, AP-HP, Paris, France.,Department of Women's and Children's Health, Karolinska University Hospital, Stockholm, Sweden
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7
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Stress–glucocorticoid–TSC22D3 axis compromises therapy-induced antitumor immunity. Nat Med 2019; 25:1428-1441. [DOI: 10.1038/s41591-019-0566-4] [Citation(s) in RCA: 164] [Impact Index Per Article: 32.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2018] [Accepted: 07/31/2019] [Indexed: 12/16/2022]
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8
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Intestinal glucocorticoid synthesis enzymes in pediatric inflammatory bowel disease patients. Genes Immun 2019; 20:566-576. [PMID: 30686824 DOI: 10.1038/s41435-019-0056-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Revised: 12/18/2018] [Accepted: 12/21/2018] [Indexed: 02/08/2023]
Abstract
Inflammatory bowel disease (IBD), such as Crohn's disease and ulcerative colitis are devastating chronic immunopathologies of the intestinal mucosa, which are frequently treated by immunosuppressive glucocorticoids. Endogenous glucocorticoids are not only produced by the adrenal glands, but also by the intestinal epithelium. Local glucocorticoid synthesis critically contributes to the immune homeostasis of the intestinal mucosa. As defective intestinal glucocorticoid synthesis has been associated with the development of IBD, we investigated the expression of steroidogenic enzymes and the key transcriptional regulator Liver Receptor Homolog-1 (LRH-1/NR5A2) in ileal and colonic biopsies human pediatric IBD and control patients. Furthermore, the induction of steroidogenic enzymes and their transcriptional regulation by LRH-1 was investigated in a mouse model of experimental colitis. These analyses revealed that colitis-induced expression of steroidogenic enzymes in the murine colon is dependent on the presence of LRH-1, as intestinal deletion of LRH-1 strongly reduced their colitis-induced expression. Similarly, a strong correlation between the expression of LRH-1 and different steroidogenic enzymes was seen in intestinal biopsies of human pediatric patients. Importantly, reduced expression of hydroxysteroid dehydrogenase 11B1 (HSD11B1) was observed in IBD patients compared to control patients, suggesting that defective local reactivation of glucocorticoids could contribute to the pathogenesis of IBD.
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9
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Huang J, Jia R, Brunner T. Local synthesis of immunosuppressive glucocorticoids in the intestinal epithelium regulates anti-viral immune responses. Cell Immunol 2018; 334:1-10. [PMID: 30144940 DOI: 10.1016/j.cellimm.2018.08.009] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Revised: 07/10/2018] [Accepted: 08/17/2018] [Indexed: 12/21/2022]
Abstract
The nuclear receptor Small Heterodimer Partner (SHP) is a transcriptional target and inhibitor of Liver Receptor Homolog 1 (LRH-1), the transcriptional regulator of intestinal glucocorticoid (GC) synthesis. The role of SHP in the regulation of intestinal GC synthesis and its impact on T cell-mediated anti-viral immune responses in the intestinal mucosa are currently not understood. Lymphocytic choriomeningitis virus (LCMV) infection promoted intestinal GC synthesis, which was enhanced in SHP-deficient mice. Intestinal GC suppressed the expansion and altered the activation of virus-specific T cells. In contrast, deletion of LRH-1 reduced intestinal GC synthesis and accelerated the expansion of cytotoxic T cells post LCMV infection. These findings show that virus-induced intestinal GC synthesis is controlled by LRH-1 and SHP, and that local steroidogenesis contributes to the maintenance of intestinal immune homeostasis. Thus, LRH-1-regulated intestinal GC synthesis could represent an interesting therapeutic target in the treatment of inflammatory disorders.
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Affiliation(s)
- Juan Huang
- Biochemical Pharmacology, Department of Biology, University of Konstanz, Germany; Institute of Preventive Veterinary Medicine, Sichuan Agricultural University, Wenjiang District, Chengdu, China
| | - Renyong Jia
- Institute of Preventive Veterinary Medicine, Sichuan Agricultural University, Wenjiang District, Chengdu, China
| | - Thomas Brunner
- Biochemical Pharmacology, Department of Biology, University of Konstanz, Germany.
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10
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Sales-Campos H, de Souza PR, Basso PJ, Nardini V, Silva A, Banquieri F, Alves VBF, Chica JEL, Nomizo A, Cardoso CRB. Amelioration of experimental colitis after short-term therapy with glucocorticoid and its relationship to the induction of different regulatory markers. Immunology 2016; 150:115-126. [PMID: 27618667 DOI: 10.1111/imm.12672] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Revised: 09/05/2016] [Accepted: 09/06/2016] [Indexed: 12/15/2022] Open
Abstract
The clinical benefits of short-term therapy with glucocorticoids (GC) in patients with inflammatory bowel disease (IBD) are widely known. However, the effects of this treatment towards the re-establishment of the regulatory network in IBD are not fully explored. We have evaluated the immunological effects of the abbreviated GC therapy in experimental colitis induced by 3% dextran sulphate sodium in C57BL/6 mice. Treatment with GC improved disease outcome, constrained circulating leucocytes and ameliorated intestinal inflammation. The control of the local inflammatory responses involved a reduction in the expression of interferon-γ and interleukin-1β, associated with augmented mRNA levels of peroxisome proliferator-activated receptors (α and γ) in intestine. Furthermore, there was a reduction of CD4+ T cells producing interferon-γ, together with an increased frequency of the putative regulatory population of T cells producing interleukin-10, in spleen. These systemic alterations were accompanied by a decrease in the proliferative potential of splenocytes of mice treated in vivo with GC. Notably, treatment with GC also led to an increase in the frequency of the regulatory markers GITR, CTLA-4, PD-1, CD73 and FoxP3, more prominently in spleen. Taken together, our results pointed to a role of GC in the control of leucocyte responsiveness and re-establishment of a regulatory system, which probably contributed to disease control and the restoration of immune balance. Finally, this is the first time that GC treatment was associated with the modulation of a broad number of regulatory markers in an experimental model of colitis.
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Affiliation(s)
- Helioswilton Sales-Campos
- Departamento de Análises Clínicas, Toxicológicas e Bromatológicas - Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, Brazil
| | - Patrícia R de Souza
- Departamento de Análises Clínicas, Toxicológicas e Bromatológicas - Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, Brazil
| | - Paulo J Basso
- Departamento de Bioquímica e Imunologia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, Brazil
| | - Viviani Nardini
- Departamento de Análises Clínicas, Toxicológicas e Bromatológicas - Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, Brazil
| | - Angelica Silva
- Departamento de Análises Clínicas, Toxicológicas e Bromatológicas - Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, Brazil
| | - Fernanda Banquieri
- Departamento de Análises Clínicas, Toxicológicas e Bromatológicas - Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, Brazil
| | - Vanessa B F Alves
- Departamento de Análises Clínicas, Toxicológicas e Bromatológicas - Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, Brazil
| | - Javier E L Chica
- Instituto de Ciências Biológicas e Naturais, Universidade Federal do Triângulo Mineiro, Uberaba, Brazil
| | - Auro Nomizo
- Departamento de Análises Clínicas, Toxicológicas e Bromatológicas - Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, Brazil
| | - Cristina R B Cardoso
- Departamento de Análises Clínicas, Toxicológicas e Bromatológicas - Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, Brazil
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11
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Chapes S, Beharka A. Lipopolysaccharide is required for the lethal effects of enterotoxin B after D-galactosamine sensitization. ACTA ACUST UNITED AC 2016. [DOI: 10.1177/096805199500200406] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
We tested the D-galactosamine sensitization model with staphylococcal enterotoxin B (SEB). LPS was required for the lethal effects of SEB in D-galactosamine sensitized mice. Only two (2/62) among the C3HeB/FeJ (H-2k), Balb/c (H-2d) and C57BL/6J (H-2b) mice died in response to SEB in the absence of LPS whereas injection of SEB and minimally lethal concentrations of LPS became highly toxic. Similar to LPS, the lethal effect of SEB was dependent on the mouse strain used. Mouse strains more sensitive to the effects of LPS (Balb/c and C57BL/6J) were also more sensitive to the effects of SEB in comparison to C3H mice when equivalent doses of LPS and SEB were used. Among Balb/c and C3HeB/FeJ but not C57BL/6J mice, SEB (20 μg) potentiated the lethal effects of LPS at low doses (0.1 μg LPS), but had an apparent protective effect at high doses (1 μg LPS). Lastly, there was an inverse correlation between pathogenesis and serum IL-2 concentrations and splenic T cell activation in C3H mice. However, macrophage mobilization did correlate with lethality. Therefore, some questions remain about the mechanisms involved in the D-galactosamine/SEB pathogenesis model. We conclude that when sensitizing mice with D-galactosamine and assessing the lethal effects of SEB, endotoxin contamination must be assessed.
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Affiliation(s)
- S.K. Chapes
- Division of Biology, Kansas State University, Manhattan, Kansas, USA
| | - A.A. Beharka
- Division of Biology, Kansas State University, Manhattan, Kansas, USA
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Adrenal-Derived Hormones Differentially Modulate Intestinal Immunity in Experimental Colitis. Mediators Inflamm 2016; 2016:4936370. [PMID: 27403034 PMCID: PMC4923585 DOI: 10.1155/2016/4936370] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2016] [Accepted: 05/19/2016] [Indexed: 01/09/2023] Open
Abstract
The adrenal glands are able to modulate immune responses through neuroimmunoendocrine interactions and cortisol secretion that could suppress exacerbated inflammation such as in inflammatory bowel disease (IBD). Therefore, here we evaluated the role of these glands in experimental colitis induced by 3% dextran sulfate sodium (DSS) in C57BL/6 mice subjected to adrenalectomy, with or without glucocorticoid (GC) replacement. Mice succumbed to colitis without adrenals with a higher clinical score and augmented systemic levels of IL-6 and lower LPS. Furthermore, adrenalectomy negatively modulated systemic regulatory markers. The absence of adrenals resulted in augmented tolerogenic lamina propria dendritic cells but no compensatory local production of corticosterone and decreased mucosal inflammation associated with increased IFN-γ and FasL in the intestine. To clarify the importance of GC in this scenario, GC replacement in adrenalectomized mice restored different markers to the same degree of that observed in DSS group. Finally, this is the first time that adrenal-derived hormones, especially GC, were associated with the differential local modulation of the gut infiltrate, also pointing to a relationship between adrenalectomy and the modulation of systemic regulatory markers. These findings may elucidate some neuroimmunoendocrine mechanisms that dictate colitis outcome.
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Abstract
Glucocorticoids (GC) are steroid hormones with important implications in the treatment of various inflammatory and autoimmune diseases. At the same time GC are known to have numerous side-effects. Endogenous GC are predominantly produced by the adrenal glands, and adrenal-derived GC serve important functions in the regulation of development, metabolism, and immune regulation. The last two decades of research have led to the identification of numerous alternative sources of extra-adrenal GC synthesis. Among other tissues the intestine and lung are capable of locally producing considerable amounts of immunoregulatory GC. This local steroidogenesis in these mucosal tissues appears to be regulated by transcription factors and mediators different from those in the adrenals, likely reflecting an adaptation to the local requirements and conditions. Here we summarize the current knowledge about the extra-adrenal GC synthesis in the mucosal tissues, with special emphasis on the intestinal epithelium, and its implication on the regulation of immune homeostasis and inflammatory processes.
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Affiliation(s)
- Feodora Kostadinova
- Biochemical Pharmacology, Department of Biology, University of Konstanz , Germany
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14
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Meijers RWJ, Litjens NHR, de Wit EA, Langerak AW, Baan CC, Betjes MGH. Uremia-associated immunological aging is stably imprinted in the T-cell system and not reversed by kidney transplantation. Transpl Int 2014; 27:1272-84. [DOI: 10.1111/tri.12416] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2014] [Revised: 06/21/2014] [Accepted: 07/26/2014] [Indexed: 11/28/2022]
Affiliation(s)
- Ruud W. J. Meijers
- Department of Internal Medicine; Section Nephrology and Transplantation; Erasmus MC, University Medical Center; Rotterdam The Netherlands
| | - Nicolle H. R. Litjens
- Department of Internal Medicine; Section Nephrology and Transplantation; Erasmus MC, University Medical Center; Rotterdam The Netherlands
| | - Elly A. de Wit
- Department of Internal Medicine; Section Nephrology and Transplantation; Erasmus MC, University Medical Center; Rotterdam The Netherlands
| | - Anton W. Langerak
- Department of Immunology; Erasmus MC, University Medical Center; Rotterdam The Netherlands
| | - Carla C. Baan
- Department of Internal Medicine; Section Nephrology and Transplantation; Erasmus MC, University Medical Center; Rotterdam The Netherlands
| | - Michiel G. H. Betjes
- Department of Internal Medicine; Section Nephrology and Transplantation; Erasmus MC, University Medical Center; Rotterdam The Netherlands
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15
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von Geldern G, McPharlin T, Becker K. Immune mediated diseases and immune modulation in the neurocritical care unit. Neurotherapeutics 2012; 9:99-123. [PMID: 22161307 PMCID: PMC3271148 DOI: 10.1007/s13311-011-0096-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
This chapter will review the spectrum of immune-mediated diseases that affect the nervous system and may result in an admission to the neurological intensive care unit. Immunomodulatory strategies to treat acute exacerbations of neurological diseases caused by aberrant immune responses are discussed, but strategies for long-term immunosuppression are not presented. The recommendations for therapeutic intervention are based on a synthesis of the literature, and include recommendations by the Cochrane Collaborative, the American Academy of Neurology, and other key organizations. References from recent publications are provided for the disorders and therapies in which randomized clinical trials and large evidenced-based reviews do not exist. The chapter concludes with a brief review of the mechanisms of action, dosing, and side effects of commonly used immunosuppressive strategies in the neurocritical care unit.
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Affiliation(s)
- Gloria von Geldern
- Department of Neurology, Johns Hopkins School of Medicine, Baltimore, MD 21287 USA
| | - Thomas McPharlin
- University of Washington School of Pharmacy, Seattle, WA 98104 USA
| | - Kyra Becker
- Department of Neurology, University of Washington School of Medicine, Seattle, WA 98104 USA
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16
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Tischner D, Theiss J, Karabinskaya A, van den Brandt J, Reichardt SD, Karow U, Herold MJ, Lühder F, Utermöhlen O, Reichardt HM. Acid sphingomyelinase is required for protection of effector memory T cells against glucocorticoid-induced cell death. THE JOURNAL OF IMMUNOLOGY 2011; 187:4509-16. [PMID: 21948986 DOI: 10.4049/jimmunol.1100911] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The activity of acid sphingomyelinase (aSMase) was previously reported to be involved in glucocorticoid-induced cell death (GICD) of T lymphocytes. This mechanism in turn is believed to contribute to the therapeutic efficacy of glucocorticoids (GCs) in the treatment of inflammatory diseases. In this study, we reassessed the role of aSMase in GICD by using aSMase knockout mice. The absence of aSMase largely abolished the partial protection that effector memory CD4(+) T cells in wild-type mice possess against GICD. Reduced IL-2 secretion by aSMase-deficient CD4(+) T cells suggested that a lack of this important survival factor might be the cause of these cells' enhanced susceptibility to GICD. Indeed, addition of IL-2 restored the protection against GICD, whereas neutralization of IL-2 abrogated the otherwise protective effect seen in wild-type effector memory CD4(+) T cells. The therapeutic implications of the altered sensitivity of aSMase-deficient T cells to GICD were assessed in models of inflammatory disorders; namely, experimental autoimmune encephalomyelitis and acute graft-versus-host disease. Surprisingly, GC treatment was equally efficient in both models in terms of ameliorating the diseases, regardless of the genotype of the T cells. Thus, our data reveal a hitherto unrecognized contribution of aSMase to the sensitivity of effector memory CD4(+) T cells to GICD and call into question the traditionally attributed importance of GICD of T cells to the treatment of inflammatory diseases by GCs.
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Affiliation(s)
- Denise Tischner
- Department of Cellular and Molecular Immunology, University of Göttingen Medical School, Göttingen 37073, Germany
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17
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Miller AH, Pearce BD, Ruzek MC, Biron CA. Interactions Between the Hypothalamic‐Pituitary‐Adrenal Axis and Immune System During Viral Infection: Pathways for Environmental Effects on Disease Expression. Compr Physiol 2011. [DOI: 10.1002/cphy.cp070419] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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18
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Spencer RL, Kalman BA, Dhabhar FS. Role of Endogenous Glucocorticoids in Immune System Function: Regulation and Counterregulation. Compr Physiol 2011. [DOI: 10.1002/cphy.cp070418] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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19
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Superantigens increase the survival of mice bearing T cell lymphomas by inducing apoptosis of neoplastic cells. PLoS One 2010; 5:e15694. [PMID: 21203530 PMCID: PMC3008744 DOI: 10.1371/journal.pone.0015694] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2010] [Accepted: 11/23/2010] [Indexed: 11/29/2022] Open
Abstract
Superantigens bind to major histocompatibility complex class II molecules and interact with T cells expressing a particular T cell receptor Vβ inducing a strong proliferation/deletion response of the superantigen-reactive T cells. However, there have been no attempts to investigate the ability of Sags to induce apoptosis in neoplastic T cells by signaling through the Vβ region of their TCR. In the present study we show that bacterial and MMTV-encoded superantigens induce the apoptosis of AKR/J cognate lymphoma T cells both in vitro and in vivo. The Fas-Fas-L pathway was shown to be involved in the apoptosis of lymphoma T cells induced by bacterial superantigens. In vivo exposure to bacterial superantigens was able to improve the survival of lymphoma bearing mice. Moreover, the permanent expression of a retroviral encoded superantigen induced the complete remission of an aggressive lymphoma in a high percentage of mice. The possibility of a therapeutic use of superantigens in lymphoma/leukemia T cell malignancies is discussed.
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20
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Whitehouse MW. Anti-inflammatory glucocorticoid drugs: reflections after 60 years. Inflammopharmacology 2010; 19:1-19. [PMID: 21072600 DOI: 10.1007/s10787-010-0056-2] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2010] [Accepted: 09/19/2010] [Indexed: 12/14/2022]
Abstract
This review considers the problem of the serious concomitant side effects of powerful anti-inflammatory drugs modelled upon the principal human glucocorticoid hormone, cortisol. The very nature of the original bio-assays to validate their cortisol-like hormonal and anti-inflammatory activities ensured that pleiotropic toxins were selected for clinical studies. Other complicating factors have been (1) considerable reliance on bio-assays conducted in laboratory animals that primarily secrete corticosterone, not cortisol, as their principal anti-inflammatory adrenal hormone; (2) some differences in the binding of xenobiotic cortisol analogues (vis á vis cortisol) to transport proteins, detoxifying enzymes and even some intra-cellular receptors; (3) the "rogue" properties of these hormonal xenobiotics, acting independently of--but still able to suppress--hormonal mechanisms regulating endogenous cortisol; and (4) problems of intrinsic/acquired "steroid resistance", diminishing their clinical efficacy, but not necessarily all their toxicities. The rather gloomy conclusion is that devising new drugs to reproduce the effect of multi-potent hormones may be a recipe for disaster, in contexts other than simply remedying an endocrine deficiency. Promising new developments include "designed" combination therapies that allow some reduction in total steroid doses (and hopefully their side effects); sharpening strategies to limit the actual duration of steroid administration; and resurgent interest in searching for more selective analogues (both steroidal and non-steroid) with less harmful side effects. Some oversights and neglected areas of research are also considered. Overall, it now seems timely to engage in some drastic rethinking about (retaining?) these "licensed toxins" as fundamental therapies for chronic inflammation.
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21
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Noti M, Corazza N, Mueller C, Berger B, Brunner T. TNF suppresses acute intestinal inflammation by inducing local glucocorticoid synthesis. ACTA ACUST UNITED AC 2010; 207:1057-66. [PMID: 20439544 PMCID: PMC2867273 DOI: 10.1084/jem.20090849] [Citation(s) in RCA: 121] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Although tumor necrosis factor (α) (TNF) exerts proinflammatory activities in a variety of diseases, including inflammatory bowel disease, there is increasing evidence for antiinflammatory actions of TNF. In contrast, glucocorticoids (GCs) are steroid hormones that suppress inflammation, at least in part by regulating the expression and action of TNF. We report that TNF induces extraadrenal production of immunoregulatory GCs in the intestinal mucosa during acute intestinal inflammation. The absence of TNF results in a lack of colonic GC synthesis and exacerbation of dextran sodium sulfate–induced colitis. TNF seems to promote local steroidogenesis by directly inducing steroidogenic enzymes in intestinal epithelial cells. Therapeutic administration of TNF induces GC synthesis in oxazolone-induced colitis and ameliorates intestinal inflammation, whereas inhibition of intestinal GC synthesis abrogates the therapeutic effect of TNF. These data show that TNF suppresses the pathogenesis of acute intestinal inflammation by promoting local steroidogenesis.
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Affiliation(s)
- Mario Noti
- Division of Experimental Pathology, Institute of Pathology, University of Bern, 3010 Bern, Switzerland
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22
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Noti M, Sidler D, Brunner T. Extra-adrenal glucocorticoid synthesis in the intestinal epithelium: more than a drop in the ocean? Semin Immunopathol 2009; 31:237-48. [PMID: 19495759 DOI: 10.1007/s00281-009-0159-2] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2009] [Accepted: 05/14/2009] [Indexed: 12/31/2022]
Abstract
Glucocorticoids (GC) are lipophilic hormones commonly used as therapeutics in acute and chronic inflammatory disorders such as inflammatory bowel disease due to their attributed anti-inflammatory and immunosuppressive actions. Although the adrenal glands are the major source of endogenous GC, there is increasing evidence for the production of extra-adrenal GC in the brain, thymus, skin, vasculature, and the intestine. However, the physiological relevance of extra-adrenal-produced GC remains still ambiguous. Therefore, this review attracts attention to discuss possible biological benefits of extra-adrenal-synthesized GC, especially focusing on the impact of locally synthesized GC in the regulation of intestinal immune responses.
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Affiliation(s)
- Mario Noti
- Division of Immunopathology, Institute of Pathology, University of Bern, Bern, Switzerland
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23
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Atanasov AG, Leiser D, Roesselet C, Noti M, Corazza N, Schoonjans K, Brunner T. Cell cycle-dependent regulation of extra-adrenal glucocorticoid synthesis in murine intestinal epithelial cells. FASEB J 2008; 22:4117-25. [PMID: 18711026 DOI: 10.1096/fj.08-114157] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Glucocorticoids are anti-inflammatory steroids with important applications in the treatment of inflammatory diseases. Endogenous glucocorticoids are mainly produced by the adrenal glands, although there is increasing evidence for extra-adrenal sources. Recent findings show that intestinal crypt cells produce glucocorticoids, which contribute to the maintenance of intestinal immune homeostasis. Intestinal glucocorticoid synthesis is critically regulated by the transcription factor liver receptor homologue-1 (LRH-1). As expression of steroidogenic enzymes and LRH-1 is restricted to the proliferating cells of the crypts, we aimed to investigate the role of the cell cycle in the regulation of LRH-1 activity and intestinal glucocorticoid synthesis. We here show that either pharmacological or molecular modulation of cell cycle progression significantly inhibited expression of steroidogenic enzymes and synthesis of glucocorticoids in intestinal epithelial cells. Synchronization of intestinal epithelial cells in the cell cycle revealed that expression of steroidogenic enzymes is preferentially induced at the G(1)/S stage. Differentiation of immature intestinal epithelial cells to mature nonproliferating cells also resulted in reduced expression of steroidogenic enzymes. This cell cycle-related effect on intestinal steroidogenesis was found to be mediated through the regulation of LRH-1 transcriptional activity. This mechanism may restrict intestinal glucocorticoid synthesis to the proliferating cells of the crypts.
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Affiliation(s)
- Atanas G Atanasov
- Division of Immunopathology, Institute of Pathology, University of Bern, Murtenstrasse 31, 3010 Bern, Switzerland
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24
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Urbach-Ross D, Crowell B, Kusnecov AW. Relationship of varying patterns of cytokine production to the anorexic and neuroendocrine effects of repeated Staphylococcal enterotoxin A exposure. J Neuroimmunol 2008; 196:49-59. [PMID: 18407357 DOI: 10.1016/j.jneuroim.2008.02.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2007] [Revised: 02/23/2008] [Accepted: 02/25/2008] [Indexed: 10/22/2022]
Abstract
Staphylococcal enterotoxin A (SEA) is a superantigen that stimulates T cells and induces the production of multiple cytokines. Previous studies have shown that SEA augments gustatory neophobia and activates the hypothalamic-pituitary-adrenal (HPA) axis. This study aimed to determine if the cytokine response, behavioral effects, and HPA axis activation persisted after repeated SEA treatment. Male C57BL/6J mice were given 1-4 intraperitoneal injections of 5 microg SEA, after which food intake, corticosterone, or peripheral cytokines were measured. In a series of experiments, it was found that secondary exposure to SEA two or three days after priming increased corticosterone, but attenuated splenic TNFalpha, while augmenting IL-1beta, IL-2, and IFNgamma. The anorexic response was intact after secondary exposure, but absent after a third injection, which was still able to elevate corticosterone. It is unlikely that IL-1 mediated the persistent effects on corticosterone, since this was increased in groups lacking corticosterone elevations. Similarly, TNFalpha was only modestly elevated under repeated SEA conditions that elevated plasma corticosterone. This attenuation appeared to be inversely related to the levels of IL-10, the production of which incrementally rose with each successive injection. In conclusion, repeated exposure to SEA activates the HPA axis and alters behavior. However, there may be dissociation between the behavioral and endocrine effects of SEA with increased SEA exposure. Furthermore, it is possible that while TNFalpha was previously shown to be important in response to acute SEA-induced HPA axis activation, further exposure to SEA elicits other cytokines that may exert neuromodulatory effects through sensitization and/or synergistic mechanisms.
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Affiliation(s)
- Daniella Urbach-Ross
- Joint Graduate Program in Toxicology, Rutgers University, Piscataway, NJ, United States
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25
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Rogers CJ, Berrigan D, Zaharoff DA, Hance KW, Patel AC, Perkins SN, Schlom J, Greiner JW, Hursting SD. Energy restriction and exercise differentially enhance components of systemic and mucosal immunity in mice. J Nutr 2008; 138:115-22. [PMID: 18156413 PMCID: PMC2431174 DOI: 10.1093/jn/138.1.115] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The prevalence of obesity, an established risk factor for several chronic diseases, including cancer, has risen dramatically over the past 4 decades. Dietary change and/or increased physical activity are the most commonly recommended lifestyle-based strategies for preventing or reversing obesity. One of several physiological systems that may be enhanced by dietary change and exercise is the immune system. In this study, we examined the effects of energy restriction (ER; 30% reduction relative to control energy intake) and/or exercise (EX; voluntary wheel running) on systemic and mucosal immune function. Female C57BL/6 mice were randomized into 4 treatment conditions: 1) controls consumed ad libitum (AL); 2) AL with access to running wheels (AL + EX); 3) 30% ER; and 4) 30% ER with access to running wheels (ER + EX). Both ER and EX reduced spleen weight and the number of splenic T and B lymphocytes (P < 0.05). ER enhanced natural killer (NK) cell function, but reduced concanavalin A (Con A)-induced T-cell proliferation (P < 0.05). In contrast, EX enhanced Con A-induced proliferation and cytokine production from Peyer's patch cells (P < 0.05). These data suggest that ER and EX enhance some, but not all, components of the immune system and are likely working via different biological mechanisms to regulate NK and T-cell function.
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Affiliation(s)
- Connie J Rogers
- Laboratory of Tumor Immunology and Biology, Center for Cancer Research, National Cancer Institute, Bethesda, MD 20892, USA.
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26
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Pérez AR, Roggero E, Nicora A, Palazzi J, Besedovsky HO, Del Rey A, Bottasso OA. Thymus atrophy during Trypanosoma cruzi infection is caused by an immuno-endocrine imbalance. Brain Behav Immun 2007; 21:890-900. [PMID: 17412557 DOI: 10.1016/j.bbi.2007.02.004] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/28/2006] [Revised: 02/16/2007] [Accepted: 02/20/2007] [Indexed: 02/02/2023] Open
Abstract
C57BL/6 mice infected with Trypanosoma cruzi, the causal agent of Chagas' disease, develop severe thymocyte depletion paralleled by an inflammatory syndrome mediated by tumor necrosis factor-alpha (TNF-alpha). The exacerbated inflammatory reaction induces the activation of hypothalamus-pituitary-adrenal (HPA) axis with the consequent release of corticosterone (CT) into the circulation as a protective response. Thymocyte apoptosis has been related to a rise in TNF-alpha and CT levels, and both mediators are increased in T. cruzi-infected C57BL/6 mice. The depletion of immature CD4(+)CD8(+) thymocytes by apoptosis following infection with the parasite was still present in mice defective in both types of TNF-receptors (double knockout). However, thymic atrophy was prevented by adrenalectomy combined with RU486 administration, demonstrating that this is a CT-driven phenomenon. Our results put emphasis on the importance of an appropriated immuno-endocrine balance during T. cruzi infection and show that functional deviations in the immuno-endocrine equilibrium have profound effects on the thymus and disease outcome.
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Affiliation(s)
- Ana Rosa Pérez
- Instituto de Inmunología, Facultad de Ciencias Médicas, Universidad Nacional de Rosario, Santa Fe 3100 (2000) Rosario, Argentina
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27
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Plaza R, Rodriguez-Sanchez JL, Juarez C. Staphylococcal enterotoxin B in vivo modulates both gamma interferon receptor expression and ligand-induced activation of signal transducer and activator of transcription 1 in T cells. Infect Immun 2007; 75:306-13. [PMID: 17074848 PMCID: PMC1828398 DOI: 10.1128/iai.01220-06] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2006] [Revised: 09/15/2006] [Accepted: 10/19/2006] [Indexed: 01/24/2023] Open
Abstract
Superantigens (SAg) are bacterial exotoxins that provoke extreme responses in the immune system; for example, the acute hyperactivation of SAg-reactive T cells that leads to toxic shock syndrome is followed within days by strong immunosuppression. The gamma interferon (IFN-gamma) response is deeply affected in both extremes. The implication of IFN-gamma in the pathophysiology of lethal shock induced in mice after a secondary challenge with the SAg staphylococcal enterotoxin B (SEB) prompted us to study the regulation of IFN-gamma secretion and the intracellular response. We demonstrate in this study that a rechallenge with SEB becomes lethal only when given inside a critical time window after SEB priming and is associated with an increase of IFN-gamma serum release 72 h after priming. However, at this time, a selective blockade of IFN-gamma/STAT1 signaling develops in spleen cells, correlating with a lack of expression of the IFN-gamma receptor beta subunit and STAT1 in the T-cell population. Selective blockade of the STAT1 signaling pathway--while simultaneously maintaining STAT3 signaling and expression--may be a protective mechanism that shortens IFN-gamma production during the Th1 effector response. This blockade may also have consequences on switching towards a suppressor phenotype with chronic exposure to the superantigen.
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Affiliation(s)
- R Plaza
- Department of Immunology, Hospital de la Santa Creu i Sant Pau, Avda. Sant Antoni Maria Claret 167, 08025 Barcelona, Spain
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28
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Aeberli D, Leech M, Morand EF. Macrophage migration inhibitory factor and glucocorticoid sensitivity. Rheumatology (Oxford) 2006; 45:937-43. [PMID: 16705047 DOI: 10.1093/rheumatology/kel142] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Glucocorticoids (GCs) are widely used in the treatment of inflammatory diseases including rheumatoid arthritis (RA). Treatment with GC is associated with significant dose-dependent side-effects. The pro-inflammatory cytokine macrophage migration inhibitory factor (MIF) has emerged in recent years as a candidate factor which could regulate GC sensitivity. MIF is induced by GC, and is able to override anti-inflammatory actions of GCs. In this review, we summarize the pro-inflammatory actions of MIF with respect to RA, describe the interactions between MIF and GC and examine new evidence, which identifies MIF as a specific target for steroid sparing.
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Affiliation(s)
- D Aeberli
- Centre for Inflammatory Diseases, Monash Medical Centre, Locked Bag No 29, Clayton Melbourne 3168, Australia
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29
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Rossi-George A, Urbach D, Colas D, Goldfarb Y, Kusnecov AW. Neuronal, endocrine, and anorexic responses to the T-cell superantigen staphylococcal enterotoxin A: dependence on tumor necrosis factor-alpha. J Neurosci 2006; 25:5314-22. [PMID: 15930379 PMCID: PMC6725009 DOI: 10.1523/jneurosci.0687-05.2005] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Staphylococcal enterotoxin A (SEA) is a microbial superantigen that activates T-lymphocytes and induces production of various cytokines, including tumor necrosis factor-alpha (TNFalpha). Previously, it was shown that SEA activates the hypothalamic-pituitary-adrenal axis and augments gustatory neophobic behaviors. In the present study, it was hypothesized that these effects involve neuronal activation in forebrain regions mediating fear and/or anxiety and are dependent on the production of TNFalpha. Male C57BL/6J mice were given intraperitoneal injections of 10 microg of SEA and 5 microg of lipopolysaccharide (LPS) or saline and perfused 2 h later for histochemical determination of brain c-Fos immunoreactivity (IR). The results showed increased c-Fos IR in the paraventricular nucleus, arcuate nucleus, central nucleus of the amygdala, bed nucleus of the stria terminalis, and lateral septum. Challenge of TNF-/- mice with SEA did not produce a significant increase in brain c-Fos IR, although c-Fos was increased after exposure to a psychogenic stressor (i.e., open field). In additional experiments, the elevated corticosterone response to SEA was abrogated in TNF-/- mice and was shown to be corticotropin-releasing hormone dependent. Finally, the augmented reduction in novel food intake after SEA challenge was attenuated in TNF-/- mice as well as in wild-type mice administered antibody to TNFalpha. In conclusion, challenge with SEA recruits brain regions mediating stress and anxiety responses, an effect that requires endogenous TNFalpha. Whether this is indicative of all T-cell superantigens remains to be determined, although it stands in contrast to other models of neuroimmunomodulation (e.g., LPS) that involve multiple cytokine influences.
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Affiliation(s)
- Alba Rossi-George
- Behavioral Neuroscience Program, Department of Psychology, Rutgers University, Piscataway, New Jersey 08854, USA
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30
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Noble A, Giorgini A, Leggat JA. Cytokine-induced IL-10-secreting CD8 T cells represent a phenotypically distinct suppressor T-cell lineage. Blood 2006; 107:4475-83. [PMID: 16467201 DOI: 10.1182/blood-2005-10-3994] [Citation(s) in RCA: 87] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Populations of regulatory T cells (Tregs) control autoimmune and allergic immunopathology induced by self or foreign antigens. Several types of CD4(+) MHC class II-restricted Treg populations have been characterized, but the biology of CD8(+), MHC class I-restricted Tregs is less understood. We show here that CD8(+) Tregs are rapidly generated in the presence of IL-4 and IL-12, produce IL-10, and exhibit a unique cell-surface phenotype with coexpression of activation and naive cell-associated markers. They block activation of naive or effector T cells and suppress IgG/IgE antibody responses and graft-versus-host disease in vivo. Suppression is dependent on cell contact and mediated by direct T-cell-T-cell interaction that antagonizes T-cell-receptor (TCR) signals. The data establish the existence of a CD8 T-cell suppressor effector subset distinct in both phenotype and function from T cytotoxic 1 (Tc1) and Tc2 cells. Production of such CD8 Tregs has potential for cell-based therapy of CD4 or CD8 T-cell-mediated disease.
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Lo DY, Lee WM, Chien MS, Lin CC, Lee WC. Effects of dexamethasone on peripheral blood mononuclear cell phenotype in weanling piglets. Comp Immunol Microbiol Infect Dis 2005; 28:251-8. [PMID: 15896844 DOI: 10.1016/j.cimid.2005.03.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/07/2005] [Indexed: 11/29/2022]
Abstract
The aim of this study was to evaluate the effect of dexamethasone treatment on the immune system of weanling piglets. Piglets were administered dexamethasone (DEX; 1mg/kg, IM) every 12h for 2 consecutive days (short-term experiment) or DEX (1mg/kg, IM) daily for 2 weeks (long-term experiment). The relative percentage of CD8(+) T cells in peripheral blood mononuclear cells (PBMCs) was significantly decreased (P<0.05) in both short- and long-term DEX-treated groups compared to their control groups. The percentage of IgM(+) cells in PBMCs of the long-term DEX-treated group was greatly increased (P<0.05) in comparison to the control group. The results of this study indicate that short-term DEX-treatment increases leucocyte function; however, long-term DEX-treatment depresses leucocyte function, especially that of CD8(+) T cells.
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Affiliation(s)
- D Y Lo
- Graduate Institute of Veterinary Pathology, College of Veterinary Medicine, National Chung Hsing University, 250 Kuo Kuang Rd, Taichung 402, Taiwan, ROC
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Psarra AMG, Solakidi S, Trougakos IP, Margaritis LH, Spyrou G, Sekeris CE. Glucocorticoid receptor isoforms in human hepatocarcinoma HepG2 and SaOS-2 osteosarcoma cells: presence of glucocorticoid receptor alpha in mitochondria and of glucocorticoid receptor beta in nucleoli. Int J Biochem Cell Biol 2005; 37:2544-58. [PMID: 16076561 DOI: 10.1016/j.biocel.2005.06.015] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2005] [Revised: 06/20/2005] [Accepted: 06/28/2005] [Indexed: 11/24/2022]
Abstract
In the context of a possible direct action of glucocorticosteroids on mitochondrial transcription and/or apoptosis by way of cognate mitochondrial receptors, the possible localization of glucocorticoid receptors alpha and beta (GRalpha and GRbeta) in mitochondria was explored in human hepatocarcinoma HepG2 and osteosarcoma SaOS-2 cells, in which glucocorticoids exert an anabolic and apoptotic effect, respectively. In both cell types, GRalpha was detected in mitochondria, in nuclei and in cytosol by immunofluorescence labeling and confocal scanning microscopy, by immunogold electron microscopy and by Western blotting. GRbeta was shown to be almost exclusively restricted to the nucleus of the two cell types, being particularly concentrated in nucleoli, pointing to a solely nuclear role of this receptor isoform and to a possible function in nucleoli related processes. Computer analysis identified a putative internal mitochondrial targeting sequence within the glucocorticoid receptor. The demonstration of mitochondrially localized GRalpha in HepG2 and SaOS-2 cells corroborates previous findings in other cell types and further supports a direct role of this receptor in mitochondrial functions.
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Affiliation(s)
- Anna-Maria G Psarra
- Foundation for Biomedical Research of the Academy of Athens, Center for Basic Research, 4 Soranou Efesiou, 11527 Athens, Greece
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Nickel P, Kreutzer S, Bold G, Friebe A, Schmolke K, Meisel C, Jurgensen JS, Thiel A, Wernecke KD, Reinke P, Volk HD. CD31+ naïve Th cells are stable during six months following kidney transplantation: implications for post-transplant thymic function. Am J Transplant 2005; 5:1764-71. [PMID: 15943637 DOI: 10.1111/j.1600-6143.2005.00924.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Little is known about thymus function in transplant patients. Until recently, the phenotype of T cells that recently emigrated the thymus was unknown. Now it has been demonstrated that CD4(+) recent thymus emigrants coexpress CD31 and CD45RA. Here, we investigated whether uremia and immunosuppression influence CD31(+) CD45RA(+) Th cells before and after kidney transplantation, respectively. Forty-eight renal transplant patients were included receiving either standard triple/quadruple (n = 35) immunosuppression, OKT-3 induction (n = 7) or FTY-720 (n = 6), respectively. Peripheral CD31(+) CD45RA(+) Th cells were quantified flowcytometrically before and at week 1, 4, 12 and 24 post-transplantation. Thirty-nine healthy adults served as controls. CD31(+) CD45RA(+) Th cells correlated inversely with age in patients and controls and were comparable in patients before transplantation and age-matched controls. Importantly, CD31(+) CD45RA(+) Th cell frequencies remained stable during 6 months post-transplantation. In conclusion, CD31(+) CD45RA(+) Th cells are not significantly altered by uremia before and during 6 months of immunosuppressive therapy after kidney transplantation. Implications for thymus function are discussed.
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Affiliation(s)
- Peter Nickel
- Department of Nephrology and Intensive Care, Campus Virchow, Charité-University Medicine Berlin, Germany.
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Igarashi H, Medina KL, Yokota T, Rossi MID, Sakaguchi N, Comp PC, Kincade PW. Early lymphoid progenitors in mouse and man are highly sensitive to glucocorticoids. Int Immunol 2005; 17:501-11. [PMID: 15746243 DOI: 10.1093/intimm/dxh230] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Glucocorticoids are extensively used in anti-inflammatory therapy and may contribute to the normal regulation of lymphopoiesis. This study utilized new information about the early stages of lymphopoiesis in mouse and man to determine precisely which cell types are hormone sensitive. Cycling B lineage precursors were depleted in dexamethasone-treated mice, while mature, non-dividing CD45R(Hi) CD19(Hi) lymphocytes, myeloid progenitors and stem cells with the potential for lymphocyte generation on transplantation were spared. Lineage marker-negative (Lin(-)) IL-7R(+) Flk-2(+) pro-lymphocytes also declined, but not as rapidly as the terminal deoxynucleotidyl transferase-positive cells within an early Lin(-) c-kit(Hi) Sca-1(Hi) fraction of bone marrow. Hormone-sensitive cells with additional properties of early lymphoid progenitors (ELP) were identified within the same Lin(-) c-kit(Hi) Sca-1(Hi) subset using human mu transgenic mice and recombination-activating gene 1 (RAG1)/green fluorescent protein knock-in animals. Furthermore, cells with a recent history of RAG1 expression were more glucocorticoid sensitive than mature lymphocytes in marrow and spleen. Lymphocyte progenitors in mice bearing a human bcl-2 transgene were protected from dexamethasone treatment. However, isolated progenitors from either wild-type or bcl-2 transgenic mice were directly sensitive to the hormone in stromal cell-free cultures, suggesting that additional factors must determine vulnerability to glucocorticoids. B lineage lymphocyte precursors were found to be abnormally elevated in the bone marrow of adrenalectomized or RU486-treated mice. This suggests that glucocorticoids may normally contribute to steady-state regulation of lymphopoiesis. Finally, parallel studies revealed that the earliest events in human lymphopoiesis are susceptible to injury during glucocorticoid therapy.
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Affiliation(s)
- Hideya Igarashi
- Immunobiology and Cancer Program, Oklahoma Medical Research Foundation, 825 Northeast 13th Street, Oklahoma City, OK 73104, USA
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Cima I, Corazza N, Dick B, Fuhrer A, Herren S, Jakob S, Ayuni E, Mueller C, Brunner T. Intestinal epithelial cells synthesize glucocorticoids and regulate T cell activation. ACTA ACUST UNITED AC 2004; 200:1635-46. [PMID: 15596520 PMCID: PMC2211994 DOI: 10.1084/jem.20031958] [Citation(s) in RCA: 142] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Glucocorticoids (GCs) are important steroid hormones with widespread activities in metabolism, development, and immune regulation. The adrenal glands are the major source of GCs and release these hormones in response to psychological and immunological stress. However, there is increasing evidence that GCs may also be synthesized by nonadrenal tissues. Here, we report that the intestinal mucosa expresses steroidogenic enzymes and releases the GC corticosterone in response to T cell activation. T cell activation causes an increase in the intestinal expression of the steroidogenic enzymes required for GC synthesis. In situ hybridization analysis revealed that these enzymes are confined to the crypt region of the intestinal epithelial layer. Surprisingly, in situ-produced GCs exhibit both an inhibitory and a costimulatory role on intestinal T cell activation. In the absence of intestinal GCs in vivo, activation by anti-CD3 injection resulted in reduced CD69 expression and interferon-gamma production by intestinal T cells, whereas activation by viral infection led to increased T cell activation. We conclude that the intestinal mucosa is a potent source of immunoregulatory GCs.
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Affiliation(s)
- Igor Cima
- Div. of Immunopathology, Institute of Pathology, PO Box 62, Murtenstrasse 31, 3010 Bern, Switzerland
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Franchimont D. Overview of the actions of glucocorticoids on the immune response: a good model to characterize new pathways of immunosuppression for new treatment strategies. Ann N Y Acad Sci 2004; 1024:124-37. [PMID: 15265777 DOI: 10.1196/annals.1321.009] [Citation(s) in RCA: 273] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Glucocorticoids have been used for over 50 years in the treatment of inflammatory and autoimmune diseases and in preventing graft rejection. Today, knowledge of their molecular, cellular, and pharmacological properties allows a better understanding of glucocorticoid-mediated immunosuppression. Glucocorticoids exert both negative and positive effects with a dynamic and bi-directional spectrum of activities on various limbs and components of the immune response. They modulate genes involved in the priming of the innate immune response, while their actions on the adaptive immune response are to suppress cellular (Th1) immunity and promote humoral (Th2) immunity. Interestingly, glucocorticoids can also induce tolerance to specific antigens by influencing dendritic cell maturation and function and promoting the development of regulatory high IL-10-producing T cells. The ex vivo therapeutic use of glucocorticoids could therefore represent an adjuvant treatment to cell therapy in autoimmune diseases, avoiding the long-term deleterious adverse effects of glucocorticoids. Thus, the panoramic view of glucocorticoid actions on the immune system provides an interesting model for characterizing important biological pathways of immunosuppression.
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Affiliation(s)
- D Franchimont
- Department of Gastroenterology, Erasme University Hospital, Free University of Brussels, 808, Lennik Road, 1070 Brussels, Belgium.
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Abstract
Within the last 5 years, dramatic changes in the area of renal transplantation have occurred. There have been shifts in the dominant types of rejection, and in the types and utilization of immunosuppressants. Hyperacute rejection is now rarely seen, and acute cellular rejection within the first 6 to 12 months has been reduced to about 10%. However, humoral/antibody-mediated rejection has become a more prevalent problem. In the area of immunosuppressants, the ability to reduce acute cellular rejection to about 10% has been achieved through more judicious use of calcineurin inhibitors (cyclosporine and tacrolimus), increased use of mycophenolate mofetil, and the recent introduction of sirolimus (rapamycin). The polyclonal antibody (antithymocyte globulin), as well as monoclonal antibodies directed against the alpha chain of CD25 (daclizumab and basilixamab), have added substantially to the improved success of renal allografts. Because of numerous serious toxicities from glucocorticoids and calcineurin inhibitors, particularly cyclosporine, new studies are utilizing calcineurin-free and/or glucocorticoid avoidance or rapid elimination protocols often in combination with a monoclonal antibody and sirolimus. New immunosuppressants such as FTY720 and Campath-1 are also under study. In addition to its use in treating patients with low-level donor-specific antibody before transplantation in order to avoid hyperacute rejection, apheresis is utilized in various combination protocols after transplantation in the management of humoral/antibody-mediated rejection, in the treatment of hemolytic uremia syndrome that sometimes occurs with calcineurin inhibitors and sirolimus, as well as in the treatment of focal segmental glomerulosclerosis that has a major risk of recurrence in renal transplants.
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Affiliation(s)
- William E Braun
- Department of Nephrology and Hypertension, Consultant Organ Transplantation, Cleveland Clinic Foundation, Cleveland, Ohio 44195, USA.
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Maxwell JR, Rossi RJ, McSorley SJ, Vella AT. T cell clonal conditioning: a phase occurring early after antigen presentation but before clonal expansion is impacted by Toll-like receptor stimulation. THE JOURNAL OF IMMUNOLOGY 2004; 172:248-59. [PMID: 14688332 DOI: 10.4049/jimmunol.172.1.248] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
After in vivo immunization, Ag-specific T cells disappear from circulation and become sequestered in lymphoid tissue where they encounter Ag presented by dendritic cells. In the same site and just after Ag presentation, they "disappear" a second time and we investigated this process. Using a mouse model of T cell deletion (without Toll-like receptor (TLR) stimulation) vs survival (with TLR stimulation), Ag-specific T cells indeed became undetectable by flow cytometry, however were readily detected by immunohistochemistry. Thus, whether or not the activated T cells were destined to delete or survive, they were difficult to extract from lymphoid tissue and did not disappear but in fact were abundantly present. Nevertheless, profound differences were observed during this time period when tolerizing conditions were compared with immunizing conditions. TLR stimulation induced an increase in CD25 expression, acquisition of surface MHC class II, and abnormally high increases in forward and side scatter of the peptide-specific T cells. Using a modified adoptive transfer approach, we demonstrated by flow cytometry that in the presence of TLR stimulation the Ag-specific T cells were tightly coupled to dendritic cells, explaining the unusual increases in size and granularity. Ultimately, these events induced the specific T cells to differentiate into memory cells. We postulate that this is a stage where T cells are either conditioned to survive or to delete depending upon the activation status of the innate immune system.
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Affiliation(s)
- Joseph R Maxwell
- Division of Immunology, University of Connecticut Health Center, 263 Farmington Avenue, Farmington, CT 06032, USA
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Abstract
Treating inflammation in the equine gastrointestinal tract remains a challenge. Our most potent anti-inflammatory drugs, COX inhibitors and glucocorticoids, have unwanted effects on the gastrointestinal tract and host defense that often limit their use. Newer strategies targeting specific cells and molecules that regulate a subset of the events occurring during inflammation are rapidly becoming available and should allow clinicians to reduce the detrimental effects of inflammation without inhibiting the beneficial aspects.
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Affiliation(s)
- Samuel L Jones
- Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, 4700 Hillsborough Street, Raleigh, NC 27606, USA.
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Bishayi B, Ghosh S, Bhanja P. Effect of adrenalectomy on rat peritoneal macrophage response. ACTA BIOLOGICA HUNGARICA 2004; 54:335-46. [PMID: 14711037 DOI: 10.1556/abiol.54.2003.3-4.11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Glucocorticoid hormones are important for vital functions and act to modulate inflammatory and immune responses. In contrast to other hormonal systems no endogenous mediators have been identified that can directly counter-regulate their potent anti-inflammatory and immunosuppressive properties. Glucocorticoids are known to interfere with the ability of the macrophage not only to induce and amplify an immune response but also to inhibit macrophage inflammatory effector functions. Although the actual immunocompetence of animals undergoing endocrine gland ectomy has never been directly studied, there is no doubt that adrenal hormones are deeply involved in the development and maintenance of the immunitory functions and this may in turn influence the inflammatory reaction. To study the effect of endogenous glucocorticoids on the functions of rat peritoneal macrophages and induction of humoral immune response we observed some of the rat peritoneal macrophage effector functions, provided that endogenous glucocorticoids are depicted by adrenalectomy. The mean phagocytic index (PI) of control macrophage (Mphi) is increased from 23,825 +/- 427 to 31,895 +/- 83 after adrenalectomy (P < or = 0.001). Intracellular killing capacity in control cell is 82% which is found to be 73% in case of adrenalectomised cell (p < 0.05). The amount of nitric oxide released from control Mphi 20.25 +/- 1 microM following adrenalectomy shows the amount of nitric oxide release was 18.25 microM (p < or = 0.01 ). The percentage of DNA fragmentation in control Mphi was 68.82 +/- 4 which was reduced to 56.76 +/- 1 after adrenalectomy (p < or = 0.01). In sheep red blood cell (SRBC) immunised and adrenalectomised animal, agglutination titre was obtained at lowest antibody concentration (1 : 128) whereas serum from SRBC immunised normal rats showed early agglutination (1: 32). Endogenous glucocorticoid depleted rats show enhanced phagocytic capacity, antibody raising capacity as well as on the other hand adrenal hormone insufficiency reduces the intracellular killing capacity, nitric oxide (NO) release, improper cell maturation and heightens the probability of infection. These observations demonstrate a counter-regulatory system via glucocorticoid that functions to control inflammatory and immune responses.
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Affiliation(s)
- B Bishayi
- Immunology Laboratory, Department of Physiology, University of Calcutta, 92 A.P.C. Road, Calcutta-700 009, India.
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Pacheco-López G, Niemi MB, Kou W, Härting M, Del Rey A, Besedovsky HO, Schedlowski M. Behavioural endocrine immune-conditioned response is induced by taste and superantigen pairing. Neuroscience 2004; 129:555-62. [PMID: 15541877 DOI: 10.1016/j.neuroscience.2004.08.033] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/09/2004] [Indexed: 11/17/2022]
Abstract
Administration of bacterial superantigen, such as staphylococcal enterotoxin B (SEB), induces in vivo stimulation of T cell proliferation and cytokine production such as interleukin-2 (IL-2). It has been previously reported that SEB administration induces fever, c-Fos expression in the brain, and hypothalamus-pituitary-adrenal axis activation, demonstrating that the brain is able to sense and respond to SEB. Previously it had been shown that immune functions can be behaviourally conditioned pairing a novel gustatory stimulus together with an immunomodulatory drug or an antigen. We designed an experimental protocol using Dark Agouti rats in which saccharin taste, as conditioned stimulus, was paired with an i.p. injection of SEB (2 mg/kg), as unconditioned stimulus. Six days later, when conditioned animals were re-exposed to the conditioned stimulus they displayed strong conditioned taste avoidance to the saccharin. More importantly, re-exposure to the conditioned stimulus significantly increased IL-2, interferon-gamma and corticosterone plasma levels, in comparison with conditioned animals which had not been re-exposed to saccharin taste. These results demonstrate a behavioural-immune-endocrine conditioned response using a superantigen as unconditioned stimulus. In addition, they illustrate the brain abilities to mimic the unconditioned effects of a superantigen by yet unknown mechanisms.
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Affiliation(s)
- G Pacheco-López
- Department of Medical Psychology, IG-1, Medical Faculty, University Duisburg-Essen, Hufelandstrasse 55, 45122 Essen, Germany.
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Rossi-George A, LeBlanc F, Kaneta T, Urbach D, Kusnecov AW. Effects of bacterial superantigens on behavior of mice in the elevated plus maze and light-dark box. Brain Behav Immun 2004; 18:46-54. [PMID: 14651946 DOI: 10.1016/s0889-1591(03)00087-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Bacterial superantigens, such as staphylococcal enteroxins A and B (SEA/SEB) stimulate T cells to produce high levels of cytokines in blood. Previously it had been shown that these toxins were capable of stimulating increased neuroendocrine activity and enhanced behavioral reactivity to novel gustatory and non-gustatory stimuli. Therefore, it was suggested that these superantigens may promote anxiety-like behavior. In the current set of experiments, BALB/cByJ and C57BL/6J male mice were challenged with either SEB (50 microg) or SEA (5 or 10 microg) and tested for behavior in the elevated plus maze (EPM). Results suggested an absence of increased anxiety-like behavior, with exploration of the open arms being enhanced by SEA or SEB treatment. In another test of anxiety, the light-dark box, SEB challenge of BALB/cByJ mice 90 min prior to testing, did not alter exit latency, activity nor time spent in the dark. However, in a second experiment, it was found that if animals were first tested for consumption, followed by testing in the light-dark box, SEB challenged animals displayed increased exit latency and reduced exploration. These studies suggest that in standard tests of rodent anxiety-like behavior, evidence for the induction of anxiety-like processes subsequent to challenge with SEA or SEB is not patently discernable. However, neurobiological events induced by immunological challenge might synergize with reactivity to psychogenic and/or gustatory stimuli, thereby resulting in increased anxiety-like behavior that could be unmasked by standard behavioral tests such as the light-dark box or EPM.
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Affiliation(s)
- Alba Rossi-George
- Department of Psychology, Biopsychology and Behavioral Neuroscience Program, Rutgers, The State University of New Jersey, Piscatway, NJ, USA
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44
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Bishayi B, Ghosh S. Metabolic and immunological responses associated with in vivo glucocorticoid depletion by adrenalectomy in mature Swiss albino rats. Life Sci 2003; 73:3159-74. [PMID: 14550855 DOI: 10.1016/j.lfs.2003.06.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The study is undertaken to determine the effect of adrenal corticosteroid depletion after adrenalectomy on carbohydrate, protein and fat metabolism as well as maturation and functional efficacy of the immunocompetent cells. Beside biochemical and hematological parameters, whether in vivo glucocorticoid depletion has any modulatory effects on splenic macrophage responses to bacterial challenge with regards to intracellular killing, nitric oxide release and cellular integrity, were determined. Major findings of our study indicate that blood glucose, urea and total inorganic phosphate levels showed a time dependent increase in adrenalectomized rats compared to control. Total glycogen content in liver was decreased gradually due to adrenal corticosteroid insufficiency. Hematological parameters like hemoglobin concentration, hematocrit value, total leukocyte count and differential count were also found to increase in the adrenalectomized group with respect to intact group. From the functional study of immunocompetent cells, intracellular killing capacity of splenic macrophages recovered from control and adrenalectomized rats after 10 and 20 days of adrenalectomy showed no significant alteration; however, the function of splenic macrophages recovered from rats after 30 days of adrenalectomy showed altered response. Nitric oxide released from splenic macrophages of adrenalectomized rats was less than that of control animal even after stimulation with lipopolysaccharide. DNA fragmentation assay showed a lesser degree of fragmentation of splenic macrophages obtained from adrenalectomized rats indicating, apoptotic death of cells in this group decreases. Adrenal corticosteroid insufficiency due to adrenalectomy interferes with metabolic and hematopoietic functions and modulates the development and maintenance of normal immunitary status, which in turn influences the inflammatory response.
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Affiliation(s)
- B Bishayi
- Immunology Laboratory, Department of Physiology, University Colleges of Science and Technology, University of Calcutta, 92, APC Road, Kolkata-700009, West Bengal, India.
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45
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Paiva CN, Pyrrho AS, Lannes-Vieira J, Vacchio M, Soares MBP, Gattass CR. Trypanosoma cruzi sensitizes mice to fulminant SEB-induced shock: overrelease of inflammatory cytokines and independence of Chagas' disease or TCR Vbeta-usage. Shock 2003; 19:163-8. [PMID: 12578126 DOI: 10.1097/00024382-200302000-00013] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Trypanosoma cruzi-infected mice display increased susceptibility to shock induced by injection of lipopolysaccharide (LPS), anti-CD3, or resulting from interleukin (IL)-10-defective response to the parasite itself, but the basis of such susceptibility remains unknown. Herein, we tested the susceptibility of mice inoculated with virulent and avirulent T. cruzi to staphylococcal enterotoxins (SE), potent inducers of inflammatory cytokine secretion. Mice infected with T. cruzi CL-strain or inoculated with the avirulent clone CL-14, a clone that does not induce disease or polyclonal lymphocyte activation, succumb suddenly to low doses of staphylococcal enterotoxin B (SEB), but not to staphylococcal enterotoxin A (SEA). High plasma levels of TNF, IFN-gamma, and liver transaminases alanine aminotransferase (ALT) and aspartate aminotransferase (AST) were found in these mice, indicating lethal toxic shock. Sensitization to shock required inoculation of live avirulent trypomastigotes and a time interval before challenge with SEB. We found no prior skewing of T cell receptor (TCR) Vbeta-repertoire in CL-14-inoculated mice that could be responsible for sensitization. Splenocytes from CL-14-inoculated mice proliferated more under anti-Vbeta8 than anti-TCRbeta stimulation when compared with normal mice, but were suppressed to SEB stimulation. Both SEB and anti-Vbeta8 antibodies stimulated splenocytes from T. cruzi-inoculated mice to secrete higher levels of inflammatory cytokines than normal controls. Taken together, our results show that T. cruzi inoculation can sensitize mice to lethal SEB-induced shock even in the absence of tissue damage, polyclonal lymphocyte activation, or previously increased levels of inflammatory cytokines, and they suggest that altered reactivity of Vbeta8 lymphocytes may be involved in the phenomenon.
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Affiliation(s)
- Cláudia N Paiva
- Laboratório de Imunoparasitologia, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, RJ, Brasil 21949-900
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Gollapudi S, Jaidka S, Gupta S. Molecular basis of rifampicin-induced inhibition of anti-CD95-induced apoptosis of peripheral blood T lymphocytes: the role of CD95 ligand and FLIPs. J Clin Immunol 2003; 23:11-22. [PMID: 12645856 DOI: 10.1023/a:1021944113833] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Rifampicin modulates immune response; however, mechanisms by which it exerts these effects are incompletely understood. Recently, rifampicin has been shown to bind to and activate glucocorticoid receptors. Because of the evidence for a role of glucocorticoids in lymphocyte apoptosis, we hypothesized that rifampicin may exert its influence on the immune system by regulating apoptosis. Therefore, we examined the effect of rifampicin on signaling pathway of anti-CD95-induced apoptosis in peripheral blood lymphocytes. Rifampicin, in a concentration-dependent manner, inhibited anti-CD95-induced apoptosis in both CD4+ and CD8+ T cells, which was associated with the inhibition of activation of both caspase-3 and caspase-8. In addition, rifampicin down-regulated the expression of CD95L and Bax. The inhibitory effects of rifampicin on apoptosis and caspase activation as well as its effect on the expression of CD95L and FLIPs were reversed by RU486, an antagonist of glucocorticoid receptor. These data suggest that rifampicin inhibits anti-CD95-mediated apoptosis in lymphocytes by modulating the expression of certain proteins that regulate apoptosis, at least in part, via glucocorticoid receptors.
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Affiliation(s)
- Sastry Gollapudi
- Laboratory of Cellular Immunology, Division of Basic and Clinical Immunology, University of California, Irvine, California 92697, USA.
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47
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Kawashima N, Fugate J, Kusnecov AW. Immunological challenge modulates brain orphanin FQ/nociceptin and nociceptive behavior. Brain Res 2002; 949:71-8. [PMID: 12213301 DOI: 10.1016/s0006-8993(02)02966-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Orphanin FQ/Nociceptin (OFQ/N), an endogenous peptide found throughout the central nervous system, has been attributed with a wide range of functions, including modulation of motivational and emotional behavior, but most prominently, facilitation of hyperalgesia. It has also been shown that brain OFQ/N is stimulated during locally-induced peripheral inflammation, a condition well known to increase pain sensitivity. However, few studies have addressed whether specific immunological challenge using T-cell dependent and independent stimuli alters OFQ/N gene activation in the brain. Consequently, male C57BL/6J mice were challenged with 5 microg of lipopolysaccharide (LPS) or a T-cell-activating bacterial superantigen, Staphyloccocal enterotoxin A (SEA), and levels of brain OFQ/N precursor, pNOC, mRNA were analyzed by semi-quantitative RT-PCR. In addition, nociceptive thresholds were examined in immunologically challenged mice using the hotplate test. Initial results on a combined region of the brain containing various limbic components, revealed increased levels of pNOC mRNA in response to SEA challenge, but not to LPS. Further analysis of more discrete brain regions revealed increased pNOC mRNA in the hypothalamus and amygdala in response to SEA. Interestingly, challenge with SEA, but not LPS, significantly reduced hindpaw-lick latency in the hot plate test, although this effect was observed only if the hotplate environment was unfamiliar, suggesting an interaction between immunological stimulation and novelty-induced stress. Since SEA induces various cytokines, including TNF-alpha, these results are consistent with a growing literature documenting the effects of cytokines on nociceptive functions, and a possible involvement of the OFQ/nociceptin system.
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Affiliation(s)
- Noriko Kawashima
- Biopsychology and Behavioral Neuroscience Program, Department of Psychology, Rutgers, The State University of New Jersey-New Brunswick, Piscataway, NJ, USA
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Martínez-Taboada V, Bartolomé MJ, Amado JA, Blanco R, García-Unzueta MT, Rodríguez-Valverde V, López-Hoyos M. Changes in peripheral blood lymphocyte subsets in elderly subjects are associated with an impaired function of the hypothalamic-pituitary-adrenal axis. Mech Ageing Dev 2002; 123:1477-86. [PMID: 12425955 DOI: 10.1016/s0047-6374(02)00116-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
A growing body of evidence indicates that ageing brings a progressive disruption in the immune and endocrine systems. However, very few reports have correlated the changes in the immune system with the endocrine function in the elderly. The aim of the present study was to investigate the changes occurring in the peripheral blood lymphocyte subpopulations with age and correlate them with the hypothalamic-pituitary-adrenal (HPA) function. We determined the peripheral blood lymphocyte phenotype and the T cell receptor usage by flow cytometry analysis. The HPA function was evaluated by the basal serum levels of adrenal steroids and the response to stimulation with a low-dose ACTH. In the elderly, we observed a decrease of major T subsets together with an increase of NK cells and activated T cells. With regard to the HPA function, the most significant decline was found in dehydroepiandrosterone (DHEA) and dehydroepiandrosterone-sulphate (DHEAS). A close correlation between immune changes with ageing and DHEA response to ACTH stimulation was found. The present study showed an inverse correlation of lymphocyte changes with the plasma levels of steroids, especially DHEA and its metabolite, DHEAS. This association was not found for other steroids and points for the possibility of using DHEA to correct the immunological decline associated with ageing.
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del Rey A, Kabiersch A, Petzoldt S, Besedovsky HO. Involvement of noradrenergic nerves in the activation and clonal deletion of T cells stimulated by superantigen in vivo. J Neuroimmunol 2002; 127:44-53. [PMID: 12044974 DOI: 10.1016/s0165-5728(02)00096-6] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Superantigens, like staphylococcal enterotoxin B (SEB), induce a strong proliferative response followed by clonal deletion of a substantial portion of defined Vbeta T cells. The remaining cells display in vitro anergy. We found that the immune response to SEB was paralleled by biphasic changes in the activity of the sympathetic nervous system. Furthermore, sympathetic denervation resulted in decreased SEB-induced cell proliferation and IL-2 production, and impeded the specific deletion of splenic CD4Vbeta8 cells observed in intact animals without affecting anergy. These studies provide the first evidence of an immunoregulatory cross-talk between sympathetic nerves and superantigen-activated immune cells.
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Affiliation(s)
- Adriana del Rey
- Department of Immunophysiology, Institute of Physiology, Medical Faculty, Deutschhausstrasse 2, 35037 Marburg, Germany.
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Islam Z, Moon YS, Zhou HR, King LE, Fraker PJ, Pestka JJ. Endotoxin potentiation of trichothecene-induced lymphocyte apoptosis is mediated by up-regulation of glucocorticoids. Toxicol Appl Pharmacol 2002; 180:43-55. [PMID: 11922776 DOI: 10.1006/taap.2002.9374] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Exposure to bacterial endotoxin (lipopolysaccharide, LPS) is quite common and may increase human susceptibility to chemical-induced tissue injury. The purpose of this study was to identify mechanisms by which LPS potentiates lymphoid tissue depletion in B6C3F1 mice exposed to the common food-borne trichothecene mycotoxin, vomitoxin (VT). As demonstrated by DNA fragmentation and flow cytometric analysis, apoptosis in thymus, Peyer's patches, and bone marrow was marked in mice 12 h after administering Escherichia coli LPS (0.1 mg/kg body wt ip) concurrently with VT (12.5 mg/kg body wt po), whereas apoptosis in control mice or mice treated with either toxin alone was minimal. Based on observed increases in tumor necrosis factor-alpha (TNF-alpha) and interleukin (IL)-6 serum concentrations following LPS and VT cotreatment, the roles of these cytokines in apoptosis potentiation were assessed. Injection with rolipram, an inhibitor of TNF-alpha expression, or use of IL-6 knockout mice was ineffective at impairing thymic apoptosis induction by the toxin cotreatment, suggesting that these cytokines did not mediate LPS potentiation. Toxin cotreatment increased splenic cyclooxygenase-2 mRNA expression, suggesting possible involvement of prostaglandins in apoptosis. However, indomethacin, a broad spectrum inhibitor of cyclooxygenases, failed to block thymus apoptosis. Toxin cotreatment increased serum corticosterone and, furthermore, RU 486, a glucocorticoid receptor antagonist, significantly abrogated apoptosis in thymus, Peyer's patches, and bone marrow following LPS + VT exposure. The results presented herein and the known capacity of glucocorticoids to cause apoptosis indicate that hypothalamic-pituitary-adrenal axis plays a key role in LPS potentiation of trichothecene-induced lymphocyte apoptosis.
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Affiliation(s)
- Zahidul Islam
- Department of Food Science and Human Nutrition, Michigan State University, East Lansing, Michigan 48824-1224, USA
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