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Functional aspects of T cell diversity in visceral leishmaniasis. Biomed Pharmacother 2019; 117:109098. [DOI: 10.1016/j.biopha.2019.109098] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Revised: 06/04/2019] [Accepted: 06/04/2019] [Indexed: 01/14/2023] Open
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2
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Huo C, Xiao C, She R, Liu T, Tian J, Dong H, Tian H, Hu Y. Chronic heat stress negatively affects the immune functions of both spleens and intestinal mucosal system in pigs through the inhibition of apoptosis. Microb Pathog 2019; 136:103672. [PMID: 31442574 DOI: 10.1016/j.micpath.2019.103672] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Revised: 08/13/2019] [Accepted: 08/19/2019] [Indexed: 12/28/2022]
Abstract
With the globe warming, chronic heat stress (CHS) has been considered to be a common hazard that could negatively affect pig's growth and reproduction performance. However, the effects of CHS on the immune functions of pigs were seldom reported, especially the cellular immune functions of intestinal mucosal system. In order to resolve this problem, a pig CHS model was built firstly and the effects of CHS on numbers of T cells in spleen and small intestines were observed. Exposure to a temperature of 39 °C, 4 h/d for 10d, the expression of heat stress protein 70 (HSP70) was increased dramatically. Under CHS condition, the numbers of CD3+ T cells were increased dramatically in both spleens and small intestines. Besides, the numbers of CD4+T cells and the value of CD4+/CD8+T cells in spleens were also significantly increased. The results highly revealed that CHS made the equilibrium state of immune function destroyed. Furthermore, CHS mainly promoted the expression of anti-apoptosis factor B cell lymphoma-2 (Bcl-2) and thus inhibited the apoptosis of lymphocytes in spleens and intestinal mucosa. This study demonstrates for the first time that CHS negatively affects the immune functions of both spleens and intestinal mucosal system in pigs through the inhibition of apoptosis. Our study can richer the data for study of mechanism of CHS and provide new knowledge for reference of making new strategy to control the disease induced by CHS.
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Affiliation(s)
- Caiyun Huo
- Department of Veterinary Pathology, College of Veterinary Medicine, China Agricultural University, Beijing, PR China
| | - Chong Xiao
- Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, PR China
| | - Ruiping She
- Department of Veterinary Pathology, College of Veterinary Medicine, China Agricultural University, Beijing, PR China
| | - Tianlong Liu
- Department of Veterinary Pathology, College of Veterinary Medicine, China Agricultural University, Beijing, PR China
| | - Jijing Tian
- Department of Veterinary Pathology, College of Veterinary Medicine, China Agricultural University, Beijing, PR China
| | - Hong Dong
- Beijing Key Laboratory of Traditional Chinese Veterinary Medicine, Beijing University of Agriculture, Beijing, PR China
| | - Haiyan Tian
- Department of Veterinary Pathology, College of Veterinary Medicine, China Agricultural University, Beijing, PR China
| | - Yanxin Hu
- Department of Veterinary Pathology, College of Veterinary Medicine, China Agricultural University, Beijing, PR China.
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3
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Zhang J, Wan C, Yu B, Gao C, Zhao L, Cheng X, Yang F, Gu H, Zou Q, Gu J, Wang X. Prophylactic and therapeutic protection of human IgG purified from sera containing anti-exotoxin A titers against pneumonia caused by Pseudomonas aeruginosa. Hum Vaccin Immunother 2019; 15:2993-3002. [PMID: 31116632 PMCID: PMC6930096 DOI: 10.1080/21645515.2019.1619404] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Revised: 04/22/2019] [Accepted: 05/08/2019] [Indexed: 10/26/2022] Open
Abstract
Antibodies are effective alternative tools to combat infections caused by Pseudomonas aeruginosa (PA), especially multi-drug-resistant PA. Thus, to solve the urgent need for an anti-PA antibody drug, we hypothesized that anti-PA intravenous immunoglobulins could be a practical attempt. Exotoxin A (ETA) is one of the most important factors for PA infection and is also a critical target for the development of immune interventions. In this study, a total of 320 sera were collected from healthy volunteers. The concentration of ETA-specific antibodies was determined by a Luminex-based assay and then purified by affinity chromatography. The purified IgGs were able to neutralize the cytotoxicity of ETA in vitro. We showed they had a prophylactic and therapeutic protective effect in PA pneumonia and ETA toxemia models. In addition, administration of nonspecific IgGs also provided partial protection. Collectively, our results provide additional evidence for IVIG-based treatment of infections caused by multi-drug-resistant PA and suggest that patients at high risk of PA pneumonia could be prophylactically treated with anti-ETA IgGs or even with nonspecific IgGs.
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Affiliation(s)
- Jin Zhang
- Department of Pediatric Research Institute, Children’s Hospital of Chongqing Medical University, Chongqing, China
- China International Science and Technology Cooperation base of Child development and Critical Disorders, Chongqing, China
- Chongqing Key Laboratory of Pediatric, Children’s Hospital of Chongqing Medical University, Chongqing, China
| | - Chuang Wan
- National Engineering Research Center of Immunological Products, Department of Microbiology and Biochemical Pharmacy, College of Pharmacy, Third Military Medical University, Chongqing, PR China
| | - Bo Yu
- Department of Dermatology and Rheumatology Immunology, Xinqiao Hospital, Third Military Medical University, Chongqing, PR China
| | - Chen Gao
- National Engineering Research Center of Immunological Products, Department of Microbiology and Biochemical Pharmacy, College of Pharmacy, Third Military Medical University, Chongqing, PR China
| | - Liqun Zhao
- National Engineering Research Center of Immunological Products, Department of Microbiology and Biochemical Pharmacy, College of Pharmacy, Third Military Medical University, Chongqing, PR China
| | - Xin Cheng
- National Engineering Research Center of Immunological Products, Department of Microbiology and Biochemical Pharmacy, College of Pharmacy, Third Military Medical University, Chongqing, PR China
| | - Feng Yang
- National Engineering Research Center of Immunological Products, Department of Microbiology and Biochemical Pharmacy, College of Pharmacy, Third Military Medical University, Chongqing, PR China
| | - Hao Gu
- National Engineering Research Center of Immunological Products, Department of Microbiology and Biochemical Pharmacy, College of Pharmacy, Third Military Medical University, Chongqing, PR China
| | - Quanming Zou
- National Engineering Research Center of Immunological Products, Department of Microbiology and Biochemical Pharmacy, College of Pharmacy, Third Military Medical University, Chongqing, PR China
| | - Jiang Gu
- National Engineering Research Center of Immunological Products, Department of Microbiology and Biochemical Pharmacy, College of Pharmacy, Third Military Medical University, Chongqing, PR China
| | - Xingyong Wang
- Department of Pediatric Research Institute, Children’s Hospital of Chongqing Medical University, Chongqing, China
- China International Science and Technology Cooperation base of Child development and Critical Disorders, Chongqing, China
- Chongqing Key Laboratory of Pediatric, Children’s Hospital of Chongqing Medical University, Chongqing, China
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4
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João C, Negi VS, Kazatchkine MD, Bayry J, Kaveri SV. Passive Serum Therapy to Immunomodulation by IVIG: A Fascinating Journey of Antibodies. THE JOURNAL OF IMMUNOLOGY 2019; 200:1957-1963. [PMID: 29507120 DOI: 10.4049/jimmunol.1701271] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Received: 09/05/2017] [Accepted: 11/14/2017] [Indexed: 12/31/2022]
Abstract
The immunoregulatory and anti-infective properties of normal circulating polyclonal Abs have been exploited for the therapeutic purposes in the form of IVIG as well as several hyperimmune globulins. Current knowledge on the therapeutic use of normal Igs is based on the discoveries made by several pioneers of the field. In this paper, we review the evolution of IVIG over the years. More importantly, the process started as an s.c. replacement in γ globulin-deficient patients, underwent metamorphosis into i.m. Ig, was followed by IVIG, and is now back to s.c. forms. Following successful use of IVIG in immune thrombocytopenic purpura, there has been an explosion in the therapeutic applications of IVIG in diverse autoimmune and inflammatory conditions. In addition to clinically approved pathological conditions, IVIG has been used as an off-label drug in more than 100 different indications. The current worldwide consumption of IVIG is over 100 tons per year.
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Affiliation(s)
- Cristina João
- Hematology Department, Champalimaud Center for the Unknown, Lisbon 1400-038, Portugal.,Immunology Department, Nova Medical School, Nova University of Lisbon, Lisbon 1169-056, Portugal
| | - Vir Singh Negi
- Department of Clinical Immunology, Jawaharlal Institute of Postgraduate Medical Education and Research, Puducherry 605006, India
| | - Michel D Kazatchkine
- United Nations Special Envoy for AIDS in Eastern Europe and Central Asia, Geneva CH-1211, Switzerland
| | - Jagadeesh Bayry
- INSERM Unité 1138, Paris F-75006, France; .,Sorbonne Université, UMR S 1138, Paris F-75006, France.,Université Paris Descartes, Sorbonne Paris Cité, UMR S 1138, Paris F-75006, France; and.,Centre de Recherche des Cordeliers, Equipe-Immunopathologie et Immuno-Intervention Thérapeutique, Paris F-75006, France
| | - Srini V Kaveri
- INSERM Unité 1138, Paris F-75006, France; .,Sorbonne Université, UMR S 1138, Paris F-75006, France.,Université Paris Descartes, Sorbonne Paris Cité, UMR S 1138, Paris F-75006, France; and.,Centre de Recherche des Cordeliers, Equipe-Immunopathologie et Immuno-Intervention Thérapeutique, Paris F-75006, France
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5
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Martínez T, Garcia-Robledo JE, Plata I, Urbano MA, Posso-Osorio I, Rios-Serna LJ, Barrera MC, Tobón GJ. Mechanisms of action and historical facts on the use of intravenous immunoglobulins in systemic lupus erythematosus. Autoimmun Rev 2019; 18:279-286. [PMID: 30639648 DOI: 10.1016/j.autrev.2018.10.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Accepted: 10/14/2018] [Indexed: 12/29/2022]
Abstract
The current existing therapies for severe cases of systemic lupus erythematosus (SLE) patients are still limited. Intravenous immunoglobulin (IVIGs), which are purified from the plasma of thousands of healthy human donors, have been profiled as efficacious and life-saving options for SLE patients refractory to conventional therapy. The specific mechanism of action by which IVIGs generate immunomodulation in SLE is not currently understood. In this manuscript, we reviewed some of the hypothesis that have been postulated to explain the IVIG effects, including those on T and B cell intracellular signalling and activation, as well as the interferon signalling pathways involved in the detection of nucleic acids and the defective removal of immune complexes and debris.
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Affiliation(s)
- Tatiana Martínez
- GIRAT: Grupo de Investigación en Reumatología, Autoinmunidad y Medicina traslacional. Fundación Valle del Lili, Univesidad Icesi, Colombia
| | | | - Ilich Plata
- Medical School, Universidad Icesi, Cali, Colombia
| | | | - Ivan Posso-Osorio
- GIRAT: Grupo de Investigación en Reumatología, Autoinmunidad y Medicina traslacional. Fundación Valle del Lili, Univesidad Icesi, Colombia
| | - Lady J Rios-Serna
- GIRAT: Grupo de Investigación en Reumatología, Autoinmunidad y Medicina traslacional. Fundación Valle del Lili, Univesidad Icesi, Colombia
| | - María Claudia Barrera
- GIRAT: Grupo de Investigación en Reumatología, Autoinmunidad y Medicina traslacional. Fundación Valle del Lili, Univesidad Icesi, Colombia
| | - Gabriel J Tobón
- GIRAT: Grupo de Investigación en Reumatología, Autoinmunidad y Medicina traslacional. Fundación Valle del Lili, Univesidad Icesi, Colombia; Laboratory of immunology, Fundación Valle del Lili, Cali, Colombia.
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6
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Enlarged colitogenic T cell population paradoxically supports colitis prevention through the B-lymphocyte-dependent peripheral generation of CD4(+)Foxp3(+) Treg cells. Sci Rep 2016; 6:28573. [PMID: 27353032 PMCID: PMC4926115 DOI: 10.1038/srep28573] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Accepted: 06/03/2016] [Indexed: 01/07/2023] Open
Abstract
Intestinal inflammation can be induced by the reconstitution of T/B cell-deficient mice with low numbers of CD4+ T lymphocytes depleted of CD25+Foxp3+ regulatory T cells (Treg). Using RAG-knockout mice as recipients of either splenocytes exclusively depleted of CD25+ cells or FACS-purified CD4+CD25−Foxp3− T cells, we found that the augmentation of potentially colitogenic naïve T cell numbers in the inoculum was unexpectedly beneficial for the suppression of colon disease and maintenance of immune homeostasis. Protection against T cell-mediated colitis correlated with a significant increment in the frequency of peripherally-induced CD4+CD25+Foxp3+ T (pTreg) cells, especially in the mesenteric lymph nodes, an effect that required the presence of B cells and CD4+CD25−Foxp3+ cells in physiological proportions. Our findings support a model whereby the interplay between B lymphocytes and a diversified naïve T cell repertoire is critical for the generation of CD4+CD25+Foxp3+ pTreg cells and colitis suppression.
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Barahona Afonso AF, João CMP. The Production Processes and Biological Effects of Intravenous Immunoglobulin. Biomolecules 2016; 6:15. [PMID: 27005671 PMCID: PMC4808809 DOI: 10.3390/biom6010015] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2015] [Revised: 03/01/2016] [Accepted: 03/01/2016] [Indexed: 12/17/2022] Open
Abstract
Immunoglobulin is a highly diverse autologous molecule able to influence immunity in different physiological and diseased situations. Its effect may be visible both in terms of development and function of B and T lymphocytes. Polyclonal immunoglobulin may be used as therapy in many diseases in different circumstances such as primary and secondary hypogammaglobulinemia, recurrent infections, polyneuropathies, cancer, after allogeneic transplantation in the presence of infections and/or GVHD. However, recent studies have broadened the possible uses of polyclonal immunoglobulin showing that it can stimulate certain sub-populations of T cells with effects on T cell proliferation, survival and function in situations of lymphopenia. These results present a novel and considerable impact of intravenous immunoglobulin (IVIg) treatment in situations of severe lymphopenia, a situation that can occur in cancer patients after chemo and radiotherapy treatments. In this review paper the established and experimental role of polyclonal immunoglobulin will be presented and discussed as well as the manufacturing processes involved in their production.
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Affiliation(s)
- Ana Filipa Barahona Afonso
- Department of Chemistry, Universidade de Évora, Colégio Luís António Verney, Rua Romão Ramalho 59, 7000-671 Évora, Portugal.
| | - Cristina Maria Pires João
- Hematology Department, Champalimaud Center for the Unknown, Av. Brasília, 1400-038 Lisboa, Portugal.
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8
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Late Onset Combined Immunodeficiency Presenting with Recurrent Pneumocystis jiroveci Pneumonia. Case Rep Med 2014; 2014:801805. [PMID: 24799913 PMCID: PMC3988709 DOI: 10.1155/2014/801805] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2013] [Revised: 03/01/2014] [Accepted: 03/08/2014] [Indexed: 12/19/2022] Open
Abstract
Late onset combined immunodeficiency (LOCID) is a recently described variant of common variable immunodeficiency (CVID), involving adult patients presenting with opportunistic infections and/or low CD4+ lymphocyte counts. A 36-year-old male with unremarkable past medical history presented with fever, respiratory failure, and lymphocytopenia. He was found to have Pneumocystis jiroveci pneumonia (PJP), subsequently complicated by recurrent hospital-acquired Pseudomonas aeruginosa pneumonia and immune reconstitution phenomena, attributed to restoration of immunoglobulin levels. Clinicians should be aware of LOCID, which could be confused with HIV infection/AIDS or idiopathic CD4 lymphocytopenia. In the English bibliography there is only one case report, where PJP was the initial presentation of CVID (that case would probably be classified as LOCID). Phenomena of immune reconstitution are described in various settings, including primary immunodeficiency, manifesting as temporary clinical and radiologic deterioration and leading to misperceptions of therapeutic failure and/or presence of alternative/additional diagnoses.
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Costa N, Pires AE, Gabriel AM, Goulart LF, Pereira C, Leal B, Queiros AC, Chaara W, Moraes-Fontes MF, Vasconcelos C, Ferreira C, Martins J, Bastos M, Santos MJ, Pereira MA, Martins B, Lima M, João C, Six A, Demengeot J, Fesel C. Broadened T-cell Repertoire Diversity in ivIg-treated SLE Patients is Also Related to the Individual Status of Regulatory T-cells. J Clin Immunol 2012; 33:349-60. [DOI: 10.1007/s10875-012-9816-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2011] [Accepted: 10/02/2012] [Indexed: 12/14/2022]
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10
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Afonso AB, Justo LN, Queirós AC, Fesel C, Cabral MS, da Silva MG, Porrata L, Markovic S, Pires AE, João C. Treatment with low doses of polyclonal immunoglobulin improves B cell function during immune reconstitution in a murine model. J Clin Immunol 2012; 33:407-19. [PMID: 23054339 DOI: 10.1007/s10875-012-9802-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2012] [Accepted: 09/12/2012] [Indexed: 12/27/2022]
Abstract
PURPOSE [corrected] After autologous stem cell transplantation (ASCT) the immunological B cell compartment recovers slowly. Delays on the recovery of B cell function after autologous stem cell transplantation are due to the low lymphocytes count and to their intrinsic dysfunction. METHODS We studied the in vivo B cell reconstitution after ASCT examining the independent effect of polyclonal IgG (PolyIg), Fab or Fc fragments infusions in a murine animal model during a period of 12 weeks. These molecules were used in low doses, mimicking the recommended use of IVIg in the case of hypogammaglobulinemia in humans. Flow cytometry analysis and ELISA tests were conducted to monitor the reconstitution of B cells and serum immunoglobulin production. Panama blot and PCA factor 1 analysis were used to study the kinetics of immunoglobulin repertoires reconstitution. Mechanistic studies were also performed using in vitro cell culture. RESULTS During follow-up after ASCT, peripheral B cells expand independently of treatment, correcting the immediate increase in sBAFF (soluble B cell activating factor) induced by previous intense myeloablation. Treatments with Fab and Fc fragments infusions promote significant IgM and IgG production comparing to control. Although the complete recovery of antibody repertoire is only achieved at the end of follow-up after ASCT, there is an earlier and significantly stronger recovery in the treated mice, which is evident at 9 weeks after ASCT. At 30 weeks after ASCT, normal values of antibody repertoire were detected in all individuals. Mechanistic studies show that Fab and Fc fragments promote IgG1 production by indirect pathways. CONCLUSIONS The results presented here demonstrate that polyclonal immunoglobulin indirectly improves the function of the reconstituted B cells and their IgG production by means of Fc-mediated effects on bystander cells. These results further stimulate the discussion about the advantages of IVIg therapy during immune reconstitution after human ASCT.
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Affiliation(s)
- Ana Barahona Afonso
- CEDOC, Faculdade de Ciências Médicas, FCM, Universidade Nova de Lisboa, Lisbon, Portugal
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Luo W, Liao WJ, Huang YT, Shi M, Zhang Y, Wen Q, Zhou MQ, Ma L. Normalization of T cell receptor repertoire diversity in patients with advanced colorectal cancer who responded to chemotherapy. Cancer Sci 2011; 102:706-12. [DOI: 10.1111/j.1349-7006.2011.01868.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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12
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Treatment with polyclonal immunoglobulin during T-cell reconstitution promotes naive T-cell proliferation. J Immunother 2010; 33:618-25. [PMID: 20551835 DOI: 10.1097/cji.0b013e3181d3cb19] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Natural antibodies are unique self molecules endowed with both suppressive and activating functions on various cells of the immune system and are recognized as a fundamental link between the adaptive and innate immune system. Here, we examine the role of natural antibodies, using polyclonal immunoglobulins (Ig), as a promoter of T-cell reconstitution in a context of lymphopenia. We have established a mouse model to mimic immunologic recovery in adult patients with severe hypothymic function subjected to autologous hematopoietic precursor cell transplantation. Thymectomized mice were transplanted and treated with low doses of Ig or its Fab or Fc fragments. The animals displayed, during early phases of Ig treatment, a significant increase of T-cell reconstitution displaying a naive CD4(+) phenotype. In addition, the Ig-treated animals exhibited an increase dilution of single-joint T-cell receptor excision circles (sjTRECs) in peripheral blood, suggesting an early increase in proliferation of T cells stimulated by the natural antibodies. These results unveil a novel and considerable effect of intravenous Ig treatment in situations of severe lymphopenia as a stimulator of proliferation of peripheral naive T cells, possibly protecting diverse immune repertoires.
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Efficacy of ST-246 versus lethal poxvirus challenge in immunodeficient mice. Proc Natl Acad Sci U S A 2009; 107:838-43. [PMID: 20080762 DOI: 10.1073/pnas.0912134107] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The threat of smallpox as a bioweapon and the emerging threat of human monkeypox, among other poxviral diseases, highlight the need for effective poxvirus countermeasures. ST-246, which targets the F13L protein in vaccinia virus and its homologs in other orthopoxvirus species, provides full protection from lethal poxviral disease in numerous animal models and seems to be safe in humans. All previous evaluations of ST-246 efficacy have been in immunocompetent animals. However, the risk of severe poxviral disease is greater in immunodeficient hosts. Here we report on the efficacy of ST-246 in preventing or treating lethal poxviral disease in immunodeficient mice. After lethal challenge with the Western Reserve strain of vaccinia, Nude, SCID, and J(H) knockout mice additionally depleted of CD4(+) and CD8(+) T cells were not fully protected by ST-246, although survival was significantly extended. However, CD4(+) T cell deficient, CD8(+) T cell deficient, J(H) knockout, and J(H) knockout mice also deficient for CD4(+) or CD8(+) T cells survived lethal challenge when treated with ST-246 starting on the day of challenge. Delaying treatment until 72 h after infection reduced ST-246 efficacy in some models but provided full protection from lethal challenge in most. These findings suggest that ST-246 may be effective in controlling smallpox or other pathogenic orthopoxviruses in some immunodeficient human populations for whom the vaccine is contraindicated.
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Cardillo F, Postol E, Nihei J, Aroeira LS, Nomizo A, Mengel J. B cells modulate T cells so as to favour T helper type 1 and CD8+ T-cell responses in the acute phase of Trypanosoma cruzi infection. Immunology 2007; 122:584-95. [PMID: 17635611 PMCID: PMC2266037 DOI: 10.1111/j.1365-2567.2007.02677.x] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
In this study, we have evaluated the production of pro- and anti-inflammatory cytokines and the formation of central and effector memory T cells in mice lacking mature B cells (mu MT KO). The results show that Trypanosoma cruzi infection in C57Bl/6m mu MT KO mice is intensified in relation to control mice and this exacerbation is related to low levels of inflammatory cytokines produced during the acute infection and the lower numbers of central and effector memory CD4(+) and CD8(+) T cells generated during the acute phase of the infection. In addition, a marked reduction in the CD8(+) T-cell subpopulation was observed in mu MT KO infected mice. In agreement to this, the degree of tissue parasitism was increased in mu MT mice and the tissue inflammatory response was much less intense in the acute phase of the infection, consistent with a deficit in the generation of effector T cells. Flow cytometry analysis of the skeletal muscle inflammatory infiltrate showed a predominance of CD8(+) CD45Rb low in B-cell-sufficient C57Bl/6 mice, whereas the preponderant cell type in mu MT KO skeletal muscle inflammatory infiltrate was CD4(+) T cells. In addition, CD8(+) T cells found in skeletal muscle from mu MT KO infected mice were less activated than in control B-cell sufficient infected mice. These results suggest that B cells may participate in the generation of effector/memory T cells. In addition and more importantly, B cells were crucial in the maintenance of central and effector memory CD8(+) T cell, as well as the determination of the T cell cytokine functional pattern, and they may therefore account for critical aspects of the resistance to intracellular pathogens, such as T. cruzi.
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Affiliation(s)
- Fabiola Cardillo
- Cellular Immunology, Autoimmunity and Experimental Chagas Disease Laboratory, Oswaldo Cruz Foundation, Gonçalo Moniz Research CenterSalvador, Bahia, Brazil
| | - Edilberto Postol
- Immunology Laboratory, Heart Institute (INCOR), University of São PauloSão Paulo, SP, Brazil
| | - Jorge Nihei
- Cellular Immunology, Autoimmunity and Experimental Chagas Disease Laboratory, Oswaldo Cruz Foundation, Gonçalo Moniz Research CenterSalvador, Bahia, Brazil
| | | | - Auro Nomizo
- Department of Clinical Analysis, Toxicology and Bromatology, Faculty of Pharmaceutical Sciences of Ribeirão Preto, University of São PauloBrazil
| | - José Mengel
- Cellular Immunology, Autoimmunity and Experimental Chagas Disease Laboratory, Oswaldo Cruz Foundation, Gonçalo Moniz Research CenterSalvador, Bahia, Brazil
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15
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João C. Immunoglobulin is a highly diverse self-molecule that improves cellular diversity and function during immune reconstitution. Med Hypotheses 2007; 68:158-61. [PMID: 16890385 DOI: 10.1016/j.mehy.2006.05.062] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2006] [Revised: 05/19/2006] [Accepted: 05/23/2006] [Indexed: 10/24/2022]
Abstract
Paradoxically, human B cell immune deficiencies are associated with increased susceptibility to viral and fungi infections, which are T cell immunity related infections. Also, some viral infections occurring in immune depressed patients such as cytomegalovirus infections are recommended to be treated with intravenous immunoglobulin (IVIg) in combination with antiviral therapy. This fact has no clear biological explanation but it has been shown to be successful. Recently, B cells and immunoglobulin were identified as essential elements driving T cell receptor (TCR) diversity generation. Idiotype peptides of B cell immunoglobulin may be the driving force for the antigen presenting function of B cells and other antigen presenting cells to influence the T cell repertoire. This seems to be another relevance of Jerne's idiotypic network and another function of immunoglobulin. Since T cells function depends on the diversity of the TCR repertoire, means to increase the diversity of the T cell repertoire may improve T cell function in situations characterized by a contracted TCR repertoire, such as AIDS, primary immunodeficiency, cancer, autoimmunity and following chemotherapy and hematopoietic precursors transplantation. The clinical hypothesis here put forward is that B cells and/or immunoglobulin may be used therapeutically aiming to increase and potentially to restore T cell repertoire diversity improving T cell function in situations implicating a contracted T cell repertoire. The fact that immunoglobulin influence the composition of T cell repertoire by increasing its diversity allows a much wider application of this molecule in the clinical practice. Here is presented a novel reasoning for the use of IVIg in humans, which should be explored. All the situations where immune reconstitution occurs are potentially a target for this therapeutically mechanism, aiming to fast and improve the diversity of the reconstituted immune repertoires. This new role of Ig molecule, an old and widely therapeutically used molecule, may help to explain several effects that IVIg have in the T cell compartment, such as modulation of the activation and function of effectors T cells. The idea that immunoglobulin is essential in the generation and maintenance of a diverse compartment of T cells, affecting T cell function via that mechanism suggests a promising approach to medical conditions involving immune reconstitution. Furthermore, it represents a new paradigm of understanding the immune system as a complex, interdependent web of cells/cell products that inter-affect each other generation, function and survival.
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Affiliation(s)
- Cristina João
- Internal Medicine Department-Hematology Division, Mayo Clinic, Stabile building, 6th floor, 200th Street SW, Rochester, MN, USA.
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