Subhajit Dasgupta et al., J Immunol Tech Infect Dis 2015, 4:1 http://dx.doi.org/10.4172/2329-9541.1000131 Review Article Journal of Immunological Techniques in Infectious Diseases A SCITECHNOL JOURNAL Prospect of CD52 Targeted Alemtuzumab in Treatment of CNS Demyelination in Multiple Sclerosis Subhajit Dasgupta1* and Mausumi Bandyopadhyay2 1Department of Microbiology, Immunology and Department of Biochemistry, Saint James School of Medicine, Albert Lake drive, The Quarter, A-I-2640, P.O Box 318, Anguilla BWI, Anguilla 2Biological Sciences, Trident Technical College, North Charleston, South Carolina 29406, USA *Correspondence author: Subhajit Dasgupta, Department of Microbiology, Immunology, Saint James School of Medicine, Albert Lake Drive, The Quarter, P.O Box 318, A-I-2640, Anguilla BWI, Anguilla; Tel: +1-264-497-5125 E-mail: [email protected] Rec date: 19 Nov, 2014 Acc date: 15 Jan, 2015 Pub date: 19 Jan, 2015 Abstract The choice of humanized monoclonal antibody is a novel therapeutic approach for autoimmune relapsing remitting multiple sclerosis (RRMS). In addition to anti-alpha-4 integr in monoclonal antibody Natalizumab, introduction of CAMPATH-1 (Alemtuzumab) is a fairly new approach in MS research and clinical trials. The uniqueness of this monoclonal antibodyis that it depletes CD52 marker expressing circulatory T and B cells including monocytes and dendritic cells. However, it has no impact on progenitor cells. Thus, the use of Alemtuzumab has gained importance in delaying rejection in allograft during transplantation. Very recently, Alemtuzumab has been approved for treatment of severe cases of RRMS. While therapeutic monoclonal antibody to prevent inflammatory cytokine mode of action is still under investigation in EAE model, Alemtuzumab, in addition to existing drug Natalizumab, was found to have importance in the treatment of RRMS. In the context of clinical findings, we analyze the prospect of Alemtuzumab in long term therapy of multiple sclerosis. Keywords: Multiple sclerosis; CD52; Lymphocytes; Monoclonal antibody; Alemtuzumab Introduction Multiple sclerosis (MS) is a T cell-mediated autoimmune disease of the central nervous system [1-3]. Progression of this disease causes chronic inflammation and initiates demyelination and axonal degeneration in white matter. The damage, or death of myelin synthesizing oligodendrocytes, is known to initiate demyelinating foci in MS, predominantly in females [4,5]. In order to prevent progression of disease, the major aims in MS drug discovery are first, to decrease generation of myelin antigen specific T helper cells and thereby to induce antigen specific immunosuppression; secondly, to prevent the entry of these T cells into the central nervous system; and, lastly, to initiate regeneration of oligodendrocytes, axon, and re-myelination of white matter in central nervous system. Recent advancement of MS research suggested several standpoints to attenuate mode of action of myelin antigen responsive T- bet positive T cells in experimental autoimmune encephalomyelitis (EAE), murine model for multiple sclerosis[6-8].Researches in different laboratories also suggested role of T helper 17 in autoimmune response of MS and its animal model EAE [9-11]. The outcome of these findings demonstrated a pivotal role of myelin-antigen responsive T helper 1, T helper 17 cells causing inflammation and demyelination during progression of disease. Thus, the strategies for MS drug discovery are developed to control these myelin antigen specific circulatory T cells, either attenuating their function or depleting them from peripheral circulation. The existing drugs for MS like betaseron (rebif), copaxonewere successful in clinical trials [12]. The laboratory based experimental findings on inhibitors of Hydroxymethyl glutaryl CoA reductase (HMG CoA reductase) [13,14], inhibitors of NF-kappaB activation [15,16], inhibitors of poly-ADP-ribose-polymerase 2 (PARP) [17,18] are mostly focused on attenuation of T helper cells in EAE. These inhibitors are currently awaiting clinical trials. The successful monoclonal antibody therapy of MS has been introduced with discovery of Natalizumab, a FDA approved drug for MS [19,20]. The recent experimental findings in EAE also suggested efficacy of laboratory raised monoclonal antibody for IL12p40/p40 homodimer in attenuation of clinical symptoms of EAE [21-23]. In addition, several investigations also indicated evidence of B cell activation and production of anti-myelin auto antibodies in MS and EAE [24-26]. Thus, keeping all the information under consideration, the generation of new monoclonal antibodies and clinical trials are accountable for MS therapy [27,28]. The existing therapeutic monoclonal antibodies for EAE and multiple sclerosis (MS) The existing therapy for MS includes three distinct classes of medicine: I. Immunomodulators; II. Immunosuppresive medicines III. Monoclonal antibodies [29,30].The screening of proper immunomodulators is an important target of MS drug discovery. The immunosuppressive agents, commonly used corticosteroids, are still in use for temporary relief from autoimmune inflammatory responses and allergic manifestations. However, alternatives of these drugs are necessary to minimize inadvertent side effects. The humanized monoclonal antibodies are comparatively new generation anti-MS drugs with certain level of success. The anti-alpha4 integin monoclonal antibody Natalizumab is approved by Food and Drug Administration (FDA) to treat MS patients. After that, several other humanized monoclonal antibodies have been under clinical trials and received various range of success. The table 1 summarizes different monoclonal antibodies which are currently under clinical trial and included in the list of MS therapy (Table 1). All articles published in Journal of Immunological Techniques in Infectious Diseases are the property of SciTechnol, and is protected by copyright laws. Copyright © 2014, SciTechnol, All Rights Reserved. Citation: Subhajit D, Mausumi B (2015) Prospect of CD52 Targeted Alemtuzumab in Treatment of CNS Demyelination in Multiple Sclerosis. J Immunol Tech Infect Dis 4:1. doi:http://dx.doi.org/10.4172/2329-9541.1000131 Name of therapeutic monoclonal antibody Specific Target Clinical trials / under investigation in laboratory References Natalizumab (Tysabri) α-4 integrin Clinical trials (FDA approved for MS drug) McCormack 2013; Drugs 73 (13), 1463-1481; Clerico et al. 2014; JAMA Neurol. 71 (8), 954-960; Mindur et al. 2014; PLoS One 9 (6 ), e99068 doi: 10.1371/journal. Pone 0099068; Cree 2014; Neurohospitalist 4 (2), 63-65 Rituximab (Zytux) CD20 Clinical trials Gasperini et al. 2013; Expert Opin Investig Drugs 22 (10), 1243-1253; Fernandez et al. 2012; Rev Neurol. 54 (12), 734- 749 Daclizumab (Zenapax) CD25 Clinical trial/ investigation Ocrelizumab CD20 Clinical trial Gasperini et al. 2013; Expert Opin Investig Drugs 22 (10), 1243-1253; Fernandez et al. 2012; Rev Neurol. 54 (12), 734- 749 Ofatumumab (Arzerra) CD20 Clinical trial Cross and Naismith 2014; J Intern Med 275 (4), 350-63 doi: 10.1111/joim.12203; Fernandez et al. 2012; Rev Neurol. 54 (12), 734- 749 Ustekinumab 1275) IL12/IL23 inhibitor) (CNTO (IL-17A Under Clinical trial/ investigation under Bielekova 2013; Neurotherapeutics 10 (1 ), 55-67; Zhang et al. 2014 Mult Scler. ; 20 (2), 156-164 Benson et al. 2011; Nature Biotechnology 29 615-624 doi: 10.1038/nbt.1903; www.fda.gov/ohrms/dockets/ac/08/.../2008-4361b1-02-CENTOCOR. Tabalumab (Ly-2127399) Bcell activating factor (BAFF) Under investigation Gensicke et al. 2012 CNS Drugs 26 (1 ), 11-37 Secukinumab (AIN 457) IL-17A inhibitor Clinical trial/ investigation under Rudick et al. 2013; European Committee for treatment and research in multiple sclerosis (2-5th October, Copenhagen, Denmark Alemtuzumab (CAMPATH 1H) CD52 Clinical trial/ investigation under Coles AJ 2013; Neurotherapeutics 10 (1 ), 29-33 Monoclonal antibody IL12p40/402 homodimer Under investigation Dasgupta et al. 2008; Hybridoma 27 (3), 141-151; Mondal S et al. 2009; J Immunol. 182 (8), 5013-5033 Monoclonal antibody for MHC II MHCII Under (EAE) Smith et al. 1994; Immunology 83, 1-8 Monoclonal antibody for CD4 CD4 (T helper cell) Clinical trial/ investigation investigation Under Van Oosten et al. 1997; Neurology 49 (2), 351-357; Llewellyn-Smith et al. 1997; Neurology 48 (4), 810-816 Table 1: Therapeutic monoclonal antibodies for multiple sclerosis The anti-CD20 monoclonal antibody Rituximab and anti-CD52 monoclonal antibody Alemtuzumab have ability to deplete T and B cells, thus causing attenuation of circulatory pool of reactive lymphocytes. The European Medicine Agency (EMA) approved Alemtuzumab as MS drug (trade name Lemtrada).Very recently; the drug has received approval from Food and Drug Administration (FDA, USA) for treatment of RRMS. Alemtuzumab has prospect to treat demyelination in relapsing-remitting multiple sclerosis (RRMS) In recent clinical trials, Coles et al. [31-33] and several other investigators [34-36] demonstrated the prospect of Alemtuzumab in reducing relapsing remitting multiple sclerosis (RRMS) and attenuating rate of sustained disability. Jones and Coles [37] described that the drug showed efficacy to reduce relapse by 70% as compared to betaseron. Cohen et al. [38] demonstrated the safety profile and benefit of Alemtuzumab treatment in RRMS while also comparing its efficacy with interferon beta 1A. The observations in the 2 year ratermarked randomized controlled phase 3 trial among adults (age 18-50 years) without any report of RRMS suggested that, the treatment has ability to reduce severity of RRMS. Despite this, there are incidences of herpes virus infection in the patients treated with Alemtuzumab. A group of patients also reported to develop thrombocytopenia, which Volume 4 • Issue 1 • 1000131 was not found in interferon beta treated patient group. In addition, a patient was found to develop thyroid papillary carcinoma after Alemtuzumab treatment. Thus, the prospect of Alemtuzumab requires modification of treatment schedule to minimize unwanted microbial infections during progression of RRMS. In a recent review article, Cross and Naismith depicted the benefit to risk ratio in MS treatment strategies which included mechanism of action and safety profiles of different drugs [39]. Weindl and Kieseier [40] recently highlighted the immunotherapeutic role of T and B cell depleting monoclonal antibody Alemtuzumab in RRMS. In a pilot case-control study on twenty-four patients, McCarthy et al. [41] showed that depletion of lymphocytes by Alemtuzumab has minimal effect on memory B cells for production of secondary antibody. Also, efficacy of Alemtuzumab treatment has no adverse effect on vaccination against microbial antigens like tetanus, diphtheria, polio, meningococcus C, Tindependent pneumococcal antigen, and common vaccination for measles as well as mumps. The observations of the pilot study indicated presence of a quick balance mechanism in immunocompetent hosts following CD52 marker positive lymphocyte depletion during Alemtuzumab treatment. The findings lead a new direction in MS translational research to address the cell signal • Page 2 of 5 • Citation: Subhajit D, Mausumi B (2015) Prospect of CD52 Targeted Alemtuzumab in Treatment of CNS Demyelination in Multiple Sclerosis. J Immunol Tech Infect Dis 4:1. doi:http://dx.doi.org/10.4172/2329-9541.1000131 mechanisms which generate a new pool of lymphocytes thus lack of self – myelin antigen responsiveness. transplantation is a new direction of future translational study of autoimmune diseases. In this aspect, the monoclonal antibody Alemtuzumab gains a prospect in treatment of demyelination in relapsing remitting multiple sclerosis. However, many investigators reported side effects in patient’s during long term Alemtuzumab treatment [42-44]. Recently, Daniels et al. [45], Tsourdi et al. [46] reported emergence of thyroid disorder and onset of Graves’ disease after Alemtuzumab treatment. The reports on adverse effects thus restrict its use in RRMS treatment and indicate a requirement for a strategic development of new generation of CD52 monoclonal antibody with minimum side effects. Conclusion The depletion of lymphocytes due to Alemtuzumab treatment causes transient lymphopenia [47,48]. However, generation of functional B and T cells from lymphoid progenitor cells have an option to replenish lymphocytes in MS patients. The property of B cells to present antigen is another important aspect in the context of Alemtuzumab therapy. Considering the fact that, infiltration of peripheral immune cells, predominantly T cells and B cells, monocyte/ macrophages, neutrophils, and dendritic cells into CNS through blood brain barrier initiate CNS inflammation. In subsequent phases, microglial activation takes place in CNS. There is possibility that B cells express Major Histocompatibility Complex class II (MHC II) and act as antigen presenting cells (APC) to present myelin antigens to T cells within CNS. Thus, repriming of antigen specific T cells inside CNS generates long lasting and sustained inflammatory responses, causing demyelination. In support of this hypothesis, a few related investigations are found demonstrating the abilities of B cells to function as APC [49,50]. Acknowledgement The recent evidence of clinical trials, since the discovery of the humanized monoclonal antibody Alemtuzumab, suggest an immunotherapeutic prospect of Alemtuzumab in treatment of RRMS patients within a restricted domain of dose-time in treatment to minimize the side effects. Prospect of Alemtuzumab in transplant therapy of MS The only advantage of using Alemtuzumab is its ability to deplete lymphocytes and delaya chance of rejection due to Graft versus Host disease (GVHD) in transplantation. In this aspect, the mode of action of CD52 monoclonal antibody is different than other existing drugs for MS. The prospect of Alemtuzumab is reported in treatment of terminal kidney failure [51-53]. In recent years, bone marrow transplantation has been found as a new approach for treatment of autoimmune disease [54,55]. The procedure, though still under experimental stage, undoubtedly, provides with future promise for therapy of relapsing remitting multiple sclerosis [55,56]. The recent developments indicate autologous bone marrow transplantation as well as umbilical cord-derived mesenchymal stem cells transplantation as new directions of MS therapy [57-60]. It can be postulated that instead of direct treatment for long period, autologous or HLA matched heterologous bone marrow transplantation in presence of low dose of CD52 depleting Alemtuzumab is a better way to minimize drug-induced side effects. The in vitro treatment of bone marrow with Alemtuzumab prior to transplantation will deplete mature CD52 positive lymphocytes, mostly T helper cells in immuno competent MS patients. At the same time, presence of Alemtuzumab in circulation will decrease CD52 positive T and B cells in MS patients thereby, reducing the chances of self myelin antigen primed T cell activation in RRMS. Consequently, the improvement of treatment strategy from prolong therapy to immunotherapy in conjunction with bone marrow Volume 4 • Issue 1 • 1000131 The therapeutic efficacy of Alemtuzumab in relapsing remitting multiple sclerosis is shown in clinical trials. However, its mode of action has limitations in long-term treatment. The prospect of Alemtuzumab has been found in kidney transplantation where the monoclonal antibody delays graft versus host disease-mediated tissue rejection. 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