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Pang V, Seery N, Wesselingh R, Yeh W, Zhong M, Tan T, Dwyer C, Nesbitt C, Rath L, Perera D, Bridge F, Skibina O, Bosco JJ, Jokubaitis V, Marriott M, Butkueven H, Van Der Walt A, Massey J, Sutton I, Monif M. Neutropaenia complications from Ocrelizumab and Rituximab treatment. Mult Scler Relat Disord 2024; 81:105147. [PMID: 38043368 DOI: 10.1016/j.msard.2023.105147] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 11/11/2023] [Accepted: 11/19/2023] [Indexed: 12/05/2023]
Abstract
Ocrelizumab is an anti-CD20 monoclonal antibody (mAb) that has been shown in phase 3 clinical trials to reduce relapses and disease progression in multiple sclerosis (MS) patients. Prior to the approval of ocrelizumab, rituximab, a chimeric anti-CD20 mAb was used to treat MS. Rituximab is still used to treat MS in many countries outside of Australia and remains mainstay of treatment of many non-MS neuroimmunological and systemic inflammatory diseases. Rituximab is currently used in neuromyelitis optica spectrum disorder (NMOSD) and autoimmune encephalitis, in addition to its widespread usage in hematological malignancies and systemic inflammatory diseases. Ocrelizumab is currently approved in Australia for treatment of relapsing-remitting MS (RRMS). Neutropaenia is a rare complication of both ocrelizumab and rituximab treatment. This case series reports 12 patients who have experienced neutropaenia following ocrelizumab or rituximab treatment and aims to characterize the clinical parameters of neutropaenia experienced by these patients, including the severity and duration of neutropaenia, length of hospital admission, the types of subsequent infections experienced and types of treatment necessary before patients reached count recovery. The unpredictability of neutropaenia and potential for serious infections highlight the need for continued hematological monitoring for patients on B-cell depleting therapies and calls for careful patient counselling to provide guidance on whether to continue such therapies in patients who have experienced related neutropaenia.
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Affiliation(s)
- Venus Pang
- Department of Neuroscience Monash University, Melbourne, Australia
| | - Nabil Seery
- Department of Neuroscience Monash University, Melbourne, Australia; Department of Neurology, Alfred Hospital, Melbourne, Australia
| | - Robb Wesselingh
- Department of Neuroscience Monash University, Melbourne, Australia; Department of Neurology, Alfred Hospital, Melbourne, Australia
| | - Wei Yeh
- Department of Neuroscience Monash University, Melbourne, Australia; Department of Neurology, Alfred Hospital, Melbourne, Australia
| | - Michael Zhong
- Department of Neuroscience Monash University, Melbourne, Australia; Department of Neurology, Alfred Hospital, Melbourne, Australia
| | - Tracie Tan
- Department of Neuroscience Monash University, Melbourne, Australia; Department of Neurology, Alfred Hospital, Melbourne, Australia
| | - Chris Dwyer
- Department of Neurology, Royal Melbourne Hospital, Melbourne, Australia
| | - Cassie Nesbitt
- Department of Neuroscience Monash University, Melbourne, Australia; Department of Neurology, Alfred Hospital, Melbourne, Australia
| | - Louise Rath
- Department of Neurology, Alfred Hospital, Melbourne, Australia
| | - Deborah Perera
- Department of Neurology, Alfred Hospital, Melbourne, Australia
| | - Francesca Bridge
- Department of Neuroscience Monash University, Melbourne, Australia; Department of Neurology, Alfred Hospital, Melbourne, Australia
| | - Olga Skibina
- Department of Neurology, Alfred Hospital, Melbourne, Australia
| | - Julian J Bosco
- Department of Allergy, asthma, Immunology, Alfred Hospital, Melbourne, Australia
| | - Vilija Jokubaitis
- Department of Neuroscience Monash University, Melbourne, Australia; Department of Neurology, Alfred Hospital, Melbourne, Australia
| | - Mark Marriott
- Department of Neurology, Royal Melbourne Hospital, Melbourne, Australia
| | - Helmut Butkueven
- Department of Neuroscience Monash University, Melbourne, Australia; Department of Neurology, Alfred Hospital, Melbourne, Australia
| | - Anneke Van Der Walt
- Department of Neuroscience Monash University, Melbourne, Australia; Department of Neurology, Alfred Hospital, Melbourne, Australia
| | - Jennifer Massey
- Department of Neurology, St Vincent's Hospital, Sydney, Australia
| | - Ian Sutton
- Department of Neurology, St Vincent's Hospital, Sydney, Australia
| | - Mastura Monif
- Department of Neuroscience Monash University, Melbourne, Australia; Department of Neurology, Alfred Hospital, Melbourne, Australia; Department of Neurology, Royal Melbourne Hospital, Melbourne, Australia.
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Pukoli D, Vécsei L. Smouldering Lesion in MS: Microglia, Lymphocytes and Pathobiochemical Mechanisms. Int J Mol Sci 2023; 24:12631. [PMID: 37628811 PMCID: PMC10454160 DOI: 10.3390/ijms241612631] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Revised: 08/05/2023] [Accepted: 08/07/2023] [Indexed: 08/27/2023] Open
Abstract
Multiple sclerosis (MS) is an immune-mediated, chronic inflammatory, demyelinating, and neurodegenerative disease of the central nervous system (CNS). Immune cell infiltration can lead to permanent activation of macrophages and microglia in the parenchyma, resulting in demyelination and neurodegeneration. Thus, neurodegeneration that begins with acute lymphocytic inflammation may progress to chronic inflammation. This chronic inflammation is thought to underlie the development of so-called smouldering lesions. These lesions evolve from acute inflammatory lesions and are associated with continuous low-grade demyelination and neurodegeneration over many years. Their presence is associated with poor disease prognosis and promotes the transition to progressive MS, which may later manifest clinically as progressive MS when neurodegeneration exceeds the upper limit of functional compensation. In smouldering lesions, in the presence of only moderate inflammatory activity, a toxic environment is clearly identifiable and contributes to the progressive degeneration of neurons, axons, and oligodendrocytes and, thus, to clinical disease progression. In addition to the cells of the immune system, the development of oxidative stress in MS lesions, mitochondrial damage, and hypoxia caused by the resulting energy deficit and iron accumulation are thought to play a role in this process. In addition to classical immune mediators, this chronic toxic environment contains high concentrations of oxidants and iron ions, as well as the excitatory neurotransmitter glutamate. In this review, we will discuss how these pathobiochemical markers and mechanisms, alone or in combination, lead to neuronal, axonal, and glial cell death and ultimately to the process of neuroinflammation and neurodegeneration, and then discuss the concepts and conclusions that emerge from these findings. Understanding the role of these pathobiochemical markers would be important to gain a better insight into the relationship between the clinical classification and the pathomechanism of MS.
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Affiliation(s)
- Dániel Pukoli
- Department of Neurology, Esztergomi Vaszary Kolos Hospital, 2500 Esztergom, Hungary;
| | - László Vécsei
- Department of Neurology, Faculty of Medicine, University of Szeged, Semmelweis u. 6., H-6725 Szeged, Hungary
- Danube Neuroscience Research Laboratory, ELKH-SZTE Neuroscience Research Group, Eötvös Loránd Research Network, University of Szeged (ELKH-SZTE), Tisza Lajos krt. 113, H-6725 Szeged, Hungary
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Gynthersen RMM, Hansen MF, Ocias LF, Kjaer A, Petersen RF, Ostrowski SR, Harritshøj L, Jacobsen S, Overgaard U, Krogfelt KA, Lebech AM, Mens H. Neoehrlichia mikurensis in Danish immunocompromised patients: a retrospective cohort study. Ann Clin Microbiol Antimicrob 2023; 22:20. [PMID: 36941613 PMCID: PMC10026440 DOI: 10.1186/s12941-023-00571-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Accepted: 03/03/2023] [Indexed: 03/23/2023] Open
Abstract
BACKGROUND The tick-borne bacterium, Neoehrlichia mikurensis (N. mikurensis) can cause severe febrile illness and thromboembolic complications in immunocompromised individuals. We investigated the presence of N. mikurensis DNA in retrospectively collected plasma from a well-characterized cohort of Danish immunocompromised patients. METHODS Plasma samples from 239 patients with immune dysfunction related to hematological or rheumatological disease or due to immunosuppressive therapy, were retrieved from a transdisciplinary biobank (PERSIMUNE) at Rigshospitalet, Copenhagen, Denmark. Serving as immunocompetent controls, plasma samples from 192 blood donors were included. All samples were collected between 2015 and 2019. Real-time PCR targeting the groEL gene was used to detect N. mikurensis DNA. Sequencing was used for confirmation. Borrelia burgdorferi sensu lato IgG antibodies were detected by ELISA as a proxy of tick exposure. Prevalence was compared using Fisher's exact test. RESULTS Neoehrlichia mikurensis DNA was detected in 3/239 (1.3%, 95% confidence interval (CI): 0.3 - 3.6%) patients, all of whom primarily had a hematological disease. Follow-up samples of these patients were negative. N. mikurensis DNA was not detected in any of the blood donor samples. IgG antibodies against B. burgdorferi s.l. were detected with similar prevalence in immunocompromised patients and blood donors, i.e., 18/239 (7.5%, 95% CI: 4.8-11.5%) and 11/192 (5.7%, 95%: CI 3.2-10.0%). CONCLUSION In this study, patients with N. mikurensis were not identified by clinical indication and N. mikurensis may therefore be underdiagnosed in Danish patients. Further investigations are needed to explore the clinical significance and implications of this infection.
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Affiliation(s)
- Rosa Maja Møhring Gynthersen
- Department of Infectious Diseases, Copenhagen University Hospital, Rigshospitalet, Blegdamsvej 9, 2100, Copenhagen, Denmark.
| | - Mette Frimodt Hansen
- Department of Science and Environment, Roskilde University, Universitetsvej 1, 4000, Roskilde, Denmark.
| | - Lukas Frans Ocias
- Department of Clinical Microbiology, Karlstad Hospital, Region Värmland, Karlstad, Sweden
| | - Andreas Kjaer
- Department of Clinical Physiology and Nuclear Medicine & Cluster for Molecular Imaging, Copenhagen University Hospital - Rigshospitalet & Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Randi Føns Petersen
- Department of Bacteria, Fungi and Parasites, Statens Serum Institut, Copenhagen, Denmark
| | - Sisse Rye Ostrowski
- Department of Clinical Immunology, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Lene Harritshøj
- Department of Clinical Immunology, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Søren Jacobsen
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
- Copenhagen Research Center for Autoimmune Connective Tissue Diseases - COPEACT, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
| | - Ulrik Overgaard
- Department of Hematology, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
| | - Karen Angeliki Krogfelt
- Department of Science and Environment, Roskilde University, Universitetsvej 1, 4000, Roskilde, Denmark
| | - Anne-Mette Lebech
- Department of Infectious Diseases, Copenhagen University Hospital, Rigshospitalet, Blegdamsvej 9, 2100, Copenhagen, Denmark
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Helene Mens
- Department of Infectious Diseases, Copenhagen University Hospital, Rigshospitalet, Blegdamsvej 9, 2100, Copenhagen, Denmark
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Liu Y, Tan Y, Zhang Z, Li H, Yi M, Zhang Z, Hui S, Peng W. Neuroimmune mechanisms underlying Alzheimer's disease: Insights into central and peripheral immune cell crosstalk. Ageing Res Rev 2023; 84:101831. [PMID: 36565960 DOI: 10.1016/j.arr.2022.101831] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Revised: 12/15/2022] [Accepted: 12/19/2022] [Indexed: 12/24/2022]
Abstract
Alzheimer's disease (AD) is a highly life-threatening neurodegenerative disease. Dysregulation of the immune system plays a critical role in promoting AD, which has attracted extensive attention recently. Central and peripheral immune responses are involved in the pathogenesis of AD. Immune changes precede Aβ-associated senile plaque formation and tau-related neurofibrillary tangles, which are the recognised pathological features of AD. Therefore, elucidating immune-related mechanisms underlying the development of AD can help to prevent and treat AD at the source by blocking its progression before the development of pathological changes. To understand the specific pathogenesis of AD, it is important to examine the role of central and peripheral immunity in AD. This review summarises immune-related mechanisms underlying the pathogenesis of AD, focusing on the effect of various central and peripheral immune cells, and describes the possible crosstalk between central and peripheral immunity during the development of AD. This review provides novel insights into the treatment of AD and offers a new direction for immune-related research on AD in the future.
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Affiliation(s)
- Yuqing Liu
- Department of Integrated Traditional Chinese & Western Medicine, The Second Xiangya Hospital, Central South University, Changsha 410011, China; National Clinical Research Center for Metabolic Diseases, Changsha 410011, China.
| | - Yejun Tan
- School of Mathematics, University of Minnesota Twin Cities, Minneapolis, MN, USA.
| | - Zheyu Zhang
- Department of Integrated Traditional Chinese & Western Medicine, The Second Xiangya Hospital, Central South University, Changsha 410011, China; National Clinical Research Center for Metabolic Diseases, Changsha 410011, China.
| | - Hongli Li
- Department of Integrated Traditional Chinese & Western Medicine, The Second Xiangya Hospital, Central South University, Changsha 410011, China; National Clinical Research Center for Metabolic Diseases, Changsha 410011, China.
| | - Min Yi
- Department of Integrated Traditional Chinese & Western Medicine, The Second Xiangya Hospital, Central South University, Changsha 410011, China; National Clinical Research Center for Metabolic Diseases, Changsha 410011, China.
| | - Zhen Zhang
- YangSheng College of Traditional Chinese Medicine, Guizhou University of Traditional Chinese Medicine, Guiyang 550025, Guizhou, China.
| | - Shan Hui
- Department of Geratology, Hunan Provincial People's Hospital, The First Affiliated Hospital of Hunan Normal University, Changsha 410005, China.
| | - Weijun Peng
- Department of Integrated Traditional Chinese & Western Medicine, The Second Xiangya Hospital, Central South University, Changsha 410011, China; National Clinical Research Center for Metabolic Diseases, Changsha 410011, China.
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Boyko AN, Alifirova VM, Lukashevich IG, Goncharova ZA, Greshnova IV, Zaslavsky LG, Kotov SV, Malkova NA, Mishin GN, Parshina EV, Poverennova IY, Prakhova LN, Sivertseva SA, Smagina IV, Totolyan NA, Trinitatsky YV, Trushnikova TN, Khabirov FA, Shchur SG, Artemyeva AV, Bolsun DD, Zinkina-Orikhan AV, Linkova YN. [Efficacy and safety of divozilimab during 24-week treatment of multiple sclerosis patients in randomized double-blind placebo-controlled clinical trial BCD-132-2]. Zh Nevrol Psikhiatr Im S S Korsakova 2023; 123:37-47. [PMID: 37084363 DOI: 10.17116/jnevro202312304137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/23/2023]
Abstract
OBJECTIVE To find the optimal therapeutic dose of the anti-B cell mAb divozilimab (DIV) based on the efficacy and safety data of intravenous administration at a dose of 125 mg or 500 mg in patients with relapsing remitting multiple sclerosis (RRMS) compared to placebo (PBO) and teriflunomide (TRF). To study the efficacy and safety of DIV within 24 weeks of treatment. MATERIAL AND METHODS A multicenter, randomized, double-blind and double-masked, placebo-controlled phase 2 clinical trial (CT) BCD-132-2 involved 271 adult patients with RRMS from 25 centres In Russia. Patients were randomly assigned (2:2:2:1) into 4 groups: TRF, DIV 125 mg, DIV 500 mg and PBO. After screening patients entered to the main period, which consisted of one cycle of therapy for 24 weeks. The primary endpoint was the total number of gadolinium-enhancing T1 lesions (Gd+) observed on brain MRI scans after 24 weeks (per scan - involves estimating the mean value of the score from all the MRI assessments performed for each participant in the study). RESULTS 263 patients completed 24 weeks of treatment. Most of the patients in the DIV groups had no lesions on T1-weighted MRI after 24 weeks of treatment (94.44% on 125 mg and 93.06% on 500 mg). In the TRF and PBO groups the values were significantly lower: 68.06% and 56.36% respectively (both p<0.05). The proportions of relapse-free patients in the DIV groups were 93.06% and 97.22% (125 mg and 500 mg, respectively). As expected, DIV reduced the CD19+ B-cells. However, the repopulation rate of CD19+ B-cells in the 125 mg group was more pronounced (mainly due to the recovering pool of CD27-naive B-cells) compared to the 500 mg group. DIV showed a favorable safety profile at both doses. CONCLUSION Thus, the assessment of 24 weeks treatment demonstrated that DIV is a highly effective, safe and convenient option for the treatment of RRMS patients, both naive and previously treated with disease modifying therapy. A dose of 500 mg is recommended for further efficacy and safety evaluation during phase 3 CT.
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Affiliation(s)
- A N Boyko
- Pirogov Russian National Research Medical University, Moscow, Russia
- Federal Center of Brain and Neurotechnologies, Moscow, Russia
| | | | - I G Lukashevich
- Orden of the Red Banner of Labor City Clinical Hospital No. 1, Chelyabinsk, Russia
| | | | - I V Greshnova
- Ulyanovsk Regional Clinical Hospital, Ulyanovsk, Russia
| | - L G Zaslavsky
- Leningrad Regional Clinical Hospital, St. Petersburg, Russia
| | - S V Kotov
- Vladimirsky Moscow Regional Research Clinical Institute, Moscow, Russia
| | - N A Malkova
- State Novosibirsk Regional Clinical Hospital, Novosibirsk, Russia
| | - G N Mishin
- Pyatigorsk City Clinical Hospital No. 2, Pyatigorsk, Russia
| | - E V Parshina
- Semashko Nizhny Novgorod Regional Clinical Hospital, Nizhny Novgorod, Russia
| | | | - L N Prakhova
- N. Bechtereva Institute of the Human Brain, St. Petersburg, Russia
| | | | | | - N A Totolyan
- Academician I.P. Pavlov First Saint Petersburg State Medical University, St. Petersburg, Russia
| | | | | | - F A Khabirov
- Republican Clinical Nerological Center, Kazan, Russia
| | - S G Shchur
- Municipal Filatov Clinical Hospital No. 15, Moscow, Russia
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Muñoz-San Martín M, Gómez I, Quiroga-Varela A, Gonzalez-del Río M, Robles Cedeño R, Álvarez G, Buxó M, Miguela A, Villar LM, Castillo-Villalba J, Casanova B, Quintana E, Ramió-Torrentà L. miRNA Signature in CSF From Patients With Primary Progressive Multiple Sclerosis. NEUROLOGY(R) NEUROIMMUNOLOGY & NEUROINFLAMMATION 2022; 10:10/1/e200069. [PMID: 36724195 PMCID: PMC9743264 DOI: 10.1212/nxi.0000000000200069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Accepted: 10/11/2022] [Indexed: 12/13/2022]
Abstract
BACKGROUND AND OBJECTIVES Primary progressive multiple sclerosis (PPMS) displays a highly variable disease progression with a characteristic accumulation of disability, what makes difficult its diagnosis and efficient treatment. The identification of microRNAs (miRNAs)-based signature for the early detection in biological fluids could reveal promising biomarkers to provide new insights into defining MS clinical subtypes and potential therapeutic strategies. The objective of this cross-sectional study was to describe PPMS miRNA profiles in CSF and serum samples compared with other neurologic disease individuals (OND) and relapsing-remitting MS (RRMS). METHODS First, a screening stage analyzing multiple miRNAs in few samples using OpenArray plates was performed. Second, individual quantitative polymerase chain reactions (qPCRs) were used to validate specific miRNAs in a greater number of samples. RESULTS A specific profile of dysregulated circulating miRNAs (let-7b-5p and miR-143-3p) was found downregulated in PPMS CSF samples compared with OND. In addition, in serum samples, miR-20a-5p and miR-320b were dysregulated in PPMS against RRMS and OND, miR-26a-5p and miR-485-3p were downregulated in PPMS vs RRMS, and miR-142-5p was upregulated in RRMS compared with OND. DISCUSSION We described a 2-miRNA signature in CSF of PPMS individuals and several dysregulated miRNAs in serum from patients with MS, which could be considered valuable candidates to be further studied to unravel their actual role in MS. CLASSIFICATION OF EVIDENCE This study provides Class II evidence that specific miRNA profiles accurately distinguish PPMS from RRMS and other neurologic disorders.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | - Ester Quintana
- From the Neuroinflammation and Neurodegeneration Group (M.M.-S.M., I.G., A.Q.-V., M.G.R., R.R.C., G.Á., A.M., E.Q., L.R.-T.), Girona Biomedical Research Institute (IDIBGI), Salt, Spain; CERCA Programme/Generalitat de Catalunya; Neurology Department (R.R.C., G.Á., L.R.-T.), Girona Neuroimmunology and Multiple Sclerosis Unit, Dr. Josep Trueta University Hospital and Santa Caterina Hospital; Red Española de Esclerosis Múltiple (REEM) (R.R.C., E.Q., L.R.-T.) Medical Sciences Department (R.R.C., E.Q., L.R.-T.), University of Girona (UdG), Spain; Girona Biomedical Research Institute (IDIBGI) (M.B.), Spain; Immunology Department (L.M.V.), Hospital Ramón y Cajal, Madrid, Spain; IRYCIS; and Unitat de Neuroimmunologia, Hospital Universitari i Politècnic La Fe.València (J.C.-V., B.C.).
| | - Lluís Ramió-Torrentà
- From the Neuroinflammation and Neurodegeneration Group (M.M.-S.M., I.G., A.Q.-V., M.G.R., R.R.C., G.Á., A.M., E.Q., L.R.-T.), Girona Biomedical Research Institute (IDIBGI), Salt, Spain; CERCA Programme/Generalitat de Catalunya; Neurology Department (R.R.C., G.Á., L.R.-T.), Girona Neuroimmunology and Multiple Sclerosis Unit, Dr. Josep Trueta University Hospital and Santa Caterina Hospital; Red Española de Esclerosis Múltiple (REEM) (R.R.C., E.Q., L.R.-T.) Medical Sciences Department (R.R.C., E.Q., L.R.-T.), University of Girona (UdG), Spain; Girona Biomedical Research Institute (IDIBGI) (M.B.), Spain; Immunology Department (L.M.V.), Hospital Ramón y Cajal, Madrid, Spain; IRYCIS; and Unitat de Neuroimmunologia, Hospital Universitari i Politècnic La Fe.València (J.C.-V., B.C.).
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TLR9/FCRL3 regulates B cell viability, apoptosis, and antibody and IL-10 production through ERK1/2, p38, and STAT3 signaling pathways. In Vitro Cell Dev Biol Anim 2022; 58:702-711. [PMID: 36121575 DOI: 10.1007/s11626-022-00720-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Accepted: 08/15/2022] [Indexed: 11/05/2022]
Abstract
B cells play a role in the progression of multiple sclerosis (MS) and are closely related to Fc-receptor like-3 (FCRL3), but little is known about FCRL3 in B cells and MS. Activation of TLR9 in B cells with CpG found that CpG promoted FCRL3 expression in a dose- and time-dependent manner. CpG significantly activated ERK1/2, p38, and STAT3 pathways, and FCRL3 overexpression further promoted the activation of these pathways, while FCRL3 siRNA significantly inhibited the activation of these pathways by CpG. CpG stimulation significantly promoted the viability of B cells, inhibited cell apoptosis, and enhanced the production of antibodies and secretion of IL-10 by B cells. FCRL3 siRNA blocked most of the above regulatory effects of CpG, but promoted the further production of antibodies by B cells. FCRL3 overexpression enhanced the pro-survival, anti-apoptotic, and IL-10-inducing effects of CpG, but inhibited the effect of CpG on promoting antibody production. After adding inhibitors of ERK1/2, p38, and STAT3 pathways, respectively, the effects of CpG on promoting cell viability, antibody production, and IL-10 secretion were significantly reduced, but the anti-apoptotic effect of CpG was only affected by the blockade of STAT3 pathway. In addition, FCRL3 regulated B cell antibody and IL-10 secretion mainly through its ITIMs. These results indicate that TLR9 activation affects B cell proliferation, apoptosis, antibody production, and IL-10 secretion by upregulating FCRL3 expression, and is associated with ERK1/2, p38, and STAT3 pathways. Therefore, FCRL3 may be an important target for the diagnosis and treatment of B cell-related diseases.
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