Knowing more about your diagnosis and understanding the pathophysiology of MS can be empowering. Wit... You look in the mirror, and something’s different. Sodium channels contribute to microglia/macrophage activation and function in EAE and MS. Glia 49, 220–229 (2005). Neurol. 27, 1812–1823 (2007). Meningeal inflammation plays a role in the pathology of primary progressive multiple sclerosis. Muraro, P. A. et al. CNS Drugs 32, 269–287 (2018). J. Immunol. Brain Res. Dextromethorphan protects dopaminergic neurons against inflammation-mediated degeneration through inhibition of microglial activation. Neurosignals 26, 77–93 (2018). & Svenningsson, A. Cerebrospinal fluid concentration of galectin-9 is increased in secondary progressive multiple sclerosis. Get the latest articles about multiple sclerosis sent to your inbox. 1,2 Environmental factors such as vitamin D levels, viral infections, obesity, and smoking can contribute to MS development. J. Neuroophthalmol. Enhanced number and activity of mitochondria in multiple sclerosis lesions. increased in recent decades, and costs of care for patients with MS have risen dramatically. Is It Stroke or MS Symptoms? has received travel support from Biogen Idec and Genzyme, speaker’s honoraria from Novartis, board honoraria from Celgene and grant support from Novartis, unrelated to this article. Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations. Nature 468, 244–252 (2010). USA 107, 11313–11318 (2010). Ann. J. Pathol. NMDA-receptor antagonists block B-cell function but foster IL-10 production in BCR/CD40-activated B cells. The course may be relapsing-remitting or progressive in nature. Cadavid, D. et al. This inflammation also stimulates the release of cytokines and other soluble factors that can interfere with the neurotransmission processes and potentially influence the loss of myelin.1 Few clinical trials and studies have shown that inflammation leads to relapses and potentiates neurological damage.14, Inflammation varies according to the stage of MS. Clinical improvement in a patient with neuromyelitis optica following therapy with the anti-IL-6 receptor monoclonal antibody tocilizumab. Multiple sclerosis (MS) is a disease of the central nervous system. Oxygen activating nonheme iron enzymes. CAS  Faissner, S. et al. Nave, K. A. Myelination and support of axonal integrity by glia. 338, 278–285 (1998). Opticospinal MS: blurred vision, vision changes, memory problems, and lesions on the optic nerve. has received speaker’s and advisory board honoraria from Biogen, EMD Serono, Roche, Novartis, Sanofi-Genzyme and Teva, and educational grants from Biogen, EMD Serono, Roche, Novartis, Sanofi-Genzyme and Teva. 4, e374 (2017). Early diagnosis and discussion of treatment options is important. It can also help you to improve your overall well-being. Copyright © 2023 Haymarket Media, Inc. All Rights Reserved 9, 802 (2018). The following are the nursing priorities for patients with multiple sclerosis: Recognize and assess signs and symptoms of multiple sclerosis (MS). Choi, J. W. et al. Moss, B. P., Rensel, M. R. & Hersh, C. M. Wellness and the role of comorbidities in multiple sclerosis. Smoking. Rothhammer, V. et al. & Li, J. Astrocyte galectin-9 potentiates microglial TNF secretion. Irvine, K. A. 187, 3431–3437 (2011). Long-term outcomes after autologous hematopoietic stem cell transplantation for multiple sclerosis. Dal-Bianco, A. et al. This study implicates ASIC1 as a potential therapeutic target for progressive MS. Vergo, S. et al. Howell, O. W. et al. N. Engl. Article  The motor, sensory, visual, and autonomic systems are compromised.1 Months or years may elapse between MS symptomatic episodes. Perspect. Monitor disease progression and assess relapses or flare-ups. It's an inflammatory condition . In the meantime, to ensure continued support, we are displaying the site without styles Eur. Unexpected additive effects of minocycline and hydroxychloroquine in models of multiple sclerosis: prospective combination treatment for progressive disease? 358, 131–137 (2015). The content of this site is published by the site owner(s) and is not a statement of advice, opinion, or information pertaining to The Ohio State University. Giuliani, F. et al. When we’re talking about progressive MS, so the later stages, however, there are also elements in the immune system that are probably slightly different compared to the initial stages. Sorbara, C. D. et al. TNF neutralization in MS: results of a randomized, placebo-controlled multicenter study. Multiple sclerosis deep grey matter: the relation between demyelination, neurodegeneration, inflammation and iron. Lodygin, D. et al. This unmet clinical need is related to the complexity of the pathophysiological mechanisms involved in MS progression. Moreover, neurodegeneration is accelerated by the altered expression of ion channels on denuded axons. 206, 1303–1316 (2009). USA 98, 13942–13947 (2001). & Xue, Q. S. Human CNS immune senescence and neurodegeneration. Zheng, Y. R., Zhang, X. N. & Chen, Z. Mitochondrial transport serves as a mitochondrial quality control strategy in axons: implications for central nervous system disorders. 124, 209–220 (2012). As part of last week's World MS Day, a documentary about the life of Mathew Embry, a multiple sclerosis (MS) patient who's been living symptom-free for more . 8 Doctors Who Treat MS: Which Specialist Handles Which Problem? It also causes the activation of IL-17 from T-helper 1, which is a more potent pro-inflammatory cytokine that is highly expressed, particularly during relapse of the disease (Garg & Smith, 2015). Mi, S. et al. Brain 112 (Pt 1), 133–146 (1989). Nature 541, 481–487 (2017). To correctly diagnose the disease there must be evidence of neuronal damage in at least two areas of the CNS, and this damage must have occurred at least one month apart (Garg & Smith, 2015). Exp. There is a number of established risk factors and many of you will have heard about the recent research that highlighted something that we knew for decades but is now reiterated and with strong evidence. & Wang, W. C. 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That doesn’t mean that there is no new lesion evolution, it’s just less obvious when we look say at MRI [magnetic resonance imaging] scans of disease over time. Progressive multiple sclerosis: from pathophysiology to therapeutic strategies. JAMA Neurol. More diffuse “shadow lesions” can occur throughout the CNS causing abnormal Wallerian degeneration, specifically in the white matter (Garg & Smith, 2015). In this review, the spectrum of MS lesions and their relation to the inflammatory process is described. Microglial control of astrocytes in response to microbial metabolites. 261, 67–76 (2013). Open Access Highly acidic foods like tomatoes and oranges. Rev. Rev. MRI imaging and spinal fluid analysis are used in the confirmation of disease (Garg & Smith, 2015). 05 May 2023, BMC Neurology In MS the body's immune system attacks myelin, which coats nerve cells. 25, 876–886 (2019). When it comes to multiple sclerosis (MS), having the right doctors on your side is essential. JAMA 321, 175–187 (2019). Res. Mitochondrial changes within axons in multiple sclerosis. Trials 50, 166–177 (2016). Gray matter is composed of the neuron cell bodies, whereas white matter is composed of the axons with their myelin sheaths. Immunol. The relation between inflammation and neurodegeneration in multiple sclerosis brains. This also includes the cranial nerves and associated optic nerves. Pathophysiology can also refer to the hallmarks of a disease that lead to these functional changes. This puts immune cells in a place that they should not be, thus creating the risk for an autoimmune reaction. Kalkers, N. F., Barkhof, F., Bergers, E., van Schijndel, R. & Polman, C. H. The effect of the neuroprotective agent riluzole on MRI parameters in primary progressive multiple sclerosis: a pilot study. A key neuropathology study, showing the association between cortical demyelination and white matter injury. Evidence for a two-stage disability progression in multiple sclerosis. The first clinical episode of neurological symptoms lasting at least 24 h, with features that are indicative of multiple sclerosis. Acta Neuropathol. Sorensen, P. S. et al. Schulz, K., Kroner, A. Flu-like symptoms such as chills, body aches, and fever. Ann Neurol. Wang, S. J., Wang, K. Y. tailored to your instructions. Within MS subtypes, there are differences among CNS areas in the proportion of lesions. The spinal cord, of course, leading to lower limb dysfunction, bladder dysfunction, sexual dysfunction, etc. Factors such as low vitamin D levels and a history of Epstein-Barr virus, smoking, and obesity, especially during childhood, also influence MS risk . J. Neurosci. Share your experience in the comments below, or start a conversation by posting on your Activities page. It may also open the door to useful conversations with doctors and other people living with the disease. J. Neurosci. Lancet Neurol 14, 183–193 (2015). 33, 719–723 (2014). Haider, L. et al. All authors contributed equally to the preparation of this manuscript. 133, 25–42 (2017). 15, 259–269 (2016). Sign up for the Nature Briefing newsletter — what matters in science, free to your inbox daily. CAS  An inflammatory animal model of multiple sclerosis, mediated by inoculation of myelin components with adjuvants. The relapse-remitting can turn into secondary progressive, which starts as relapse-remitting, but eventually turns into a progressive course (McCance & Huether, 2014). Deletion of mitochondrial anchoring protects dysmyelinating shiverer: implications for progressive MS. J. Neurosci. J. Med. Disord. Herder, V. et al. Nat. A person's blood type may be linked to their risk of having an early stroke, according to a new meta-analysis led by University of Maryland School of Medicine (UMSOM) researchers. have filed provisional patent applications at the US Food and Drug Administration (US patent application no. 23 (Suppl. IL17/IL17RA as a novel signaling axis driving mesenchymal stem cell therapeutic function in experimental autoimmune encephalomyelitis. PLOS ONE 9, e113954 (2014). Torkildsen, O., Myhr, K. M. & Bo, L. Disease-modifying treatments for multiple sclerosis – a review of approved medications. This study investigated mitochondrial defects in MS. Witte, M. E. et al. Neurosci. This demyelination and axonal loss leads to the development of MS lesions or plaques mainly in the white matter, but this can also occur in the gray matter. These antibodies oversee the destruction of the antigens. Multiple sclerosis. de los Monteros, A. E. et al. & David, S. Iron efflux from astrocytes plays a role in remyelination. Fumaric acid esters exert neuroprotective effects in neuroinflammation via activation of the Nrf2 antioxidant pathway. Bell’s Palsy and MS: What’s the Connection? Fox, R. J. et al. (EAE). N-methyl-D-aspartate receptor blockade is neuroprotective in experimental autoimmune optic neuritis. Multiple sclerosis (MS) is a condition that severely impairs a person's ability to function. Multiple sclerosis. It may include double vision, blurry vision, or loss of vision in one eye. Brain 134, 571–584 (2011). Fibronectin aggregation in multiple sclerosis lesions impairs remyelination. 292, 40–44 (2016). Craner, M. J. et al. 17, 495–499 (2011). UM School of Medicine Researchers Find Blood Type Linked to Risk of Stroke Before Age 60. Minocycline added to subcutaneous interferon beta-1a in multiple sclerosis: randomized RECYCLINE study. Dysferlin is a new marker for leaky brain blood vessels in multiple sclerosis. 6, 358–370 (2006). by Ed Tobias June 2, 2023. Immun. 29, 93–96 (2014). Cerebellar involvement with ataxia of limbs, [INAUIBLE] walking. That color comes from the myelin in those areas. Kutzelnigg, A. et al. For example, one pathophysiological hallmark of multiple sclerosis (MS) includes demyelination — damage to the protective covering of nerve cells. 66, 460–471 (2009). T1 lesions showing contrast agent (gadolinium) enhancement on magnetic resonance imaging. Each axon is covered with a myelin sheath. Reviewed by Michael Sapko, MD, on 7/1/2021. 62/412,555, entitled ‘Combination Therapy with Minocycline and Hydroxychloroquine for the Treatment of Multiple Sclerosis (MS)’ and US patent application no. Primary progressive course is less common. J Neuropathol Exp Neurol. Often, these lesions will show signs of inflammation and neurodegeneration. Iron and neurodegeneration in the multiple sclerosis brain. Nat. is grateful for grant support from the Medical Faculty of Ruhr-University Bochum (FoRUM). Gilgun-Sherki, Y., Panet, H., Melamed, E. & Offen, D. Riluzole suppresses experimental autoimmune encephalomyelitis: implications for the treatment of multiple sclerosis. J Exp Med. Low dose dextromethorphan attenuates moderate experimental autoimmune encephalomyelitis by inhibiting NOX2 and reducing peripheral immune cells infiltration in the spinal cord. From there, antigen-presenting cells can activate T cells against self-antigens. Adv. PubMed Central  Scler. Med. https://doi.org/10.1016/j.bbi.2019.05.029 (2019). J. Neurol. According to the National Multiple Sclerosis Society, one commonality among all forms of MS is the autoimmune destruction of the myelin sheath that protects nerve fibers. Since the early days of the COVID-19 vaccination program, disinformation claiming that the vaccines can induce multiple sclerosis (MS) has swirled around social media . Ongoing oxidative stress causes subclinical neuronal dysfunction in the recovery phase of EAE. Medical conditions that affect the gastrointestinal tract that can cause stomach burning include: 2. Autologous mesenchymal stem cells for the treatment of secondary progressive multiple sclerosis: an open-label phase 2a proof-of-concept study. JAMA Neurol. 4, 55–62 (1998). PubMed Central  74, 848–861 (2013). Sci. Acta 1841, 745–758 (2014). B cells produce proteins known as antibodies that can bind to antigens. 72, 1407–1408 (2015). Burgoon MP, Gilden DH, Owens GP. June 6, 2023. PLOS ONE 8, e57820 (2013). 81, 93–107 (2015). volume 18, pages 905–922 (2019)Cite this article. Recent genome-wide association studies revealed new susceptibility alleles for MS besides the HLA complex that are all relate … Relapsing MS is characterized by episodes of neurological dysfunction with a variable degree of recovery after a new bout of dysfunction. Manage symptoms and provide supportive care, such as medications for symptom control or physical therapy for mobility and function. Neurol. Glia 57, 467–478 (2009). Correspondence to Haider, L. et al. Kiryu-Seo, S., Ohno, N., Kidd, G. J., Komuro, H. & Trapp, B. D. Demyelination increases axonal stationary mitochondrial size and the speed of axonal mitochondrial transport. Lesions in the CNS occur at different times and in different CNS locations. 2013;333(1-2):1-4. doi:10.1016/j.jns.2013.05.010, 11. Fox, R. J. et al. The symptoms and progression of demyelinating diseases varies between patients. the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in Cadavid, D. et al. 2007;79:589-620. doi:10.1016/S0074-7742(07)79026-8, 10. Brain 136, 106–115 (2013). In MS, B cells produce autoantibodies that bind to self-antigens, thereby causing autoimmune damage to the CNS. You are using a browser version with limited support for CSS. 46, 865–869 (2000). Lassmann, H., van Horssen, J. This article will review the basics of the central nervous system and the pathophysiology of MS. MS is an autoimmune disorder that affects different parts of the central nervous system. Axonal transection in the lesions of multiple sclerosis. 2009;132(5):1175-1189. doi:10.1093/brain/awp070, 12. A case study presenting the pathophysiology, diagnosis, and treatment of Multiple Sclerosis. Management and Treatment. Sci. An important and comprehensive discussion on optimal trial design in progressive MS. Stys, P. K., Zamponi, G. W., van Minnen, J. Neurology 85, 325–330 (2015). (CIS). Rather, their symptoms gradually accumulate over the course of the disease. Article  This trial showed reduced brain atrophy in progressive MS upon ibudilast treatment. Dietary iron and the integrity of the developing rat brain: a study with the artificially-reared rat pup. She is an accomplished oncology scientist with 10+ years of experience in developing and managing R&D projects and research staff directed to the development of small proteins fit for medical use. Magliozzi, R. et al. Another is the formation of lesions — damage or scarring — in the central nervous system (CNS). The exact cause of MS is still unknown, and researchers do not completely understand what causes the autoimmune response against the CNS. Research has shown B-cell therapy effects on MS and that the disease can no longer be understood as only a T-cell disease.16 B cells have indeed an important role in MS pathology, from antigen presentation to autoantibody production. Mood problems, such as depression, anxiety or mood swings. Immunol. Multiple sclerosis is an inflammatory demyelinating disease of the CNS in which activated immune cells invade the central nervous system and cause inflammation, neurodegeneration, and tissue damage.The underlying cause is currently unknown. Transl. Brain 134, 1914–1924 (2011). Rheumatol. Spicy food. Cortical demyelination and diffuse white matter injury in multiple sclerosis. Nat. Understanding the basics of the CNS can better help you understand the pathophysiology of MS. Early and accurate diagnosis is crucial and is supported by diagnostic criteria, incorporating imaging and spinal fluid abnormalities for . Biophys. Although substantial progress has been made in drug . Immunity 41, 886–897 (2014). 8, 532–533 (2002). Multiple sclerosis (MS) is an immune-mediated inflammatory disease that attacks myelinated axons in the central nervous system, destroying the myelin and the axon in variable degrees and producing significant physical disability within 20-25 years in more than 30% of patients. Brain 134, 1901–1913 (2011). Komori, M. et al. Rice, C. M. et al. Opin. 2008;372(9648):1502-17. doi:10.1016/S0140-6736(08)61620-7, 2. 78, 3–20 (2015). Front. Free Radic. Front Biosci. Systematic screening of generic drugs for progressive multiple sclerosis identifies clomipramine as a promising therapeutic. Slow expansion of multiple sclerosis iron rim lesions: pathology and 7T magnetic resonance imaging. Radbruch, H. et al. Klaus Schmierer, MB BS, PhD, FRCP, defines the pathophysiology of multiple sclerosis (MS). Araki, M. et al. Neurol. White, M., Webster, G., O’Sullivan, D., Stone, S. & La Flamme, A. C. Targeting innate receptors with MIS416 reshapes Th responses and suppresses CNS disease in a mouse model of multiple sclerosis. MacMillan, E. L. et al. Psychiatry 85, 1386–1395 (2014). Neurol. 9, 3116 (2018). Ann Neurol. Recirculating intestinal IgA-producing cells regulate neuroinflammation via IL-10. Scler. Stoffels, J. M. et al. A comprehensive summary of potential remyelinating medications. A range of symptomatic problems…. Kutzelnigg, A. An area in the grey matter without obvious lesions. GZ402668, a next-generation anti-CD52 antibody, displays decreased proinflammatory cytokine release in vitro. His department has received grant support from Bayer Schering, BiogenIdec, Genzyme, Merck Serono, Novartis and Teva. 14, 208–223 (2015). Abstract. Molecular changes in neurons in multiple sclerosis: altered axonal expression of Nav1.2 and Nav1.6 sodium channels and Na+/Ca2+ exchanger. Nat. for only 13.00 11.05/page. Exp. Naegelin, Y. et al. Activated microglia affect the nigro-striatal dopamine neurons differently in neonatal and aged mice treated with 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine. Association of initial disease-modifying therapy with later conversion to secondary progressive multiple sclerosis. Witte, M. E., Geurts, J. J., de Vries, H. E., van der Valk, P. & van Horssen, J. Mitochondrial dysfunction: a potential link between neuroinflammation and neurodegeneration? R.G. Targeting ASIC1 in primary progressive multiple sclerosis: evidence of neuroprotection with amiloride. 67, 707–714 (2010). There is sometimes a gradual worsening of disease, but in some people, the disease can remain inactive. MS is typically characterized by inflammation, demyelination, and axonal loss.1 Axonal loss may not appear in the acute phase of the disease but may be the eventual cause of irreversible neurological deficits.1,5 As demyelination occurs, the conduction of electrical signals by neurons is compromised and patients show significant neurological disabilities as a result. Clin. Gene therapy with mitochondrial heat shock protein 70 suppresses visual loss and optic atrophy in experimental autoimmune encephalomyelitis. Mol. Although substantial progress has been made in drug development for relapsing–remitting MS, treatment of the progressive forms of the disease, which are characterized clinically by the accumulation of disability in the absence of relapses, remains unsatisfactory. Craner, M. J. et al. And that is related to the way the immune system essentially establishes itself or a separate, literally, immune system in the central nervous system that maintains the damaging activity of the various cell types involved in MS in the brain itself. This paper reviews the pathophysiology, diagnosis and treatment for MS. Our experts can deliver a Multiple Sclerosis: Pathophysiology, Diagnosis & Treatment essay. Neuron 84, 1183–1190 (2014). Waxman, S. G. Mechanisms of disease: sodium channels and neuroprotection in multiple sclerosis – current status. Neurol. Article  Immunol. Scler. Thank you for visiting nature.com. 122, 15–58 (2014). Nature Reviews Drug Discovery 2018;83(1):13-26. doi:10.1002/ana.2511917. Nat. Whereas there is little evidence to support a purely environmental . Brain 134, 2755–2771 (2011). Beeton, C. et al. This disease alters the normal pathophysiology of the human body. Lucchinetti, C. et al. A subset of newly synthesized polypeptides in mitochondria from human endothelial cells exposed to hydroperoxide stress. There are two types of lymphocytes, B cells and T cells. Neurobiol. In MS, B cells, Most of the damage caused during MS attacks, According to the National Multiple Sclerosis Society, one commonality among all. Mod. This material may not be published, broadcast, rewritten or redistributed in any form without prior authorization. J. Neuroimmunol. When we talk about our lives with a sympathetic listener, we may say things we never thought of before. Strassburger-Krogias, K. et al. Burt, R. K. et al. Komori, M. et al. & Chataway, J. 305, 212–218 (2003). Medications that can cause stomach burning: Non-steroidal anti-inflammatory drugs (NSAIDs) Some antibiotics. Safety and feasibility of autologous bone marrow cellular therapy in relapsing-progressive multiple sclerosis. This is one of the most common symptoms of MS. Natl Acad. It is made up of a tightly packed layer of cells that act as a barrier, crossing over from the blood vessels and into the brain. Neurobiol. Med. https://doi.org/10.1038/s41573-019-0035-2. Diarrhea. & Fugger, L. Mechanisms of neurodegeneration and axonal dysfunction in multiple sclerosis. 2013;13(12 Suppl):3-9. doi:10.1586/14737175.2013.865866, 4. Multiple sclerosis (MS) is an autoimmune disease of the central nervous system (CNS) characterized by chronic inflammation, demyelination, gliosis, and neuronal loss. However, there are some slight differences in pathophysiology depending on the type of MS a person has been diagnosed with. pathophysiological hallmark of multiple sclerosis (MS), Multiple Sclerosis: Pathology, Diagnosis and Treatments — Experimental Therapeutic Medicine, Neurodegenerative Diseases — Nature Portfolio, Blood-Brain Barrier — Multiple Sclerosis Trust, B and T Cells Driving Multiple Sclerosis: Identity, Mechanisms and Potential Triggers — Frontiers in Immunology, The Role of B Cells and Antibodies in Multiple Sclerosis, Neuromyelitis Optica, and Related Disorders — Frontiers in Immunology, Pathology of Multiple Sclerosis: Where Do We Stand? Pathophysiology can also refer to the hallmarks of a disease that lead to these functional changes. Steelman, A. J. Giuliani, F., Hader, W. & Yong, V. W. Minocycline attenuates T cell and microglia activity to impair cytokine production in T cell-microglia interaction. 22, 1719–1731 (2016). Increased mitochondrial content in remyelinated axons: implications for multiple sclerosis. Article  B-cells and plasma cells are also present.10 Even though RRMS and progressive MS are both characterized by inflammatory changes, this event is more pronounced in RRMS. MS appears as abrupt onset of focal sensory disturbances that is accompanied by unilateral painless damage of vision . The loss of myelin causes a loss of nerve conductivity and eventual death of neurons. Rev. Causes Multiple sclerosis. The blood-brain barrier (BBB) is in place to prevent certain cells, substances, and disease-causing agents — such as viruses and bacteria — from entering the brain through the blood. In order to confirm diagnosis of MS, the provider must first rule out other neurodegenerative diseases. This is then followed by periods of remission. Weigel, K. J., Lynch, S. G. & LeVine, S. M. Iron chelation and multiple sclerosis. Neurol Sci. MS is a neurodegenerative disease caused by the autoimmune destruction of the protective myelin sheath covering axons. Pitt, D., Werner, P. & Raine, C. S. Glutamate excitotoxicity in a model of multiple sclerosis. 1998;338(5):278-285. doi:10.1056/NEJM199801293380502, 6. 25, 308–315 (2003). It is made up of a tightly packed layer of cells that act as a barrier, crossing over from the blood vessels and into the brain. Schenkel, J. M. & Masopust, D. Tissue-resident memory T cells. 13, 507–514 (2012). Nat. Selective blockade of T lymphocyte K(+) channels ameliorates experimental autoimmune encephalomyelitis, a model for multiple sclerosis. A key neuropathological study, demonstrating the link between meningeal inflammation and cortical neurodegeneration. 87, 679–685 (2010). Brain 135, 2925–2937 (2012). Lancet Neurol. Lisak, R. P., Nedelkoska, L. & Benjamins, J. Black, Asian, and Hispanic individuals may be at risk for more severe MS-related disability. For example, also we find less gadolinium-enhancing lesions in the later stages of the disease. The CD8+ T-cells are believed to drive direct axonal injury to MHC I/antigen expressing cells such as neurons and oligodendrocytes (McCance & Huether, 2014).