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Dorè D, Winzenberg T, Ding C, Otahal P, Pelletier J, Martel-Pelletier J, Cicuttini F, Jones G. The association between objectively measured physical activity and knee structural change using magnetic resonance imaging (MRI). J Sci Med Sport 2012. [DOI: 10.1016/j.jsams.2012.11.591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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52
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Ayata K, Müller T, Dürk T, Grimm M, Baudiss K, Vieira R, Cicko S, Zech A, Sorichter S, Pelletier J, Sevigny J, Idzko M, Robson S. Attenuated allergic airway inflammation in Cd39-/- mice. Pneumologie 2012. [DOI: 10.1055/s-0032-1329797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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53
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Yenikoye A, Pelletier J, Andre D, Mariana JC. Anomalies in ovarian function of peulh ewes. Theriogenology 2012; 17:355-64. [PMID: 16725697 DOI: 10.1016/0093-691x(82)90015-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/1981] [Accepted: 02/11/1982] [Indexed: 11/21/2022]
Abstract
The ovarian activity of 8 Niger Peulh ewes was followed for 2 1 2 years by assaying the levels of progesterone in blood plasma sampled daily and by endoscopic observation. Although the ewes did not experience seasonal anestrus, their cycles were not regular. Most animals had persistent corpora lutea at some stage, but particularly in June. This resulted in cycles averaging 49.9+/-6.8 days in length instead of the normal 16.9+/-0.1 days. Intervals between successive luteal phases lasted 4-15 days as compared with 2.3+/-0.06 days seen in normal cycles. This occurred in most ewes at least once during the period from December to April. In these cases, the preovulatory discharge of LH was delayed until 7.5+/-1.8 days after the fall in the level of progesterone. The incidence of these anomalies suggests that the ewes had 69% of the ovulations and 56% of the behavioral estrus as compared to ewes that cycled regularly.
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Bine S, Haziot A, Malikova I, Pelletier J, Charron D, Boucraut J, Mooney N, Gelin C. Alteration of CD1 expression in multiple sclerosis. Clin Exp Immunol 2012; 169:10-6. [PMID: 22670773 DOI: 10.1111/j.1365-2249.2012.04586.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
Studies of multiple sclerosis (MS) have concentrated mainly on antigen presentation of peptides derived from the myelin sheath, while the implication of lipid antigen has been less explored in this pathology. As the extracellular environment regulates expression of the lipid antigen-presenting molecule CD1, we have examined whether sera from patients alters CD1 surface expression in monocyte-derived dendritic cells. We have shown that: (i) CD1 group 1 proteins were highly expressed in the presence of MS sera; (ii) sera from MS patients differentially regulated CD1 group 1 versus CD1 group 2 molecular expression; and (iii) CD1 was expressed strongly in monocytes from MS patients under immunosuppressive treatment. Overall, these results reveal that CD1 expression is modified in MS and provide novel information on the regulation of lipid antigen presentation in myeloid cells.
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Zaki MA, Samoylenko V, Khan S, Abd slam RM, Hetta MH, Shin U, Pelletier J, Walker LA, Muhammad I. Anticancer activity of resveratrol analogs from Eugenia rigida DC. PLANTA MEDICA 2012; 78. [DOI: 10.1055/s-0032-1321001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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56
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Calabresi P, Kieseier B, Arnold D, Balcer L, Boyko A, Pelletier J, Zhu Y, Deykin A. ADVANCE Phase 3 Study of PEGylated Interferon Beta-1a for Relapsing Multiple Sclerosis: Patient Baseline Characteristics (P01.133). Neurology 2012. [DOI: 10.1212/wnl.78.1_meetingabstracts.p01.133] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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57
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Noronha-Matos JB, Costa MA, Magalhães-Cardoso MT, Ferreirinha F, Pelletier J, Freitas R, Neves JM, Sévigny J, Correia-de-Sá P. Role of ecto-NTPDases on UDP-sensitive P2Y(6) receptor activation during osteogenic differentiation of primary bone marrow stromal cells from postmenopausal women. J Cell Physiol 2012; 227:2694-709. [PMID: 21898410 DOI: 10.1002/jcp.23014] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
This study aimed at investigating the expression and function of uracil nucleotide-sensitive receptors (P2Y(2), P2Y(4), and P2Y(6)) on osteogenic differentiation of human bone marrow stromal cells (BMSCs) in culture. Bone marrow specimens were obtained from postmenopausal female patients (68 ± 5 years old, n = 18) undergoing total hip arthroplasty. UTP and UDP (100 µM) facilitated osteogenic differentiation of the cells measured as increases in alkaline phosphatase (ALP) activity, without affecting cell proliferation. Uracil nucleotides concentration-dependently increased [Ca(2+)](i) in BMSCs; their effects became less evident with time (7 > 21 days) of the cells in culture. Selective activation of P2Y(6) receptors with the stable UDP analog, PSB 0474, mimicked the effects of both UTP and UDP, whereas UTPγS was devoid of effect. Selective blockade of P2Y(6) receptors with MRS 2578 prevented [Ca(2+)](i) rises and osteogenic differentiation caused by UDP at all culture time points. BMSCs are immunoreactive against P2Y(2), P2Y(4), and P2Y(6) receptors. While the expression of P2Y(6) receptors remained fairly constant (7∼21 days), P2Y(2) and P2Y(4) became evident only in less proliferative and more differentiated cultures (7 < 21 days). The rate of extracellular UTP and UDP inactivation was higher in less proliferative and more differentiated cell populations. Immunoreactivity against NTPDase1, -2, and -3 rises as cells differentiate (7 < 21 days). Data show that uracil nucleotides are important regulators of osteogenic cells differentiation predominantly through the activation of UDP-sensitive P2Y(6) receptors coupled to increases in [Ca(2+)](i) . Endogenous actions of uracil nucleotides may be balanced through specific NTPDases determining whether osteoblast progenitors are driven into proliferation or differentiation.
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58
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Nasr Z, Robert F, Porco JA, Muller WJ, Pelletier J. eIF4F suppression in breast cancer affects maintenance and progression. Oncogene 2012; 32:861-71. [PMID: 22484424 DOI: 10.1038/onc.2012.105] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Levels of eukaryotic initiation factor 4E (eIF4E) are frequently elevated in human cancers and in some instances have been associated with poor prognosis and outcome. Here we utilize transgenic and allograft breast cancer models to demonstrate that increased mammalian target of rapamycin (mTOR) signalling can be a significant contributor to breast cancer progression in vivo. Suppressing mTOR activity, as well as levels and activity of the downstream translation regulators, eIF4E and eIF4A, delayed breast cancer progression, onset of associated pulmonary metastasis in vivo and breast cancer cell invasion and migration in vitro. Translation of vascular endothelial growth factor (VEGF), matrix metallopeptidase 9 (MMP9) and cyclin D1 mRNAs, which encode products associated with the metastatic phenotype, is inhibited upon eIF4E suppression. Our results indicate that the mTOR/eIF4F axis is an important contributor to tumor maintenance and progression programs in breast cancer. Targeting this pathway may be of therapeutic benefit.
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Audoin B, Crespy L, Zaaraoui W, Lemaire M, Jure L, Rico A, Faivre A, Reuter F, Malikova I, Cozzone P, Ranjeva JP, Pelletier J. Détection des anomalies individuelles de la substance grise au stade précoce de la sclérose en plaques par cartographie statistique des cartes de taux de transfert d’aimantation. Rev Neurol (Paris) 2012. [DOI: 10.1016/j.neurol.2012.01.511] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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60
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Robinet E, Audoin B, Malikova I, Reuter F, Mathey G, Rico A, Zaaraoui W, Confort-Gouny S, Ranjeva J, Pelletier J. Étude de la plasticité cérébrale structurale induite par la rééducation dans la sclérose en plaques. Rev Neurol (Paris) 2012. [DOI: 10.1016/s0035-3787(12)70021-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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61
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Liu X, Yu L, Wang Q, Pelletier J, Fausther M, Sévigny J, Malmström HS, Dirksen RT, Ren YF. Expression of ecto-ATPase NTPDase2 in human dental pulp. J Dent Res 2011; 91:261-7. [PMID: 22173326 DOI: 10.1177/0022034511431582] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Dental pulpal nerve fibers express ionotropic adenosine triphosphate (ATP) receptors, suggesting that ATP signaling participates in the process of dental nociception. In this study, we investigated if the principal enzymes responsible for extracellular ATP hydrolysis, namely, nucleoside triphosphate diphosphohydrolases (NTPDases), are present in human dental pulp. Immunohistochemical and immunofluorescence experiments showed that NTPDase2 was predominantly expressed in pulpal nerve bundles, Raschkow's nerve plexus, and in the odontoblast layer. NTPDase2 was expressed in pulpal Schwann cells, with processes accompanying the nerve fibers and projecting into the odontoblast layer. Odontoblasts expressed the gap junction protein, connexin43, which can form transmembrane hemichannels for ATP release. NTPDase2 was localized close to connexin43 within the odontoblast layer. These findings provide evidence for the existence of an apparatus for ATP release and degradation in human dental pulp, consistent with the involvement of ATP signaling in the process of dentin sensitivity and dental pain.
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Pelletier J, Dayan F, Durivault J, Ilc K, Pécou E, Pouysségur J, Mazure NM. The asparaginyl hydroxylase factor-inhibiting HIF is essential for tumor growth through suppression of the p53–p21 axis. Oncogene 2011; 31:2989-3001. [DOI: 10.1038/onc.2011.471] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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63
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Huxman T, Troch P, Chorover J, Breshears DD, Saleska S, Pelletier J, Zeng X. The Hills Are Alive: Earth Science in a Controlled Environment. ACTA ACUST UNITED AC 2011. [DOI: 10.1029/2009eo140003] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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64
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Collongues N, Marignier R, Zéphir H, Blanc F, Vukusic S, Outteryck O, Fleury M, Ruet A, Borgel F, Thouvenot E, Moreau T, Defer G, Derache N, Pelletier J, Audoin B, Debouverie M, Labauge P, Gout O, Camu W, Brassat D, Brochet B, Vermersch P, Confavreux C, Seze JD. High-risk syndrome for neuromyelitis optica: a descriptive and comparative study. Mult Scler 2011; 17:720-4. [DOI: 10.1177/1352458510396923] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background: Neuromyelitis optica (NMO) frequently begins with a monofocal episode of optic neuritis or myelitis. A concept named high-risk syndrome (HRS) for NMO has been proposed for patients with monofocal episodes and NMO-IgG antibodies. Objective: To describe HRS patients and compare them with NMO patients. Methods: We identified 30 patients with HRS: 18 with extensive myelitis (HRM) and 12 with optic neuritis (HRON), in a database pooling patients from 25 centres in France. Clinical, laboratory/magnetic resonance imaging (MRI) data and outcome were analysed and compared with a national cohort of 125 NMO patients extracted from the same database. Results: Mean follow-up was 4.8 years. Mean age at onset was 42.8 years (range: 12.4–70) with a female:male ratio of 0.9. Asymptomatic lesions were report on visual evoked potentials in 4/8 tested HRM patients and on spinal cord MRI in 2/7 HRON patients. Three patients died, two owing to a cervical lesion. HRS and NMO patients had similar clinical/paraclinical data, except for a predominance of men in the HRS group and a later mean age at onset in the HRM subgroup. Conclusion: The description of HRS patients is compatible with a monofocal form of NMO. Asymptomatic lesions could be included in a new set of NMO diagnostic criteria.
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Bolzinger M, Bolot C, Galy G, Chabanel A, Pelletier J, Briançon S. Skin contamination by radiopharmaceuticals and decontamination strategies. Int J Pharm 2010; 402:44-9. [DOI: 10.1016/j.ijpharm.2010.09.027] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2010] [Revised: 09/21/2010] [Accepted: 09/22/2010] [Indexed: 11/28/2022]
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66
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Reuter F, Baumstarck-Barrau K, Loundou A, Pelletier J, Auquier P. Paced Auditory Serial Addition Test : données normatives dans une population française. Rev Neurol (Paris) 2010; 166:944-7. [DOI: 10.1016/j.neurol.2010.01.018] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2009] [Revised: 11/09/2009] [Accepted: 01/30/2010] [Indexed: 11/25/2022]
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67
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Collongues N, Marignier R, Zéphir H, Papeix C, Fontaine B, Blanc F, Rodriguez D, Fleury M, Vukusic S, Pelletier J, Audoin B, Thouvenot E, Camu W, Barroso B, Ruet A, Brochet B, Vermersch P, Confavreux C, de Seze J. Long-term follow-up of neuromyelitis optica with a pediatric onset. Neurology 2010; 75:1084-8. [PMID: 20855851 DOI: 10.1212/wnl.0b013e3181f39a66] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND Neuromyelitis optica (NMO) is a rare inflammatory disease. Average age at onset is 35 years. Few data exist on patients with pediatric-onset NMO (p-NMO), with disease onset before age 18 years. We report the clinical and paraclinical features and long-term outcome of patients with p-NMO and compare them with a large adult-onset NMO (a-NMO) cohort. METHODS We performed a retrospective, multicenter study of patients with p-NMO in pediatric and adult medical centers. We identified 125 patients with NMO (12 p-NMO; 113 a-NMO) fulfilling the 2006 criteria. Data were collected using hospital files and standardized assessment forms for NMO. RESULTS Patients with p-NMO were followed up during a mean 19.3 years. Median age at onset was 14.5 years (4.1-17.9) with a female:male ratio of 3:1. Three patients (25%) fulfilled Paty criteria for multiple sclerosis on first brain MRI, including one patient with acute disseminated encephalomyelitis. Median interval between onset and residual Expanded Disability Status Scale (EDSS) score 4 was 20.7 years, score 6 was 26 years, and score 7 was 28.7 years. Median interval between onset and residual visual loss ≤1/10 was 1.3 years. Compared with a-NMO, p-NMO showed a longer time to EDSS scores 4 and 6, largely explained by the severity of the first myelitis in the a-NMO group. Time to first treatment was longer in the p-NMO group (13.1 vs 3.4 years). CONCLUSION Patients with p-NMO can present a diffuse inflammatory process on first brain MRI and have a longer time to disability than patients with a-NMO.
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Bourgeois S, Bolzinger M, Pelletier J, Valour J, Briançon S. Caffeine microspheres - an attractive carrier for optimum skin penetration. Int J Cosmet Sci 2010. [DOI: 10.1111/j.1468-2494.2010.00589_1.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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69
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Vettor M, Bourgeois S, Fessi H, Pelletier J, Perugini P, Pavanetto F, Bolzinger MA. Skin absorption studies of octyl-methoxycinnamate loaded poly(D,L-lactide) nanoparticles: Estimation of the UV filter distribution and release behaviour in skin layers. J Microencapsul 2010; 27:253-62. [DOI: 10.3109/10717540903097770] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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70
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Collongues N, Marignier R, Zéphir H, Papeix C, Blanc F, Ritleng C, Tchikviladzé M, Outteryck O, Vukusic S, Fleury M, Fontaine B, Brassat D, Clanet M, Milh M, Pelletier J, Audoin B, Ruet A, Lebrun-Frenay C, Thouvenot E, Camu W, Debouverie M, Créange A, Moreau T, Labauge P, Castelnovo G, Edan G, Le Page E, Defer G, Barroso B, Heinzlef O, Gout O, Rodriguez D, Wiertlewski S, Laplaud D, Borgel F, Tourniaire P, Grimaud J, Brochet B, Vermersch P, Confavreux C, de Seze J. Neuromyelitis optica in France: a multicenter study of 125 patients. Neurology 2010; 74:736-42. [PMID: 20194912 DOI: 10.1212/wnl.0b013e3181d31e35] [Citation(s) in RCA: 158] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
BACKGROUND There have been few epidemiologic studies on neuromyelitis optica (NMO) and none used the recent 2006 diagnostic criteria. Here we describe the clinical, laboratory, MRI, and disability course of NMO in a French cohort of 125 patients. METHODS We performed an observational, retrospective, multicenter study. Data were collected from September 2007 through August 2008, corresponding to the endpoint of the study. We identified 125 patients fulfilling the 2006 NMO criteria. Selection was made using hospital files and a specific clinical questionnaire for NMO. RESULTS Mean age at onset was 34.5 years (range 4-66) with a mean disease duration of 10 +/- 7.8 years at the endpoint. The patients were mainly (87%) Caucasian, with a female:male ratio of 3:1. In 90% of cases, the association of optic neuritis, longitudinal extensive myelitis, and a Paty-negative initial brain MRI was sufficient to fulfill the supportive criteria. Eighty-eight percent of patients were treated with immunosuppressive therapies. Median delay from onset to Expanded Disability Status Scale (EDSS) score 4 was 7 years; score 6, 10 years; and score 7, 21 years. The first episode of myelitis was immediately followed by an EDSS score > or = 4 in 37.3% of cases, and a severe residual visual loss was observed in 22% of patients after the first episode of optic neuritis. Multivariate analysis did not reveal any predictors of a poor evolution other than a high number of MRI brain lesions at diagnosis, which were predictive of a residual visual acuity < or = 1/10. CONCLUSIONS Our demographic data provide new data on disability in patients with neuromyelitis optica, most of whom were receiving treatment.
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71
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Sukarieh R, Sonenberg N, Pelletier J. Nuclear assortment of eIF4E coincides with shut-off of host protein synthesis upon poliovirus infection. J Gen Virol 2010; 91:1224-8. [DOI: 10.1099/vir.0.018069-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
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72
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Reuter F, Zaaraoui W, Rico A, Malikova I, Ranjeva JP, Audoin B, Pelletier J. Les troubles cognitifs au stade le plus précoce de la sclérose en plaques : réalité et devenir. Rev Neurol (Paris) 2010. [DOI: 10.1016/s0035-3787(10)70021-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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73
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Michel L, Foucher Y, De Sèze J, Vukusic S, Confavreux C, Brassat D, Clavelou P, Ouallet JC, Brochet B, Pelletier J, Labauge P, Lebrun C, Lefrere F, Jacq-Foucher M, Wiertlewski S, Laplaud DA. Étude rétrospective multicentrique évaluant le retentissement des traitements utilisés pour la fécondation in vitro sur le risque de poussées de Sclérose en plaques. Rev Neurol (Paris) 2010. [DOI: 10.1016/s0035-3787(10)70004-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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74
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Reuter F, Liégeois-Chauvel C, Marquis P, Del Cul A, Malikova I, Confort-Gouny S, Zaaraoui W, Cozzone J, Pelletier J, Dehaene S, Ranjeva J, Audoin B. Electrophysiological correlates of access to consciousness in early multiple sclerosis patients. Neuroimage 2009. [DOI: 10.1016/s1053-8119(09)70032-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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75
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Reuter F, Audoin B, Rico A, Malikova I, Ranjeva JP, Pelletier J. [Cognitive impairment]. Rev Neurol (Paris) 2009; 165 Suppl 4:S113-22. [PMID: 19361675 DOI: 10.1016/s0035-3787(09)72122-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Cognitive impairment is common in multiple sclerosis (MS), occurring at all stages of the disease, even at the earliest, and can be a major source of disability, social impairment, and impoverished quality of life. Cognitive dysfunction is mainly focused on working memory, conceptual reasoning, verbal fluency, speed of information processing, attention and executive function. Measures of information-processing speed appear to be the most robust and sensitive markers of cognitive impairment in MS patients. Cognitive testing in MS patients is complex and cognitive screening tests are time- and cost-saving test instruments. A comprehensive and sensitive cognitive test procedure should be administered to detect cognitive dysfunction, and recent studies demonstrate that single, predominantly speed-related cognitive tests may be superior to extensive and time-consuming test batteries in screening cognitive decline. Additional clinical factors, including disease course, fatigue, and affective disturbance, can impact the degree of MS-related cognitive impairment. Despite weak correlation with disease duration and physical disability status, the degree of cognitive impairment in MS has been related to the extent of topographically specific neuronal tissue damage and loss. Numerous studies have applied conventional and quantitative magnetic resonance imaging (MRI) techniques to correlate the profile and degree of cognitive impairment with various MRI-detectable abnormalities. The burden of MRI-visible lesions does not fully account for the degree of MS-related cognitive impairment. Nonconventional MRI findings suggest the extent of subtle tissue damage in normal-appearing white and grey matter to correlate best with the severity of cognitive impairment in MS patients. Structural MRI approaches have recently been extended by functional MRI studies scrutinizing the brain's ability for adaptive functional reorganization in the presence of widespread tissue damage. Cognitive impairment in MS seems to be not simply the result of tissue destruction, but also a balance between tissue destruction, tissue repair, and adaptive functional reorganization. These findings highlight the need to screen for cognitive deficits in MS patients to conduct potential cognitive rehabilitation intervention.
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