Print version ISSN 0004-282X
Arq. Neuro-Psiquiatr. vol.70 no.8 São Paulo Aug. 2012
Bandas IgG oligoclonais no líquido cefalorraquidiano na esclerose múltipla: o que isso significa?
PhD; Neurologist, Cerebrospinal Fluid Specialist; Professor at Federal University of Rio de Janeiro State (Unirio), Federal University of Rio de Janeiro (UFRJ) and at Neurolife, Rio de Janeiro RJ, Brazil
Multiple sclerosis (MS) is a chronic inflammatory demyelinating disease of the central nervous system (CNS). Presence of plaques is the main pathological feature of MS, occurring in myelinated axons within the CNS (brain and spinal cord). MS is classified as relapsing-remitting MS (RRMS) characterized by attacks, whose symptoms occur so suddenly with subsequent partial or complete recovery; primary-progressive MS (PPMS) with progressive symptoms accumulated over time; and secondary-progressive MS (SPMS), after the initial form of RRMS. The most common type of MS is the relapsing-remitting (when attacks may sequelae or not)1,2.
MS diagnosis should be based on clinical picture, but as other CNS disorders may cause similar symptoms, it is necessary to perform additional tests, such as magnetic resonance imaging (MRI) of the brain, evoked potentials, together with an analysis of the cerebrospinal fluid (CSF)1,2.
The CSF analysis is an important tool for MS diagnosis. It reveals mild mononuclear pleocytosis, increased protein levels, and intrathecal synthesis of immunoglobulins. The oligoclonal IgG bands are synthesized in the CNS by B-lymphocytes located near the areas of demyelination, throughout the disease course. Two or more oligoclonal IgG bands found in the CSF, which were not observed in corresponding serum, are a proof of local synthesis. It contributes to the monitoring of inflammatory processes in the CNS. A Brazilian pioneering study showed the presence of CSF oligoclonal IgG bands in 85% of patients with definite MS3. However, it may found up to 95% of cases utilizing isoelectric focusing with IgG immunoblotting2. Therefore, the test has a high predictive negative value. It does not represent a disease marker, considering that it is not specific for MS, since it may be found in other neurological disorders of the CNS2-4.
Demonstration of oligoclonal IgG bands locally synthesized has been used more recently for the MS prognostic evaluation. Studies haved showed that patients with positive oligoclonal IgG bands have a worse prognosis in comparison to those with negative bands, and the risk of progression to a second attack is doubled, as well as cases of clinically isolated syndrome (CIS) present increased risk of developing MS5-7.
The Journal "Arquivos de Neuro-psiquiatria" presents a very interesting study of Juan Ignacio Rojas et al.8 on the association between the presence of oligoclonal bands in CSF of RRMS patients and brain atrophy (seen on MRI), in the onset of the disease. The work was conducted at the MS Center at the Hospital Italiano de Buenos Aires, Argentina, from June 2006 to June 2010. Of a total of 40 patients, 29 (72.5%) had positive oligoclonal IgG bands in CSF and showed reduction in the brain gray substance. The authors suggest that the presence of oligoclonal bands in CSF predicts a worse disease course in MS patients, considering that it is more frequently associated with the presence of neurodegenerative lesions in the initial stage of the disease.
In conclusion, the examination of oligoclonal IgG bands is strongly recommended for MS diagnosis, and it seems to be of value as a prognostic factor.
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5. Joseph FG, Hirst CL, Pickersgill TP, Ben-Shlomo Y, Robertson NP, Scolding NJ. CSF oligoclonal band status informs prognosis in multiple sclerosis: a case control study of 100 patients. J Neurol Neurosurg Psychiatry 2009;80:292-296. [ Links ]
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8. Rojas JI, Patrucco L, Tizio S, Cristiano E. Oligoclonal bands in the cerebrospinal fluid and increased brain atrophy in early stages of relapsing-remitting multiple sclerosis. Arq Neuropsiquiatr 2012;70:574-577. [ Links ]
Praia do Flamengo 66 B / conjuntos 219-220 / Bloco B
22210-903 Rio de Janeiro RJ - Brasil
Received 08 July 2012
Accepted 16 July 2012
There is no conflict of interest to declare.