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2015 ; 6
(ä): 600
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Investigating the Antigen Specificity of Multiple Sclerosis Central Nervous
System-Derived Immunoglobulins
#MMPMID26648933
Willis SN
; Stathopoulos P
; Chastre A
; Compton SD
; Hafler DA
; O'Connor KC
Front Immunol
2015[]; 6
(ä): 600
PMID26648933
show ga
The central nervous system (CNS) of patients with multiple sclerosis (MS) is the
site where disease pathology is evident. Damaged CNS tissue is commonly
associated with immune cell infiltration. This infiltrate often includes B cells
that are found in multiple locations throughout the CNS, including the
cerebrospinal fluid (CSF), parenchyma, and the meninges, frequently forming
tertiary lymphoid structures in the latter. Several groups, including our own,
have shown that B cells from distinct locations within the MS CNS are clonally
related and display the characteristics of an antigen-driven response. However,
the antigen(s) driving this response have yet to be conclusively defined. To
explore the antigen specificity of the MS B cell response, we produced
recombinant human immunoglobulin (rIgG) from a series of expanded B cell clones
that we isolated from the CNS tissue of six MS brains. The specificity of these
MS-derived rIgG and control rIgG derived from non-MS tissues was then examined
using multiple methodologies that included testing individual candidate antigens,
screening with high-throughput antigen arrays and evaluating binding to
CNS-derived cell lines. We report that while several MS-derived rIgG recognized
particular antigens, including neurofilament light and a protocadherin isoform,
none were unique to MS, as non-MS-derived rIgG used as controls invariably
displayed similar binding specificities. We conclude that while MS CNS resident B
cells display the characteristics of an antigen-driven B cell response, the
antigen(s) driving this response remain at large.