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B cells and antibodies in the pathogenesis of myelin injury in Semliki Forest Virus encephalomyelitis.

Abstract：

:To determine the contribution of B cells to brain myelin injury in Semliki Forest Virus (SFV) encephalomyelitis, normal C57BL/6 (B6) and B-cell-deficient (C57BL/6-tm1Cgn) B6 mice were infected with SFV. The peak of clinical disease, i.e., the time at which the greatest proportions of mice had moderate to severe clinical signs, appeared earlier in B6 mice [day 7 postinfection (pi)] than in B-cell-deficient mice (day 21 pi). By flow cytometry, no clear differences were found in the percentages of CD3(+)CD4(+) T cells in the brains of B6 and B-cell-deficient mice. However, by day 21 pi, percentages of CD3(+)CD8(+) T cells were greater in brains of B-cell-deficient than in those of B6 mice. On day 21 pi, percentages of CD19(+) B cells were maximal in B6 mice, but B cells were absent in B-cell-deficient mice at all time points. Sera obtained from B6 mice showed antibody responses to SFV, to SFV E2 peptides p137-151 and p115-133, and to peptides of myelin oligodendrocyte glycoprotein p18-32 and myelin basic protein (MBP) p64-75. Sera obtained from B-cell-deficient mice showed minimal or no reactivity to SFV, E2, or myelin peptides. CNS inflammatory and PAS-positive macrophage foci were maximal on days 7-14 pi in all mice. Additionally, B6 mice had brain white matter vacuolation, whereas B-cell-deficient mice did not. These data suggest that brain infiltrating B cells and anti-myelin antibodies contribute to myelin injury in SFV encephalomyelitis.

journal_name

Cell Immunol

journal_title

Cellular immunology

authors

Smith-Norowitz TA,Sobel RA,Mokhtarian F

doi

10.1006/cimm.2000.1613

subject

Has Abstract

pub_date

2000-02-25 00:00:00

pages

27-35

issue

1

eissn

0008-8749

issn

1090-2163

pii

S0008-8749(00)91613-7

journal_volume

200

pub_type

杂志文章

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