Aβ anti-idiotypic antibodies are present in intravenous immunoglobulin and are produced in mice following its administration.

Abstract:

:The effects of intravenous immunoglobulin (IVIG) products were recently examined in patients with Alzheimer's disease (AD). Although encouraging results were obtained in pilot studies, later trials produced negative results. The rationale for these studies was that IVIG contains antibodies to amyloid-beta (Aβ). However, if Aβ anti-idiotypic antibodies (antibodies which bind to anti-Aβ antibodies) are present in IVIG or induced by its administration, these antibodies could potentially reduce its neuroprotective effects in AD. The objective of this study was to determine if IVIG contained such antibodies. Enzyme-linked immunosorbent assays (ELISAs) measured specific binding of IVIG Gamunex to purified human anti-Aβ IgG. The mean concentration of its Aβ anti-idiotypic antibodies in four experiments was 1.85 μg/mL (18.5 μg/g IgG; range = 1.82-1.89 μg/mL [18.2-18.9 μg/g IgG]), and their mean percentage of specific binding was 72.2% (range = 68.3-75.3%). We then performed ELISAs to determine if antibodies to purified human anti-Aβ were produced in C57BL/6 mice injected with the IVIG product Gammagard in an earlier study. After subtracting the expected immune response to normal human immunoglobulins, the median concentrations of these antibodies were 15.6 ng/mL (range = 1.2-108.2 ng/mL) in pre-treatment sera and 2419.4 ng/mL (range = 327.4-8478.4 ng/mL) in post-treatment sera. These results indicate that specific Aβ anti-idiotypic antibodies are detectable in IVIG and may be induced in mice by its administration. The presence of Aβ anti-idiotypic antibodies in IVIG products might decrease neuroprotective effects of their anti-Aβ antibodies in AD.

journal_name

Autoimmunity

journal_title

Autoimmunity

authors

Loeffler DA,Klaver AC,Coffey MP

doi

10.3109/08916934.2014.983265

subject

Has Abstract

pub_date

2015-06-01 00:00:00

pages

196-200

issue

4

eissn

0891-6934

issn

1607-842X

journal_volume

48

pub_type

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