Autoimmunity in Alzheimer's disease as evidenced by plasma immunoreactivity against RAGE and Abeta42: complication of diabetes.

Abstract:

:Features of autoimmunity have been associated with both Alzheimer's disease (AD) and with diabetes. In both diseases high levels of advanced glycation end products (AGEs) and their receptor (RAGE) have been detected in tissues and in the circulation. In addition high titers of antibodies directed against a RAGE-like peptide occur in the circulation. In this study we report the presence of auto-antibodies directed against RAGE and the cytotoxic amyloid peptide Abeta42 in plasma samples derived from four study groups. Anti-RAGE IgG titers were greatest in the AD-diabetic cohort. They were followed in decreasing order by the AD-non-diabetic cohort, the elderly diabetic cohort, and lastly by the control non-diabetic elderly cohort. The same profile of IgG differences was evident for the anti-Abeta42 titers. When all of the data were combined, there was a strong linear correlation between the RAGE and Abeta42 titers suggesting that the two peptides exist as a tight complex in plasma. Plasma IgG titers were not correlated with cognitive status except that AD and AD-diabetic participants were significantly cognitively impaired relative to the two non-AD groups. There also was no significant correlation between IgG titers and subject age, except that there was a trend for a negative slope for the AD participants and a positive slope for the control participants. In keeping with the human data, we also report that chemically-induced diabetes in rats was associated with high levels of AGEs, anti-RAGE-like IgGs, and anti-Abeta42-like IgGs. For non-diabetic rats, there was a clear age-dependency regarding the magnitude of the IgG levels. These data support the concept of an interrelationship between diabetes and AD. For both diseases one underlying contributing factor to cytotoxicity could be the development of an autoimmune response triggered by the presence of AGEs and amyloid peptides.

journal_name

Curr Alzheimer Res

authors

Mruthinti S,Schade RF,Harrell DU,Gulati NK,Swamy-Mruthinti S,Lee GP,Buccafusco JJ

doi

10.2174/156720506777632899

subject

Has Abstract

pub_date

2006-07-01 00:00:00

pages

229-35

issue

3

eissn

1567-2050

issn

1875-5828

journal_volume

3

pub_type

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