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The Potential Role Of Red Blood Cells In Amyloid Toxicity And Alzheimer?s Disease | 12472
ISSN: 2161-0460
Journal of Alzheimers Disease & Parkinsonism
Open Access
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Red Blood Cells (RBC) in the cerebral circulation are in intimate contact with the vascular system. We have shown that
amyloid fibrils are readily transferred between the vasculature and the circulating RBCs. Although RBCs take up amyloids,
the measured levels of RBC amyloids are very low. This is attributed to the transfer of amyloids back to the vasculature and the
relatively rapid removal from circulation of RBCs that retain amyloid. The transfer of amyloid from RBCs back to the vasculature
contributes to the spread of cerebral amyloid angiopathy found in Alzheimer?s disease (AD). The oxidative stress triggered while
the amyloid is still associated with RBCs, which is dramatically enhanced in the presence of metal ions like Cu (II), is thought to
be responsible for the impaired RBC morphology observed in subjects with AD. These RBC modifications found even after the
amyloids are removed resulting in impaired deformability and adherence of RBCs to the endothelium, both of which contribute
to cerebral hypo perfusion. The increased oxidative stress and vascular adhesion is also expected to result in the transfer or
reactive oxygen species to the vasculature which can trigger an inflammatory response. These studies suggest that although RBCs
do not accumulate a significant fraction of the amyloid generated during AD, the transient effects of the interaction of RBCs
with amyloids can contribute to cerebral amyloid angiopathy, cerebral hypo perfusion and inflammation that trigger neuronal
dysfunction and AD.
Biography
Joseph M. Rifkind completed his Ph.D. in Physical Chemistry from Columbia University in 1966. He has been at the National Institutes of Health
since 1968. Since 1985, he was the Chief of the Molecular Dynamics Section at the National Institute on Aging. He has published over 130 papers
in peer reviewed journals and over 20 book chapters. His research has been directed at the physiological role of oxidative stress and nitric oxide
metabolism primarily involving the red blood cell with 8 papers dealing with amyloids and Alzheimer?s disease.
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