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Rebeck, G.W. et al.

Multiple, diverse senile plaque-associated proteins are ligands of an apolipoprotein E receptor, the alpha 2-macroglobulin receptor/low-density-lipoprotein receptor-related protein.

Both apolipoprotein E and its receptor, the low-density-lipoprotein receptor-related protein (LRP), are associated with senile plaques in Alzheimer's disease. We examined the relationship of other LRP-related molecules to senile plaques. LRP is a multifunctional receptor that binds and rapidly internalizes at least seven ligands: apolipoprotein E, activated alpha 2-macroglobulin, tissue and urokinase-type plasminogen activators, plasminogen activator inhibitor-1, lipoprotein lipase, and lactoferrin. Using immunohistochemistry, we showed that all of these ligands, representing a diverse group of otherwise apparently unrelated proteins, accumulate on senile plaques. We also studied expression of the receptor-associated protein, a physiological inhibitor of LRP, in the hippocampal formation from normal subjects and Alzheimer's disease patients. Receptor-associated protein colocalizes with LRP on neuronal soma, but not on neuronal processes or reactive astrocytes. It is not present on senile plaques. These results suggest that senile plaque-associated LRP can bind its ligands, but clearance of these compounds may be impaired in the vicinity of senile plaques.[1]

References

Multiple, diverse senile plaque-associated proteins are ligands of an apolipoprotein E receptor, the alpha 2-macroglobulin receptor/low-density-lipoprotein receptor-related protein. Rebeck, G.W., Harr, S.D., Strickland, D.K., Hyman, B.T. Ann. Neurol. (1995) [Pubmed]

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