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American Journal of Pathology, Vol 142, 1574-1585, Copyright © 1993 by American Society for Investigative Pathology

REGULAR ARTICLES

Lactotransferrin immunocytochemistry in Alzheimer and normal human brain

T Kawamata, I Tooyama, T Yamada, DG Walker and PL McGeer
Kinsmen Laboratory of Neurological Research, Department of Psychiatry, University of British Columbia, Vancouver, Canada.

Lactotransferrin (LF) expression was investigated immunocytochemically in postmortem brain tissues of normal controls and patients with Alzheimer's disease (AD). The antibody to LF stained some neurons weakly in young adult brains, but it stained many neurons as well as the glia of all types in elderly brains. LF expression was greatly up- regulated in both neurons and glia in affected AD tissue. It was very strongly associated with such extracellular pathological entities as diffuse and consolidated amyloid deposits and extracellular neurofibrillary tangles. In addition, it was identified in a minority of intracellular neurofibrillary tangles, neuropil threads, and degenerative neurites. LF is an iron scavenger and a complement inhibitor. Up-regulation may be a defense mechanism in AD-affected brain tissue.


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Copyright © 1993 by the American Society for Investigative Pathology.