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American Journal of Pathology, Vol 144, 104-116, Copyright © 1994 by American Society for Investigative Pathology
REGULAR ARTICLES |
MM Verbeek, I Otte-Holler, JR Westphal, P Wesseling, DJ Ruiter and RM de Waal
Department of Pathology, University Hospital Nijmegen, The Netherlands.
The still unsolved pathogenesis of Alzheimer's disease (AD) has been the subject of extensive speculation. Some years ago, a local acute phase reaction involving production of interleukin-1 (IL-1) and IL-6 was proposed as the triggering event in AD. Since it has been reported that these cytokines induce expression of intercellular adhesion molecule-1 (ICAM-1), we analyzed AD brain tissue cryosections for the presence of ICAM-1 by immunostaining and for ICAM-2 expression as a control. In senile plaques a marked diffuse or granular staining for the ICAM-1 domains 1, 4, and 5 was observed, whereas ICAM-2 expression was observed in microglial cells. Immunoprecipitation analysis demonstrated the presence of a 85 kd ICAM-1 molecule in AD frontal cortex. Our findings indicate that ICAM-1 accumulates in senile plaques as a complete 5-domain molecule at a relatively early stage of senile plaque formation. Our results are in support of a cytokine-mediated pathogenesis of senile plaque formation.
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