These findings suggest that (1) LB pathology can influence the clinical features of familial AD, (2) the E184D mutation of presenilin-1 may be associated with the LB formation through Abeta overproduction, although the process of LB formation is strongly affected by other unknown mechanisms, (3) in neurodegenerative disorders with LBs, there is a common pathophysiological background inducing NAC accumulation in neuritic plaques and astrocytes, and (4) the NAC accumulation in neuritic plaques is modulated by the abnormally aggregated tau protein.
Immunostaining showed that Abeta42 was predominant over Abeta40 in neuritic plaques in both patients, whereas Abeta40 was found to be predominant over Abeta42 in cerebral amyloid angiopathy in the patient with E184D.