Differential expression of beta amyloid protein precursor (APP) and tau mRNA in the aged human brain: individual variability and correlation between APP-751 and four-repeat tau

J Neuropathol Exp Neurol. 1991 Sep;50(5):560-78. doi: 10.1097/00005072-199109000-00004.


We investigated the relationship between the differential expression of beta amyloid protein precursor (APP) and tau mRNA, and the extent of beta and tau deposition in three regions from each of the 38 aged brains obtained from consecutive autopsied cases. Remarkable variabilities were noted in the ratios of APP-770/-751/-695 and four-repeat tau among elderly individuals. There was no consistent alteration in the APP differential expression among beta plaque (-), (+), and (++(-) ) groups. Also, no differences in the four-repeat tau ratios were noted among tangle (-), (+), and (++) groups. Despite these great individual variabilities, APP-751 was found to be well-correlated with four-repeat tau. It is possible that APP-751 and four-repeat tau are increasing during aging, while APP-695 and three-repeat tau are decreasing.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged
  • Aged, 80 and over
  • Aging / metabolism*
  • Alzheimer Disease / metabolism
  • Alzheimer Disease / pathology
  • Amyloid beta-Peptides / genetics*
  • Amyloid beta-Protein Precursor
  • Brain / metabolism*
  • Brain / pathology
  • Female
  • Humans
  • Immunohistochemistry
  • Isomerism
  • Male
  • Microtubule-Associated Proteins / genetics*
  • Protein Precursors / genetics*
  • RNA, Messenger / metabolism*
  • Repetitive Sequences, Nucleic Acid
  • tau Proteins


  • Amyloid beta-Peptides
  • Amyloid beta-Protein Precursor
  • Microtubule-Associated Proteins
  • Protein Precursors
  • RNA, Messenger
  • tau Proteins