The protein tyrosine kinase, fyn, in Alzheimer's disease pathology

Neuroreport. 1993 Apr;4(4):435-7. doi: 10.1097/00001756-199304000-00024.


Immunohistochemistry was used to assess the distribution of protein tyrosine kinases in Alzheimer's disease (AD) pathology. One of these, fyn, exhibited an interesting pattern of immunoreactivity. Low levels of immunoreactivity were apparent in neurons from both normal and AD brain. However a subset of neurons in AD brain exhibited intense fyn immunoreactivity. Double label immunohistochemistry revealed that fyn-positive neurons were also positive for abnormally phosphorylated microtubule-associated protein, tau. Proline-directed kinases, whose activity is regulated by phosphorylation on tyrosine, may be responsible for abnormal tau phosphorylation. These results identify fyn as a candidate kinase for regulating putative proline-directed kinases involved in abnormal tau phosphorylation.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Alzheimer Disease / enzymology*
  • Calcium-Calmodulin-Dependent Protein Kinases
  • Humans
  • Protein Kinases / metabolism*
  • Protein-Tyrosine Kinases / analysis*
  • Proto-Oncogene Proteins / analysis*
  • Proto-Oncogene Proteins c-fyn


  • Proto-Oncogene Proteins
  • Protein Kinases
  • Protein-Tyrosine Kinases
  • FYN protein, human
  • Proto-Oncogene Proteins c-fyn
  • Calcium-Calmodulin-Dependent Protein Kinases