Abstract: The present invention relates to the use of modulators of the kinase activity of Mnk1 and/or Mnk2 the diagnosis, alleviation, treatment and/or prevention of a tauopathy. Particularly, the present invention relates to the use of a modulator of Mnk1 and/or Mnk2 kinase for the diagnosis, alleviation, treatment and/or prevention of Alzheimer's disease. Preferably, the compounds are condensed pyrimidines.