7 research outputs found
A novel DYRK1A (Dual specificity tyrosine phosphorylationâregulated kinase 1A) inhibitor for the treatment of Alzheimer's disease: effect on Tau and amyloid pathologies in vitro
International audienceThe dualâspecificity tyrosine phosphorylationâregulated kinase 1A (DYRK1A) gene is located within the Down Syndrome (DS) critical region on chromosome 21 and is implicated in the generation of Tau and amyloid pathologies that are associated with the early onset Alzheimer's Disease (AD) observed in DS. DYRK1A is also found associated with neurofibrillary tangles in sporadic AD and phosphorylates key AD players (Tau, amyloid precursor, protein, etc). Thus, DYRK1A may be an important therapeutic target to modify the course of Tau and amyloid beta (AÎČ) pathologies. Here, we describe EHT 5372 (methyl 9â(2,4âdichlorophenylamino) thiazolo[5,4âf]quinazolineâ2âcarbimidate), a novel, highly potent (IC50 = 0.22 nM) DYRK1A inhibitor with a high degree of selectivity over 339 kinases. Models in which inhibition of DYRK1A by siRNA reduced and DYRK1A overâexpression induced Tau phosphorylation or AÎČ production were used. EHT 5372 inhibits DYRK1Aâinduced Tau phosphorylation at multiple ADârelevant sites in biochemical and cellular assays. EHT 5372 also normalizes both AÎČâinduced Tau phosphorylation and DYRK1Aâstimulated AÎČ production. DYRK1A is thus as a key element of AÎČâmediated Tau hyperphosphorylation, which links Tau and amyloid pathologies. EHT 5372 and other compounds in its class warrant in vivo investigation as a novel, highâpotential therapy for AD and other Tau opathies