Agents that reduce the level of a tau gene product in a cell, e.g., in a neuron, include antisense nucleic acids. For example, antisense nucleic acids can be used to down-regulate expression of a tau gene in a cell (e.g., in a neuron). The antisense sequence is complementary to the mRNA of the targeted gene (e.g., tau), and inhibits expression of the targeted gene products. Suitable oligonucleotides can be chemically modified from the native phosphodiester structure, in order to increase their intracellular stability and binding affinity. A number of such modifications have been described in the literature, which modifications alter the chemistry of the backbone, sugars, or heterocyclic bases.
