Phosphodiesterase 10A Is Tethered to a Synaptic Signaling Complex in Striatum.

The Journal of Biological Chemistry
Corina RusswurmMichael Russwurm

Abstract

Phosphodiesterase 10A (PDE10A) is a dual substrate PDE that can hydrolyze both cGMP and cAMP. In brain, PDE10A is almost exclusively expressed in the striatum. In several studies, PDE10A has been implicated in regulation of striatal output using either specific inhibitors or PDE10A knock-out mice and has been suggested as a promising target for novel antipsychotic drugs. In striatal medium spiny neurons, PDE10A is localized at the plasma membrane and in dendritic spines close to postsynaptic densities. In the present study, we identify PDE10A as the major cAMP PDE in mouse striatum and monitor PKA-dependent PDE10A phosphorylation. With recombinantly expressed PDE10A we demonstrate that phosphorylation does not alter PDE10A activity. In striatum, PDE10A was found to be associated with the A kinase anchoring protein AKAP150 suggesting the existence of a multiprotein signaling complex localizing PDE10A to a specific functional context at synaptic membranes. Furthermore, the cAMP effector PKA, the NMDA receptor subunits NR2A and -B, as well as PSD95, were tethered to the complex. In agreement, PDE10A was almost exclusively found in multiprotein complexes as indicated by migration in high molecular weight fractions in size exclusion...Continue Reading

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Citations

Apr 9, 2016·American Journal of Human Genetics·Niccolò E MencacciKailash P Bhatia
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