• DOI:10.1124/jpet.110.173294
• Corpus ID: 32117433

Chronic Suppression of Phosphodiesterase 10A Alters Striatal Expression of Genes Responsible for Neurotransmitter Synthesis, Neurotransmission, and Signaling Pathways Implicated in Huntington's Disease

@article{Kleiman2011ChronicSO,
  title={Chronic Suppression of Phosphodiesterase 10A Alters Striatal Expression of Genes Responsible for Neurotransmitter Synthesis, Neurotransmission, and Signaling Pathways Implicated in Huntington's Disease},
  author={Robin J Kleiman and Lida H. Kimmel and Susan Bove and Thomas A. Lanz and John F. Harms and Alison Romegialli and Kenneth S Miller and A Willis and Shelley G Des Etages and Max Kuhn and Christopher J. Schmidt},
  journal={Journal of Pharmacology and Experimental Therapeutics},
  year={2011},
  volume={336},
  pages={64 - 76}
}

• R. Kleiman, L. Kimmel, +8 authors C. J. Schmidt
• Published 1 January 2011
• Biology
• Journal of Pharmacology and Experimental Therapeutics

Inhibition of phosphodiesterase 10A (PDE10A) promotes cyclic nucleotide signaling, increases striatal activation, and decreases behavioral activity. Enhanced cyclic nucleotide signaling is a well established route to producing changes in gene expression. We hypothesized that chronic suppression of PDE10A activity would have significant effects on gene expression in the striatum. A comparison of the expression profile of PDE10A knockout (KO) mice and wild-type mice after chronic PDE10A inhibition revealed altered expression of 19 overlapping genes with few significant changes outside the striatum or after administration of a PDE10A inhibitor to KO animals. Chronic inhibition of PDE10A produced up-regulation of mRNAs encoding genes that included prodynorphin, synaptotagmin10, phosphodiesterase 1C, glutamate decarboxylase 1, and diacylglycerol O-acyltransferase and a down-regulation of mRNAs encoding choline acetyltransferase and Kv1.6, suggesting long-term suppression of the PDE10A enzyme is consistent with altered striatal excitability and potential utility as a antipsychotic therapy. In addition, up-regulation of mRNAs encoding histone 3 (H3) and down-regulation of histone deacetylase 4, follistatin, and claspin mRNAs suggests activation of molecular cascades capable of neuroprotection. We used lentiviral delivery of cAMP response element (CRE)-luciferase reporter constructs into the striatum and live animal imaging of 2-{4-[-pyridin-4-yl-1-(2,2,2-trifluoro-ethyl)-1H-pyrazol-3-yl]-phenoxymethyl}-quinoline succinic acid (TP-10)-induced luciferase activity to further demonstrate PDE10 inhibition results in CRE-mediated transcription. Consistent with potential neuroprotective cascades, we also demonstrate phosphorylation of mitogen- and stress-activated kinase 1 and H3 in vivo after TP-10 treatment. The observed changes in signaling and gene expression are predicted to provide neuroprotective effects in models of Huntington's disease.