Principal Investigators

    KANG, UN JUNG

    Institution

    COLUMBIA UNIVERSITY HEALTH SCIENCES

    Contact information of lead PI

    Country

    USA

    Title of project or programme

    The role of striatal cholinergic interneurons in Parkinson’s disease

    Source of funding information

    NIH (NINDS)

    Total sum awarded (Euro)

    447946.789

    Start date of award

    01/12/2015

    Total duration of award in years

    1

    Keywords

    L-DOPA induced dyskinesia, cholinergic, Interneurons, Corpus striatum structure, Parkinson Disease

    Research Abstract

    ? DESCRIPTION (provided by applicant): Dopaminergic therapy in Parkinson’s disease (PD) is the most successful example of rationale treatment approach addressing neurotransmitter deficit in neurodegenerative disorders. However, it is limited by motor fluctuations including dyskinesia that develops over several years of treatment. It is not clear if disease progression or treatment is the major factor in producing L- DOPA-induced dyskinesia (LID), but clinical and experimental evidences point to contributions of age of onset, disease severity, and chronic dopaminergic drug exposure. We have recently reported that elevated cholinergic signaling may be a major contributor to LID. Repeated L- DOPA administration in parkinsonian mice produces LID, which is associated with hyperexcitability of striatal cholinergic interneuron (ChI) evidenced by extracellular signal- regulated kinase (ERK) activation and enhanced response of ChI to dopamine. Moreover, the expression of LID was partially attenuated by preventing ERK activation or a muscarinic receptor antagonist. Ablation of ChI dramatically reduces LID in a mouse model of PD created by 6-OHDA lesion. To define the role of ChI further, we will utilize a novel method of selectively activating or suppressing ChI by Designer Receptor Exclusively Activated by Designer Drug (DREADD) system using transgenic mice expressing Cre in ChI and adenovirus-mediated delivery of floxed construct of DREADD to the striatal ChI. We will determine the role of ChI in LID development and expression separately. We will characterize cellular mechanisms of ChI hyperactivity associated with LID. Finally, we will examine the effect of ChI on the excitability of the medium spiny neuron that is the major striatal output neuron.

    Further information available at:

Types: Investments < €500k
Member States: United States of America
Diseases: N/A
Years: 2016
Database Categories: N/A
Database Tags: N/A

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