Conditional neural knockout of the adenosine A2A receptor and pharmacological A2A antagonism reduce pilocarpine-induced tremulous jaw movements: Studies with a mouse model of parkinsonian tremor

John D. Salamone*, Lyndsey E. Collins-Praino, Marta Pardo, Samantha J. Podurgiel, Younis Baqi, Christa E. Müller, Michael A. Schwarzschild, Mercè Correa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


Tremulous jaw movements are rapid vertical deflections of the lower jaw that resemble chewing but are not directed at any particular stimulus. In rats, tremulous jaw movements can be induced by a number of conditions that parallel those seen in human parkinsonism, including dopamine depletion, dopamine antagonism, and cholinomimetic drugs. Moreover, tremulous jaw movements in rats can be attenuated using antiparkinsonian agents such as L-DOPA, dopamine agonists, muscarinic antagonists, and adenosine A2A antagonists. In the present studies, a mouse model of tremulous jaw movements was established to investigate the effects of adenosine A2A antagonism, and a conditional neuronal knockout of adenosine A2A receptors, on cholinomimetic-induced tremulous jaw movements. The muscarinic agonist pilocarpine significantly induced tremulous jaw movements in a dose-dependent manner (0.25-1.0mg/kg IP). These movements occurred largely in the 3-7.5Hz local frequency range. Administration of the adenosine A2A antagonist MSX-3 (2.5-10.0mg/kg IP) significantly attenuated pilocarpine-induced tremulous jaw movements. Furthermore, adenosine A2A receptor knockout mice showed a significant reduction in pilocarpine-induced tremulous jaw movements compared to littermate controls. These results demonstrate the feasibility of using the tremulous jaw movement model in mice, and indicate that adenosine A2A receptor antagonism and deletion are capable of reducing cholinomimetic-induced tremulous jaw movements in mice. Future studies should investigate the effects of additional genetic manipulations using the mouse tremulous jaw movement model.

Original languageEnglish
Pages (from-to)972-977
Number of pages6
JournalEuropean Neuropsychopharmacology
Issue number8
Publication statusPublished - Aug 2013
Externally publishedYes


  • Acetylcholine
  • Motor
  • Muscarinic receptor
  • Parkinson's disease
  • Parkinsonism
  • Striatum

ASJC Scopus subject areas

  • Pharmacology
  • Neurology
  • Clinical Neurology
  • Psychiatry and Mental health
  • Biological Psychiatry
  • Pharmacology (medical)


Dive into the research topics of 'Conditional neural knockout of the adenosine A<sub>2A</sub> receptor and pharmacological A<sub>2A</sub> antagonism reduce pilocarpine-induced tremulous jaw movements: Studies with a mouse model of parkinsonian tremor'. Together they form a unique fingerprint.

Cite this