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Journal of Brain Sciences

March 2015, Volume 1, 1, pp 24-42

Locus Coeruleus Neuronal and Behavioral Activity Following Acute and Chronic Methylphenidate

Bin Tang, Nachum Dafny

Bin Tang 1 Nachum Dafny 1 

  1. Dept. of Neurobiology and Anatomy University of Texas Medical School at Houston, USA 1

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Pages: 24-42

DOI: 10.18488/journal.83/2015.1.1/83.1.24.42

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Abstract:

Methylphenidate (MPD) is one of the choices to treat attention-deficit / hyperactivity disorder (ADHD), and its mechanism of action is not clear. Concomitant behavioral and locus coeruleus (LC) neuronal activity were recorded following acute and chronic (0.6, 2.5 and 10 mg/kg) MPD in freely moving rats. The experiment last for 10 days. (1) The behavioral recording showed that acute MPD increases in locomotor activity in a dose dependent manner.  (2) The same dose of chronic MPD administration elicits in some animals behavioral sensitization and in others behavioral tolerance. (3) The majority of the LC unit responded to acute MPD exposure by increase their firing rate. (4) The baseline activity on experimental day 10 (ED 10) after six daily repetitive MPD exposure was modulated in most of the LC units. (5) More than 90% of the LC unit respond to chronic MPD exposure and the majority of them by decrease their firing rate compared to the initial MPD effect. (6) The neuronal response to acute and chronic MPD recorded from animals expressing behavioral sensitization was significant difference from the LC units recorded from animals that expressed behavioral tolerance. Results indicated that the LC neuronal activities may contribute to the expression of behavioral sensitization and tolerance induced by chronic MPD administration and suggested that it is essential to record the animalís behavioral responses concomitantly with the LC neuronal activity events.
Contribution/ Originality
This paper is the first study which reported the acute and chronic dose response property of MPD on LC neuronal activity recorded concomitant with animal behavior. The study show neuronal activity recorded from behavioral sensitized animal response to MPD differently compare to those LC units recorded from behavioral tolerance animals. 

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