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Abstract
Extracellular single-unit recording techniques were used to evaluate the physiological and pharmacological characteristics of noradrenergic locus coeruleus (LC) neurons in urethane-anesthetized Maudsley reactive (MR) and non-reactive (MNRA) rat strains, a presumed genetic model for differences in ‘anxiety’. LC neurons from MNRA rats were found to have a significantly higher basal discharge rate than LC neurons from either the MR or Sprague-Dawley (SD) rats. The discharge pattern of MNRA LC neurons also differed significantly from that of LC neurons from SD and MR rats, with LC neurons from MNRA rats exhibiting a burst-like pattern of discharge. Finally, MNRA LC neurons were significantly less sensitive to the inhibitory effects of i.v. clonidine on spontaneous activity.
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