The spontaneous neuronal activity of meso-accumbens dopaminergic neurons was
recorded in unanesthetized rats withdrawn from chronic morphine administration (15 days) …

The present study was carried out to evaluate the effect of morphine, cocaine and ethanol on
the density of opioid receptors in the nucleus accumbens and striatum of rat brain. The …

Repeated administration of morphine to rodents produces a subsequent augmentation of
the motor stimulant effects of this drug, a phenomenon termed behavioral sensitization …

Single unit recording and micropressure ejection techniques were used to investigate the
actions of opiates on dopaminergic and non-dopaminergic neurons in the rat substantia …

CHRONIC morphine has been shown to decrease levels of neurofilaments (NFs) in the
ventral tegmental area (VTA), which plays a critical role in the rewarding properties of …

Microdialysis and high-performance liquid chromatography with electrochemical detection
were used to determine extracellular levels of dopamine following ventral tegmental …

The effects of morphine sulfate and two benzodiazepine derivatives, chlordiazepoxide HCl
and diazepam, were evaluated upon single unit activity of the amygdaloid nuclear complex …

A considerable body of evidence indicates that opiates have an important influence on
midbrain dopaminergic neurons. However, little data exist concerning the effects of opiates …

Repeated, once daily morphine treatment (14 days) as well as chronic morphine
administration (6 days) caused a rebound reduction in the electrically evoked release of [3 …

The effect of local application of morphine (5 μg) into the ventral tegmental area (VTA) or
substantia nigra, pars compacta (SN c) on spontaneous activity was studied in the rat …