The impact of chronic nandrolone decanoate administration on the NK1 receptor density in rat brain as determined by autoradiography.

Adult male Sprague-Dawley rats were treated with the anabolic androgenic steroid nandrolone decanoate (15 mg/kg day) or oil vehicle (sterile arachidis oleum) during 14 days. The effect on the densities of the neurokinin NK1 receptor in brain was examined with autoradiography. An overall tendency of attenuation of NK1 receptor density was observed after completed treatment with nandrolone decanoate.

Amphetamine-induced aggression is enhanced in rats pre-treated with the anabolic androgenic steroid nandrolone decanoate.

Aggression is one of the most commonly reported psychiatric side effects among anabolic-androgenic steroids (AAS) users. Furthermore, anecdotal stories say the aggression is even more profound when a current, or former, AAS-user consumes other drugs of abuse such as amphetamine and alcohol. In the present study, we examined the effect of amphetamine on defensive reactivity and defensive aggression in Sprague-Dawley rats after chronic AAS treatment (daily intramuscular [i.

The substance P (SP) heptapeptide fragment SP1-7 alters the density of dopamine receptors in rat brain mesocorticolimbic structures during morphine withdrawal.

The aminoterminal fragment of substance P (SP), SP(1-7), has been suggested to modulate the expression of opiate tolerance and withdrawal behaviors in rodents. However, the mechanism of this effect is not yet clarified. Using a rat model we have previously demonstrated that SP(1-7) affects dopamine transmission and the expression of the dopamine D2-receptor gene transcript in the nucleus accumbens during naloxone precipitated morphine withdrawal.

Increased dopamine transporter density in the male rat brain following chronic nandrolone decanoate administration.

Adolescent males currently employ anabolic-androgenic steroids (AAS) to become intoxicated, besides the traditional desires of an improved physical appearance and enhanced sports performance. Several studies indicate that AAS affect the brain reward system. Recently chronic administration with nandrolone decanoate to male rats has been shown to increase the dopamine transporter (DAT) density in the striatum visualised in vivo by positron emission tomography.

Anabolic androgenic steroid nandrolone decanoate reduces hypothalamic proopiomelanocortin mRNA levels.

Supratherapeutical doses of anabolic androgenic steroids (AASs) have dramatic effects on metabolism in humans, and also inhibit feeding and reduce the rate of body weight gain in rats. In order to test the hypothesis that the AAS metabolic syndrome is accompanied by alterations in the central melanocortin system, we evaluated body weight, food intake and hypothalamic agouti-related protein (AgRP) and proopiomelanocortin (POMC) mRNA levels following administration of different doses of the anabolic androgenic steroid nandrolone decanoate. In order to distinguish changes induced by the steroid treatment per se from those resulting from the reduced food intake and growth rate, we also compared the effect of nandrolone decanoate on AgRP and POMC mRNA expression with both normally fed, and food restricted control groups.