Study hypothesizes that adolescent steroid exposure may permanently alter the production of the feel good receptor
"With more than one in ten boys admitting to using steroids, muscle- and strength-enhancing drug use among teenagers has caused considerable concern among parents and researchers over the past decade, but until now, the longer-term physiological and neurological effects of its use on the developing brain have not been fully examined. Now, new research from Northeastern University, published in the latest issue of the journal Pharmacology, Biochemistry and Behavior, documents the link between adolescent anabolic steroid use and aggression and partly associates the increases in aggression with deficits in the brain"s serotonin system. The study will examine longer-term deficiencies of serotonin levels in the brain as a result of damage from steroid use, suggesting that a tendency toward aggression and impulsiveness may actually linger long after both the steroid use and the muscles and strength developed have waned.
With funding from the National Institute of Health, Northeastern University psychology professor Richard Melloni and graduate student Jill Grimes examined the phenomenon of long-term steroid use through a series of experiments on groups of adolescent male Syrian hamsters. During adolescence, this particular breed of hamster displays a natural form of territorial aggression, has similar neurological circuitry to human beings and similar aggression and dominance patterns during its adolescent years, making it a natural model for neurological and behavioral experiments.
Christine Phelan | EurekAlert!
Europe’s Demographic Future. Where the Regions Are Heading after a Decade of Crises
10.08.2017 | Berlin-Institut für Bevölkerung und Entwicklung
Scientists reveal source of human heartbeat in 3-D
07.08.2017 | University of Manchester
Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.
As graphene's popularity grows as an advanced "wonder" material, the speed and quality at which it can be manufactured will be paramount. With that in mind,...
Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.
Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...
For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.
While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...
An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.
The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...
A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.
Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...
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