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Cocaine addiction reversed in rats with publication compound

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Cocaine addiction is a major problem from the USA, together with deaths from the medication increasing by 42 per cent between 2001-2014. Now, https://lovecoca.eu.org/ may have discovered a solution to reverse this situation.

A new study - headed by researchers from The Scripps Research Institute (TSRI) in La Jolla, CA - explains targeting and blocking the experience of a brain enzyme called TrkB reduced cocaine-seeking behavior in mice, also paving the way to a potential remedy for cocaine dependence.



Cocaine - also referred to as"coke,""crack," or"blow" - is an illegal drug which derives from the leaves of their Erythroxylum coca bush, native to the Andean region of South America.

Cocaine a potent stimulant and very addictive. It activates the reward pathway in the brain - referred to since the mesocorticolimbic reward system - producing a feeling of pleasure and euphoria, making users crave of the medication.

As stated by the National Institute on Drug Abuse (NIDA), at 2014, approximately 913,000 people within the U.S. met the criteria for cocaine addiction, and of those almost 1.3 million emergency department visits for medication misuse in 2012, cocaine was included in more than 500,000.

At the moment, there are no medications to cure heroin dependence; behavioral interventions - such as contingency management, at which people with cocaine use disorders are exhibited using exemptions that are inspirational to stop using the drug - will be the primary form of treatment.

The new study from Contet and coworkers, nevertheless, suggests a pharmacological treatment for cocaine dependency could be in the cards.
Targeting TrkB to fight cocaine dependence

Previous research in rat models of cocaine dependency has demonstrated that repeated exposure to the drug contributes to long term changes in two significant regions of the mesocorticolimbic benefit system: the nucleus accumbens and the medial prefrontal cortex.

Scientists found such changes are partially triggered by alterations to the creation of brain-derived neurotrophic factor (BDNF) - a protein which triggers TrkB receptors - and injecting BDNF into the nucleus accumbens of rats increases cocaine-seeking behaviour.

On the flip side, studies have found that inhibiting BDNF creation or BDNF/TrkB signaling at the nucleus accumbens reduces signs of drug addiction in rats.


As such, scientists have looked to targeting and blocking TrkB for a means to combat addiction to cocaine and other drugs, but this has not been without its own challenges.

By way of example, Contet and colleagues remember that at the medial prefrontal cortex, BDNF reduces dependency behaviors - as revealed in rat studies. But, blocking BDNF/TrkB indicating inside this region increases such behaviors.

"Based on these previous findings, we were very excited to investigate whether blocking TrkB receptors throughout the brain would be beneficial or detrimental in aiding to reduce the motivation to carry cocaine," says study coauthor Michel M.M. Verheij, who was a research associate at TSRI whenever the analysis was conducted.
TrkB inhibitor reduced cocaine dependence on rats

For their analysis, the team tested the results of a newly developed compound identified as cyclotraxin-B - which could travel from the bloodstream to the brain to block TrkB receptors - to rats who had learned to press a lever so as to self-administer cocaine.

https://lovecoca.eu.org/shop/ led the rats to use less cocaine and press on the lever twice. What is more, the treated rats were less inclined to get started using the medication again after a period of withdrawal. All these factors represent a decrease in cocaine dependency.

Furthermore, the investigators found that cyclotraxin-B resulted in more ordinary TrkB signaling activity in the nucleus accumbens.

Interestingly, treatment with all the the TrkB inhibitor additionally led to signs of normal TrkB signaling activity in the medial prefrontal cortex.

"We suspect that the antagonist has its own main action from the nucleus accumbens, where it's logical that it might keep the regeneration that's triggered by cocaine," explains Contet,"while what goes on in the prefrontal cortex is probably a downstream outcome, rather than an immediate effect of this TrkB antagonist in this region."

One important observation, the team notesis the fact that cyclotraxin-B did not lower the rodents' desire for a yummy glucose solution. "That is good as it indicates that the TrkB antagonist doesn't work by inducing a general suppression of desire or activity, but specifically reduces the feeling of motivation and reward for cocaine," says Contet.

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