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Reversing the negative effects of adolescent marijuana use

Researchers at Western University have found a way to use pharmaceuticals to reverse the negative psychiatric effects of THC, the psychoactive chemical found in marijuana. Chronic adolescent marijuana use has previously been linked to the development of psychiatric diseases, such as schizophrenia, in adulthood. But until now, researchers were unsure of what exactly was happening in the brain to cause this to occur.

“What is important about this study is that not only have we identified a specific mechanism in the prefrontal cortex for some of the mental health risks associated with adolescent marijuana use, but we have also identified a mechanism to reverse those risks,” said Steven Laviolette, professor at Western’s Schulich School of Medicine & Dentistry.

In a study published online today in Scientific Reports the researchers demonstrate that adolescent THC exposure modulates the activity of a neurotransmitter called GABA in the prefrontal cortex region of the brain. The team, led by Laviolette and post-doctoral fellow Justine Renard, looked specifically at GABA because of its previously shown clinical association with schizophrenia.

“GABA is an inhibitory neurotransmitter and plays a crucial role in regulating the excitatory activity in the frontal cortex, so if you have less GABA, your neuronal systems become hyperactive leading to behavioural changes consistent with schizophrenia,” said Renard.

The study showed that the reduction of GABA as a result of THC exposure in adolescence caused the neurons in adulthood to not only be hyperactive in this part of the brain, but also to be out of synch with each other, demonstrated by abnormal oscillations called ‘gamma’ waves. This loss of GABA in the cortex caused a corresponding hyperactive state in the brain’s dopamine system, which is commonly observed in schizophrenia.

By using drugs to activate GABA in a rat model of schizophrenia, the team was able to reverse the neuronal and behavioural effects of the THC and eliminate the schizophrenia-like symptoms.

Laviolette says this finding is especially important given the impending legalization of marijuana in Canada. “What this could mean is that if you are going to be using marijuana, in a recreational or medicinal way, you can potentially combine it with compounds that boost GABA to block the negative effects of THC.”

The research team says the next steps will examine how combinations of cannabinoid chemicals with compounds that can boost the brains GABA system may serve as more effective and safer treatments for a variety of mental health disorders, such as addiction, depression and anxiety.

Researchers have identified a specific mechanism in the prefrontal cortex for some of the negative mental health risks associated with adolescent marijuana use. By demonstrating that adolescent THC exposure modulates the activity of a neurotransmitter called GABA in the prefrontal cortex region of the brain, they were also able to identify a mechanism to reverse those risks.

Have Canadian researchers found a way to reverse pot’s harmful effects?

Western University researchers might have found a way to reverse the negative effects of the psycho-active ingredient in marijuana on the adolescent brain.

Chronic cannabis use during adolescence has been linked to the development of psychiatric disorders such as anxiety, depression and schizophrenia later in adulthood.

But, according to a new study published in Nature’s Scientific Reports journal on Tuesday, there might be a way to reverse this.

The study exposed adolescent rats to high levels of tetrahydrocannabinol (THC), once they reached adulthood the researchers studied the rats’ prefrontal cortex.

The researchers found that THC exposure reduced a chemical in the brain called GABA, which regulates hyperactivity in the brain and has been associated with schizophrenia.

“We found a series of molecular changes in the prefrontal cortex that were very comparable to what we observe in the brains of people who have disorders like schizophrenia,” lead researcher Steve Laviolette told CTV London.

Laviolette and his team then used drugs to increase the amount of GABA in the rats’ brains. According to the study, this reversed chemical and behavioural effects of the THC and eliminated schizophrenia-like symptoms.

“We were able to pharmacologically restore the GABA system in the prefrontal cortex and remarkably what we saw was that it actually reversed all these behaviour deficits associated with this THC exposure,” said Laviolette.

More research is still needed to determine if boosting GABA has the same result in humans, but for those who have mental health problems Laviolette says there’s new hope.

“I think this is a really promising lead in terms of the potential of developing much safer versions of cannabinoid type drugs,” he said.

Laviolette added that these findings are especially important given the impending legalization of marijuana in Canada.

“What this could mean is that if you are going to be using marijuana, in a recreational or medicinal way, you can potentially combine it with compounds that boost GABA to block the negative effects of THC,” he said in a statement.

Laviolette and his team are now looking towards finding more effective and safer treatments for mental health disorders, such as addiction, depression and anxiety.

With files from CTV London’s Celine Moreau

Western University researchers might have found a way to reverse the negative effects of the psycho-active ingredient in marijuana on the adolescent brain. ]]>