Prenatal cannabis exposure linked to increased risk of opioid addiction later in life

With the increased legalization of recreational cannabis, as many as 1 in 5 pregnant women in the U.S. are now using the drug to help with morning sickness, lower back pain or anxiety. Evidence has been growing, however, to suggest that tetrahydrocannabinol (THC), the main psychoactive ingredient in cannabis, poses risks to the developing fetus by impacting brain development. Now a new study finds that this could increase the risk of addiction to opioids later in life.

This illustration shows that male animals exposed to THC in the womb experience a greater surge in the "reward-seeking" brain chemical dopamine when exposed to opioid drugs as adolescents compared to those that were never exposed to THC.

When THC-exposed animals reached early adulthood, they were more likely to show enhanced opioid-seeking and were more likely to relapse upon opioid-associated environmental cues compared to those animals who were not exposed to THC in the womb. They were also more likely to develop persistent addiction-like behaviors.

In a follow-up experiment, the researchers implanted tiny sensors in the animals' brains and measured heightened dopamine release, accompanied by activity in neurons that over-represented opioid-related cues, in the rats exhibiting strong addiction-like behaviors.

Source:

University of Maryland School of Medicine

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