Recent dispute over the legality of marijuana use and its health impacts sheds light on the controversial nature of the issue. While some proponents of marijuana emphasize its medicinal benefits, others are in favor of using the plant for recreational purposes. In our previous class discussion, we briefly touched upon the link between marijuana use and schizophrenia, which is why I became interested in learning more about cannabis and its effects on the brain.

Firstly, before I jump into a discussion of cannabis, let’s talk about some human anatomy. The human body is comprised of cannabinoid receptors scattered in the brain and throughout the body, which was discovered in the 1980s. Cannabinoid receptors can be classified in two ways: CB1 receptors and CB2 receptors, found in the brain and body, respectively. CB1 receptors are found primarily in the basal ganglia and limbic system (think hippocampus!), while CB2 receptors mainly reside in the immune system. These cannabinoid receptors are activated by a neurotransmitter called anandamide, which naturally occurs within the body. So what happens when cannabis, an exogenous cannabinoid, is introduced into the body’s system?

The THC in marijuana binds with our body’s cannabinoid receptors to exert its effects.  Because the hippocampus has high concentrations of cannabinoid receptors, when THC binds with these receptors, it interferes with our working memory. This was of particular interest to me when considering what we know about schizophrenia; however, it is important to note that cannabis has effects on a number of different bodily functions, some of which are believed to be therapeutic.

In a study that explored the effects of marijuana use, it was reported that teens who smoked marijuana daily for about three years had abnormal changes in their brain structures related to working memory and performed poorly on memory tasks (PsychToday.com). Not only does this serve to solidify our understanding of the hippocampus’s  function, but it also makes the link between schizophrenia and cannabis clearer. Patients with schizophrenia display hippocampal volume reduction and memory deficits, and the effects of cannabis use have been found to be similar to some of the effects of schizophrenia, as noted above.

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Dr. Christina Sanchez is a molecular biologist at Compultense University in Madrid Spain, her research led to the findings that THC does indeed kill cancer cells! She sat down with us to explain her work...

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