Summary: Researchers report synthetic marijuana products, sold under names such as K2 or Spice, have serious side effects including psychosis, seizures and even death. Researchers warn they are not a safe substitute for cannabis.
Source: Cell Press.
Synthetic marijuana compounds are marketed as safe, legal alternatives to marijuana that cannot be detected by standard drug testing, but these substances differ chemically from marijuana; are linked to dangerous side effects, including seizures, psychosis, dependence, and death; and are not safe substitutes, say University of Arkansas for Medical Sciences (UAMS) scientists in a Review published February 2 in Trends in Pharmacological Sciences.
Researchers discovered several decades ago that the primary psychoactive compound in marijuana, Δ9-THC, activates two receptors, CB1, found in high abundance in the brain and central nervous system, and CB2, found primarily in the immune system. To study these receptors, researchers identified other naturally occurring chemicals and developed synthetic cannabinoid (SCB) compounds that also bind to them; collectively, these compounds are known as cannabinoids. Although they activate the CB1 and CB2 receptors, SCBs and other cannabinoids are otherwise chemically distinct from marijuana and often from each other.
SCBs are now marketed and sold as synthetic marijuana under names such as “K2” and “Spice.” “It started in the early 2000s in Europe, and in the U.S., in 2007 or so, we started seeing all kinds of people coming into emergency rooms saying they smoked marijuana, but then they had these really bizarre symptoms that did not correspond with the effects you see with marijuana,” says Paul L. Prather, a cellular and molecular pharmacologist at UAMS.
SCBs are often sold as safe alternatives to marijuana that, because of their chemical structures, will not be discovered through standard drug screenings. This feature makes them popular among groups who want to elude detection, such as adolescents and military personnel. SCBs are also more potent than Δ9-THC; “these are highly efficacious drugs; they tend to activate the CB1 receptor to a greater degree than we can ever get to with THC from marijuana,” says William E. Fantegrossi, a behavioral pharmacologist at UAMS. As a result, some users turn to them to achieve a more intense high.
A range of both acute and long-term adverse effects of SCB use are reported in clinical case studies, including seizures and convulsions, kidney injury, cardiotoxicity, strokes, anxiety, and psychosis in susceptible individuals, as well as tolerance, withdrawal, and dependence. Twenty deaths have also been linked to SCB use.
Prather and his co-authors note that in addition to the efficacy of SCBs in activating the CB1 receptors, they pose other health risks. Since they are chemically distinct from Δ9-THC, there is a chance that they may be activating other cellular receptors in addition to CB1 and that these receptors could be responsible for some of the adverse health effects seen in SCB users.
Another risk is that users purchasing these drugs over the internet or elsewhere simply do not know what they are getting in each purchase. “Not only does the amount of the active pharmacological agent change with different batches of drugs, made by different labs, but the active compound itself can change,”says Fantegrossi. “And there are usually a minimum of three, if not five, different synthetic cannabinoids in a single product,” adds Prather.
The authors caution against dismissing the therapeutic potential of cannabinoids entirely, noting that just as with opioids, improper use or abuse can lead to adverse effects or death, but proper use can provide significant benefits. But Prather cautions that “the public sees anything with the marijuana label as potentially safe, but these synthetic compounds are not marijuana, … you never know what they are, and they are not safe.”
Source: Trina Arpin – Cell Press
Image Source: NeuroscienceNews.com image is in the public domain.
Original Research: Full open access research for “Synthetic Pot: Not Your Grandfather’s Marijuana” by Benjamin M. Ford, Sherrica Tai, William E. Fantegrossi, and Paul L. Prather in Trends in Pharmacological Sciences. Published online February 2 2017 doi:10.1016/j.tips.2016.12.003
Synthetic Pot: Not Your Grandfather’s Marijuana
In the early 2000s in Europe and shortly thereafter in the USA, it was reported that ‘legal’ forms of marijuana were being sold under the name K2 and/or Spice. Active ingredients in K2/Spice products were determined to be synthetic cannabinoids (SCBs), producing psychotropic actions via CB1 cannabinoid receptors, similar to those of Δ9-tetrahydrocannabinol (Δ9-THC), the primary active constituent in marijuana. Often abused by adolescents and military personnel to elude detection in drug tests due to their lack of structural similarity to Δ9-THC, SCBs are falsely marketed as safe marijuana substitutes. Instead, SCBs are a highly structural diverse group of compounds, easily synthesized, which produce very dangerous adverse effects occurring by, as of yet, unknown mechanisms. Therefore, available evidence indicates that K2/Spice products are clearly not safe marijuana alternatives.
SCBs are a large collection of man-made chemicals, reported in the scientific literature over decades of research to have affinity for CB1 and CB2 cannabinoid receptors.
Products known as K2 or Spice contain a mixture of SCBs that have been illicitly synthesized and sprayed onto inert plant material, to mimic the appearance and psychotropic effects of Δ9-THC in marijuana.
K2/Spice products are falsely marketed to adolescent and other vulnerable populations as ‘safe’ and/or ‘legal’ alternatives to marijuana, and are widely known to avoid detection in standard drug screens due to their lack of structural similarity to Δ9-THC.
SCBs present in K2/Spice products produce a variety of dangerous acute and chronic adverse effects, including psychosis, seizures, tolerance, dependence, and death, with a greater severity and frequency than observed following marijuana use.
Very little is known about the mechanisms underlying the distinct toxic effects of SCBs compared to Δ9-THC, but it is likely that they result from actions at both CB1 and non-CB1 cannabinoid receptor targets.
“Synthetic Pot: Not Your Grandfather’s Marijuana” by Benjamin M. Ford, Sherrica Tai, William E. Fantegrossi, and Paul L. Prather in Trends in Pharmacological Sciences. Published online February 2 2017 doi:10.1016/j.tips.2016.12.003