“Research from Taiwan indicates that capnellene (GB9), a compound extracted from the soft coral Capnella imbricata, could prove useful for treating neuropathy and neuropathic pain.”

When pain is the result of a disruption or alteration of nerve conduction, it is termed neurogenic or neuropathic. Pain caused by nerve damage can range from a mild prickling to severe burning, itching or aching and usually requires different treatment from musculoskeletal pain.

Pain management is approached medically, behaviourally, physically and in some cases, surgically. If it is treated with drugs it is always a balance of risk versus benefit. In other words, medication side effects need to be considered and continually evaluated in terms of their impact on a person’s quality of life.

Neuropathic pain responds variably to currently available drugs; painkillers, antidepressants and anti-epilepsy drugs often have no effect.

Usual medications

Carbamazepine (anticonvulsant): Side effects Drowsiness, Dizziness, Coordination difficulties

Phenytoin (anticonvulsant): Side effects Dizziness, Nausea, Insomnia, Uncontrollable eye movements, Coordination difficulties, Slurred speech, Confusion

Baclofen (muscle relaxant): Side effects Weakness, Drowsiness, Dizziness

Gabapentin (anticonvulsant) may also help: Side effects Dizziness, Coordination difficulties, Fatigue

Zhi-Hong Wen. said “Capnellene could be the first of a new generation of painkillers that are more effective than steroids or opiates and do not have their potential side effects or their addiction-forming properties,”

CB09 and its derivative GB10 have been looked at with two proinflammatory molecules which were reduced to almost control levels at the highest GB9 and GB10 concentrations tested.

“We are currently investigating the effects of GB9 and GB10 in other animal models of osteoarthritic pain, multiple sclerosis and Parkinson disease, as the compounds could also be potent therapeutic agents for a range of neuroinflammatory diseases,” says Wen.

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The research centers on a compound known as NNK, which is common in tobacco. NNK is a procarinogen, a chemical substance which becomes carcinogenic when it is altered by the metabolic process of the body.

Unlike alcohol or drug abuse NNK does not appear to harm brain cells directly, however, the research team believe it may cause neuroinflamation, a condition which leads to disorders such as Multiple Sclerosis.

“Considering the extreme economical and disease burden of neuroinflammation related disorders, it is extremely important from a medical, social and economic point of view to discover if NNK in tobacco causes neuroinflammation” said Ghosh.

To prove if such a link exists the team conducted two types of tests, one outside of a living host in glass and one in laboratory mice. The team used blot analysis techniques which showed that the introduction of NNK resulted in a clear increase in proinflammatory signaling proteins, proinflammatory effector proteins and other stress related proteins. Increased levels of proinflammatory cytokines, which act as molecular messengers between cells, were also detected.

This shows that NNK provokes an exaggerated response from the brain’s immune cells, known as microglia. Microglia cells act as ‘destroyers’ for the brain by attacking damaged or unhealthy cells. However, when provoked by NNK these cells start to attack healthy brain cells rather than the unhealthy cells they are supposed to attack.

“Our findings prove that tobacco compound NNK can activate microglia significantly which subsequently harms the nerve cells,” said Basu.

While other harmful side effects of smoking, such as lung disease, usually derive from tar or smoke this research suggests damage is not confined only to smoking. NNK is present in all forms of tobacco and therefore it can also enter the body through chewing.

The study also suggests that second hand smoking may lead to the same neuroinflamation conditions. Concentrations of NNK in tobacco can vary from 20-310 nanograms in cigarettes. However, NNK is also present in the smoke itself, smoke-filled air indoors may contain up to 26 nanograms of NNK. This means that both direct and second-hand smoking can lead to substantial measures of NNK intake.

“This research sheds light on the processes that lead to nerve cell damage in those who smoke cigarettes or consume tobacco products on regular basis,” said Ghosh.

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