Scientists have discovered the chemical that puts the sting into sunburn. So are the days of sunburn over?
Sun burn can cause lack of sleep, un-comfortableness when showering and itching when wearing clothes. However, bright red skin could soon be a thing of the past.
Scientists have pinpointed the chemical in sunburn which causes skin to itch hours after the sun has gone in. It is also though the finding could lead to drugs to treat long term illnesses such as arthritis.
For those sun lovers out there, it is important to recognise that exposure to sunshine is necessary for a healthy lifestyle, promoting production of Vitamin D, but too much sunshine can also be a bad thing!
The researchers, from King’s College London, began investigating the effects of UV rays on our skin, by using UV lamps to burn tiny areas of 10 volunteer’s arms. When the reddened skin was at its most sensitive, two days later, they removed slivers and ran experiments to find out why it was so painful. This experiment showed several chemicals to be present in the burnt skin at higher levels than usual. The main chemical found was CXCL5. The chemical attracts ‘inflammatory’ white blood cells to the sunburnt skin triggering pain and tenderness.
Further experiments with rats showed that it was also present in high levels in those that were sunburnt and when it was injected into those that had not been burnt, it made them highly sensitive to touch. The researchers used an antibody to block the action of CXCL5 to ease the pain of the sunburnt animals. This particular antibody is not suitable for use in people, but the research provides scientists with the foundations for medication. Either as a lotion oral pill, it could be used to soothe severe sunburn.
However, there are some negative points to the development, as it could encourage more people to stay longer in the sun, the scientists warn it would not protect people from cancer.
One of the scientists suggested the research may be relevant to other inflammatory conditions, such as arthritis. He quoted: ‘Most drugs taken to relieve pain are one of only two types – aspirin-like drugs and opioid drugs, such as codeine and morphine. Both of these have significant side-effects such as gastric bleeding, constipation and addictive properties that prevents their long-term use. These drugs also have limited efficacy. For both these reasons, there is a need for new analgesic drugs. I’m excited about where these findings could take us in terms of eventually developing a new type of analgesic for people who suffer from chronic pain.’
The study is also rather important because, the researchers used skin from humans straight away to find CXCL5 and then used rats to confirm the finding, rather than the other way around. Doing things this way round could significantly speed up the search for painkillers!