Few issues are as satisfying as scratching an itch - and now scientists have scratched probably the most nagging of all: why can we itch?

For the primary time, specialists at Harvard Medical School have recognized how a standard pores and skin bacterium makes us itch by appearing immediately on our nerve cells.

Researchers uncovered the pores and skin of mice to the staphylococcus aureus bacterium, and located they developed an intensifying itch over a number of days.

Not solely was this right down to the bacterium itself, however as a result of it made the rodents hypersensitive to mild touches that will usually not trigger an itch.

This response is frequent in sufferers with circumstances like eczema, however it may well additionally occur in individuals with none underlying circumstances - consider these itchy Christmas jumpers you will be carrying subsequent month.

Multiple modified variations of staphylococcus aureus had been engineered, some missing particular items of its typical molecular make-up, to establish a single bacterial enzyme chargeable for initiating an itch.

This enzyme, dubbed V8, triggers an itch by activating a protein referred to as PAR1. It's discovered on pores and skin neurons that carry varied indicators - like ache, warmth, and itch - to the mind.

Scratching the itch

When researchers repeated the experiments in lab dishes containing human neurons, in addition they responded to V8.

This was true no matter whether or not there have been cells implicated in pores and skin allergy symptoms or allergic reactions.

Study writer Liwen Deng stated: "We show these things can be decoupled. You don't necessarily have to have inflammation for the microbe to cause itch, but that the itch exacerbates inflammation on the skin."

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With PAR1 recognized because the chief explanation for an itch, researchers set about how one can block it.

Given it is a protein additionally concerned in blood-clotting, they tried an already authorised anti-clotting drug - and it labored.

Itchy mice skilled fast enchancment when handled, each when it comes to itches and any pores and skin harm.

Researchers imagine it might be used as an anti-itch treatment for people, turning into the premise of recent lotions.

Dr Deng stated: "Itch can be quite debilitating in patients who suffer from chronic skin conditions.

"Many of those sufferers stick with it their pores and skin the very microbe we have now proven for the primary time can induce itch."

Content Source: information.sky.com