There are millions of people who are allergic to nickle which causes itching, burning, and redness upon contact with skin. It's the reason why people have skin reactions when wearing cheap jewelry as well as cell phones.
The cause of such dermatitis was a mystery until recently when scientists in Germany have discovered the underlying mechanism of this reaction. Using mice, they figured out that nickel binds to a protein called toll-like receptor 4 or TLR4, which signals the immune system to initiate an inflammatory response.
Treatment of nickle allergy can be theoretically be made by creating a blocker to his protein.
Reference:
Crucial role for human Toll-like receptor 4 in the development of contact allergy to nickel. Nat Immunol. 2010 Aug 15. [Epub ahead of print]
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