British researchers who built a multi-layer "barrier" of human cells to replicate the function of specialized protective tissues in the body found that signals transmitted by nanoparticles through the protective barrier indirectly damage DNA inside cells. The study results "expand significantly the hurdles that any theoretical nano-safety assessment would need to clear," an expert said. The discovered mechanism, however, also opens up the possibility of being able to deliver treatments across barriers without actually crossing them, another expert suggested.

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