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Antibodies from the desert as guides to diseased cells
Date:6/12/2014

odifying the surface of the nanoparticle, it also gets more difficult for the immune system to recognize the foreign material, which allows the nanoparticles to actually reach their target.

The ultra-small particles should then detect the so-called epidermal growth factor receptor (EGFR) in the human body. In various types of tumours, this molecule is overexpressed and/or exists in a mutated form, which allows the cells to grow and multiply uncontrollably. The Dresden researchers could demonstrate in experiments that nanoparticles that have been combined with the camel antibody fragments can more firmly bind to the cancer cells. "The EGFR is a virtual lock to which our antibody fits like a key," explains Zarschler.

They even obtained the same results in experiments involving human blood serum a biologically relevant environment the scientists point out: "This means that we carried out the tests under conditions that are very similar to the reality of the human body," explains Dr. Holger Stephan, who leads the project. "The problem with many current studies is that artificial conditions are chosen where no disruptive factors exist. While this provides good results, it is ultimately useless because the nanoparticles fail finally in experiments conducted under more complex conditions. In our case, we could at least reduce this error source."

However, more time is required before the nanoparticles can be utilized in diagnosing human tumours. "The successful tests have brought us one step further," explains Stephan. "The road, however, to its clinical use is long." The next aim is to reduce the size of the nanoparticles, which are now approximately fifty nanometres in diameter, to less than ten nanometres. "That would be optimal," according to Zarschler. "Then they would only remain in the human body for a short period just long enough to detect the tumour."
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Contact: Simon Schmitt
s.schmitt@hzdr.de
49-351-260-3400
Helmholtz-Zentrum Dresden-Rossendorf
Source:Eurekalert

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