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Human Cells Naturally 'Eat' Silicon Nanowires (ieee.org)
the_newsbeagle writes: By showing that human cells naturally engulf minuscule silicon nanowires, a material scientist from the University of Chicago has opened the way to intracellular electronics. Applications could include very specialized drug delivery, electrically stimulating the organelles inside the cell, or recording the signals that pass between those internal structures. From IEEE Spectrum: "Using both an electron microscope and a specialized optical imaging tool designed by the team, the group recorded the eating of the nanowires in detail. It appears that the cell's outer membrane folds itself like a pocket, grabs the nanowire, and envelops it in a membrane-lined bubble. The process is called phagocytosis; it's the same method used by immune cells to grab a bit of bacteria and swallow it up. Once the nanowire is inside, the cell's machinery then shuttles it through its system with sudden bursts of speed -- up to 99.4 nanometers per second -- and deposits it just outside the cell's nucleus. Tian's group made a video of the process (complete with melodramatic accompaniment)."
How do you intend to use this to fight cancer? Yes, you might be able to use it as a delivery mechanism, but there's no easy way to differentiate cancer cells from regular cells. Nothing here jumps out as doing something different that's relevant. Most things we use on cancer (radiation, and chemo) work by differentiating between regular cells and cancer cells, generally using the fact that cancer cells are always reproducing. No aspect of this process has anything to do with cell reproduction.
One of your premises is wrong. Radiation therapy works because it kills more cancer cells than normal cells. due to the self-repair process being inhibited for cancer cells, likely because they spend the energy on reproducing. But we don't need to know which ones are which. We bathe the general area in radiation, which causes DNA damage, which the healthy cells repair much more than cancer cells do.
Any other treatment that could produce genetic damage to cells can similarly be used, with the dosage controlled to damage healthy cells no more than can be repaired.
Would this open for such a treatment? Possibly - possibly not. But it should not be dismissed summarily without further investigation.