Listening to cancer cells for drug discovery
BioPhotonics staff
Researchers are making strides in the field of drug discovery, thanks
to holography and lasers. They are now able to detect motion inside three-dimensional
tumor spheroids that could show how various drug candidates affect intracellular
structures.
Researchers at Purdue University have developed holographic tissue
dynamics spectroscopy, a technique to measure the living motion inside a cell and
to determine the cell’s response to applied drugs. The technology was highlighted
in a letter in the
Journal of Biomedical Optics.
The spectrogram shows how cells react to drugs; for instance, when they interact with a metabolic
drug (iodo-acetate) in comparison to an antimitosis drug (cytochalasin). Courtesy
of David D. Nolte, Purdue University.
The scientists were able to view a tumor’s tissues in three
dimensions using holography. Using the holographic technique with lasers allows
them to see the tumor’s interior as well as its surface. Like polarized sunglasses,
the approach cancels the effect of any light scattered by skin and tissues, uncovering
the image-bearing light that is already there. Images similar to voiceprints used
in voice recognition security software are left that can show changes taking place
within the cells.
Upon completion of the hologram, the researchers use fluctuation
spectroscopy to measure time-dependent changes within the hologram. They measure
the frequency of light fluctuations as a function of time after a drug has been
administered. The resulting spectrogram represents a voiceprint of the drug used
on the cells, enabling drug researchers and manufacturers to see how various drug
candidates affect organlike structures within a cell.
With its high throughput, the technology will soon allow manufacturers
to more quickly determine which drugs are most effective in battling tumors and
other tissue diseases.
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