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Engineered Bacterial “Syringes” Can Deliver Drugs Into Human Cells

Researchers repurpose tiny bacterial injection systems to specifically inject a wide variety of proteins into human cells and living mice.

Written byRohini Subrahmanyam, PhD
| 4 min read
Image shows photorhabdus virulence cassettes (green) binding to insect cells (blue) prior to injection of payload proteins. 
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Sophisticated, effective drugs to treat diseases and other conditions aren’t any good if they can’t reach the part of the body or the specific cells that they’re designed to target. However, scientists have found a new way to deliver tiny proteins into specific cells, using small syringelike structures naturally found on certain bacteria. The study, published in Nature on March 29, could lead to better drug-delivery systems in medicine.

“Delivery remains a critical bottleneck in medicine,” said study coauthor and MIT researcher Joseph Kreitz. “Although many powerful new therapies have been developed over the past several decades, we will need a deep bench of options to get these therapies into the right cells in the body.”

In the study, Kreitz, Broad Institute researcher Feng Zhang, and the rest of their team took inspiration from nature, relying on tiny microbes that have found a way around this problem. Endosymbiotic bacteria, or ...

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Meet the Author

  • Rohini Subrahmanyam, PhD

    Rohini Subrahmanyam completed her PhD in Biology from the National Center for Biological Sciences in Bangalore, India. During PhD, she studied neuronal defects in a rat model of autism. For postdoctoral research at Harvard University, she used human embryonic stem cells to study cortex development using brain organoids. Now back in Bangalore, she likes writing about biology, from interesting, absurd creatures to important medical discoveries.

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