A team led by researchers at the University of California, San Francisco, has identified the molecular mechanism by which the protein Piezo1 detects mechanical forces and converts them into electrical signals.
Piezo1 is found in the cell membranes of sensory neurons, which are responsible for detecting touch, pressure, and pain. When these neurons are stimulated, Piezo1 opens up, allowing ions to flow into the cell and generating an electrical signal that is sent to the brain.
The researchers used a combination of techniques, including X-ray crystallography and electrophysiology, to determine the structure of Piezo1 and how it changes when it is activated. They found that Piezo1 has a unique blade-like structure that acts like a lever arm. When force is applied to the blade, it pries open the channel, allowing ions to flow through.
The discovery could lead to new treatments for conditions such as chronic pain, anxiety disorders, and neuropathic pain, which are caused by damage to sensory neurons. By targeting Piezo1, researchers may be able to develop drugs that either block or enhance its activity, depending on the desired effect.
The findings, published in the journal Nature, also shed light on the basic mechanisms by which cells sense their environment. Piezo1 is just one of a family of proteins that are involved in mechanosensation, and the researchers believe that their findings could provide insights into how these other proteins work as well.
"Our study provides a detailed understanding of how Piezo1 senses mechanical forces at the molecular level," said senior author Yifan Cheng, PhD, an associate professor of biochemistry and biophysics at UCSF. "This knowledge could lead to the development of new therapies for a variety of conditions that affect touch and pain sensation."
