The surprising role of a key pressure-sensing protein in gut health
By Nadine A Yehya
Study finds Piezo1 protein helps regulate movement of food through intestines
(SACRAMENTO)
A groundbreaking study has revealed that a pressure-sensing protein known as Piezo1 plays a critical role in supporting gut health. The study’s findings may unlock new routes for understanding and treating complex gut disorders.
The protein acts like an internal sensor in the gut’s smooth muscle cells. It helps the intestines know when and how to move food through the digestive system.
The gut is mechanically very active. Its digestive tract constantly contracts and relaxes. The rhythmic contraction of smooth muscle cells helps break down food and absorb nutrients. Disruptions to this process lead to a range of gut motility disorders.
But how do muscle cells in the gut know when to contract?
That is the question UC Davis and UCLA researchers set out to answer through a series of tests in mouse models. They focused their study on Piezo1. Their work was published in Communications Biology.
Protein sensing, signaling and regulating muscle cells in the gut
Piezo1 is known for detecting physical forces, such as stretch and pressure. When the researchers genetically removed Piezo1 from intestinal smooth muscle cells, the effects were dramatic: weight loss, delayed food transit and thinning of the intestinal muscle layers. They also detected significant disruption to the calcium signaling essential for proper muscular contraction.
“The results were striking. Despite the profound changes in their gut motility, these mice continued to live as long as other normal mice. This highlights the truly complex nature of the gut,” said the study’s lead author Geoanna Bautista. Bautista is a neonatologist at UC Davis Children's Hospital. She completed her training at UCLA.
Geoanna Bautista, assistant professor of pediatrics at UC Davis Children’s Hospital.
Piezo1 and the smooth muscle cells
The study also uncovered Piezo1 inside the smooth muscle cells — something that had not been detected before.
“We were surprised to find that Piezo1 is not only present on the surface of the cell sensing stretch — it’s actually located inside the cell, in the sarcoplasmic reticulum. This presence seems to help control the passage of calcium ions — key players in muscle contraction,” explained the study’s senior author, Martín G. Martín. He is a professor of pediatric gastroenterology at UCLA.
Piezo1’s internal positioning suggests that it may be involved in the calcium signaling mechanisms critical for the proper rhythm and force generated during intestinal contractions. Even when the primary calcium channels in the smooth muscle cells were blocked, Piezo1 provided an alternative contraction pathway that helped maintain some muscle function.
New lens to understand gut motility
The study showed that muscle cells without Piezo1 tried to compensate by increasing other calcium-related channels, but the effort wasn’t enough to restore normal gut motility.
“This study gives us a completely new perspective. Piezo1 may be a previously unrecognized regulator of gut health,” Bautista said.
Bautista is now investigating Piezo1’s role during fetal gut development. Her team is studying how its absence affects gut motility and function after birth. Their research may offer insights into many postnatal gut conditions, like gastroschisis, necrotizing enterocolitis (NEC) and short bowel syndrome. These conditions have lifelong adverse health implications.
The study’s coauthors are Yingjie Du, Michael Matthews, Allison Flores, Nicole Kushnir, Nicolle Sweeney, Nam Phuong Nguyen, Elmira Tokhtaeva, RS Solorzano-Vargas, and Ximin He of UCLA; Michael Lewis and Matthias Stelzner of VA Greater Los Angeles Healthcare System; and James Dunn of Stanford University.
