A research team at SickKids Hospital announced on June 30 that they have uncovered key mechanisms regulating tissue restoration in the stomach, shedding light on how these processes may influence gastric cancer development. The study, conducted by members of the Kim Lab in collaboration with the Rhee Lab at the University of Toronto, used single cell 10x multiome technology to analyze gene expression and DNA regulation within individual stomach cells during different stages of regeneration and recovery.
The researchers found that while the stomach lining has a high regenerative rate necessary for repairing damage from daily stress and acid exposure, this cycle also activates pathways associated with tumor development. According to Adrian Loe, first author and postdoctoral fellow in the Kim Lab, "We expected to see tumors begin to form, but that was not the case. Instead, deleting Arid1a after an injury to stomach cells left them in a persistent state of regeneration, unable to recover."
The team focused on the BRG1/BRM-Associated Factor (BAF) chromatin remodeling complex during recovery phases. They specifically deleted Arid1a—a gene frequently altered in gastric cancer—within this complex and observed that affected cells remained stuck in a regenerative but non-cancerous state following injury. When Trp53, another gene commonly tied to cancer, was subsequently removed from these unresolved regenerative cells lacking Arid1a, it triggered cancer formation and spread.
These findings suggest that genetic variants associated with cancer do not act independently but depend on environmental conditions within tissues. The research highlights how incomplete cellular recovery increases susceptibility to gastric cancer beyond what is caused by normal cycles of healing.
"Regenerative medicine is a dynamic and fast-moving area of research, but we can't lose sight of the fact that we need to better understand how to control regeneration as well," said Dr. Kim. "That's because, as our study showed, it opens a susceptibility to cancer." Kim added, "As the field of regenerative medicine advances, we must also focus on studying how the conditions that return [cells] to a healthy balanced state."
