Researchers found that pancreatic acinar cells respond to mitochondrial or metabolic stress by producing the chemokine CXCL13, triggering a short term repair program in healthy tissue. This response protects stressed cells from apoptosis and promotes regeneration by activating YAP in neighboring cells, allowing the pancreas to restore integrity without excess inflammation or scarring. Stressed cells also temporarily express PD-L1, enabling them to evade immune clearance just long enough to complete repair before being eliminated.

However, when this pathway is chronically activated, it becomes harmful. In the aging pancreas, stressed and

nt cells accumulate and continuously express CXCL13, YAP, and PD-L1, creating a persistent cycle that attracts immune cells, drives chronic inflammation, and leads to pancreatic steatosis. In mouse models, blocking CXCL13 reduced senescent cell burden, decreased immune infiltration, and improved tissue health, highlighting its role in age related dysfunction.

The study also showed that pancreatic cancers hijack this same mechanism. Cancer cells produce CXCL13 continuously, sustaining protective signals, activating YAP in surrounding cells, and promoting the transformation of nearby acinar cells into precancerous lesions. This accelerates tumor growth, fibrosis, and inflammation. Inhibiting CXCL13 or YAP significantly slowed tumor progression and reduced abnormal proliferation and fibrosis.

Importantly, human pancreatic cancer samples displayed similar expression patterns of CXCL13, YAP, PD-L1, and p16, confirming that this stress response pathway is conserved across species. Overall, the findings identify the CXCL13/YAP/PD-L1 axis as a central regulator linking tissue repair, aging, and cancer, with short term activation being beneficial but prolonged signaling driving disease. Targeting this pathway may offer new therapeutic strategies for both age related degeneration and pancreatic cancer.
source: https://www.cira.kyoto-u.ac.jp/e/pressrelease/news/260502-030000.html