Researchers discovered that pancreatic acinar cells produce the chemokine CXCL13 in response to mitochondrial or metabolic stress. In healthy tissue, this CXCL13-mediated response is short‑lived—protecting stressed cells from apoptosis and stimulating the proliferation of nearby healthy cells through YAP activation—enabling the pancreas to restore tissue integrity without excessive inflammation or scarring. The team found that stressed cells also transiently express PD‑L1, helping them evade immune clearance only long enough to complete tissue repair before they naturally disappear.

In contrast, this protective system becomes detrimental when chronically activated. In aged pancreas, stressed and senescent cells accumulate, exhibiting sustained expression of CXCL13, YAP, and PD‑L1. This persistent signaling loop attracts immune cells, drives chronic inflammation, and leads to progressive pancreatic steatosis, a hallmark of age‑related pancreatic decline. When aged mice were treated with a CXCL13‑neutralizing antibody, senescent cells decreased, immune infiltration subsided, and steatosis improved markedly, indicating that the CXCL13 pathway is a key driver of age‑dependent tissue dysfunction.

The study further revealed how pancreatic cancers exploit this same axis. In mouse models carrying oncogenic mutations, cancer cells produced CXCL13 continuously rather than transiently. This prolonged signaling protected stressed cancer cells, activated YAP in surrounding non‑cancerous cells, and promoted the unexpected non-cell‑autonomous transformation of nearby acinar cells into precancerous lesions. As a result, tumors grew faster, fibrosis intensified, and inflammation escalated. Blocking either CXCL13 or YAP signaling significantly reduced tumor progression, diminished abnormal cell proliferation, and alleviated fibrosis, demonstrating the therapeutic potential of interrupting this pathway.

Importantly, human pancreatic cancer samples exhibited CXCL13, YAP, PD‑L1, and p16 expression consistent with mouse findings. This cross‑species similarity suggests that the CXCL13/YAP/PD‑L1 axis functions as a core stress‑response program shared by aging tissues and cancer.

Together, these findings highlight CXCL13 as the common upstream regulator orchestrating pancreatic homeostasis, age‑related chronic inflammation, and cancer progression. By showing that the same signaling system can be restorative when short‑lived but detrimental when prolonged, the study provides a conceptual framework for understanding how cellular stress responses shape tissue in health and disease. The ability of CXCL13 blockade to reduce senescent cells, alleviate age‑related pathology, and suppress cancer growth further suggests that targeting this axis could open new therapeutic avenues for both degenerative and malignant pancreatic diseases.

• doi: 10.1126/sciadv.adu7865