In 95% of patients with pancreatic ductal adenocarcinoma (PDAC), recurrence is observed following chemotherapy. Findings from several studies have indicated that cancer stem cells (CSCs) are resistant to anti-cancer agents and may be involved in cancer recurrence and metastasis. The CD44 protein is a major CSC marker, and CD44 also plays an indispensable role in the CSC properties in several cancers, including pancreatic cancer; however, no clinical approach exists to inhibit CD44 activity. Here, we have performed knockin/knock down experiments and we demonstrate that the forkhead box O3 (FOXO3)/liver kinase B1 (LKB1)/AMP-activated protein kinase (AMPK)/PPAR-γ co-activator-1β (PGC- 1β)/pyruvate dehydrogenase -A1 (PDHA1) pathway is essential for CD44 expression and CSC properties. We observed that patients exhibiting high PDHA1 expression have a poor prognosis. Systemic PGC-1β knockout mice are fertile and viable and do not exhibit an overt phenotype under normal conditions. This suggests that cGMP induction and PGC-1β inhibition represent potential strategies for treating patients with PDAC.
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