Prrx1 isoform switching regulates pancreatic cancer invasion and metastatic colonization

Genes & Development
Shigetsugu TakanoAnil K Rustgi

Abstract

The two major isoforms of the paired-related homeodomain transcription factor 1 (Prrx1), Prrx1a and Prrx1b, are involved in pancreatic development, pancreatitis, and carcinogenesis, although the biological role that these isoforms serve in the systemic dissemination of pancreatic ductal adenocarcinoma (PDAC) has not been investigated. An epithelial-mesenchymal transition (EMT) is believed to be important for primary tumor progression and dissemination, whereas a mesenchymal-epithelial transition (MET) appears crucial for metastatic colonization. Here, we describe novel roles for both isoforms in the metastatic cascade using complementary in vitro and in vivo models. Prrx1b promotes invasion, tumor dedifferentiation, and EMT. In contrast, Prrx1a stimulates metastatic outgrowth in the liver, tumor differentiation, and MET. We further demonstrate that the switch from Prrx1b to Prrx1a governs EMT plasticity in both mouse models of PDAC and human PDAC. Last, we identify hepatocyte growth factor ( HGF) as a novel transcriptional target of Prrx1b. Targeted therapy of HGF in combination with gemcitabine in a preclinical model of PDAC reduces primary tumor volume and eliminates metastatic disease. Overall, we provide new insights into t...Continue Reading

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Citations

Sep 18, 2016·Biochemical and Biophysical Research Communications·HuaNan LuoXiaoYong Ren
Jul 10, 2018·RNA Biology·Joice De Faria Poloni, Diego Bonatto
May 5, 2020·Genome Biology and Evolution·Xueyuan Jiang, Raquel Assis
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