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Role of ALDH1 in the prognosis of esophageal cancer and its relationship with tumor microenvironment.
Molecular Carcinogenesis 2018 January
Aldehyde dehydrogenase 1 (ALDH1) is associated with tumorigenesis, and significantly increased in cancer stem-like cells. In the present study, the role of ALDH1 in esophageal squamous cell carcinoma (ESCC) was investigated. We retrospectively analyzed the clinical outcomes of 148 ESCC and examined its correlation with ALDH1 levels. Furthermore, we preformed cellular and animal experiments to investigate the role of ALDH1 in tumor progression and microenvironment. Our data revealed that ALDH1 staining was positively linked to a higher clinical stage, higher loco-regional failure rate, and shorter survival time. Furthermore, there was a positive link between ALDH1 expression and IL-6 signaling according to the data of clinical specimens and cellular experiments. Using animal model, ALDH1-positive tumors were associated with aggressive tumor growth, increased IL-6, augmented epithelial-mesenchymal transition (EMT), and activation of myeloid-derived suppressor cells (MDSCs). Blockade of COX-2 attenuated the aggressive tumor growth of ALDH1-positive cancer cells. In conclusion, our findings suggested that ALDH1 played an important role in tumor aggressiveness and associated with a tumor-promoting microenvironment in esophageal cancer. Directly targeting ALDH1 or using a COX-2 inhibitor could be a promising strategy for the treatment of ESCC.
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