Chronic inflammation confers to the metabolic reprogramming associated with tumorigenesis of colorectal cancer

ABSTRACT

It's well known that microenvironment inflammatory signals could promote cancer development and progression. In colorectal cancer (CRC), chronic inflammation is a major driving mechanism for the development of CRC in patients having long-standing inflammatory bowel disease (IBD). Though it has been addressed that cancer cells ferment much of their glucose supply into lactate regardless of the presence of oxygen, it is unclear whether cell metabolism has been reprogramed during the process from IBD to CRC. Herein, with dextran sulfate sodium (DSS)-induced mouse colitis model, we found that inflammation upregulated key glycolytic enzymes expression via activation of STAT3/c-Myc signaling pathway. Interestingly, during the whole phase of chronic inflammation, the key metabolic enzymes demonstrated increased expression constantly, indicating the metabolic reprogramming was induced by long-term inflammatory signal. Moreover, either the inhibition of STAT3 signaling or c-Myc activity could block the glycolytic enzymes expression induced by interleukin 6 (IL-6). Thus, we presented the view that inflammation could induce the metabolic reprogramming and promote the progression from chronic colitis to colorectal cancer.

KEYWORDS:

• Chronic inflammation
• c-Myc
• IL-6
• metabolic reprogramming
• STAT3

Disclosure of potential conflicts of interest

No potential conflicts of interest were disclosed.

Funding

This work was supported by National High-tech R&D Program of China for Young Scientist (863 Program, 2014AA020517), and National Natural Science Research Program of China (31401161, 81372390, 31571437, 81230043, 81421003, 81672751).