P069 CD73 promotes colitis-associated tumourigenesis in mice
X. Wu, X. Liu, N. Lan, X. Zheng, Y. Chen, Z. Cai, P. Lan, X. Wu
The Sixth Affiliated Hospital, Sun Yat-sen University, Department of Colorectal Surgery, Guangzhou, China
Background
Patients with inflammatory bowel disease (IBD) are at a higher risk of developing colitis-associated colorectal cancer. The aim of the present study was to investigate the role of CD73 in IBD-associated tumourigenesis.
Methods
A mouse model of colitis-associated tumourigenesis (CAT) induced by azoxymethane and dextran sulphate sodium (AOM/DSS) was successfully constructed. Model mice were injected with CD73 inhibitor or adenosine receptor agonist. Colon length, body weight loss and tumour formation were assessed macroscopically. Measurement of inflammatory cytokines and RNA sequencing on colon tissues were performed.
Results
Inhibition of CD73 by adenosine 5′-(α,β-methylene) diphosphate (APCP) suppressed the severity of CAT with attenuated weight loss, longer colons, lower tumour number and smaller tumour size when compared with the model group. On the other hand, activation of adenosine receptors using 1-(6-amino-9
Conclusion
Therefore, inhibition of CD73 attenuated IBD-associated tumourigenesis, while activation of adenosine receptors exacerbated tumourigenesis in a C57BL/6J mouse model. This effect may be associated with the expression of pro-inflammatory cytokines and the regulation of ALOX15, Bcl2l15 and Nat8l.