Desmoplasia in the extracellular matrix (ECM) is one of the hallmarks of pancreatic cancer (PC), a virtually incurable disease. Decorin, a classical small leucine-rich proteoglycan found in the ECM, was upregulated in PC tissue samples according to the data of TCGA. However, decorin plays a protective role in the ECM. So it is necessary to study the roles of decorin in the progression of PC. A significantly upregulated expression of decorin was observed in the PC tissue samples compared with the normal tissues. However, there was no considerable difference in the level of expression of decorin during different pathological stages, which was supported by the immunoblot analysis. Western blot showed a higher expression of decorin A in the para-carcinoma tissue than in the cancerous tissue but the expression of decorin B, C, and D was elevated in the cancerous tissue. The results of the MTT and scratch wound healing assays revealed an elevated proliferation ability and migration rate in decorin B-overexpressing cells but were inhibited in the decorin A-overexpressing cells. Overexpression of decorin A significantly elevated the expression of the apoptosis-related genes and Decorin B-overexpression elevated proliferation-related genes. All the results showed that decorin B played important roles in the promoting of PC.
Keywords: decorin; expression profile; isoforms; pancreatic cancer.