Aim: To characterise the protein expression profiles of pancreatic islet β-cells affected by cancer cells, and to identify the potential islet molecules related to pancreatic cancer-associated diabetes.
Methods: The cellular proteins of islet β-cell line INS-1 in response to conditioned medium (CM) prepared from pancreatic cancer cells were analysed using fluorescence-labelled 2D gel-based proteomics (2D-DIGE).
Results: 10 proteins were over-expressed and five were under-expressed in cancer CM-stimulated β-cells. Five differently expressed proteins were selected for further validation by Western blot analysis. HSP60 and peripherin, which have previously been reported to be associated with type 1 diabetes, and Prp19, a DNA repair protein, were up-regulated in INS-1 cells after cancer cell CM stimulation; HMOX1 and GRP78 were down-regulated. The islets adjacent to human pancreatic carcinomas showed increased peripherin expression than normal pancreatic islets.
Conclusion: These results provide new information regarding the regulation of protein expression in pancreatic cancer-associated diabetes.
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Funding This work was supported by Key Project of Department of Science & Technology of Shandong Province, China (No.2005GG1102003).
Competing interests None.
Provenance and Peer review Not commissioned; externally peer reviewed.
Ethics approval Ethics approval was obtained.