Sørensen KMJ, Meldgaard T, Melchjorsen CJ, Fridriksdottir AJ, Pedersen H, Petersen OW, Kristensen P. Upregulation of Mrps18a in breast cancer identified by selecting phage antibody libraries on breast tissue sections.
BMC Cancer 2017;
17:19. [PMID:
28056857 PMCID:
PMC5376696 DOI:
10.1186/s12885-016-2987-5]
[Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Accepted: 12/09/2016] [Indexed: 12/04/2022] Open
Abstract
Background
One of the hallmarks of cancer is an altered energy metabolism, and here, mitochondria play a central role. Previous studies have indicated that some mitochondrial ribosomal proteins change their expression patterns upon transformation.
Method
In this study, we have used the selection of recombinant antibody libraries displayed on the surface of filamentous bacteriophage as a proteomics discovery tool for the identification of breast cancer biomarkers. A small subpopulation of breast cells expressing both cytokeratin 19 and cytokeratin 14 was targeted using a novel selection procedure.
Results
We identified the mitochondrial ribosomal protein s18a (Mrps18a) as a protein which is upregulated in breast cancer. However, Mrps18a was not homogeneously upregulated in all cancer cells, suggesting the existence of sub-populations within the tumor. The upregulation was not confined to cytokeratin 19 and cytokeratin 14 double positive cells.
Conclusion
This study illustrates how phage display can be applied towards the discovery of proteins which exhibit changes in their expression patterns. We identified the mitochondrial protein Mrps18a as being upregulated in human breast cancer cells compared to normal breast cells.
Electronic supplementary material
The online version of this article (doi:10.1186/s12885-016-2987-5) contains supplementary material, which is available to authorized users.
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