期刊
ONCOGENE
卷 26, 期 1, 页码 65-76出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/sj.onc.1209755
关键词
direct tissue proteomics (DTP); LC-MS/MS; prostate cancer; Wnt; formalin-fixed paraffin-embedded tissues; prostate-specific antigen (PSA)
资金
- NCRR NIH HHS [RR019436] Funding Source: Medline
- NHLBI NIH HHS [P01 HL70694, HL 67569] Funding Source: Medline
Successful treatment of multiple cancer types requires early detection and identification of reliable biomarkers present in specific cancer tissues. To test the feasibility of identifying proteins from archival cancer tissues, we have developed a methodology, termed direct tissue proteomics (DTP), which can be used to identify proteins directly from formalin-fixed paraffin-embedded prostate cancer tissue samples. Using minute prostate biopsy sections, we demonstrate the identification of 428 prostate-expressed proteins using the shotgun method. Because the DTP method is not quantitative, we employed the absolute quanti. cation method and demonstrate picogram level quantification of prostate-specific antigen. In depth bioinformatics analysis of these expressed proteins affords the categorization of metabolic pathways that may be important for distinct stages of prostate carcinogenesis. Furthermore, we validate Wnt-3 as an upregulated protein in cancerous prostate cells by immunohistochemistry. We propose that this general strategy provides a roadmap for successful identification of critical molecular targets of multiple cancer types.
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