Components of the Biochemistry Core (Core B) detailed in this section of the grant include automated assays for inhibitor screening, cloning and expression of target enzymes, and immunolocalization protocols for both proteases and endogenous inhibitors. We recognize that there may be variation in the type of protease expressed by different tumors, or multiple proteases may be produced by the same tumor. To gain a perspective on protease variation within individual tumors, and to ensure all key targets are examined, we will screen each of our human epithelial cancer tissue banks for proteolytic activity. Automated protease assays will allow detection of individual classes of enzymes in each tumor sample. This screen should provide information on whether certain tumor types will require more than one class-specific inhibitor and whether we should consider targeting other proteases (e.g. cathepsin D, cathepsin L, or other metalloproteases). The automated assays we will use for this retrospective screening of tumor tissue banks may later serve as diagnostic assays to direct inclusion of class-specific inhibitors as adjuvant therapy in individual patients. The Biochemistry Core will also screen tumor cell lines developed and used by the Cell Biology and confirm protease or inhibitor expression for the Transgenic Core (Core C). By comparison to the relevant human cancer tissue bank, the cell lines which best reflect protease expression in actual tumor samples can be identified. Proteases (and, if relevant, protein inhibitors) will be localized by immunohistochemistry or active site-directed biotinylated probes. If any variants of known proteases are identified as having altered substrate specificity or localization, they will be further analyzed by PCR amplification and sequencing. Finally, when tumor samples and cell lines are assayed, aliquots will be provided to Project 3 for assays of multidrug transporter, P-glycoprotein, cytochrome P450s, glutathione-S-transferases and epoxide hydrolases.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Program Projects (P01)
Project #
5P01CA072006-04
Application #
6347376
Study Section
Project Start
2000-08-28
Project End
2001-05-31
Budget Start
1998-10-01
Budget End
1999-09-30
Support Year
4
Fiscal Year
2000
Total Cost
$210,545
Indirect Cost
Name
University of California San Francisco
Department
Type
DUNS #
073133571
City
San Francisco
State
CA
Country
United States
Zip Code
94143
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