AI Article Synopsis
- NQO1 plays a key role in protecting cells from oxidative damage by detoxifying harmful compounds and is found to be elevated in pancreatic cancer tissues and cell lines.
- Immunohistochemistry studies show that both pancreatic cancer and precancerous lesions (PanIN) exhibit higher levels of NQO1 compared to normal pancreatic tissue.
- The compound streptonigrin can effectively kill pancreatic cancer cells by exploiting high NQO1 levels, while inhibiting NQO1 reduces its effectiveness, suggesting NQO1 could be a potential target for pancreatic cancer treatment.
Article Abstract
Quinone oxidoreductase (NQO1) functions as an important part of cellular antioxidant defense by detoxifying quinones, thus preventing the formation of reactive oxygen species. The aims of our study were to determine if NQO1 is elevated in pancreatic cancer specimens and pancreatic cancer cell lines and if so, would compounds previously demonstrated to redox cycle with NQO1 be effective in killing pancreatic cancer cells. Immunohistochemistry of resected pancreatic specimens demonstrated an increased immunoreactivity for NQO1 in pancreatic cancer and pancreatic intraepithelial neoplasia (PanIN) specimens versus normal human pancreas. Immunocytochemistry and Western immunoblots demonstrated inceased immunoreactivity in pancreatic cancer cells when compared to a near normal immortalized human pancreatic ductal epithelial cell line and a colonic epithelial cell line. Streptonigrin, a compound known to cause redox cycling in the presence of NQO1, decreased clonogenic survival and decreased anchorage-independent growth in soft agar. Streptonigrin had little effect on cell lines with absent or reduced levels of NQO1. The effects of streptonigrin were reversed in pancreatic cancer cells pretreated with dicumarol, a known inhibitor of NQO1. NQO1 may be a therapeutic target in pancreatic cancer where survival is measured in months. © 2006 Wiley-Liss, Inc.
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