The development of cancer cell resistance to various cytotoxic stimuli continues to be a major challenge in oncology and novel therapeutic approaches are urgently needed. Nitric oxide (NO) is emerging as a potential anti-oncogenic agent to overcome tumor cell resistance to conventional
therapeutic agents. NO is a ubiquitous, water-soluble, free radical gas that exerts a wide range of biological effects. The actions of nitric oxide are highly variable in oncology with reports in the literature on both sides of the spectrum as an anti-neoplastic vs. a pro-neoplastic agent.
The final activity of NO in oncology is dependent on its working microenvironment, including the type of cell exposed to the compound, the redox state of the reaction, as well as the final intracellular concentration and the duration of intracellular exposure to nitric oxide. There is, however,
no unifying mechanistic explanation for the biphasic role of nitric oxide in oncology. Nitric oxide donors mimic continuous production of NO in a wide range of time intervals (seconds to days). Thus, multiple biological and (pro- vs. anti-) neoplastic responses are elicited from NO donors
depending on the half-life and the type of cell exposed to the compound. The large variety of nitric oxide donors may serve as a tool to explore the wide range of oncologic properties of NO in cancer. In the present report, we discuss classic nitric oxide donors and their potential therapeutic
roles as cytotoxic agents or chemo-radio or -immune-sensitizing compounds in the treatment of drug-resistant cancers.
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Document Type: Research Article
Department of Gastrointestinal and Endocrine Surgery, UT Southwestern Medical Center/VA North Texas Health Care System, Dallas, TX 75216, USA., Email: [email protected]
November 1, 2008
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The International Journal of Oncology provides an international forum for the publication of the latest, cutting-edge research in the broad area of oncology and cancer treatment. The journal accepts original high quality works and reviews on all aspects of oncology research including carcinogenesis, metastasis, epidemiology, chemotherapy and viral oncology. Through fair and efficient peer review, the journal is dedicated to publishing top tier research in the field, offering authors rapid publication as well as high standards of copy-editing and production. The International Journal of Oncology is published on a monthly basis in both print and early online.
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