Role of nitric oxide in tumour progression with special reference to a murine breast cancer model

Canadian Journal of Physiology and Pharmacology
L C JadeskiP K Lala

Abstract

Nitric oxide (NO) is a potent bioactive molecule produced in the presence of NO synthase (NOS) enzymes, which mediates numerous physiological functions under constitutive conditions. Sustained overproduction of NO (and NO-reaction products), typically under inductive conditions, can lead to cell cycle arrest and cellular apoptosis. Furthermore, carcinogenesis may result from mutational events following NO-mediated DNA damage and hindrance to DNA repair (e.g., mutation of tumour-suppressor gene p53). In a majority of human and experimental tumours, tumour-derived NO appears to stimulate tumour progression; however, for a minority of tumours, the opposite has been reported. This apparent discrepancy may be explained by differential susceptibility of tumour cells to NO-mediated cytostasis or apoptosis, and the emergence of NO-resistant and NO-dependent clones. NO-resistance may be mediated by p53 inactivation, and upregulation of cyclo-oxygenase-2 and heat shock protein 70 (HSP70). In a murine mammary tumour model, tumour-derived NO promoted tumour growth and metastasis by enhancing invasive, angiogenic, and migratory capacities of tumour cells. Invasion stimulation followed the altered balance of matrix metalloproteases and their...Continue Reading

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