Role of nitric oxide in angiogenesis and tumor progression in head and neck cancer

Journal of the National Cancer Institute
O GalloM Ziche

Abstract

Angiogenesis (formation of new blood vessels) is associated with tumor growth and metastasis in patients with solid tumors, including those of the head and neck. Nitric oxide (NO) production may contribute to these processes. We assessed the role of the NO pathway in angiogenesis and tumor progression in patients with head and neck cancer. Biochemical assays were used to measure NO synthase (NOS) activity and cyclic guanosine monophosphate (cGMP) levels in specimens of tumor and normal mucosa obtained from 27 patients. Microvessels in tumor specimens were identified by CD-31-specific immunohistochemical staining. Associations between microvessel densities, levels of NOS, and cGMP were examined by use of two-sided statistical tests. Tumor specimens and human squamous carcinoma A-431 cells were grown as explants on the corneas of rabbits, and the effect of the NOS inhibitor N(omega)-nitro-L-arginine-methyl ester (L-NAME) was tested. Levels of total NOS, inducible NOS, and cGMP were higher in tumor specimens than in specimens of normal mucosa (all P<.0001). Tumor specimens from patients with lymph node metastases presented a higher total NOS activity (P = .005) and were markedly more vascularized than tumor specimens from patients...Continue Reading

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