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. 1996 Nov;74(9):1423–1426. doi: 10.1038/bjc.1996.559

Presence of endothelial calcium-dependent nitric oxide synthase in breast apocrine metaplasia.

W Tschugguel 1, W Knogler 1, K Czerwenka 1, M Mildner 1, W Weninger 1, R Zeillinger 1, J C Huber 1
PMCID: PMC2074759  PMID: 8912539

Abstract

Endothelial calcium-dependent nitric oxide (NO) synthase has been shown to be expressed in human malignant breast tumours, and its presence correlates with tumour grade. Moreover, NO, being synthesised in breast tumour cells, may increase tumour blood flow and promote angiogenesis. In view of these aspects, we have assessed the distribution of NO synthase within a series of benign breast tumours using a monoclonal antibody against human endothelial calcium-dependent NO synthase. Activity was predominantly localised in apocrine metaplastic cells of fibrocystic disease, as well as in endothelia throughout all tissue sections. Consistent with previous reports, no endothelial calcium-dependent NO synthase immunoreactivity was observed in poorly differentiated infiltrating duct carcinoma cells. In conclusion, expression of endothelial calcium-dependent NO synthase in human breast apocrine metaplasia may be of significance in view of the NO's vascular effects in benign breast disease.

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Selected References

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