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Nitric oxide-generating compounds inhibit total protein and collagen synthesis in cultured vascular smooth muscle cells

Nitric oxide-generating compounds inhibit total protein and collagen synthesis in cultured vascular smooth muscle cells

Circulation Research 76(2): 305-309

ISSN/ISBN: 0009-7330

PMID: 7834842

Nitric oxide (NO) participates in the regulation of vascular tone and smooth muscle cell proliferation, but little is known of its effect on total protein and matrix synthesis in smooth muscle. We studied the effects of the NO-generating compounds S-nitroso-N-acetylpenicillamine (SNAP, 0.4 to 1.2 mmol/L) and sodium nitroprusside (SNP, 0.1 to 0.5 mmol/L) on total protein (using (3H)leucine) and collagen (using (3H)proline) synthesis in cultured rabbit aortic smooth muscle cells. Both agents caused dose-dependent inhibition of the relative rate of protein (maximum reduction of 87% (SNAP) and 80% (SNP)) and collagen synthesis, as measured by trichloroacetic acid-precipitated label. The magnitudes of percent inhibition of total protein and collagen synthesis were approximately equal. Inhibition of protein synthesis by SNAP and SNP was prevented by hemoglobin (10 mu-mol/L), suggesting that the protein synthesis inhibition was due to NO release. Inhibition of protein synthesis was reversible after removal of SNAP and SNP and was not caused by damage to the cells. These results suggest that NO may function as a modulator of vascular smooth muscle cell protein synthesis and production of extracellular matrix components.

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Accession: 009099093

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