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pubmed:abstractText |
We have characterised the mechanisms involved in the antiproliferative effect of NO in human airway smooth muscle cells (HASMC). S-Nitroso-N-acetyl penicillamine, a nitric oxide donor, inhibited proliferation in both G(1) and S phases of the cell cycle. Additionally, experiments with 8-bromo-cGMP, haemoglobin, a NO scavenger and zaprinast, a cGMP-specific phosphodiesterase inhibitor, showed that both effects were NO-mediated. The G(1) phase inhibition was cGMP-dependent whereas the S phase inhibition was due to a cGMP-independent inhibition of ribonucleotide reductase. These results demonstrate that NO inhibits HASMC proliferation by cGMP-dependent and -independent mechanisms acting at distinct points in the cell cycle.
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