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Published 15 October 2001. doi:10.1083/jcb.200107001
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© The Rockefeller University Press, 0021-9525/2001/10/271 $5.00
The Journal of Cell Biology, Volume 155, Number 2, October 15, 2001 271-278


Article

Rapid nitric oxide–induced desensitization of the cGMP response is caused by increased activity of phosphodiesterase type 5 paralleled by phosphorylation of the enzyme



Florian Mullershausen1, Michael Russwurm1, W. Joseph Thompson2, Li Liu2, Doris Koesling1 and Andreas Friebe1

1 Abteilung für Pharmakologie und Toxikologie, Medizinische Fakultät, Ruhr-Universität Bochum, D-44780 Bochum, Germany
2 Cell Pathways, Inc., Horsham, PA 19044

Address correspondence to Doris Koesling, Abteilung für Pharmakologie und Toxikologie, Medizinische Fakultät, Ruhr-Universität Bochum, Universitätssr. 150, D-44780 Bochum, Germany. Tel.: 49-234-3226827. Fax: 49-234-3214521. E-mail: doris.koesling{at}ruhr-uni-bochum.de

Most of the effects of the signaling molecule nitric oxide (NO) are mediated by cGMP, which is synthesized by soluble guanylyl cyclase and degraded by phosphodiesterases. Here we show that in platelets and aortic tissue, NO led to a biphasic response characterized by a tremendous increase in cGMP (up to 100-fold) in less than 30 s and a rapid decline, reflecting the tightly controlled balance of guanylyl cyclase and phosphodiesterase activities. Inverse to the reported increase in sensitivity caused by NO shortage, concentrating NO attenuated the cGMP response in a concentration-dependent manner. We found that guanylyl cyclase remained fully activated during the entire course of the cGMP response; thus, desensitization was not due to a switched off guanylyl cyclase. However, when intact platelets were incubated with NO and then lysed, enhanced activity of phosphodiesterase type 5 was detected in the cytosol. Furthermore, this increase in cGMP degradation is paralleled by the phosphorylation of phosphodiesterase type 5 at Ser-92. Thus, our data suggest that NO-induced desensitization of the cGMP response is caused by the phosphorylation and subsequent activity increase of phosphodiesterase type 5.

Key Words: phosphodiesterase; cGMP; NO-sensitive guanylyl cyclase; platelets; desensitization


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