Abstract
Polyamines are important for cell growth and proliferation and they are formed from arginine and ornithine via arginase and ornithine decarboxylase (ODC). Arginine may alternatively be metabolised to NO via NO synthase. Here we study if vascular smooth muscle cell proliferation can be reversed by polyamine synthesis inhibitors and investigate their mechanism of action. Cell proliferation was assessed in cultured vascular smooth muscle A7r5 cells and in endothelium-denuded rat arterial rings by measuring [3H]-thymidine incorporation and by cell counting. Cell cycle phase distribution was determined by flow cytometry and polyamines by HPLC. Protein expression was determined by Western blotting. The ODC inhibitor DFMO (1–10 mM) reduced polyamine concentration and attenuated proliferation in A7r5 cells and rat tail artery. DFMO accumulated cells in S phase of the cell cycle and reduced cyclin A expression. DFMO had no effect on cell viability and apoptosis as assessed by fluorescence microscopy. Polyamine concentration and cellular proliferation were not affected by the arginase inhibitor NOHA (100–200 μM) and the NO synthase inhibitor l-NAME (100 μM). Lack of effect of NOHA was reflected by absence of arginase expression. Polyamine synthesis inhibition attenuates vascular smooth muscle cell proliferation by reducing DNA synthesis and accumulation of cells in S phase, and may be a useful approach to prevent vascular smooth muscle cell proliferation in cardiovascular diseases.
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Acknowledgments
This study was supported by grants from the Swedish Research Council (71X-28, 52X-20308), the Berta Kamprad Foundation, the Crafoord Foundation, the IngaBritt and Arne Lundberg Foundation, the Swedish Dental Society, the Torsten and Ragnar Söderberg Foundation, the University Hospital of Lund Foundation and the Vascular Wall Programme at Lund University. We gratefully thank Ina Nordström and Lena Thiman for skilled technical assistance with the Western blotting and HPLC. To the memory of Malin Odenlund, deceased 16 June 2007.
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Odenlund, M., Holmqvist, B., Baldetorp, B. et al. Polyamine synthesis inhibition induces S phase cell cycle arrest in vascular smooth muscle cells. Amino Acids 36, 273–282 (2009). https://doi.org/10.1007/s00726-008-0060-7
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DOI: https://doi.org/10.1007/s00726-008-0060-7