Journal
DRUG RESEARCH
Volume 66, Issue 5, Pages 270-274Publisher
GEORG THIEME VERLAG KG
DOI: 10.1055/s-0035-1569405
Keywords
urate; no production; eNOS; HUVEC
Funding
- Torii pharmaceutical company, Tokyo, Japan
- MSD, Tokyo, Japan
- Dainippon Sumitomo Pharma, Tokyo, Japan
- Grants-in-Aid for Scientific Research [25670600, 25461057, 26461258] Funding Source: KAKEN
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Background: Although urate impaired the endothelial function, its underlying mechanism remains unknown. We hypothesized that urate impaired nitric oxide (NO) production in human umbilical vein endothelial cells (HUVECs) via activation of uric acid transporters (UATs). Purpose and method: In the present study, we studied effects of urate on NO production and eNOS protein expression in HUVEC cells in the presence and absence of urate lowering agents using molecular biological and biochemical assays. Results: HUVECs expressed the 4 kinds of UATs, URATv1, ABCG2, MRP4 and MCT9. Exposure to urate at 7mg/dl for 24h significantly reduced production of NO. Pretreatment with benzbromarone, losartan or irbesartan normalized NO production. The same exposure resulted in dephosphorylation of endothelial NO synthase (eNOS) in HUVECs. Again pretreatment with benzbromarone, losartan or irbesartan abolished this effect. Conclusion: Urate reduced NO production by impaired phosphorylation of eNOS in HUVEC via activation of UATs, which could be normalized by urate lowering agents.
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