A prenylated flavonol, sophoflavescenol: a potent and selective inhibitor of cGMP phosphodiesterase 5

  • Bioorg Med Chem Lett. 2002 Sep 2;12(17):2313-6. doi: 10.1016/s0960-894x(02)00401-8.
Hye Joo Shin  1 ,  Hyoung Ja Kim ,  Jong Hwan Kwak ,  Hyung Ok Chun ,  Je Hak Kim ,  Hokoon Park ,  Dong Hyun Kim ,  Yong Sup Lee
Affiliations
  • 1. Division of Life Sciences, Korea Institute of Science & Technology, Cheongryang, Seoul, Republic of Korea.
PMID: 12161123 DOI: 10.1016/s0960-894x(02)00401-8
Abstract

During the search for naturally occurring cyclic guanosine monophosphate (cGMP)-specific phosphodiesterase type 5 (PDE5) inhibitors, it was found that the extracts from Sophora flavescens exhibit potent inhibitory activity against cGMP PDE5 prepared from rat diaphragm. Therefore, the inhibitory activities of five Flavonoids, kushenol H (1), kushenol K (2), kurarinol (3), sophoflavescenol (4) and kuraridine (5), isolated from S. flavescens were measured against cGMP PDE5 to identify potent cGMP PDE5 inhibitory constituents. Among tested compounds, sophoflavescenol (4), a C-8 prenylated flavonol, showed the most potent inhibitory activity (IC(50)=0.013 microM) against cGMP PDE5 with 31.5- and 196.2-fold selectivity over PDE3 and PDE4, respectively. Kinetic analysis revealed that sophoflavescenol was a mixed inhibitor of PDE5 with a K(i) value of 0.005 microM.

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