Abstract:
:Betulinic acid (BA), a pentacyclic triterpenoid, exhibits broad spectrum antiproliferative activity, but generally with only modest potency. To improve BA's pharmacological properties, fluorine was introduced as a single atom at C-2, creating two diastereomers, or in a trifluoromethyl group at C-3. We evaluated the impact of these groups on antiproliferative activity against five human tumor cell lines. A racemic 2-F-BA (compound 6) showed significantly improved antiproliferative activity, while each diastereomer exhibited similar effects. We also demonstrated that 2-F-BA is a topoisomerase (Topo) I and IIα dual inhibitor in cell-based and cell-free assays. A hypothetical mode of binding to the Topo I-DNA suggested a difference between the hydrogen bonding of BA and 2-F-BA to DNA, which may account for the difference in bioactivity against Topo I.
journal_name
Bioorg Med Chemjournal_title
Bioorganic & medicinal chemistryauthors
Li J,Chang LC,Hsieh KY,Hsu PL,Capuzzi SJ,Zhang YC,Li KP,Morris-Natschke SL,Goto M,Lee KHdoi
10.1016/j.bmc.2019.05.016subject
Has Abstractpub_date
2019-07-01 00:00:00pages
2871-2882issue
13eissn
0968-0896issn
1464-3391pii
S0968-0896(19)30523-1journal_volume
27pub_type
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