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( Tara Man Kadayat ),( Chanju Song ),( Youngjoo Kwon ),( Eung Seok Lee ) 영남대학교 약품개발연구소 2016 영남대학교 약품개발연구소 연구업적집 Vol.26 No.-
As a part of ongoing studies in developing novel anticancer agents, a series of modified 2,4-diaryl-5H-indeno[1.2-b )pyridines were designed. and synthesized by introducing hydroxyl and chlo-rine moieties. They were evaluated for topoisomerase inhibitory activity and cytotoxicity against HCT15. T47D. and HeLa cancer cell lines. This modification allowed us to demonstrate structure-activity relation-ship (SAR) study with respect to the non-substituted 2,4-diaryl-5H-indenoI1.2-b]pyridines. Compounds (2, 3, 4, S, 8, and 9) with meta or para hydroxyl group on 2 or 4-phenyl ring have enhanced topo I and II inhibitory activity and cytotoxicity. However. additional substitution of chlorine group on furyl or thie-nyl ring (11.12.14.16-18) generally reduced topo I and II inhibitory activity but improved cytotoxicity. The observation of cytotoxic properties and SAR study according to the position of hydroxyl and chlorine group will provide valuable insight for further study of development of novel anticancer agents with related scaffolds.
Bist, Ganesh,Park, Seojeong,Song, Chanju,Thapa Magar, Til Bahadur,Shrestha, Aarajana,Kwon, Youngjoo,Lee, Eung-Seok S.E.C.T. [etc.] 2017 European journal of medicinal chemistry Vol.133 No.-
<P><B>Abstract</B></P> <P>With the aim to develop novel antiproliferative agents, a new series of eighteen dihydroxylated 2,6-diphenyl-4-chlorophenylpyridines were systematically designed, prepared, and investigated for their topoisomerase (topo) I and IIα inhibitory properties and antiproliferative effect in three different human cancer cell lines (HCT15, T47D, and HeLa). Compounds <B>22–30</B> which possess a <I>meta</I>- or <I>para</I>-phenol on 2-, or 6-position of central pyridine ring showed significant dual topo I and topo IIα inhibitory activities with strong antiproliferative activities against all the tested human cancer cell lines. However, compounds <B>13</B>–<B>21</B> which possess an <I>ortho</I>-phenol on 2-, or 6-position of central pyridine ring did not show significant topo I and topo IIα inhibitory activities but displayed moderate antiproliferative activities against all the tested human cancer cell lines. Compound <B>23</B> exhibited the highest antiproliferative potency as much as 348.5 and 105 times compared to etoposide and camptothecin, respectively, in T47D cancer cell line. The structure-activity relationship study revealed that the <I>para</I> position of a hydroxyl group at 2-and 6-phenyl ring and chlorine atom at the <I>para</I> position of 4-phenyl ring of the central pyridine exhibited the most significant topo I and topo IIα inhibition, which might indicate introduction of the chlorine atom at the phenyl ring of 4-pyridine have an important role as dual inhibitors of topo I and topo IIα. Compound <B>30</B> which showed the most potent dual topo I and topo IIα inhibition with strong antiproliferative activity in T47D cell line was selected to perform further study on the mechanism of action, which revealed that compound <B>30</B> functions as a potent DNA non-intercalative catalytic topo I and IIα dual inhibitor.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Dihydroxylated 2,6-diphenyl-4-chlorophenylpyridines were designed and synthesized. </LI> <LI> Introduction of chlorine on 4-phenyl ring of central pyridine showed strong dual topo I and IIα inhibitor. </LI> <LI> Compound <B>30</B> exhibited the most potent dual topo I and IIα inhibition with strong antiproliferative activity. </LI> <LI> Compound <B>30</B> acts as a DNA non-intercalative catalytic topo IIα inhibitor. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Geometric Monte Carlo and black Janus geometries
Bak, Dongsu,Kim, Chanju,Kim, Kyung Kiu,Min, Hyunsoo,Song, Jeong-Pil North-Holland Pub. Co 2017 Physics letters. Section B Vol.767 No.-
<P><B>Abstract</B></P> <P>We describe an application of the Monte Carlo method to the Janus deformation of the black brane background. We present numerical results for three and five dimensional black Janus geometries with planar and spherical interfaces. In particular, we argue that the 5D geometry with a spherical interface has an application in understanding the finite temperature bag-like QCD model via the AdS/CFT correspondence. The accuracy and convergence of the algorithm are evaluated with respect to the grid spacing. The systematic errors of the method are determined using an exact solution of 3D black Janus. This numerical approach for solving linear problems is unaffected initial guess of a trial solution and can handle an arbitrary geometry under various boundary conditions in the presence of source fields.</P>