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Evaluation of angularly condensed diquinothiazines as potential anticancer agents.

Abstract：

:We present efficient synthesis of isomeric types of angularly fused diquinothiazines in the reactions of 2,2'-dichloro-3,3'-diquinolinyl disulfide and diquinodithiin with 3-, 5-, 6- and 8-aminoquinolines. The pentacyclic diquinothiazine ring systems were identified as diquino[3,2-b;3',4'-e][1,4]thiazine, diquino[3,2-b;5',6'-e][1,4]thiazine, diquino[3,2-b;6',5'-e][1,4]thiazine and diquino[3,2-b;8',7'-e][1,4]thiazine with advanced two-dimensional 1H and 13C NMR techniques (COSY, ROESY, HSQC and HMBC) of N-methyl derivatives. The identification of pentacyclic ring system was confirmed by X-ray diffraction analysis of selected N-alkyl derivatives. The X-ray analysis revealed different spatial structures of the ring system (planar and folded). NH-diquinothiazines were further transformed into N-alkyl and N-dialkylaminoalkyl derivatives. Most of diquinothiazines exhibited significant cancer cell growth inhibition against the human glioblastoma SNB-19, colorectal carcinoma Caco-2, breast cancer MDA-MB-231 and lung cancer A549 cell lines with the IC50 values < 3 µM. This anti-proliferative activity was found to be more than for cisplatin. The most promising compound, 7-dimethylaminopropyldiquino[3,2-b;6',5'-e]thiazine, was used for gene expression analysis by reverse transcription-quantitative real-time PCR (RT-QPCR) method. The expression of H3, TP53, CDKN1A, BCL-2 and BAX genes revealed that this compound inhibited the proliferation in all cells (H3) and activated mitochondrial events of apoptosis (BAX/BCL-2) in two cancer cell lines (SNB-19 and Caco-2).

journal_name

Bioorg Chem

journal_title

Bioorganic chemistry

authors

Jeleń M,Pluta K,Latocha M,Morak-Młodawska B,Suwińska K,Kuśmierz D

doi

10.1016/j.bioorg.2019.04.005

subject

Has Abstract

pub_date

2019-06-01 00:00:00

pages

810-820

eissn

0045-2068

issn

1090-2120

pii

S0045-2068(19)30152-X

journal_volume

87

pub_type

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