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. 2022 Jun 3;27(11):3597.
doi: 10.3390/molecules27113597.

Synthesis and Anticancer Properties of New 3-Methylidene-1-sulfonyl-2,3-dihydroquinolin-4(1 H)-ones

Affiliations

Synthesis and Anticancer Properties of New 3-Methylidene-1-sulfonyl-2,3-dihydroquinolin-4(1 H)-ones

Agata Jaskulska et al. Molecules. .

Abstract

Quinolinones have been known for a long time as broad-spectrum synthetic antibiotics. More recently, the anticancer potential of this group of compounds has been investigated. Following this direction, we obtained a small library of 3-methylidene-1-sulfonyl-2,3-dihydroquinolin-4(1H)-ones with various substituents at positions 1, 2, 6, and 7 of the quinolinone ring system. The cytotoxic activity of the synthesized analogs was tested in the MTT assay on two cancer cell lines in order to determine the structure-activity relationship. All compounds produced high cytotoxic effects in MCF-7, and even higher in HL-60 cells. 2-Ethyl-3-methylidene-1-phenylsulfonyl-2,3-dihydroquinolin-4(1H)-one, which was over 5-fold more cytotoxic for HL-60 than for normal HUVEC cells, was selected for further tests. This analog was shown to inhibit proliferation and induce DNA damage and apoptosis in HL-60 cells.

Keywords: Horner–Wadsworth–Emmons olefination; apoptosis; cytotoxicity; structure–activity relationship.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Chemical structure of quinoline, 4-quinolinones, and some diversely substituted analogs with quinolone skeleton.
Scheme 1
Scheme 1
Synthesis of 3-methylidene-1-sulfonyl-2,3-dihydroquinolin-4(1H)-ones 5a-t.
Figure 2
Figure 2
Structure of the selected compound 5a (a). Metabolic activity of (b) HL-60 and HUVEC cells treated with various concentrations of 5a for 48 h; (c) HL-60 cells treated with various concentration of 5a for 24 h, measured by MTT assay.
Figure 3
Figure 3
Representative scattered blots of multiparameter flow cytometry analysis of cell proliferation, DNA damage and apoptosis in HL-60 cells treated with 5a (1.8µM) for 24 h. Panel (a): DAPI vs. BrdU PerCP-Cy.5.5 staining profile. BrdU positive cells are in the inside frame. Panel (b): cleaved PARP (Asp214) PE vs. H2AX (pS139) Alexa profile. Squares Q1 + Q2 represent H2AX (pS139) Alexa positive cells, squares Q2 + Q4 represent cleaved PARP (Asp214) PE positive cells, whereas square Q3 represents H2AX (pS139) Alexa and cleaved PARP (Asp214) PE negative cells.
Figure 4
Figure 4
Quantitative analysis of inhibition of cell proliferation (BrdU test); (a) induction of apoptosis (PARP test) (b) and induction of DNA damage (H2AX test) (c) by 5a (1.8 µM) in HL-60 cells. Data are presented as mean ± SEM of three independent experiments. Statistical significance was assessed using one-way ANOVA and a post-hoc multiple comparison Student–Newman–Keuls test. *** p < 0.001 vs. control.
Figure 5
Figure 5
Induction of apoptosis in HL-60 cells treated with 5a (1.8 µM) for 24 h: (a) Representative scattered blots of flow cytometry analysis of apoptosis by double-staining with FITC-Annexin-V and PI. The percentage of viable cells is shown in quadrant Q3. Quadrant Q4 indicates the percentage of early apoptotic cells (Annexin V-positive cells), whereas quadrant Q2 shows the percentage of late apoptotic/death cells (Annexin V-and PI-positive cells). (b) Quantitative analysis of apoptotic cell death by Annexin V and PI assay. Data are presented as mean ±SEM of three independent experiments. Statistical significance was assessed using Student’s t test. *** p < 0.001 vs. control.
Figure 6
Figure 6
Real-time PCR analysis of ABCB1 mRNA levels in HL-60 cells treated with 5a for 24 h. Data are presented as mean ± SEM of three independent experiments. Statistical significance was assessed using one-way ANOVA and a post-hoc multiple comparison Student–Newman–Keuls test. * p < 0.05 vs. control.

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