Design, synthesis of novel chromene-based scaffolds targeting hepatocellular carcinoma: Cell cycle arrest, cytotoxic effect against resistant cancer cells, apoptosis induction, and c-Src inhibition.

New chromene derivatives were synthesized based on 4-(3,4-dimethoxy)-4H-chromene scaffold. All target compounds exhibited cytotoxic activity against HepG2 cells (IC50 = 2.40-141.22 µM). Chromens 5 and 9 showed superior cytotoxicity over staurosporine (IC50 = 18.27 µM) and vinblastine (IC50 = 5.20 µM). c-Src kinase inhibition assay of compounds 5 and 9 displayed the dominant c-Src inhibitory activity of 5 (IC50 = 0.184 µM) over 9 (IC50 = 0.288 µM). The safety of the most potent compound 5 against normal WI-38 cells was confirmed via its IC50 of 115.75 µM comparable with 5-FU (IC50 = 16.28 µM). Moreover, the promising chromene 5 displayed potent cytotoxicity against resistant HepG2 cells with IC50 of 26.03 µM comparable with 5-FU (IC50 = 42.68 µM). The most active chromene 5 arrested the HepG2 cell cycle at the S phase and induced a 29-fold increase in the total number of apoptotic cells indicating pre-G1 apoptosis. The ability of compound 5 to induce apoptosis was supported via elevation of caspase-3, caspase-7, caspase-9 and proapoptotic Bax protein levels in addition to downregulation of the antiapoptotic Bcl2 protein. Molecular docking studies of compound 5 showed good binding interaction pattern inside c-Src kinase enzyme active site.

Novel pyrazole-based COX-2 inhibitors as potential anticancer agents: Design, synthesis, cytotoxic effect against resistant cancer cells, cell cycle arrest, apoptosis induction and dual EGFR/Topo-1 inhibition.

Novel differently substituted pyrazole derivatives were designed, synthesized and evaluated for their anticancer activity. All compounds selectively inhibited COX-2 enzyme (IC50 = 0.043-0.56 µM). Compounds 11, 12 and 15 showed superior potency (IC50 = 0.043-0.049 µM) and screened for their antiproliferative effect against MCF-7 and HT-29 cancer cell lines using doxorubicin and 5-FU as reference drugs. Compounds 11, 12 and 15 showed good potency against MCF-7 (IC50 = 2.85-23.99 µM) and HT-29 (IC50 = 2.12-69.37 µM) cell lines. Also, compounds 11, 12 and 15 displayed (IC50 = 56.61-115.75 µM) against non-cancerous WI-38 cells compared to doxorubicin (IC50 = 13.32 µM). Compound 11 showed superior cytotoxicity against both MCF-7 (IC50 = 2.85) and HT-29 (IC50 = 2.12 µM) and was more potent than 5-FU (HT-29: IC50 = 8.77 µM). Besides, it displayed IC50 of 115.75 µM against normal WI-38 cells regarding it as a safe cytotoxic agent. In addition, compound 11 displayed IC50 values of 63.44 µM and 98.60 µM against resistant HT-29 and resistant MCF-7 cancer cell lines sequentially. The most potent compound arrested cell cycle at G1/S phase in HT-29 treated cells displaying accumulation of cells in G0 phase and increase in percentage of cells in both early and late apoptotic stages. Apoptotic induction ability was confirmed via up-regulation of BAX, down-regulation of Bcl-2 and activation of caspase-3/9 protein levels. Compound 11 inhibited both EGFR (IC50 = 0.083 µM) and Topo-1 (IC50 = 0.020 µM) enzymes. Also, compound 11 decreased both total and phosphorylated EGFR concentration in HT-29 cells. Finally, molecular docking study showed good binding interactions between novel compounds and target receptors.

Characterization of novel heterocyclic compounds based on 4-aryl-4H-chromene scaffold as anticancer agents: Design, synthesis, antiprofilerative activity against resistant cancer cells, dual ß-tubulin/c-Src inhibition, cell cycle arrest and apoptosis induction.

In this study, three novel sets of 4-aryl-4H-chromene derivatives 4a-c, 6a-d and 7a-c were synthesized and evaluated for anticancer activity. Characterization of new compounds was established on basis of elemental analyses and spectral data. All new compounds were investigated for their antiproliferative activity against HCT-116, HepG-2 and MCF-7 cell lines using vinblastine and staurosporine as positive controls. Compounds 4b, 4c and 6d showed superior cytotoxicity against HCT-116, HepG-2 and MCF-7 cell lines, respectively with IC50 ranged from 3.31 to 4.95 µM. Additionally, compound 4b showed excellent cytotoxic activity (IC50 = 39.83 µM) against resistant HCT-116 better than doxorubicin (IC50 = 164.60 µM), while compounds 4c and 6d exhibited moderate cytotoxic activity against resistant HepG-2 and resistant MCF-7 cell lines. The most potent compounds inhibited both ß-tubulin polymerization (IC50 = 8.78 - 16.47 µM) and c-Src kinase (IC50 = 0.07 - 0.18 µM) enzymes. Compounds 4b, 4c and 6d activated caspase-3, caspase-7, and caspase-9 proteins relative to untreated cells, revealing apoptosis induction. Apoptosis was also confirmed through up-regulation of Bax and down-regulation of Bcl-2 protein expression levels. Cell cycle analysis of compound 6d showed accumulation of cells in pre-G1 phase and cell cycle arrest at S phase in MCF-7 treated cells. As well 6d caused 7- and 63- fold increase in apoptotic cell population at early and late apoptosis stages. Finally, molecular modeling study was performed to predict the binding pattern of the target compounds inside c-Src kinase receptor.

Synthesis of novel halogenated triarylpyrazoles as selective COX-2 inhibitors: Anti-inflammatory activity, histopatholgical profile and in-silico studies.

A novel series of halogenated triarylpyrazoles 12a-l was designed and synthesized. All target compounds showed good in vitro COX-2 inhibitory activity (IC50 = 0.043-0.17 µM) over COX-1 (IC50 = 7.8 - 15.4 µM) relative to celecoxib (COX-1/IC50 = 9.87, COX-2/IC50 = 0.055), with acceptable selectivity index values (SI = 50.6-253.1). Also, they displayed moderate to potent in vivo anti-inflammatory activity (% edema inhibition = 16.9-87.9) comparable to celecoxib (% edema inhibition = 46.6-72.1) as standard drug. Three fluorinated pyrazoles 12a, 12g and 12j, exhibited superior anti-inflammatory activity at all time intervals (% edema inhibition = 42.1-87.9) with better gastric profile (UI = 1.25-2.5) than the traditional NSAID; indomethacin (UI = 14) and were close to the selective COX-2 inhibitor; celecoxib (UI = 1.75). In-silico docking and ADME studies of 12a, 12g and 12j supported the obtained biological data and pointed out their potential use for the development of bio-available, safe and potent anti-inflammatory drugs.

Novel tetrazole-based selective COX-2 inhibitors: Design, synthesis, anti-inflammatory activity, evaluation of PGE2, TNF-α, IL-6 and histopathological study.

To search for effective and selective COX-2 inhibitors, four novel series of tetrazole derivatives were designed based on bioisosteric replacement of SO2NH2 in celecoxib with tetrazole ring incorporating different central moieties as chalcone (2a-f), isoxazole (3a-c) or pyrazole (4a-c & 5a-c). Target tetrazoles were synthesized and their structures were confirmed by spectroscopic techniques and elemental analyses. All target compounds were more selective for COX-2 isozyme than COX-1 when compared to standard drugs indomethacin and celecoxib. Compounds 3b, 3c, 4b, 4c, 5b and 5c exhibited potent in vitro COX-2 inhibitory activity (IC50 = 0.039-0.065 µM). Trimethoxy derivatives 3c, 4c and 5c acquired superior COX-2 selectivity index values (SI = 297.67-317.95) and were 1.1 fold higher than celecoxib (SI = 282.22). The most active six compounds were evaluated for their in vivo anti-inflammatory activity and serum levels of PGE2, TNF-α and IL-6 in addition to their ulcerogenic liability and histopathological profile. At a dose of 50 mg/Kg, compounds 3c and 5c showed better anti-inflammatory activity (% edema inhibition = 29.209-42.643) than celecoxib (% edema inhibition = 28.694-40.114) at different time intervals and were less ulcerogenic (UI = 0.123 and 0.11 in sequent) than celecoxib (UI = 0.167). Also, they displayed potent inhibitory effect on the production of PGE2 (% inhibition = 81.042 and 82.724 in sequent) greater than celecoxib (% inhibition = 79.666). Compound 5c decreased rat serum concentrations of both TNF-α (% inhibition = 55.349) and IL-6 (% inhibition = 61.561) in a comparable or better activity to celecoxib as reference drug. Finally, docking poses of the most active compounds showed strong binding interactions and effective overall docking energy scores explaining their remarkable COX-2 inhibitory activity.

New pyrazole derivatives possessing amino/methanesulphonyl pharmacophore with good gastric safety profile: Design, synthesis, cyclooxygenase inhibition, anti-inflammatory activity and histopathological studies.

New series of pyrazole derivatives Va-c, VIa-c, VIIa-f, and VIII possessing amino/methanesulphonyl moiety as COX-2 pharmacophore were designed and synthesized. All compounds were evaluated for both in vitro COX inhibition and in vivo anti-inflammatory activities and all of them were more potent against COX-2 than COX-1 isozyme and showed good in vivo anti-inflammatory activity. Compounds Va, VIa, VIc and VIIa-c showed good COX-2 SI (246.8-353.8) in comparison with the COX-2 selective drug; celecoxib (326.7). Also, they showed good anti-inflammatory activity with edema inhibition (51-86 and 83-96%) relative to celecoxib (60.6 and 82.8%) after 3 and 5 h respectively. Additionally, these potent derivatives Va, VIa, VIc and VIIa-c were significantly less ulcerogenic (ulcer indexes = 0.7-2.0) than indomethacin (ulcer index = 21.3) and were of acceptable ulcerogenicity when compared with the non-ulcerogenic reference drug celecoxib (ulcer index = 1.3). The obtained ulcerogenic liability data revealed the gastric safety of these derivatives which was confirmed by the histopathological studies. Docking study was performed for all synthesized derivatives to explain their interaction with COX-2 receptor active site.

Design, synthesis of celecoxib-tolmetin drug hybrids as selective and potent COX-2 inhibitors.

Three novel series of diarylpyrazole 10b-d and triarylpyrazole derivatives 11a-d &12a-d were synthesized through Vilsmier-Haack condition. The structures of prepared compounds were determined through IR, 1H NMR, 13C NMR, Mass spectral and elemental analysis. Docking of the synthesized compounds over COX-2 active site ensure their selectivity. Moreover, the target compounds were evaluated for both in vitro and in vivo inhibitory activity. All compounds were more selective for COX-2 isozyme than COX-1 isozyme and with excellent anti-inflammatory activity. Compounds 11b, 11d and 12b showed the highest anti-inflammatory activity (67.4%, 62.7%, 61.4% respectively), lower ulcerogenic liability (UI = 2.00, 2.75, 3.25 respectively) than indomethacin (UI = 14) and comparable to celecoxib (UI = 1.75) which were confirmed from the histopatholgical study.

Design, synthesis, and screening of ortho-amino thiophene carboxamide derivatives on hepatocellular carcinomaas VEGFR-2Inhibitors.

In this work, design, synthesis, and screening of thiophene carboxamides 4-13 and 16-23 as dual vascular endothelial growth factor receptors (VEGFRs) and mitotic inhibitors was reported. All compounds were screened against two gastrointestinal solid cancer cells, HepG-2 and HCT-116 cell lines. The most active cytotoxic derivatives 5 and 21 displayed 2.3- and 1.7-fold higher cytotoxicity than Sorafenib against HepG-2 cells. Cell cycle and apoptosis analyses for compounds 5 and 21 showed cells accumulation in the sub-G1 phase, and cell cycle arrest at G2/M phase. The apoptotic inducing activities of compounds 5 and 21were correlated to the elevation of p53, increase in Bax/Bcl-2 ratio, and increase in caspase-3/7.Compounds 5 and 21 showed potent inhibition againstVEGFR-2 (IC50 = 0.59 and 1.29 µM) and ß-tubulin polymerization (73% and 86% inhibition at their IC50 values).Molecular docking was performed with VEGFR-2 and tubulin binding sites to explain the displayed inhibitory activities.

Design, synthesis of novel isoindoline hybrids as COX-2 inhibitors: Anti-inflammatory, analgesic activities and docking study.

A group of novel isoindoline hybrids incorporating oxime, hydrazone, pyrazole, chalcone or aminosulfonyl pharmacophores (9-14) was designed and characterized by spectral data and elemental analyses results. All newly synthesized compounds were evaluated as COX-2 inhibitors, anti-inflammatory and analgesic agents. Six hybrid derivatives (10b, 10c, 11a, 11d, 13, 14) were moderate COX-2 inhibitors (IC50 = 0.11-0.18 µM) close to standard celecoxib (IC50 = 0.09 µM). The most active compounds showed outstanding in vivo anti-inflammatory activity (% edema inhibition = 41.7-50, 1 h; 40.7-67.4, 3 h; 20-46.7, 6 h) better than reference drug diclofenac (% edema inhibition = 29.2, 1 h; 22.2, 3 h; 20, 6 h). Most compounds showed significant peripheral and/or central analgesic activity. The moderate selective COX-2 inhibitor; dimethoxychalcone 11d (SI = 103) displayed excellent anti-inflammatory activity (% edema inhibition = 45.8-59.3) and increased thermal pain threshold (50-92.85%) comparable to piroxicam (75%). Molecular docking studies have been established.

Design, synthesis, analgesic, anti-inflammatory activity of novel pyrazolones possessing aminosulfonyl pharmacophore as inhibitors of COX-2/5-LOX enzymes: Histopathological and docking studies.

A series of newly synthesized 4-aryl-hydrazonopyrazolones were designed and their structures were confirmed by spectral and elemental analyses. All synthesized compounds were evaluated for their in vitro COXs, 5-LOX inhibition, in vivo analgesic and anti-inflammatory activities. Compounds 5d, 5f and 5i were found to be the most potent COX-2/5-LOX inhibitors with superior COX-2 selectivity index values (SI = 5.29-5.69) to reference standard celecoxib (SI = 3.52). Four compounds; 5b, 5c, 5d and 5f showed excellent anti-inflammatory activity (% edema inhibition = 72.72-54.54%) and perfect ED50 values (ED50 = 0.044-0.104 mmol/kg) relative to celecoxib (ED50 = 0.032 mmol/kg). To explore the most active compounds, ulcerogenic effect on stomach in comparison with indomethacin and celecoxib in addition to histopathological investigations were performed. Compound 5f showed better gastric profile (UI = 2.33) than celecoxib (UI = 3.00). Also, 5f caused 50% increase in thermal pain threshold close to reference drug indomethacin (53.13%). Docking study of all the target compounds into COX-2 and 5-LOX active sites was performed to rational their anti-inflammatory activities.

Azole-hydrazone derivatives: Design, synthesis, in vitro biological evaluation, dual EGFR/HER2 inhibitory activity, cell cycle analysis and molecular docking study as anticancer agents.

In this research, three series of azole-hydrazone derivatives namely, benzimidazole, benzoxazole and benzothiazole were designed and synthesized. Their structures were confirmed by elemental analysis and spectroscopic techniques. Stereochemical configuration of the synthesized compounds (Z/E) was determined. The new derivatives were tested in vitro against both human breast adenocarcinoma (MCF-7) and human hepatic adenocarcinoma (HepG2) cell lines. The most active compounds 3h (IC50 = 0.067 µM against MCF-7) and 3l (IC50 = 0.027 µM against HepG2) were further tested for Epidermal Growth Factor Receptor (EGFR) inhibitory activity. The most active 3h on EGFR was then screened for HER2 and VEGFR enzymes. Caspase-3/9 protein level expression were measured for the two compounds 3h and 3l. Cell cycle analysis showed pre G1 apoptosis and cell cycle arrest at G2/M phase. Up-regulation of Bax and down-regulation of Bcl-2 protein expression level confirmed apoptosis. Molecular docking analysis was performed for all the synthesized compounds inside the active site of EGFR.

Pyrazole-hydrazone derivatives as anti-inflammatory agents: Design, synthesis, biological evaluation, COX-1,2/5-LOX inhibition and docking study.

A new series of pyrazole-hydrazone derivatives 4a-i were designed and synthesized, their chemical structures were confirmed by IR, 1H NMR, 13C NMR, MS spectral data and elemental analysis. IC50 values for all prepared compounds to inhibit COX-1, COX-2 and 5-LOX enzymes were determined in vitro. Compounds 4a (IC50=0.67µM) and 4b (IC50=0.58µM) showed better COX-2 inhibitory activity than celecoxib (IC50=0.87µM) with selectivity index (SI=8.41, 10.55 in sequent) relative to celecoxib (SI=8.85). Also, compound 4a and 4b exhibited superior inhibitory activity against 5-LOX (IC50=1.92, 2.31µM) higher than zileuton (IC50=2.43µM). All target pyrazoles were screened for their ability to reduce nitric oxide production in LPS stimulated peritoneal macrophages. Compounds 4a, 4b, 4f and 4i displayed concentration dependent reduction and were screened for in vivo anti-inflammatory activity using carrageenan-induced rat paw edema assay. Compound 4f showed the highest anti-inflammatory activity (% edema inhibition=15-20%) at all doses when compared to reference drug celecoxib (% edema inhibition=15.7-17.5%). Docking studies were carried out to investigate the interaction of target compounds with COX-2 enzyme active site.

Synthesis and Biological Evaluation of New Diarylpyrazole and Triarylimidazoline Derivatives as Selective COX-2 Inhibitors.

New series of diarylpyrazoles 8a-f and triarylimidazoline-5-ones 11a-g were synthesized and evaluated for their in vitro cyclooxygenase-1 (COX-1) and COX-2 inhibitory activity and in vivo anti-inflammatory activity. The synthesized compounds showed good selectivity for COX-2; compounds 8a, 8d, 8f, 11a, and 11c exhibited the highest COX-2 selectivity indexes (SI = 4.77-5.43) compared to the reference drug celecoxib (SI = 7.8). All compounds showed good in vivo anti-inflammatory activity, especially compounds 8a, 8f, 11c, and 11d, which also showed some similarities to the time interval pattern of celecoxib at all different time intervals (1, 3, and 6 h).

Synthesis, cyclooxygenase inhibition, anti-inflammatory evaluation and ulcerogenic liability of novel triarylpyrazoline derivatives as selective COX-2 inhibitors.

A new series of triarylpyrazoline derivatives 8a-p containing the most important COX-2 pharmacophore (SO2CH3 or/and SO2NH2) were synthesized by reaction of propen-1-one derivatives 6a-h with different phenyl hydrazine hydrochloride derivatives 7a-b in aqueous ethanol. All prepared compounds were evaluated for their in vitro COX-1/COX-2 inhibitory activity and the in vivo anti-inflammatory activity. All compounds were more selective for COX-2 isozyme than COX-1 isozyme and showed good in vivo anti-inflammatory activity. Compounds 8g, 8j and 8o showed the highest anti-inflammatory activity and were less ulcerogenic (Ulcer Index=6.85, 7.7, 5.92, respectively) than indomethacin (Ulcer Index=12.3) and comparable to celecoxib (Ulcer Index=4.85).