Composition and in vitro cytotoxic activities of essential oil of Hedychium spicatum from different geographical regions of western Himalaya by principal components analysis

The rhizome of Hedychium spicatum has been widely used in traditional medicines. The present study deals with the evaluation of the cytotoxic potential of rhizome essential oils from four different regions of the Western Himalaya (India) along with comparative correlation analysis to characterise the bioactive cytotoxic component. The essential oils were coded as MHS-1, MHS-2, MHS-3 and MHS-4, and characterised using GC-FID and GC–MS. The main volatile compounds identified were 1,8-cineol, eudesmol, cubenol, spathulenol and α-cadinol. In vitro cytotoxic activities were assessed against human cancer cell lines such as, the lung (A549), colon (DLD-1, SW 620), breast (MCF-7, MDA-MB-231), head and neck (FaDu), and cervix (HeLa). MHS-4 is significantly active in comparison to other samples against all cancer cell lines. Sample MHS-4 has major proportion of monoterpene alcohol mainly 1,8-cineol. Principal components analysis was performed for the experimental results and all four samples were clustered according to their percentage inhibition at different doses.     

Synthesis and antitumor activities of novel 1,4-substituted phthalazine derivatives

<正>A series of 1,4-substituted phthalazine derivatives were designed and synthesized.All the prepared compounds were screened for their cytotoxic activities against A549.HT-29 and MDA-MB-231 cell lines in vitro.Among them,compounds 7a-7h showed excellent selectivity for MDA-MB-231 cell line with IC_(50) values from 1 nmol/L to 0.92μmol/L.A preliminary SAR study of these derivatives was performed.     

Design and synthesis of novel 7-[(N-substituted-thioureidopiperazinyl)-methyl]-camptothecin derivatives as potential cytotoxic agents

Abstract

As part of continuing our research on diverse C-7 derivatives of camptothecin (CPT), 16 CPT derivatives bearing piperazinyl-thiourea chemical scaffold and different substituent groups have been designed, synthesized and evaluated in vitro for cytotoxicity against five tumor cell lines (A-549, MDA-MB-231, MCF-7, KB and KBvin). As a result, all the synthesized compounds showed promising in vitro cytotoxic activity against the five tumor cell lines tested, and were more potent than irinotecan. Importantly, compounds 13?g (IC₅₀ = 0.514?μM) and 13o (IC₅₀ = 0.275?μM) possessed similar or better antiproliferative activity against the multidrug-resistant (MDR) KBvin subline than that of topotecan (IC₅₀ = 0.511?μM) and merit further development as anticancer candidates for clinical trail. With these results in hand, we have a reason to conclude that incorporating piperazinyl-thiourea motifs into position-7 of camptothecin confers well cytotoxic activity against cancer cell lines, probably resulting in new anticancer drugs.     

Synthesis and biological evaluation of new pyrrolopyrazinone compounds as potential antitumor agents

A series of pyrrolo[1,2-a]pyrazinone compounds(5a-9f) were synthesized,and their cytotoxic activity against SKOV-3,A549.HeLa cells in vitro were evaluated by the MTT method.Some of the compounds showed potential antitumor activity against three tumor cell lines.Among them,compounds 9c and 9d showed the most potent cytotoxic activity.The preliminary mechanism of action was discussed.     

Synthesis and investigation of cytotoxicity of new N- and S,S-substituted-1,4-naphthoquinone (1,4-NQ) derivatives on selected cancer lines

1,4-Naphthoquinones (1,4-NQ) have been reported to possess a variety of pharma-cological properties including antibacterial, antifungal, antiviral, anti-inflammatory, anti-artherosclerotic, and anticancer effects. In this study, new N- and S,S-substituted-1,4-NQ derivatives were synthesized in excellent yields and were completely characterized by spectroscopic analysis IR, NMR (¹H and ¹³C), MS and microanalysis. The cytotoxic activities of 1,4-NQ derivatives were examined against to A-549, DU145, HCT-116 and MDA-MB-231 cancer cells. Among these compounds, 2-[4-(2-furoyl)piperazine-1-yl]-3-chloro-1,4-NQ 5 and 2,3-bis(cyclobuthylsulfanyl)-1,4-NQ 17 were identified as the most potent anticancer agents with cytotoxic activity against three cell lines (breast (MDA-MB-231), prostate (DU145), colorectal (HCT-116).     

Antiproliferative activities of 2-hydroxyethyl substituted benzimidazolium salts and their palladium complexes against human cancerous cell lines

Abstract

Benzimidazolium salts (1a and 1b) and respective palladium complexes (2a and 2b) were prepared and characterized with ¹H and ¹³C NMR, IR, elemental analysis as well as HRMS (for 2a). All target compounds were screened as potential anticancer agents against human cell lines for assessing their cytotoxicity. Heterocyclic organic compounds (1a and 1b) showed more cytotoxic activity than their complexes (2a and 2b) in the tested two cell lines. Particularly, a benzimidazolium salt including a 4-methylbenzyl group had a high cytotoxic potency towards MDA-MB-231 and DLD-1 cell lines with IC₅₀ values comparable to a well-known anticancer drug cisplatin, which is generally used in clinical studies. Furthermore, a compound namely 1-(2-hydroxyethyl)-3-(2,3,4,5,6-pentamethylbenzyl)-1H-benzo[d]imidazol-3-ium bromide was found to be more cytotoxic activity in MDA-MB-231 cell line compared to cisplatin with following IC₅₀ value of 7.59?±?0.68?μM.     

Three new phenanthrenes from Cremastra appendiculata (D. Don) Makino

Three new phenanthrenes,along with one known phenanthrene,were isolated from the ethanolic extract of the tubers of Cremastra appendiculata(D.Don) Makino.Their structures were elucidated on the basis of extensive spectroscopic analysis.Compounds 1-4 were tested for in vitro cytotoxic activities against human lung(A549),colon(HCT-116),liver(HepG2),and breast(MCF-7 and MDA-MB-231) cancer cell lines.     

Synthesis,characterization, and biological evaluation of new heterocyclic systems 1, 2, 3-triazole-isoxazoline from eugenol by the mixed condensation reactions

Abstract

We report the synthesis of new series of heterocyclic systems eugenol 1 derivatives by the mixed condensation reaction of 1,3-dipolar azide and the oxide of p-chlorophenylnitrile on the 4-allyl-2-methoxy-1-(prop-2-yn-1-yloxy)benzene 2. The mono and bicycloadducts, whose structure is homologous to compounds having a broad spectrum of activity, were obtained in good yields. The monocondensation reaction of azides on 4-allyl-2-methoxy-1-(prop-2-yn-1-yloxy)benzene 2 is completely chemoselective, regioselective and stereospecific. The condensation of nitrile oxide on 1,2,3-triazole monocycloadducts prepared was chemoselective and regioselective. The structure of all cycloadducts were characterized and confirmed by the ¹H, ¹³C, 2D nuclear magnetic resonance and mass spectrometry analysis. All the newly synthesized mono and bis-heterocyclic compounds have been selected for their antiproliferative activity against HT-1080 fibrosarcoma, A549 lung carcinoma, and MCF-7 and MDA-MB-231 breast carcinoma cell lines. Among the derivatives, only the compounds 4a, 4b, 5a, 5b, 5d, 5e and 5g showed significant cytotoxicity with IC₅₀ values ranging from 15.31 to 18.81?µM against HT-1080 cells, and 17.32 to 25.94?µM against the other cell lines.     

Synthesis,anticancer activity and molecular docking studies of novel pyrido[1,2-a]pyrimidin-4-one derivatives

A series of novel triazolothione, thiadiazole, triazole, and oxadiazole-functionalized pyrido[1,2-a]pyrimidin-4-ones 6a–6l and 7a–7f were prepared, starting from pyridine derivatives 1a and 1b. All the compounds 6a–6l and 7a–7f were screened against four human cancer cell lines (HeLa, COLO205, Hep G2, and MCF 7), among which compounds 6d, 6h, 6j, 7b, and 7e showed promising anticancer activity. Molecular docking studies showed good binding energy and exhibited interactions and better lower free energy values, indicating more thermodynamically favored interaction.     

Synthesis,cytotoxicity, apoptosis and molecular docking studies of novel phenylbutyrate derivatives as potential anticancer agents

Phenylbutyrate (PB), a small aromatic fatty acid, has been known as an interesting compound with the ability of anti-proliferation and cell growth inhibition in cancer cells. In the present study, a series of PB derivatives were synthesized by Passerini multicomponent reaction and their cytotoxic activities against various human cancer cell lines including A549 (non-small cell lung cancer), MDA-MB-231 (breast cancer), and SW1116 (colon cancer) were evaluated. The results revealed that B9, displayed significantly higher in vitro cytotoxicity with IC₅₀ of 6.65, 8.44 and 24.71 μM, against A549, MDA-MB-231 and, SW1116, respectively, in comparison to PB. The effects of these compounds on the proliferation of MCF-10A as non-tumoral breast cell line, showed good selectivity of the compounds between tumorigenic and non-tumorigenic cell lines. Moreover, B9 has indicated apoptosis-inducing activities to MDA-MB-231 cancer cell line in a dose-dependent manner. The molecular docking studies of the synthesized compounds on pyruvate dehydrogenase kinase 2 (PDK2; PDB ID: 2BU8) and histone deacetylase complex (HDAC; PDB ID: 1C3R), as the main targets of PB were applied to predict the binding sites and binding orientation of the compounds to these targets.     

Synthesis and Anticancer Activity of 1,2,3-Triazole Fused N-Arylpyrazole Derivatives

A novel series of triazole derivatives 11a–11j is synthesized. Structures of the products are confirmed by ¹H and ¹³C NMR, and mass spectral data. The anticancer activities of compounds 11a–11j are evaluated against three human cancer cell lines (MCF-7, A549, and A375) using the standard MTT assay in vitro, using doxorubicin as the positive control. All the compounds exhibit significant activity against cancer cell lines. The compounds 11a, 11d, 11e, 11g, and 11j demonstrate more potent activity than the positive control.

     

The cytotoxic activities of imidazole derivatives prepared from various guanylhydrazone and phenylglyoxal monohydrate

Abstract

A series of imidazole derivatives were synthesized from two-component condensation reaction of phenylgloxal monohydrate with guanylhydrazone. They were characterized by spectroscopic and analytical techniques. The in vitro anticancer evaluation of these compounds was done on human breast cancer (MCF-7) and human liver cancer (HepG2) cell lines using the MTT assay method. Most of the newly synthesized compounds displayed cytotoxic activity against these cancerous cells. In fact, compounds 3a, 3e, and 3?h exhibited more cytotoxic activities than the positive control drugs, fluro-5, and irinocam, against the MCF-7 cell line. Almost all the compounds, except for three, 3b, 3d, and 3f, gave more cytotoxic results than cisplatin. Therefore, these compounds could be considered for further development as anticancer drug candidates.     

Synthesis,characterization and biological evaluation of purine nucleoside analogues

We present a convenient route for the synthesis of C6-amino-C5′-N-cyclopropyl carboxamido-C2-alkynylated purine nucleoside analogues 11a–g via Sonogashira coupling reaction. The nine step synthesis is easy to perform, employing commercially available reagents. Compound 9 is used as key intermediate for the synthesis of analogues 11a–g. Synthetic intermediates and final products are appropriately characterized by IR, ¹H NMR, ¹³C NMR and Mass. The modified nucleoside analogues 11a–g is evaluated for in vitro anticancer activity against MDA-MB-231 and Caco-2 cell lines. Screening data reveals that compounds 11b and 11e displayed potent IC₅₀ value of 7.9, 6.8 µg/mL respectively against MDA-MB-231 and of 7.5, 8.3 µg/mL respectively against Caco-2 than the standard drug doxorubicin, thus establishing the potential anti-cancer properties of these newer derivatives.     

New synthetic quinaldine conjugates: Assessment of their anti-cholinesterase,anti-tyrosinase and cytotoxic activities,and molecular docking analysis

Despite all the progress made to enrich the existing bank of drugs used to treat and cure Alzheimer and cancer patients, there is still a need to research and develop new bioactive candidates with superior efficacy but minimal side effects. In this context, a new series of anti-butyrylcholinesterase (anti-BChE), anti-tyrosinase and cytotoxic succinimide linked quinaldine conjugates 3a-i was designed and synthesized starting from 8-hydroxyquinaldine. The condensation of quinoleine-hydrazide 2 with electrophilic species such as aromatic and nonaromatic anhydrides provided the new compounds 3a-i. These synthesized heterocycles were characterized by spectroscopic means (¹H NMR, ¹³C NMR and ESI-HRMS). Their anti-butyrylcholinesterase, anti-tyrosinase and cytotoxic (cervical cancer cell (HeLa) and lung cancer cell (A549)) activities have been evaluated in vitro. Compounds 3e and 3 g were found to be more anti-BChE than Galanthamine. Compounds 3d, 3e and 3 g exerted better anti-tyrosinase activity than kojic acid. Also, 3a, 3f and 3 g showed interesting cytotoxic potential towards HeLa cell lines. These results were supported by the molecular docking analysis (structure–activity relationship (SAR)) to estimate and discuss possible interactions between these derivatives and active sites of proteins butyrylcholinesterase (PDB: 4B0P), tyrosinase (PDB: 2Y9X) and cytotoxic (topoisomerase IIα enzyme (PDB: 5GWK)).     

Synthesis and antitumor activity of new silver(I)-N-heterocyclic carbene complexes

Abstract

In this study, two novel benzimidazole-based N-heterocyclic carbene ligands (1a-b) and their silver(I) complexes (2a-b) were synthesized. All new compounds were characterized by FT-IR, LC-MS, ¹H NMR, and ¹³C NMR spectroscopies. The in vitro antitumor activities of NHC ligands (1a-b) and their silver(I) complexes (2a-b) against DU-145 human prostate cancer cells, MDA-MB-231 and MCF-7 human breast cancer cells and L-929 (normal cells adipose from mouse) were also determined using MTT analysis for 24?h, 48?h, and 72?h. The results showed that while NHC ligands did not have in vitro antitumor activity on MCF-7, MDA-MB-231 and DU-145 cells, Ag(I)-NHC complexes have in vitro antitumor activities. The in vitro antitumor activity of 2a was found to be lower than that of 2b. Ag(I)-NHC complexes were observed to have higher IC₅₀ values for non-cancerous cell lines than cancer cells.     

Synthesis,characterization, and cytotoxic activity studies of new N4O complexes derived from 2-({3-[2-morpholinoethylamino]-N3-([pyridine-2-yl]methyl) propylimino} methyl)phenol

A new unsymmetrical five-coordinate Schiff base ligand (HL) with an N₄O donor set ( 2 ) has been prepared by condensation of N1-(2-morpholinoethyl)-N1-([pyridine-2-yl]methyl)propane-1,3-diamine with 2-hydroxy-benzaldehyde. Metal complexes [ML]ⁿ⁺ (M = Zn²⁺, Cd²⁺, Mn²⁺, Cu²⁺, Ni²⁺, Ag⁺, Fe³⁺, and Co²⁺ ( 3–10 ) were synthesized by the reaction of the ligand and metal salts in ethanol. The resulting products were characterized by elemental analyses, infrared, ¹H and ¹³C nuclear magnetic resonance spectra (in the case of Cd and Zn complexes), UV–Vis, electrospray ionization-mass spectrometric, and conductivity measurements. The structure of the complexes [ZnL](ClO₄) ( 3 ), [CdL](ClO₄) ( 4 ), and [CuL](ClO₄) ( 7 ) has been determined by single-crystal X-ray diffraction analysis. The metal complexes were determined to have a distorted trigonal bipyramidal (Zn and Cd) or a distorted square pyramidal (Cu) geometry. The cytotoxic potential of each compound (1–10) against MCF-7 and MDA-MB-231 (breast cancer cells), PC-3 (prostate cancer cells), and WI-38 human normal lung fibroblast cells was evaluated using the MTT (3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyl tetrazolium bromide) assay. Compounds 1, 2, and 10 did not display any activity toward any cell line tested. None of the compounds except compound 8 was cytotoxic toward PC-3. Compounds 4 and 8 showed the highest cytotoxic activity against the MCF-7 and MDA-MB-231 cell lines. Because compounds 3, 6, and 9 have similar half-maximal inhibitory concentration values against cancer cells and normal cells, these compounds displayed poor selectivity between cancer and normal cells. More importantly, it was observed that compound 5 acts differently toward different types of cell lines. For example, it displays lower cytotoxicity against the WI-38 normal cell line than it does against the MDA-MB-231 cell line.     

Synthesis and cytotoxicity of 7,8-dihalopyrido[1,2-a]benzimidazole-6,9-dione and its 1,2,3,4-tetrahydro analogue

An efficient synthesis of 8-bromo-7-chloropyrido[1,2-a]-benzimidazole-6,9-dione and its 1,2,3,4-tetrahydro analogue from N-(4-chloro-2-nitrophenyl)pyridinium chloride has been accomplished. The study for antitumour activity against cancer cell lines such as A549, SH-SY5Y, Hep-2, HeLa and MCF-7 revealed that the cytotoxic effect of the compounds obtained was several times higher than that of Mitomycin C.     

Novel naphthalimide–indomethacin hybrids as potential antitumor agents: effects of linkers on hypoxic/oxic cytotoxicity and apoptosis-inducing activity

Abstract  

A series of novel naphthalimide–indomethacin hybrids with different linkers were designed and synthesized. Their antitumor activity was evaluated against HeLa, A549, P388, HL-60, MCF-7, HCT-8, and A375 cancer cell lines in vitro. Preliminary results showed that the hybrids had moderate cytotoxic activity with 50% inhibition concentration (IC ₅₀) values of ~10⁻⁵ M, and could effectively induce apoptosis in HeLa cells. More importantly, the amide derivatives had better cytotoxic and proapoptotic activity than their ester counterparts, whereas the ester derivatives had hypoxic preferred cytotoxicity and might be used as promising candidates of prodrug in hypoxic tumor cells. This work provides a novel class of naphthalimide–indomethacin hybrids with unique antitumor activity for further optimization.     

Design and synthesis of fluorescent symmetric bis-triazolylated-1,4-dihydropyridines as potent antibreast cancer agents

Herein, we report the synthesis of fluorescent 1,4-dihydropyridine-linked bis-triazoles (2a–2n) through Hantzsch synthesis by the condensation of o/m-chloro-substituted benzaldehyde, ethyl 3-oxo-4(prop-2-yn-1-yloxy)butanoate, and ammonium acetate in the presence of Ba(NO₃)₂ as a catalyst followed by the click reaction of resultant Hantzsch product (1) with various aromatic as well as aliphatic azides. All the synthesized compounds were well characterized by ¹H-NMR, ¹³C-NMR, FTIR, and HRMS spectral techniques. Antibreast cancer evaluation of all the synthesized derivatives revealed that the compounds 2f (IC₅₀?=?7?±?0.02?µM) and 2g (IC₅₀?=?5?±?0.03?µM) showed better anticancer activity (lower IC₅₀) than the standard drug tamoxifen (IC₅₀?=?11.2?±?0.01?µM) against breast carcinoma (MDA-MB-231) cell line. The synthesized compounds were also screened against normal human embryonic kidney (HEK-293) cell line and found to be nontoxic. The fluorescent nature and cytotoxicity assay of these newly synthesized hybrids recommend their utility in tumor cell imaging.     

Lasiodiplodins from mangrove endophytic fungus Lasiodiplodia sp. 318#

Four new lasiodiplodins (1–4), together with three known analogues, have been isolated from a mangrove endophytic fungus, Lasiodiplodia sp. 318#. Their structures were elucidated by spectroscopic techniques. Cytotoxic activities of compounds 1–7 were evaluated in vitro against human cancer lines THP1, MDA-MB-435, A549, HepG2 and HCT-116. Compound 4 exhibited moderate cytotoxic activities.