RESUMO
HPLC-MS analysis revealed the presence of an unreported peptide in the extract of the marine sponge Neopetrosia sp. Its structure was determined as a tripeptide, named neopetromin (1), composed of two tyrosine and one tryptophan residues with a heteroaromatic C-N cross-link between side chains. The absolute configuration of amino acids was determined using Marfey's method after ozonolysis and hydrolysis of 1. Compound 1 promoted vacuole fragmentation in an actin-independent manner in tobacco BY-2 cells.
Assuntos
Nicotiana , Poríferos , Vacúolos , Animais , Estrutura Molecular , Poríferos/química , Nicotiana/química , Vacúolos/efeitos dos fármacos , Peptídeos Cíclicos/química , Peptídeos Cíclicos/farmacologia , Biologia Marinha , Oligopeptídeos/química , Oligopeptídeos/farmacologia , Oligopeptídeos/isolamento & purificação , Cromatografia Líquida de Alta Pressão , Triptofano/química , Triptofano/farmacologiaRESUMO
LC-MS and molecular networking analyses of the extract of the marine sponge Psammocinia sp. indicated the presence of two new compounds with multiple halogens. LC-MS-guided isolation yielded cyclic peptides, cyclopsammocinamides A (1) and B (2), in an enantiomeric relationship to cyclocinamide A (3). Planar structures of 1 and 2 were elucidated by NMR and mass spectroscopic analyses and the absolute configurations of the amino acid residues were determined using Marfey's method with their acid hydrolysates. The sponge extract exhibited cytotoxicity and the bioassay-guided isolation afforded a dimeric dilactone macrolide, swinholide A, as the cytotoxic compound.
Assuntos
Poríferos , Animais , Poríferos/química , Peptídeos Cíclicos/farmacologia , Peptídeos Cíclicos/química , Estereoisomerismo , Cromatografia Líquida , Estrutura MolecularRESUMO
Natural products are important sources for drug development. Discovery of natural products that inhibit cell cycle progression significantly contributes to the progress of cancer biology and the development of new antitumor agents. In this study, cell cycle inhibitory activity was evaluated with our extract library of natural resources, including marine invertebrates, fungi, and bacteria, using HeLa/Fucci2 cells which allow classification of the cell cycle phases of living cells. Screening of the extract library revealed that the extract of the marine sponge Dactylospongia metachromia inhibited cell cycle progression at S/G2/M phases. Bioassay-guided fractionation afforded a new sesquiterpene quinone, neoisosmenospongine (1), and four known compounds, nakijiquinone I, N, and Q (2-4) and (-)-dictyoceratin-C (5). The chemical structure of 1 was elucidated by interpretating the NMR and mass spectroscopic data, and the absolute configuration was determined by comparison of the experimental and calculated ECD spectra. Fluorescent imaging of HeLa/Fucci2 cells revealed that 1-4 inhibited the cell cycle progression at S/G2/M phases. This study demonstrated that fluorescent image-based high-content screening using HeLa/Fucci2 cells is an effective approach for isolating cell cycle inhibitors from natural resources.
Assuntos
Antineoplásicos/farmacologia , Produtos Biológicos/farmacologia , Imagem Óptica , Poríferos/química , Quinonas/farmacologia , Sesquiterpenos/farmacologia , Animais , Antineoplásicos/química , Antineoplásicos/isolamento & purificação , Produtos Biológicos/química , Produtos Biológicos/isolamento & purificação , Ciclo Celular/efeitos dos fármacos , Proliferação de Células/efeitos dos fármacos , Sobrevivência Celular/efeitos dos fármacos , Relação Dose-Resposta a Droga , Avaliação Pré-Clínica de Medicamentos , Ensaios de Seleção de Medicamentos Antitumorais , Humanos , Estrutura Molecular , Quinonas/química , Quinonas/isolamento & purificação , Sesquiterpenos/química , Sesquiterpenos/isolamento & purificação , Relação Estrutura-Atividade , Células Tumorais CultivadasRESUMO
A new rearranged nitrogenous bisabolone-type sesquiterpene, halichonic acid B (1), was isolated from a marine sponge Axinyssa sp. together with halichonic acid (2) and (6R,7S)-7-amino-7,8-dihydro-α-bisabolene (3). The structure of 1 was determined by extensive NMR and MS analyses, revealing an unprecedented carbon framework, and its absolute configuration was elucidated by time-dependent density-functional theory (TDDFT)-based electronic circular dichroism (ECD) spectrum calculation. We propose that 1 and 2 may be biosynthesized in the same pathway, involving the reaction between farnesyl pyrophosphate and glycine, followed by cyclization.
Assuntos
Poríferos/química , Sesquiterpenos/química , Animais , Dicroísmo Circular , Teoria da Densidade Funcional , Conformação Molecular , Sesquiterpenos/isolamento & purificação , Fatores de TempoRESUMO
A new halicyclamine derivative, tetradehydrohalicyclamine B (1), was isolated from the marine sponge Acanthostrongylophora ingens, along with halicyclamine B (2) as proteasome inhibitors. Compound 1 is the second example found to have a pyridinium ring in the halicyclamine family. Although the relative configuration of 2 was previously determined by X-ray crystallographic analysis, here we determined the absolute configuration of 2 by ECD experiment. Compounds 1 and 2 inhibited the constitutive proteasome as well as the immunoproteasome. The inhibitory activities of 2 were 4- to 10-fold more potent than those of 1.
Assuntos
Depsipeptídeos/farmacologia , Poríferos/química , Complexo de Endopeptidases do Proteassoma/metabolismo , Inibidores de Proteassoma/farmacologia , Animais , Cristalografia por Raios X , Depsipeptídeos/química , Depsipeptídeos/isolamento & purificação , Relação Dose-Resposta a Droga , Modelos Moleculares , Estrutura Molecular , Inibidores de Proteassoma/química , Inibidores de Proteassoma/isolamento & purificação , Relação Estrutura-AtividadeRESUMO
Four new sesquiterpenes, lamellodysidines A and B, O,O-dimethyllingshuiolide A, and 11-epi-O,O-dimethyllingshuiolide A (1-4), were obtained from the marine sponge, Lamellodysidea herbacea, collected in Indonesia. Their planar structures were elucidated by analysis of spectroscopic data. The absolute configurations of the new compounds were determined by the calculated ECD spectra. Compound 1 has a unique carbon framework, and 2 is a new nitrogenous sesquiterpene.
Assuntos
Poríferos/química , Sesquiterpenos/isolamento & purificação , Animais , Indonésia , Estrutura Molecular , Sesquiterpenos/químicaRESUMO
Three new furanosesterterpene tetronic acids, sulawesins A-C (1-3), were isolated from a Psammocinia sp. marine sponge, along with the known compounds ircinins-1 (4) and -2 (5). Although ircinins-1 and -2 were previously isolated as (+)- or (-)-enantiomers from marine sponges, we isolated them as enantiomeric mixtures. Sulawesins A and B possess a new carbon skeleton with a 5-(furan-3-yl)-4-hydroxycyclopent-2-enone moiety and were also found to be diastereomeric mixtures of four isomers by an HPLC analysis with a chiral-phase column. Sulawesin C has a dimeric structure of ircinin-1 and is the first dimer in this family. USP7, a deubiquitinating enzyme, is an emergent target of cancer therapy, and the isolated compounds inhibited USP7 with IC50 values in the range of 2.7-4.6 µM.
Assuntos
Furanos/isolamento & purificação , Furanos/farmacologia , Poríferos/química , Sesterterpenos/isolamento & purificação , Sesterterpenos/farmacologia , Terpenos/isolamento & purificação , Terpenos/farmacologia , Animais , Relação Dose-Resposta a Droga , Ensaios de Seleção de Medicamentos Antitumorais , Furanos/química , Humanos , Indonésia , Concentração Inibidora 50 , Biologia Marinha , Estrutura Molecular , Sesquiterpenos , Sesterterpenos/química , Estereoisomerismo , Relação Estrutura-Atividade , Terpenos/química , Ubiquitina Tiolesterase , Peptidase 7 Específica de UbiquitinaRESUMO
Six new spongian diterpene derivatives, ceylonins A-F (1-6), were isolated from the Indonesian marine sponge Spongia ceylonensis along with spongia-13(16),14-dien-19-oic acid (7). They contained three additional carbons in ring D to supply an ether-bridged bicyclic ring system. Their structures were elucidated by analyzing NMR spectroscopic data and calculated ECD spectra in comparison to experimental ECD spectra. The bicyclic ring system may be derived from the major metabolite 7 and a C3 unit (an acrylic acid equivalent) through an intermolecular Diels-Alder reaction, which was experimentally supported by the formation of 1-6 from 7 and acrylic acid. The inhibitory effects of the isolated compounds on the RANKL-induced formation of multinuclear osteoclasts in RAW264 macrophages were examined.
Assuntos
Diterpenos/isolamento & purificação , Diterpenos/farmacologia , Osteoclastos/efeitos dos fármacos , Poríferos/química , Ligante RANK/farmacologia , Animais , Diterpenos/química , Indonésia , Espectroscopia de Ressonância Magnética , Estrutura Molecular , Ressonância Magnética Nuclear Biomolecular , Osteoclastos/química , Ligante RANK/químicaRESUMO
Seven new spongian diterpenes, ceylonamides A-F (1-6) and 15α,16-dimethoxyspongi-13-en-19-oic acid (7), were isolated from the Indonesian marine sponge Spongia ceylonensis along with eight known spongian diterpenes, 8-15. Compounds 1-6 were determined to be nitrogenous spongian diterpenes. The isolated compounds were examined for the inhibition of RANKL-induced osteoclastogenesis in RAW264 macrophages. Ceylonamide A (1) exhibited the most potent inhibitory activity with an IC50 value of 13 µM, followed by ceylonamide B (2) (IC50, 18 µM). An examination of the structure-activity relationships of the isolated compounds revealed that the position of the carbonyl group of the γ-lactam ring and bulkiness of the substituent at its nitrogen atom were important for inhibitory activity.
Assuntos
Diterpenos/isolamento & purificação , Macrófagos/efeitos dos fármacos , Osteogênese/efeitos dos fármacos , Poríferos/química , Ligante RANK/farmacologia , Animais , Diterpenos/química , Diterpenos/farmacologia , Biologia Marinha , Camundongos , Estrutura Molecular , Ressonância Magnética Nuclear Biomolecular , Células RAW 264.7 , Relação Estrutura-AtividadeRESUMO
Two unique sesterterpenes, hyattellactones A (1) and B (2), together with two known sesterterpenes, phyllofolactones F (3) and G (4), were isolated from the Indonesian marine sponge Hyattella sp. The structures of the two new compounds, 1 and 2 were assigned based on their spectroscopic data. Hyattellactone A (1) was a scalarane sesterterpene with an α,ß-unsaturated-γ-lactone ring and C-ethyl group, while B (2) was an epimer of 1 at the C-24 position. Compounds 1 and 3 inhibited PTP1B activity with IC50 values of 7.45 and 7.47µM, respectively. On the other hand, compounds 2 and 4 (24S-isomers of 1 and 3, respectively) showed much reduced activity than the 24R-isomers.
Assuntos
Inibidores Enzimáticos/isolamento & purificação , Inibidores Enzimáticos/farmacologia , Lactonas/isolamento & purificação , Lactonas/farmacologia , Poríferos/química , Proteínas Tirosina Fosfatases/antagonistas & inibidores , Animais , Dicroísmo Circular , Inibidores Enzimáticos/química , Lactonas/químicaRESUMO
The formation of foam cells in macrophages has been suggested to play an essential role in the progression of early atherosclerotic lesions in vivo and, thus, its suppression is considered to be one of the major approaches for the treatment of atherosclerosis. We isolated eight brominated-tyrosine derivatives, bastadins, from the EtOH extract of the marine sponge Ianthella vasta as inhibitors of the formation of foam cells induced by acetylated low-density lipoproteins in human monocyte-derived macrophages. Bastadin 6 was the strongest inhibitor of foam cell formation due to its suppression of acyl-coenzyme A:cholesterol acyltransferase.
Assuntos
Ésteres do Colesterol/metabolismo , Células Espumosas/efeitos dos fármacos , Éteres Difenil Halogenados/farmacologia , Tirosina/farmacologia , Animais , Aterosclerose/tratamento farmacológico , Células CHO , Cricetulus , Ativação Enzimática/efeitos dos fármacos , Etanol/química , Células Espumosas/enzimologia , Halogenação , Humanos , Esterol O-Aciltransferase/antagonistas & inibidores , Tirosina/químicaRESUMO
Two new strongylophorine derivatives, along with six known strongylophorines, were isolated from the marine sponge Petrosia corticata as proteasome inhibitors. Of these, a hemiacetal mixture of strongylophorines-13/-14 was the strongest inhibitor of the proteasome with an IC50 of 2.1µM.
Assuntos
Diterpenos/química , Diterpenos/farmacologia , Petrosia/química , Inibidores de Proteassoma/química , Inibidores de Proteassoma/farmacologia , Animais , Antineoplásicos/química , Antineoplásicos/isolamento & purificação , Antineoplásicos/farmacologia , Diterpenos/isolamento & purificação , Avaliação Pré-Clínica de Medicamentos , Humanos , Espectroscopia de Ressonância Magnética , Inibidores de Proteassoma/isolamento & purificação , Espectrometria de Massas de Bombardeamento Rápido de Átomos , Relação Estrutura-AtividadeRESUMO
Two new merosesquiterpenes, verruculides A (1) and B (2), were isolated from a culture broth of the Indonesian ascidian-derived Penicillium verruculosum TPU1311, together with three known congeners, chrodrimanins A (3), B (4), and H (5). The structures of 1 and 2 were assigned on the basis of their spectroscopic data (1D and 2D NMR, HRMS, UV, CD, and IR). Compound 2 had a linear sesquiterpene moiety and was considered to be the derivative of the biosynthetic precursor for 1 and 3-5. Compounds 1, 3, and 5 inhibited the activity of protein tyrosine phosphatase 1B (PTP1B) with IC50 values of 8.4, 8.5, and 14.9 µM, respectively. Compound 2 showed 40% inhibition at 23.1 µM, while 4 was not active at 20.7 µM.
Assuntos
Inibidores Enzimáticos/química , Penicillium/química , Proteína Tirosina Fosfatase não Receptora Tipo 1/antagonistas & inibidores , Sesquiterpenos/química , Urocordados/microbiologia , Animais , Inibidores Enzimáticos/isolamento & purificação , Indonésia , Espectroscopia de Ressonância Magnética , Conformação Molecular , Penicillium/metabolismo , Proteína Tirosina Fosfatase não Receptora Tipo 1/metabolismo , Sesquiterpenos/isolamento & purificaçãoRESUMO
Halenaquinone was isolated from the marine sponge Petrosia alfiani as an inhibitor of osteoclastogenic differentiation of murine RAW264 cells. It inhibited the RANKL (receptor activator of nuclear factor-κB ligand)-induced upregulation of TRAP (tartrate-resistant acid phosphatase) activity as well as the formation of multinuclear osteoclasts. In addition, halenaquinone substantially suppressed RANKL-induced IκB degradation and Akt phosphorylation. Thus, these results suggest that halenaquinone inhibits RANKL-induced osteoclastogenesis at least by suppressing the NF-κB and Akt signaling pathways.
Assuntos
Quinonas/química , Animais , Diferenciação Celular/efeitos dos fármacos , Linhagem Celular , Proteínas I-kappa B/metabolismo , Camundongos , Osteoclastos/citologia , Osteoclastos/efeitos dos fármacos , Osteoclastos/metabolismo , Osteogênese/efeitos dos fármacos , Petrosia/química , Petrosia/metabolismo , Fosforilação/efeitos dos fármacos , Proteínas Proto-Oncogênicas c-akt/metabolismo , Quinonas/isolamento & purificação , Quinonas/farmacologia , Ligante RANK/toxicidade , Transdução de Sinais/efeitos dos fármacosRESUMO
Two new manzamine alkaloids, acantholactam (3) and pre-neo-kauluamine (4), were isolated from the marine sponge Acanthostrongylophora ingens along with manzamine A (1) and neo-kauluamine (2). Acantholactam contains a γ-lactam ring N-substituted with a (Z)-2-hexenoic acid moiety and is proposed to be biosynthetically derived from manzamine A by oxidative cleavage of the eight-membered ring. Compound 4 was converted to the dimer 2 during storage, suggesting nonenzymatic dimer formation. Among the four isolated compounds, 1, 2, and 4 showed proteasome inhibitory activity.
Assuntos
Alcaloides/isolamento & purificação , Carbazóis/isolamento & purificação , Poríferos/química , Inibidores de Proteases/isolamento & purificação , Alcaloides/química , Alcaloides/farmacologia , Animais , Carbazóis/química , Carbazóis/farmacologia , Carbolinas , Indonésia , Macrófagos/efeitos dos fármacos , Biologia Marinha , Estrutura Molecular , Ressonância Magnética Nuclear Biomolecular , Oceanos e Mares , Inibidores de Proteases/química , Inibidores de Proteases/farmacologiaRESUMO
USP7, a deubiquitylating enzyme hydrolyzing the isopeptide bond at the C-terminus of ubiquitin, is an emerging cancer target. We isolated spongiacidin C from the marine sponge Stylissa massa as the first USP7 inhibitor from a natural source. This compound inhibited USP7 most strongly with an IC50 of 3.8 µM among several USP family members tested.
Assuntos
Poríferos/química , Inibidores de Proteases/farmacologia , Pirróis/farmacologia , Ubiquitina Tiolesterase/antagonistas & inibidores , Animais , Relação Dose-Resposta a Droga , Humanos , Estrutura Molecular , Inibidores de Proteases/química , Pirróis/química , Pirróis/isolamento & purificação , Relação Estrutura-Atividade , Ubiquitina Tiolesterase/metabolismo , Peptidase 7 Específica de UbiquitinaRESUMO
The formation of foam cells in macrophages plays an essential role in the progression of early atherosclerotic lesions and therefore its prevention is considered to be a promising target for the treatment of atherosclerosis. We found that an extract of the marine sponge Acanthostrongylophora ingens inhibited the foam cell formation induced by acetylated low-density lipoprotein (AcLDL) in human monocyte-derived macrophages, as measured based on the accumulation of cholesterol ester (CE). Bioassay-guided purification of inhibitors from the extract afforded manzamines. Manzamine A was the most potent inhibitor of foam cell formation, and also suppressed CE formation in Chinese hamster ovary cells overexpressing acyl-CoA:cholesterol acyl-transferase (ACAT)-1 or ACAT-2. In addition, manzamine A inhibited ACAT activity. Next, we orally administered manzamine A to apolipoprotein E (apoE)-deficient mice for 80 days, and found that total cholesterol, free cholesterol, LDL-cholesterol, and triglyceride levels in serum were significantly reduced and the area of atherosclerotic lesions in the aortic sinus was also substantially diminished. These findings clearly suggest that manzamine A suppresses hyperlipidemia and atherosclerosis in apoE-deficient mice by inhibiting ACAT and is therefore a promising lead compound in the prevention or treatment of atherosclerosis. Although manzamine A has been reported to show several biological activities, this is the first report of a suppressive effect of manzamine A on atherosclerosis in vivo.
Assuntos
Alcaloides/uso terapêutico , Aterosclerose/prevenção & controle , Carbazóis/uso terapêutico , Ésteres do Colesterol/metabolismo , Hiperlipidemias/prevenção & controle , Macrófagos/efeitos dos fármacos , Alcaloides/química , Alcaloides/isolamento & purificação , Animais , Aterosclerose/sangue , Células CHO , Carbazóis/química , Carbazóis/isolamento & purificação , Células Cultivadas , Colesterol/sangue , Cricetinae , Cricetulus , Células Espumosas/efeitos dos fármacos , Células Espumosas/metabolismo , Humanos , Hiperlipidemias/sangue , Lipoproteínas LDL/metabolismo , Macrófagos/metabolismo , Camundongos , Camundongos Endogâmicos C57BL , Poríferos/química , Esterol O-Aciltransferase/metabolismo , Esterol O-Aciltransferase 2RESUMO
Six undescribed chlorinated sesquiterpene carbamates, aaptocarbamates A-F, and a chlorinated tris-norsesquiterpene carbamate, aaptocarbamate G, were isolated from the marine sponge Aaptos sp. collected in Indonesia. Aaptocarbamates D-F and G possess tetrahydrofurans and a tetrahydrofuranone, respectively. The relative configurations of the tetrahydrofuran units were determined by the NOE correlations and DFT-based calculation of the 13C chemical shifts. This is the first time that chlorinated terpene carbamates have been reported from natural sources. Various aaptamine derivatives have been reported from the Aaptos sponges so far, the isolation of chlorinated terpene carbamates is very rare. Aaptocarbamates A, B, and D showed 60% inhibition of the RANKL-induced formation of multinucleated osteoclasts in RAW264 macrophages at 20 µM.
Assuntos
Poríferos , Terpenos , Animais , Terpenos/farmacologia , Carbamatos/farmacologiaRESUMO
Hyrtioreticulins A-E (1-5) were isolated from the marine sponge Hyrtios reticulatus, along with a known alkaloid, hyrtioerectine B (6). Structural elucidation on the basis of spectral data showed that 1, 2, and 5 are new tetrahydro-ß-carboline alkaloids, while 3 and 4 are new azepinoindole-type alkaloids. Hyrtioreticulins A and B (1 and 2) inhibited ubiquitin-activating enzyme (E1) with IC(50) values of 0.75 and 11µg/mL, respectively, measured by their inhibitory abilities against the formation of an E1-ubiquitin intermediate. So far, only five E1 inhibitors, panapophenanthrine, himeic acid A, largazole, and hyrtioreticulins A and B (1 and 2), have been isolated from natural sources and, among them, 1 is the most potent E1 inhibitor.
Assuntos
Inibidores Enzimáticos/química , Alcaloides Indólicos/química , Poríferos/química , Enzimas Ativadoras de Ubiquitina/antagonistas & inibidores , Animais , Inibidores Enzimáticos/isolamento & purificação , Inibidores Enzimáticos/metabolismo , Alcaloides Indólicos/isolamento & purificação , Alcaloides Indólicos/metabolismo , Espectroscopia de Ressonância Magnética , Conformação Molecular , Enzimas Ativadoras de Ubiquitina/metabolismoRESUMO
Two new dimeric sterols, manadosterols A (1) and B (2), were isolated from the marine sponge Lissodendryx fibrosa collected in Indonesia. The two compounds are comprised of two sulfonated sterol cores connected through the respective side chains. Manadosterols A (1) and B (2) inhibited the Ubc13-Uev1A interaction with IC(50) values of 0.09 and 0.13 µM, respectively. They are the second and third natural compounds showing inhibitory activities against the Ubc13-Uev1A interaction and are more potent than leucettamol A (IC(50), 106 µM), the first such inhibitor, isolated from another marine sponge.