RESUMO
As our ongoing work, a novel series of the amide-based CA-4 analogues were successfully designed, synthesized, and explored for their biological evaluation. Among these compounds, 7d and 8a illustrated most potent antiproliferative activity toward A549, HeLa, HCT116, and HT-29 cell lines. Most importantly, these two compounds didn't display noticeable cytotoxic activity on the non-tumoural cell line HEK-293. Further mechanism studies revealed that analogue 8a was identified as a novel tubulin polymerization inhibitor with an IC50 value of 6.90 µM, which is comparable with CA-4. The subsequent investigations unveiled that analogue 8a not only effectively caused cell cycle arrest at the G2/M phase but also induced apoptosis in A549 cells via a concentration-dependent manner. The molecular docking revealed that 8a could occupy well the colchicine-binding site of tubulin. Collectively, these findings indicate that amide-based CA-4 scaffold could be worthy of further evaluation for development of novel tubulin inhibitors with improved safety profile.
Assuntos
Amidas , Antineoplásicos , Proliferação de Células , Desenho de Fármacos , Ensaios de Seleção de Medicamentos Antitumorais , Simulação de Acoplamento Molecular , Estilbenos , Moduladores de Tubulina , Tubulina (Proteína) , Humanos , Moduladores de Tubulina/farmacologia , Moduladores de Tubulina/síntese química , Moduladores de Tubulina/química , Tubulina (Proteína)/metabolismo , Relação Estrutura-Atividade , Amidas/química , Amidas/farmacologia , Amidas/síntese química , Proliferação de Células/efeitos dos fármacos , Estilbenos/química , Estilbenos/farmacologia , Estilbenos/síntese química , Antineoplásicos/farmacologia , Antineoplásicos/síntese química , Antineoplásicos/química , Apoptose/efeitos dos fármacos , Estrutura Molecular , Linhagem Celular Tumoral , Relação Dose-Resposta a Droga , Células HEK293RESUMO
Rhein is one of the anthraquinones components of Rheum. It shows excellent clinical efficacy and is widely used in the management of several disease conditions including tumors, inflammation, diabetic nephropathy, and viral infections. In this review, we summarize the recent studies on the pharmacological activities of rhein and its derivatives, as well as their association with different diseases and possible mechanisms based on our previous review. This review serves as an updated and a supplement to our previous report highlighting the use of rhein in nanotechnology. It also serves as a reference study and offers an overall picture of the use of rhein and its derivatives in nanotechnology.
Assuntos
Antraquinonas/uso terapêutico , Animais , Antraquinonas/efeitos adversos , Antraquinonas/química , Portadores de Fármacos , Composição de Medicamentos , Humanos , Nanomedicina , Nanopartículas , Polímeros/químicaRESUMO
Alzheimer's disease (AD), which is characterized by impairment of cognitive functions, is a chronic neurodegenerative disease that mainly affects the elderly. Currently available anti-AD drugs can only offer limited symptom-relieving effects. "One-compound-Multitargeted Strategy" have been recognized as the promising way to win the war against AD. Herein we report a potential anti-AD agent PT109 with multi-functions. First, an 81-kinase screening was carried out and results showed that PT109 potently inhibited c-Jun N-terminal kinases and Serum and glucocorticoid-inducible kinase 1, which are the important signaling molecules involved in neurogenesis, neuroprotection and neuroinflammation and mildly inhibit glycogen synthase kinase-3ß as well as protein kinase C gamma, both are involved in AD pathological processes. In addition, invitro studies of immunofluorescent staining and Western blot showed that PT109 might promote the neurogenesis of C17.2 cells and induce synaptogenesis in primary cultured rat hippocampal neurons. We detected and confirmed the neuroprotective effect of PT109 in cultured HT22 cells by MTT assay, dehydrogenase assay, glutathione assay and reactive oxygen species assay. Furthermore, the results of Western blot, ELISA assay and immunofluorescent staining indicated that PT109 attenuated lipopolysaccharide-induced inflammation in BV2 cells and primary astrocytes. The results of Morris water maze and Step-through test indicated that PT109 improved the spatial learning ability in APP/PS1 mice. More importantly, the invivo pharmacokinetic parameters indicated that PT109 had better medicinal properties. Taken together, our findings suggest that PT109 may be a promising candidate for treating AD through multiple targets although further studies are ought to be conducted.
Assuntos
Doença de Alzheimer/tratamento farmacológico , Encéfalo/efeitos dos fármacos , Descoberta de Drogas , Neurogênese/efeitos dos fármacos , Fármacos Neuroprotetores/farmacologia , Inibidores de Proteínas Quinases/farmacologia , Doença de Alzheimer/genética , Doença de Alzheimer/metabolismo , Doença de Alzheimer/patologia , Precursor de Proteína beta-Amiloide/genética , Animais , Astrócitos/efeitos dos fármacos , Astrócitos/metabolismo , Astrócitos/patologia , Comportamento Animal/efeitos dos fármacos , Encéfalo/metabolismo , Encéfalo/patologia , Linhagem Celular , Citocinas/metabolismo , Modelos Animais de Doenças , Proteínas Imediatamente Precoces/antagonistas & inibidores , Proteínas Imediatamente Precoces/metabolismo , Mediadores da Inflamação/metabolismo , Proteínas Quinases JNK Ativadas por Mitógeno/antagonistas & inibidores , Proteínas Quinases JNK Ativadas por Mitógeno/metabolismo , Locomoção/efeitos dos fármacos , Masculino , Camundongos Endogâmicos C57BL , Camundongos Transgênicos , Microglia/efeitos dos fármacos , Microglia/metabolismo , Microglia/patologia , Terapia de Alvo Molecular , Teste do Labirinto Aquático de Morris/efeitos dos fármacos , Neurônios/efeitos dos fármacos , Neurônios/metabolismo , Neurônios/patologia , Fármacos Neuroprotetores/farmacocinética , Presenilina-1/genética , Inibidores de Proteínas Quinases/farmacocinética , Proteínas Serina-Treonina Quinases/antagonistas & inibidores , Proteínas Serina-Treonina Quinases/metabolismo , Ratos Sprague-Dawley , Transdução de SinaisRESUMO
Glioblastoma multiforme (GBM) is the most common malignant tumor of the central nervous system (CNS). Effective treatments remain limited. Therefore, novel chemotherapy drugs with high efficiency and few adverse effects are urgently needed. Histone deacetylase (HDAC) and serum and glucocorticoid-regulated protein kinase 1 (SGK1) are targets for the prevention and treatment of GBM. Rhein has antitumor and SGK1 suppression effects, although its biological activity is limited by poor bioavailability. To improve the drug-like properties of rhein, we constructed a novel rhein-hydroxyethyl hydroxamic acid derivative (SYSUP007), which combined rhein with the HDAC inhibitor, suberoylanilide hydroxamic acid (SAHA). In the present study, the human GBM cell lines, T98G, U87 and U251, were used to investigate the anticancer effects of SYSUP007 in vitro. We found that SYSUP007 was more effective in inhibiting glioma cell proliferation, invasion and migration in vitro compared with the effects of rhein and SAHA. We also confirmed that SYSUP007 increased the expression of Ac-K100 and NDRG1 (targets of HDAC and SGK1). The present study indicates the potential that SYSUP007, as a novel rhein and SAHA derivative, for development as an anti-cancer therapy.
Assuntos
Antraquinonas/farmacologia , Antineoplásicos/farmacologia , Glioblastoma/tratamento farmacológico , Disponibilidade Biológica , Linhagem Celular Tumoral , Movimento Celular/efeitos dos fármacos , Proliferação de Células/efeitos dos fármacos , Glioblastoma/metabolismo , Glioma/tratamento farmacológico , Glioma/metabolismo , Inibidores de Histona Desacetilases/farmacologia , Histona Desacetilases/metabolismo , Humanos , Ácidos Hidroxâmicos/metabolismo , Proteínas Imediatamente Precoces/metabolismo , Invasividade Neoplásica/genética , Proteínas Serina-Treonina Quinases/metabolismo , Vorinostat/farmacologiaRESUMO
Niacin has been widely used as an antihyperlipidemic drug, but the flushing effect restricted its clinical application. Here, we developed novel niacin-lipoic acid dimers which lead to better lipid modulation, higher synergistic effects and less side effects. We utilized molecular docking simulation to design a novel series of niacin-lipoic acid dimers. The compound N-(2-(5-(1,2-dithiolan-3-yl)pentanamido)ethyl)nicotinamide (N2L) was selected for the in vitro and in vivo evaluation, including the agonist activity in CHO-hGPR109A cells, cell protective effects in HT22 and HUVECs cells, flushing effect in guinea pigs and rats, lipid modulation in C57BL/6 mice and high fat diet-rats and atherosclerotic lesions regulation in apolipoprotein E null mice. N2L worked as potent and selective agonists for the high affinity niacin receptor GPR109A. N2L retained antioxidation and cytoprotection of lipoic acid. In addition, N2L displayed a good therapeutic index regarding lipid modulation and atherosclerotic lesions regulation, and minimized niacin-induced vasodilation (flushing) effect in vivo. N2L showed effective treatment regarding to lipid regulation and atherosclerosis inhibition effects, also with excellent antioxidant effects, safety profiles and non-flushing. All these results suggest N2L promising application prospects in the drug development for the treatment of atherosclerosis.
Assuntos
Aterosclerose/tratamento farmacológico , Dislipidemias/tratamento farmacológico , Rubor/prevenção & controle , Hipolipemiantes/farmacologia , Animais , Aterosclerose/sangue , Aterosclerose/diagnóstico , Linhagem Celular , Cricetulus , Dimerização , Modelos Animais de Doenças , Desenho de Fármacos , Dislipidemias/sangue , Dislipidemias/diagnóstico , Feminino , Rubor/induzido quimicamente , Células Endoteliais da Veia Umbilical Humana , Humanos , Hipolipemiantes/química , Hipolipemiantes/uso terapêutico , Lipídeos/sangue , Masculino , Camundongos , Camundongos Knockout para ApoE , Simulação de Acoplamento Molecular , Niacina/química , Niacina/farmacologia , Niacina/uso terapêutico , Ratos , Ácido Tióctico/química , Ácido Tióctico/farmacologia , Ácido Tióctico/uso terapêuticoRESUMO
Glioblastoma multiforme (GBM) is the most malignant type of primary brain tumor in adults and can diffusely infiltrate adjacent normal tissue. GBM is therefore rarely cured by surgery or radiation therapy. Matrix metalloproteinases (MMPs) are involved in tissue remodeling and numerous other physiological progresses. The MMPs MMP-2 and MMP-9 are associated with the invasion ability of GBM. PT93 is a novel caffeic acid amide derivative that was first synthesized in 2013. In the present study, the human GBM T98G, U87 and U251 cell lines and the normal mouse neuron HT22 cell line were used to investigate the anticancer and cytotoxic effects of PT93 in vitro. The cytotoxicity of PT93 was measured using MTT and lactate dehydrogenase assays. The anti-proliferation effect was tested using a cell colony formation assay. Gelatin zymography analysis and a scratch test were used to investigate the anti-migration mechanism of PT93. Western blot analysis was used to measure the expression of MMP-2/-9. The experimental results showed that PT93 suppressed the proliferation of T98G cells, and showed cytotoxicity effects at high concentration in T98G, U87, U251 and HT22 cell lines. Furthermore, PT93 limited the migration ability of the cells and inhibited the extracellular MMP-2 and MMP-9 activity of T98G and U251 cells. Finally, the present study confirmed that PT93 affects the level of MMP-2/-9 expression in T98G cells in a concentration-dependent manner. The present study indicates that PT93, as a novel caffeic acid amide derivative, may be used in the treatment of GBM.
RESUMO
Microglia and astrocytes are largely responsible for inflammatory injury in the brain of Alzheimer's disease (AD). Increasing evidence has indicated that Rho kinase (ROCK) plays an important role in the regulation of neuroinflammation. Previously, we synthesized a new chemical entity L-F001 and proved its potential inhibitory effects on ROCK and oxidative stress. Here, we investigated the anti-inflammatory effects and the molecular mechanisms of L-F001 in vitro and in vivo. L-F001 remarkably suppressed lipopolysaccharides (LPS)-elevated expression of inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) as well as LPS-induced production of nitric oxide (NO), reactive oxygen species, interleukin-6 (IL-6) and tumor necreactive oxygen speciesis factor-α (TNF-α) in microglial BV-2 cells and in cultured astrocytes. Furthermore, L-F001 inhibited the degradation of IκB and nuclear translocation of nuclear factor kappa B (NF-κB) p65 subunit. Moreover, L-F001 induced the upregulation of heme-oxygenase-1 (HO-1) and glutamate cysteine ligase modifier subunit (GCLM) expression, two downstream effectors of nuclear factor (erythroid-derived 2)-like 2 (Nrf2). It was interesting that L-F001 also activated phosphatidylinositol 3-kinase (PI3K) pathway and induced M1 (CD16/32, M1 marker)/ M2 (CD206, M2 maker) transition in BV-2 cells which was significantly blocked by a PI3K inhibitor, wortmannin. Finally, L-F001 markedly attenuated the level of pro-inflammatory mediators in a murine model of systemic acute brain inflammation induced by LPS. Taken together, these results indicate that the novel multifunctional ROCK inhibitor L-F001 suppresses neuroinflammation in vitro and in vivo via NF-κB inhibition and Nrf2 activation, suggesting that L-F001 may be a promising drug candidate for treating neuroinflammation-associated CNS diseases, including AD.
Assuntos
Azepinas/farmacologia , Fator 2 Relacionado a NF-E2/metabolismo , NF-kappa B/antagonistas & inibidores , Inibidores de Proteínas Quinases/farmacologia , Sulfonamidas/farmacologia , Quinases Associadas a rho/antagonistas & inibidores , Transporte Ativo do Núcleo Celular/efeitos dos fármacos , Animais , Astrócitos/efeitos dos fármacos , Astrócitos/metabolismo , Azepinas/uso terapêutico , Linhagem Celular , Núcleo Celular/efeitos dos fármacos , Núcleo Celular/metabolismo , Sobrevivência Celular/efeitos dos fármacos , Ciclo-Oxigenase 2/metabolismo , Feminino , Regulação Enzimológica da Expressão Gênica/efeitos dos fármacos , Inflamação/tratamento farmacológico , Inflamação/metabolismo , Inflamação/patologia , Camundongos Endogâmicos C57BL , Microglia/efeitos dos fármacos , Microglia/metabolismo , Óxido Nítrico Sintase Tipo II/metabolismo , Fosfatidilinositol 3-Quinases/metabolismo , Inibidores de Proteínas Quinases/uso terapêutico , Transdução de Sinais/efeitos dos fármacos , Sulfonamidas/uso terapêutico , Fator de Transcrição RelA/metabolismoRESUMO
The microglia-mediated neuroinflammation plays an important role in the pathogenesis of Alzheimer's disease (AD). Advanced glycation end products (AGEs)/receptor for advanced glycation end products (RAGE) or Rho/Rho kinase (ROCK) are both involved in the development of non-specific inflammation. However, there are few reports about their effects on neuroinflammation. Here, we explored the mechanism of AGEs/RAGE/Rho/ROCK pathway underlying the non-specific inflammation and microglial polarization in BV2 cells. AGEs could activate ROCK pathway in a concentration-dependent manner. ROCK inhibitor fasudil and RAGE-specific blocker FPS-ZM1 significantly inhibited AGEs-mediated activation of BV2 cells and induction of reactive oxygen species (ROS). FPS-ZM1 and fasudil exerted their anti-inflammatory effects by downregulating inducible nitric oxide synthase (iNOS), cyclooxygenase-2 (COX-2), NLRP3 and nuclear translocation of nuclear factor kappa B (NF-κB) p65. In addition, AGEs induced both M1 (CD16/32, M1 marker) and M2 (CD206, M2 marker) phenotype in BV2 cells. Fasudil and FPS-ZM1 led to a decreased M1 and increased M2 phenotype. Together, these results indicate that the AGEs/RAGE/Rho/ROCK pathway in BV2 cells could intensify the non-specific inflammation of AD, which will provide novel strategies for the development of anti-AD drugs.
Assuntos
Proteínas de Ligação ao Cálcio/metabolismo , Polaridade Celular/fisiologia , Produtos Finais de Glicação Avançada/metabolismo , Proteínas dos Microfilamentos/metabolismo , Microglia/fisiologia , NF-kappa B/metabolismo , Transdução de Sinais/fisiologia , 1-(5-Isoquinolinasulfonil)-2-Metilpiperazina/análogos & derivados , 1-(5-Isoquinolinasulfonil)-2-Metilpiperazina/farmacologia , Animais , Benzamidas/farmacologia , Miosinas Cardíacas/metabolismo , Linhagem Celular Transformada , Polaridade Celular/efeitos dos fármacos , Ciclo-Oxigenase 2/metabolismo , Citocinas/metabolismo , Relação Dose-Resposta a Droga , Produtos Finais de Glicação Avançada/antagonistas & inibidores , Produtos Finais de Glicação Avançada/farmacologia , Camundongos , Microglia/classificação , Microglia/efeitos dos fármacos , Cadeias Leves de Miosina/metabolismo , Proteína 3 que Contém Domínio de Pirina da Família NLR/metabolismo , Fosforilação/efeitos dos fármacos , Inibidores de Proteínas Quinases/farmacologia , Espécies Reativas de Oxigênio/metabolismo , Transdução de Sinais/efeitos dos fármacos , Quinases Associadas a rho/metabolismoRESUMO
Amounting evidences demonstrated that Rho/Rho-associated kinase (ROCK) might be a novel target for the therapy of Parkinson's disease (PD). Recently, we synthesized L-F001 and revealed it was a potent ROCK inhibitor with multifunctional effects. Here we investigated the effects of L-F001 in PD models. We found that L-F001 potently attenuated 6-OHDA-induced cytotoxicity in PC12 cells and significantly decreased intracellular reactive oxygen species (ROS), prevented the 6-OHDA-induced decline of mitochondrial membrane potential and intracellular GSH levels. In addition, L-F001 increased Akt and GSK-3beta phosphorylation and induced the nuclear Nrf2 and HO-1 expression in a time- and concentration-dependent manner. Moreover, L-F001 restored the levels of p-Akt and p-GSK-3beta (Ser9) as well as HO-1 expression reduced by 6-OHDA. Those effects were blocked by the specific PI3K inhibitor, LY294002, indicating the involvement of Akt/GSK-3beta pathway in the neuroprotective effect of L-F001. In addition, L-F001 significantly attenuated the tyrosinehydroxylase immunoreactive cell loss in 1-methyl-4-phenyl-1,2,3,6 tetrahydropyridine (MPTP)-induced mice PD model. Together, our findings suggest that L-F001 prevents 6-OHDA-induced cell death through activating Akt/GSK-3beta and Nrf2/HO-1 signaling pathway and attenuates MPTP-induced dopaminergic neuron toxicity in mice. L-F001 might be a promising drug candidate for PD.
Assuntos
Azepinas/farmacologia , Neurônios Dopaminérgicos/metabolismo , Glicogênio Sintase Quinase 3 beta/metabolismo , Heme Oxigenase-1/metabolismo , Proteínas de Membrana/metabolismo , Fator 2 Relacionado a NF-E2/metabolismo , Proteínas Proto-Oncogênicas c-akt/metabolismo , Sulfonamidas/farmacologia , 1-Metil-4-Fenil-1,2,3,6-Tetra-Hidropiridina/farmacologia , Animais , Morte Celular/efeitos dos fármacos , Morte Celular/fisiologia , Neurônios Dopaminérgicos/efeitos dos fármacos , Relação Dose-Resposta a Droga , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Fármacos Neuroprotetores/farmacologia , Oxidopamina/toxicidade , Células PC12 , Inibidores de Proteínas Quinases/farmacologia , Ratos , Transdução de Sinais/efeitos dos fármacos , Transdução de Sinais/fisiologia , Quinases Associadas a rho/antagonistas & inibidoresRESUMO
A series of rivastigmine-caffeic acid and rivastigmine-ferulic acid hybrids were designed, synthesized, and evaluated as multifunctional agents for Alzheimer's disease (AD) in vitro. The new compounds exerted antioxidant neuroprotective properties and good cholinesterases (ChE) inhibitory activities. Some of them also inhibited amyloid protein (Aß) aggregation. In particular, compound 5 emerged as promising drug candidates endowed with neuroprotective potential, ChE inhibitory, Aß self-aggregation inhibitory and copper chelation properties. These data suggest that compound 5 offers an attractive starting point for further lead optimization in the drug-discovery process against AD.
Assuntos
Doença de Alzheimer/tratamento farmacológico , Ácidos Cumáricos/farmacologia , Rivastigmina/farmacologia , Peptídeos beta-Amiloides/efeitos dos fármacos , Peptídeos beta-Amiloides/metabolismo , Antioxidantes/química , Inibidores da Colinesterase/química , Inibidores da Colinesterase/farmacocinética , Ácidos Cumáricos/química , Descoberta de Drogas/métodos , Humanos , Técnicas In Vitro/métodos , Fármacos Neuroprotetores/química , Fármacos Neuroprotetores/farmacologia , Rivastigmina/química , Relação Estrutura-AtividadeRESUMO
Methylene blue (MB) can ameliorate behavioral, neurochemical, and neuropathological impairments in animal models of acute and chronic neurodegenerative disorders, but the underlying mechanism remains unclear. Myocyte enhancer factor 2 (MEF2D) is known to promote neuronal survival in several models, and several survival and death signals converge on MEF2D and regulate its activity. Here, we investigated the role of MEF2D in the neuroprotective effect of MB against glutamate-induced toxicity in HT22 neuronal cells. Our results showed that MB, event at less than 100 nM, improved the viability of HT22 cells exposed to 2 mM glutamate. MB attenuated the mitochondrial impairment and quenches the reactive oxygen species (ROS) induced by glutamate. Surprisingly, MB at 50-200 nM did not affect the Nrf2/HO-1 pathway, an important endogenous anti-oxidative system. Further study showed that MB increased the transcription and translation of MEF2D. In addition, MB upregulated the expression of mitochondrial NADH dehydrogenase 6 (ND6) in a MEF2D-dependent manner. Knockdown of MEF2D abolished both MB-medicated increase of ND6 and MB-induced neuroprotection against glutamate-induced toxicity. Moreover, we showed that MB promoted Akt function activity, suppressed GSK-3ß activity, and increased MEF2D level in hippocampus of mice and HT22 cells. These findings for the first time demonstrate that MB protects HT22 neuronal cells against glutamate-induced cell death partially via the regulation of MEF2D-associated survival pathway.
Assuntos
Hipocampo/efeitos dos fármacos , Azul de Metileno/farmacologia , Fármacos Neuroprotetores/farmacologia , Estresse Oxidativo/efeitos dos fármacos , Animais , Apoptose/efeitos dos fármacos , Ácido Glutâmico/metabolismo , Ácido Glutâmico/farmacologia , Hipocampo/metabolismo , Fatores de Transcrição MEF2/metabolismo , Camundongos , Mitocôndrias/efeitos dos fármacos , Mitocôndrias/metabolismo , Neurônios/efeitos dos fármacos , Neurônios/metabolismo , Espécies Reativas de Oxigênio/metabolismo , Transdução de Sinais/efeitos dos fármacosRESUMO
The melastatin-like transient receptor potential 7 (TRPM7) has been implicated in proliferation or apoptosis of some cancers, indicating the potential of TRPM7 as an anti-anaplastic target. Here, we identified the characteristic TRPM7 channel currents in human malignant glioma MGR2 cells, which could be blocked by a pharmacologic inhibitor Gd3+. We mined the clinical sample data from Oncomine Database and found that human malignant glioma tissues expressed higher TRPM7 mRNA than normal brain ones. Importantly, we identified a widely used clinical anesthetic midazolam as a TRPM7 inhibitor. Midazolam treatment for seconds suppressed the TRPM7 currents and calcium influx, and treatment for 48 h inhibited the TRPM7 expression. The inhibitory effect on TRPM7 accounts for the proliferation loss and G0/G1 phase cell cycle arrest induced by midazolam. Our data demonstrates that midazolam represses proliferation of human malignant glioma cells through inhibiting TRPM7 currents, which may be further potentiated by suppressing the expression of TRPM7. Our result indicates midazolam as a pharmacologic lead compound with brain-blood barrier permeability for targeting TRPM7 in the glioma.
Assuntos
Ansiolíticos/farmacologia , Cálcio/metabolismo , Proliferação de Células/efeitos dos fármacos , Glioma/tratamento farmacológico , Midazolam/farmacologia , Proteínas Serina-Treonina Quinases/antagonistas & inibidores , Canais de Cátion TRPM/antagonistas & inibidores , Apoptose/efeitos dos fármacos , Western Blotting , Ciclo Celular/efeitos dos fármacos , Mineração de Dados , Bases de Dados Factuais , Imunofluorescência , Glioma/metabolismo , Glioma/patologia , Humanos , Processamento de Imagem Assistida por Computador/métodos , Proteínas Serina-Treonina Quinases/genética , Proteínas Serina-Treonina Quinases/metabolismo , RNA Mensageiro/genética , RNA Interferente Pequeno/genética , Reação em Cadeia da Polimerase em Tempo Real , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Canais de Cátion TRPM/genética , Canais de Cátion TRPM/metabolismo , Células Tumorais CultivadasRESUMO
Oxidative stress mediates the pathogenesis of neurodegenerative disorders. Gartanin, a natural xanthone of mangosteen, possesses multipharmacological activities. Herein, the neuroprotection capacity of gartanin against glutamate-induced damage in HT22 cells and its possible mechanism(s) were investigated for the first time. Glutamate resulted in cell death in a dose-dependent manner and supplementation of 1-10 µM gartanin prevented the detrimental effects of glutamate on cell survival. Additional investigations on the underlying mechanisms suggested that gartanin could effectively reduce glutamate-induced intracellular ROS generation and mitochondrial depolarization. We further found that gartanin induced HO-1 expression independent of nuclear factor erythroid-derived 2-like 2 (Nrf2). Subsequent studies revealed that the inhibitory effects of gartanin on glutamate-induced apoptosis were partially blocked by small interfering RNA-mediated knockdown of HO-1. Finally, the protein expression of phosphorylation of AMP-activated protein kinase (AMPK) and its downstream signal molecules, Sirtuin activator (SIRT1) and peroxisome proliferator-activated receptor-γ coactivator-1α (PGC-1α), increased after gartanin treatment. Taken together, these findings suggest gartanin is a potential neuroprotective agent against glutamate-induced oxidative injury partially through increasing Nrf-2-independed HO-1 and AMPK/SIRT1/PGC-1α signaling pathways.
Assuntos
Proteínas Quinases Ativadas por AMP/metabolismo , Apoptose/efeitos dos fármacos , Heme Oxigenase-1/metabolismo , Proteínas de Membrana/metabolismo , Fator 2 Relacionado a NF-E2/metabolismo , Neurônios/efeitos dos fármacos , Xantonas/farmacologia , Animais , Linhagem Celular , Sobrevivência Celular/efeitos dos fármacos , Ácido Glutâmico/farmacologia , Camundongos , Neurônios/citologia , Neurônios/metabolismo , Fármacos Neuroprotetores/farmacologia , Estresse Oxidativo/efeitos dos fármacos , Espécies Reativas de Oxigênio/metabolismo , Transdução de Sinais/efeitos dos fármacos , Xantonas/químicaRESUMO
Natural xanthones have diversity pharmacological activities. Here, a series of xanthones isolated from the pericarps of Garcinia mangostana Linn, named α-Mangostin, 8-Deoxygartanin, Gartanin, Garciniafuran, Garcinone C, Garcinone D, and γ-Mangostin were investigated. Biological screening performed in vitro and in Escherichia coli cells indicated that most of the xanthones exhibited significant inhibition of self-induced ß-amyloid (Aß) aggregation and also ß-site amyloid precursor protein-cleaving enzyme 1, acted as potential antioxidants and biometal chelators. Among these compounds, α-Mangostin, Gartanin, Garcinone C and γ-Mangostin showed better antioxidant properties to scavenge Diphenyl-1-(2,4,6-trinitrophenyl) hydrazyl (DPPH) free radical than Trolox, and potent neuroprotective effects against glutamate-induced HT22 cell death partly by up-regulating HO-1 protein level and then scavenging reactive oxygen species. Moreover, Gartanin, Garcinone C and γ-Mangostin could be able to penetrate the blood-brain barrier (BBB) in vitro. These findings suggest that the natural xanthones have multifunctional activities against Alzheimer's disease (AD) and could be promising compounds for the therapy of AD.
Assuntos
Doença de Alzheimer/metabolismo , Garcinia mangostana , Extratos Vegetais/uso terapêutico , Xantonas/uso terapêutico , Doença de Alzheimer/tratamento farmacológico , Secretases da Proteína Precursora do Amiloide/antagonistas & inibidores , Secretases da Proteína Precursora do Amiloide/metabolismo , Peptídeos beta-Amiloides/antagonistas & inibidores , Peptídeos beta-Amiloides/metabolismo , Animais , Ácido Aspártico Endopeptidases/antagonistas & inibidores , Ácido Aspártico Endopeptidases/metabolismo , Linhagem Celular , Camundongos , Extratos Vegetais/isolamento & purificação , Extratos Vegetais/farmacologia , Xantonas/isolamento & purificação , Xantonas/farmacologiaRESUMO
Survival of patients with glioblastoma (GBM) remains poor, and novel treatment methods are urgently needed. In this study, we tested the effects of a combination of fasudil, a ROCK inhibitor, and clioquinol, an 8-hydroxyquinoline derivative with antimicrobial properties, on human GBM U87 cells. Combination treatment synergistically inhibited the viability of glioma cells but not mouse normal neuron HT22 cells and significantly induced mitochondria-mediated apoptosis. Moreover, the combination was also found to trigger macro-autophagy (henceforth referred to as autophagy) by increasing the expression levels of several proteins involved in the induction of autophagy. Further studies showed that 3-methyladenine (3-MA) or chloroquine (CQ), two autophagy inhibitors, abrogated the cytotoxic effects of the combination treatment as well as the autophagy. Overall, we demonstrated that fasudil and clioquinol show synergistic anti-cancer effects, providing evidence for the further development of combination therapy for GBM.
Assuntos
1-(5-Isoquinolinasulfonil)-2-Metilpiperazina/análogos & derivados , Apoptose/efeitos dos fármacos , Autofagia/efeitos dos fármacos , Neoplasias Encefálicas/tratamento farmacológico , Neoplasias Encefálicas/patologia , Clioquinol/farmacologia , Sinergismo Farmacológico , 1-(5-Isoquinolinasulfonil)-2-Metilpiperazina/farmacologia , Animais , Western Blotting , Neoplasias Encefálicas/metabolismo , Proliferação de Células/efeitos dos fármacos , Quimioterapia Combinada , Citometria de Fluxo , Glioblastoma , Humanos , Camundongos , Mitocôndrias/efeitos dos fármacos , Inibidores de Proteínas Quinases/farmacologia , Células Tumorais CultivadasRESUMO
Neural stem cells (NSCs) are multipotent cells which are capable of self-replication and differentiation into neurons, astrocytes or oligodendrocytes in the central nervous system (CNS). NSCs are found in two main regions in the adult brain: the subgranular zone (SGZ) in the hippocampal dentate gyrus (DG) and the subventricular zone (SVZ). The recent discovery of NSCs in the adult mammalian brain has fostered a plethora of translational and preclinical studies to investigate novel approaches for the therapy of neurodegenerative diseases. Melatonin is the major secretory product synthesized and secreted by the pineal gland and shows both a wide distribution within phylogenetically distant organisms from bacteria to humans and a great functional versatility. Recently, accumulated experimental evidence showed that melatonin plays an important role in NSCs, including its proliferation, differentiation and survival, which are modulated by many factors including MAPK/ERK signaling pathway, histone acetylation, neurotrophic factors, transcription factors, and apoptotic genes. The purpose of this review is to summarize the beneficial effects of melatonin on NSCs and further to discuss the potential usage of melatonin and its derivatives or analogues in the treatment of CNS neurodegenerative diseases.
Assuntos
Melatonina/análogos & derivados , Melatonina/farmacologia , Células-Tronco Neurais/efeitos dos fármacos , Animais , Diferenciação Celular/efeitos dos fármacos , Proliferação de Células/efeitos dos fármacos , Humanos , Melatonina/química , Modelos BiológicosRESUMO
Overstimulation of NMDA-type glutamate receptors is believed to be responsible for neuronal death of the CNS in various disorders, including cerebral and spinal cord ischemia. However, the intrinsic and physiological mechanisms of modulation of these receptors are essentially unknown. Here we report that cholestane-3ß,5α,6ß-triol (triol), a major metabolite of cholesterol, is an endogenous neuroprotectant and protects against neuronal injury both in vitro and in vivo via negative modulation of NMDA receptors. Treatment of cultured neurons with triol protects against glutamate-induced neurotoxicity, and administration of triol significantly decreases neuronal injury after spinal cord ischemia in rabbits and transient focal cerebral ischemia in rats. An inducible elevation of triol is associated with ischemic preconditioning and subsequent neuroprotection in the spinal cord of rabbits. This neuroprotection is effectively abolished by preadministration of a specific inhibitor of triol synthesis. Physiological concentrations of triol attenuate [Ca(2+)]i induced by glutamate and decrease inward NMDA-mediated currents in cultured cortical neurons and HEK-293 cells transiently transfected with NR1/NR2B NMDA receptors. Saturable binding of [(3)H]triol to cerebellar granule neurons and displacement of [(3)H]MK-801 binding to NMDA receptors by triol suggest that direct blockade of NMDA receptors may underlie the neuroprotective properties. Our findings suggest that the naturally occurring oxysterol, the major cholesterol metabolite triol, functions as an endogenous neuroprotectant in vivo, which may provide novel insights into understanding and developing potential therapeutics for disorders in the CNS.
Assuntos
Lesões Encefálicas/prevenção & controle , Colestanóis/uso terapêutico , Fármacos Neuroprotetores/uso terapêutico , Isquemia do Cordão Espinal/prevenção & controle , Adulto , Animais , Lesões Encefálicas/etiologia , Células Cultivadas , Sistema Nervoso Central/citologia , Colestanóis/sangue , Modelos Animais de Doenças , Maleato de Dizocilpina/farmacocinética , Antagonistas de Aminoácidos Excitatórios/farmacocinética , Feminino , Ácido Glutâmico/farmacologia , Humanos , Infarto da Artéria Cerebral Média/complicações , Masculino , Neurônios/efeitos dos fármacos , Neurônios/fisiologia , Ligação Proteica/efeitos dos fármacos , Coelhos , Ratos , Ratos Sprague-Dawley , Fatores de Tempo , Distribuição Tecidual/efeitos dos fármacos , Distribuição Tecidual/fisiologia , Adulto JovemRESUMO
BACKGROUND: Glioblastoma (GBM), the most common primary brain tumor, is the most aggressive malignancy in humans. Its rapid proliferation is a major obstacle to successful treatment. Patients with GBM often suffer from psychological disturbances associated with poor prognosis and physical discomfort. Diazepam is one of the most frequently used benzodiazepines (BZs) in cancer patients for its desirable psychotropic effects. The central effects of BZs are mediated by the activation of central BZ receptors. This study investigates whether diazepam has inhibitory effect on proliferation of GBM cell line T98G and explores its possible mechanism. METHODS: Cell viability and proliferation were respectively determined by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-tetrazolium bromide (MTT) assay and 5-bromo-2'-deoxyuridine (BrdU) incorporation assay. Cell cycle distribution was examined by flow cytometry. Western blot with specific protein antibodies was used to detect regulatory proteins involved in cell cycle regulation. RESULTS: Diazepam significantly decreased the proliferation of T98G cells in a dose-dependent and time-dependent manner. This effect was not reversed by the central BZ receptor antagonist flumazenil or the peripheral BZ receptor antagonist PK11195, indicating that it was not mediated by BZ receptors. Flow cytometry indicated that diazepam caused a cell accumulation in G0/G1 phase, thereby contributing to cell proliferation inhibition. Furthermore, our findings showed that lessened phosphorylation of Rb accounted for diazepam-induced G0/G1 phase arrest. CONCLUSIONS: Diazepam inhibits the proliferation of human GBM T98G cells by inducing G0/G1 phase arrest. Diazepam has potential to be a lead for new drugs in GBM therapy because of its antitumor activity.
Assuntos
Neoplasias Encefálicas/patologia , Proliferação de Células/efeitos dos fármacos , Diazepam/farmacologia , Pontos de Checagem da Fase G1 do Ciclo Celular/efeitos dos fármacos , Moduladores GABAérgicos/farmacologia , Glioblastoma/patologia , Antimetabólitos , Benzimidazóis , Western Blotting , Bromodesoxiuridina , Ciclo Celular/efeitos dos fármacos , Proteínas de Ciclo Celular/metabolismo , Linhagem Celular Tumoral , Sobrevivência Celular/efeitos dos fármacos , Corantes , Corantes Fluorescentes , Fase G1/efeitos dos fármacos , Humanos , L-Lactato Desidrogenase/metabolismo , Fase de Repouso do Ciclo Celular/efeitos dos fármacos , Fase S/efeitos dos fármacos , Sais de Tetrazólio , TiazóisRESUMO
Transient receptor potential melastatin 7 (TRPM7), a Ca(2+)-permeable channel, has been demonstrated to be present in cancer cells and involved in their growth and proliferation. The present study used midazolam, a benzodiazepine class anesthesic, to pharmacologically intervene in the expression of TRPM7 and to inhibit cancer cell proliferation. Midazolam significantly inhibited the growth and proliferation of FaDu human hypopharyngeal squamous cell carcinoma cells, concurring with the induction of G(0)/G(1) cell cycle arrest and blockage of Rb activation. Central-type and peripheral-type benzodiazepine receptor antagonists did not abrogate proliferation inhibition by midazolam, while the specific TRPM7 agonist bradykinin reversed this effect. In addition, other benzodiazepines, diazepam and clonazepam also exhibited anti-proliferative activities. The inhibitory activity on cancer cell growth and proliferation, combined with the TRPM-dependent mechanism, reveals the anticancer potential of midazolam as a TRPM7 inhibitor and supports the suggestion that TRPM7 is a valuable target for pharmaceutical intervention.
RESUMO
Tumor invasion and migration are major causes of mortality in patients with cervical carcinoma. Tumors under hypoxic conditions are more invasive and have a higher metastasic activity. Lysyl oxidase (LOX) is a hypoxia-responsive gene. LOX has been shown to be essential for hypoxia-induced metastasis in breast cancer. However, the direct impact of LOX on cervical cancer cell motility remains poorly understood. Our study revealed that LOX expression at protein and catalytic levels is upregulated in cervical cancer cells upon exposure to hypoxia. Hypoxia induced mesenchymal-like morphological changes in HeLa and SiHa cells which were accompanied by upregulation of α-SMA and vimentin, two mesenchymal markers, and downregulation of E-cadherin, an epithelial marker, indicating the epithelial-mesenchymal transition (EMT) of cervical cancer cells occurred under hypoxic conditions. Treatment of tumor cells with ß-aminopropionitrile (BAPN), an active site inhibitor of LOX, blocked the hypoxia-induced EMT morphological and marker protein changes, and inhibited invasion and migration capacities of cervical carcinoma cells in vitro. Collectively, these findings suggest LOX enhances hypoxia-induced invasion and migration in cervical cancer cells mediated by the EMT which can be inhibited by BAPN.