Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 9 de 9
Filtrar
1.
Nat Prod Commun ; 11(4): 457-60, 2016 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-27396192

RESUMEN

The effect of four pyrazine derivatives on the content of phenolic compounds in Urtica dioica L. and rutin in Fagopyrum esculentum Moench was studied. Pyrazine derivatives H1 and H2 were used on U. dioica, and derivatives S1 and S2 on F. esculentum, both separately and in combination with urea. The content of phenolic compounds in the stems of U. dioica after treatment with H2 at a concentration of 10(-3) M significantly increased compared with the control and to a lower concentration of the same pyrazine derivative. In the case of S1 and S2 for F. esculentum, rutin content also increased in stems, mainly after treatment together with urea. By contrast, rutin and phenolics contents in the leaves did not change in comparison with controls after application of H1, H2, S I and S2. Treatment with H1 and H2 in two chosen concentrations resulted in a significant increase in the net photosynthetic rate, transpiration rate and stomatal conductance. A slight increase in the rate of photosynthesis was observed also after application of variants of S1 and S1 with urea. Pyrazine derivatives did not show any effect on either the relative content of chlorophyll or chlorophyll fluorescence. A slight weight reduction of above ground biomass was shown only after application of Si and S2. Dark necrosis on the edges and center of the leaves was observed in all treated plants after pyrazine application. The results suggest that all the pyrazine derivatives possess herbicidal effects.


Asunto(s)
Fagopyrum/efectos de los fármacos , Fenoles/metabolismo , Pirazinas/toxicidad , Rutina/biosíntesis , Urtica dioica/efectos de los fármacos , Fagopyrum/metabolismo , Fotosíntesis/efectos de los fármacos , Desarrollo de la Planta/efectos de los fármacos , Hojas de la Planta/metabolismo , Tallos de la Planta/metabolismo , Transpiración de Plantas/efectos de los fármacos , Pirazinas/administración & dosificación , Urtica dioica/metabolismo
2.
Bioorg Med Chem Lett ; 23(6): 1588-91, 2013 Mar 15.
Artículo en Inglés | MEDLINE | ID: mdl-23414803

RESUMEN

We report here the discovery of a novel series of selective mTOR kinase inhibitors and the identification of CC214-2, a compound with demonstrated anti-tumor activity upon oral dosing in a PC3 prostate cancer xenograft model. A series of 4,6-disubstituted-3,4-dihydropyrazino[2,3-b]pyrazine-2(1H)-ones were discovered through a core modification of our original compound series. Analogs from this series have excellent mTOR potency and maintain selectivity over the related PI3Kα lipid kinase. Compounds such as CC214-2 were found to block both mTORC1(pS6) and mTORC2(pAktS473) signaling in PC3 cancer cells, in vitro and in vivo.


Asunto(s)
Antineoplásicos/química , Inhibidores de Proteínas Quinasas/química , Pirazinas/química , Serina-Treonina Quinasas TOR/antagonistas & inhibidores , Administración Oral , Animales , Antineoplásicos/farmacocinética , Antineoplásicos/uso terapéutico , Línea Celular Tumoral , Proliferación Celular/efectos de los fármacos , Evaluación Preclínica de Medicamentos , Semivida , Humanos , Masculino , Ratones , Fosfatidilinositol 3-Quinasas/metabolismo , Inhibidores de las Quinasa Fosfoinosítidos-3 , Neoplasias de la Próstata/tratamiento farmacológico , Neoplasias de la Próstata/metabolismo , Neoplasias de la Próstata/patología , Inhibidores de Proteínas Quinasas/farmacocinética , Inhibidores de Proteínas Quinasas/uso terapéutico , Proteínas Proto-Oncogénicas c-akt/metabolismo , Pirazinas/farmacocinética , Pirazinas/uso terapéutico , Pirazinas/toxicidad , Transducción de Señal/efectos de los fármacos , Serina-Treonina Quinasas TOR/metabolismo , Trasplante Heterólogo
3.
Toxicol Pathol ; 41(5): 722-35, 2013 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-23125115

RESUMEN

We evaluated immunohistochemistry (von Willebrand Factor [vWF] or fibrinogen) and systemic and coronary arterial physiological parameters in beagle dogs to investigate early arterial lesions induced by the potassium channel opener, ZD6169, or the endothelin receptor antagonist, ZD1611. Dogs given an oral dose of ZD6169 (experiment 1) were terminated 1 day later and showed arterial and myocardial lesions. Minimal arterial lesions exhibited few condensed medial smooth muscle cells only, with others showing segmental medial necrosis occasionally with medial/adventitial acute inflammation. Intercellular immunostaining was seen in ostensibly normal tissue, where no pathology was present in conventionally stained sections. vWF and fibrinogen are valuable tools for detecting disruption of arterial integrity. In experiment 2, 2 dogs were given a single high dose of ZD6169 or ZD1611 and BP/HR monitored by conventional measures or telemetry. Substantially reduced systolic/diastolic BP and increased HR occurred within 10 min of ZD6169 infusion: ZD1611 caused minor BP decrease and HR increase. In experiment 3, both drugs given to anaesthetized dogs induced markedly exaggerated systolic phasic forward and reverse flow in left descending and right coronary arteries. Diastolic coronary artery flows were unaffected with ZD1611 and increased slightly with ZD6169. In both coronary arteries, the ZD1611-induced increase in flows paralleled decreased resistance.


Asunto(s)
Amidas/toxicidad , Arteritis/patología , Benzofenonas/toxicidad , Vasos Coronarios/química , Vasos Coronarios/patología , Pirazinas/toxicidad , Animales , Arteritis/inducido químicamente , Arteritis/fisiopatología , Biomarcadores/análisis , Presión Sanguínea/efectos de los fármacos , Perros , Electrocardiografía/efectos de los fármacos , Femenino , Fibrinógeno/metabolismo , Corazón/efectos de los fármacos , Corazón/fisiopatología , Frecuencia Cardíaca/efectos de los fármacos , Inmunohistoquímica , Miocardio/patología , Sulfonamidas/toxicidad , Factor de von Willebrand/metabolismo
4.
Pharmacology ; 88(1-2): 100-13, 2011.
Artículo en Inglés | MEDLINE | ID: mdl-21865767

RESUMEN

Bortezomib (Velcade®) is a proteasome inhibitor that has been approved for the treatment of multiple myeloma and mantle cell lymphoma. It has been shown to inhibit the expression of cell adhesion molecules, co-stimulatory molecules, and NFκB activation, to deplete alloreactive T lymphocytes, and to decrease Th1 cytokine production. The anti-inflammatory effects of bortezomib were further investigated in this current set of studies. Systemic treatment with bortezomib was efficacious in the thioglycolate-induced MCP-1 production model, and the dinitrofluorobenzene-induced delayed-type hypersensitivity model. Psoriasis is an autoimmune disease that affects about 2% of the world population. Many treatments have been reported with varying degrees of efficacy. A topical bortezomib formulation was developed to minimize systemic exposure. Its tolerability was investigated in a topical imiquimod (IMQ)-induced psoriasis model. Daily application of IMQ on mouse skin induced inflamed scaly skin lesions resembling plaque-type psoriasis. Fatality was observed in the 1-mg/ml dose group. At 0.1 and 0.01 mg/ml, bortezomib potentiated IMQ-induced erythema, scaling, skin thickening, and caused necrotic lesions. Lower doses had no effect on the clinical observations. Histologically, bortezomib dose-dependently increased parakeratosis, hyperkeratosis, acanthosis, and inflammatory cell infiltration. This study demonstrated that topical bortezomib is not suitable for the treatment of psoriasis.


Asunto(s)
Antiinflamatorios/farmacología , Ácidos Borónicos/farmacología , Factores Inmunológicos/farmacología , Pirazinas/farmacología , Adyuvantes Inmunológicos/toxicidad , Aminoquinolinas/toxicidad , Animales , Antiinflamatorios/administración & dosificación , Antiinflamatorios/uso terapéutico , Antiinflamatorios/toxicidad , Ácidos Borónicos/administración & dosificación , Ácidos Borónicos/uso terapéutico , Ácidos Borónicos/toxicidad , Bortezomib , Dinitrofluorobenceno/toxicidad , Modelos Animales de Enfermedad , Composición de Medicamentos , Evaluación Preclínica de Medicamentos , Estabilidad de Medicamentos , Femenino , Hipersensibilidad Tardía/inducido químicamente , Hipersensibilidad Tardía/tratamiento farmacológico , Imiquimod , Factores Inmunológicos/administración & dosificación , Factores Inmunológicos/uso terapéutico , Factores Inmunológicos/toxicidad , Irritantes/toxicidad , Masculino , Ratones , Ratones Endogámicos BALB C , Ratones Endogámicos ICR , Peritonitis/inducido químicamente , Peritonitis/tratamiento farmacológico , Psoriasis/inducido químicamente , Psoriasis/tratamiento farmacológico , Pirazinas/administración & dosificación , Pirazinas/uso terapéutico , Pirazinas/toxicidad , Distribución Aleatoria , Temperatura , Tioglicolatos/toxicidad
5.
Ann Rheum Dis ; 68(11): 1761-7, 2009 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-19054826

RESUMEN

OBJECTIVES: Nuclear factor kappa B (NF-kappaB) is a major regulator of pivotal proinflammatory cytokines in the pathogenesis of rheumatoid arthritis (RA). Bortezomib inhibits NF-kappaB activation by blocking the degradation of the NF-kappaB inhibitor, I-kappaB. In this study, the efficacy of bortezomib on murine collagen-induced arthritis (CIA) was investigated. METHODS: Thirty-five male DBA/1 mice were divided into five groups. All mice except controls were injected with type II collagen. Mice in the bortezomib-treated groups were injected intraperitoneally with 0.01, 0.1 and 1 mg/kg bortezomib twice a week for 2 weeks. Controls and mice in the untreated group were also injected intraperitoneally with phosphate-buffered saline in the same manner. Arthritis score and paw thickness were measured and histopathological assessment of joint sections was performed. The expression of proinflammatory cytokines and enzymes was evaluated by immunohistochemical staining. Joint destruction was confirmed using three-dimensional micro-computerised tomography (CT). Blood cells were counted and liver and kidney functions were monitored. RESULTS: Bortezomib significantly attenuated the severity of arthritis and histopathological findings in CIA mice. The expression of tumour necrosis factor alpha, IL-1beta, IL-6, matrix metalloproteinase 3, cyclooxygenase 2 and inducible nitric oxide synthase decreased in bortezomib-treated mice compared with untreated mice. In addition, micro-CT confirmed that bortezomib reduced joint destruction. No adverse effects in blood cells, liver or kidneys were observed with bortezomib treatment. CONCLUSIONS: These data suggest that bortezomib may play an anti-inflammatory role in the pathophysiology of RA and serve as a new therapeutic modality for RA.


Asunto(s)
Antirreumáticos/uso terapéutico , Artritis Experimental/tratamiento farmacológico , Ácidos Borónicos/uso terapéutico , Inhibidores de Proteasas/uso terapéutico , Pirazinas/uso terapéutico , Animales , Antirreumáticos/administración & dosificación , Antirreumáticos/toxicidad , Artritis Experimental/diagnóstico por imagen , Artritis Experimental/patología , Ácidos Borónicos/administración & dosificación , Ácidos Borónicos/toxicidad , Bortezomib , Relación Dosis-Respuesta a Droga , Evaluación Preclínica de Medicamentos/métodos , Mediadores de Inflamación/metabolismo , Masculino , Ratones , Ratones Endogámicos DBA , Inhibidores de Proteasas/administración & dosificación , Inhibidores de Proteasas/toxicidad , Pirazinas/administración & dosificación , Pirazinas/toxicidad , Índice de Severidad de la Enfermedad , Resultado del Tratamiento , Microtomografía por Rayos X
6.
Zhong Yao Cai ; 29(8): 813-6, 2006 Aug.
Artículo en Chino | MEDLINE | ID: mdl-17076242

RESUMEN

OBJECTIVE: To study the using of the method in vitro and in vivo of lasting time of ciliary movement in ligustrazine, synthetic borneol. METHODS: (1) Method in vitro-The lasting time of ciliary movement was observed with forty-fold optical microscope after dropping liquid medicine on exteacorporeal frog palate mucosa. Then mucosa was cleared. It was observed whether the ciliary movement was recovered and the lasting time was recorded from recovering to stopping once again. (2) Method in vivo-Liquid medicine or normal saline was dropped on frog palate mucosa by contacting thirty minutes. Then mucosa was cleared. The lasting time of ciliary movement was observed with forty-fold optical microscope by separating palate mucosa. RESULTS: Relatively percentage of lasting time of ciliary movement of ligustrazine in vitro and in vivo was 9.8%, 87.3%; The relatively percentage of synthetic borneol in vitro and in vivo was 9.3%, 89.5%. CONCLUSION: The method in vitro and in vivo of lasting time of ciliary movement can be the one of the selecting ways of Chinese drug's toxicity of nasal mucosa, and it have virtues and defects respectively. Ligustrazine, synthetic borneol have significantly toxical effect on exteacorporeal lasting time of ciliary movement.


Asunto(s)
Canfanos/farmacología , Movimiento Celular/efectos de los fármacos , Cilios/efectos de los fármacos , Mucosa Nasal/efectos de los fármacos , Pirazinas/farmacología , Administración Intranasal , Animales , Canfanos/administración & dosificación , Canfanos/toxicidad , Medicamentos Herbarios Chinos/administración & dosificación , Medicamentos Herbarios Chinos/farmacología , Medicamentos Herbarios Chinos/toxicidad , Femenino , Masculino , Pirazinas/toxicidad , Rana esculenta , Tiempo
7.
J Pharmacol Exp Ther ; 292(2): 584-96, 2000 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-10640295

RESUMEN

Muscarinic M1 preferring agonists may improve cognitive deficits associated with Alzheimer's disease. Side effect assessment of the M1 preferring agonist WAY-132983 showed significant salivation (10 mg/kg i.p. or p.o.) and produced dose-dependent hypothermia after i. p. or p.o. administration. WAY-132983 significantly reduced scopolamine (0.3 mg/kg i.p.)-induced hyperswimming in mice. Cognitive assessment in rats used pretrained animals in a forced choice, 1-h delayed nonmatch-to-sample radial arm maze task. WAY-132983 (0.3 mg/kg i.p) significantly reduced scopolamine (0.3 mg/kg s.c.)-induced errors. Oral WAY-132983 attenuated scopolamine-induced errors; that is, errors produced after combining scopolamine and WAY-132983 (to 3 mg/kg p.o.) were not significantly increased compared with those of vehicle-treated control animals, whereas errors after scopolamine were significantly higher than those of control animals. With the use of miniosmotic pumps, 0.03 mg/kg/day (s.c.) WAY-132983 significantly reduced AF64A (3 nmol/3 microliter/lateral ventricle)-induced errors. Verification of AF64A cholinotoxicity showed significantly lower choline acetyltransferase activity in the hippocampi of AF64A-treated animals, with no significant changes in the striatal or frontal cortex. Cognitive assessment in primates involved the use of pretrained aged animals in a visual delayed match-to-sample procedure. Oral WAY-132983 significantly increased the number of correct responses during short and long delay interval testing. These effects were also apparent 24 h after administration. WAY-132983 exhibited cognitive benefit at doses lower than those producing undesirable effects; therefore, WAY-132983 is a potential candidate for improving the cognitive status of patients with Alzheimer's disease.


Asunto(s)
Conducta Animal/efectos de los fármacos , Encéfalo/metabolismo , Hidrocarburos Aromáticos con Puentes/farmacología , Cognición/efectos de los fármacos , Agonistas Muscarínicos/farmacología , Pirazinas/farmacología , Animales , Aziridinas/farmacología , Hidrocarburos Aromáticos con Puentes/administración & dosificación , Hidrocarburos Aromáticos con Puentes/toxicidad , Colina/análogos & derivados , Colina/farmacología , Colina O-Acetiltransferasa/metabolismo , Relación Dosis-Respuesta a Droga , Interacciones Farmacológicas , Femenino , Lóbulo Frontal/efectos de los fármacos , Lóbulo Frontal/metabolismo , Hipocampo/metabolismo , Hipotermia/inducido químicamente , Macaca mulatta , Masculino , Ratones , Agonistas Muscarínicos/administración & dosificación , Agonistas Muscarínicos/toxicidad , Bloqueantes Neuromusculares/farmacología , Pirazinas/administración & dosificación , Pirazinas/toxicidad , Piridinas/farmacología , Ratas , Ratas Sprague-Dawley , Salivación/efectos de los fármacos , Escopolamina/farmacología , Tiadiazoles/farmacología , Factores de Tiempo , Corteza Visual/efectos de los fármacos , Corteza Visual/metabolismo
8.
Zhongguo Zhong Yao Za Zhi ; 17(11): 680-2, 703-4, 1992 Nov.
Artículo en Chino | MEDLINE | ID: mdl-1301757

RESUMEN

The experiments showed that both tetramethylpyrazine and ferulic acid relaxed the norepinephrine-induced spasmodic contraction of rabbit and rat aorta strips, increased the coronary flow of isolated guinea pig hearts and reduced the whole blood viscosity in rats. Evaluated with Burgi's equation, the combined effect of these 2 drugs was obviously potentiated, but the combined acute toxicity in mice was greatly reduced.


Asunto(s)
Viscosidad Sanguínea/efectos de los fármacos , Ácidos Cumáricos/farmacología , Contracción Muscular/efectos de los fármacos , Músculo Liso Vascular/efectos de los fármacos , Pirazinas/farmacología , Animales , Aorta/efectos de los fármacos , Circulación Coronaria/efectos de los fármacos , Ácidos Cumáricos/toxicidad , Sinergismo Farmacológico , Femenino , Cobayas , Técnicas In Vitro , Dosificación Letal Mediana , Masculino , Ratones , Pirazinas/toxicidad , Conejos , Ratas , Ratas Sprague-Dawley
SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA