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2.
Clin Transl Oncol ; 17(1): 74-84, 2015 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-25472447

RESUMO

BACKGROUND: Choline kinase alpha (ChoKα) is a critical enzyme in the synthesis of phosphatidylcholine, a major structural component of eukaryotic cell membranes. ChoKα is overexpressed in a large variety of tumor cells and has been proposed as a target for personalized medicine, both in cancer therapy and rheumatoid arthritis. MATERIALS AND METHODS: Triterpene quinone methides (TPQ) bioactive compounds isolated from plants of the Celastraceae family and a set of their semisynthetic derivatives were tested against the recombinant human ChoKα. Those found active as potent enzymatic inhibitors were tested in vitro for antiproliferative activity against HT29 colorectal adenocarcinoma cells, and one of the active compounds was tested for in vivo antitumoral activity in mice xenographs of HT29 cells. RESULTS: Among 59 natural and semisynthetic TPQs tested in an ex vivo system, 14 were highly active as inhibitors of the enzyme ChoKα with IC50 <10 µM. Nine of these were potent antiproliferative agents (IC50 <10 µM) against tumor cells. At least one compound was identified as a new antitumoral drug based on its in vivo activity against xenographs of human HT-29 colon adenocarcinoma cells. CONCLUSIONS: The identification of a new family of natural and semisynthetic compounds with potent inhibitory activity against ChoKα and both in vitro antiproliferative and in vivo antitumoral activity supports further research on these inhibitors as potential anticancer agents. Their likely role as antiproliferative drugs deserves further studies in models of rheumatoid arthritis.


Assuntos
Antineoplásicos/farmacologia , Colina Quinase/antagonistas & inibidores , Adenocarcinoma/metabolismo , Animais , Antineoplásicos/química , Artrite Reumatoide/tratamento farmacológico , Produtos Biológicos , Linhagem Celular Tumoral , Proliferação de Células , Células HT29 , Humanos , Indolquinonas/química , Concentração Inibidora 50 , Dose Máxima Tolerável , Camundongos , Camundongos Nus , Simulação de Acoplamento Molecular , Transplante de Neoplasias , Neoplasias/tratamento farmacológico , Fosfatidilcolinas/química , Proteínas Recombinantes/química , Triterpenos/química
5.
Int J Paediatr Dent ; 14(3): 199-203, 2004 May.
Artigo em Inglês | MEDLINE | ID: mdl-15139955

RESUMO

INTRODUCTION: Previous investigations have demonstrated improved enamel caries resistance after laser irradiation. The purpose of this in vitro study was to assess the caries-preventive potential of 809 nm diode laser treatment of the enamel of primary teeth compared to topical fluoride application. METHODS: Eighty samples of sound primary teeth were embedded in plastic and stored in saline solution. The enamel surface of 80 samples was polished in an area of 2 x 2 mm. These tooth specimens were randomly assigned to one control and three test groups: (1) no treatment/control; (2) application of 0.1 mg of fluoride varnish (Duraphat) for 6 h; (3) diode laser application (809 nm, 140 mJ, 50 Hz, Ø 600 micro m fibre, contact mode, absorber, 1 min; ORA-LASER01 I.S.T.); and (4) combined application - laser/fluoride varnish. Caries-like lesions were created by pH-cycling. After lesion formation, longitudinal sections were taken and examined by polarized light microscopy. RESULTS: In the control group, all samples showed lesions up to 30 micro m in depth. After laser application, lesions could be identified in 15 out of 20 samples. Topical fluoride treatment in groups 2 (varnish) and 4 (laser/varnish) completely inhibited the development of caries-like lesions in all samples. CONCLUSION: In this in vitro investigation, topical fluoride treatment enhances the resistance of sound enamel of primary teeth more effectively than diode laser application.


Assuntos
Esmalte Dentário/efeitos da radiação , Fluoretos Tópicos/uso terapêutico , Terapia a Laser , Desmineralização do Dente/prevenção & controle , Dente Decíduo/efeitos da radiação , Distribuição de Qui-Quadrado , Terapia Combinada , Suscetibilidade à Cárie Dentária/efeitos dos fármacos , Suscetibilidade à Cárie Dentária/efeitos da radiação , Esmalte Dentário/efeitos dos fármacos , Esmalte Dentário/patologia , Humanos , Microscopia de Polarização , Fluoreto de Sódio/uso terapêutico , Desmineralização do Dente/patologia , Dente Decíduo/efeitos dos fármacos , Dente Decíduo/patologia
6.
J Nat Prod ; 66(5): 722-4, 2003 May.
Artigo em Inglês | MEDLINE | ID: mdl-12762819

RESUMO

The aerial parts of Nanodea muscosa, collected in Chile, yielded two new acetylenic acids. Their structures were elucidated by spectroscopic analyses, including 2D NMR techniques, as (13E)-octadec-13-en-11-ynoic acid (1) and (2E)-octadec-2-en-4-ynedioic acid (2). Compound 2 constitutes the first example of a conjugated ene-yne fatty diacid isolated from a natural source. Compounds 1 and 2 did not exhibit toxicity toward a panel of DNA damage checkpoint defective yeast mutants or show affinity for the 5-HT(1A), 5-HT(2A), D(2), and H(1) receptors.


Assuntos
Ácidos Graxos Insaturados/isolamento & purificação , Santalaceae/química , Alcinos , Chile , Dano ao DNA/efeitos dos fármacos , Ácidos Graxos Insaturados/química , Ácidos Graxos Insaturados/farmacologia , Estrutura Molecular , Receptor 5-HT2A de Serotonina , Receptores de Dopamina D2/efeitos dos fármacos , Receptores Histamínicos H1/efeitos dos fármacos , Receptores de Serotonina/efeitos dos fármacos , Receptores 5-HT1 de Serotonina , Saccharomyces cerevisiae/efeitos dos fármacos , Estereoisomerismo
7.
J Nat Prod ; 62(3): 434-6, 1999 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-10096852

RESUMO

The new nortriterpene methylene quinones amazoquinone (1) and (7S, 8S)-7-hydroxy-7,8-dihydro-tingenone (2), and the new norphenolic triterpenes 7,8-dihydro-6-oxo-tingenol (3), 23-nor-6-oxo-tingenol (4), and 23-oxo-iso-tingenone (5) were isolated from Maytenus amazonica. Their structures were elucidated by spectroscopic methods. Compounds 1, 2, 3, and 5 showed low antitumor activity against four cancer cell lines.


Assuntos
Antineoplásicos Fitogênicos/química , Plantas Medicinais/química , Quinonas/química , Triterpenos/química , Aldeído Redutase/antagonistas & inibidores , Animais , Antineoplásicos Fitogênicos/isolamento & purificação , Antineoplásicos Fitogênicos/farmacologia , Ensaios de Seleção de Medicamentos Antitumorais , Inibidores Enzimáticos/química , Inibidores Enzimáticos/isolamento & purificação , Inibidores Enzimáticos/farmacologia , Humanos , Camundongos , Camundongos Endogâmicos DBA , Peru , Quinonas/isolamento & purificação , Quinonas/farmacologia , Triterpenos/isolamento & purificação , Triterpenos/farmacologia , Células Tumorais Cultivadas
8.
Arch. oftalmol. B.Aires ; 61(3): 225-7, jul.-sept. 1986. tab
Artigo em Espanhol | LILACS | ID: lil-42202

RESUMO

Desde los trabajos de Ambache a partir de 1955, que demostraron que la sustancia a la que denominó Irin, era un compuesto de prostaglandinas E y F, se conoce que ellas son las responsables, a través de su presencia en la cámara anterior, de la hiperemia conjuntival, miosis, aumento del contenido proteico en el humor acuoso, disrupción de la barrera hemato-ocular y aumento de la presión intraocular. Efectuamos una revisión bibliográfica; propiciamos el uso de antinflamatorios no esteroideos, como inhibidores de la "PG" y presentamos una fórmula de aspirina soluble de uso tópico


Assuntos
Câmara Anterior , Aspirina/uso terapêutico , Hiperemia/tratamento farmacológico , Prostaglandinas E/farmacologia , Prostaglandinas F/farmacologia
9.
Arch. oftalmol. B. Aires ; 61(3): 225-7, jul.-sept. 1986. Tab
Artigo em Espanhol | BINACIS | ID: bin-31787

RESUMO

Desde los trabajos de Ambache a partir de 1955, que demostraron que la sustancia a la que denominó Irin, era un compuesto de prostaglandinas E y F, se conoce que ellas son las responsables, a través de su presencia en la cámara anterior, de la hiperemia conjuntival, miosis, aumento del contenido proteico en el humor acuoso, disrupción de la barrera hemato-ocular y aumento de la presión intraocular. Efectuamos una revisión bibliográfica; propiciamos el uso de antinflamatorios no esteroideos, como inhibidores de la "PG" y presentamos una fórmula de aspirina soluble de uso tópico (AU)


Assuntos
Aspirina/uso terapêutico , Câmara Anterior , Hiperemia/tratamento farmacológico , Prostaglandinas E/farmacologia , Prostaglandinas F/farmacologia
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