Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 6 de 6
Filtrar
Mais filtros










Intervalo de ano de publicação
1.
Ars pharm ; 62(1): 40-51, ene.-mar. 2021. tab, graf
Artigo em Inglês | IBECS-Express | IBECS | ID: ibc-ET6-1767

RESUMO

INTRODUCTION: Several natural products exhibit promising antineoplastic activity against bladder cancer cells, including allyl isothiocyanate (AITC). However, the AITC irritates the mucous membranes and induces eczematous or vesicular skin reactions. Thus, pharmaceutical formulations are necessary to overcome these problems. The aim was to develop micellar solutions containing AITC and investigate their antitumoral activity in bladder carcinoma cell lines. METHOD: The micellar solutions were prepared by cold dispersion method. Subsequently, we evaluated cytotoxicity, cell proliferation, cell cycle kinetics and long-term effects of micelles in bladder cancer cells. RESULTS: Cytotoxicity and cell proliferation assays showed there was an increase in AITC activity when it was encapsulated in micelles. We also observed cell cycle arrest in the S phase after treatment with AITC-micelles. Furthermore, the formulation was able to maintain the long-term effects of free AITC. CONCLUSIONS: The micellar solutions developed can become an interesting approach for administration of AITC in the treatment of bladder cancer


INTRODUCCIÓN: Varios productos naturales exhiben actividad antineoplásica prometedora contra las células can¬cerosas de vejiga, incluido el isotiocianato de alilo (AITC). Sin embargo, el AITC irrita las membranas mucosas e induce reacciones cutáneas vesiculares o eccematosas. Por tanto, las formulaciones farmacéuticas son necesarias para superar estos problemas. El objetivo era desarrollar soluciones micelares que contengan AITC e investigar su actividad antitumoral en líneas celulares de carcinoma de vejiga. MÉTODO: Las soluciones micelares se prepararon mediante el método de dispersión en frío. Posteriormente, eval¬uamos la citotoxicidad, la proliferación celular, la cinética del ciclo celular y los efectos a largo plazo de las micelas en las células del cáncer de vejiga. RESULTADOS: Los ensayos de citotoxicidad y proliferación celular mostraron que hubo un aumento en la actividad de AITC cuando se encapsuló en micelas. También observamos la detención del ciclo celular en la fase S después del tratamiento con micelas AITC. Además, la formulación pudo mantener los efectos a largo plazo del AITC libre. CONCLUSIONES: Las soluciones micelares desarrolladas pueden convertirse en un enfoque interesante para la ad¬ministración de AITC en el tratamiento del cáncer de vejiga

2.
Int J Biol Macromol ; 169: 330-341, 2020 Dec 10.
Artigo em Inglês | MEDLINE | ID: mdl-33310092

RESUMO

Vancomycin-loaded N,N-dodecyl,methyl-polyethylenimine nanoparticles coated with hyaluronic acid (VCM-DMPEI nanoparticles/HA) were synthesized as an adjuvant for the treatment of bacterial endophthalmitis. The nanoparticles were formulated by experimental statistical design, thoroughly characterized, and evaluated in terms of bactericidal activity and both in vitro and in vivo ocular biocompatibility. The VCM-DMPEI nanoparticles/HA were 154 ± 3 nm in diameter with a 0.197 ± 0.020 polydispersity index; had a + 26.4 ± 3.3 mV zeta potential; exhibited a 93% VCM encapsulation efficiency; and released 58% of the encapsulated VCM over 96 h. VCM and DMPEI exhibited a synergistic bactericidal effect. The VCM-DMPEI nanoparticles/HA were neither toxic to ARPE-19 cells nor irritating to the chorioallantoic membrane. Moreover, the VCM-DMPEI nanoparticles/HA did not induce modifications in retinal functions, as determined by electroretinography, and in the morphology of the ocular tissues. In conclusion, the VCM-DMPEI nanoparticles/HA may be a useful therapeutic adjuvant to treat bacterial endophthalmitis.

3.
Free Radic Biol Med ; 159: 54-65, 2020 Nov 01.
Artigo em Inglês | MEDLINE | ID: mdl-32745772

RESUMO

Recently, there has been a demand for the replacement of chemical sunscreens with natural compounds that could prevent or restore UV-induced skin damage. Here, we investigated the photoprotective influence of the Melaleuca leucadendron ethanolic flower extract (EEMec) on factors involved in cellular and molecular UVB-induced oxidative stress in human skin keratinocytes (HaCaT). The phytochemical constituents, antioxidant potential by DPPH assay, content of total phenolic and flavonoid compounds in EEMec were evaluated. HaCaT cells were treated with EEMec followed by irradiation with UVB. CAT activity; GSH and ROS levels; and SOD1, GPx, CAT and COX-2 expression assays were employed to verify the oxidative stress, as well as EEMec effect on transmembrane transport, and pro-inflammatory and pro-apoptotic protein expression. EEMec reverted the viability loss of HaCaT cells after irradiation with UVB, exhibited significant antioxidant capacity and free radical scavenging activity in vitro, inhibited COX-2 expression and ensure protection of DNA-damage. EEMec shown a great photoprotective property to prevent keratinocytes damage induced by UV radiation and, thus a candidate potential to application as an adjuvant in sunscreen formulations as a strategy to reduce risk of sunburn and prevent skin diseases associated with UV-induced inflammation and cancer.

4.
Eur J Pharm Sci ; 151: 105382, 2020 Aug 01.
Artigo em Inglês | MEDLINE | ID: mdl-32470575

RESUMO

Malaria treatment is based on a reduced number of antimalarial drugs, and drug resistance has emerged, leading to the search for new antimalarial drugs incorporated into pharmaceutical formulations. In this study, 10-(4,5-dihydrothiazol-2-yl)thio)decan-1-ol) (thiazoline), a synthetic analog of 3-alkylpiridine marine alkaloid, and a potent antimalarial substance, was incorporated into O/W nanoemulsion. This formulation was prepared by a 23 factorial design. It was characterized by globule diameter, polydispersity index, zeta potential, encapsulation efficiency, in vitro thiazoline release at pH 2 and 6.86, and accelerated stability. In vitro and in vivo antimalarial activity was determined against P. falciparum and P. berghei, respectively. Thiazoline nanoemulsion showed 248.8 nm of globule diameter, 0.236 of polydispersity index, -38.5 mV of zeta potential, 96.92% encapsulation efficiency, and it was stable for 6 months. Thiazoline release profiles differed in acidic and neutral media, but in both cases, the nanoemulsion controlled and prolonged the thiazoline delivery. Thiazoline nanoemulsion exerted in vitro antimalarial activity against the parasite (IC50 = 1.32 µM), and it significantly reduced the in vivo parasitemia for 8 days without increasing the survival time of animals. Therefore, the thiazoline nanoemulsion represents a strategy to treat malaria combining an antimalarial candidate and a new nanocarrier.

5.
Data Brief ; 29: 105311, 2020 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-32211458

RESUMO

Data described in this article are related to the research article entitled "Amphotericin B-loaded Eudragit RL100 nanoparticles coated with hyaluronic acid (AMP EUD nanoparticles/HA) for the treatment of vulvovaginal candidiasis" [1]. In this work, we report original data on the statistical experimental design to formulate uncoated AMP EUD nanoparticles, data on the validation of spectrophotometric method to quantify the AMP released from uncoated EUD nanoparticles and coated with HA to obtain the in vitro drug release profiles as well as the drug encapsulation efficiency. In addition, we describe original data on characterization, including diameter size, polydispersity index, zeta potential, FTIR, DSC/TG, and XRD; data on diameter of in vitro inhibition halos of Candida albicans; and on the vaginal burden of infected animals treated with uncoated AMP EUD nanoparticles and AMP EUD nanoparticles/HA. Finally, different histological sections of endocervix collected from treated and untreated animals were inserted into this manuscript.

6.
Parasitol Res ; 117(9): 2881-2893, 2018 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-29943317

RESUMO

Strains of the same Leishmania parasite species, isolated from different host organisms, may exhibit unique infection profiles and induce a change in the expression of microRNAs among host macrophages and in model host mice. MicroRNAs (MiR) are endogenous molecules of about 22 nucleotides that are involved in many regulatory processes, including the vertebrate host immune response. In this respect, the infectivity and susceptibility to antimonials of two L. infantum strains, BH46, isolated from human, and OP46, isolated from symptomatic dog, were characterized in J774 macrophages and BALB/c mice. Parasite burden was assessed in the liver, spleen, and bone marrow using the serial limiting dilution technique. A higher parasite burden was observed in the spleen and bone marrow of animals infected with OP46 compared to BH46 strain. Our results also showed that OP46 was less susceptible to the antimonials. In addition, miR-122 and miR-155 expression was evaluated in the liver and J774 macrophages, and in spleens from infected animals, respectively. An increase was observed in the expression of miR-155 in J774 macrophages infected with both strains compared to uninfected cells, with a higher expression in cells infected with OP46. However, no difference in the expression of miR-122 and miR-155 was observed in the infected animals. Thus, this study shows that OP46 was more infective for mice, it caused a higher increase in miR-155 expression in infected macrophages and was less susceptible to the antimonials evaluated. These data suggest that alteration in miR-155 level likely plays a role in regulating the response to L. infantum.


Assuntos
Tartarato de Antimônio e Potássio/uso terapêutico , Antiparasitários/uso terapêutico , Leishmania infantum/efeitos dos fármacos , Leishmaniose Visceral/tratamento farmacológico , Meglumina/uso terapêutico , MicroRNAs/biossíntese , Compostos Organometálicos/uso terapêutico , Animais , Medula Óssea/parasitologia , Modelos Animais de Doenças , Cães , Feminino , Perfilação da Expressão Gênica , Humanos , Leishmania infantum/genética , Leishmania infantum/isolamento & purificação , Leishmaniose Visceral/parasitologia , Fígado/parasitologia , Macrófagos/parasitologia , Antimoniato de Meglumina , Camundongos , Camundongos Endogâmicos BALB C , MicroRNAs/genética , Carga Parasitária , Baço/parasitologia
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA