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2.
Food Technol Biotechnol ; 60(3): 375-385, 2022 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-36320353

RESUMEN

Research background: Morinda citrifolia L. (noni), Ananas comosus L. cv. Sarawak (pineapple) and Mangifera indica L. cv. Apple (mango) represent fruits capable of coagulating milk and forming a curd. Plant-derived milk coagulants have antidiabetic phytochemicals that enrich the curd. Hence this work evaluates the dual benefits of the fruits in coagulating milk and the antidiabetic activities found in the obtained curd. Experimental approach: The three fruits were mixed to form a supercoagulant (a milk coagulant mixture of the extracts at a ratio of 1:1:1), and the milk coagulation time was measured. The milk was coagulated by the supercoagulant, and thus fortified curd was tested for its ability to inhibit α-glucosidase and α-amylase activities. Then, the fortified curd was fed daily to streptozotocin-induced diabetic rats and their biochemical markers such as blood glucose level, aspartate aminotransferase, alanine transaminase, etc. as well as histopathology of their liver and kidney tissues were compared with the untreated diabetic rats and normal rats. Results and conclusion: The supercoagulant had a milk coagulation time of (28±3) s at a 50 mg/mL concentration. Its fortified curd inhibited α-glucosidase and α-amylase activities, with IC50 values of (4.04±0.03) and (3.42±0.02) mg/mL, respectively. The average mass of the streptozotocin-induced diabetic rats fed daily with curd formed by the supercoagulant was (201±10) g on day 20 compared to diabetic control rats with (149±16) g. The blood glucose concentration for rats treated with the supercoagulant after fasting was (15±1) mmol/L compared to the diabetic control rats ((26±2) mmol/L). Blood tests on the treated rats showed aspartate aminotransferase, alanine transaminase, γ-glutamyl transferase and alkaline phosphatase (liver function tests) amounts of (214±78), (91±13), 3 and (510±138) U/L, respectively, while the total protein and renal function tests showed the concentrations of albumin, globulin, urea and creatinine of (37±2) g/L, (30±2) g/L, (11±1) mmol/L and (42±3) µmol/L, respectively. These concentrations were found to be similar to those of the normal rats on day 20. Furthermore, a histopathological study performed on the liver and kidney of the rats found no apparent damage. Novelty and scientific contribution: This supercoagulant derived from a mixture of fruits is able to coagulate milk rapidly, and its curd is fortified with safe antidiabetic agents. The supercoagulant is potentially useful in producing functional dairy food to prevent diabetes or as a supplement for diabetics to control their blood sugar. Such products are capable of replacing dairy products derived from animal enzymes and provide consumers with additional functional dairy products.

3.
PhytoKeys ; 211: 81-92, 2022.
Artículo en Inglés | MEDLINE | ID: mdl-36760727

RESUMEN

Two new species of Boesenbergia, B.sugudensis sp. nov. and B.truncata sp. nov. were discovered in Sabah, Malaysian Borneo. Boesenbergiasugudensis resembles B.imbakensis in that the leaf sheath of the plant is not thickened and in the anther thecae dehiscing by longitudinal slits, but differs in having a longer petiole and tubular calyx. Boesenbergiatruncata resembles B.orbiculata by the short petiole and a bilobed calyx, but differs by the truncate leaf base, the acute leaf apex, opposite leaves with a narrower lamina parallel to the ground and anther thecae dehiscing by pores. The new species are described and illustrated in detail.

4.
Chem Biodivers ; 16(6): e1900032, 2019 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-30957403

RESUMEN

The inhibition of carbohydrate-hydrolyzing enzymes in human digestive organs is crucial in controlling blood sugar levels, which is important in treating type 2 diabetes. In the current study, pahangensin A (1), a bis-labdanic diterpene characterized previously in the rhizomes of Alpinia pahangensis Ridl., was identified as an active dual inhibitor for α-amylase (IC50 =114.80 µm) and α-glucosidase (IC50 =153.87 µm). This is the first report on the dual α-amylase and α-glucosidase inhibitory activities of a bis-labdanic diterpene. The Lineweaver-Burk plots of compound 1 indicate that it is a mixed-type inhibitor with regard to both enzymes. Based on molecular docking studies, compound 1 docked in a non-active site of both enzymes. The dual inhibitory activity of compound 1 makes it a suitable natural alternative in the treatment of type 2 diabetes.


Asunto(s)
Alpinia/química , Diterpenos/química , alfa-Amilasas/metabolismo , alfa-Glucosidasas/metabolismo , Alpinia/metabolismo , Sitios de Unión , Dominio Catalítico , Diterpenos/aislamiento & purificación , Diterpenos/metabolismo , Inhibidores Enzimáticos/química , Inhibidores Enzimáticos/metabolismo , Cinética , Simulación del Acoplamiento Molecular , Extractos Vegetales/química , alfa-Amilasas/antagonistas & inhibidores , alfa-Glucosidasas/química
6.
PhytoKeys ; (73): 117-124, 2016.
Artículo en Inglés | MEDLINE | ID: mdl-27872559

RESUMEN

Globba magnibracteata Y.Y.Sam, sp. nov. is described and illustrated. Colour plates, a preliminary conservation assessment and a discussion of its closely related taxa are provided.

7.
PhytoKeys ; (75): 31-55, 2016.
Artículo en Inglés | MEDLINE | ID: mdl-28127243

RESUMEN

A new genus from Borneo, Borneocola Y.Y.Sam, is described here. The genus currently contains eight species previously classified as members of the Scaphochlamys Baker. The finding is based on the results of the morphological and molecular studies of Scaphochlamys throughout its geographical range and its closely allied sister groups, Distichochlamys M.F.Newman and Myxochlamys A.Takano & Nagam. Borneocola is nested within the tribe Zingibereae and its monophyly is strongly supported by both ITS and matK sequence data. The genus is characterised by several thin, translucent and marcescent floral bracts, absence of coloured streaks on the labellum and capitate stigma with two dorsal knobs. The genus is distributed in northwest Borneo and all species are very rare and highly endemic.

8.
Oncotarget ; 6(18): 16151-67, 2015 Jun 30.
Artículo en Inglés | MEDLINE | ID: mdl-26158863

RESUMEN

PURPOSE: Previous in vitro and in vivo studies have reported that 1'-S-1'-acetoxychavicol acetate (ACA) isolated from rhizomes of the Malaysian ethno-medicinal plant Alpinia conchigera Griff (Zingiberaceae) induces apoptosis-mediated cell death in tumour cells via dysregulation of the NF-κB pathway. However there were some clinical development drawbacks such as poor in vivo solubility, depreciation of biological activity upon exposure to an aqueous environment and non-specific targeting of tumour cells. In the present study, all the problems above were addressed using the novel drug complex formulation involving recombinant human alpha fetoprotein (rhAFP) and ACA. EXPERIMENTAL DESIGN: To study the synergistic effect of both agents on human cancer xenografts, athymic nude (Nu/Nu) mice were used and treated with various combination regimes intraperitoneally. Serum levels of tumour markers for carcinoembryonic antigen (CEA) and prostate specific antigen (PSA) were assessed using sandwich ELISA. IHC and Western blotting were also conducted on in vivo tumour biopsies to investigate the involvement of NF-κB regulated genes and inflammatory biomarkers. Quantification and correlation between drug efficacies and AFP-receptors were done using IF-IC and Pearson's correlation analysis. RESULTS: Mice exposed to combined treatments displayed higher reductions in tumour volume compared to stand alone agents, consistent with in vitro cytotoxicity assays. Milder signs of systemic toxicity, such as loss in body weight and inflammation of vital organs were also demonstrated compared to stand alone treatments. Tumour marker levels were consistent within all rhAFP/ACA treatment groups where levels of CEA and PSA were initially elevated upon commencement of treatment, and consecutively reduced corresponding to a decrease in tumour bulk volume. Both IHC and Western blotting results indicated that the combined action of rhAFP/ACA was not only able to down-regulate NF-κB activation, but also reduce the expression of NF-κB regulated genes and inflammatory biomarkers. The efficacy of rhAFP/ACA complex was also found to be weakly negatively correlated to the level of surface AFP-receptors between tumour types. CONCLUSIONS: This drug complex formulation shows great therapeutic potential against AFP-receptor positive tumours, and serves as a basis to overcome insoluble and non-specific anti-neoplastic molecules.


Asunto(s)
Alpinia/química , Alcoholes Bencílicos/farmacología , Neoplasias/terapia , Receptores de Péptidos/metabolismo , Proteínas Recombinantes/metabolismo , alfa-Fetoproteínas/farmacología , Animales , Apoptosis , Western Blotting , Movimiento Celular , Proliferación Celular , Terapia Combinada , Sistemas de Liberación de Medicamentos , Ensayo de Inmunoadsorción Enzimática , Técnica del Anticuerpo Fluorescente , Humanos , Técnicas para Inmunoenzimas , Ratones , FN-kappa B/metabolismo , Neoplasias/metabolismo , Neoplasias/patología , Proteínas Recombinantes/genética , Transducción de Señal , Células Tumorales Cultivadas
9.
J Insect Sci ; 15: 175, 2015.
Artículo en Inglés | MEDLINE | ID: mdl-25688085

RESUMEN

Dual choice bioassays were used to evaluate the antifeedant property of essential oil and methanolic extract of Alpinia galanga (L.) (locally known as lengkuas) against two species of termites, Coptotermes gestroi (Wasmann) and Coptotermes curvignathus (Holmgren) (Isoptera: Rhinotermitidae). A 4-cm-diameter paper disc treated with A. galanga essential oil and another treated with either methanol or hexane as control were placed in a petri dish with 10 termites. Mean consumption of paper discs (miligram) treated with 2,000 ppm of essential oil by C. gestroi was 3.30 ± 0.24 mg and by C. curvignathus was 3.32 ± 0.24 mg. A. galanga essential oil showed significant difference in antifeedant effect, 2,000 ppm of A. galanga essential oil was considered to be the optimum concentration that gave maximum antifeedant effect. The essential oil composition was determined using gas chromatography-mass spectrometry. The major component of the essential oil was 1,8-cineol (61.9%). Antifeedant bioassay using 500 ppm of 1,8-cineol showed significant reduction in paper consumption by both termite species. Thus, the bioactive agent in A. galangal essential oil causing antifeeding activity was identified as 1,8-cineol. Repellent activity shows that 250 ppm of 1,8-cineol caused 50.00 ± 4.47% repellency for C. gestroi, whereas for C. curvignathus 750 ppm of 1,8-cineol was needed to cause similar repellent activity (56.67 ± 3.33%). C. curvignathus is more susceptible compare to C. gestroi in Contact Toxicity study, the lethal dose (LD50) of C. curvignathus was 945 mg/kg, whereas LD50 value for C. gestroi was 1,102 mg/kg. Hence 1,8-cineol may be developed as an alternative control against termite in sustainable agriculture practices.


Asunto(s)
Alpinia/química , Control de Insectos/métodos , Insecticidas/farmacología , Isópteros/efectos de los fármacos , Aceites Volátiles/farmacología , Extractos Vegetales/farmacología , Alpinia/fisiología , Animales , Ciclohexanoles/farmacología , Eucaliptol , Repelentes de Insectos/farmacología , Isópteros/fisiología , Monoterpenos/farmacología , Rizoma/química , Rizoma/fisiología
10.
ScientificWorldJournal ; 2014: 430831, 2014.
Artículo en Inglés | MEDLINE | ID: mdl-24987733

RESUMEN

The essential oils obtained by hydrodistillation of the unripe and ripe fruits of Alpinia mutica Roxb. and Alpinia latilabris Ridl. were analysed by capillary GC and GC-MS. The oils were principally monoterpenic in nature. The unripe and ripe fruit oils of A. mutica were characterized by camphor (21.0% and 15.8%), camphene (16.6% and 10.2%), ß-pinene (8.6% and 13.5%), and trans,trans-farnesol (8.0% and 11.2%), respectively. The oils of the unripe and ripe fruits were moderately active against Staphylococcus aureus, Bacillus subtilis, Trichophyton mentagrophytes, and Trichophyton rubrum. 1,8-Cineole (34.2% and 35.9%) and ß-pinene (20.2% and 19.0%) were the two most abundant components in the unripe and ripe fruit oils of A. latilabris. The oil of the unripe fruits elicits moderate activity against Staphylococcus aureus and Trichophyton mentagrophytes while Candida glabrata was moderately sensitive to the oil of the ripe fruits.


Asunto(s)
Alpinia/química , Antiinfecciosos/química , Antiinfecciosos/farmacología , Aceites Volátiles/química , Aceites Volátiles/farmacología , Antiinfecciosos/aislamiento & purificación , Malasia , Pruebas de Sensibilidad Microbiana , Aceites Volátiles/aislamiento & purificación , Componentes Aéreos de las Plantas/genética
11.
Pharmacogn Mag ; 10(37): 70-2, 2014 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-24695515

RESUMEN

BACKGROUND: Alpinia murdochii (Zingiberaceae) is a wild ginger species restricted to mountain areas of Peninsular Malaysia. Due to rapid development and deforestation activities, this species is becoming rare. This is the first report of the cytotoxic activity of A. murdochii. OBJECTIVE: The present study aimed to investigate the cytotoxic effect of leaves and rhizomes of A. murdochii against selected human cancer cell lines by using in vitro cytotoxicity assay. MATERIALS AND METHODS: The leaves and rhizomes of A. murdochii were extracted in hexane, dichloromethane (CH2Cl2), and methanol (MeOH) prior to cytotoxic activity assessment against selected human cancer cell lines, namely MCF7 (hormone dependent breast carcinoma cell line), HT29 (colon carcinoma cell line), and SKOV-3 (ovarian cancer cell line) by using in vitro neutral red cytotoxicity assay. RESULTS: The hexane and CH2Cl2 extracts of both leaves and rhizomes exhibited remarkable cytotoxic effect against SKOV-3 cells with the IC50 values in the range of 5.2-16.7 µg/ml. CONCLUSION: Based on the preliminary data obtained in the present study, the leaves and rhizomes of A. murdochii may be viable therapeutic or preventive candidates for the treatment of ovarian cancer.

12.
J Venom Anim Toxins Incl Trop Dis ; 20(1): 6, 2014 Mar 04.
Artículo en Inglés | MEDLINE | ID: mdl-24593956

RESUMEN

BACKGROUND: Naja kaouthia, Ophiophagus hannah, Bungarus fasciatus and Calloselasma rhodostoma are four venomous snakes indigenous to Malaysia. In the present study, their proteomic profile by two-dimensional gel electrophoresis (2-DE) have been separated and compared. RESULTS: The 2-DE of venoms of the four species snake demonstrated complexity and obvious interspecies differences in proteome profiles. A total of 63 proteins were identified in the four species: C. rhodostoma - 26, N. kaouthia - 16, O. hannah - 15 and B. fasciatus - 6. CONCLUSIONS: Despite the identifications of major proteins in the four snake species, a large number of protein spots from the 2-DE were unidentified even though the spots displayed high-quality MALDI-TOF-MS spectra. Those identified included phospholipase A2 proteins in all four venoms, long neurotoxins in both cobra species and the C. rhodostoma venom found with the most varied types of peptidases, i.e. metalloproteinase kistomin, halystase and L-amino acid oxidase.

13.
J. venom. anim. toxins incl. trop. dis ; 20: 1-9, 04/02/2014. ilus, tab
Artículo en Inglés | LILACS, VETINDEX | ID: biblio-1484563

RESUMEN

Naja kaouthia, Ophiophagus hannah, Bungarus fasciatus and Calloselasma rhodostoma are four venomous snakes indigenous to Malaysia. In the present study, their proteomic profile by two-dimensional gel electrophoresis (2-DE) have been separated and compared.


Asunto(s)
Animales , Alismatales/clasificación , Análisis Espectral/métodos , Mordeduras de Serpientes , Proteínas Neurotóxicas de Elápidos/análisis , Venenos/análisis
14.
Artículo en Inglés | LILACS | ID: lil-724674

RESUMEN

Naja kaouthia, Ophiophagus hannah, Bungarus fasciatus and Calloselasma rhodostoma are four venomous snakes indigenous to Malaysia. In the present study, their proteomic profile by two-dimensional gel electrophoresis (2-DE) have been separated and compared.


Asunto(s)
Animales , Alismatales/clasificación , Análisis Espectral/métodos , Proteínas Neurotóxicas de Elápidos/análisis , Mordeduras de Serpientes , Venenos/análisis
15.
Planta Med ; 79(18): 1775-80, 2013 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-24356874

RESUMEN

The rhizomes of Alpinia pahangensis yielded a new bis-labdanic diterpene for which the name pahangensin C (1) was proposed along with twelve known analogues (2-13). The structure of 1 was elucidated via spectroscopic methods including 1D and 2D NMR techniques and LCMS-IT-TOF analysis. Compounds 2 and 12 were isolated for the first time from the genus Alpinia. This is the second occurrence of compounds 2 and 12 in the Zingiberaceae family. Selected analogues exhibited moderate to strong inhibitory activity against Staphylococcus aureus and Bacillus cereus.


Asunto(s)
Alpinia/química , Bacillus cereus/efectos de los fármacos , Diterpenos/aislamiento & purificación , Extractos Vegetales/aislamiento & purificación , Rizoma/química , Staphylococcus aureus/efectos de los fármacos , Antibacterianos , Diterpenos/química , Diterpenos/farmacología , Espectroscopía de Resonancia Magnética , Malasia , Pruebas de Sensibilidad Microbiana , Estructura Molecular , Extractos Vegetales/química , Extractos Vegetales/farmacología
16.
BMC Complement Altern Med ; 13: 314, 2013 Nov 12.
Artículo en Inglés | MEDLINE | ID: mdl-24215354

RESUMEN

BACKGROUND: Alpinia scabra, locally known as 'Lengkuas raya', is an aromatic, perennial and rhizomatous herb from the family Zingiberaceae. It is a wild species which grows largely on mountains at moderate elevations in Peninsular Malaysia, but it can also survive in the lowlands like in the states of Terengganu and Northern Johor. The present study reports the cytotoxic potential of A. scabra extracts from different parts of the plant. METHODS: The experimental approach in the present study was based on a bioassay-guided fractionation. The crude methanol and fractionated extracts (hexane, chloroform and water) from different parts of A. scabra (leaves, rhizomes, roots and pseudo stems) were prepared prior to the cytotoxicity evaluation against human ovarian (SKOV-3) and hormone-dependent breast (MCF7) carcinoma cells. The identified cytotoxic extracts were then subjected to chemical investigations in order to identify the active ingredients. A normal human lung fibroblast cell line (MRC-5) was used to determine the specificity for cancerous cells. The cytotoxic extracts and fractions were also subjected to morphological assessment, DNA fragmentation analysis and DAPI nuclear staining. RESULTS: The leaf (hexane and chloroform) and rhizome (chloroform) extracts showed high inhibitory effect against the tested cells. Ten fractions (LC1-LC10) were yielded after purification of the leaf chloroform extract. Fraction LC4 which showed excellent cytotoxic activity was further purified and resulted in 17 sub-fractions (VLC1-VLC17). Sub-fraction VLC9 showed excellent cytotoxicity against MCF7 and SKOV-3 cells but not toxic against normal MRC-5 cells. Meanwhile, eighteen fractions (RC1-RC18) were obtained after purification of the rhizome chloroform extract, of which fraction RC5 showed cytotoxicity against SKOV-3 cells with high selectivity index. There were marked morphological changes when observed using phase-contrast inverted microscope, DAPI nuclear staining and also DNA fragmentations in MCF7 and SKOV-3 cells after treatment with the cytotoxic extracts and fractions which were indicative of cell apoptosis. Methyl palmitate and methyl stearate were identified in the hexane leaf extract by GC-MS analysis. CONCLUSIONS: The data obtained from the current study demonstrated that the cell death induced by cytotoxic extracts and fractions of A. scabra may be due to apoptosis induction which was characterized by apoptotic morphological changes and DNA fragmentation. The active ingredients in the leaf sub-fraction VLC9 and rhizome fraction RC5 may lead to valuable compounds that have the ability to kill cancer cells but not normal cells.


Asunto(s)
Alpinia/química , Antineoplásicos Fitogénicos/toxicidad , Extractos Vegetales/toxicidad , Antineoplásicos Fitogénicos/aislamiento & purificación , Apoptosis/efectos de los fármacos , Neoplasias de la Mama/tratamiento farmacológico , Neoplasias de la Mama/genética , Neoplasias de la Mama/fisiopatología , Línea Celular Tumoral , Fragmentación del ADN/efectos de los fármacos , Femenino , Humanos , Neoplasias Ováricas/tratamiento farmacológico , Neoplasias Ováricas/genética , Neoplasias Ováricas/fisiopatología , Extractos Vegetales/aislamiento & purificación , Hojas de la Planta/efectos de los fármacos , Rizoma/química
17.
Bioorg Med Chem Lett ; 23(23): 6280-5, 2013 Dec 01.
Artículo en Inglés | MEDLINE | ID: mdl-24144849

RESUMEN

The rhizomes of Alpinia pahangensis Ridley yielded a new bis-labdanic diterpene for which the name pahangensin A (1) was proposed along with a new labdane diterpene, pahangensin B (2). Their structures were elucidated by spectroscopic methods including, 1D and 2D NMR techniques and LCMS-IT-TOF analysis. Pahangensin A (1) was found to be an antibacterial agent against Staphylococcus aureus, Bacillus cereus and Bacillus subtilis with MIC values less than 100 µg/mL, respectively. Pahangensin B (2) exhibited antibacterial activity (MIC <100 µg/mL) against B. cereus.


Asunto(s)
Alpinia/química , Antibacterianos/química , Diterpenos/química , Rizoma/química , Antibacterianos/análisis , Antibacterianos/farmacología , Diterpenos/farmacología , Estereoisomerismo
18.
BMC Complement Altern Med ; 13: 243, 2013 Oct 01.
Artículo en Inglés | MEDLINE | ID: mdl-24083445

RESUMEN

BACKGROUND: Alpinia pahangensis, a wild ginger distributed in the lowlands of Pahang, Malaysia, is used by the locals to treat flatulence. In this study, the antioxidant and cytotoxic activities of the crude aqueous methanol and fractionated extracts of Alpinia pahangensis against five different cancer and one normal cell lines were investigated. The total phenolic content of each extract and its fractions were also quantified. This is the first report on the antioxidant and cytotoxic activities of Alpinia pahangensis extract. METHODS: In the current study, the crude methanol and fractionated extract of the rhizomes of Alpinia pahangensis were investigated for their antioxidant activity using four different assays namely, the DPPH scavenging activity, superoxide anion scavenging, ß-carotene bleaching and reducing power assays whilst their phenolic contents were measured by the Folin-Ciocalteu's method.In vitro neutral red cytotoxicity assay was employed to evaluate the cytotoxic activity against five different cancer cell lines, colon cancer (HCT 116 and HT-29), cervical cancer (Ca Ski), breast cancer (MCF7) and lung cancer (A549) cell lines, and one normal cell line (MRC-5). The extract that showed high cytotoxic activity was further investigated for its chemical constituents by GC-MS (gas chromatography-mass spectrometry) analysis. RESULTS: The ethyl acetate fraction showed the strongest DPPH radical scavenging (0.35 ± 0.094 mg/ml) and SOD activities (51.77 ± 4.9%) whilst the methanol extract showed the highest reducing power and also the strongest antioxidant activity in the ß-carotene bleaching assays in comparison to other fractions. The highest phenolic content was found in the ethyl acetate fraction, followed by the crude methanol extract, hexane and water fractions. The results showed a positive correlation between total phenolic content with DPPH radical scavenging capacities and SOD activities. The hexane fraction showed potent cytotoxic effect against KB, Ca Ski and HCT 116 cell lines with IC50 of 5.8 ± 0.1 and 9.1 ± 2.0 ug/ml, respectively. The major components of hexane fraction analysed by GC-MS analysis were mostly methyl esters. CONCLUSIONS: The current study suggests that the methanol extract and ethyl acetate fraction of A. pahangensis is a potential source of natural antioxidant for protective as well as prevention of life-threatening diseases. The hexane fraction of A. pahangensis may have the potential to be developed into therapeutic option for treating cancer.


Asunto(s)
Alpinia/química , Antioxidantes/farmacología , Neoplasias/tratamiento farmacológico , Fenoles/farmacología , Extractos Vegetales/farmacología , Rizoma/química , Análisis de Varianza , Antioxidantes/química , Compuestos de Bifenilo/análisis , Compuestos de Bifenilo/metabolismo , Línea Celular Tumoral , Supervivencia Celular/efectos de los fármacos , Cromatografía de Gases y Espectrometría de Masas , Células HCT116 , Células HT29 , Humanos , Células MCF-7 , Neoplasias/metabolismo , Neoplasias/patología , Rojo Neutro/análisis , Rojo Neutro/química , Rojo Neutro/metabolismo , Oxidación-Reducción/efectos de los fármacos , Fenoles/análisis , Fenoles/química , Picratos/análisis , Picratos/metabolismo , Extractos Vegetales/química , Superóxidos/análisis , Superóxidos/metabolismo , beta Caroteno/análisis , beta Caroteno/metabolismo
19.
Carbohydr Res ; 375: 90-9, 2013 Jun 28.
Artículo en Inglés | MEDLINE | ID: mdl-23694709

RESUMEN

Konjac glucomannan (KGM) is a natural polysaccharide of ß(1-4)-D-glucomannopyranosyl backbone of D-mannose and D-glucose derived from the tuber of Amorphophallus konjac C. Koch. KGM has been reported to have a wide range of activities including wound healing. In this study we examined KGM extracts prepared from five plant species, (Amorphophallus konjac Koch, Amorphophallus oncophyllus, Amorphophallus prainii, Amorphophallus paeoniifolius and Amorphophallus elegans) for their effects on cultured human keratinocytes and fibroblasts. Extracts from A. konjac Koch, A. oncophyllus and A. prainii (but not from A. paeoniifolius or A. elegans) stimulated fibroblast proliferation both in the absence and presence of serum. However, these materials inhibited keratinocyte proliferation. The fibroblast stimulatory activity was associated with high molecular weight fractions of KGM and was lost following ethanol extraction or enzyme digestion with ß-mannanase. It was also reduced by the addition of concanavalin A but not mannose suggesting that these heteropolysaccharides are acting on lectins but not via receptors specific to mannose. The most dramatic effect of KGM was seen in its ability to support fibroblasts for 3weeks under conditions of deliberate media starvation. This effect did not extend to supporting keratinocytes under conditions of media starvation but KGM did significantly help support adipose derived stem cells under media starvation conditions.


Asunto(s)
Amorphophallus/química , Fibroblastos/efectos de los fármacos , Queratinocitos/efectos de los fármacos , Polisacáridos/química , Polisacáridos/farmacología , Proliferación Celular/efectos de los fármacos , Relación Dosis-Respuesta a Droga , Fibroblastos/citología , Humanos , Queratinocitos/citología , Peso Molecular , Polisacáridos/aislamiento & purificación , Relación Estructura-Actividad
20.
Reprod Sci ; 20(5): 567-78, 2013 May.
Artículo en Inglés | MEDLINE | ID: mdl-23012319

RESUMEN

The aims of this study were to investigate the combined effects of a natural compound 1'S-1'-acetoxychavicol acetate (ACA) with cisplatin (CDDP) on HPV-positive human cervical carcinoma cell lines (Ca Ski-low cisplatin sensitivity and HeLa-high cisplatin sensitivity), and to identify microRNAs (miRNAs) modulated in response toward ACA and/or CDDP. It was revealed that both ACA and CDDP induced dose- and time-dependent cytotoxicity when used as a stand-alone agent, while synergistic effects were observed when used in combination with a combination index (CI) value of 0.74 ± 0.01 and 0.85 ± 0.01 in Ca Ski and HeLa cells, respectively. A total of 25 miRNAs were found to be significantly differentially expressed in response to ACA and/or CDDP. These include hsa-miR-138, hsa-miR-210, and hsa-miR-744 with predicted gene targets involved in signaling pathways regulating apoptosis and cell cycle progression. In conclusion, ACA acts as a chemosensitizer which synergistically potentiates the cytotoxic effect of CDDP in cervical cancer cells. The altered miRNA expression upon administration of ACA and/or CDDP suggests that miRNAs play an important role in anticancer drug responses, which can be manipulated for therapeutic purposes.


Asunto(s)
Protocolos de Quimioterapia Combinada Antineoplásica/farmacología , Carcinoma/genética , Regulación Neoplásica de la Expresión Génica/efectos de los fármacos , MicroARNs/metabolismo , Neoplasias del Cuello Uterino/genética , Alcoholes Bencílicos/farmacología , Carcinoma/patología , Supervivencia Celular/efectos de los fármacos , Cisplatino/farmacología , Relación Dosis-Respuesta a Droga , Sinergismo Farmacológico , Femenino , Células HeLa , Humanos , Factores de Tiempo , Neoplasias del Cuello Uterino/patología
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