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1.
J Food Drug Anal ; 26(4): 1253-1264, 2018 10.
Artigo em Inglês | MEDLINE | ID: mdl-30249324

RESUMO

Adipose tissue is one of the major organs responsible for rapid restoration of postprandial glucose fluxes. Being the major isoform of glucose transporter in adipose tissue, regulations of insulin-dependent GLUT4 trafficking have always been of research interest. The present study aimed to examine the molecular mechanisms underlying the efficacy of curculigoside and polyphenol-rich ethyl acetate fraction (EAF) of Molineria latifolia rhizome in triggering glucose uptake. We assessed the adipogenic potential and glucose uptake stimulatory activity of curculigoside and EAF by employing a murine 3T3-L1 adipocyte model. The transcriptional and translational expressions of selected intermediates in the insulin signalling pathway were evaluated. While curculigoside neither promoted adipogenesis nor activated peroxisome proliferator activated receptor gamma, treatment with polyphenol-rich EAF resulted otherwise. However, both treatments enhanced insulin-stimulated uptake of glucose. This was coupled with increased availability of GLUT4 at the plasma membrane of the differentiated adipocytes although the total GLUT4 protein level was unaffected. In addition, the treatment increased the phosphorylation of both AKT and mTOR, which have been reported to be associated with GLUT4 translocation. The present findings proposed that curculigoside and EAF increased glucose transport activity of 3T3-L1 adipocytes via GLUT4 translocation as a result of potential mTOR/AKT activation. The more potent efficacy observed with EAF suggested potential synergistic and multi-targeted action.


Assuntos
Adipócitos/efeitos dos fármacos , Benzoatos/farmacologia , Transportador de Glucose Tipo 4/metabolismo , Glucosídeos/farmacologia , Hypoxidaceae/química , Extratos Vegetais/farmacologia , Polifenóis/farmacologia , Proteínas Proto-Oncogênicas c-akt/metabolismo , Serina-Treonina Quinases TOR/metabolismo , Adipócitos/metabolismo , Animais , Glucose/metabolismo , Transportador de Glucose Tipo 4/genética , Camundongos , Células NIH 3T3 , Transporte Proteico/efeitos dos fármacos , Proteínas Proto-Oncogênicas c-akt/genética , Rizoma/química , Transdução de Sinais/efeitos dos fármacos , Serina-Treonina Quinases TOR/genética
2.
Food Chem Toxicol ; 119: 290-295, 2018 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-29596974

RESUMO

The present investigation was carried out to evaluate the antioxidant and cytotoxic activities of Pancratium triflorum Roxb and Molineria trichocarpa were collected from South Vagaikulam, Tirunelveli district, Tamil Nadu, India. The antioxidant activities of P. triflorum extracts were as follows with the IC50 values methanol (228.13 µg/mL) > chloroform (311.33 µg/mL) > acetone (398.08 µg/mL) > petroleum ether (410.16 µg/mL). The antioxidant activities of P. triflorum and M. trichocarpa extracts were as follows with the IC50 values methanol (80.93 µg/mL) > acetone (98.02 µg/mL) > chloroform (186.84 µg/mL) > petroleum ether (209.64 µg/mL). Among the various extracts of P. triflorum, methanolic extracts showed the strongest phosphomolybdenum reduction (140.56 g AA/100 g). Among the tested extracts, acetone extracts of M. trichocarpa showed maximum inhibition with 71.36 ±â€¯5.86%. In P. triflorum, chloroform extracts showed maximum inhibition (69.51%). The petroleum ether extract of M. trichocarpa was found to be most effective at which 50% mortality (LC50) and 90% mortality (LC90) of brine shrimp nauplii were found to be 29.22 and 184.82 mg/mL. This study results revealed the antioxidant and cytotoxic properties of P. triflorum and M. trichocarpa. Further investigations are needed to isolate and validate the active principles of the extract responsible various pharmacological properties.


Assuntos
Amaryllidaceae/química , Antioxidantes/farmacologia , Sobrevivência Celular/efeitos dos fármacos , Hypoxidaceae/química , Extratos Vegetais/farmacologia , Animais , Artemia/efeitos dos fármacos , Flavonoides/análise , Concentração Inibidora 50 , Fenóis/análise
3.
Biomed Pharmacother ; 98: 125-133, 2018 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-29248832

RESUMO

This study aimed to evaluate the effect of ethyl acetate fraction (EAF) isolated from Molineria latifolia rhizome as dietary interventions for type 2 diabetes mellitus (T2DM) and its underlying molecular mechanisms in vivo. Experimental rats were induced by high fat diet feeding coupled with combined exposure to streptozotocin and nicotinamide. Treatment with EAF improved glucose tolerance and lipid profiles, but the insulin secretion was unaltered. Gene expression analyses on insulin/adipocytokine signalling-related genes demonstrated tissue-specific transcriptional responses. In skeletal muscle and liver tissues, Socs1, Tnf and Mapk8 showed consistent transcript regulation. Furthermore, hepatic translational analyses revealed sensitization on proximal insulin signalling, with reduced expression of IRS1 serine phosphorylation, increased IRS1 tyrosine phosphorylation and increased phospho-AKT (Ser473). The present findings suggested that EAF exerted its effect by modulating insulin signalling, potentially via IRS1/AKT activation. The pharmacological attributes of EAF may implicate its potential therapeutic applications for diabetes management.


Assuntos
Diabetes Mellitus Experimental/tratamento farmacológico , Hypoxidaceae/química , Proteínas Substratos do Receptor de Insulina/metabolismo , Resistência à Insulina/fisiologia , Extratos Vegetais/farmacologia , Polifenóis/farmacologia , Proteínas Proto-Oncogênicas c-akt/metabolismo , Acetatos/química , Animais , Glicemia/efeitos dos fármacos , Diabetes Mellitus Experimental/metabolismo , Diabetes Mellitus Tipo 2/tratamento farmacológico , Diabetes Mellitus Tipo 2/metabolismo , Dieta Hiperlipídica/efeitos adversos , Insulina/metabolismo , Fígado/efeitos dos fármacos , Fígado/metabolismo , Masculino , Fosforilação/efeitos dos fármacos , Ratos , Ratos Sprague-Dawley , Transdução de Sinais/efeitos dos fármacos , Estreptozocina/farmacologia
4.
J Diabetes Res ; 2016: 4602820, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-27437404

RESUMO

Diabetes mellitus (DM) belongs to the group of five leading important diseases causing death globally and remains a major health problem in Africa. A number of factors such as poverty, poor eating habit, and hormonal imbalance are responsible for the occurrence of the disease. It poses a major health challenge in Africa continent today and the prevalence continues to increase at an alarming rate. Various treatment options particularly the usage of herbs have been effective against diabetes because they have no adverse effects. Interestingly, South Africa, especially the Basotho tribe, is blessed with numerous medicinal plants whose usage in the treatment of DM has been effective since the conventional drugs are expensive and often unaffordable. The present study attempted to update the various scientific evidence on the twenty-three (23) plants originating from different parts of the world but widely used by the Sotho people in the management of DM. Asteraceae topped the list of sixteen (16) plant families and remained the most investigated according to this review. Although limited information was obtained on the antidiabetic activities of these plants, it is however anticipated that government parastatals and scientific communities will pay more attention to these plants in future research.


Assuntos
Diabetes Mellitus/tratamento farmacológico , Hipoglicemiantes/uso terapêutico , Preparações de Plantas/uso terapêutico , Plantas Medicinais , Aloe , Apocynaceae , Asparagus (Planta) , Asteraceae , Cannabis , Commelina , Fabaceae , Humanos , Hypoxidaceae , Hypoxis , Malvaceae , Mimulus , Myricaceae , Rubiaceae , Rumex , África do Sul , Xanthorrhoeaceae
5.
Molecules ; 21(6)2016 Jun 17.
Artigo em Inglês | MEDLINE | ID: mdl-27322226

RESUMO

Increasing evidence from both experimental and clinical studies depicts the involvement of oxidative stress in the pathogenesis of various diseases. Specifically, disruption of homeostatic redox balance in accumulated body fat mass leads to obesity-associated metabolic syndrome. Strategies for the restoration of redox balance, potentially by exploring potent plant bioactives, have thus become the focus of therapeutic intervention. The present study aimed to bioprospect the potential use of the curculigoside-cinnamic acid-rich fraction from Molineria latifolia rhizome as an antioxidant therapeutic agent. The ethyl acetate fraction (EAF) isolated from M. latifolia rhizome methanolic extract (RME) contained the highest amount of phenolic compounds, particularly curculigoside and cinnamic acid. EAF demonstrated glycation inhibitory activities in both glucose- and fructose-mediated glycation models. In addition, in vitro chemical-based and cellular-based antioxidant assays showed that EAF exhibited high antioxidant activities and a protective effect against oxidative damage in 3T3-L1 preadipocytes. Although the efficacies of individual phenolics differed depending on the structure and concentration, a correlational study revealed strong correlations between total phenolic contents and antioxidant capacities. The results concluded that enriched phenolic contents in EAF (curculigoside-cinnamic acid-rich fraction) contributed to the overall better reactivity. Our data suggest that this bioactive-rich fraction warrants therapeutic potential against oxidative stress-related disorders.


Assuntos
Antioxidantes/química , Hypoxidaceae/química , Estresse Oxidativo/efeitos dos fármacos , Extratos Vegetais/química , Células 3T3-L1 , Animais , Antioxidantes/administração & dosagem , Benzoatos/administração & dosagem , Benzoatos/química , Cinamatos/administração & dosagem , Cinamatos/química , Flavonoides/química , Glucosídeos/administração & dosagem , Glucosídeos/química , Camundongos , Oxirredução , Fenóis/química , Picratos/química , Extratos Vegetais/administração & dosagem , Rizoma/química
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