RESUMO
The hypoglycaemic activities of four water ethanol extracts (WEE) prepared from Bidens pilosa L., Salvia officinalis L., Psacalium peltatum H.B.K. (Cass) and Turnera diffusa Willd. were investigated in healthy and alloxan-diabetic mice. The WEE of S. officinalis significantly reduced the blood glucose of fasting normal mice 120 (15.7%) and 240 min (30.2%) after intraperitoneal administration (p < 0.05). The WEE of P. peltatum and B. pilosa also significantly diminished glycaemia in healthy mice at 240 min (19.6% and 13.8%, respectively). In mildly diabetic mice, the WEE of P. peltatum lowered the basal blood glucose level 120 (16%) and 240 min (54%) after intraperitoneal administration (p < 0.05 and p < 0.01, respectively). The WEE of B. pilosa and S. officinalis also significantly diminished the hyperglycaemia in mildly diabetic mice at 240 mins (32.6% and 22.7%, respectively). The administration of these three extracts to animals with severe hyperglycaemia did not cause a significant decrease. The WEE of T. diffusa did not show any hypoglycaemic activity. Thus, three of the WEE studied conserved the hypoglycaemic activity originally detected in the traditional preparations of the studied antidiabetic plants. It appears that these extracts require the presence of insulin to show hypoglycaemic activity.
Assuntos
Asteraceae/química , Diabetes Mellitus Experimental/fisiopatologia , Hipoglicemiantes/farmacologia , Extratos Vegetais/farmacologia , Plantas Medicinais/química , Salvia officinalis/química , Turnera/química , Aloxano/farmacologia , Animais , Diabetes Mellitus Experimental/sangue , Diabetes Mellitus Experimental/induzido quimicamente , Diabetes Mellitus Experimental/tratamento farmacológico , Esquema de Medicação , Hipoglicemiantes/química , Hipoglicemiantes/uso terapêutico , Insulina/farmacologia , Masculino , Medicina Tradicional , México , Camundongos , Extratos Vegetais/química , Extratos Vegetais/uso terapêuticoRESUMO
The purpose of this research was to study the anti-hyperglycemic effect of 28 medicinal plants used in the treatment of diabetes mellitus. Each plant was processed in the traditional way and intragastrically administered to temporarily hyperglycemic rabbits. The results showed that eight out of the 28 studied plants significantly decrease the hyperglycemic peak and/or the area under the glucose tolerance curve. These plants were: Guazuma ulmifolia, Tournefortia hirsutissima, Lepechinia caulescens, Rhizophora mangle, Musa sapientum, Trigonella foenum graceum, Turnera diffusa, and Euphorbia prostrata. The results suggest the validity of their clinical use in diabetes mellitus control, after their toxicological investigation.
Assuntos
Diabetes Mellitus Experimental/tratamento farmacológico , Hipoglicemiantes/farmacologia , Plantas Medicinais/química , Animais , Glicemia/metabolismo , Glucose/administração & dosagem , Glucose/farmacologia , Teste de Tolerância a Glucose , Hiperglicemia/induzido quimicamente , Hiperglicemia/tratamento farmacológico , Intubação Gastrointestinal , Masculino , México , Coelhos , Tolbutamida/farmacologiaRESUMO
The effects of Psacalium decompositum, Psacalium peltatum and Acourtia thurberi (Asteraceae) on blood glucose levels were investigated in fasting mice and temporally hyperglycemic rabbits. The root decoction of P. decompositum reduced the blood glucose of normal mice from 49.1 +/- 3.8 to 35.7 +/- 2.0 mg/dl after intraperitoneal administration (P < or = 0.005) and significantly lowered the hyperglycemic peak (17.1%) in rabbits with temporal hyperglycemia. P. peltatum and A. thurberi decoctions also diminished fasting glycemia in mice and hyperglycemia in rabbits, but the effects were minor. A preliminary phytochemical study using thin layer chromatography showed that water decoctions of the three roots contained alkaloids and sugars. P. decompositum and P. peltatum showed the presence of maturine. However, other furoeremophylanes, such as cacalol and cacalone were only present in P. decompositum. A. thurberi root water decoction showed the presence of the benzoquinone perezone, and its derivative pipitzol.
Assuntos
Glicemia/efeitos dos fármacos , Hiperglicemia/tratamento farmacológico , Hipoglicemiantes/uso terapêutico , Extratos Vegetais/uso terapêutico , Plantas Medicinais , Animais , Jejum/sangue , Masculino , México , Camundongos , Extratos Vegetais/análise , CoelhosRESUMO
The anti-hyperglycemic effect of 12 edible plants was studied on 27 healthy rabbits, submitted weekly to subcutaneous glucose tolerance tests after gastric administration of water, tolbutamide or a traditional preparation of the plant. Tolbutamide, Cucurbita ficifolia, Phaseolus vulgaris, Opuntia streptacantha, Spinacea oleracea, Cucumis sativus and Cuminum cyminum decrease significantly the area under the glucose tolerance curve and the hyperglycemic peak. Brassica oleracea var. botrytis, Allium cepa and Allium sativum only decrease the hyperglycemic peak. The glycemic decreases caused by Psidium guajava, Brassica oleracea and Lactuca sativa var. romana were not significant (P > .05). The integration of a menu that includes the edible plants with hypoglycemic activity for the control and prevention of diabetes mellitus may be possible and recommendable.
Assuntos
Hipoglicemiantes/farmacologia , Plantas Comestíveis/química , Animais , Glicemia/metabolismo , Teste de Tolerância a Glucose , Hipoglicemiantes/química , México , Coelhos , Tolbutamida/farmacologiaRESUMO
The objective of this work is to investigate the hypoglycemic effect of 12 "antidiabetic" plants used in Mexico. The studies were performed using 27 healthy rabbits with the gastric administration of water, tolbutamide or decoction of the "antidiabetic" plant before the induction of temporary hyperglycemia by subcutaneous injection of 50% dextrose solution (4 ml/kg of weight) at the beginning of the experiment and after 60 min. Blood glucose was determined every 60 min for a period of 5 h. Tolbutamide and eight of the studied plants decreased significantly the hyperglycemia as compared with control test (water) (p < 0.05). The strongest effect was yielded by Guaiacum coulteri, followed by Marrubium vulgare, Crataegus pubescens, Cynodon dactylon, Calea zacatechichi, Buddleia americana, Bauhinia divaricata and Coix lachryma. The decrease of hyperglycemia caused by Physalis phyladelphyca, Pavonia schiedeana and Eucaliptus globulus was not significant (p > 0.05). Urtica dioica increased glycemia slightly.
Assuntos
Hiperglicemia/tratamento farmacológico , Hipoglicemiantes/uso terapêutico , Plantas Medicinais , Animais , Glicemia/análise , Teste de Tolerância a Glucose , Hiperglicemia/induzido quimicamente , Hipoglicemiantes/isolamento & purificação , Masculino , México , Extratos Vegetais/isolamento & purificação , Extratos Vegetais/uso terapêutico , Coelhos , Tolbutamida/uso terapêutico , ÁguaRESUMO
To assess the hypoglycemic activity mechanism of some plants used empirically by the Mexican population as antidiabetics, traditional preparations of Cucurbita ficifolia, Guaiacum coulteri, Lepechinia caulescens, and Psacalium peltatum, water, tolbutamide, and Regular Insulin were administered to three groups of rabbits each: 1. Healthy rabbits with temporary hyperglycemia induced by the subcutaneous administration of glucose. 2. Rabbits with moderate diabetes (fasting glycemia 150-300 mg/dl), induced with alloxan. 3. Rabbits with severe diabetes (fasting glycemia higher than 400 mg/dl), induced with alloxan. The plant preparations had a hypoglycemic effect similar to tolbutamide in healthy and mild diabetic rabbits and had no effect in severely diabetic rabbits. These results suggest that some pancreatic function or the presence of insulin is required for the hypoglycemic activity of these plants.
Assuntos
Diabetes Mellitus Experimental/tratamento farmacológico , Hipoglicemiantes/uso terapêutico , Plantas Medicinais , Animais , Avaliação Pré-Clínica de Medicamentos , Hiperglicemia/tratamento farmacológico , Hipoglicemiantes/isolamento & purificação , México , Extratos Vegetais/uso terapêutico , Coelhos , Tolbutamida/uso terapêutico , ÁguaRESUMO
The purpose of this work is to look for the hypoglycemic effect of 12 plants most used in Mexico for controlling diabetes mellitus. The studies were realized in 27 rabbits submitted weekly to glucose tolerance tests after gastric administration of water, tolbutamide or a preparation of the plant. The results showed that tolbutamide and studied plants (except Aloe barbadensis) decreased significantly (p less than 0.05) the area under glucose tolerance curve, in relation with the water control. The strongest effect was yielded by Psacalium peltatum (27.9%), followed by Curcubita ficifolia (26.4%), Lepechinia caulescens (26.0%), Opuntia streptacantha (21.4%), Slanum verbascifolum (21.1%), Teucrium cubense (19.4%), Cecropia obtusifolia (18.9%), Phaseolus vulgaris (18.5%), Tecoma stans (17.5%), Eriobotrya japonica (17.2%), Salpianthus macrodonthus (15.0%), tolbutamide (14.3%), and Aloe barbadensis (1.4%). Our results point out that the majority of the plants most used by the Mexican population to control diabetes mellitus have an evident hypoglycemic action.