Selenomethionine administration decreases the oxidative stress induced by post mortem ischemia in the heart, liver and kidneys of rats.

Selenium is an essential element in human and animal metabolism integrated into the catalytic site of glutathione peroxidase (GPX1), an antioxidant enzyme that protects cells from damage caused by reactive oxygen species (ROS). Oxidative stress refers the imbalance between ROS and antioxidant defense systems. It generates alterations of DNA, proteins and lipid peroxidation. The imbalance occurs particularly during ischemia and lack of postmortem perfusion. This mechanism is of relevance in transplant organs, affecting their survival. The aim of this research is to evaluate the effect of seleno-methionine (SeMet) as a protective agent against postmortem ischemia injury in transplant organs. Wistar rats were orally administered with SeMet. After sacrifice, liver, heart and kidney samples were collected at different postmortem intervals (PMIs). SeMet administration produced a significant increase of Se concentration in the liver (65%, p < 0.001), heart (40%, p < 0.01) and kidneys (45%, p < 0.05). Levels of the oxidative stress marker malondialdehyde (MDA) decreased significantly compared to control in the heart (0.21 ± 0.04 vs. 0.12 ± 0.02 mmol g-1) and kidneys (0.41 ± 0.02 vs. 0.24 ± 0.03 mmol g-1) in a PMI of 1-12 h (p < 0.01). After SeMet administration for 21 days, a significant increase in GPX1 activity was observed in the liver (80%, p < 0.001), kidneys (74%, p < 0.01) and heart (35%, p < 0.05). SeMet administration to rats significantly decreased the oxidative stress in the heart, liver and kidneys of rats generated by postmortem ischemia.

Effect of the leaves aqueous extract of Jodina rhombifolia (Hook. & Arn.) Reissek (Santalaceae) on intestinal function and its acute toxicity.

ETHNOPHARMACOLOGICAL RELEVANCE: In Argentine traditional medicine it is recorded the use of Jodina rhombifolia (Hook. & Arn.) Reissek (Santalaceae) leaves for treating various affections that compromise the intestinal normal functioning. AIM OF THE STUDY: The aim of this study was to assess the effect of J. rhombifolia leaves lyophilized aqueous extract on the intestinal function by means of in vivo and ex vivo experimental assays for determinate the antidiarrheal and antispasmodic capacity. Furthermore, was to evaluate its acute toxicity potential by oral and intraperitoneal administration of extract. MATERIALS AND METHODS: The in vivo assays were conducted by the experimental techniques of intestinal transit in mice, intestinal fluid accumulation in rats and Castor oil-induced diarrhea in mice. In the ex vivo assays, isolated rat duodenum and ileum segments were used for to evaluate the antispasmodic activity through contractile concentration-response curves induced by Carbachol and CaCl2. The acute toxicity of the extract was also investigated by oral and intraperitoneal administration. RESULTS: The extract intraperitoneal administration at the doses 125, 250 and 500 mg/kg, caused a marked reduction in the normal intestinal transit and in the number of diarrheal episodes in a dose-dependent manner. However, the extract did not produce significant changes in the intestinal fluid accumulation with any of the tested dose. The extract demonstrated a non-competitive inhibitory effect on the contractions of intestinal smooth muscle experimentally provoked by the spasmogenic agents Carbachol and CaCl2 in a dose-dependent manner (IC50 = 10.57 ± 1.38 and 6.29 ± 1.54 mg extract/ml Tyrode solution in the isolated organ bath, respectively). ANOVA indicated a significative effect of treatment (p < 0.001). CONCLUSIONS: The scientific evidence achieved based in the used experimental models allows us to indicate that J. rhombifolia leaves lyophilized aqueous extract manifest an antispasmodic activity on intestinal smooth muscle without observation of apparent toxicity symptoms.

Actividad diurética de extractos metanólicos de partes aéreas de Jodina rhombifolia en ratas Wistar / Diuretic activity of methanolic extracts from Jodina rhombifolia aerial parts on Wistar rats

Contexto: Jodina rhombifolia (Hook. & Arn.) Reissek (Santalaceae) es utilizada en la medicina tradicional para una gran diversidad de problemas de salud. Objetivos: Evaluar la actividad diurética de extractos metanólicos de diferentes partes aéreas (hojas, corteza, floema y ramas de aproximadamente tres años) en ratas Wistar. Métodos: La experimentación se organizó con un grupo control negativo (solución salina), un control positivo (furosemida; 10 mg/kg) y para cada extracto vegetal se establecieron tres grupos de animales que recibieron las dosis de 125, 250 y 500 mg/kg. Resultados: La máxima actividad diurética se observó en el grupo de animales experimentado con el extracto metanólico de las hojas, seguido por el ensayado con el extracto de floema. La dosis de 250 mg/kg del extracto metanólico de las hojas fue el más potente, e igualmente importante resultó la dosis de 500 mg/kg, lo cual supone un interesante efecto excretor de agua para un fitodiurético. Estos registros de diuresis no mostraron diferencias estadísticamente significativas con el grupo control positivo. Además, el comienzo de la actividad diurética del extracto metanólico de las hojas fue extremadamente rápido, dentro de la primera hora de administración (para todas las dosis). Conclusiones: Este estudio contribuye a la validación científica del uso etnomedicinal de esta especie botánica en la medicina tradicional de Sudamérica como agente diurético; además, futuros estudios son necesarios para evaluar los mecanismos responsables de la actividad biológica y la seguridad de sus uso repetido.

Context: Jodina rhombifolia (Hook. & Arn.) Reissek (Santalaceae) it´s used in folk medicine for treat a great diversity of health problems. Aims: To evaluate the diuretic activity of aerial parts methanolic extract (leaves, bark, phloem, and branches of approximately three years) in Wistar rats. Methods: The experimentation was organized with a negative control group (saline solution), a positive control (furosemide; 10 mg/kg) and for each methanolic extract were established three groups of animals that received doses of 125, 250 and 500 mg/kg of weight in normal saline solution. Results: The maximum diuretic activity observed in-group administered with leaves methanolic extract followed of phloem extract. The dose 250 mg/kg of leaves methanolic extract was the more potent and equally important, result the dose 500 mg/kg, which supposes an interesting excretor effect of water for a phytodiuretic. These registers of diuresis in Wistar rats did not show significant statistically results with the positive control group. Furthermore, the onset of diuretic activity of leaves methanolic extract was extremely rapid, within the first hour of administration (for all doses). Conclusions: This study contributes to scientific validation of the ethnomedical use of this botanic species in folk medicine of South America as a diuretic agent, although further studies are necessary to evaluate the mechanisms involved in biological activity and safety following repeated use.

Jodina rhombifolia leaves lyophilized aqueous extract decreases ethanol intake and preference in adolescent male Wistar rats.

The leaves of Jodina rhombifolia (Hook. & Arn.) Reissek (Santalaceae) are utilized as anti-alcoholic in Argentine folk medicine. This study was designed to investigate the anti-alcohol properties in adolescent male Wistar rats (postnatal day 29; 83-105 g of weight). We utilized the "self-administration model", which ethanol was offered in the standard home-cage through two-bottle free-choice regimen between an ethanolic solution (20% in tap water, v/v) and tap water with unlimited access for 24h per day for 10 consecutive days. The results obtained show that repeated administration of J. rhombifolia lyophilized extract, markedly reduced ethanol voluntary intake on dose dependent bases. The magnitude in reduction of daily ethanol intake was approximately 29%, 44% and 68%, for the rat groups treated with 62.5, 125 and 250 mg/kg of extract, respectively. Ethanol preference (proportion of ethanol intake versus total fluid intake) was significantly reduced: 21.37% ± 0.79 (0 mg/kg); 15.83% ± 0.93 (62.5 mg/kg); 15.22% ± 1.30 (125 mg/kg) and 9.38% ± 0.57 (250 mg/kg). Daily food intake was significantly higher (p<0.05) in the group treated with 250 mg/kg of JRLE in comparison with vehicle-dose group; the reduction in ethanol intake was associated with a compensatory increase in food intake, probably because in the control group animals a part of the total caloric intake was supplied by ethanol. Treatment was very well tolerated by all animals and without apparent side-effects. These results contribute to the scientific validation of the antialcoholic indication of this botanic species in Argentine folk medicine.

Reduction in voluntary ethanol intake following repeated oral administration of Jodina rhombifolia lyophilized aqueous extract in male Wistar rats.

ETHNOPHARMACOLOGICAL RELEVANCE: The leaves of Jodina rhombifolia (Hook. & Arn.) Reissek (SANTALACEAE) is utilized in Argentine folk medicine for the treatment of alcoholism. AIM OF THE STUDY: To evaluate the antialcoholic activity of Jodina rhombifolia lyophilized aqueous extract (JRLE) in male Wistar rats. MATERIALS AND METHODS: Rats were housed individually in standard plastic cages with wood chip bedding. Throughout the duration of experiment, ethanol was offered in the standard home-cage; two-bottle free-choice regimen between an ethanolic solution (20% in tap water, v/v) and tap water with unlimited access for 24h per day for 10 consecutive days. Rats were administrated intragastrically twice daily (1 ml/200 g) for 10 consecutive days, with the control vehicle (distilled water) or one of the doses of JRLE (125, 250 and 500 mg/Kg weight). Body weight, ethanol, water and food intake were measured every day at the same hour during the 10 days of experimentation. RESULTS: The reducing effect of JRLE on daily ethanol intake was evidenced from the first day of treatment and persisted throughout the entire treatment period. The treatment did not significantly affect daily water intake neither the body weight gain. Daily food intake was higher in rat groups treated with JRLE. CONCLUSION: The results obtained in the present preliminary study show that repeated administration of JRLE, markedly reduces ethanol voluntary intake in male Wistar rats. The reduction of consumption was of remarkable magnitude and stable during the treatment 10-days.

Evaluation of macro and microminerals in crude drugs and infusions of five herbs widely used as sedatives

It has been determined the concentration of fourteen micro and macrominerals (Al, Ca, Co, Cr, Cu, Fe, K, Li, Mg, Mn, Na, P, Se, and Zn) in both crude drugs and infusions of Melissa officinalis L., Lamiaceae, Nepeta cataria L., Lamiaceae, Passiflora caerulea L., Passifloraceae, Tilia x moltkei Späth ex C.K. Schneid., Tiliaceae, and Valeriana officinalis L., Caprifoliaceae. These herbs are widely consumed by its sedative properties, either alone or in herb mixtures. All measurements were performed using an inductively coupled plasma optical emission spectrometer (ICP-OES). The products were obtained from regional markets, mainly in San Luis province (Argentina). The estimated daily intake was compared with current recommendations. All products and its infusions were included within the upper tolerable limits for minerals, in trace elements such as toxic elements present at low levels.