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Montevideo, Uruguay

Martinez-Rosales C.,Institute Clemente Estable | Martinez-Rosales C.,University of the Republic of Uruguay | Castro-Sowinski S.,Institute Clemente Estable | Castro-Sowinski S.,University of the Republic of Uruguay
Polar Research | Year: 2011

We report the isolation and identification of bacteria that produce extracellular cold-active proteases, obtained from water samples collected near the Uruguayan Antarctic Base on King George Island, South Shetlands. The bacteria belonged to the genera Pseudomonas (growth between 4 and 30 °C) and Flavobacterium (growth between 4 and 18 °C). In all cases, extracellular protease production was evident when reaching the stationary phase at 18 and 4 °C but was not detected at 30 °C. The zymogram revealed the secretion of one extracellular protease per isolate, each with different relative electrophoretic mobility. The extracellular proteases produced at 4 °C showed thermal activity and stability at 30 °C. Both activity and stability at a temperature higher that 10 °C have no physiological meaning because the isolates do not experience such temperatures in the Antarctic environment; however, the possible ecological value of cold-active and -stable extracellular proteases is discussed. © 2011 C. Martínez-Rosales and S. Castro-Sowinski. Source

Rivera Megret F.,Institute Clemente Estable | Rivera Megret F.,University of the Republic of Uruguay | Tejera Correa D.,Institute Clemente Estable | Tejera Correa D.,University of the Republic of Uruguay | And 5 more authors.
Revista Cubana de Plantas Medicinales | Year: 2013

Introduction: Achyrocline satureioides is a plant which has been widely used in popular medicine and experimental studies confirm its antioxidant and anti-inflammatory effects, attributable to the presence of flavonoids, mainly quercetin. Objectives: to evaluate the neuroprotective effects of a chronic oral preadministration to rats with an Achyrocline satureioides decoction (2 %). Methods: for decoction, dried flowers of Achyrocline satureioides were used. The consumption of food and AS decoction/water of the rats was evaluated daily and weight gain weekly; quercetin content in the decoction and in the plasma of the rats was evaluated by high performance liquid chromatography. The cerebral damage was assessed with a tetrazolium salt (TTC) and a behavioral test was performed previously. Nissl staining and Fluoro-Jade histochemistry were used. Results: the pre-treatment with Achyrocline satureioides in all groups reverted the functional deficit and, during 21 days, the infarction volume also decreased significantly. Nissl staining showed a higher percentage of preserved neuronal population and the Fluoro-Jade showed a decreased of the neurons in degeneration. Conclusions: the quercetin levels in the decoction and plasma of rats could explain the preventive benefits of Achyrocline satureioides due to the antioxidant and antiinflammatory properties described for this flavonoid. Source

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