Age polyethism in Plebeia emerina (Friese) (Hymenoptera: Apidae) colonies related to propolis handling

Stingless bees collect plant resins and make it into propolis, although they have a wider range of use for this material than do honey bees (Apis spp.). Plebeia spp. workers employ propolis mixed with wax (cerumen) for constructing and sealing nest structures, while they use viscous (sticky) propolis for defense by applying it onto their enemies. Isolated viscous propolis deposits are permanently maintained at the interior of their colonies, as also seen in other Meliponini species. Newly-emerged Plebeia emerina (Friese) workers were observed stuck to and unable to escape these viscous propolis stores. We examined the division of labor involved in propolis manipulation, by observing marked bees of known age in four colonies of P. emerina from southern Brazil. Activities on brood combs, the nest involucrum and food pots were observed from the first day of life of the marked bees. However, work on viscous propolis deposits did not begin until the 13th day of age and continued until the 56th day (maximum lifespan in our sample). Although worker bees begin to manipulate cerumen early, they seem to be unable to handle viscous propolis till they become older

Targeting lactate transport suppresses in vivo breast tumour growth.

BACKGROUND Most cancers, including breast cancer, have high rates of glucose consumption, associated with lactate production, a process referred as "Warburg effect". Acidification of the tumour microenvironment by lactate extrusion, performed by lactate transporters (MCTs), is associated with higher cell proliferation, migration, invasion, angiogenesis and increased cell survival. Previously, we have described MCT1 up-regulation in breast carcinoma samples and demonstrated the importance of in vitro MCT inhibition. In this study, we performed siRNA knockdown of MCT1 and MCT4 in basal-like breast cancer cells in both normoxia and hypoxia conditions to validate the potential of lactate transport inhibition in breast cancer treatment. RESULTS The effect of MCT knockdown was evaluated on lactate efflux, proliferation, cell biomass, migration and invasion and induction of tumour xenografts in nude mice. MCT knockdown led to a decrease in in vitro tumour cell aggressiveness, with decreased lactate transport, cell proliferation, migration and invasion and, importantly, to an inhibition of in vivo tumour formation and growth. CONCLUSIONS This work supports MCTs as promising targets in cancer therapy, demonstrates the contribution of MCTs to cancer cell aggressiveness and, more importantly, shows, for the first time, the disruption of in vivo breast tumour growth by targeting lactate transport.This work was supported by Fundação para a Ciência e a Tecnologia (FCT) (grant number PTDC/ SAU-FCF/104347/2008), under the scope of “Programa Operacional Temático Factores de Competitividade” (COMPETE) of “Quadro Comunitário de Apoio III” and co-financed by the Fundo Europeu De Desenvolvimento Regional (FEDER). FM-S, VM-G and AHJM received doctoral fellowships from FCT (refs. SFRH/BD/87139/2012, SFRH/BD/ 51997/2012 and SFRH/ BD/68270/2010, respectively). SG received a postdoctoral fellowship from UMINHO/BPD/18/2014 and CP from FCT (ref. SFRH/BPD/69479/2010)

In vitro protective effect and antioxidant mechanism of Resveratrol induced by Dapsone Hydroxylamine in human cells

Dapsone (DDS) hydroxylamine metabolites cause oxidative stress- linked adverse effects in patients, such as methemoglobin formation and DNA damage. This study evaluated the ameliorating effect of the antioxidant resveratrol (RSV) on DDS hydroxylamine (DDSNHOH) mediated toxicity in vitro using human erythrocytes and lymphocytes. The antioxidant mechanism was also studied using in-silico methods. In addition, RSV provided intracellular protection by inhibiting DNA damage in human lymphocytes induced by DDS-NHOH. However, whilst pretreatment with RSV (10-1000 μM significantly attenuated DDS-NHOH-induced methemoglobinemia, but it was not only significantly less effective than methylene blue (MET), but also post-treatment with RSV did not reverse methemoglobin formation, contrarily to that observed with MET. DDS-NHOH inhibited catalase (CAT) activity and reactive oxygen species (ROS) generation, but did not alter superoxide dismutase (SOD) activity in erythrocytes. Pretreatment with RSV did not alter these antioxidant enzymes activities in erythrocytes treated with DDS-NHOH. Theoretical calculations using density functional theory methods showed that DDS-NHOH has a pro-oxidant effect, whereas RSV and MET have antioxidant effect on ROS. The effect on methemoglobinemia reversion for MET was significantly higher than that of RSV. These data suggest that the pretreatment with resveratrol may decrease heme-iron oxidation and DNA damage through reduction of ROS generated in cells during DDS therapy

Performance of cryptococcal antigen lateral flow assay in serum, cerebrospinal fluid, whole blood, and urine in HIV-infected patients with culture-proven cryptococcal meningitis admitted at a Brazilian referral center

Cryptococcal meningitis is the most common cause of opportunistic meningitis in HIV-infected patients in Brazil and causes unacceptable high mortality rates. In this study, HIV-infected patients with a first episode of culture-proven cryptococcal meningitis in cerebrospinal fluid (CSF) were prospectively included in order to evaluate sensitivity of cryptococcal antigen (CrAg) lateral flow assay (LFA) in serum, CSF, whole blood (fingerstick), and fresh urine. In addition, HIV-infected patients with other neurological confirmed diseases were included in order to evaluate the specificity of CrAg LFA in serum. Twenty patients with cryptococcal meningitis were included and in 19 of them, CrAg LFA in CSF, serum, and whole blood were positive (95% sensitivity). In 18 patients, India ink test was positive in CSF (90% sensitivity), and in 16 cases, CrAg LFA was positive in urine (80% sensitivity). Thirty-six HIV-infected patients with other neurological diseases had negative results of CrAg LFA in serum (100% specificity). In conclusion, CrAg LFA in serum, CSF, and whole blood showed high sensitivity and specificity. Whole blood CrAg LFA seems to be a good and reliable strategy to improve AIDS-related cryptococcal meningitis diagnosis in Brazil

Preferencias matrimoniales en el área de los Cerrillos Canelones–Uruguay

El objetivo de la investigación es estudiar las preferencias matrimoniales de la segunda y tercera generación de descendientes de inmigrantes canarios en el área de influencia de Los Cerrillos, Departamento de Canelones, Uruguay. A partir de 105 entrevistas realizadas a los descendientes canarios establecidos en la zona, se realizó la reconstrucción genealógica a través del programa GenoPro (2095 individuos en total, 67 ancestros fundadores), con el fin de estimar las preferencias matrimoniales de los mismos. Los resultados obtenidos muestran una tendencia a uniones dentro del grupo de pertenencia, encontrándose valores altos de endogamia y consanguinidad; los cuales se mantienen a través de varias generaciones. Se discute si las causas que contribuyen a mantener esta conducta en la elección del cónyuge, son de carácter cultural (la búsqueda de reafirmar la identidad como elemento unificador), geográfico (la existencia de barreras naturales que aislan a las familias) o económicas (mantener dentro de la familia los bienes y la tierra adquiridas).Sesión de posters.Asociación de Antropología Biológica de la República Argentina (AABRA

Preferencias matrimoniales en el área de los Cerrillos Canelones–Uruguay

El objetivo de la investigación es estudiar las preferencias matrimoniales de la segunda y tercera generación de descendientes de inmigrantes canarios en el área de influencia de Los Cerrillos, Departamento de Canelones, Uruguay. A partir de 105 entrevistas realizadas a los descendientes canarios establecidos en la zona, se realizó la reconstrucción genealógica a través del programa GenoPro (2095 individuos en total, 67 ancestros fundadores), con el fin de estimar las preferencias matrimoniales de los mismos. Los resultados obtenidos muestran una tendencia a uniones dentro del grupo de pertenencia, encontrándose valores altos de endogamia y consanguinidad; los cuales se mantienen a través de varias generaciones. Se discute si las causas que contribuyen a mantener esta conducta en la elección del cónyuge, son de carácter cultural (la búsqueda de reafirmar la identidad como elemento unificador), geográfico (la existencia de barreras naturales que aislan a las familias) o económicas (mantener dentro de la familia los bienes y la tierra adquiridas).Sesión de posters.Asociación de Antropología Biológica de la República Argentina (AABRA