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71.
Julio C. Rojas Yolanda Brindis Edi A. Malo Leopoldo Cruz-López 《Physiological Entomology》2004,29(4):356-362
Abstract. The influence of weight and colony origin of the queen of Solenopsis geminata (F.) (Hymenoptera: Formicidae) on worker attraction is studied under laboratory conditions. In the first experiment, worker response to individual queens of different weight from the same colony is evaluated. Heavier queens are more attractive than smaller queens to their own workers. In subsequent experiments, the colony origin effect is investigated and worker response to a pair of queens of the same weight from the same or different colonies is compared. When queens are from the same colony, workers do not show a significant preference between queens. However, when queens are from a different colony, workers are significantly more attracted to their own queen than to the foreign queen. Finally, the response of workers to queens of different weight from the same or different colonies is investigated. In both cases, workers are significantly more attracted to a heavier queen than a lighter queen, even if the lighter queen is their own queen. A putative pheromonal component (E)‐6‐(1‐pentenyl)‐2H‐2‐pyranone, is not positively correlated with queen weight. 相似文献
72.
Marcella Zollino Rosetta Lecce Marina Murdolo Daniela Orteschi Giuseppe Marangi Angelo Selicorni Alina Midro Giovanni Sorge Giuseppe Zampino Luigi Memo Domenica Battaglia Michael Petersen Effie Pandelia Yolanda Gyftodimou Francesca Faravelli Romano Tenconi Livia Garavelli Laura Mazzanti Rita Fischetto Pietro Cavalli Salvatore Savasta Laura Rodriguez Giovanni Neri 《Human genetics》2008,123(3):319-319
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76.
María álvarez-Viejo Yolanda Menéndez-Menéndez Jesús Otero-Hernández 《World journal of stem cells》2015,7(2):470-476
Mesenchymal stem cells, due to their characteristics are ideal candidates for cellular therapy. Currently, in culture these cells are defined by their adherence to plastic, specific surface antigen expression and multipotent differentiation potential. However, the in vivo identification of mesenchymal stem cells, before culture, is not so well established. Pre-culture identification markers would ensure higher purity than that obtained with selection based on adherence to plastic. Up until now, CD271 has been described as the most specific marker for the characterization andpurification of human bone marrow mesenchymal stem cells. This marker has been shown to be specifically expressed by these cells. Thus, CD271 has been proposed as a versatile marker to selectively isolated and expand multipotent mesenchymal stem cells with both immunosuppressive and lymphohematopoietic engraftment-promoting properties. This review focuses on this marker, specifically on identification of mesenchymal stem cells from different tissues. Literature revision suggests that CD271 should not be defined as a universal marker to identify mesenchymal stem cells before culture from different sources. In the case of bone marrow or adipose tissue, CD271 could be considered a quite suitable marker; however this marker seems to be inadequate for the isolation of mesenchymal stem cells from other tissues such as umbilical cord blood or wharton’s jelly among others. 相似文献
77.
Yolanda Stypula-Cyrus Nikhil N. Mutyal Mart Dela Cruz Dhananjay P. Kunte Andrew J. Radosevich Ramesh Wali Hemant K. Roy Vadim Backman 《FEBS letters》2014
End-binding protein (EB1) is a microtubule protein that binds to the tumor suppressor adenomatous polyposis coli (APC). While EB1 is implicated as a potential oncogene, its role in cancer progression is unknown. Therefore, we analyzed EB1/APC expression at the earliest stages of colorectal carcinogenesis and in the uninvolved mucosa (“field effect”) of human and animal tissue. We also performed siRNA-knockdown in colon cancer cell lines. EB1 is up-regulated in early and field carcinogenesis in the colon, and the cellular/nano-architectural effect of EB1 knockdown depended on the genetic context. Thus, dysregulation of EB1 is an important early event in colon carcinogenesis. 相似文献
78.
Marianne Suter Paolo Salvioni Ramon F Thali Roland Scholz Kari Vaahtomeri Yolanda Auchli Helene Rechsteiner René A Brunisholz Benoit Viollet Tomi P Mäkelä Theo Wallimann Dietbert Neumann Wilhelm Krek 《The EMBO journal》2010,29(2):469-481
The mobilization of metabolic energy from adipocytes depends on a tightly regulated balance between hydrolysis and resynthesis of triacylglycerides (TAGs). Hydrolysis is stimulated by β‐adrenergic signalling to PKA that mediates phosphorylation of lipolytic enzymes, including hormone‐sensitive lipase (HSL). TAG resynthesis is associated with high‐energy consumption, which when inordinate, leads to increased AMPK activity that acts to restrain hydrolysis of TAGs by inhibiting PKA‐mediated activation of HSL. Here, we report that in primary mouse adipocytes, PKA associates with and phosphorylates AMPKα1 at Ser‐173 to impede threonine (Thr‐172) phosphorylation and thus activation of AMPKα1 by LKB1 in response to lipolytic signals. Activation of AMPKα1 by LKB1 is also blocked by PKA‐mediated phosphorylation of AMPKα1 in vitro. Functional analysis of an AMPKα1 species carrying a non‐phosphorylatable mutation at Ser‐173 revealed a critical function of this phosphorylation for efficient release of free fatty acids and glycerol in response to PKA‐activating signals. These results suggest a new mechanism of negative regulation of AMPK activity by PKA that is important for converting a lipolytic signal into an effective lipolytic response. 相似文献
79.
Carmen Aspíroz Yolanda Gilaberte Antonio Rezusta Teun Boekhout Ma Carmen Rubio 《Revista iberoamericana de micología》2010,27(1):20-21
BackgroundMalassezia pachydermatis is a yeast of importance in both veterinary and human medicine.AimsTo know if M. pachydermatis grow on micological media with high concentrations of gentamycin.MethodsTwenty M. pachydermatis strains were streaked on Sabouraud Dextrose Agar plates with different concentrations of gentamycin.ResultsAll isolates were inhibited when high concentrations of gentamycin were added.ConclusionsThe use of plates with high concentrations of gentamycin can lead to some important misdiagnoses: firstly, false-negative cultures, and secondly, an erroneous classification of M. pachydermatis as a lipid-dependent species. Morever, all of this could be useful in two therapeutic fields: i) in animals, topical gentamycin could be an efficacious treatment for a disease such as external otitis in dogs; ii) in humans, we hypothesize that gentamycin could be regarded as a possible therapy (“antibiotic-lock”) for catheter-associated Malassezia spp. infections. 相似文献
80.
José Moisés Laparra Llopis Yolanda Sanz Herranz 《Journal of physiology and biochemistry》2010,66(2):153-159
Celiac disease is an autoimmune enteropathy caused by a permanent intolerance to gliadins. In this study the effects of two
gliadin-derived peptides (PA2, PQPQLPYPQPQLP and PA9, QLQPFPQPQLPY) on TNFα production by intestinal epithelial cells (Caco-2)
and whether these effects were related to protein kinase A (PKA) and/or -C (PKC) activities have been evaluated. Caco-2 cell
cultures were challenged with several sets of gliadin peptides solutions (0.25 mg/mL), with/without different activators of
PKA or PKC, bradykinin (Brdkn) and pyrrolidine dithiocarbamate (PDTC). The gliadin-derived peptides assayed represent the
two major immunodominant epitopes of the peptide 33-mer of α-gliadin (56–88) (LQLQPFPQPQLPYPQPQLPYPQPQLPYPQPQPF). Both peptides induced the TNFα production triggering the inflammatory cell responses, the PA2 being more effective.
The addition of the peptides in the presence of dibutyril cyclic AMP (cAMP), Brdkn or PDTC, inhibited the TNFα production.
The PKC-activator phorbol 12-myristate 13-diacetate additionally increased the PA2- and PA9-induced TNFα production. These
results link the gliadin-derived peptides induced TNFα production through cAMP-dependent PKA activation, where ion channels
controlling calcium influx into cells could play a protective role, and requires NF-κB activation. 相似文献