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111.
Fylaktakidou KC Lehn JM Greferath R Nicolau C 《Bioorganic & medicinal chemistry letters》2005,15(6):1605-1608
Nine inositol tripyrophosphate (ITPP) salts have been synthesized. Their ability to act as allosteric effectors of haemoglobin (Hb) has been measured in vitro with free Hb and whole blood. All the synthesized compounds bound to free Hb and were also able to cross, to a certain extent, the plasma membrane of the red blood cells (RBCs) in whole blood samples, lowering the affinity of Hb for oxygen. The oxy-haemoglobin dissociation curves were significantly shifted towards higher values of oxygen partial pressures, both for free Hb and for intracellular Hb in whole blood. 相似文献
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A HER-2/neu peptide admixed with PLA microspheres induces a Th1-biased immune response in mice 总被引:1,自引:0,他引:1
Nikou KN Stivaktakis N Avgoustakis K Sotiropoulou PA Perez SA Baxevanis CN Papamichail M Leondiadis L 《Biochimica et biophysica acta》2005,1725(2):182-189
The elimination of cancer cells requires strong cellular immune responses, and these responses are induced by the activation of Th1 lymphocytes. In this work, the possibility of inducing a Th1 type of immune response in vivo by mixing a HER-2/neu synthetic CTL (cytotoxic T lymphocyte) peptide [HER-2/neu (789-797)], with poly-lactide (PLA) microspheres was investigated. Various formulations of the peptide were administered to HLA-A2.1 transgenic (HHD) mice. Cellular experiments, assessing proliferation and cytokine determination in splenocyte culture supernatants, were carried out in order to evaluate the type of immune response to the antigen. The in vivo administration of the peptide antigen admixed with the PLA microspheres induced a potent immune response which was comparable to that induced by the combination of the antigen in complete Freund's adjuvant (CFA). Furthermore, the cytokine profile produced by the T lymphocytes of the immunized animals indicated that the combination of the peptide antigen with the PLA microspheres induced a strong Th1 biased immune response to the antigen. The time of peptide incubation with the microspheres prior to administration did not affect the immune response, which further simplifies the preparation of this type of vaccine. The results justify further investigation of the possibility of inducing effective cellular immune responses against cancer cells overexpressing HER-2/neu molecules by simply mixing appropriate HER-2/neu peptide antigens with PLA microspheres. 相似文献
113.
The exchange of ions between plant tissues and the external solution in vitro exhibits prominent biphasic kinetics. This is generally ascribed to the different contribution of the two compartments – apoplast and symplast – involved in the process. In this regard, an electro-diffusion model of the leakage is proposed in the paper. On the basis of the balance of fluxes through the plasmalemma and the cell wall, a system of differential equations describing the ion concentration in the outer solution is found. For a wide range of the system's coefficients, its behaviour is well approximated by a previously obtained analytical function. The values of the function's parameters, derived from the fit with experimental data, correlate adequately with the water deficit conditions of the samples. Hence, these parameters may be used to characterize the physiological status of the investigated plants. 相似文献
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Matzarapi Konstantina Giannakopoulos Aristeidis Chasapi Styliani A. Kritikou Dimitra Efthymiadou Alexandra Chrysis Dionisios Spyroulias Georgios A. 《Metabolomics : Official journal of the Metabolomic Society》2022,18(10):1-12
Metabolomics - The effects of lipopolysaccharides (i.e., endotoxin; LPS) on metabolism are poorly defined in lactating dairy cattle experiencing hyperlipidemia. Our objective was to explore the... 相似文献
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Gerasimos Anagnostopoulos Omar Motio Sijing Li Vincent Carbonnier Hui Chen Valentina Sica Sylvre Durand Mlanie Bourgin Fanny Aprahamian Nitharsshini Nirmalathasan Romain Donne Chantal Desdouets Marcelo Simon Sola Konstantina Kotta La Montgut Flavia Lambertucci Didier Surdez Grossetête Sandrine Olivier Delattre Maria Chiara Maiuri Jos Manuel Bravo-San Pedro Isabelle Martins Guido Kroemer 《Cell death & disease》2022,13(5)
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Konstantina Zografou Andrea Grill Robert J. Wilson John M. Halley George C. Adamidis Vassiliki Kati 《Ecology and evolution》2020,10(2):928-939
Inferring species' responses to climate change in the absence of long‐term time series data is a challenge, but can be achieved by substituting space for time. For example, thermal elevational gradients represent suitable proxies to study phenological responses to warming. We used butterfly data from two Mediterranean mountain areas to test whether mean dates of appearance of communities and individual species show a delay with increasing altitude, and an accompanying shortening in the duration of flight periods. We found a 14‐day delay in the mean date of appearance per kilometer increase in altitude for butterfly communities overall, and an average 23‐day shift for 26 selected species, alongside average summer temperature lapse rates of 3°C per km. At higher elevations, there was a shortening of the flight period for the community of 3 days/km, with an 8.8‐day average decline per km for individual species. Rates of phenological delay differed significantly between the two mountain ranges, although this did not seem to result from the respective temperature lapse rates. These results suggest that climate warming could lead to advanced and lengthened flight periods for Mediterranean mountain butterfly communities. However, although multivoltine species showed the expected response of delayed and shortened flight periods at higher elevations, univoltine species showed more pronounced delays in terms of species appearance. Hence, while projections of overall community responses to climate change may benefit from space‐for‐time substitutions, understanding species‐specific responses to local features of habitat and climate may be needed to accurately predict the effects of climate change on phenology. 相似文献
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Fragaki K Cano A Benoist JF Rigal O Chaussenot A Rouzier C Bannwarth S Caruba C Chabrol B Paquis-Flucklinger V 《Mitochondrion》2011,11(3):533-536
The role of a secondary respiratory chain deficiency as an additional mechanism to intoxication, leading to development of long-term energy-dependent complications, has been recently suggested in patients with propionic acidemia (PA). We show for the first time a coenzyme Q(10) (CoQ(10)) functional defect accompanied by a multiple organ oxidative phosphorylation (OXPHOS) deficiency in a child who succumbed to acute heart failure in the absence of metabolic stress. Quinone-dependent activities in the liver (complex I+III, complex II+III) were reduced, suggesting a decrease in electron transfer related to the quinone pool. The restoration of complex II+III activity after addition of exogenous ubiquinone to the assay system suggests CoQ(10) deficiency. Nevertheless, we disposed of insufficient material to perform direct measurement of CoQ(10) content in the patient's liver. Death occurred before biochemical diagnosis of OXPHOS deficiency could be made. However, this case highlights the usefulness of rapidly identifying CoQ(10) defects secondary to PA since this OXPHOS disorder has a good treatment response which could improve heart complications or prevent their appearance. Nevertheless, further studies will be necessary to determine whether CoQ(10) treatment can be useful in PA complications linked to CoQ(10) deficiency. 相似文献