排序方式: 共有203条查询结果,搜索用时 78 毫秒
1.
Panagiota Christia Marcin Bujak Carlos Gonzalez-Quesada Wei Chen Marcin Dobaczewski Anilkumar Reddy Nikolaos G. Frangogiannis 《The journal of histochemistry and cytochemistry》2013,61(8):555-570
Mouse models of myocardial infarction are essential tools for the study of cardiac injury, repair, and remodeling. Our current investigation establishes a systematic approach for quantitative evaluation of the inflammatory and reparative response, cardiac function, and geometry in a mouse model of reperfused myocardial infarction. Reperfused mouse infarcts exhibited marked induction of inflammatory cytokines that peaked after 6 hr of reperfusion. In the infarcted heart, scar contraction and chamber dilation continued for at least 28 days after reperfusion; infarct maturation was associated with marked thinning of the scar, accompanied by volume loss and rapid clearance of cellular elements. Echocardiographic measurements of end-diastolic dimensions correlated well with morphometric assessment of dilative remodeling in perfusion-fixed hearts. Hemodynamic monitoring was used to quantitatively assess systolic and diastolic function; the severity of diastolic dysfunction following myocardial infarction correlated with cardiomyocyte hypertrophy and infarct collagen content. Expression of molecular mediators of inflammation and cellular infiltration needs to be investigated during the first 72 hr, whereas assessment of dilative remodeling requires measurement of geometric parameters for at least four weeks after the acute event. Rapid initiation and resolution of the inflammatory response, accelerated scar maturation, and extensive infarct volume loss are important characteristics of infarct healing in mice. 相似文献
2.
Ielham Hadad Alex Veithen Jean–Yves Springael Panagiota A. Sotiropoulou Agnès Mendes Da Costa Fran?oise Miot Robert Naeije Xavier De Deken Kathleen Mc Entee 《PloS one》2013,8(2)
Stroma cell-derived factor-1α (SDF-1α) is a cardioprotective chemokine, acting through its G-protein coupled receptor CXCR4. In experimental acute myocardial infarction, administration of SDF-1α induces an early improvement of systolic function which is difficult to explain solely by an anti-apoptotic and angiogenic effect. We wondered whether SDF-1α signaling might have direct effects on calcium transients and beating frequency.Primary rat neonatal cardiomyocytes were culture-expanded and characterized by immunofluorescence staining. Calcium sparks were studied by fluorescence microscopy after calcium loading with the Fluo-4 acetoxymethyl ester sensor. The cardiomyocyte enriched cellular suspension expressed troponin I and CXCR4 but was vimentin negative. Addition of SDF-1α in the medium increased cytoplasmic calcium release. The calcium response was completely abolished by using a neutralizing anti-CXCR4 antibody and partially suppressed and delayed by preincubation with an inositol triphosphate receptor (IP3R) blocker, but not with a ryanodine receptor (RyR) antagonist. Calcium fluxes induced by caffeine, a RyR agonist, were decreased by an IP3R blocker. Treatment with forskolin or SDF-1α increased cardiomyocyte beating frequency and their effects were additive. In vivo, treatment with SDF-1α increased left ventricular dP/dtmax.These results suggest that in rat neonatal cardiomyocytes, the SDF-1α/CXCR4 signaling increases calcium transients in an IP3-gated fashion leading to a positive chronotropic and inotropic effect. 相似文献
3.
Eftihia Sbarouni Panagiota Georgiadou Ioannis Sklavainas Antigoni Chaidaroglou Demosthenes Panagiotakos Demitrios Degiannis 《Biomarkers》2013,18(5):317-320
Background: Heart-type fatty acid-binding protein (H-FABP) is considered a marker of myocardial necrosis but whether or not it is modified by myocardial ischemia is not clear. We sought to investigate if H-FABP serum levels increase following non-urgent coronary angioplasty.Methods: We studied 31 patients undergoing coronary angioplasty. Peripheral venous samples were drawn immediately before angioplasty, 1?h after the first balloon inflation and 24?h after the procedure and assayed for H-FABP.Results: Serum levels of H-FABP increased significantly at 1?h vs baseline from 2554?±?1268 to 3322?±?245?pg?ml?1 (p?=?0.024). However, no differences were observed between 1?h and 24?h after angioplasty (3268?±?1861 vs 3322?±?2459?pg ml?1, p?=?0.87). Moreover, no significant difference was observed when we compared 24?h after angioplasty with the baseline (3268?±?1861vs 2554?±?1268?pg ml?1, p?=?0.112).Conclusions: We conclude that H-FABP significantly increases after elective coronary angioplasty at 1?h compared with baseline values; whether or not this has any prognostic significance for future events, as it occurs with troponins, needs to be studied further. 相似文献
4.
Asprouli Eleni Kalafati Ioanna Panagiota Sakellari Aikaterini Karavoltsos Sotirios Vlachogiannakos John Revenas Konstantinos Kokkinos Alexander Dassenakis Manos Dedoussis George V. Kalogeropoulos Nick 《Biological trace element research》2019,188(2):326-333
Biological Trace Element Research - Nonalcoholic fatty liver disease (NAFLD) is considered as the hepatic manifestation of metabolic syndrome. Its global prevalence is estimated between 25 and 45%,... 相似文献
5.
Panagiota Koskinioti Erica Ras Antonios A. Augustinos George Tsiamis Leo W. Beukeboom Carlos Caceres Kostas Bourtzis 《Entomologia Experimentalis et Applicata》2019,167(3):197-208
The olive fruit fly, Bactrocera oleae (Rossi) (Diptera: Tephritidae), is the major insect pest of olive orchards (Olea europaea L.), causing extensive damages on cultivated olive crops worldwide. Due to its economic importance, it has been the target species for a variety of population control approaches including the sterile insect technique (SIT). However, the inefficiency of the current mass‐rearing techniques impedes the successful application of area‐wide integrated pest management programs with an SIT component. It has been shown that insect mass rearing and quality of sterile insects can be improved by the manipulation of the insect gut microbiota and probiotic applications. In order to exploit the gut bacteria, it is important to investigate the structure of the gut microbial community. In the current study, we characterized the gut bacterial profile of two wild olive fruit fly populations introduced in laboratory conditions using next generation sequencing of two regions of the 16S rRNA gene. We compared the microbiota profiles regarding the geographic origin of the samples. Additionally, we investigated potential changes in the gut bacteria community before and after the first exposure of the wild adult flies to artificial adult diet with and without antibiotics. Various genera – such as Erwinia, Providencia, Enterobacter, and Klebsiella – were detected for the first time in B. oleae. The most dominant species was Candidatus Erwinia dacicola Capuzzo et al. and it was not affected by the antibiotics in the artificial adult diet used in the first generation of laboratory rearing. Geographic origin affected the overall structure of the gut community of the olive fruit fly, but antibiotic treatment in the first generation did not significantly alter the gut microbiota community. 相似文献
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A time series of survey abundance indices for commercially important demersal fish and cephalopod species, inhabiting the
narrow continental shelf of the southern Aegean Sea, is analyzed in relation to the topography of the area in order to evaluate
the impact of different spatial fishery bans on the bottom-trawl fishery. With reference to the current situation, results
suggested that implementation of the 1967/2006 EC Regulation, which bans bottom-trawl activities within 1.5 NM off the coast,
will significantly increase (20–80%, depending on the species) the proportion of the populations that are inaccessible to
the bottom-trawl fishery. It might also result in shifting of fishing activities toward deeper waters, adding fishing pressure
onto slope resources inhabiting the slope. As depth determines, to a large extent, the distribution pattern of the species,
it constitutes a variable of crucial importance for the spatial management of marine fisheries and should be taken into account
when adopting relevant management regimes. 相似文献
8.
Panagiota Manolakou Roxani Angelopoulou Chris Bakoyiannis Elias Bastounis 《Reproductive biology and endocrinology : RB&E》2009,7(1):44
Cardiovascular disease incidence rates have long been known to significantly differ between the two sexes. Estrogens alone
fail to explain this phenomenon, bringing an increasing amount of attention to the role of androgens. Contrary to what was
initially hypothesized, androgens seem to have an overall cardioprotective effect, especially in men. Recent studies and published
data continue to support this notion displaying a consistent inverse correlation with atherosclerosis progression and cardiovascular
disease both in regressive and prospective study models. Clinical studies have also revealed what seems to be a differential
androgenic effect on various cardiovascular risk factors between men and women. Further insight indicates that in order to
avoid confusion it may be also preferable to separately examine the effects of endogenous androgen levels from exogenous testosterone
administration, as well as discern the differential results of low to normal and supraphysiological administration doses.
This review summarizes old and recent data according to the above distinctions, in an attempt to further our understanding
of the role of androgens in cardiovascular disease. 相似文献
9.
Athanassios Kotsinas Panagiota Papanagnou Panagiotis Galanos Daniel Schramek Paul Townsend Josef M Penninger 《Cell cycle (Georgetown, Tex.)》2014,13(8):1227-1236
Sensing, integrating, and processing of stressogenic signals must be followed by accurate differential response(s) for a cell to survive and avoid malignant transformation. The DNA damage response (DDR) pathway is vital in this process, as it deals with genotoxic/oncogenic insults, having p53 as a nodal effector that performs most of the above tasks. Accumulating data reveal that other pathways are also involved in the same or similar processes, conveying also to p53. Emerging questions are if, how, and when these additional pathways communicate with the DDR axis. Two such stress response pathways, involving the MKK7 stress-activated protein kinase (SAPK) and ARF, have been shown to be interlocked with the ATM/ATR-regulated DDR axis in a highly ordered manner. This creates a new landscape in the DDR orchestrated response to genotoxic/oncogenic insults that is currently discussed. 相似文献
10.
Sonia A. Perez Panagiota A. Sotiropoulou Nectaria N. Sotiriadou Avgi Mamalaki Angelos D. Gritzapis Hartmut Echner Wolfgang Voelter Graham Pawelec Michael Papamichail Constantin N. Baxevanis 《Cancer immunology, immunotherapy : CII》2002,50(11):615-624
HER-2/neu peptides recognized in the context of HLA-DR molecules by CD4(+) Th lymphocytes on antigen-presenting cells have been identified. In this report, we demonstrate for the first time that HER-2/neu helper epitopes are also expressed on the surface of metastatic breast, colorectal and pancreatic carcinomas. Peripheral blood mononuclear cells from an HLA-DR4 healthy donor were used to induce HER-2/neu peptide-specific CD4(+) T cell clones by in vitro immunization with HER-2/neu peptide (884-899)-pulsed autologous dendritic cells (DCs). Strong proliferation and significant levels of IFN-gamma were induced by the CD4(+) T cell clones in response to specific stimulation with autologous DCs loaded with HER-2(884-899). Furthermore, these clones also recognized HER-2/neu(+) tumor cell lines, and tumor cells from breast, colorectal and pancreatic adenocarcinomas induced to express HLA-DR4, but also the HLA-DR4(+) melanoma cell line FM3 transfected to express HER-2/neu. The recognition of tumor cells was strongly inhibited by an anti-HLA-DR mAb. Taken altogether, we provide novel information for the role of HER-2(884-899) as a naturally processed epitope expressed by breast, colorectal and pancreatic carcinomas and the capacity of HER-2/neu protein to follow the endogenous class II processing pathway. Our results suggest that HER-2(884-899) might be attractive for broadly applicable vaccines and may prove useful for adoptive immunotherapy designed for breast, colorectal and pancreatic carcinomas. 相似文献