排序方式: 共有75条查询结果,搜索用时 31 毫秒
1.
Two-dimensional gel analysis of basic proteins in developing human smooth muscle identifies calponin as a prominent marker of the differentiated phenotype. Adult tissue (human and mouse) typically expresses up to four calponin isoforms, three of which appear sequentially during fetal development: adult myometrial cells express the same three isoforms in primary culture in vitro and these are down-regulated, in reverse order, during the subsequent modulation of phenotype. Monospecific, polyclonal antibodies against calponin identify a lower molecular weight variant of calponin (L-calponin) that is strongly and specifically expressed in adult smooth muscles of the human urogenital tract. L-calponin is down-regulated in benign smooth muscle derived tumors (leiomyoma) and is not expressed in primary cultures of normal uterine tissue. 相似文献
2.
Peng Sun Juan Huo Tibor Kurtán Attila Mándi Sándor Antus Hua Tang Siegfried Draeger Barbara Schulz Hidayat Hussain Karsten Krohn Weihua Pan Yanghua Yi Wen Zhang 《Chirality》2013,25(2):141-148
Four known hydroxyanthraquinones ( 1–4 ) together with four new derivatives having a tetralone moiety, namely coniothyrinones A–D ( 5–8 ), were isolated from the culture of Coniothyrium sp., an endophytic fungus isolated from Salsola oppostifolia from Gomera in the Canary Islands. The structures of the new compounds were elucidated by detailed spectroscopic analysis and comparison with reported data. The absolute configurations of coniothyrinones A ( 5 ), B ( 6 ), and D ( 8 ) were determined by TDDFT calculations of CD spectra, allowing the determination of the absolute configuration of coniothyrinone C ( 7 ) as well. Coniothyrinones A ( 5 ), B ( 6 ), and D ( 8 ) could be used as ECD reference compounds in the determination of absolute configuration for related tetralone derivatives. This is the first report of anthraquinones and derivatives from an isolate of the genus Coniothyrium sp. These compounds showed inhibitory effects against the fungus Microbotryum violaceum, the alga Chlorella fusca, and the bacteria Escherichia coli and Bacillus megaterium. Chirality 25:141–148, 2013. © 2012 Wiley Periodicals, Inc. 相似文献
3.
Hilda T. Draeger Shervin Assassi Roozbeh Sharif Emilio B. Gonzalez Brock E. Harper Frank C. Arnett Ameena Manzoor Richard A. Lange Maureen D. Mayes 《PloS one》2013,8(10)
Objective
To evaluate the prognostic significance of baseline electrocardiogram (ECG) abnormalities in a multiethnic cohort of patients with early systemic sclerosis (SSc) and to determine the serological, clinical, and echocardiogram correlates of ECG findings.Methods
SSc patients with disease duration of≤5 years were enrolled in the GENISOS (Genetics versus Environment in Scleroderma Outcome Study) cohort. At the first visit, a standard 12 lead ECG was obtained along with demographic information, clinical data, and autoantibodies. The results of echocardiograms were also recorded. All ECGs were interpreted by a cardiologist unaware of the patients'' clinical data.Results
Of 265 SSc patients with average disease duration at enrollment of 2.5 years, 140 (52.8%) had abnormal ECG findings. These findings were not associated with SSc disease type or autoantibody profile but were associated with more severe heart and lung involvement. A total of 75 patients (28.3%) died over a follow up time of 9.9 years. Complete right bundle branch block (± left anterior hemiblock) on ECG, present in 7 (2.6%) patients, predicted a higher risk of mortality (HR: 5.3; 95% CI: 2.1 to 13.4; p<0.001). The predictive significance of right bundle branch block was independent of age at enrollment, gender, ethnicity and risk factors for coronary artery disease.Conclusion
ECG abnormalities are common in patients with early SSc and are associated with the severity of lung and heart involvement. Right bundle branch block is an independent predictor of mortality, and should be considered a marker of disease severity in SSc. 相似文献4.
The mechanical link coupling cytoskeletal and contractile proteins to the sarcolemma of smooth muscle cells is essential for transmitting tension from the cell's interior to exterior. In addition to the well-characterized actin-integrin associations present in adhaerens junctions, our recent work has postulated the existence of a reversible annexin-dependent membrane-cytoskeleton complex, forged in response to a rise in intracellular Ca2+ concentration following smooth muscle cell stimulation (Babiychuk et al., J. Biol Chem. 1999, 274, 35191-35195). Detailed biochemical characterization of the interactions responsible for the formation of this complex revealed that annexins II and VI interact with actomyosin, or detergent-insoluble glycosphingolipid-enriched membrane domains (rafts) purified from smooth muscle, in a concentration- and Ca2+-dependent manner. Annexin II interacted with lipid rafts with high Ca2+-sensitivity, while for annexin VI this interaction required non-physiologically high concentrations of free Ca2+. However, the Ca2+-sensitivity of the latter interaction strongly increased in the presence of purified smooth muscle actomyosin. The detailed biochemical analysis of the interactions occurring between annexin II, annexin VI, actomyosin and rafts suggests that annexins regulate sarcolemmal organization during smooth muscle cell contraction. 相似文献
5.
6.
Babiychuk EB Atanassoff AP Monastyrskaya K Brandenberger C Studer D Allemann C Draeger A 《PloS one》2011,6(8):e23706
Ceramide is a key lipid mediator of cellular processes such as differentiation, proliferation, growth arrest and apoptosis. During apoptosis, ceramide is produced within the plasma membrane. Although recent data suggest that the generation of intracellular ceramide increases mitochondrial permeability, the source of mitochondrial ceramide remains unknown. Here, we determine whether a stress-mediated plasmalemmal pool of ceramide might become available to the mitochondria of apoptotic cells. We have previously established annexin A1--a member of a family of Ca(2+) and membrane-binding proteins--to be a marker of ceramide platforms. Using fluorescently tagged annexin A1, we show that, upon its generation within the plasma membrane, ceramide self-associates into platforms that subsequently invaginate and fuse with mitochondria. An accumulation of ceramide within the mitochondria of apoptotic cells was also confirmed using a ceramide-specific antibody. Electron microscopic tomography confirmed that upon the formation of ceramide platforms, the invaginated regions of the plasma membrane extend deep into the cytoplasm forming direct physical contacts with mitochondrial outer membranes. Ceramide might thus be directly transferred from the plasma membrane to the mitochondrial outer membrane. It is conceivable that this "kiss-of-death" increases the permeability of the mitochondrial outer membrane thereby triggering apoptosis. 相似文献
7.
Schreiber S Bueche CZ Garz C Kropf S Kuester D Amann K Heinze HJ Goertler M Reymann KG Braun H 《PloS one》2011,6(10):e26287
Introduction
Human cerebral small vessel disease (CSVD) has been hypothesized to be an age-dependent disease accompanied by similar vascular changes in other organs. SHRSP feature numerous vascular risk factors and may be a valid model of some aspects of human CSVD. Here we compare renal histopathological changes with the brain pathology of spontaneously hypertensive stroke-prone rats (SHRSP).Material and Methods
We histologically investigated the brains and kidneys of 61 SHRSP at different stages of age (12 to 44 weeks). The brain pathology (aggregated erythrocytes in capillaries and arterioles, microbleeds, microthromboses) and the kidney pathology (aggregated erythrocytes within peritubular capillaries, tubular protein cylinders, glomerulosclerosis) were quantified separately. The prediction of the brain pathology by the kidney pathology was assessed by creating ROC-curves integrating the degree of kidney pathology and age of SHRSP.Results
Both, brain and kidney pathology, show an age-dependency and proceed in definite stages whereas an aggregation of erythrocytes in capillaries and arterioles, we parsimoniously interpreted as stases, represent the initial finding in both organs. Thus, early renal tubulointerstitial damage characterized by rather few intravasal erythrocyte aggregations and tubular protein cylinders predicts the initial step of SHRSPs'' cerebral vascular pathology marked by accumulated erythrocytes. The combined increase of intravasal erythrocyte aggregations and protein cylinders accompanied by glomerulosclerosis and thrombotic renal microangiopathy in kidneys of older SHRSP predicts the final stages of SHRSPs'' cerebrovascular lesions marked by microbleeds and thrombotic infarcts.Conclusion
Our results illustrate a close association between structural brain and kidney pathology and support the concept of small vessel disease to be an age-dependent systemic pathology. Further, an improved joined nephrologic and neurologic diagnostic may help to identify patients with CSVD at an early stage. 相似文献8.
Monastyrskaya K Hostettler A Buergi S Draeger A 《The Journal of biological chemistry》2005,280(8):7135-7146
The spatial targeting of receptors to discrete domains within the plasma membrane allows their preferential coupling to specific effectors, which is essential for rapid and accurate discrimination of signals. Efficiency of signaling is further increased by protein and lipid segregation within the plasma membrane. We have previously demonstrated the importance of raft-mediated signaling in the regulation of smooth and skeletal muscle cell contraction. Since G protein-coupled receptors (GPCRs) are key components in the regulation of smooth muscle contraction-relaxation cycles, it is important to determine whether GPCR signaling is mediated by lipid rafts and raft-associated molecules. Neurokinin 1 receptor (NK1R) is expressed in central and peripheral nervous system as well as in endothelial and smooth muscle cells and involved in mediation of pain, inflammation, exocrine secretion, and smooth muscle contraction. The NK1 receptor was transiently expressed in HEK293 and HepG2 cell lines and its localization in membrane microdomains investigated using biochemical methods and immunofluorescent labeling. We show that the NK1 receptor, similar to the earlier described beta(2)-adrenergic receptor and G proteins, localizes to lipid rafts and caveolae. Protein kinase C (PKC) is one of the downstream effectors of the NK1 activation. Its active form translocates from the cytoplasm to the plasma membrane. Upon stimulation of the NK1 receptor with Substance P, the activated PKC relocated to lipid rafts. Using cholesterol extraction and replenishment assays we show that activation of NK1 receptor is dependent on the microarchitecture of the plasma membrane: NK1R-mediated signaling was abolished after cholesterol depletion of the receptor-expressing cells with methyl-beta-cyclodextrin. Our results demonstrate that reorganization of the plasma membrane has an effect on the activation of the raft-associated NK1R and the down-stream events such as recruitment of protein kinases. 相似文献
9.
Wex T Treiber G Venerito M Leodolter A Peitz U Kuester D Hritz I Krueger S Roessner A Malfertheiner P 《Biological chemistry》2006,387(7):893-901
The secretory leukocyte protease inhibitor (SLPI) exerts antiproteolytic activity towards serine proteases, as well as anti-microbial and anti-inflammatory effects. To investigate its role in H. pylori-mediated diseases, SLPI expression was analyzed by RT-PCR, ELISA and immunohistochemistry in clinical samples and gastric tumor cell lines. Determination of the mucosal SLPI levels in 126 patients confirmed the previously reported downregulation of SLPI in H. pylori-infected patients. The lower SLPI levels in antral biopsies of H. pylori-positive subjects were associated with a 30-fold increase (p<0.01) in neutrophil elastase activity, and a significant negative correlation was demonstrated for both parameters (R=-0.63, p=0.0002). Eradication of the bacterium in a long-term study (5-7 years) led to a recovery of mucosal SLPI expression. In vitro experiments using four gastric tumor cell lines (AGS, MKN-28, MKN-45, NCI-N87) generally confirmed the clinical findings. While the co-incubation of these cell lines with H. pylori resulted in lower or unchanged SLPI protein levels, the corresponding SLPI mRNA amounts were upregulated by up to five-fold (p=0.006) in all cell lines. Taken together, these results indicate that the reduction in antral SLPI levels in H. pylori-infected subjects has a functional relevance for gastric mucosa and the H. pylori-induced decrease in SLPI is primarily regulated at the posttranslational level. 相似文献
10.