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  • Coronary angioplasty  (1)
  • ezrin  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Tyrosine Phosphorylation of Moesin in Arachidonic Acid–Stimulated Human Platelets (1998)
    Springer
    Journal of thrombosis and thrombolysis 6 (1998), S. 117-124 
    Details
    ISSN: 1573-742X
    Keywords: moesin ; ezrin ; tyrosine phosphorylation ; arachidonic acid ; platelets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Moesin, a member of the ezrin/radixin/moesin (ERM) family of cytoskeletal proteins, has been implicated in dynamic membrane-based processes such as the formation and stabilization of filopodia. Ezrin is known to be a substrate of tyrosine kinases in activated T cells and epithelial growth factor–stimulated A431 cells. For the closely related 77-kD protein moesin, which shares 72% identity with ezrin on the basis of their amino acid sequences, a reversible phosphorylation on tyrosine residues has not yet been described. Because our scanning electron microscopy studies revealed the appearance of multiple, up to 3 μm long filopodia on the surface of activated human platelets, we investigated the participation of moesin in dynamic shape changes on platelet stimulation with arachidonic acid. Antimoesin immunoprecipitates obtained under denaturing conditions from lysates of resting platelets contained only low amounts of tyrosine-phosphorylated moesin. In lysates of arachidonic acid–stimulated platelets, the level of tyrosine phosphorylation was significantly increased. This activation-dependent phosphorylation of moesin was verified by probing antiphosphotyrosine immunoprecipitates from unstimulated and stimulated platelets with antimoesin antibodies. Tyrosine-phosphorylated moesin was detectable only in the presence of the tyrosine phosphatase inhibitor vanadate, suggesting that a coordinated balance between kinase and phosphatase activities controls the steady-state level of moesin phosphorylation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008845421381
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  • 2
    Electronic Resource
    Electronic Resource
    Morphology of chronic coronary occlusions and response to interventional therapy - a study by intracoronary ultrasound (1997)
    Springer
    The international journal of cardiovascular imaging 13 (1997), S. 475-484 
    Details
    ISSN: 1573-0743
    Keywords: Coronary angioplasty ; chronic coronary occlusion ; intracoronary ultrasound
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Objectives. Balloon angioplasty of chronic coronary occlusions has a low procedural success and a high recurrence rate. Better tomographic insights into the lesion morphology may improve the interventional strategy and results. Methods. Intracoronary ultrasound was used during the recanalizaton procedure of 45 chronic coronary occlusions (2 weeks to 14 months; average 3.4 months) to determine the lesion morphology and to assess the angioplasty result. The luminal area and the plaque burden were measured proximal and distal to the occlusion, and within the occlusion. The ultrasonographic characteristics of the occlusive lesions were compared to 45 nonocclusive lesions of age-matched patients with stable angina pectoris. Results. Occlusive lesions were more often echodense as compared to nonocclusive lesions (35% vs. 20% p=0.10). In chronic occlusions a multi- layered plaque morphology was observed in 22%, and this morphology was not found in nonocclusive lesions. Angiographic characteristics were not related to the ultrasonographic morphology of the lesion. Despite similar vessel areas in occlusive and nonocclusive lesions, the balloon size selected according to the angiographic image was underestimated in occlusive lesions. Based on the quantitative ultrasound measurement the balloon size was increased from 2.6±0.3 mm to 3.3±0.5 mm in 53% of the lesions. This resulted in an increase of the luminal area from 3.51±0.92 to 5.08±1.43 mm2 (p〈0.001). The acute recoil after balloon angioplasty was similar (34±18%) in hypodense and echodense plaques, but was significantly higher in lesions with a multi-layered plaque morphology (49±22%; p〈0.05). In 19 patients with severe dissections or extreme acute recoil (residual stenosis〉50%) the use of a stent increased the luminal area from 3.94±0.81 to 7.51±1.71 mm2 (p〈0.001). Conclusion. Intracoronary ultrasound demonstrated a multi-layered plaque morphology in one fourth of the chronic occlusions. This type of plaque was associated with a significant acute recoil. The presence of diffuse atherosclerosis in neighbouring segments of chronic coronary occlusions leads to underestimation of the balloon size. Quantitative assessment by intracoronary ultrasound helped to optimize the balloon size leading to a significant luminal area gain. The detection of excessive acute recoil should be considered an indication for stent deployment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005847404993
    Location Call Number Limitation Availability
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    Paper (German National Licenses)
    Fulltext
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