18 research outputs found
香港の衛星都市
textabstractThe Drosophila protein Sex-lethal (Sxl) contains two RNP consensus-type RNA-binding domains (RBDs) separated by a short linker sequence. Both domains are essential for high-affinity binding tO the single-stranded polypyrimidine tract (PPT) within the regulated 3' splice site of the transformer (tra) pre- mRNA. In this paper, the effect of RNA binding to a protein fragment containing both RBDs from Sxl (Sxl-RBD1+2) has been characterized by heteronuclear NMR. Newly complete (85-90%) backbone resonance assignments have been obtained for unbound and RNA-bound states of Sxl-RBD1+2. A comparison of amide 1H and 15N chemical shifts between free and bound states has highlighted residues which respond to RNA binding. The β-sheets in both RBDs (RBD1 and RBD2) form an RNA interaction surface, as has been observed in other RBDs. A significant number of residues display different behavior when comparing RBD1 and RBD2. This argues for a model in which RBD1 and RBD2 of Sxl have different or nonanalogous points of interaction with the tra PPT. R142 (in RBD2) exhibits the largest chemical shift change upon RNA binding. The role of R142 in RNA binding was tested by measuring the K(d) of a mutant of Sxl-RBD1+2 in which R142 was replaced by alanine. This mutant lost the ability to bind RNA, showing a correlation with the chemical shift difference data. The RNA-binding affinities of two other mutants, F146A and T138I, were also shown to correlate with the NMR observations
Risk Factors for In-hospital Nonhemorrhagic Stroke in Patients With Acute Myocardial Infarction Treated With Thrombolysis: Results from GUSTO-I
BACKGROUND: Nonhemorrhagic stroke occurs in 0.1% to 1.3% of patients with
acute myocardial infarction who are treated with thrombolysis, with
substantial associated mortality and morbidity. Little is known about the
risk factors for its occurrence. METHODS AND RESULTS: We studied the 247
patients with nonhemorrhagic stroke who were randomly assigned to one of
four thrombolytic regimens within 6 hours of symptom onset in the GUSTO-I
trial. We assessed the univariable and multivariable baseline risk factors
for nonhemorrhagic stroke and created a scoring nomogram from the baseline
multivariable modeling. We used time-dependent Cox modeling to determine
multivariable in-hospital predictors of nonhemorrhagic stroke. Baseline
and in-hospital predictors were then combined to determine the overall
predictors of nonhemorrhagic stroke. Of the 247 patients, 42 (17%) died
and another 98 (40%) were disabled by 30-day follow-up. Older age was the
most important baseline clinical predictor of nonhemorrhagic stroke,
followed by higher heart rate, history of stroke or transient ischemic
attack, diabetes, previous angina, and history of hypertension. These
factors remained statistically significant predictors in the combined
model, along with worse Killip class, coronary angiography, bypass
surgery, and atrial fibrillation/flutter. CONCLUSIONS: Nonhemorrhagic
stroke is a serious event in patients with acute myocardial infarction who
are treated with thrombolytic, antithrombin, and antiplatelet therapy. We
developed a simple nomogram that can predict the risk of nonhemorrhagic
stroke on the basis of baseline clinical characteristics. Prophylactic
anticoagulation may be an important treatment strategy for patients with
high probability for nonhemorrhagic stroke, but further study is needed
Cost effectiveness of thrombolytic therapy with tissue plasminogen activator as compared with streptokinase for acute myocardial infarction
BACKGROUND. Patients with acute myocardial infarction who were treated with accelerated tissue plasminogen activator (t-PA) (given over a period of 1 1/2 hours rather than the conventional 3 hours, and with two thirds of the dose given in the first 30 minutes) had a 30-day mortality that was 15 percent lower than that of pati
Selection of thrombolytic therapy for individual patients: development of a clinical model
We developed a logistic regression model with data from the GUSTO-I trial to predict mortality rate differences in individual patients who received accelerated tissue plasminogen activator (TPA) versus streptokinase treatment for acute myocardial infarction. A nomogram was developed from a reduced version of this model that approximated the underlying risk of patients treated with streptokinase, and thus the benefit of TPA. The 30-day mortality rate with accelerated TPA was 0.063 versus 0.073 with streptokinase and subcutaneously administered heparin and 0.074 with streptokinase and intravenously administered heparin. No baseline patient characteristics were significantly associated with a different relative effect of TPA. Older patients and those with anterior infarction, higher Killip classification (except Killip class IV), lower blood pressure, and increased heart rate had the greatest absolute benefit with accelerated TPA. Patients with acute myocardial infarction who had more high-risk characteristics derived a greater absolute benefit from treatment with accelerated TPA versus streptokinase