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Conversion of Ras proteins into an activated GTP-bound state able to bind effector proteins is catalyzed by specific guanine nucleotide exchange factors in response to a large number of extracellular stimuli. Here we report the isolation of mouse cDNAs encoding Ras-GRF2, a multidomain 135-kDa protein containing a COOH-terminal Cdc25-related domain that(More)
The polymerase chain reaction was used to amplify a cDNA encoding the catalytic region of ras-guanine nucleotide release factor (ras-GRF1) from mouse embryonic stem cell mRNA. Antibodies directed against this protein were prepared and affinity purified. Western immunoblotting of rat tissue lysates revealed a 140-kDa protein in brain as expected but, in(More)
OBJECTIVES The study aimed to determine the mechanism and predictors of procedural failure in patients undergoing percutaneous coronary intervention (PCI) from the transradial approach (TR). BACKGROUND Transradial approach PCI reduces vascular complications compared with a transfemoral approach (TF). However, the mechanism and predictors of TR-PCI failure(More)
Transcatheter aortic valve implantation (TAVI) has demonstrated the feasibility of treating valvular heart disease with transcatheter therapy. On the back of this success, various transcatheter concepts are being evaluated to treat other valvular disease, especially mitral regurgitation (MR). The concepts currently approved to treat MR replicate surgical(More)
BACKGROUND Transradial percutaneous coronary intervention (TR-PCI) improves clinical outcomes compared to the transfemoral (TF) approach. However, inadequate training and experience has limited widespread adoption by interventional cardiologists. METHODS AND RESULTS Clinical and procedural characteristics for TR-PCI were prospectively collected from 1999(More)
C ase Presentation: J.A. is a 63-year-old man with type II diabetes and hypercholesterol-emia. He has suffered 2 previous myocardial infarctions and has chronic angina. Previous angiography showed diffuse 3-vessel coronary artery disease not amenable to conventional re-vascularization. What are the current concepts surrounding the use of therapeutic(More)
Ras and Rac are membrane-associated GTPases that function as molecular switches activating intracellular mitogen-activated protein kinase (MAPK) cascades and other effector pathways in response to extracellular signals [1]. Activation of Ras and Rac into their GTP-bound conformations is directly controlled by specific guanine-nucleotide exchange factors(More)
AIM High-density lipoproteins (HDLs) have several potentially protective vascular effects. Most clinical studies of therapies targeting HDL have failed to show benefits vs. placebo. OBJECTIVE To investigate the effects of an HDL-mimetic agent on atherosclerosis by intravascular ultrasonography (IVUS) and quantitative coronary angiography (QCA). DESIGN(More)
OBJECTIVES The purpose of this study was to characterize clopidogrel hypersensitivity and describe its successful management with oral steroids without clopidogrel discontinuation. BACKGROUND Hypersensitivity reactions to clopidogrel are poorly understood and present difficulty in management. METHODS Patients diagnosed with clopidogrel hypersensitivity(More)
BACKGROUND Despite valuable supplemental training resources for surgical skill acquisition, utility of virtual reality simulators to improve skills relevant to performing cardiac catheterization has not been evaluated. METHODS AND RESULTS Post baseline cardiac catheterization performance assessment, 27 cardiology trainees were randomized to either(More)