14 research outputs found
Outcomes of chronic total occlusion percutaneous coronary intervention from the RAIAN (RAjaie - Iran) registry
Objective: While most of the evidence in CTO interventions emerge from Western and Japanese studies, few data have been published up today from the Middle East. Objective of this study was to evaluate technical success rates and clinical outcomes of an Iranian population undergoing CTO PCI in a tertiary referral hospital. Moreover, we sought to evaluate the efficacy of our CTO teaching program. Methods: This is a retrospective single-center cohort study including 790 patients who underwent CTO PCI performed by operators with different volumes of CTOs PCI performed per year. According to PCI result, all patients have been divided into successful (n = 555, 70.3 %) and unsuccessful (n = 235, 29.7 %) groups. Study endpoints were Major Adverse Cardiovascular Events and Health Status Improvement evaluated using the Seattle Angina Questionnaire at one year. Results: A global success rate of 70 % for antegrade and 80 % for retrograde approach was shown despite the lack of some CTO-dedicated devices. During the enrollment period, the success rate increased significantly among operators with a lower number of CTO procedures per year. One-year MACE rate was similar in both successful and unsuccessful groups (13.5 % in successful and 10.6 % in unsuccessful group, p = 0.173). One year patients' health status improved significantly only in successful group. Conclusions: No significant differences of in-hospital and one-year MACE were found between the successful and unsuccessful groups. Angina symptoms and quality of life significantly improved after successful CTO PCI. The RAIAN registry confirmed the importance of operator expertise for CTO PCI success
Structural insight into the membrane targeting domain of the Legionella deAMPylase SidD
AMPylation, the post-translational modification with adenosine monophosphate (AMP), is catalyzed by effector proteins from a variety of pathogens. Legionella pneumophila is thus
far the only known pathogen that, in addition to encoding an AMPylase (SidM/DrrA), also
encodes a deAMPylase, called SidD, that reverses SidM-mediated AMPylation of the vesicle
transport GTPase Rab1. DeAMPylation is catalyzed by the N-terminal phosphatase-like
domain of SidD. Here, we determined the crystal structure of full length SidD including the
uncharacterized C-terminal domain (CTD). A flexible loop rich in aromatic residues within
the CTD was required to target SidD to model membranes in vitro and to the Golgi apparatus
within mammalian cells. Deletion of the loop (??loop) or substitution of its aromatic phenylalanine
residues rendered SidD cytosolic, showing that the hydrophobic loop is the
primary membrane-targeting determinant of SidD. Notably, deletion of the two terminal
alpha helices resulted in a CTD variant incapable of discriminating between membranes of
different composition. Moreover, a L. pneumophila strain producing SidD??loop phenocopied
a L. pneumophila ??sidD strain during growth in mouse macrophages and displayed prolonged
co-localization of AMPylated Rab1 with LCVs, thus revealing that membrane targeting
of SidD via its CTD is a critical prerequisite for its ability to catalyze Rab1 deAMPylation
during L. pneumophila infection