Institution
Icahn School of Medicine at Mount Sinai
Education•New York, New York, United States•
About: Icahn School of Medicine at Mount Sinai is a education organization based out in New York, New York, United States. It is known for research contribution in the topics: Population & Medicine. The organization has 37488 authors who have published 76057 publications receiving 3704104 citations. The organization is also known as: Mount Sinai School of Medicine.
Topics: Population, Medicine, Cancer, Health care, Transplantation
Papers published on a yearly basis
Papers
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TL;DR: It is reported here that high expression of this altered gene in the central nervous systems of transgenic mice is associated with an age-related rapidly progressive decline of motor function accompanied by degenerative changes of motoneurons within the spinal cord, brain stem, and neocortex, indicating a causative relationship between altered SOD activity and motoneuron degeneration.
Abstract: Amyotrophic lateral sclerosis is a progressive neurodegenerative disorder primarily involving motoneurons. A subset of individuals with familial autosomal dominant forms of the disease have mutations of the copper/zinc superoxide dismutase (Cu/Zn SOD, SOD-1) gene, which encodes a ubiquitously expressed enzyme that plays a key role in oxygen free radical scavenging. This observation suggests that altered or reduced SOD-1 activity may play a role in the neurodegenerative process. To explore this possibility further, we have introduced a mutation into the mouse SOD-1 gene that corresponds to one of the changes found in the human gene in familial amyotrophic lateral sclerosis. Integration and expression of this mouse gene in transgenic mice was identified by the presence of a unique restriction enzyme site in the transgene coding sequence generated by introduction of the mutation. We report here that high expression of this altered gene in the central nervous systems of transgenic mice is associated with an age-related rapidly progressive decline of motor function accompanied by degenerative changes of motoneurons within the spinal cord, brain stem, and neocortex. These findings indicate a causative relationship between altered SOD activity and motoneuron degeneration. Moreover, biochemical studies indicate normal levels of total SOD activity in transgenic mouse tissues, results that indicate that the neurodegenerative disorder does not result from a diminution of activity and, as such, represents a dominant "gain of function" mutation.
703 citations
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TL;DR: How recent insights into the structure and function of key molecules and their regulators reveal novel strategies of bacterial pH homeostasis may help to target certain pathogens more accurately and to harness the capacities of environmental bacteria more efficiently is described.
Abstract: In this Review, Krulwich, Sachs and Padan describe how the evolution of diverse mechanisms for pH sensing and homeostasis has enabled bacteria to survive sudden changes in external pH and to grow in environments with external pH values that would otherwise be toxic.
703 citations
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TL;DR: This review summarizes the current understanding of the mechanisms contributing to ROS-related changes in key stress activated signaling cascades and involves direct alteration of kinases and transcription factors, and indirect modulation of cysteine-rich redox-sensitive proteins exemplified by thioredoxin and glutathione S-transferase.
Abstract: Stress-activated signaling cascades are affected by altered redox potential. Key contributors to altered redox potential are reactive oxygen species (ROS) which are formed, in most cases, by exogenous genotoxic agents including irradiation, inflammatory cytokines and chemical carcinogens. ROS and altered redox potential can be considered as the primary intracellular changes which regulate protein kinases, thereby serving as an important cellular component linking external stimuli with signal transduction in stress response. The mechanisms, which underlie the ROS-mediated response, involve direct alteration of kinases and transcription factors, and indirect modulation of cysteine-rich redox-sensitive proteins exemplified by thioredoxin and glutathione S-transferase. This review summarizes the current understanding of the mechanisms contributing to ROS-related changes in key stress activated signaling cascades.
702 citations
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TL;DR: The crystal structure at 2.0-Å resolution of active-site-inhibited factor VIIa complexed with the cleaved extracellular domain of tissue factor provides a basis for understanding many molecular aspects of the initiation of coagulation.
Abstract: Blood coagulation is initiated when tissue factor binds to coagulation factor Vila to give an enzymatically active complex which then activates factors IX and X, leading to thrombin generation and clot formation. We have determined the crystal structure at 2.0-A resolution of active-site-inhibited factor VIIa complexed with the cleaved extracellular domain of tissue factor. In the complex, factor VIIa adopts an extended conformation. This structure provides a basis for understanding many molecular aspects of the initiation of coagulation.
702 citations
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TL;DR: The spectrum and distribution of PTPN11 mutations in a large, well-characterized cohort with NS revealed that pulmonic stenosis was more prevalent among the group of subjects with NS who had PTP N11 mutations than it was in the group without them, andotype-phenotype analysis revealed that hypertrophic cardiomyopathy was less prevalent among those with PTPn11 mutations.
Abstract: Noonan syndrome (NS) is a developmental disorder characterized by facial dysmorphia, short stature, cardiac defects, and skeletal malformations. We recently demonstrated that mutations in PTPN11, the gene encoding the non-receptor-type protein tyrosine phosphatase SHP-2 (src homology region 2-domain phosphatase-2), cause NS, accounting for approximately 50% of cases of this genetically heterogeneous disorder in a small cohort. All mutations were missense changes and clustered at the interacting portions of the amino-terminal src-homology 2 (N-SH2) and protein tyrosine phosphatase (PTP) domains. A gain of function was postulated as a mechanism for the disease. Here, we report the spectrum and distribution of PTPN11 mutations in a large, well-characterized cohort with NS. Mutations were found in 54 of 119 (45%) unrelated individuals with sporadic or familial NS. There was a significantly higher prevalence of mutations among familial cases than among sporadic ones. All defects were missense, and several were recurrent. The vast majority of mutations altered amino acid residues located in or around the interacting surfaces of the N-SH2 and PTP domains, but defects also affected residues in the C-SH2 domain, as well as in the peptide linking the N-SH2 and C-SH2 domains. Genotype-phenotype analysis revealed that pulmonic stenosis was more prevalent among the group of subjects with NS who had PTPN11 mutations than it was in the group without them (70.6% vs. 46.2%; P<.01), whereas hypertrophic cardiomyopathy was less prevalent among those with PTPN11 mutations (5.9% vs. 26.2%; P<.005). The prevalence of other congenital heart malformations, short stature, pectus deformity, cryptorchidism, and developmental delay did not differ between the two groups. A PTPN11 mutation was identified in a family inheriting Noonan-like/multiple giant-cell lesion syndrome, extending the phenotypic range of disease associated with this gene.
702 citations
Authors
Showing all 37948 results
Name | H-index | Papers | Citations |
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Robert Langer | 281 | 2324 | 326306 |
Shizuo Akira | 261 | 1308 | 320561 |
Gordon H. Guyatt | 231 | 1620 | 228631 |
Eugene Braunwald | 230 | 1711 | 264576 |
Bruce S. McEwen | 215 | 1163 | 200638 |
Robert J. Lefkowitz | 214 | 860 | 147995 |
Peter Libby | 211 | 932 | 182724 |
Mark J. Daly | 204 | 763 | 304452 |
Stuart H. Orkin | 186 | 715 | 112182 |
Paul G. Richardson | 183 | 1533 | 155912 |
Alan C. Evans | 183 | 866 | 134642 |
John C. Morris | 183 | 1441 | 168413 |
Paul M. Thompson | 183 | 2271 | 146736 |
Tadamitsu Kishimoto | 181 | 1067 | 130860 |
Bruce M. Psaty | 181 | 1205 | 138244 |