Institution
Johns Hopkins University School of Medicine
Healthcare•Baltimore, Maryland, United States•
About: Johns Hopkins University School of Medicine is a healthcare organization based out in Baltimore, Maryland, United States. It is known for research contribution in the topics: Population & Cancer. The organization has 44277 authors who have published 79222 publications receiving 4788882 citations.
Topics: Population, Cancer, Transplantation, Prostate cancer, Poison control
Papers published on a yearly basis
Papers
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TL;DR: Ex vivo endogenous H2S physiologically modifies cysteine residues in many proteins, including glyceraldehyde-3-phosphate dehydrogenase (GAPDH) and actin, converting Cysteine -SH groups to -SSH groups in a process the authors call S-sulfhydration.
Abstract: Hydrogen sulfide (H2S), a messenger molecule generated by cystathionine gamma-lyase, acts as a physiologic vasorelaxant. Mechanisms whereby H2S signals have been elusive. We now show that H2S physiologically modifies cysteines in a large number of proteins by S-sulfhydration. About 10 to 25% of many liver proteins, including actin, tubulin, and glyceraldehyde-3-phosphate dehydrogenase (GAPDH), are sulfhydrated under physiological conditions. Sulfhydration augments GAPDH activity and enhances actin polymerization. Sulfhydration thus appears to be a physiologic posttranslational modification for proteins.
1,027 citations
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TL;DR: It is shown here that NSC-derived (and LacZ-transfected), magnetically labeled oligodendroglial progenitors can be readily detected in vivo at least as long as six weeks after transplantation, with an excellent correlation between the obtained MR contrast and staining for β-galactosidase expression.
Abstract: Magnetic resonance (MR) tracking of magnetically labeled stem and progenitor cells is an emerging technology, leading to an urgent need for magnetic probes that can make cells highly magnetic during their normal expansion in culture. We have developed magnetodendrimers as a versatile class of magnetic tags that can efficiently label mammalian cells, including human neural stem cells (NSCs) and mesenchymal stem cells (MSCs), through a nonspecific membrane adsorption process with subsequent intracellular (non-nuclear) localization in endosomes. The superparamagnetic iron oxide nanocomposites have been optimized to exhibit superior magnetic properties and to induce sufficient MR cell contrast at incubated doses as low as 1 microg iron/ml culture medium. When containing between 9 and 14 pg iron/cell, labeled cells exhibit an ex vivo nuclear magnetic resonance (NMR) relaxation rate (1/T2) as high as 24-39 s-1/mM iron. Labeled cells are unaffected in their viability and proliferating capacity, and labeled human NSCs differentiate normally into neurons. Furthermore, we show here that NSC-derived (and LacZ-transfected), magnetically labeled oligodendroglial progenitors can be readily detected in vivo at least as long as six weeks after transplantation, with an excellent correlation between the obtained MR contrast and staining for beta-galactosidase expression. The availability of magnetodendrimers opens up the possibility of MR tracking of a wide variety of (stem) cell transplants.
1,026 citations
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TL;DR: It is found that high-frequency stimulation of the perforant path-granule cell (pp-gc) synapse markedly increases zif/268 messenger RNA levels in the ipsilateral granule cell neurons; mRNA of c-fos, c-jun and jun-B is less consistently increased.
Abstract: Recent studies in invertebrates indicate that a rapid genomic response to neuronal stimulation has a critical role in long-term changes in synaptic efficacy. Because several of the genes (immediately early genes; IEGs) that respond rapidly to growth factor stimulation of vertebrate cells in vitro are also activated by neuronal stimulation in vivo, attention has focused on the possibility that they play a part in synaptic plasticity in vertebrate nervous systems. Four IEGs thought to encode transcription factors, zif/268 (also termed Egr-1, NGFI-A, Krox 24), c-fos, c-jun, and jun-B are rapidly induced in the brain by seizure activity, and we have now studied the induction of these genes in a well-characterized model of synaptic plasticity in the vertebrate brain--long-term potentiation (LTP) of the perforant pathgranule cell (pp-gc) synapse in vivo. We found that high-frequency (but not low-frequency) stimulation of the pp-gc synapse markedly increases zif/268 messenger RNA (mRNA) levels in the ipsilateral granule cell neurons; mRNA of c-fos, c-jun and jun-B is less consistently increased. The stimulus frequency and intensity required to increase zif/268 mRNA levels are similar to those required to induce LTP, which is also seen only ipsilaterally, and both responses are blocked by NMDA-receptor antagonists as well as by convergent synaptic inhibitory inputs already known to block LTP. Accordingly, zif/268 mRNA levels and LTP seem to be regulated by similar synaptic mechanisms.
1,025 citations
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TL;DR: The data indicate that, while average telomere length is measured in most studies, it is not the average but rather the shortest telomeres that constitute telomerre dysfunction and limit cellular survival in the absence of telomerase.
1,019 citations
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Johns Hopkins University School of Medicine1, Harvard University2, University of Alberta3, University of Basel4, University of California, Los Angeles5, Catholic University of Leuven6, University of Pittsburgh7, Vanderbilt University8, University of Leicester9, University of Helsinki10, University of Iowa11, Yale University12, University of Texas Health Science Center at Houston13, Nagoya City University14, University of North Carolina at Chapel Hill15, University of Vienna16, University of Barcelona17, Cornell University18, Rockyview General Hospital19
TL;DR: This article presents international consensus criteria for and classification of AbAR developed based on discussions held at the Sixth Banff Conference on Allograft Pathology in 2001, to be revisited as additional data accumulate in this important area of renal transplantation.
1,018 citations
Authors
Showing all 44754 results
Name | H-index | Papers | Citations |
---|---|---|---|
Robert Langer | 281 | 2324 | 326306 |
Bert Vogelstein | 247 | 757 | 332094 |
Solomon H. Snyder | 232 | 1222 | 200444 |
Steven A. Rosenberg | 218 | 1204 | 199262 |
Kenneth W. Kinzler | 215 | 640 | 243944 |
Hagop M. Kantarjian | 204 | 3708 | 210208 |
Mark P. Mattson | 200 | 980 | 138033 |
Stuart H. Orkin | 186 | 715 | 112182 |
Paul G. Richardson | 183 | 1533 | 155912 |
Aaron R. Folsom | 181 | 1118 | 134044 |
Gonçalo R. Abecasis | 179 | 595 | 230323 |
Jie Zhang | 178 | 4857 | 221720 |
Daniel R. Weinberger | 177 | 879 | 128450 |
David Baker | 173 | 1226 | 109377 |
Eliezer Masliah | 170 | 982 | 127818 |