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  • 1
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    Cyclic dermal BMP signalling regulates stem cell activation during hair regeneration (2008)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2008-01-19
    Description: In the age of stem cell engineering it is critical to understand how stem cell activity is regulated during regeneration. Hairs are mini-organs that undergo cyclic regeneration throughout adult life, and are an important model for organ regeneration. Hair stem cells located in the follicle bulge are regulated by the surrounding microenvironment, or niche. The activation of such stem cells is cyclic, involving periodic beta-catenin activity. In the adult mouse, regeneration occurs in waves in a follicle population, implying coordination among adjacent follicles and the extrafollicular environment. Here we show that unexpected periodic expression of bone morphogenetic protein 2 (Bmp2) and Bmp4 in the dermis regulates this process. This BMP cycle is out of phase with the WNT/beta-catenin cycle, thus dividing the conventional telogen into new functional phases: one refractory and the other competent for hair regeneration, characterized by high and low BMP signalling, respectively. Overexpression of noggin, a BMP antagonist, in mouse skin resulted in a markedly shortened refractory phase and faster propagation of the regenerative wave. Transplantation of skin from this mutant onto a wild-type host showed that follicles in donor and host can affect their cycling behaviours mutually, with the outcome depending on the equilibrium of BMP activity in the dermis. Administration of BMP4 protein caused the competent region to become refractory. These results show that BMPs may be the long-sought 'chalone' inhibitors of hair growth postulated by classical experiments. Taken together, results presented in this study provide an example of hierarchical regulation of local organ stem cell homeostasis by the inter-organ macroenvironment. The expression of Bmp2 in subcutaneous adipocytes indicates physiological integration between these two thermo-regulatory organs. Our findings have practical importance for studies using mouse skin as a model for carcinogenesis, intra-cutaneous drug delivery and stem cell engineering studies, because they highlight the acute need to differentiate supportive versus inhibitory regions in the host skin.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2696201/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2696201/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Plikus, Maksim V -- Mayer, Julie Ann -- de la Cruz, Damon -- Baker, Ruth E -- Maini, Philip K -- Maxson, Robert -- Chuong, Cheng-Ming -- R01 AR042177/AR/NIAMS NIH HHS/ -- R01 AR042177-13/AR/NIAMS NIH HHS/ -- R01 AR042177-14/AR/NIAMS NIH HHS/ -- R01 AR047364/AR/NIAMS NIH HHS/ -- R01 AR047364-05/AR/NIAMS NIH HHS/ -- R01 AR047364-06/AR/NIAMS NIH HHS/ -- England -- Nature. 2008 Jan 17;451(7176):340-4. doi: 10.1038/nature06457.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology, Keck School of Medicine, University of Southern California, Los Angeles, California 90033, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18202659" target="_blank"〉PubMed〈/a〉
    Keywords: Adipose Tissue/metabolism ; Animals ; Bone Morphogenetic Protein 2 ; Bone Morphogenetic Protein 4 ; Bone Morphogenetic Proteins/*metabolism ; Carrier Proteins/genetics/metabolism ; Dermis/cytology/*metabolism/transplantation ; Hair/cytology/*growth & development ; Hair Follicle/cytology/metabolism ; Mice ; Mice, Inbred Strains ; Regeneration/*physiology ; *Signal Transduction ; Stem Cells/*cytology/metabolism ; Transforming Growth Factor beta/*metabolism ; Wnt Proteins/metabolism ; beta Catenin/metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 2
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    Structure of a beta1-adrenergic G-protein-coupled receptor (2008)
    Nature Publishing Group (NPG)
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    Publication Date: 2008-07-03
    Description: G-protein-coupled receptors have a major role in transmembrane signalling in most eukaryotes and many are important drug targets. Here we report the 2.7 A resolution crystal structure of a beta(1)-adrenergic receptor in complex with the high-affinity antagonist cyanopindolol. The modified turkey (Meleagris gallopavo) receptor was selected to be in its antagonist conformation and its thermostability improved by earlier limited mutagenesis. The ligand-binding pocket comprises 15 side chains from amino acid residues in 4 transmembrane alpha-helices and extracellular loop 2. This loop defines the entrance of the ligand-binding pocket and is stabilized by two disulphide bonds and a sodium ion. Binding of cyanopindolol to the beta(1)-adrenergic receptor and binding of carazolol to the beta(2)-adrenergic receptor involve similar interactions. A short well-defined helix in cytoplasmic loop 2, not observed in either rhodopsin or the beta(2)-adrenergic receptor, directly interacts by means of a tyrosine with the highly conserved DRY motif at the end of helix 3 that is essential for receptor activation.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2923055/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2923055/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Warne, Tony -- Serrano-Vega, Maria J -- Baker, Jillian G -- Moukhametzianov, Rouslan -- Edwards, Patricia C -- Henderson, Richard -- Leslie, Andrew G W -- Tate, Christopher G -- Schertler, Gebhard F X -- MC_U105178937/Medical Research Council/United Kingdom -- MC_U105184322/Medical Research Council/United Kingdom -- MC_U105184325/Medical Research Council/United Kingdom -- MC_U105197215/Medical Research Council/United Kingdom -- U.1051.04.020(78937)/Medical Research Council/United Kingdom -- Wellcome Trust/United Kingdom -- England -- Nature. 2008 Jul 24;454(7203):486-91. doi: 10.1038/nature07101. Epub 2008 Jun 25.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉MRC Laboratory of Molecular Biology, Hills Road, Cambridge CB2 0QH, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18594507" target="_blank"〉PubMed〈/a〉
    Keywords: Adrenergic beta-1 Receptor Agonists ; Adrenergic beta-1 Receptor Antagonists ; Adrenergic beta-Antagonists/chemistry/metabolism ; Amino Acid Motifs ; Animals ; Binding Sites ; Crystallization ; Crystallography, X-Ray ; Ligands ; Models, Molecular ; Mutant Proteins/chemistry/genetics/metabolism ; Mutation ; Pindolol/analogs & derivatives/chemistry/metabolism ; Propanolamines/chemistry/metabolism ; Protein Conformation ; Receptors, Adrenergic, beta-1/*chemistry/metabolism ; Thermodynamics ; Turkeys
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 3
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    Melanoma in mice casts doubt on scarcity of cancer stem cells (2008)
    Nature Publishing Group (NPG)
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    Publication Date: 2008-12-05
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Baker, Monya -- England -- Nature. 2008 Dec 4;456(7222):553. doi: 10.1038/456553a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19052589" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Cell Count ; Cell Proliferation ; Cell Survival ; Humans ; Melanoma/drug therapy/*pathology ; Mice ; Neoplasm Transplantation ; Neoplastic Stem Cells/drug effects/*pathology/transplantation ; Regeneration
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 4
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    Nerve cells made from elderly patient's skin cells (2008)
    Nature Publishing Group (NPG)
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    Publication Date: 2008-08-08
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Baker, Monya -- England -- Nature. 2008 Aug 7;454(7205):675. doi: 10.1038/454675b.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18685662" target="_blank"〉PubMed〈/a〉
    Keywords: Aged, 80 and over ; Amyotrophic Lateral Sclerosis/genetics/*pathology/surgery ; Animals ; Cellular Reprogramming ; Disease Models, Animal ; Female ; Humans ; Male ; Mice ; Neurons/*cytology/metabolism/transplantation ; Pluripotent Stem Cells/*cytology/metabolism/transplantation ; Skin/*cytology/metabolism ; Stem Cell Transplantation/contraindications
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 5
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    Cell therapy: being patient (2008)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2008-10-04
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Baker, Monya -- England -- Nature. 2008 Oct 2;455(7213):586-8. doi: 10.1038/455586a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18833248" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Cell- and Tissue-Based Therapy ; Embryonic Stem Cells ; Graft Survival ; Humans ; Mice ; Pluripotent Stem Cells ; Regenerative Medicine ; Research Personnel ; *Stem Cell Transplantation
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 6
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    FDA to vet embryonic stem cells' safety (2008)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2008-04-11
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Baker, Monya -- England -- Nature. 2008 Apr 10;452(7188):670. doi: 10.1038/452670a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18401364" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Adult Stem Cells ; Animals ; Clinical Trials as Topic/*legislation & jurisprudence/standards/trends ; Embryonic Stem Cells/*transplantation ; Fetal Stem Cells ; Humans ; Models, Animal ; Safety/*legislation & jurisprudence ; United States ; United States Food and Drug Administration/*legislation & jurisprudence
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 7
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    Bioactive contaminants leach from disposable laboratory plasticware (2008)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2008-11-08
    Description: Disposable plasticware such as test tubes, pipette tips, and multiwell assay or culture plates are used routinely in most biological research laboratories. Manufacturing of plastics requires the inclusion of numerous chemicals to enhance stability, durability, and performance. Some lubricating (slip) agents, exemplified by oleamide, also occur endogenously in humans and are biologically active, and cationic biocides are included to prevent bacterial colonization of the plastic surface. We demonstrate that these manufacturing agents leach from laboratory plasticware into a standard aqueous buffer, dimethyl sulfoxide, and methanol and can have profound effects on proteins and thus on results from bioassays of protein function. These findings have far-reaching implications for the use of disposable plasticware in biological research.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉McDonald, G Reid -- Hudson, Alan L -- Dunn, Susan M J -- You, Haitao -- Baker, Glen B -- Whittal, Randy M -- Martin, Jonathan W -- Jha, Amitabh -- Edmondson, Dale E -- Holt, Andrew -- New York, N.Y. -- Science. 2008 Nov 7;322(5903):917. doi: 10.1126/science.1162395.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pharmacology, University of Alberta, Edmonton, AB T6G 2B7, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18988846" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Dimethyl Sulfoxide ; Disinfectants/*analysis/pharmacology ; *Disposable Equipment ; Humans ; *Laboratories ; Monoamine Oxidase/*metabolism ; Monoamine Oxidase Inhibitors/pharmacology ; Oleic Acids/*analysis/pharmacology ; Plastics/*chemistry ; Quaternary Ammonium Compounds/*analysis/pharmacology ; Rats ; Solvents
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
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    Science and government. An Earth systems science agency (2008)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2008-07-05
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schaefer, Mark -- Baker, D James -- Gibbons, John H -- Groat, Charles G -- Kennedy, Donald -- Kennel, Charles F -- Rejeski, David -- New York, N.Y. -- Science. 2008 Jul 4;321(5885):44-5. doi: 10.1126/science.1160192.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18599760" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Atmosphere ; Biodiversity ; Conservation of Natural Resources ; Ecology ; Fresh Water ; Geological Phenomena ; Geology ; Oceanography ; Oceans and Seas ; *Public Policy ; United States ; United States Government Agencies/*organization & administration
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 9
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    An inhibitor of FtsZ with potent and selective anti-staphylococcal activity (2008)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2008-09-20
    Description: FtsZ is an essential bacterial guanosine triphosphatase and homolog of mammalian beta-tubulin that polymerizes and assembles into a ring to initiate cell division. We have created a class of small synthetic antibacterials, exemplified by PC190723, which inhibits FtsZ and prevents cell division. PC190723 has potent and selective in vitro bactericidal activity against staphylococci, including methicillin- and multi-drug-resistant Staphylococcus aureus. The putative inhibitor-binding site of PC190723 was mapped to a region of FtsZ that is analogous to the Taxol-binding site of tubulin. PC190723 was efficacious in an in vivo model of infection, curing mice infected with a lethal dose of S. aureus. The data validate FtsZ as a target for antibacterial intervention and identify PC190723 as suitable for optimization into a new anti-staphylococcal therapy.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Haydon, David J -- Stokes, Neil R -- Ure, Rebecca -- Galbraith, Greta -- Bennett, James M -- Brown, David R -- Baker, Patrick J -- Barynin, Vladimir V -- Rice, David W -- Sedelnikova, Sveta E -- Heal, Jonathan R -- Sheridan, Joseph M -- Aiwale, Sachin T -- Chauhan, Pramod K -- Srivastava, Anil -- Taneja, Amit -- Collins, Ian -- Errington, Jeff -- Czaplewski, Lloyd G -- Biotechnology and Biological Sciences Research Council/United Kingdom -- Wellcome Trust/United Kingdom -- New York, N.Y. -- Science. 2008 Sep 19;321(5896):1673-5. doi: 10.1126/science.1159961.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Prolysis, Begbroke Science Park, Oxfordshire OX5 1PF, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18801997" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Anti-Bacterial Agents/*pharmacology/therapeutic use ; Bacillus subtilis/chemistry/*drug effects/genetics ; Bacterial Proteins/*antagonists & inhibitors/chemistry/genetics/metabolism ; Binding Sites ; Cell Division/drug effects ; Crystallography, X-Ray ; Cytoskeletal Proteins/*antagonists & inhibitors/chemistry/genetics/metabolism ; Drug Resistance, Bacterial/genetics ; Drug Resistance, Multiple, Bacterial ; Ligands ; Methicillin Resistance ; Mice ; Microbial Sensitivity Tests ; Models, Molecular ; Molecular Sequence Data ; Mutation ; Protein Conformation ; Pyridines/chemistry/metabolism/*pharmacology/therapeutic use ; Staphylococcal Infections/*drug therapy ; Staphylococcus aureus/chemistry/*drug effects ; Thiazoles/chemistry/metabolism/*pharmacology/therapeutic use ; Tubulin/chemistry/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
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    Evolutionary origins for social vocalization in a vertebrate hindbrain-spinal compartment (2008)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2008-07-19
    Description: The macroevolutionary events leading to neural innovations for social communication, such as vocalization, are essentially unexplored. Many fish vocalize during female courtship and territorial defense, as do amphibians, birds, and mammals. Here, we map the neural circuitry for vocalization in larval fish and show that the vocal network develops in a segment-like region across the most caudal hindbrain and rostral spinal cord. Taxonomic analysis demonstrates a highly conserved pattern between fish and all major lineages of vocal tetrapods. We propose that the vocal basis for acoustic communication among vertebrates evolved from an ancestrally shared developmental compartment already present in the early fishes.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2582147/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2582147/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bass, Andrew H -- Gilland, Edwin H -- Baker, Robert -- R01 DC000092/DC/NIDCD NIH HHS/ -- R01 DC000092-33/DC/NIDCD NIH HHS/ -- New York, N.Y. -- Science. 2008 Jul 18;321(5887):417-21. doi: 10.1126/science.1157632.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurobiology and Behavior, Cornell University, Ithaca, NY 14853, USA. ahb3@cornell.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18635807" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Batrachoidiformes/*anatomy & histology/growth & development/physiology ; *Biological Evolution ; Cerebellum/cytology/growth & development ; Motor Neurons/*cytology ; Nerve Net/*cytology/growth & development ; Neurons/*cytology ; Rhombencephalon/*cytology/growth & development ; Spinal Cord/*cytology/growth & development ; Vagus Nerve/cytology ; Vertebrates/anatomy & histology/growth & development/physiology ; *Vocalization, Animal
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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