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  • 1
    Publication Date: 1998-05-23
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Agosto, M -- Allan, J -- Benson, C -- Berger, E A -- Blumenthal, R -- Burton, D -- Clements, J -- Coffin, J -- Connor, R -- Cullen, B -- Desrosiers, R -- Dimitrov, D -- Doms, R -- Emerman, M -- Feinberg, M -- Fultz, P -- Gerard, C -- Gonsalves, G -- Haase, A -- Haigwood, N -- Hirsch, V -- Ho, D -- Hoxie, J A -- Hu, S L -- Zingale, D -- New York, N.Y. -- Science. 1998 May 8;280(5365):803, 804-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9599148" target="_blank"〉PubMed〈/a〉
    Keywords: *AIDS Vaccines/immunology ; Acquired Immunodeficiency Syndrome/prevention & control ; *Clinical Trials as Topic ; HIV Envelope Protein gp120/immunology ; HIV-1/immunology ; Humans ; National Institutes of Health (U.S.) ; United States
    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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  • 2
    Publication Date: 1999-03-19
    Description: Structural maturation of fiber tracts in the human brain, including an increase in the diameter and myelination of axons, may play a role in cognitive development during childhood and adolescence. A computational analysis of structural magnetic resonance images obtained in 111 children and adolescents revealed age-related increases in white matter density in fiber tracts constituting putative corticospinal and frontotemporal pathways. The maturation of the corticospinal tract was bilateral, whereas that of the frontotemporal pathway was found predominantly in the left (speech-dominant) hemisphere. These findings provide evidence for a gradual maturation, during late childhood and adolescence, of fiber pathways presumably supporting motor and speech functions.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Paus, T -- Zijdenbos, A -- Worsley, K -- Collins, D L -- Blumenthal, J -- Giedd, J N -- Rapoport, J L -- Evans, A C -- New York, N.Y. -- Science. 1999 Mar 19;283(5409):1908-11.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Montreal Neurological Institute, McGill University, 3801 University Street, Montreal, Quebec H3A 2B4, Canada. tomas@bic.mni.mcgill.ca〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10082463" target="_blank"〉PubMed〈/a〉
    Keywords: Adolescent ; *Aging ; Axons/physiology/ultrastructure ; Brain/anatomy & histology/*growth & development ; Brain Mapping ; Child ; Child, Preschool ; Female ; Frontal Lobe/anatomy & histology/growth & development ; Humans ; Magnetic Resonance Imaging ; Male ; Motor Skills ; Myelin Sheath/ultrastructure ; Nerve Fibers/ultrastructure ; Neural Conduction ; Neural Pathways/anatomy & histology/*growth & development ; Regression Analysis ; Speech ; Spinal Cord/anatomy & histology ; Synaptic Transmission ; Temporal Lobe/anatomy & histology/growth & development
    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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  • 3
    Publication Date: 1991-09-20
    Description: A human intestinal intraepithelial lymphocyte (IEL) T cell line was established from jejunum to characterize the structure and function of the alpha beta T cell antigen receptors (TCRs) expressed by this population. Single-sided polymerase chain reaction (PCR) amplification cloning and quantitative PCR amplification of the TCR chains from the cell line and from fresh IELs demonstrated that IELs were oligoclonal. The IEL T cell line exhibited CD1-specific cytotoxicity and a dominant IEL T cell clone was CD1c-specific. Thus, human jejunal intraepithelial lymphocytes are oligoclonal and recognize members of the CD1 gene family.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Balk, S P -- Ebert, E C -- Blumenthal, R L -- McDermott, F V -- Wucherpfennig, K W -- Landau, S B -- Blumberg, R S -- 5 KO8 DK01886/DK/NIDDK NIH HHS/ -- CA-01310/CA/NCI NIH HHS/ -- DK42166/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 1991 Sep 20;253(5026):1411-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Hematology-Oncology Division, Beth Israel Hospital, Harvard Medical School, Boston, MA 02215.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1716785" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Antigens, CD/*genetics/immunology ; Antigens, CD1 ; Base Sequence ; Cell Line ; Clone Cells ; Epithelium/physiology ; Humans ; Jejunum/immunology ; Molecular Sequence Data ; Oligonucleotide Probes ; Polymerase Chain Reaction/methods ; Receptors, Antigen, T-Cell/*genetics ; T-Lymphocytes/*immunology
    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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  • 4
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2008-09-06
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rowley, Janet D -- Blumenthal, Thomas -- New York, N.Y. -- Science. 2008 Sep 5;321(5894):1302-4. doi: 10.1126/science.1163791.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Medicine, University of Chicago, 5841 South Maryland Avenue, MC 2115, Chicago, IL 60637, USA. jrowley@medicine.bsd.uchicago.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18772424" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Line ; Chromosomes, Human, Pair 17/genetics ; Chromosomes, Human, Pair 7/genetics ; Endometrial Neoplasms/genetics ; Endometrium/cytology/*metabolism ; Female ; Gene Fusion ; Gene Rearrangement ; Humans ; Macaca mulatta ; Menstrual Cycle ; Neoplasm Proteins/*genetics ; RNA, Guide/genetics ; RNA, Messenger/*genetics ; *Trans-Splicing ; Transcription Factors/*genetics ; *Translocation, Genetic
    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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  • 5
    Publication Date: 2013-05-21
    Description: 〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3772710/" 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/PMC3772710/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉McGuire, Amy L -- Joffe, Steven -- Koenig, Barbara A -- Biesecker, Barbara B -- McCullough, Laurence B -- Blumenthal-Barby, Jennifer S -- Caulfield, Timothy -- Terry, Sharon F -- Green, Robert C -- CA154517/CA/NCI NIH HHS/ -- HG003178/HG/NHGRI NIH HHS/ -- HG005092/HG/NHGRI NIH HHS/ -- HG006485/HG/NHGRI NIH HHS/ -- HG006492/HG/NHGRI NIH HHS/ -- HG006500/HG/NHGRI NIH HHS/ -- HG006612-02/HG/NHGRI NIH HHS/ -- HG006615/HG/NHGRI NIH HHS/ -- HG02213/HG/NHGRI NIH HHS/ -- P20 HG007243/HG/NHGRI NIH HHS/ -- R01 CA154517/CA/NCI NIH HHS/ -- R01 HG002213/HG/NHGRI NIH HHS/ -- R01 HG003178/HG/NHGRI NIH HHS/ -- R01 HG005092/HG/NHGRI NIH HHS/ -- R01-CA154517/CA/NCI NIH HHS/ -- U01 HG006485/HG/NHGRI NIH HHS/ -- U01 HG006492/HG/NHGRI NIH HHS/ -- U01 HG006500/HG/NHGRI NIH HHS/ -- Intramural NIH HHS/ -- New York, N.Y. -- Science. 2013 May 31;340(6136):1047-8. doi: 10.1126/science.1240156. Epub 2013 May 16.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Medical Ethics and Health Policy, Baylor College of Medicine, Houston, TX 77030, USA. amcguire@bcm.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23686340" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Child ; Disease/*genetics ; *Genetic Predisposition to Disease ; Genetic Testing/ethics/standards ; Genome-Wide Association Study/ethics/standards ; Genomics/*ethics/*standards ; Humans ; *Incidental Findings ; Laboratories/ethics/standards/statistics & numerical data ; Mutation/ethics ; Neoplasms/genetics ; *Practice Guidelines as Topic ; Sequence Analysis, DNA/ethics
    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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  • 6
    Publication Date: 2003-03-01
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bass, Gary D -- Blumenthal, Paul D -- Corfman, Phil -- Darney, Philip D -- Gonsalves, Gregg -- Levin, Arthur A -- Trussell, James -- Shields, Wayne C -- New York, N.Y. -- Science. 2003 Feb 28;299(5611):1313.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12610277" target="_blank"〉PubMed〈/a〉
    Keywords: Acquired Immunodeficiency Syndrome/prevention & control ; *Advisory Committees ; Federal Government ; Humans ; *Politics ; *Public Health ; *Science ; United States
    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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  • 7
    Publication Date: 2014-03-29
    Description: Regulated transcription controls the diversity, developmental pathways and spatial organization of the hundreds of cell types that make up a mammal. Using single-molecule cDNA sequencing, we mapped transcription start sites (TSSs) and their usage in human and mouse primary cells, cell lines and tissues to produce a comprehensive overview of mammalian gene expression across the human body. We find that few genes are truly 'housekeeping', whereas many mammalian promoters are composite entities composed of several closely separated TSSs, with independent cell-type-specific expression profiles. TSSs specific to different cell types evolve at different rates, whereas promoters of broadly expressed genes are the most conserved. Promoter-based expression analysis reveals key transcription factors defining cell states and links them to binding-site motifs. The functions of identified novel transcripts can be predicted by coexpression and sample ontology enrichment analyses. The functional annotation of the mammalian genome 5 (FANTOM5) project provides comprehensive expression profiles and functional annotation of mammalian cell-type-specific transcriptomes with wide applications in biomedical research.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4529748/" 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/PMC4529748/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉FANTOM Consortium and the RIKEN PMI and CLST (DGT) -- Forrest, Alistair R R -- Kawaji, Hideya -- Rehli, Michael -- Baillie, J Kenneth -- de Hoon, Michiel J L -- Haberle, Vanja -- Lassmann, Timo -- Kulakovskiy, Ivan V -- Lizio, Marina -- Itoh, Masayoshi -- Andersson, Robin -- Mungall, Christopher J -- Meehan, Terrence F -- Schmeier, Sebastian -- Bertin, Nicolas -- Jorgensen, Mette -- Dimont, Emmanuel -- Arner, Erik -- Schmidl, Christian -- Schaefer, Ulf -- Medvedeva, Yulia A -- Plessy, Charles -- Vitezic, Morana -- Severin, Jessica -- Semple, Colin A -- Ishizu, Yuri -- Young, Robert S -- Francescatto, Margherita -- Alam, Intikhab -- Albanese, Davide -- Altschuler, Gabriel M -- Arakawa, Takahiro -- Archer, John A C -- Arner, Peter -- Babina, Magda -- Rennie, Sarah -- Balwierz, Piotr J -- Beckhouse, Anthony G -- Pradhan-Bhatt, Swati -- Blake, Judith A -- Blumenthal, Antje -- Bodega, Beatrice -- Bonetti, Alessandro -- Briggs, James -- Brombacher, Frank -- Burroughs, A Maxwell -- Califano, Andrea -- Cannistraci, Carlo V -- Carbajo, Daniel -- Chen, Yun -- Chierici, Marco -- Ciani, Yari -- Clevers, Hans C -- Dalla, Emiliano -- Davis, Carrie A -- Detmar, Michael -- Diehl, Alexander D -- Dohi, Taeko -- Drablos, Finn -- Edge, Albert S B -- Edinger, Matthias -- Ekwall, Karl -- Endoh, Mitsuhiro -- Enomoto, Hideki -- Fagiolini, Michela -- Fairbairn, Lynsey -- Fang, Hai -- Farach-Carson, Mary C -- Faulkner, Geoffrey J -- Favorov, Alexander V -- Fisher, Malcolm E -- Frith, Martin C -- Fujita, Rie -- Fukuda, Shiro -- Furlanello, Cesare -- Furino, Masaaki -- Furusawa, Jun-ichi -- Geijtenbeek, Teunis B -- Gibson, Andrew P -- Gingeras, Thomas -- Goldowitz, Daniel -- Gough, Julian -- Guhl, Sven -- Guler, Reto -- Gustincich, Stefano -- Ha, Thomas J -- Hamaguchi, Masahide -- Hara, Mitsuko -- Harbers, Matthias -- Harshbarger, Jayson -- Hasegawa, Akira -- Hasegawa, Yuki -- Hashimoto, Takehiro -- Herlyn, Meenhard -- Hitchens, Kelly J -- Ho Sui, Shannan J -- Hofmann, Oliver M -- Hoof, Ilka -- Hori, Furni -- Huminiecki, Lukasz -- Iida, Kei -- Ikawa, Tomokatsu -- Jankovic, Boris R -- Jia, Hui -- Joshi, Anagha -- Jurman, Giuseppe -- Kaczkowski, Bogumil -- Kai, Chieko -- Kaida, Kaoru -- Kaiho, Ai -- Kajiyama, Kazuhiro -- Kanamori-Katayama, Mutsumi -- Kasianov, Artem S -- Kasukawa, Takeya -- Katayama, Shintaro -- Kato, Sachi -- Kawaguchi, Shuji -- Kawamoto, Hiroshi -- Kawamura, Yuki I -- Kawashima, Tsugumi -- Kempfle, Judith S -- Kenna, Tony J -- Kere, Juha -- Khachigian, Levon M -- Kitamura, Toshio -- Klinken, S Peter -- Knox, Alan J -- Kojima, Miki -- Kojima, Soichi -- Kondo, Naoto -- Koseki, Haruhiko -- Koyasu, Shigeo -- Krampitz, Sarah -- Kubosaki, Atsutaka -- Kwon, Andrew T -- Laros, Jeroen F J -- Lee, Weonju -- Lennartsson, Andreas -- Li, Kang -- Lilje, Berit -- Lipovich, Leonard -- Mackay-Sim, Alan -- Manabe, Ri-ichiroh -- Mar, Jessica C -- Marchand, Benoit -- Mathelier, Anthony -- Mejhert, Niklas -- Meynert, Alison -- Mizuno, Yosuke -- de Lima Morais, David A -- Morikawa, Hiromasa -- Morimoto, Mitsuru -- Moro, Kazuyo -- Motakis, Efthymios -- Motohashi, Hozumi -- Mummery, Christine L -- Murata, Mitsuyoshi -- Nagao-Sato, Sayaka -- Nakachi, Yutaka -- Nakahara, Fumio -- Nakamura, Toshiyuki -- Nakamura, Yukio -- Nakazato, Kenichi -- van Nimwegen, Erik -- Ninomiya, Noriko -- Nishiyori, Hiromi -- Noma, Shohei -- Noazaki, Tadasuke -- Ogishima, Soichi -- Ohkura, Naganari -- Ohimiya, Hiroko -- Ohno, Hiroshi -- Ohshima, Mitsuhiro -- Okada-Hatakeyama, Mariko -- Okazaki, Yasushi -- Orlando, Valerio -- Ovchinnikov, Dmitry A -- Pain, Arnab -- Passier, Robert -- Patrikakis, Margaret -- Persson, Helena -- Piazza, Silvano -- Prendergast, James G D -- Rackham, Owen J L -- Ramilowski, Jordan A -- Rashid, Mamoon -- Ravasi, Timothy -- Rizzu, Patrizia -- Roncador, Marco -- Roy, Sugata -- Rye, Morten B -- Saijyo, Eri -- Sajantila, Antti -- Saka, Akiko -- Sakaguchi, Shimon -- Sakai, Mizuho -- Sato, Hiroki -- Savvi, Suzana -- Saxena, Alka -- Schneider, Claudio -- Schultes, Erik A -- Schulze-Tanzil, Gundula G -- Schwegmann, Anita -- Sengstag, Thierry -- Sheng, Guojun -- Shimoji, Hisashi -- Shimoni, Yishai -- Shin, Jay W -- Simon, Christophe -- Sugiyama, Daisuke -- Sugiyama, Takaai -- Suzuki, Masanori -- Suzuki, Naoko -- Swoboda, Rolf K -- 't Hoen, Peter A C -- Tagami, Michihira -- Takahashi, Naoko -- Takai, Jun -- Tanaka, Hiroshi -- Tatsukawa, Hideki -- Tatum, Zuotian -- Thompson, Mark -- Toyodo, Hiroo -- Toyoda, Tetsuro -- Valen, Elvind -- van de Wetering, Marc -- van den Berg, Linda M -- Verado, Roberto -- Vijayan, Dipti -- Vorontsov, Ilya E -- Wasserman, Wyeth W -- Watanabe, Shoko -- Wells, Christine A -- Winteringham, Louise N -- Wolvetang, Ernst -- Wood, Emily J -- Yamaguchi, Yoko -- Yamamoto, Masayuki -- Yoneda, Misako -- Yonekura, Yohei -- Yoshida, Shigehiro -- Zabierowski, Susan E -- Zhang, Peter G -- Zhao, Xiaobei -- Zucchelli, Silvia -- Summers, Kim M -- Suzuki, Harukazu -- Daub, Carsten O -- Kawai, Jun -- Heutink, Peter -- Hide, Winston -- Freeman, Tom C -- Lenhard, Boris -- Bajic, Vladimir B -- Taylor, Martin S -- Makeev, Vsevolod J -- Sandelin, Albin -- Hume, David A -- Carninci, Piero -- Hayashizaki, Yoshihide -- BB/F003722/1/Biotechnology and Biological Sciences Research Council/United Kingdom -- BB/G022771/1/Biotechnology and Biological Sciences Research Council/United Kingdom -- BB/I001107/1/Biotechnology and Biological Sciences Research Council/United Kingdom -- MC_PC_U127597124/Medical Research Council/United Kingdom -- MC_UP_1102/1/Medical Research Council/United Kingdom -- R01 DE022969/DE/NIDCR NIH HHS/ -- R01 GM084875/GM/NIGMS NIH HHS/ -- England -- Nature. 2014 Mar 27;507(7493):462-70. doi: 10.1038/nature13182.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24670764" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Atlases as Topic ; Cell Line ; Cells, Cultured ; Cluster Analysis ; Conserved Sequence/genetics ; Gene Expression Regulation/genetics ; Gene Regulatory Networks/genetics ; Genes, Essential/genetics ; Genome/genetics ; Humans ; Mice ; *Molecular Sequence Annotation ; Open Reading Frames/genetics ; Organ Specificity ; Promoter Regions, Genetic/*genetics ; RNA, Messenger/analysis/genetics ; Transcription Factors/metabolism ; Transcription Initiation Site ; Transcription, Genetic/genetics ; Transcriptome/*genetics
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 36 (1984), S. 439-441 
    ISSN: 1432-0827
    Keywords: Osteomalacia ; Aluminum ; Hydroxyapatite ; Mineralization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1432-0827
    Keywords: Cadmium ; Bone mineral ; Hydroxyapatite ; Toxicity ; Osteopenia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract In order to understand the biological action of cadmium (Cd) in inducing bone pathologies, the effect of Cd on the formation, structure, and properties of hydroxyapatite (HA) in vitro was investigated using three biologically relevant test systems: (1) direct precipitation of HA with no precursor phase; (2) transformation of amorphous calcium phosphate (ACP) to crystalline HA; and (3) growth of HA seed crystals. Cd-containing HA was prepared by transforming ACP to HA in the presence of Cd at a pH of 10; Cd/Ca ratios of 0.05, 0.10, and 0.20 were obtained. Infrared and x-ray diffraction analyses were performed on the Cd-HA samples, and measurements were made of Cd adsorption on HA and of the dissolution characteristics of Cd-containing HA. Cd incorporation in HA introduced little strain in the lattice but resulted in a decreasing C-axis spacing and a corresponding crystal size decrease in the C-axis direction. Cd incorporation had a nominal effect on HA dissolution. Cd had an inhibitory effect on HA formation kinetics in all three test systems. Infrared spectroscopy of Cd-HA showed a complex series of small changes in the spectra as a function of Cd concentration resulting from some distortion in the crystal perfection and symmetry. The interference of Cd with mineralization can be partially explained by its inhibitory effect on HA nucleation and growth in addition to any cellular involvement. Furthermore, Cd probably has little effect on bone mineral dissolution. Our results explain the Cd incorporation reported in bone.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 27 (1979), S. 75-82 
    ISSN: 1432-0827
    Keywords: Proteoglycans ; Hydroxyapatite ; Amorphous calcium phosphate ; Nucleation ; Calcification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary Well-characterized bovine nasal proteoglycan A1 fraction (aggregate) and proteoglycan D1 fraction (subunit) have been shown to be effective inhibitors of hydroxyapatite (HA) formation in two in vitro test systems: (a) the transformation of amorphous calcium phosphate (ACP) to crystalline HA, and, (b) the direct precipitation of HA from low-concentration calcium phosphate solutions. A1 or D1 in solution slowed the transformation kinetics in system (a) without affecting the time to the onset of conversion. In system (b), A1 or D1 in solution increased the time to the onset of HA formation without affecting the HA formation kinetics. In both test systems A1 was a more effective inhibitor than D1, although the difference was not great. In both systems the inhibitory effect was proportional to the A1 or D1 solution concentration. The action of solutions of low and high molecular weight neutral dextrans on both test systems showed that high molecular weight and/or extended spatial molecular conformation has a much stronger correlation with inhibitory ability than solution viscosity. Proteoglycans have been implicated as playing a role in regulating biological mineralization particularly in the epiphyseal growth plate. Our study suggests that just enzymatic cleavage of aggregate into subunit is not sufficient to allow mineralization to occur, since we find that D1 itself is a potent inhibitor of HA formation. Further degradation and/or removal of D1 appears to be necessary for calcification to take place.
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