Abstract:
:Acylated aldose dialkyl dithioacetals with bromine undergo replacement of one alkylthio group by bromine. These unstable bromides react, as by fusion with 2,4-bis(trimethylsilyloxy)pyrimidine, to give acylated 1-(pyrimidin-1-yl) derivatives that upon saponification afford acyclic sugar nucleoside analogues, some as separable mixtures of 1-epimers. Systemic stereochemical variants have been conducted. Pmr conformational studies show that the sugar chain is extended in certain examples, whereas others favor folded ("sickle") conformations, in line with a general rationale developed for acyclic-sugar derivatives. Condensation of the bromides with purines gives 9-substituted acyclic-sugar nucleoside analogues; synthesized systematically for various series, these include the D-pentoses in combination with 6-mercaptopurine. In vitro and in vivo biological activities vary according to stereochemistry of the sugar. The position of substitution of the sugar chain, the chirality at C-1', and the tautomeric form of the heterocycle, were established by x-ray crystallography of the product from D-arabinose and 6-mercaptopurine. The x-ray data permit correlation of C-1 chirality throughout the series and pmr data indicate the favored conformations.
journal_name
Ann N Y Acad Scijournal_title
Annals of the New York Academy of Sciencesauthors
Horton D,Baker DC,Kokrady SSdoi
10.1111/j.1749-6632.1975.tb29219.xsubject
Has Abstractpub_date
1975-08-08 00:00:00pages
131-50eissn
0077-8923issn
1749-6632journal_volume
255pub_type
杂志文章abstract::The human ABO(H) blood group phenotypes arise from the evolutionarily oldest genetic system found in primate populations. While the blood group antigen A is considered the ancestral primordial structure, under the selective pressure of life-threatening diseases blood group O(H) came to dominate as the most frequently ...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章,评审
doi:10.1111/nyas.13694
更新日期:2018-08-01 00:00:00
abstract::The results of four randomized controlled trials were examined to assess the efficacy of intravenous immunoglobulin (IVIG) for myasthenia gravis (MG) acute exacerbations. The first trial compared plasma exchange (PE) and IVIG in 87 patients. At day 15, the mean change in the Myasthenic Muscular Score (MMS) was 16.6 (9...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章,meta分析
doi:10.1196/annals.1405.001
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abstract::The rostral nucleus of the solitary tract (rNST) plays a key role in modulating, organizing and distributing the sensory information arriving at the central nervous system from gustatory receptors. However, except for some anatomical studies of rNST synapses, the neural circuits responsible for this first stage in syn...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章,评审
doi:10.1111/j.1749-6632.1998.tb10607.x
更新日期:1998-11-30 00:00:00
abstract::Nipah virus (NiV) is a highly pathogenic paramyxovirus, which emerged in 1998 from fruit bats in Malaysia and caused an outbreak of severe respiratory disease in pigs and fatal encephalitis in humans with high mortality rates. In contrast to most paramyxoviruses, NiV can infect a large variety of mammalian species. Du...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章,评审
doi:10.1196/annals.1408.003
更新日期:2007-04-01 00:00:00
abstract::The observations described herein allow us to make several inferences about PKC and regulation of normal and CF Cl- channels. FIGURE 5 shows a model that summarizes these observations. In this model, for the sake of clarity, we refer to the channel as a single entity, but note that it may consist of multiple subunits ...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章
doi:10.1111/j.1749-6632.1989.tb25131.x
更新日期:1989-01-01 00:00:00
abstract::Pituitary adenylate cyclase-activating polypeptide (PACAP), vasoactive intestinal peptide (VIP), and peptide histidine-isoleucine (PHI) are members of a superfamily of structurally related peptides widely distributed in the body and displaying pleiotropic biological activities. All these peptides are known to act via ...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章
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更新日期:2006-07-01 00:00:00
abstract::5-Lipoxygenase (5-LOX) and cyclooxygenase-2 (COX-2) are two enzymes that are critical for the synthesis of eicosanoids, the inflammatory metabolites of arachidonic acid. Both 5-LOX and COX-2 are expressed in the brain, including in CNS neurons. The physiologic role of these proteins in neuronal functioning is not clea...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章
doi:10.1111/j.1749-6632.2001.tb03610.x
更新日期:2001-06-01 00:00:00
abstract::Mammalian spermatogenesis is a complex developmental process. Spermatozoa, like ova, are uniquely capable of supporting embryonic development. Our approach to understanding this process is to identify genes whose developmental pattern of expression suggests that they may play a role in spermatogenesis. Experiments on ...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章
doi:10.1111/j.1749-6632.1987.tb25002.x
更新日期:1987-01-01 00:00:00
abstract::The accepted dogma has been that a single long-term hematopoietic stem cell (LT-HSC) can reconstitute all components of the immune system. However, our single-cell transfer studies have shown that highly purified LT-HSCs selectively fail to reconstitute B-1a cells in otherwise fully reconstituted hosts (i.e., LT-HSCs ...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章,评审
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abstract::A short review of current concepts concerning the origin and kinetics of monocytes and macrophages is given, and the humoral regulation of monocyte production by FIM, a factor synthesized and secreted by macrophages, is discussed. Genetic control of the responsiveness of monocyte precursors to FIM and that of the phag...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章,评审
doi:10.1111/j.1749-6632.1986.tb18476.x
更新日期:1986-01-01 00:00:00
abstract::How can a psychoanalyst account for and recount the process of understanding the therapeutic endeavor? What happens in those moments, co-created by patient and analyst, when the consultation room comes "alive" in ways that defy easy or simplistic answers? How does an analyst come to understand psychoanalytic treatment...
journal_title:Annals of the New York Academy of Sciences
pub_type: 传,历史文章,杂志文章
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更新日期:2009-04-01 00:00:00
abstract::Questions about music's evolution and functions have long excited interest among scholars. More recent theoretical accounts have stressed the importance of music's social origins and functions. Autism and Williams syndrome, neurodevelopmental disorders supposedly characterized by contrasting social and musical phenoty...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章,评审
doi:10.1111/j.1749-6632.2009.04583.x
更新日期:2009-07-01 00:00:00
abstract::A well-controlled local immune response is needed for recovery from CNS injury, and autoimmune T cells play a key role in mediating this response. Autoimmunity, at least in the context of the CNS, is the body's fighting force against self-derived destructive compounds, and "tolerance to self" (traditionally though mis...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章,评审
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更新日期:2005-06-01 00:00:00
abstract::It has previously been shown that stimulation of muscarinic m1 or m3 receptors can, by generating diacylglycerol (DAG) and activating protein kinase C (PKC), accelerate the breakdown of the amyloid precursor protein (APP) to form soluble, non-amyloidogenic peptides (APPs). This relationship has been demonstrated in hu...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章
doi:10.1111/j.1749-6632.1996.tb34443.x
更新日期:1996-01-17 00:00:00
abstract::Successful introduction of nucleic acids into mammalian neurons has revolutionized the analyses of gene regulation and cellular function. Various methods, including viral infection, have been developed to introduce plasmid DNA into primary neuronal cultures. However, transfection of primary cultures of neurons using t...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章
doi:10.1111/j.1749-6632.2003.tb07516.x
更新日期:2003-05-01 00:00:00
abstract::The harmful effects of oxidative processes in living organisms, in addition to chemical and biochemical media, can be reduced by antioxidants. The efficacy of an antioxidant depends on its reduction potential and kinetics of elimination of diverse free radicals. Redox potentials and reaction rate constants of selected...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章,评审
doi:10.1111/j.1749-6632.2000.tb06197.x
更新日期:2000-01-01 00:00:00
abstract::The LGR7/RXFP1 and LGR8/RXFP2 receptors are unique receptors among the G-protein-coupled receptors (GPCRs) in having a low-density lipoprotein class A (LDL-A) module. Their complex gene organization, among the intron-richest of the GPCRs, suggests that alternative splicing is a common occurrence. We have therefore inv...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章
doi:10.1111/j.1749-6632.2008.03826.x
更新日期:2009-04-01 00:00:00
abstract::Ankylosing spondylitis (AS) is a chronic inflammatory condition associated with HLA B27. But the association is not absolute. Hence association with other HLA class I antigens and class II alleles was studied in a southern Indian population. Sixty-five patients with primary AS were typed serologically for HLA class I ...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章
doi:10.1111/j.1749-6632.2002.tb03013.x
更新日期:2002-04-01 00:00:00
abstract::Population trends indicate that in the near future the size of the elderly population will increase. This will result in a large increment in the numbers of persons suffering mild to severe levels of cognitive impairment. While considerable efforts continue to be made to explain brain changes associated with Alzheimer...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章
doi:10.1111/j.1749-6632.1996.tb34395.x
更新日期:1996-01-17 00:00:00
abstract::This study describes the features of the marginal zone (MZ) B cells of human tonsils and spleens and compares them with those of the follicular mantle (FM) B cells from the same tissues. The two B cell subpopulations displayed marked differences in phenotype, in response capacity to T cell-independent antigens and pol...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章,评审
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更新日期:2003-04-01 00:00:00
abstract::In order to analyze neuronal computations in the first olfactory processing center, the olfactory bulb, we measured odor-evoked activity patterns across large numbers of neurons within the intact olfactory bulb of zebrafish using optical and electrophysiological methods. We found that the olfactory bulb performs multi...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章
doi:10.1111/j.1749-6632.2009.04010.x
更新日期:2009-07-01 00:00:00
abstract::Autophagy is a phylogenetically conserved process that plays a critical role in the degradation of oxidatively damaged proteins and organelle turnover. The role of oxidative stress and apoptosis in methamphetamine (METH)-induced neurotoxicity is well known; however, the potential contribution of autophagy to METH-indu...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章
doi:10.1196/annals.1369.022
更新日期:2006-08-01 00:00:00
abstract::Combinations of midazolam, allopregnanolone, and perampanel were assessed for antiseizure activity in a rat diisopropylfluorophosphate (DFP) status epilepticus model. Animals receiving DFP followed by atropine and pralidoxime exhibited continuous high-amplitude rhythmical electroencephalography (EEG) spike activity an...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章
doi:10.1111/nyas.14479
更新日期:2020-11-01 00:00:00
abstract::TGF beta is a cytokine which is involved with the regulation of different aspects of host defense responses to injury. Overexpression of TGF beta can lead to the conversion of its protective functions to pathogenetic manifestations. TGF beta is a potent factor in promoting anabolic aspects in connective tissue metabol...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章,评审
doi:10.1111/j.1749-6632.1993.tb35912.x
更新日期:1993-06-23 00:00:00
abstract::Within the past few years, developmental scientists have switched their attention from the study of DNA sequencing to the epigenetic state of the genome. Studying epigenetics could present the key to understanding gene expression changes without altering the basic structure of DNA. For example, the blastocyst, trophec...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章
doi:10.1111/j.1749-6632.2010.05937.x
更新日期:2011-03-01 00:00:00
abstract::During the past decade, a considerable body of evidence has emerged showing that circumstances during the fetal period may have lifelong programming effects on different body functions with a considerable impact on disease susceptibility. The purpose of this article is to provide a synopsis of these findings and their...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章,评审
doi:10.1196/annals.1367.026
更新日期:2006-11-01 00:00:00
abstract::The current trend in antipoverty policy emphasizes mandated empowerment: the poor are being handed the responsibility for making things better for themselves, largely without being asked whether this is what they want. Beneficiary control is now being built into public service delivery, while microcredit and small bus...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章
doi:10.1196/annals.1425.019
更新日期:2008-01-01 00:00:00
abstract::Rheumatoid arthritis (RA) is associated with accelerated atherosclerosis. Fractalkine, a CX3C/chemokine (CX3CL1), mediates monocytes-macrophage infiltration in activated endothelium, suggesting its specific role in atherosclerosis-related inflammation. In this study, we evaluate the following in early RA patients: the...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章
doi:10.1196/annals.1381.004
更新日期:2007-06-01 00:00:00
abstract::This study examined the functional response to human relaxin 2 (H2 relaxin), human relaxin 3 (H3 relaxin), porcine relaxin, and human INSL3 in the cytosensor microphysiometer, using CHO-K1 cells stably expressing human GPCR135. CHO-K1 cells stably expressing GPCR135 were generated by the serial dilution method and rec...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章
doi:10.1196/annals.1282.053
更新日期:2005-05-01 00:00:00
abstract::Based on the relation found to exist between low CSF 5-HIAA and suicide attempt, in particular violent suicide attempt, both in depressed and in so-called nondepressed suicide attempters, the conclusion was drawn that decreased central 5-HT metabolism is related to (auto)aggression, rather than to depression. We chall...
journal_title:Annals of the New York Academy of Sciences
pub_type: 杂志文章
doi:10.1111/j.1749-6632.1986.tb27895.x
更新日期:1986-01-01 00:00:00