bluuebunny/crossref_metadata_2025_split huggingface dataset:
Rutin Inhibits Ovariectomy-Induced Osteopenia in Rats
Authors: Horcajada-Molteni Marie-Noëlle , Crespy Vanessa , Coxam Véronique , Davicco Marie-Jeanne , Rémésy Christian , Barlet Jean-Pierre 
Published: April 2006

Abstract
Several studies suggest that polyphenols might exert a protective effect against osteopenia. The present experiment was conducted to observe the effects of rutin (quercetin-3-O-glucose rhamnose) on bone metabolism in ovariectomized (OVX) rats. Thirty 3-month-old Wistar rats were used. Twenty were OVX while the 10 controls were sham-operated (SH). Among the 20 OVX, for 90 days after surgery 10 were fed the same synthetic diet as the SH or OVX ones, but 0. 25% rutin (OVX + R) was added. At necropsy, the decrease in uterine weight was not different in OVX and OVX + R rats. Ovariectomy also induced a significant decrease in both total and distal metaphyseal femoral mineral density, which was prevented by rutin consumption. Moreover, femoral failure load, which was not different in OVX and SH rats, was even higher in OVX + R rats than in OVX or SH rats. In the same way, on day 90, both urinary deoxypyridinoline (DPD) excretion (a marker for bone resorption) and calciuria were higher in OVX rats than in OVX + R or SH rats. Simultaneously, plasma osteocalcin (OC) concentration (a marker for osteoblastic activity) was higher in OVX + R rats than in SH rats. High-performance liquid chromatography (HPLC) profiles of plasma samples from OVX + R rats revealed that mean plasma concentration of active metabolites (quercetin and isorhamnetin) from rutin was 9.46 + 1 μM, whereas it was undetectable in SH and OVX rats. These results indicate that rutin (and/or its metabolites), which appeared devoid of any uterotrophic activity, inhibits ovariectomy-induced trabecular bone loss in rats, both by slowing down resorption and increasing osteoblastic activity.
On Exposure to Anorexia Nervosa, the Temporal Variation in Axial and Appendicular Skeletal Development Predisposes to Site-Specific Deficits in Bone Size and Density: A Cross-Sectional Study
Authors: Seeman Ego , Karlsson Magnus K. , Duan Yunbo 
Published: April 2006

Abstract
Skeletal development is heterogeneous. Throughout growth, bone size is more maturationally advanced than the mineral being accrued within its periosteal envelope; before puberty, appendicular growth is more rapid than axial growth; during puberty, appendicular growth slows and axial growth accelerates. We studied women with differing age of onset of anorexia nervosa to determine whether this temporal heterogeneity in growth predisposed to the development of deficits in bone size and volumetric bone mineral density (vBMD), which varied by site and severity depending on the age at which anorexia nervosa occurred. Bone size and vBMD of the third lumbar vertebra and femoral neck were measured using dual-energy X-ray absorptiometry in 210 women aged 21 years (range, 12–40 years) with anorexia nervosa. Results were expressed as age-specific SDs (mean ± SEM). Bone width depended on the age of onset of anorexia nervosa; when the onset of anorexia nervosa occurred (1) before 15 years of age, deficits in vertebral body and femoral neck width did not differ (−0.77 ± 0.27 SD and −0.55 ± 0.17 SD, respectively); (2) between 15 and 19 years of age, deficits in vertebral body width (−0.95 ± 0.16 SD) were three times the deficits in femoral neck width (−0.28 ± 0.14 SD; p &lt; 0.05 comparing the deficits), (3) after 19 years of age, deficits in the vertebral body width (−0.49 ± 0.26 SD; p = 0.05) were half that in women with earlier onset of anorexia nervosa. No deficit in bone width was observed at the femoral neck. Deficits in vBMD at the vertebra and femoral neck were independent of the age of onset of anorexia nervosa but increased as the duration of anorexia nervosa increased, being about 0.5 SD lower at the vertebra than femoral neck. We infer that the maturational development of a region at the time of exposure to disease, and disease duration, determine the site, magnitude, and type of trait deficit in anorexia nervosa. Bone fragility due to reduced bone size and reduced vBMD in adulthood is partly established during growth.
Genetic Contribution to Bone Metabolism, Calcium Excretion, and Vitamin D and Parathyroid Hormone Regulation
Authors: Hunter D. , De Lange M. , Snieder H. , MacGregor A. J. , Swaminathan R. , Thakker R. V. , Spector T. D. 
Published: April 2006

Abstract
A classical twin study was performed to assess the relative contribution of genetic and environmental factors to bone metabolism, calcium homeostasis, and the hormones regulating them. It was examined further whether the genetic effect is menopause dependent. The subjects were 2136 adult twins (98.3% female): 384 monozygotic (MZ) and 684 dizygotic (DZ) twin pairs. The intraclass correlations were calculated, and maximum likelihood model fitting was used to estimate genetic and environmental variance components. The intraclass correlations for all of the variables assessed were higher in MZ twin pairs. The heritabilities (95% CIs) obtained from model fitting for hormones regulating bone metabolism and calcium homeostasis were parathyroid hormone (PTH), 60% (54–65%); 25-hydroxyvitamin D [25(OH)D]; 43% (28–57%), 1,25-hydroxyvitamin D [1,25(OH)], 65% (53–74%); and vitamin D binding protein 62% (56–66%). The heritabilities (95% CIs) for markers of bone formation also were assessed; bone-specific alkaline phosphatase (BSAP), 74% (67–80%), and osteocalcin, 29% (14–44%); marker of bone resorption deoxypyridinoline (DPD), 58% (52–64%); and measure of calcium homeostasis 24 h urine calcium, creatinine (Cr), 52% (41–61%). The magnitude of genetic influence differed with menopause for most variables. This study provides evidence for the importance of genetic factors in determining bone resorption and formation, calcium excretion, and the hormones regulating these processes. It shows for the first time a clear genetic effect on bone resorption in premenopausal women and the regulation of PTH, vitamin D metabolism, and calcium excretion. The genes controlling bone hormones and markers are likely to be useful therapeutic and diagnostic targets.
Exposure of KS483 Cells to Estrogen Enhances Osteogenesis and Inhibits Adipogenesis
Authors: Dang Z. C. , Van Bezooijen R. L. , Karperien M. , Papapoulos S. E. , Löwik C. W. G. M. 
Published: April 2006

Abstract
Osteoblasts and adipocytes arise from a common progenitor cell in bone marrow. Whether estrogen directly regulates the progenitor cells differentiating into osteoblasts or adipocytes remains unknown. Using a mouse clonal cell line KS483 cultured in charcoal-stripped fetal bovine serum (FBS), we showed that 17β-estradiol (E2) stimulates the differentiation of progenitor cells into osteoblasts and concurrently inhibits adipocyte formation in an estrogen receptor (ER)-dependent way. E2 increased alkaline phosphate (ALP) activity and nodule formation and stimulated messenger RNA (mRNA) expression of core-binding factor α-1 (Cbfa1), parathyroid hormone/parathyroid hormone-related protein receptors (PTH/PTHrP-Rs), and osteocalcin. In contrast, E2 decreased adipocyte numbers and down-regulated mRNA expression of peroxisome proliferator-activated receptor-γ (PPARγ)2, adipocyte protein 2 (aP2), and lipoprotein lipase (LPL). Furthermore, the reciprocal control of osteoblast and adipocyte differentiation by E2 was observed also in the presence of the adipogenic mixture of isobutylmethylxanthine, dexamethasone, and insulin. Immunohistochemical staining showed that ERα and ERβ were present in osteoblasts and adipocytes. A new mouse splice variant ERβ2 was identified, which differed in two amino acid residues from the rat isoform. E2 down-regulated mRNA expression of ERα, ERβ1, and ERβ2. The effects of E2 are not restricted to the KS483 cell line because similar results were obtained in mouse bone marrow cell cultures. Our results indicate that estrogen, in addition to stimulation of osteogenesis, inhibits adipogenesis, which might explain the clinical observations that estrogen-deficiency leads to an increase in adipocytes.
Centromere Locations and Associated Chromosome Rearrangements in Arabidopsis lyrata and A. thaliana
Authors: Kawabe Akira , Hansson Bengt , Hagenblad Jenny , Forrest Alan , Charlesworth Deborah 
Published: April 2006

Abstract
We analyzed linkage and chromosomal positions of genes in A. lyrata ssp. petraea that are located near the centromere (CEN) regions of A. thaliana, using at least two genes from the short and long arms of each chromosome. In our map, genes from all 10 A. thaliana chromosome arms are also tightly linked in A. lyrata. Genes from the regions on the two sides of CEN5 have distant map localizations in A. lyrata (genes on the A. thaliana short-arm genes are on linkage group AL6, and long-arm genes are on AL7), but genes from the other four A. thaliana centromere regions remain closely linked in A. lyrata. The observation of complete linkage between short- and long-arm centromere genes, but not between genes in other genome regions that are separated by similar physical distances, suggests that crossing-over frequencies near the A. lyrata ssp. petraea centromere regions are low, as in A. thaliana. Thus, the centromere positions appear to be conserved between A. thaliana and A. lyrata, even though three centromeres have been lost in A. thaliana, and the core satellite sequences in the two species are very different. We can now definitively identify the three centromeres that were eliminated in the fusions that formed the A. thaliana chromosomes. However, we cannot tell whether genes were lost along with these centromeres, because such genes are absent from the A. thaliana genome, which is the sole source of markers for our mapping.
Unusual DNA Structures Associated With Germline Genetic Activity in Caenorhabditis elegans
Authors: Fire Andrew , Alcazar Rosa , Tan Frederick 
Published: April 2006

Abstract
We describe a surprising long-range periodicity that underlies a substantial fraction of C. elegans genomic sequence. Extended segments (up to several hundred nucleotides) of the C. elegans genome show a strong bias toward occurrence of AA/TT dinucleotides along one face of the helix while little or no such constraint is evident on the opposite helical face. Segments with this characteristic periodicity are highly overrepresented in intron sequences and are associated with a large fraction of genes with known germline expression in C. elegans. In addition to altering the path and flexibility of DNA in vitro, sequences of this character have been shown by others to constrain DNA∷nucleosome interactions, potentially producing a structure that could resist the assembly of highly ordered (phased) nucleosome arrays that have been proposed as a precursor to heterochromatin. We propose a number of ways that the periodic occurrence of An/Tn clusters could reflect evolution and function of genes that express in the germ cell lineage of C. elegans.
A Genetic Suppressor of Two Dominant Temperature-Sensitive Lethal Proteasome Mutants of Drosophila melanogaster Is Itself a Mutated Proteasome Subunit Gene
Authors: Neuburger Peter J , Saville Kenneth J , Zeng Jue , Smyth Kerrie-Ann , Belote John M 
Published: April 2006

Abstract
Two dominant temperature-sensitive (DTS) lethal mutants of Drosophila melanogaster are Pros261 and Prosβ21, previously known as DTS5 and DTS7. Heterozygotes for either mutant die as pupae when raised at 29°, but are normally viable and fertile at 25°. Previous studies have identified these as missense mutations in the genes encoding the β6 and β2 subunits of the 20S proteasome, respectively. In an effort to isolate additional proteasome-related mutants a screen for dominant suppressors of Pros261 was carried out, resulting in the identification of Pros25SuDTS [originally called Su(DTS)], a missense mutation in the gene encoding the 20S proteasome α2 subunit. Pros25SuDTS acts in a dominant manner to rescue both Pros261 and Prosβ21 from their DTS lethal phenotypes. Using an in vivo protein degradation assay it was shown that this suppression occurs by counteracting the dominant-negative effect of the DTS mutant on proteasome activity. Pros25SuDTS is a recessive polyphasic lethal at ambient temperatures. The effects of these mutants on larval neuroblast mitosis were also examined. While Prosβ21 shows a modest increase in the number of defective mitotic figures, there were no defects seen with the other two mutants, other than slightly reduced mitotic indexes.
The Saccharomyces cerevisiae 14-3-3 Proteins Are Required for the G1/S Transition, Actin Cytoskeleton Organization and Cell Wall Integrity
Authors: Lottersberger Francisca , Panza Andrea , Lucchini Giovanna , Piatti Simonetta , Longhese Maria Pia 
Published: April 2006

Abstract
14-3-3 proteins are highly conserved polypeptides that participate in many biological processes by binding phosphorylated target proteins. The Saccharomyces cerevisiae BMH1 and BMH2 genes, whose concomitant deletion is lethal, encode two functionally redundant 14-3-3 isoforms. To gain insights into the essential function(s) shared by these proteins, we searched for high-dosage suppressors of the growth defects of temperature-sensitive bmh mutants. Both the protein kinase C1 (Pkc1) and its upstream regulators Wsc2 and Mid2 were found to act as high dosage suppressors of bmh mutants' temperature sensitivity, indicating a functional interaction between 14-3-3 and Pkc1. Consistent with a role of 14-3-3 proteins in Pkc1-dependent cellular processes, shift to the restrictive temperature of bmh mutants severely impaired initiation of DNA replication, polarization of the actin cytoskeleton, and budding, as well as cell wall integrity. Because Pkc1 acts in concert with the Swi4-Swi6 (SBF) transcriptional activator to control all these processes, the defective G1/S transition of bmh mutants might be linked to impaired SBF activity. Indeed, the levels of the G1 cyclin CLN2 transcripts, which are positively regulated by SBF, were dramatically reduced in bmh mutants. Remarkably, budding and DNA replication defects of bmh mutants were suppressed by CLN2 expression from an SBF-independent promoter, suggesting that 14-3-3 proteins might contribute to regulating the late G1 transcriptional program.
Ribosomal RNA Gene Silencing in Interpopulation Hybrids of Tigriopus californicus: Nucleolar Dominance in the Absence of Intergenic Spacer Subrepeats
Authors: Flowers Jonathan M , Burton Ronald S 
Published: April 2006

Abstract
A common feature of interspecific animal and plant hybrids is the uniparental silencing of ribosomal RNA gene transcription, or nucleolar dominance. A leading explanation for the genetic basis of nucleolar dominance in animal hybrids is the enhancer-imbalance model. The model proposes that limiting transcription factors are titrated by a greater number of enhancer-bearing subrepeat elements in the intergenic spacer (IGS) of the dominant cluster of genes. The importance of subrepeats for nucleolar dominance has repeatedly been supported in competition assays between Xenopus laevis and X. borealis minigene constructs injected into oocytes. However, a more general test of the importance of IGS subrepeats for nuclear dominance in vivo has not been conducted. In this report, rRNA gene expression was examined in interpopulation hybrids of the marine copepod Tigriopus californicus. This species offers a rare opportunity to test the role of IGS subrepeats in nucleolar dominance because the internal subrepeat structure, found in the IGS of virtually all animal and plant species, is absent in T. californicus. Our results clearly establish that nucleolar dominance occurs in F1 and F2 interpopulation hybrids of this species. In the F2 generation, nucleolar dominance appears to break down in some hybrids in a fashion that is inconsistent with a transcription factor titration model. These results are significant because they indicate that nucleolar dominance can be established and maintained without enhancer-bearing repeat elements in the IGS. This challenges the generality of the enhancer-imbalance model for nucleolar dominance and suggests that dominance of rRNA transcription in animals may be determined by epigenetic factors as has been established in plants.
Divergence With Gene Flow in Anopheles funestus From the Sudan Savanna of Burkina Faso, West Africa
Authors: Michel Andrew P , Grushko Olga , Guelbeogo Wamdaogo M , Lobo Neil F , Sagnon N'Fale , Costantini Carlo , Besansky Nora J 
Published: April 2006

Abstract
Anopheles funestus is a major vector of malaria across Africa. Understanding its complex and nonequilibrium population genetic structure is an important challenge that must be overcome before vector populations can be successfully perturbed for malaria control. Here we examine the role of chromosomal inversions in structuring genetic variation and facilitating divergence in Burkina Faso, West Africa, where two incipient species (chromosomal forms) of A. funestus, defined principally by rearrangements of chromosome 3R, have been hypothesized. Sampling across an ∼300-km east–west transect largely contained within the Sudan–Savanna ecoclimatic zone, we analyzed chromosomal inversions, 16 microsatellite loci distributed genomewide, and 834 bp of the mtDNA ND5 gene. Both molecular markers revealed high genetic diversity, nearly all of which was accounted for by within-population differences among individuals, owing to recent population expansion. Across the study area there was no correlation between genetic and geographic distance. Significant genetic differentiation found between chromosomal forms on the basis of microsatellites was not genomewide but could be explained by chromosome 3R alone on the basis of loci inside and near inversions. These data are not compatible with complete reproductive isolation but are consistent with differential introgression and sympatric divergence between the chromosomal forms, facilitated by chromosome 3R inversions.
Familial thoracic aortic aneurysms and dissections: Three families with early‐onset ascending and descending aortic dissections in women
Authors: Tran‐Fadulu Van , Chen Julia H. , Lemuth Danielle , Neichoy Bo T. , Yuan Jiuhong , Gomes Nathan , Sparks Elizabeth , Kramer Larry A. , Guo Dongchuan , Pannu Hariyadarshi , Braverman Alan C. , Shete Sanjay , Milewicz Dianna M. 
Published: April 2006

AbstractAscending thoracic aortic aneurysms leading to type A dissections can be inherited in an autosomal dominant manner with variable age of onset and decreased penetrance, primarily in women. Three families are described with autosomal dominant inheritance of either ascending aortic aneurysms leading to type A dissections or type B dissections, and a young age of onset of aortic dissections in both men and women. Pedigree analysis suggests that a de novo mutation is responsible for the disease in one family. The discordant age of onset of aortic disease in a monozygotic twin pair in a different family indicates that environmental or stochastic factors may influence the variable expression of disease. Genetic analysis of one family excluded linkage to known loci for TAAD (TAAD1, TAAD2, FAA1, or FBN1) and sequence analysis failed to identify mutations in TGFBR2, the gene encoding transforming growth factor beta receptor type II. Thus, a novel unidentified loci may be responsible for the phenotype in these three families. © 2006 Wiley‐Liss, Inc.
Formkontrolle von Halbleiter‐ und Metalloxid‐Nanokristallen durch nichthydrolytische Kolloidverfahren
Authors: Jun Young‐wook , Choi Jin‐sil , Cheon Jinwoo 
Published: April 2006

AbstractAnorganische Nanokristalle mit gezielt präparierten Formen und Abmessungen haben einzigartige, formabhängige Eigenschaften und sind als Bausteine zur Herstellung von Nanofunktionseinheiten von großem Interesse. In diesem Aufsatz fassen wir die jüngsten Entwicklungen bei der Formkontrolle von kolloidalen Nanokristallen zusammen, wobei der Schwerpunkt auf den wissenschaftlich und technologisch wichtigen Halbleiter‐ und Metalloxid‐Nanokristallen liegt, die sich durch nichthydrolytische Synthesemethoden erhalten lassen. Viele ungewöhnliche Strukturmotive wurden entdeckt, darunter Polyeder, Stäbchen und Drähte, Scheiben und Prismen sowie komplexere Formen wie verzweigte Stäbchen, Sterne, anorganische Dendrimere und Hanteln. Der gegenwärtig favorisierte Mechanismus der Formkontrolle wird vorgestellt, ebenso wie richtungsweisende Studien zur Anordnung formkontrollierter Nanokristalle zu geordneten Übergittern und zur Herstellung hochentwickelter Prototypen von Nanofunktionseinheiten.
Shape Control of Semiconductor and Metal Oxide Nanocrystals through Nonhydrolytic Colloidal Routes
Authors: Jun Young‐wook , Choi Jin‐sil , Cheon Jinwoo 
Published: April 2006

AbstractInorganic nanocrystals with tailored geometries exhibit unique shape‐dependent phenomena and subsequent utilization of them as building blocks for the fabrication of nanodevices is of significant interest. Herein, we review the recent developments in the shape control of colloidal nanocrystals with a focus on the scientifically and technologically important semiconductor and metal oxide nanocrystals obtained by nonhydrolytic synthetic methods. Many structurally unprecedented motifs have been discovered including polyhedrons, rods and wires, plates and prisms, and other advanced shapes such as branched rods, stars, inorganic dendrites, and dumbbells. The currently proposed shape‐guiding mechanisms are presented and the important pioneering studies on the assembly of shape‐controlled nanocrystals into ordered superlattices and the fabrication of prototype advanced nanodevices are discussed.
Study on morphology of high impact polypropylene prepared by in situ blending
Authors: Jiang Tao , Chen Hongxia , Ning Yingnan , Kuang Dongting , Qu Guangmiao 
Published: April 2006

AbstractHigh impact polypropylene (HIPP) was prepared by in situ blending of isotactic polypropylene and ethylene–propylene rubber (EPR) with spherical Ziegler–Natta catalyst. Morphology and pore characteristics of such HIPP were investigated by scanning electron microscope, atomic force microscopy, and mercury intrusion. Amorphous phase was removed from polypropylene matrix and characterized by 13C NMR spectrum. It was found that the EPR prepared in this manner contained variable composition polymer chains with a distribution of ethylene and propylene sequence lengths. Final products of HIPP were free flowing, spherical granules. There were small pores in HIPP, which seemed not to be filled up, and could be determined by mercury intrusion even when the content of rubber was up to 24 wt %. Homopolypropylene with pore diameter between 100 and 10,000 nm was suitable for EPR to fill in during ethylene–propylene copolymerization. The block copolymer fractions act as a compatilizer between matrix and EPR. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 1386–1390, 2006
Competitive transport of hydrochloric acid and zinc chloride through polymeric anion‐exchange membrane
Authors: Palatý Zdeněk , Žáková Alena 
Published: April 2006

AbstractCompetitive transport of hydrochloric acid and zinc chloride has been investigated in a two‐compartment mixed cell with an anion‐exchange membrane Neosepta‐AFN developed and produced by Tokuyama Soda Co. These experiments have proved that hydrochloric acid permeates well through the membrane used but, on the other hand, zinc chloride is not effectively rejected. The flux of zinc chloride has been found to be increasing with increasing acid and salt concentrations. Furthermore, it has been found that it is approximately one order of magnitude higher than that found in the case of simultaneous transport of sulfuric acid and zinc sulfate through the same membrane. The further calculations concerning the ionic equilibria with sorption isotherms for the HClZnCl2 system, which have been measured experimentally, have revealed that high flux of ZnCl2 is due to the fact that a considerable amount of zinc chloride in the membrane is in the form of ZnCl3− complex, which is relatively small and passes well through this membrane. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 1391–1397, 2006