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Minireview series reflects the diverse biological functions that are continuously emerging from its simple, repetitive structure. The first minireview in this series, "Hyaluronan and Homeostasis: a Balancing Act, " by Markku I. Tammi, Anthony J. Day, and Eva A. Turley discusses the structure and metabolism of hyaluronan. Significant milestones include the identification of hyaluronan-binding molecules with signaling properties, including CD44 and RHAMM, and the molecular cloning of the family of prokaryotic and eukaryotic hyaluronan synthases. Gene deletion by homologous recombination in embryonic stem cells demonstrates the essential roles of hyaluronan in vertebrate development and in the expansion of extracellular spaces. Studies with cells that are deficient in hyaluronan synthase and thus deficient in hyaluronan ; provide dramatic confirmation of the requirement for hyaluronan in developmentally regulated transformation of epithelial cells to invasive mesenchymal cells in morphogenesis of the heart. This process requires Ras activation and argues compellingly for a hyaluronan-mediated mechanism involving activation of intracellular signaling pathways. This minireview also appraises the important role of hyaladherins, proteins that bind to hyaluronan, in the formation of the hyaluronan-rich pericellular matrix and in signaling responses to hyaluronan. The provocative discovery of intracellular hyaluronan and associated hyaluronan-binding proteins opens a new chapter in hyaluronan biology. In order for hyaluronan to function as more than simply a viscous, space-filling glycosaminoglycan, it must interact with the specific binding domains in hyaladherins. The second minireview, "Hyaluronan-binding Proteins: Tying up the Giant, " by Anthony J. Day and Glenn D. Prestwich reviews the current status of the structures of proteins and proteoglycans that bind hyaluronan. The tertiary structure of the link module, the best characterized hyaluronan-binding domain, has been solved for one member of the family of proteins that contain this domain, namely tumor necrosis factor-stimulated gene-6 TSG-6 ; . This module is found in extracellular matrix molecules such as the proteoglycans aggrecan and versican and on cell surface receptors such as CD44. However, a number of other proteins without the link module also bind to hyaluronan with high specificity. It remains to be seen if these proteins have tertiary structural topographies similar to the link module family that underlie their ability to interact with hyaluronan. Exposure of certain cells to hyaluronan results in activation of intracellular signaling pathways. The third minireview, "Signaling Properties of Hyaluronan Receptors, " by Eva A. Turley, Paul W. Noble, and Lilly Y. W. Bourguignon delves inside the cell to begin to unravel these pathways and their consequences. CD44 is the best understood hyaluronan receptor and can engage Rho and Ras signaling pathways, interact with c-Src tyrosine kinase, and recruit ankyrin and ezrin radixin moesin cytoskeleton proteins. Thus, multiple cellular behaviors ranging from a highly structured cytoskeleton typical of an organized epithelium to ruffling and migration can potentially be induced by hyaluronan. For example, low, physiological concentrations nanomolar ; of hyaluronan can increase cell motility with both Ras-mitogen-activated protein kinase and phosphoinositide 3-kinase pathways implicated. Similarly, we have found that exposure of endocardial cells from animals deficient in hyaluronan synthase 2 to very low concentrations of hyaluronan stimulates their migration and subsequent transformation to mesenchymal phenotype. This suggests that hyaluronan can act as a co-stimulatory molecule with growth factors resulting in pluripotent cellular outcomes depending upon the repertoire of co-receptors present. Cells and animal models derived from hyaluronan-synthase null mice will be valuable tools in unraveling the signaling mechanisms underlying these outcomes. Another hyaluronan receptor, RHAMM, has a peripatetic existence inside and on cells, complicating elucidation of its protean signaling properties and other potential roles, and this minireview presents a current view of its localization and functions.
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18. Mullins RJ and Bell DR. Changes in interstitial volume and masses of albumin and IgG in rabbit skin and skeletal muscle after saline volume loading. Circ Res 51: 305313, 1982. Noble PW. Hyaluronan and its catabolic products in tissue injury and repair. Matrix Biol 21: 2529, 2002. Pienimaki JP, Rilla K, Fulop C, Sironen RK, Karvinen S, Pasonen S, Lammi MJ, Tammi R, Hascall VC, and Tammi MI. Epidermal growth factor activates hyaluronan synthase 2 in epidermal keratinocytes and increases pericellular and intracellular hyaluronan. J Biol Chem 276: 2042820435, 2001. Rahmanian M and Heldin P. Testicular hyaluronidase induces tubular structures of endothelial cells grown in threedimensional collagen gel through a CD44-mediated mechanism. Int J Cancer 97: 601607, 2002. Reed RK, Laurent UBG, King S, Fraser JRE, and Laurent TC. Effect of increased interstitial fluid flux on fractional catabolic rate of high molecular weight [3H]hyaluronan injected in rabbit skin. Acta Physiol Scand 156: 9398, 1996. Reed RK, Lilja K, and Laurent TC. Hyaluronan in the rat with special reference to the skin. Acta Physiol Scand 134: 405411, 1988. Reed RK, Townsley MI, Zhao Z, Ishibashi M, Laurent TC, and Taylor AE. Lymphatic hyaluronan flux from skin increases during increased lymph flow induced by intravenous saline loading. Int J Microcirc Clin Exp 14: 5661, 1994. Reissig JL, Strominger JL, and Leloir LR. A modified colometric method for the estimation of N-acetylamino sugars. J Biol Chem 217: 959966, 1955. Richman PG and Baer H. A convenient plate assay for the quantitation of hyaluronidase in Hymenoptera venoms. Anal Biochem 109: 376381, 1980.
And C with cosmic abundances. Further important experiments about the nucleation of refractory compounds have been carried out by Donn and coworker. They investigated the nucleation of SiO Nuth & Donn, 1982 ; , amorphous magnesium silicate Nuth & Donn, 1983 ; , silver Nuth et al., 1986 ; , magnesium Fergurson et al., 1996 ; , and lithium Ferguson & Nuth, 2000 ; . One important finding of their experiment about the condensation of a silicon monoxide is, that the stoichiometric composition of the solid particles formed in their apparatus is SiOx with x 1.5. The experimental data are interpreted in terms of classical homogeneous nucleation rate. Depending on the formula used to express the size dependence of G, they obtain a value of 0.5 J m2 and 0.65 J m2 , respectively see also table 5.1 ; . Nonetheless the results cast some doubt on the applicability of the classical homogeneous nucleation theory to the condensation of silicon monoxide. In another experiment Nuth & Donn 1983 ; investigated the nucleation in the MgSiOH2 system. They conclude that the onset of nucleation is unaffected by the presence of magnesium and that the critical nuclei are pure SiO ; N clusters. Hale et al. 1989 ; presented an analysis of the nucleation data of Nuth & Donn 1982 ; using the scaled nucleation theory, which is described in Hale 1986 ; . They find a slightly higher value for then in the original article see table 5.1 ; . We are unaware of any publications dealing with the condensation of solid SiO2 . Spectroscopically the most prominent features of quartz are located approximately at 9.7 m and 19 m. They are attributed to the stretching and bending modes of the SiO bond in the SiO4 tetrahedron of solid silica Whittet, 1989 ; . According to Morioka et al. 1998 ; the exact position of the 9.7 m feature depends on the temperature of the sample and on its oxygen content. They observe a variation of the peak position due to the Si O stretching mode between 9.2 m and 10.2 m, while the peak attributed to the SiO bending mode, can be found between 19.5 m and 22.5 m. Furthermore they identify a feature positioned between 11.4 m and 13.5 m, which is caused by SiSi stretching modes. The samples investigated by Morioka et al. consisted of a mixture of different.
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SB202190, and 300nM SP600125 to inhibit the p42 44, p38 MAPK, and JNK pathways, respectively. 120pM IL-1 was added, and cells were allowed to incubate overnight at 37 C. Hyaluronan levels that accumulated in the 24 h time period were determined as well as HAS2 transcript levels. Inhibition of the p42 44 pathway reduced hyaluronan expression to approximately 37% of that observed in cells treated with IL-1 only Fig 5 ; . Inhibition of the p38 MAPK pathway reduced hyaluronan expression to only about 7% of what was produced by cells treated with IL-1 only Fig. 5 ; . There was no significant reduction in hyaluronan expression 92% of IL-1 alone ; when the JNK pathway was inhibited. Hyaluronan levels expressed by cells treated with all three inhibitors were not significantly different than those treated only with the inhibitor of the p38 pathway. Likewise, the p42 44 and p38 MAPK inhibitors blocked the IL-1 induction of HAS2 transcripts whereas the JNK inhibitor had little effect Fig. 6A and B ; . None of the MAPK inhibitors appeared to significantly alter cyclophilin transcript levels. Molecular Weight Profile of IL-1-mediated induced Hyaluronan in Jejunum-Derived Mesenchymal Cells- There is evidence that the molecular weight of nascent hyaluronan is dependent upon the HAS isoform involved in its synthesis 31 ; . The molecular weight of hyaluronan has been shown to influence its biological function 21; 30; 40-42 . The effects of IL-1 and TNF on the molecular mass of hyaluronan present in the culture media was examined. Media fractions were size fractionated by electrophoresis in 0.5% agarose gels. The hyaluronan was transferred to a derivatized nitrocellulose membrane and then probed using a biotinylated hyaluronan binding protein. As expected, little or no hyaluronan was detected in media from untreated cells Fig. 7, lane 4 ; . The medium from cells treated with IL-1 or IL-1 plus TNF- contained hyaluronan with an apparent molecular weight greater than 1 x 106 Da Fig. 7, lane 5&6 ; . In addition, medium from cells treated with both IL-1 and TNF- also generated a secondary peak of hyaluronan centered around 5 x 105 Da. Pretreatment with PD98058, SB202190 or the combination of all three MAP kinase inhibitors prior to adding IL-1 decreased the entire molecular weight range of hyaluronan Fig. 7, lanes 7, 8 & 10.
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Curves were the same. The values of kaP, kaL, kdP, and kdL that were retained allowed adequate simulations of all the kinetics, including the transfer to albumin. These values were found to be similar to those given in Table 1. The validity of the approximations made and the fact that kdL is higher than kdP were confirmed. However, simulations did not predict a third slow phase. Thus, the aqueous phase transfer model accounts for the fast steps but does not explain the slower step. That will be discussed below. DISCUSSION The quenching of the intrinsic apoprotein fluorescence and changes in the fluorescence of porphyrins upon interaction and hydralazine.
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Resulted in upregulation of the dosR regulon, as did growth on the reduced carbon source palmitate. The effect of NO on the dosR regulon could be fully reversed by cyanide, menadione and clofazimine, all of which could reoxidize the nitrosylferroheme of cytochromes Fig. 8 ; . Notably all three also were found to result in resumption of oxygen consumption results not shown ; . In contrast, the CcO-specific inhibitors cyanide and azide ; and agents that affect maturation of CcO ZnSO4 and DTT ; resulted in upregulation of the cyd operon cydA, cydB, cydD and cydC ; encoding the non-proton pumping cytochrome bd oxidase Fig. 2 ; . Unlike other bacterial systems Poole and Cooke, 2000 ; , we did not observe upregulation of the cyd regulon during H2O2 or menadione treatment. The cyd regulon was also upregulated during adaption to hypoxic conditions as has been reported for M. smegmatis 46 ; as well as during growth on palmitate, indicating that upregulation of the dosR regulon and cyd genes was not mutually exclusive. The cyd operon was highly responsive to alterations in transmembrane proton gradient by treatment with protonophores such as CCCP, DNP, and Nigericin. Intracellular acidification would also affect maintenance of the transmembrane proton gradient and indeed amides such as pyrazinamide also resulted in upregulation of the cyd operon. Since changes in the pyridine nucleotide or respiratory quinol redox poises are associated with modulation of expression of respiratory components in a variety of bacteria 47, 48, 49 ; , the reduced versus oxidized forms of these molecules were measured with a variety of respiratory inhibitors that affected the expression of the cyd operon or the dosR regulon Table 1 ; . This indicated that the regulation of these gene sets could not be simply correlated with the redox state of these electron carriers!
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Although scd44 transfectants displayed a marked reduction in their ability to internalize and degrade hyaluronan, they elicited abundant local hyaluronan production within invaded lung tissue, comparable to that induced by parental cells.
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The cell-surface glycoprotein CD44 is a receptor for the extracellular matrix glycosaminoglycan hyaluronan HA ; 1 15 ; CD44 can mediate leukocyte rolling on HA substrates, such as those presented on endothelial cells activated by inflammatory cytokines, and has been implicated in leukocyte migration to sites of inflammation and in tumor cell metastasis 6 10 ; . Rolling is an early step in the cascade of events leading to extravasation from the blood stream into tissues, employed by.
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Atrial septal aneurysms are the protrusions of the interatrial septum into the left or right atrium. Their detection rate by conventional transthoracic echocardiography is 0.12-0.52% while prevalence by transesophageal approach is 3-8% 1 ; . Correlation between atrial septal aneurysm and ischemic strokes without any identifiable cause or cardiac embolism was established in many studies 2-4 ; . We reviewed the surgical treatment of the atrial septal aneurysms with concomitant cardiovascular abnormalities in three patients operated in our clinic between January 2002 and December 2003. The patients data are summarized in the Table 1. Atrial septal aneurysm is usually associated with other anomalies rather than being alone 1 ; . Hanley 3 ; classified atrial septal aneurysm in type I; aneurysm is limited to the base of fossa ovalis fossa ovalis aneurysm ; , while in type II, aneurysm extends to the whole interatrial septum. Type I aneurysms are subdivided into groups A and B. Oscillatory movement is less than 5 mm for group A and more than 5 mm for group B. The risk of cardiac embolization does not differ between the two groups 3 ; . Cardiac abnormalities that are associated with atrial septal aneTable 1. Summary of patients data Case Age, years Sex Complaints Functional Capacity ECG Echocardiography Angiography Operative Findings Operation 1 39 Female Dyspnea NYHA Class III Sinus rhythm Mitral stenosis, ASA 2.4cmx1.4cm ; ASA on fossa ovalis, polypoid, penetrating deep into left atrium MVR, ASA resection, primary repair of interatrial septum and idarubicin.
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