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Millot N, Aymes D, Bernard F, Niepce JC, Traverse A, Bourée F, Cheng BL, Perriat P. Particle Size Dependency of Ternary Diagrams at the Nanometer Scale: Evidence of TiO2 Clusters in Fe-Based Spinels. J Phys Chem B 2003. [DOI: 10.1021/jp022312p] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- N. Millot
- Laboratoire de Recherches sur la Réactivité des Solides, UMR 5613 CNRS/Université de Bourgogne, BP 47870, 21078 Dijon Cedex, France, Laboratoire pour l'Utilisation du Rayonnement Electromagnétique, UMR 130 CNRS, Bât. 209A, 91898 Orsay Cedex, France, Laboratoire Léon Brillouin, CEA-CNRS, CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France, IRC in Materials Processing, The University of Birmingham, Edgbaston B15 2TT, United Kingdom, and Groupe d'Etudes de Métallurgie Physique et de Physique des Matériaux, UMR
| | - D. Aymes
- Laboratoire de Recherches sur la Réactivité des Solides, UMR 5613 CNRS/Université de Bourgogne, BP 47870, 21078 Dijon Cedex, France, Laboratoire pour l'Utilisation du Rayonnement Electromagnétique, UMR 130 CNRS, Bât. 209A, 91898 Orsay Cedex, France, Laboratoire Léon Brillouin, CEA-CNRS, CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France, IRC in Materials Processing, The University of Birmingham, Edgbaston B15 2TT, United Kingdom, and Groupe d'Etudes de Métallurgie Physique et de Physique des Matériaux, UMR
| | - F. Bernard
- Laboratoire de Recherches sur la Réactivité des Solides, UMR 5613 CNRS/Université de Bourgogne, BP 47870, 21078 Dijon Cedex, France, Laboratoire pour l'Utilisation du Rayonnement Electromagnétique, UMR 130 CNRS, Bât. 209A, 91898 Orsay Cedex, France, Laboratoire Léon Brillouin, CEA-CNRS, CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France, IRC in Materials Processing, The University of Birmingham, Edgbaston B15 2TT, United Kingdom, and Groupe d'Etudes de Métallurgie Physique et de Physique des Matériaux, UMR
| | - J. C. Niepce
- Laboratoire de Recherches sur la Réactivité des Solides, UMR 5613 CNRS/Université de Bourgogne, BP 47870, 21078 Dijon Cedex, France, Laboratoire pour l'Utilisation du Rayonnement Electromagnétique, UMR 130 CNRS, Bât. 209A, 91898 Orsay Cedex, France, Laboratoire Léon Brillouin, CEA-CNRS, CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France, IRC in Materials Processing, The University of Birmingham, Edgbaston B15 2TT, United Kingdom, and Groupe d'Etudes de Métallurgie Physique et de Physique des Matériaux, UMR
| | - A. Traverse
- Laboratoire de Recherches sur la Réactivité des Solides, UMR 5613 CNRS/Université de Bourgogne, BP 47870, 21078 Dijon Cedex, France, Laboratoire pour l'Utilisation du Rayonnement Electromagnétique, UMR 130 CNRS, Bât. 209A, 91898 Orsay Cedex, France, Laboratoire Léon Brillouin, CEA-CNRS, CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France, IRC in Materials Processing, The University of Birmingham, Edgbaston B15 2TT, United Kingdom, and Groupe d'Etudes de Métallurgie Physique et de Physique des Matériaux, UMR
| | - F. Bourée
- Laboratoire de Recherches sur la Réactivité des Solides, UMR 5613 CNRS/Université de Bourgogne, BP 47870, 21078 Dijon Cedex, France, Laboratoire pour l'Utilisation du Rayonnement Electromagnétique, UMR 130 CNRS, Bât. 209A, 91898 Orsay Cedex, France, Laboratoire Léon Brillouin, CEA-CNRS, CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France, IRC in Materials Processing, The University of Birmingham, Edgbaston B15 2TT, United Kingdom, and Groupe d'Etudes de Métallurgie Physique et de Physique des Matériaux, UMR
| | - B. L. Cheng
- Laboratoire de Recherches sur la Réactivité des Solides, UMR 5613 CNRS/Université de Bourgogne, BP 47870, 21078 Dijon Cedex, France, Laboratoire pour l'Utilisation du Rayonnement Electromagnétique, UMR 130 CNRS, Bât. 209A, 91898 Orsay Cedex, France, Laboratoire Léon Brillouin, CEA-CNRS, CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France, IRC in Materials Processing, The University of Birmingham, Edgbaston B15 2TT, United Kingdom, and Groupe d'Etudes de Métallurgie Physique et de Physique des Matériaux, UMR
| | - P. Perriat
- Laboratoire de Recherches sur la Réactivité des Solides, UMR 5613 CNRS/Université de Bourgogne, BP 47870, 21078 Dijon Cedex, France, Laboratoire pour l'Utilisation du Rayonnement Electromagnétique, UMR 130 CNRS, Bât. 209A, 91898 Orsay Cedex, France, Laboratoire Léon Brillouin, CEA-CNRS, CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France, IRC in Materials Processing, The University of Birmingham, Edgbaston B15 2TT, United Kingdom, and Groupe d'Etudes de Métallurgie Physique et de Physique des Matériaux, UMR
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Abstract
Urotensin II is the latest of a growing list of peptides exhibiting potent cardiovascular effects. It is an extremely potent vasoconstrictor in primates; its excretion is elevated in hypertensive patients thus suggesting therapeutic potential for urotensin II analogues, particularly receptor antagonists. In the present study, a number of interesting structural features pertaining to the N-terminus of urotensin II have been evaluated for binding to cloned human and rat urotensin II receptors and functional effects on rat upper thoracic aorta smooth muscle preparations. Shortened octapeptides retained full binding affinities and functional activities, did not require a free N-terminal amino group, and could tolerate an amidated C-terminus. The N-terminal Asp residue present in the octapeptides did not require a negatively charged side chain, merely one which contained a hydrogen bond acceptor CO group which could be present at a variety of positions on the side chain. The side chain could be constrained into a trans-olefinic configuration with full retention of potency, but potency was lost in the cis configuration. N-terminal aromatic amino substituted with polar groups such as OH and NO(2) also resulted in high affinity analogues. Overall, the correlation between binding affinities for the human and rat receptors was quite good. These findings could be of value in the development of more potent urotensin II receptor antagonists based on the previously identified somatostatin antagonist octapeptides which we have recently found, function as relatively weak urotensin II antagonists.
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Affiliation(s)
- D H Coy
- Department of Medicine, Peptide Research Laboratories, Health Sciences Center, Tulane University, 1430 Tulane Avenue, New Orleans, LA 70112, USA.
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Wang GP, Cheng BL, Cai WJ. [Expression and cloning of two novel genes induced by ischemia and reperfusion]. Hunan Yi Ke Da Xue Xue Bao 2001; 26:313-6. [PMID: 12536721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
OBJECTIVE To identify and clone the differentially expressed genes in brief ischemia and reperfusion myocardium. METHODS Ischemia and reperfusion were induced by repeated brief ligation of the porcine left anterior descending coronary artery. Total RNA which was isolated from myocardium subjected ischemia and reperfusion was used for mRNA differential display. After cloning and sequencing the cDNA fragments which showed change in expression, their expression were further confirmed by Northern-Blot analysis. RESULTS Two differentially expressed cDNAs (W12 and W28) were identified and cloned. Their expression were subsequently confirmed to be truly differentially expressed. The expression of both genes in ischemia and reperfusion myocardium was obvious higher than that in nonischemia and reperfusion: W12 expression level was 2-fold (P < 0.05), and W28 expression level 1.9-fold (P < 0.05). In addition, mRNAs of W12 and W28 were existed in all tested organs including heart, liver, lung, kidney, spleen, intestine, brain and skeletal muscle. DNA sequencing analysis showed that there was no homology between W12, W28 and known genes, implying that they would represent novel gene respectively. CONCLUSION Two novel genes induced by ischemia and reperfusion are identified, cloned and confirmed.
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Affiliation(s)
- G P Wang
- Central Laboratory, Xiangya Hospital, Central South University, Changsha 41008, China
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Coy DH, Mungan Z, Rossowski WJ, Cheng BL, Lin JT, Mrozinski JE, Jensen RT. Development of a potent bombesin receptor antagonist with prolonged in vivo inhibitory activity on bombesin-stimulated amylase and protein release in the rat. Peptides 1992; 13:775-81. [PMID: 1279632 DOI: 10.1016/0196-9781(92)90186-7] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Of the various types of potent bombesin(Bn)/gastrin releasing peptide receptor antagonists that have been discovered, the desMet14-methyl ester peptides are devoid of residual agonist activity and are among the most potent in terms of in vitro receptor blockade and also in terms of their prolonged inhibition of bombesin-stimulated amylase and protein release in the rat. We have now examined the in vitro and in vivo properties of a new series of methyl ester analogues, [D-Phe6]Bn(6-13)OMe, [D-Phe6,D-Ala11]Bn(6-13)OMe, N alpha-propionyl-[D-Ala24]GRP(20-26)OMe, and [D-pentafluoro-Phe6,D-Ala11]Bn(6-13)OMe, which have an additional D-amino acid substituent and some highly lipophilic moieties at the N-terminus. All analogues were able to potently antagonize the ability of Bn to stimulate amylase release from rat acinar cells, with IC50 values of 2.4, 2.5, 0.6, and 1.3 nM, respectively. The four peptides were found to have binding affinities for these cells comparable to Bn itself, with K(i)s of 10.3, 2.8, 5.5, and 3.6 nM, respectively, but all had little or no affinity for neuromedin B receptors on murine C6 cells. Single bolus IV injections of these peptides were found to potently inhibit amylase and protein release caused by IV infusion of bombesin into the rat. Generally the peptides containing the D-Ala substituent were longer acting than [D-Phe6]Bn(6-13)OMe, so that [D-Phe6,D-Ala11]Bn(6-13)OMe and N alpha-propionyl-[D-Ala24]GRP(20-26)OMe displayed significant inhibitory effects for up to 1.5 h after administration.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- D H Coy
- Department of Medicine, Tulane University Medical Center, New Orleans, LA 70112
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