151
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Bouchard J, Wakim S, Leclerc M. Synthesis ofN‐Octyl‐2,7‐dimethoxy‐1,8‐bistrimethylsilyl‐3,6‐dibromocarbazole. SYNTHETIC COMMUN 2004. [DOI: 10.1081/scc-200026205] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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152
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Brunette MG, Leclerc M, Couchourel D, Mailloux J, Bourgeois Y. Characterization of three types of calcium channel in the luminal membrane of the distal nephron. Can J Physiol Pharmacol 2004; 82:30-7. [PMID: 15052303 DOI: 10.1139/y03-127] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
We previously reported a dual kinetics of Ca2+transport by the distal tubule luminal membrane of the kidney, suggesting the presence of several types of channels. To better characterize these channels, we examined the effects of specific inhibitors (i.e., diltiazem, an L-type channel; ω-conotoxin MVIIC, a P/Q-type channel; and mibefradil, a T-type channel antagonist) on 0.1 and 0.5 mM Ca2+uptake by rabbit nephron luminal membranes. None of these inhibitors influenced Ca2+uptake by the proximal tubule membranes. In contrast, in the absence of sodium (Na+), the three channel antagonists decreased Ca2+transport by the distal membranes, and their action depended on the substrate concentrations: 50 µM diltiazem decreased 0.1 mM Ca2+uptake from 0.65 ± 0.07 to 0.48 ± 0.06 pmol·µg–1·10 s–1(P < 0.05) without influencing 0.5 mM Ca2+transport, whereas 100 nM ω-conotoxin MVIIC decreased 0.5 mM Ca2+uptake from 1.02 ± 0.05 to 0.90 ± 0.05 pmol·µg–1·10 s–1(P < 0.02) and 1 µM mibefradil decreased it from 1.13 ± 0.09 to 0.94 ± 0.09 pmol·µg–1·10 s–1(P < 0.05); the latter two inhibitors left 0.1 mM Ca2+transport unchanged. Diltiazem decreased the Vmaxof the high-affinity channels, whereas ω-conotoxin MVIIC and mibefradil influenced exclusively the Vmaxof the low-affinity channels. These results not only confirm that the distal luminal membrane is the site of Ca2+channels, but they suggest that these channels belong to the L, P/Q, and T types.Key words: renal calcium transport, calcium channels, diltiazem, mibefradil, ω-conotoxin.
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153
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Leclerc M, Ho HA. Affinitychromic Polythiophenes: A Novel Bio-Photonic Tool for High-Throughput Screening and Diagnostics. Synlett 2004. [DOI: 10.1055/s-2003-44971] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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154
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Beaupré S, Leclerc M. Optical and Electrical Properties of π-Conjugated Polymers Based on Electron-Rich 3,6-Dimethoxy-9,9-dihexylfluorene Unit. Macromolecules 2003. [DOI: 10.1021/ma035064j] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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155
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Bouchard J, Belletête M, Durocher G, Leclerc M. Solvatochromic Properties of 2,7-Carbazole-Based Conjugated Polymers. Macromolecules 2003. [DOI: 10.1021/ma034098o] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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156
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Ho HA, Leclerc M. New colorimetric and fluorometric chemosensor based on a cationic polythiophene derivative for iodide-specific detection. J Am Chem Soc 2003; 125:4412-3. [PMID: 12683798 DOI: 10.1021/ja028765p] [Citation(s) in RCA: 265] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Electrostatic interactions between anions and a new water-soluble, cationic, affinitychromic poly(3-alkoxy-4-methylthiophene) derivative provide a new tool for a selective optical detection method (colorimetric or fluorometric) for iodide ions.
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157
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Tirapattur S, Belletête M, Drolet N, Leclerc M, Durocher G. Steady-state and time-resolved studies of 2,7-carbazole-based conjugated polymers in solution and as thin films: determination of their solid state fluorescence quantum efficiencies. Chem Phys Lett 2003. [DOI: 10.1016/s0009-2614(03)00178-7] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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158
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Garreau S, Leclerc M, Errien N, Louarn G. Planar-to-Nonplanar Conformational Transition in Thermochromic Polythiophenes: A Spectroscopic Study. Macromolecules 2003. [DOI: 10.1021/ma021358d] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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159
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Morin JF, Boudreault PL, Leclerc M. Blue-Light-Emitting Conjugated Polymers Derived From 2,7-Carbazoles. Macromol Rapid Commun 2002. [DOI: 10.1002/marc.200290000] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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160
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161
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Drolet N, Beaupr S, Morin JF, Tao Y, Leclerc M. Red green blue light-emitting diodes containing fluorene-based copolymers. ACTA ACUST UNITED AC 2002. [DOI: 10.1088/1464-4258/4/6/362] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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162
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Bernier S, Garreau S, Béra-Abérem M, Gravel C, Leclerc M. A versatile approach to affinitychromic polythiophenes. J Am Chem Soc 2002; 124:12463-8. [PMID: 12381187 DOI: 10.1021/ja027387l] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The preparation of both postfunctionalizable and chromic poly[3-(N-succinimido-p-phenylcarboxylate(tetraethoxy)oxy)-4-methylthiophene] is reported. The N-hydroxysuccinimide ester side group can easily react with different amine-bearing molecules in the solid state to yield a library of new polythiophene derivatives. The resulting polymers can be dissolved in various solvents, and interactions between the side chains (ligands) and different analytes (targets) can be detected from modifications of both the side-chain and the backbone conformations resulting in important color changes (i.e., affinitychromism). This colorimetric polymeric transducer could therefore lead to highly valuable, versatile, and inexpensive tools for highthroughput screening and drug discovery.
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163
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Tirapattur S, Belletête M, Drolet N, Leclerc M, Durocher G. Spectral and Photophysical Properties of Fluorene-Based Polyesters in Solution and in the Solid State. Macromolecules 2002. [DOI: 10.1021/ma0209444] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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164
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Morin JF, Leclerc M. 2,7-Carbazole-Based Conjugated Polymers for Blue, Green, and Red Light Emission. Macromolecules 2002. [DOI: 10.1021/ma020880x] [Citation(s) in RCA: 171] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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165
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Tirapattur S, Belletête M, Drolet N, Bouchard J, Ranger M, Leclerc M, Durocher G. Spectroscopic Study of Intermolecular Interactions in Various Oligofluorenes: Precursors of Light-Emitting Polymers. J Phys Chem B 2002. [DOI: 10.1021/jp0143544] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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166
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Ho HA, Boissinot M, Bergeron MG, Corbeil G, Doré K, Boudreau D, Leclerc M. Colorimetric and Fluorometric Detection of Nucleic Acids Using Cationic Polythiophene Derivatives. Angew Chem Int Ed Engl 2002. [DOI: 10.1002/1521-3757(20020503)114:9<1618::aid-ange1618>3.0.co;2-2] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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167
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Ho HA, Boissinot M, Bergeron MG, Corbeil G, Doré K, Boudreau D, Leclerc M. Colorimetric and Fluorometric Detection of Nucleic Acids Using Cationic Polythiophene Derivatives. Angew Chem Int Ed Engl 2002. [DOI: 10.1002/1521-3773(20020503)41:9%3c1548::aid-anie1548%3e3.0.co;2-i] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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168
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Ho HA, Boissinot M, Bergeron MG, Corbeil G, Doré K, Boudreau D, Leclerc M. Colorimetric and Fluorometric Detection of Nucleic Acids Using Cationic Polythiophene Derivatives. Angew Chem Int Ed Engl 2002; 41:1548-51. [DOI: 10.1002/1521-3773(20020503)41:9<1548::aid-anie1548>3.0.co;2-i] [Citation(s) in RCA: 430] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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169
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Faid K, Cloutier R, Leclerc M. Design of novel electroactive polybithiophene derivatives. Macromolecules 2002. [DOI: 10.1021/ma00062a017] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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170
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Robitaille L, Leclerc M. Synthesis, Characterization, and Langmuir-Blodgett Films of Fluorinated Polythiophenes. Macromolecules 2002. [DOI: 10.1021/ma00085a028] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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171
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Belletete M, Leclerc M, Durocher G. Potentialities of Semiempirical Calculations (AMPAC and INDO/S) in Determining the Conformation and Electronic Properties of 2,2'-Bithiophene: A New Joint Experimental and Theoretical Approach. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100089a016] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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172
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Daoust G, Leclerc M. Structure-property relationships in alkoxy-substituted polythiophenes. Macromolecules 2002. [DOI: 10.1021/ma00002a018] [Citation(s) in RCA: 158] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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173
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Belletete M, Mazerolle L, Desrosiers N, Leclerc M, Durocher G. Spectroscopy and Photophysics of Some Oligomers and Polymers Derived from Thiophenes. Macromolecules 2002. [DOI: 10.1021/ma00129a018] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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174
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D'Aprano G, Leclerc M, Zotti G. Stabilization and characterization of pernigraniline salt: the "acid-doped" form of fully oxidized polyanilines. Macromolecules 2002. [DOI: 10.1021/ma00034a013] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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175
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