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Orr J, Dussault P, Chappel C, Goldberg L, Reggiani G. Relation between drug-induced central nervous system effects and plasma levels of diazepam in man. Mod Probl Pharmacopsychiatry 2015; 11:57-67. [PMID: 787769 DOI: 10.1159/000399453] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Pharmacodynamic effects and plasma levels of diazepam were studied in healthy male volunteers at different dose levels. Responses to diazepam were quantified, using instruments which measured body sway (statometry) and psychomotor performance (stressalyser tests). High dose-related correlations were obtained between drug-induced changes in test parameters and drug plasma levels, both with regard to stimulant and depressive effects. Techniques were devised for evaluating and comparing the efficacy and usefulness of different types of tests, taking into account critical thresholds, slopes and error estimates, correcting for changes in predrug levels and control (nondrug) trials.
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Dussault P, Porter NA. The resolution of racemic hydroperoxides: the preparation of optically pure hydroperoxide natural products. J Am Chem Soc 2012; 110:6276-7. [PMID: 22148830 DOI: 10.1021/ja00226a070] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Dussault P, Kyasa S, Fisher T. A Mild One-Pot Conversion of Alkenes into Amines through Tandem Ozonolysis and Reductive Amination. SYNTHESIS-STUTTGART 2011. [DOI: 10.1055/s-0030-1260244] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Abstract
A convenient synthesis of sidechain-modified phytosterols is achieved via a temporary masking of the stigmasterol 5,6-alkene as an epoxide. Following performance of the desired modification, the alkene is regenerated through a mild deoxygenation. The approach is applied to the syntheses of beta-sitosterol and campesterol acetate, and suggests a facile route to the (Z)-isomers of Delta(22-23) phytosterols.
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Affiliation(s)
- Jiliang Hang
- Department of Chemistry, University of Nebraska-Lincoln, 809 Hamilton Hall, Lincoln, NE 68588-0304, USA
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Shchepin R, Xu C, Dussault P. B(C6F5)3-promoted tandem silylation and intramolecular hydrosilylation: diastereoselective synthesis of oxasilinanes and oxasilepanes. Org Lett 2010; 12:4772-5. [PMID: 20919715 PMCID: PMC2967452 DOI: 10.1021/ol1018757] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
B(C(6)F(5))(3) promotes regio- and stereoselective cyclizations of unsaturated alkoxysilanes to generate oxasilinanes and oxasilepanes. The same products are available directly from alkenols via tandem silylation and hydrosilylation.
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Affiliation(s)
| | | | - Patrick Dussault
- Department of Chemistry, University of Nebraska–Lincoln, Lincoln, NE 68588-0304
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Schwartz C, Dussault P. Book Review of Arrow Pushing in Organic Chemistry: An Easy Approach to Understanding Organic Reaction Mechanisms. J Med Chem 2009. [DOI: 10.1021/jm801461g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Chris Schwartz
- Department of ChemistryUniversity of Nebraska—LincolnLincoln, Nebraska 68588-0304
| | - Patrick Dussault
- Department of ChemistryUniversity of Nebraska—LincolnLincoln, Nebraska 68588-0304
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Shchepin R, Hornby JM, Burger E, Niessen T, Dussault P, Nickerson KW. Quorum sensing in Candida albicans: probing farnesol's mode of action with 40 natural and synthetic farnesol analogs. Chem Biol 2003; 10:743-50. [PMID: 12954333 DOI: 10.1016/s1074-5521(03)00158-3] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The dimorphic fungus Candida albicans produces extracellular farnesol (3,7,11-trimethyl-2,6,10-dodecatriene-1-ol) which acts as a quorum-sensing molecule (QSM) to suppress filamentation. Of four possible geometric isomers of farnesol, only the E,E isomer possesses QSM activity. We tested 40 natural and synthetic analogs of farnesol for their activity in an N-acetylglucosamine-induced differentiation assay for germ tube formation (GTF). Modified structural features include the head group, chain length, presence or absence of the three double bonds, substitution of a backbone carbon by S, O, N, and Se heteroatoms, presence or absence of a 3-methyl branch, and the bulkiness of the hydrophobic tail. Of the 40 compounds, 22 showed QSM activity by their ability to reduce GTF by 50%. However, even the most active of the analogs tested had only 7.3% of the activity of E,E-farnesol. Structure-activity relationships were examined in terms of the likely presence in C. albicans of a farnesol binding receptor protein.
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Affiliation(s)
- Roman Shchepin
- Department of Chemistry, University of Nebraska, Lincoln, NE 68588, USA
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Chamberlin AR, Dezube M, Dussault P, McMills MC. Iodocyclization of allylic alcohol derivatives containing internal nucleophiles. Control of stereoselectivity by substituents in the acyclic precursors. J Am Chem Soc 2002. [DOI: 10.1021/ja00356a020] [Citation(s) in RCA: 96] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Dussault P, Sahli A. 2-Methoxy-2-propyl hydroperoxide: a convenient reagent for the synthesis of hydroperoxides and peracids. [Erratum to document cited in CA116(7):58713q]. J Org Chem 2002. [DOI: 10.1021/jo00036a048] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Dussault P. Chiral Intermediates Edited by Cynthia A. Challener. Ashgate Publishing, Burlington, VT. 2001. xxiii + 804 pp. 18 × 25 cm. ISBN 0-5660-8412-0. $295.00. J Med Chem 2002. [DOI: 10.1021/jm020013i] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Patrick Dussault
- Department of Chemistry University of NebraskaLincoln Lincoln, Nebraska 68588-0304
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Hornby JM, Jensen EC, Lisec AD, Tasto JJ, Jahnke B, Shoemaker R, Dussault P, Nickerson KW. Quorum sensing in the dimorphic fungus Candida albicans is mediated by farnesol. Appl Environ Microbiol 2001; 67:2982-92. [PMID: 11425711 PMCID: PMC92970 DOI: 10.1128/aem.67.7.2982-2992.2001] [Citation(s) in RCA: 657] [Impact Index Per Article: 28.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
The inoculum size effect in the dimorphic fungus Candida albicans results from production of an extracellular quorum-sensing molecule (QSM). This molecule prevents mycelial development in both a growth morphology assay and a differentiation assay using three chemically distinct triggers for germ tube formation (GTF): L-proline, N-acetylglucosamine, and serum (either pig or fetal bovine). In all cases, the presence of QSM prevents the yeast-to-mycelium conversion, resulting in actively budding yeasts without influencing cellular growth rates. QSM exhibits general cross-reactivity within C. albicans in that supernatants from strain A72 are active on five other strains of C. albicans and vice versa. The QSM excreted by C. albicans is farnesol (C(15)H(26)O; molecular weight, 222.37). QSM is extracellular, and is produced continuously during growth and over a temperature range from 23 to 43 degrees C, in amounts roughly proportional to the CFU/milliliter. Production is not dependent on the type of carbon source nor nitrogen source or on the chemical nature of the growth medium. Both commercial mixed isomer and (E,E)-farnesol exhibited QSM activity (the ability to prevent GTF) at a level sufficient to account for all the QSM activity present in C. albicans supernatants, i.e., 50% GTF at ca. 30 to 35 microM. Nerolidol was ca. two times less active than farnesol. Neither geraniol (C(10)), geranylgeraniol (C(20)), nor farnesyl pyrophosphate had any QSM activity.
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Affiliation(s)
- J M Hornby
- School of Biological Sciences, University of Nebraska, Lincoln, Nebraska 68588-0666, USA
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Blouin A, Molez S, Pham D, Ayach B, Dussault P, Escher E, Jeng AY, Battistini B. A novel procedure for daily measurements of hemodynamical, hematological, and biochemical parameters in conscious unrestrained rats. J Pharmacol Toxicol Methods 2000; 44:489-505. [PMID: 11395327 DOI: 10.1016/s1056-8719(01)00108-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Accurate and chronic measurements of various parameters in conscious animals are fundamental for depicting pathological chronic conditions and their etiology in many experimental models, but they are often difficult to achieve. The aim of the present work was to develop and describe step-by-step a reproducible surgical procedure and daily manipulations for continuous, chronic use of conscious rats as models towards a better understanding of various cardiovascular and renal diseases and the testing of novel pharmacological drugs. The complete apparatus involved the use of a series of specialized devices (harness, rotating swivel, revolving arm) supporting a flexible, permanently implanted vascular catheter into the left femoral artery up to the abdominal aorta connected to a miniaturized individual peristaltic pump for delivering fluid at a constant rate. Such a set-up also enabled easy, quick, and reproducible daily blood sampling for the evaluation of more than 20 parameters, including the monitoring of heart rate (HR) and blood pressure in freely moving conscious rats. The overall success and survival rate reached 98% over 14 days and could be extended further. This model represents a much needed and valuable advance in surgical research techniques to evaluate the hemodynamic, hematological, biochemical, pharmacokinetic, and toxicological profile of any new drugs over time in conscious animal models such as rats. What makes this procedure satisfactory is the long-term reliable arterial access and reproducibility of the methodological approach for accurate and continuous measurements, minimizing the stress or invasiveness associated with the use of currently employed systems.
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Affiliation(s)
- A Blouin
- Centre de recherche, Hôpital Laval, Institut de cardiologie et de pneumologie, Department of Medicine, Laval University, Ste-Foy, G1V 4G5, QC, Canada
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Abstract
The purpose of this investigation was to study the role of endothelins (ETs) in the pathogenesis of acute pulmonary thromboembolism (PTE). Eighteen piglets (20 +/- 3 kg) were anesthetized and ventilated with 100% oxygen, five of them then served as controls. Acute thromboembolic injury in the lung was induced by injecting 15-25 ml of preformed clots into the left lower lobar pulmonary artery during thoracotomy. Pulmonary arterial pressure (Ppa) increased by at least 2.5-fold from baseline. During the subsequent 8 h, seven blood samples were collected from the left atrium and assayed for immunoreactive ETs. The results showed that following PTE: (1) Ppa remained elevated but cardiac output remained constant throughout the experiments; (2) plasma level of immunoreactive ETs increased in the embolized group compared to controls and the profile of immunoreactive ET release suggested a biphasic response. We conclude that the release of these vasocontractile and bronchoconstrictive mediators after PTE may contribute to ventilation perfusion mismatching and account for the pulmonary hypertension and deterioration of gas exchange that are often seen clinically.
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Affiliation(s)
- J Tsang
- Department of Medicine, University of British Columbia, Vancouver, Canada.
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Dussault P. Stereoselectivity in Synthesis By Tse-Lok Ho. John Wiley & Sons, New York. 1999. xv + 333 pp. 16 × 24.5 cm. ISBN 0471329223. $94.95. J Med Chem 1999. [DOI: 10.1021/jm990548k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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)
- Patrick Dussault
- Department of Chemistry University of Nebraska Lincoln, Nebraska 68588-0304
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Abstract
The endothelins (ETs) are regulatory peptides, distributed in many organ systems and producing potent physiological effects. They are the most powerful vasoconstrictive substances known today. They also act as promitogens. Many data supporting pathophysiological roles for ETs are reported, especially regarding diseases related to the vascular system, such as hypertension, pulmonary hypertension, preeclampsia, ischemic heart diseases, renal failure, subarachnoidal hemorrhage, and cerebral ischemia. The development of drugs blocking ET binding to its receptors (antagonists) and the biosynthesis of ETs (ECE inhibitors) presently attracts great interest in terms of establishing new treatments for diseases in which ETs are believed to be involved. Here we review the evidence supporting a role for ETs in the various etiologies related to ischemia-reperfusion injury, such as is found in heart disease, cerebral ischemia, and organ transplantation.
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Affiliation(s)
- B Battistini
- Heart and Lung Institute, Laval Hospital, Laval University, Ste-Foy, Quebec, Canada.
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Affiliation(s)
- B Battistini
- Department of Medicine, Quebec Heart & Lung Institute, Laval Hospital, 2725 Chemin Ste-Foy, Ste-Foy, Quebec, G1V 4S, Canada
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Affiliation(s)
- B Battistini
- Department of Medicine, Quebec Heart & Lung Institute, Ste-Foy, Quebec, G1V 4G5, Canada
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Porter NA, Dussault P, Breyer RA, Kaplan J, Morelli J. The resolution of racemic hydroperoxides: a chromatography-based separation of perketals derived from arachidonic, linoleic, and oleic acid hydroperoxides. Chem Res Toxicol 1990; 3:236-43. [PMID: 2131835 DOI: 10.1021/tx00015a008] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
In spite of the importance of optically pure unsaturated hydroperoxides in biology, chemistry, and medicine, no general method for synthesizing these labile compounds has been reported. We have developed a chiral vinyl ether that reacts with racemic hydroperoxides to give diastereomeric perketals in high yield. These perketals can be separated by liquid chromatography and the chiral group removed to provide highly enriched hydroperoxide enantiomers (greater than 99% enantiomeric excess). The chiral reagent that has been most successful in our hands is the 2-propenyl ether derived from trans-2-phenylcyclohexanol. By use of this vinyl ether, perketals are readily formed from hydroperoxides, they are stable to normal- and reverse-phase chromatography, and the hydroperoxide is regenerated from the perketal without racemization in high yield with mild acid. Several chiral hydroperoxides have been resolved by this procedure: alpha-phenethyl hydroperoxide, 2-octyl hydroperoxide, and a number of hydroperoxides derived from oleic, linoleic, and arachidonic acids.
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Affiliation(s)
- N A Porter
- Department of Chemistry, Duke University, Durham, North Carolina 27706
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Marier G, MacFarland H, Wiberg GS, Buchwald H, Dussault P. Blood fluorocarbon levels following exposure to household aerosols. Can Med Assoc J 1974; 111:39-42. [PMID: 4841238 PMCID: PMC1947583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Measurement of blood fluorocarbon levels was carried out in subjects exposed to a number of household aerosol products containing fluorocarbon gases as propellants. All aerosols were used according to manufacturers' recommendations. The general purpose of the study was to determine whether with normal routine exposure to a wide variety of household aerosol products fluorocarbon could be found in the blood and if so, to check the potential toxicity of the levels reached. Daily exposure to aerosols according to the study regimen lasted four consecutive weeks; this period was preceded and followed by two weeks of abstention from exposure. At the end of each of the three periods a medical examination, including evaluation of cardiac function, respiratory function studies, and hematological and functional clinical biochemical tests was performed. All tests and assessments failed to show any indication of toxicity. No trace of fluorocarbon was found in any of the blood sampled at intervals during the study.
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Dussault P. [Hematuria]. Vie Med Can Fr 1973; 2:664-6. [PMID: 4760951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Procter BG, Dussault P, Chappel CI. Biochemical effects of sucrose acetate isobutyrate (SAIB) on the liver. Proc Soc Exp Biol Med 1973; 142:595-9. [PMID: 4631994 DOI: 10.3181/00379727-142-37074] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Dussault P. [Dysuria]. Vie Med Can Fr 1973; 2:64-6. [PMID: 4711747] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Dussault P. A study in postpartum care. J Pract Nurs 1968; 38:25-6. [PMID: 5186838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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