Medicinal and Pharmaceutical Chemistry Commons^™

Tobramycin-Induced Hepatotoxicity, Sarah A. Nisly, Shaunta' M. Ray, Robert A. Moye

Scholarship and Professional Work – COPHS

OBJECTIVE. To report a case of tobramycin-induced hepatotoxicity. CASE

SUMMARY: A 20-year-old female was hospitalized for treatment of Pseudomonas aeruginosa bacteremia and osteomyelitis. Empiric intravenous antibiotic therapy with piperacillin/tazobactam, vancomycin, and ciprofloxacin was started, and based on the results of culture and sensitivity testing, was changed to intravenous ceftazidime and tobramycin 70 mg every 8 hours on hospital day 3. Liver enzyme levels then increased over days 3–6. Tests for hepatitis A, B, and C were all nonreactive, and HIV testing was negative. On day 8, therapy was changed from ceftazidime to piperacillin/tazobactam and the tobramycin dose was increased …

Trypanothione Reductase: A Viable Chemotherapeutic Target For Antitrypanosomal And Antileishmanial Drug Design, M. O. Faruk Khan

Pharmaceutical Science and Research

Trypanosomiasis and leishmaniasis are two debilitating disease groups caused by parasites of Trypanosoma and Leishmania spp. and affecting millions of people worldwide. A brief outline of the potential targets for rational drug design against these diseases are presented, with an emphasis placed on the enzyme trypanothione reductase. Trypanothione reductase was identified as unique to parasites and proposed to be an effective target against trypanosomiasis and leishmaniasis. The biochemical basis of selecting this enzyme as a target, with reference to the simile and contrast to human analogous enzyme glutathione reductase, and the structural aspects of its active site are presented. The …

Antitrypanosomal, Antileishmanial, And Antimalarial Activities Of Quaternary Arylalkylammonium 2-Amino-4-Chlorophenyl Phenyl Sulfides, A New Class Of Trypanothione Reductase Inhibitor, And Of N-Acyl Derivatives Of 2-Amino-4-Chlorophenyl Phenyl Sulfide, Seheli Parveen, M. O. Faruk Khan, Susan E. Austin, Simon L. Croft, Vanessa Yardley, Peter Rock, Kenneth T. Douglas

Pharmaceutical Science and Research

Quaternization of the nitrogen atom of 2-amino-4-chlorophenyl phenyl sulfide analogues of chlorpromazine improved inhibition ∼40-fold (3′,4′-dichlorobenzyl-[5-chloro-2-phenylsulfan- ylphenylamino)-propyl]-dimethylammonium chloride inhibited trypanothione reductase from Trypanosoma cruzi with a linear competitive Ki value of 1.7 ( 0.2 µM). Molecular modelling explained docking orientations and energies by: (i) involvement of the Z-site hydrophobic pocket (roughly bounded by F396′, P398′, and L399′), (ii) ionic interactions for the cationic nitrogen with Glu-466′ or -467′. A series of N-acyl-2-amino-4-chlorophenyl sulfides showed mixed inhibition (Ki, Ki′ ) 11.3-42.8 µM). The quaternized analogues of the 2-chlorophenyl phenylsulfides had strong antitrypanosomal and antileishmanial activity in vitro against T. bruceirhodesiense STIB900, …

Toll-Like Receptor-4 Regulation Of Hepatic Cyp3a11 Metabolism In A Mouse Model Of Lps-Induced Cns Inflammation, Kerry B. Goralski, Dalya Abdulla, Christopher J. Sinal, Andre Arsenault, Kenneth W. Renton

Faculty Publications and Scholarship

Central nervous system (CNS) infection and inflammation severely reduce the capacity of cytochrome P-450 metabolism in the liver. We developed a mouse model to examine the effects of CNS inflammation on hepatic cytochrome P-450 metabolism. FVB, C57BL/6, and C3H/HeouJ mice were given Escherichia coli LPS (2.5 μg) by intracerebroventricular (ICV) injection. The CNS inflammatory response was confirmed by the elevation of TNF-α and/or IL-1β proteins in the brain. In all mouse strains, LPS produced a 60–70% loss in hepatic Cyp3a11 expression and activity compared with saline-injected controls. Adrenalectomy did not prevent the loss in Cyp3a11 expression or activity, thereby precluding …

Probing Proteinase Active Sites Using Oriented Peptide Mixture Libraries – Adam-10, John L. Krstenansky, Jihong Wang, Gregg R. Chenail, Matthew R. Tiffany, Geoffrey M. Kuesters, Barbara C. Natke, John L. Nestor Jr.

Pharmaceutical Science and Research

Oriented Peptide Mixture Libraries can provide a full matrix of preferred and disfavored amino acids at each subsite of an optimal substrate for a new proteinase. This approach is rapid and convenient, requiring only two mixture libraries to complete the analysis. In this paper we demonstrate an extension of this type of analysis, using a focused library employing unnatural amino acids to probe the depth of the S1 position in the catalytic site of the alpha secretase ADAM-10. This analysis indicates that ADAM- 10 will accept amino acids with substantial length and hydrophobicity (e.g. 2- naphthylalanine), but suggests that the …

A Study Of 5-Aminolevulinic Acid And Its Methyl Ester Used In In Vitro And In Vivo Systems Of Human Bladder Cancer, Vanaja Manivasager, Paul Wan Sia Heng, Jinsong Hao, Wei Zheng, Khee Chee Soo, Malini Olivo

Pharmaceutical Science and Research

The use of 5-aminolevulinic acid and its esters to induce endogenous porphyrins for the purpose of detection of epithelial cancers is being studied extensively in many centres around the world. The challenge is to prepare an efficacious formulation for the purpose of cancer detection. Photodynamic diagnosis of cancer using 5-aminolevulinic acid (ALA) and its ester derivatives is being actively investigated. In this study, we compared ALA with ALA methyl ester (AME) derivative in terms of PpIX fluorescence intensity in in vitro and in vivo systems of bladder carcinoma. For the in vivo system consisting of RT112 xenografts, the modes of …

Macro-Microscopic Fluorescence Imaging Of Human Npc Xenografts In A Murine Model Using Topical Vs. Intravenous Administration Of 5-Aminolevulinic Acid, Vanaja Manivasager, Paul Wan Sia Heng, Jinsong Hao, Wei Zheng, Khee Chee Soo, Malini Olivo

Pharmaceutical Science and Research

The use of 5-aminolevulinic acid to induce endogenous porphyrins for the purpose of detection of epithelial cancers is being studied extensively in many centres around the world. The challenge is to prepare an efficacious formulation of 5-ALA for the purpose of cancer detection. In this study, we compared two formulations of topical 5-ALA applications with intravenous administration in NPC/CNE-2 xenografts on balb/c nude mice. One of the formulations was a gantrez muco-adhesive patch and the other was a polyvinyl-pyrolidone muco-adhesive patch. The Karl Storz fluorescence endoscopy system was used to obtain macroscopic fluorescence images. Microscopic fluorescence imaging was done by …

Antioxidation Activity Of Dhea And Its Mechanisms, Sun Yang, Han Rui

Pharmacy Faculty Articles and Research

Objective: The aim of this study was to determine the anti-oxidative activity of a new chemopreventive agent--dehydroepiandrosterone (DHEA), and the mechanisms of action by which DHEA protect the thymocytes and DNA from oxidative damage. Methods: Agarose gel electrophoresis, flow cytometry, single cel! gel electrophoresis, chemiluminescence assay, triazolyl blue tetrazolumbromide (MTT) colorimetry, and three dimensional collagen gel assay were used. Results: In agarose gel electrophoresis, 10 nmol/L DHEA blocked the typical DNA degradation (DNA Ladder) induced by H₂O₂. DHEA 2. 5 nmol/L and 10 nmol/L both significantly decreased the percentage of characteristic apoptotic DNA …

Ouabain Interaction With Cardiac Na+/K+-Atpase Initiates Signal Cascades Independent Of Changes In Intracellular Na+ And Ca2+, Jiang Liu, Jiang Tian, Michael Haas, Joseph I. Shapiro, Amir Askari, Zijian Xie

Pharmaceutical Science and Research

We have shown previously that partial inhibition of the cardiac myocyte Na⁺/K⁺-ATPase activates signal pathways that regulate myocyte growth and growth-related genes and that increases in intracellular Ca²⁺ concentration ([Ca²⁺]i) and reactive oxygen species (ROS) are two essential second messengers within these pathways. The aim of this work was to explore the relation between [Ca²⁺]i and ROS. When myocytes were in a Ca²⁺-free medium, ouabain caused no change in [Ca²⁺]i, but it increased ROS as it did when the cells were in …

Protein Adducts Of Iso[4]Levuglandin E2, A Product Of The Isoprostane Pathway, In Oxidized Low Density Lipoprotein, Robert G. Salomon, Wei Sha, Cynthia Brame, Kamaljit Kaur, Ganesamoorthy Subbanagounder, June O'Neil, Henry F. Hoff, L. Jackson Roberts Ii

Pharmacy Faculty Articles and Research

Levuglandin (LG) E₂, a cytotoxic seco prostanoic acid co-generated with prostaglandins by nonenzymatic rearrangements of the cyclooxygenase-derived endoperoxide, prostaglandin H₂, avidly binds to proteins. That LGE₂-protein adducts can also be generated nonenzymatically is demonstrated by their production during free radical-induced oxidation of low density lipoprotein (LDL). Like oxidized LDL, LGE₂-LDL, but not native LDL, undergoes receptor-mediated uptake and impaired processing by macrophage cells. Since radical-induced lipid oxidation produces isomers of prostaglandins, isoprostanes (isoPs), via endoperoxide intermediates, we postulated previously that a similar family of LG isomers, isoLGs, is cogenerated with isoPs. Now …

Intracellular Reactive Oxygen Species Mediate The Linkage Of Na+/K+-Atpase To Hypertrophy And Its Marker Genes In Cardiac Myocytes, Joseph I. Shapiro, Amir Askari, Zijian Xie, Peter Kometiani, Jie Li, Jiang Liu

Pharmaceutical Science and Research

We showed before that in cardiac myocytes partial inhibition of Na⁺/K⁺-ATPase by nontoxic concentrations of ouabain causes hypertrophy and transcriptional regulations of growth-related marker genes through multiple Ca²⁺-dependent signal pathways many of which involve Ras and p42/44 mitogen-activated protein kinases. The aim of this work was to explore the roles of intracellular reactive oxygen species (ROS) in these ouabain-initiated pathways. Ouabain caused a rapid generation of ROS within the myocytes that was prevented by preexposure of cells to N-acetylcysteine (NAC) or vitamin E. These antioxidants also blocked or attenuated the following actions of …

What Is The Risk Of Teratogenicity With The Use Of Selective Serotonin Reuptake Inhibitors During Pregnancy?, Michael Z. Wincor, Mary Gutierrez, Ann Nguyen

Pharmacy Faculty Articles and Research

"The lifetime prevalence of major depressive disorder in women is 10 to 25%, with an average age of onset in the mid-20s.1 Over the nine years that the selective serotonin reuptake inhibitors (SSRis) have been available, for many prescribers, they have become first-line agents in the treatment of depression. In addition, sorne of them are also being used in the treatment of obsessive- compulsive disorder and panic disorder. In light of these facts, itis not unlikely that women of childbearing age would be treated with one of the SSRis. In considering the risks of exposing a fetus to an SSRI, …

Meal Interference With Antibiotics Administered Orally In Kentucky Hospitals, Shirley Harper

Masters Theses & Specialist Projects

Hospitals within the State of Kentucky were surveyed to determine if the size of the hospitals influence the frequency of potential meal interference with the administration of oral antibiotics where the "empty stomach" concept must be fulfilled. One hundred and ten hospitals responded to the mailed survey. Of the responding hospitals 103 were short-term and 7 were long-term hospitals. The frequency of conflict was greater for nourishments than with meal interference. Ninety-three and six tenths percent or 103 answered yes when asked if all patients received nourishments on request. The conflicts of potential meal interference ranged from 15 to 40 …

The Pharmacology Of Rodenticides, S. A. Peoples

Proceedings of the 4th Vertebrate Pest Conference (1970)

The compounds used as rodenticides are tremendously varied in their chemical structure and mechanism of action. With a few exceptions, these agents are generally poisonous to all animals, including man, and a great deal of study has been directed to their toxicity in animals other than rodents. However, the development of new compounds as Norbormide and certain antifertility drugs which are highly selective in their action may justify the hope that the ideal rodenticide free of secondary toxic hazards will soon be available. Until this happy announcement is made, a review of the pharmacology of the older compounds is in …