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Species | Dion R BrocksSummaryAffiliation: University of Alberta Country: Canada Publications
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Publications
Stereoselective halofantrine and desbutylhalofantrine disposition in the rat: cardiac and plasma concentrations and plasma protein bindingDion R Brocks
Pharmaceutical Sciences, Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, AB, T6G 2N8, Canada
Biopharm Drug Dispos 23:9-15. 2002..In contrast, binding of HF enantiomers was non-stereoselective. The lower degree of stereoselectivity for DHF in heart tissues was attributable to its greater stereoselectivity in plasma protein binding...
Rate and extent of drug accumulation after multiple dosing revisitedDion R Brocks
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta T6G 2N8, Canada
Clin Pharmacokinet 49:421-38. 2010..In this article, drug accumulation is reviewed in a comprehensive manner, and the influences of the route of administration, nonlinear elimination and tissue concentrations are discussed...
Drug disposition in three dimensions: an update on stereoselectivity in pharmacokineticsDion R Brocks
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, AB, Canada
Biopharm Drug Dispos 27:387-406. 2006..In this review data from a number of representative studies involving pharmacokinetics of chiral drugs are presented and discussed...
The effect of increased lipoprotein levels on the pharmacokinetics of cyclosporine A in the laboratory ratDion R Brocks
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada
Biopharm Drug Dispos 27:7-16. 2006..In humans and rats the pharmacokinetics of CyA in the face of increased lipoprotein levels do not correspond well to what is typically seen for other drugs that are known to bind to lipoproteins...
A sensitive and specific high performance liquid chromatographic assay for milrinone in rat and human plasma using a commercially available internal standard and low sample volumeDion R Brocks
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada
J Pharm Pharm Sci 8:124-31. 2005..To develop an alternate high performance liquid chromatographic method (HPLC) for the analysis of the positive inotropic agent, milrinone, in rat and human plasma...
Stereoselectivity in the pharmacodynamics and pharmacokinetics of the chiral antimalarial drugsDion R Brocks
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada
Clin Pharmacokinet 42:1359-82. 2003..It is concluded that knowledge of the stereoselective aspects of these agents may be helpful in better understanding their mechanisms of action and possibly optimising their clinical safety and/or effectiveness...
Enhanced oral absorption of halofantrine enantiomers after encapsulation in a proliposomal formulationDion R Brocks
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Canada
J Pharm Pharmacol 54:1049-53. 2002..The ability of an encapsulated proliposomal product to significantly increase the oral absorption of HF was clearly demonstrated...
The influence of lipids on stereoselective pharmacokinetics of halofantrine: Important implications in food-effect studies involving drugs that bind to lipoproteinsDion R Brocks
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, AB Canada
J Pharm Sci 91:1817-26. 2002....
Development of a polymeric micellar formulation for valspodar and assessment of its pharmacokinetics in ratZiyad Binkhathlan
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada
Eur J Pharm Biopharm 75:90-5. 2010..27% versus 14.85%). Our results show that PEO-b-PCL micelles can efficiently solubilize valspodar and favorably modify its pharmacokinetic profile in rat after i.v. administration by decreasing the CL and Vd...
Induction of the NAD(P)H:quinone oxidoreductase 1 by ketoconazole and itraconazole: a mechanism of cancer chemoprotectionHesham M Korashy
Faculty of Pharmacy and Pharmaceutical Sciences, 3126 Dentistry Pharmacy Centre, University of Alberta, Edmonton, Alberta, Canada
Cancer Lett 258:135-43. 2007..This study provides the first evidence for the ability of KTZ and ITZ to induce the Nqo1 gene expression through an AhR-dependent mechanism...
An analytical method for cyclosporine using liquid chromatography-mass spectrometrySrividya V Kanduru
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada
Biomed Chromatogr 24:148-53. 2010..The reported assay method displayed high measures of linearity, sensitivity, reliability and precision, allowing its applicability in pharmacokinetic studies in rat...
The effect of beta-naphthoflavone on the metabolism of amiodarone by hepatic and extra-hepatic microsomesMarwa E Elsherbiny
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada T6G 2N8
Toxicol Lett 195:147-54. 2010..Amiodarone treatment did not affect basal or induced CYP1A activity...
Effects of intestinal constituents and lipids on intestinal formation and pharmacokinetics of desethylamiodarone formed from amiodaroneAnooshirvan Shayeganpour
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Alberta, Canada
J Pharm Pharmacol 60:1625-32. 2008....
The stereoselective metabolism of halofantrine to desbutylhalofantrine in the rat: evidence of tissue-specific enantioselectivity in microsomal metabolismNegar Gharavi
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada
Chirality 19:22-33. 2007..In vivo, oral (+/-)-KTZ caused significant increases in plasma halofantrine and decreases in DHF enantiomer plasma concentrations...
Nonlinear stereoselective pharmacokinetics of ketoconazole in rat after administration of racemateDalia A Hamdy
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada
Chirality 21:704-12. 2009..Stereoselectivity in KTZ pharmacokinetics is attributable to plasma protein binding, although other processes such as transport or intestinal metabolism may also contribute...
Effect of bile and lipids on the stereoselective metabolism of halofantrine by rat everted-intestinal sacsJigar P Patel
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada
Chirality 22:275-83. 2010..The results were consistent with previous in vivo evaluations showing that the desbutylhalofantrine to halofantrine ratio was decreased by the ingestion of a high fat meal...
Pharmacokinetics of desethylamiodarone in the rat after its administration as the preformed metabolite, and after administration of amiodaroneAnooshirvan Shayeganpour
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada
Biopharm Drug Dispos 29:159-66. 2008..Amiodarone and DEA differed in their pharmacokinetic characteristics mostly due to a higher CL of DEA. With oral dosing, AM appeared to undergo significant presystemic first-pass metabolism within the intestinal tract...
Effect of gastric bypass surgery on azithromycin oral bioavailabilityRaj S Padwal
Department of Medicine, University of Alberta, Edmonton, Alberta, Canada
J Antimicrob Chemother 67:2203-6. 2012..Gastric bypass, a procedure that circumvents the upper gut, may compromise azithromycin plasma levels. We hypothesized that azithromycin concentrations would be reduced following gastric bypass...
Encapsulation of P-glycoprotein inhibitors by polymeric micelles can reduce their pharmacokinetic interactions with doxorubicinZiyad Binkhathlan
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, AB, Canada
Eur J Pharm Biopharm 81:142-8. 2012..In conclusion, encapsulation of cyclosporines, particularly valspodar, in polymeric micelles was shown to reduce their effects on the pharmacokinetics of DOX in rat...
Characterization of the self assembly of methoxy poly(ethylene oxide)-block-poly(α-benzyl carboxylate-ε-caprolactone) for the solubilization and in vivo delivery of valspodarZiyad Binkhathlan
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta T6G 2N8, Canada
Curr Drug Deliv 9:164-71. 2012..In conclusion, the results show a potential for PEO-b-PBCL nanocarriers as efficient solubilizing agents for delivery of valspodar...
The impact of experimental hyperlipidemia on the distribution and metabolism of amiodarone in ratAnooshirvan Shayeganpour
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada T6G 2N8
Int J Pharm 361:78-86. 2008..This experimental hyperlipidemia caused a complex pattern of changes in tissue distribution of AM. In addition, there are decreases in the expression of some important rat CYP isoenzymes...
The effect of oral lipids and circulating lipoproteins on the metabolism of drugsJigar P Patel
University of Alberta, Dentistry Pharmacy Centre, Edmonton, Canada
Expert Opin Drug Metab Toxicol 5:1385-98. 2009..The components of lipoproteins may also modulate the expression or activity of hepatic and extrahepatic drug metabolizing enzymes...
Disposition of drugs in block copolymer micelle delivery systems: from discovery to recoveryHamidreza Montazeri Aliabadi
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada
Clin Pharmacokinet 47:619-34. 2008....
The effect of CYP1A induction on amiodarone disposition in the ratMarwa E Elsherbiny
Faculty of Pharmacy and Pharmaceutical Sciences, 3118 Dentistry Pharmacy Centre, University of Alberta, Edmonton, Alberta, Canada
J Pharm Sci 99:539-48. 2010..9-, 2.5-, 3.8-, 3.4-, and 2.7-fold, respectively. In both groups of rats, the highest concentrations of AM and DEA were in the lung. Exposure to BNF was shown to increase DEA concentrations in the rat...
The effect of experimental hyperlipidemia on the stereoselective tissue distribution, lipoprotein association and microsomal metabolism of (+/-)-halofantrineJigar P Patel
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada
J Pharm Sci 98:2516-28. 2009..It would appear that both reduced plasma unbound fraction and lipoprotein associated directed uptake of lipoprotein-bound drug by tissues play roles in enantiomer biodistribution...
The influence of hyperlipoproteinemia on in vitro distribution of amiodarone and desethylamiodarone in human and rat plasmaAnooshirvan Shayeganpour
Faculty of Pharmacy and Pharmaceutical Sciences, 3118 Dentistry Pharmacy Centre, University of Alberta, Edmonton, AB, Canada
Pharm Res 24:672-8. 2007..To study the effect of hyperlipoproteinemia on in vitro distribution of amiodarone (AM) and its prevalent metabolite desethylamiodarone (DEA) in human and rat plasma...
Determination of the enzyme(s) involved in the metabolism of amiodarone in liver and intestine of rat: the contribution of cytochrome P450 3A isoformsAnooshirvan Shayeganpour
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Canada T6G 2N8
Drug Metab Dispos 34:43-50. 2006..v. treated rats. Although low to undetectable concentrations of DEA were a limitation for determination of AUC of DEA in vivo, it was confirmed that ketoconazole could cause a significant increase in AM concentrations in rat...
The effect of increased lipoprotein levels on the pharmacokinetics of ketoconazole enantiomers in the ratDalia A Hamdy
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada
Xenobiotica 41:137-43. 2011..In conclusion, HL caused an increase in V(ss), and possibly decreased liver uptake of the more potent CYP-inhibiting (-) enantiomer...
Effect of hyperlipidemia on ketoconazole-midazolam drug-drug interaction in ratDalia A Hamdy
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta T6G 2N8, Canada
J Pharm Sci 100:4986-92. 2011..HL caused a more pronounced KTZ-associated inhibition of MDZ CL. This may be related to the decrease of MDZ's unbound fraction and perhaps to attenuation of CYP3A by HL in the rat...
Polymeric micelles for the solubilization and delivery of cyclosporine A: pharmacokinetics and biodistributionHamidreza Montazeri Aliabadi
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, AB, Canada T6G 2N8
Biomaterials 26:7251-9. 2005..Our results show that PEO-b-PCL micelles can effectively solubilize CsA, at the same time confining CsA to the blood circulation and restricting its access to tissues such as kidney, perhaps limiting the onset of toxicity...
A liquid chromatography-mass spectrometry assay method for simultaneous determination of amiodarone and desethylamiodarone in rat specimensAnooshirvan Shayeganpour
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada T6G 2N8
Biomed Chromatogr 21:284-90. 2007..The method was successfully used to measure tissue and plasma concentrations of drug. The validated lower limit of quantitation was 2.5 ng/mL for drug and metabolite, based on 0.1 mL of plasma...
Insights into the effects of hyperlipoproteinemia on cyclosporine A biodistribution and relationship to renal functionHamidreza Montazeri Aliabadi
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta T6G 2N8, Canada
AAPS J 8:E672-81. 2006....
High-performance liquid chromatography analysis of curcumin in rat plasma: application to pharmacokinetics of polymeric micellar formulation of curcuminZengshuan Ma
University of Alberta, Edmonton, Alberta, Canada T6G 2N8
Biomed Chromatogr 21:546-52. 2007..It was found that polymeric micelles increased the half-life of curcumin 162-fold that of solubilized curcumin and increased the volume of distribution (Vd(ss)) by 70-fold...
A novel use of an in vitro method to predict the in vivo stability of block copolymer based nano-containersHamidreza Montazeri Aliabadi
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada
J Control Release 122:63-70. 2007..PEO-b-PCL micelles containing higher CyA-loaded levels are shown to be more stable changing the pharmacokinetics of the encapsulated CyA to a higher extent...
Polymeric micellar delivery reduces kidney distribution and nephrotoxic effects of Cyclosporine A after multiple dosingHamidreza Montazeri Aliabadi
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta T6G 2N8, Canada
J Pharm Sci 97:1916-26. 2008..Compared to Sandimmune, polymeric micelles reduced kidney uptake of CyA by 2.6-fold, and increased CyA levels in blood by 2.1-fold. The results show a potential for PEO-b-PCL micelles in restricting the nephrotoxicity of CyA...
A stereospecific high-performance liquid chromatographic assay for the determination of ketoconazole enantiomers in rat plasmaDalia A Hamdy
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada
Biomed Chromatogr 22:542-7. 2008..In rats, plasma concentrations of (+)-KTZ were higher than those of antipode after single oral doses. The assay was shown to be sensitive and appropriate for use in pharmacokinetics study of KTZ in rat...
The metabolism of amiodarone by various CYP isoenzymes of human and rat, and the inhibitory influence of ketoconazoleMarwa E Elsherbiny
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta
J Pharm Pharm Sci 11:147-59. 2008..To evaluate the metabolism of amiodarone (AM) to desethylamiodarone (DEA) by selected human and rat cytochrome P450, and the inhibitory effect of ketoconazole (KTZ)...
The ability of polycyclic aromatic hydrocarbons to alter physiological factors underlying drug dispositionMarwa E Elsherbiny
Department of Oncology, University of Alberta, Cross Cancer Institute, Canada
Drug Metab Rev 43:457-75. 2011..In this article, the pharmacokinetic properties of PAH, the possible mechanisms by which they can alter drug disposition, and specific examples are discussed...
A liquid chromatography-mass spectrometry method for nicotine and cotinine; utility in screening tobacco exposure in patients taking amiodaroneRaniah Q Gabr
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Canada
Biomed Chromatogr 25:1124-31. 2011..The method was highly specific, sensitive and applicable as a tool in detecting and monitoring the passive exposure to tobacco smoke using small specimen volumes (0.1 mL)...
Effect of gastric bypass surgery on the absorption and bioavailability of metforminRaj S Padwal
Department of Medicine, University of Alberta, Edmonton, Alberta, Canada
Diabetes Care 34:1295-300. 2011..Metformin, the first-line drug for diabetes, has low bioavailability and slow, incomplete gastrointestinal absorption. We hypothesized that gastric bypass would further reduce the absorption and bioavailability of metformin...
Development of a liquid chromatography-mass spectrometry (LC/MS) assay method for the quantification of PSC 833 (Valspodar) in rat plasmaZiyad Binkhathlan
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada
J Chromatogr B Analyt Technol Biomed Life Sci 869:31-7. 2008..PSC 833 and IS eluted within 4 min, free of interfering peaks. The method was found to be fast, sensitive, and specific for the quantification of PSC 833 in rat plasma...
High performance liquid chromatographic assay for the simultaneous determination of midazolam and ketoconazole in plasmaDalia A Hamdy
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada
J Pharm Biomed Anal 53:617-22. 2010..5h, respectively. In conclusion, the assay was shown to be rapid, sensitive and appropriate for use in drug-drug interaction studies involving MDZ and KTZ in rat, and potentially in humans...
Induction of cytochrome P450 1A1 by ketoconazole and itraconazole but not fluconazole in murine and human hepatoma cell linesHesham M Korashy
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada T6G 2N8
Toxicol Sci 97:32-43. 2007..This study provides the first evidence for the ability of KTZ and ITZ to induce the CYP1A1 gene expression through an AhR-dependent mechanism, and suggests a novel mechanism of the KTZ- and ITZ-mediated toxicities...
Pharmacokinetics of Amiodarone in hyperlipidemic and simulated high fat-meal rat modelsAnooshirvan Shayeganpour
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada
Biopharm Drug Dispos 26:249-57. 2005....
Assessment of the inactivation potential of desethylamiodarone on human CYP1A1Marwa E Elsherbiny
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada T6G 2N8
Drug Metab Lett 4:9-14. 2010..1 microM and 9.6 microM, respectively) of CYP1A1 by desethylamiodarone. NADPH addition and/or replenishment were found to be important factors in determining the control activity in inactivation studies...
Pharmacokinetic characterization of intravenous cyclosporine treatment for cardioprotection during resuscitation of asphyxiated newborn pigletsRichdeep S Gill
Department of Surgery, University of Alberta, Edmonton, Alberta, Canada
Pediatr Crit Care Med 14:e156-62. 2013..We aimed to assess the pharmacokinetics of a single intravenous cyclosporine treatment during resuscitation of asphyxiated newborn piglets and compare these parameters with healthy newborn piglets...
Metformin and exercise in type 2 diabetes: examining treatment modality interactionsNormand G Boule
Faculty of Physical Education and Recreation, Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Canada
Diabetes Care 34:1469-74. 2011....
Effect of experimental hyperlipidaemia on the electrocardiographic effects of repeated doses of halofantrine in ratsJigar P Patel
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada
Br J Pharmacol 161:1427-40. 2010..Hyperlipidaemia elevates plasma concentration of halofantrine and may influence its tissue uptake. The present study examined the effect of experimental hyperlipidaemia on QT interval prolongation induced by halofantrine in rats...
Experimental hyperlipidemia causes an increase in the electrocardiographic changes associated with amiodaroneDalia A Hamdy
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada
J Cardiovasc Pharmacol 53:1-8. 2009..The cholesterol to triglyceride plasma ratio was linearly related to QT interval and plasma and heart AM concentrations. HL increased the ECG effects of AM by increasing heart concentrations...
Effect of rat serum lipoproteins on mRNA levels and amiodarone metabolism by cultured primary rat hepatocytesDion R Brocks
University of Alberta, Edmonton, Alberta, Canada
J Pharm Sci 102:262-70. 2013..When coincubated with serum, an additional effect of increased binding to lipoproteins seemed to further contribute to a reduced CL of AM...
The effects of gastric bypass surgery on drug absorption and pharmacokineticsDion R Brocks
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada
Expert Opin Drug Metab Toxicol 8:1505-19. 2012..Drugs will differ in their pharmacokinetic response to surgery, limiting any general conclusions regarding the impact of the surgery on drug disposition...
Cyclosporine treatment reduces oxygen free radical generation and oxidative stress in the brain of hypoxia-reoxygenated newborn pigletsRichdeep S Gill
Department of Surgery, University of Alberta, Edmonton, Alberta, Canada
PLoS ONE 7:e40471. 2012..Conclusively, post-resuscitation administration of cyclosporine significantly attenuates H(2)O(2) production and minimizes oxidative stress in newborn piglets following hypoxia-reoxygenation...
Development of a sensitive and specific liquid chromatography/mass spectrometry method for the quantification of cucurbitacin I (JSI-124) in rat plasmaOmmoleila Molavi
Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada
J Pharm Pharm Sci 9:158-64. 2006..CONCLUSION: The developed assay is sensitive, specific, reproducible and reliable for quantitative analysis of cucurbitacin I. Application in a pharmacokinetic assessment was proven in the rats given the drug...
Determination of metformin in human plasma and urine by high-performance liquid chromatography using small sample volume and conventional octadecyl silane columnRaniah Q Gabr
University of Alberta, Edmonton, AB Canada
J Pharm Pharm Sci 13:486-94. 2010..To develop a selective and sensitive high-performance liquid chromatographic method for the determination of metformin in human plasma and urine, using a conventional reverse phase column and low specimen volume...
Impact of stereoselectivity on the pharmacokinetics and pharmacodynamics of antiarrhythmic drugsReza Mehvar
School of Pharmacy, Texas Tech University Health Sciences Center, 1300 Coulter, Amarillo, TX 79106, USA
Clin Pharmacokinet 41:533-58. 2002..Because the effects of these drugs are related to their plasma concentrations, this information is of special clinical relevance...
Metabolic acidosis: separation methods and biological relevance of organic acids and lactic acid enantiomersJulia B Ewaschuk
College of Pharmacy and Nutrition, University of Saskatchewan, 110 Science Place, Saskatoon, Saskatchewan S7N 5C9, Canada
J Chromatogr B Analyt Technol Biomed Life Sci 781:39-56. 2002..Sample preparation techniques developed for these analytes are also discussed...
Impact of lipoproteins on the biological activity and disposition of hydrophobic drugs: implications for drug discoveryKishor M Wasan
Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, Canada V6T 1Z3
Nat Rev Drug Discov 7:84-99. 2008....
