Research Topics
Species | R VenkataramananSummaryAffiliation: University of Pittsburgh Country: USA Publications
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Publications
Troglitazone increases cytochrome P-450 3A protein and activity in primary cultures of human hepatocytesV Ramachandran
Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, USA
Drug Metab Dispos 27:1194-9. 1999..At concentrations of 25 microM and above, TRO was toxic to the cells, as determined by a decrease in the activity of CYP3A, a reduction in the amount of immunoreactive protein, and changes in the morphology of the cells...
Pharmacokinetics of tacrolimus and mycophenolic acid are altered, but recover at different times during hepatic regeneration in ratsHui Tian
718 Salk Hall, Department of Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, PA 15261, USA
Drug Metab Dispos 33:329-35. 2005..Caution must be exercised in extrapolating in vitro data to in vivo conditions during hepatic regeneration...
Milk thistle, a herbal supplement, decreases the activity of CYP3A4 and uridine diphosphoglucuronosyl transferase in human hepatocyte culturesR Venkataramanan
Department of Pharmaceutical Sciences School of Pharmacy, Pennsylvania, USA
Drug Metab Dispos 28:1270-3. 2000..Indiscriminate use of herbal products may lead to altered pharmacokinetics of certain drugs and may result in increased toxicity of certain drugs...
Long-term function and morphology of intestinal allografts in outbred canine transplantation modelK Iwanami
Surgery, Thomas E. Starzl Transplantation Institute, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA
Transplant Proc 34:994-5. 2002
Pharmacokinetics of mycophenolic acid after mycophenolate mofetil administration in liver transplant patients treated with tacrolimusA Jain
School of Pharmacy, University of Pittsburgh, Pennsylvania 15261, USA
J Clin Pharmacol 41:268-76. 2001..Changes in albumin appear to partially contribute to the variations in the pharmacokinetics of MPA in liver transplant patients...
Bioavailability and population pharmacokinetics of voriconazole in lung transplant recipientsK Han
University of Pittsburgh, Pittsburgh, Pennsylvania, USA
Antimicrob Agents Chemother 54:4424-31. 2010..However, voriconazole levels should be monitored, and the dose should be individualized based on trough concentrations as a good measure of drug exposure...
Species-dependent hepatic metabolism of immunosuppressive agent tacrolimus (FK-506)P N V Tata
Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, PA, USA
Xenobiotica 39:757-65. 2009..From the current in-vitro metabolism studies, the pattern of tacroliums metabolism in baboons closely resembled that in humans and thus it is ideal for studying tacroliums metabolism-related work of clinical relevance...
The role of conjugation in hepatotoxicity of troglitazone in human and porcine hepatocyte culturesV E Kostrubsky
University of Pittsburgh Medical Center, Department of Pathology, Pittsburgh, Pennsylvania, USA
Drug Metab Dispos 28:1192-7. 2000..These results suggest that inhibition of troglitazone sulfation may result in increased hepatotoxicity due to exposure to parent drug, or increased metabolism by alternate pathways...
Sirolimus for rescue and primary immunosuppression in transplanted children receiving tacrolimusR Sindhi
Thomas E Starzl Transplantation Institute, Children s Hospital of Pittsburgh, 3705 Fifth Avenue, Pittsburgh, Pennsylvania 15213, USA
Transplantation 72:851-5. 2001..Rescue indications for TAC toxicity were nephrotoxicity, pancreatitis, seizures, hypertrophic cardiomyopathy, and graft-versus-host disease...
Intestinal function and morphology after ex vivo irradiated small bowel transplantationT Ishikawa
Department of Surgery, Thomas E. Starzl Transplantation Institute, University of Pittsburgh Medical Center, Pittsburgh, PA 15213, USA
Transplant Proc 34:988-9. 2002
Disrupted bile acid homeostasis reveals an unexpected interaction among nuclear hormone receptors, transporters, and cytochrome P450E G Schuetz
Department of Pharmaceutical Sciences, St. Jude Children's Research Hospital, Memphis, Tennessee 38105, USA
J Biol Chem 276:39411-8. 2001....
The impact of conversion from prograf to generic tacrolimus in liver and kidney transplant recipients with stable graft functionJ D Momper
Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, PA, USA
Am J Transplant 11:1861-7. 2011..These results suggest that transplant patients currently taking the reference tacrolimus formulation may be safely switched to the Sandoz-generic product provided trough concentrations are closely monitored following the substitution...
Clinical utility of monitoring tacrolimus blood concentrations in liver transplant patientsR Venkataramanan
Department of Pharmaceutical Sciences, Pathology, and Surgery, University of Pittsburgh, Pennsylvania 15261, USA
J Clin Pharmacol 41:542-51. 2001....
Treprostinil, a prostacyclin analog, ameliorates ischemia-reperfusion injury in rat orthotopic liver transplantationN Ghonem
Department of Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, PA, USA
Am J Transplant 11:2508-16. 2011..Treprostinil protected the liver graft against IRI during OLT. Treprostinil has the potential to serve as a therapeutic option to protect the liver graft against I/R injury in patients undergoing OLT...
Voriconazole pharmacokinetics in liver transplant recipientsH J Johnson
University of Pittsburgh, Medical Center, Pittsburgh, PA 15232, USA
Antimicrob Agents Chemother 54:852-9. 2010..Given that trough voriconazole concentration is a good measure of drug exposure (AUC), the voriconazole dose can be individualized based on trough concentration measurements in liver transplant patients...
Pharmacodynamics of sirolimus in transplanted children receiving tacrolimusRakesh Sindhi
Pediatric Transplantation, Children's Hospital of Pittsburgh, 3705 Fifth Avenue, Pittsburgh, PA 15217, USA
Transplant Proc 34:1960. 2002
Interaction between tacrolimus and antiretroviral agents in human immunodeficiency virus-positive liver and kidney transplantation patientsA K B Jain
Thomas E. Starzl Transplantation Institute, University of Pittsburgh Medical Center, 3601 Fifth Avenue, Falk Medical Building 4th Floor, Pittsburgh, PA 15213, USA
Transplant Proc 34:1540-1. 2002
Aerosol deposition of lipid complex amphotericin-B (Abelcet) in lung transplant recipientsT E Corcoran
Division of Pulmonary, Allergy, and Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
Am J Transplant 6:2765-73. 2006..These studies provide an important precursor to studies of the efficacy of inhaled ABLC as a prophylaxis of invasive aspergillosis after lung transplant...
Traditional Chinese medicines Wu Wei Zi (Schisandra chinensis Baill) and Gan Cao (Glycyrrhiza uralensis Fisch) activate pregnane X receptor and increase warfarin clearance in ratsYing Mu
Center for Pharmacogenetics, University of Pittsburgh School of Pharmacy, Pittsburgh, PA, USA
J Pharmacol Exp Ther 316:1369-77. 2006..Meanwhile, the activation of PXR and induction of detoxifying enzymes provide a molecular mechanism for the hepatoprotective effects of certain TCMs...
Activity and expression of various isoforms of uridine diphosphate glucuronosyltransferase are differentially regulated during hepatic regeneration in ratsHui Tian
Department of Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, USA
Pharm Res 22:2007-15. 2005....
Replacing calcineurin inhibitors with mTOR inhibitors in childrenRakesh Sindhi
Children s Hospital of Pittsburgh and the University of Pittsburgh, Pittsburgh, PA 15217, USA
Pediatr Transplant 9:391-7. 2005..Improvement in renal function and hypertension management, and absence of sirolimus-related adverse events argue for prospective evaluation of regimens in which mTOR inhibitors are used without calcineurin inhibitors in children...
Intraindividual and interindividual variations in the pharmacokinetics of mycophenolic acid in liver transplant patientsJaya Pisupati
Department of Pharmaceutical Sciences and Pharmacy and Therapeutics, University of Pittsburgh School of Pharmacy, Pittsburgh, PA 15261, USA
J Clin Pharmacol 45:34-41. 2005..The observations in this study support the concept of measuring the unbound concentration of mycophenolic acid to optimize immunosuppressive drug therapy with mycophenolic acid...
In vitro and in vivo assessment of herb drug interactionsRaman Venkataramanan
Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh PA 15261, USA
Life Sci 78:2105-15. 2006..Further systematic studies are necessary to assess the significance of herb drug interactions...
MDR1 genotype is associated with hepatic cytochrome P450 3A4 basal and induction phenotypeJatinder Lamba
Department of Pharmaceutical Sciences, St Jude Children's Research Hospital, Memphis, TN 38105, USA
Clin Pharmacol Ther 79:325-38. 2006..Moreover, the influence of MDR1 genotype on CYP3A4 expression adds additional complexity to determining the relative contribution of the MDR1 alleles to the disposition of substrates shared by CYP3A4 and MDR1/P-glycoprotein...
Pharmacokinetics of mycophenolic acid in liver transplant patients after intravenous and oral administration of mycophenolate mofetilAshok Jain
Department of Surgery, Division of Transplantation, University of Rochester Medical Center, Rochester, NY 14642, USA
Liver Transpl 13:791-6. 2007..In conclusion, during the early postoperative period, LTx recipients have MPA exposure with oral MMF of less than half that of IV MMF. Use of IV MMF immediately post-LTx may provide an immunological advantage...
Novel single nucleotide polymorphisms in the promoter and intron 1 of human pregnane X receptor/NR1I2 and their association with CYP3A4 expressionJatinder Lamba
Department of Pharmaceutical Sciences, St Jude Children s Research Hospital, Memphis, Tennessee 38105, USA
Drug Metab Dispos 36:169-81. 2008....
Functional evolution of the vitamin D and pregnane X receptorsErica J Reschly
Department of Pathology, University of Pittsburgh, Pittsburgh, PA, USA
BMC Evol Biol 7:222. 2007..In addition, several assays were used to search for evidence of PXR-mediated hepatic effects in three model non-mammalian species: sea lamprey (Petromyzon marinus), zebrafish (Danio rerio), and African clawed frog (Xenopus laevis)...
Pharmacokinetics of mycophenolic acid in live donor liver transplant patients vs deceased donor liver transplant patientsAshok Jain
University of Rochester Medical Center, Department of Surgery, Division of Solid Organ Transplantation, Rochester, NY 14642, USA
J Clin Pharmacol 48:547-52. 2008..These observations point to the need to use a lower dosage (approximately 30%) of mycophenolate mofetil in live donor liver transplant patients compared with deceased donor liver transplant patients...
Pharmacokinetics of tacrolimus in living donor liver transplant and deceased donor liver transplant recipientsAshok Jain
Department of Surgery, Division of Solid Organ Transplant, University of Rochester Medical Center, Rochester, NY, USA
Transplantation 85:554-60. 2008..AIM.: The aim of the present study is to compare the dosage, concentration and pharmacokinetics parameters of tacrolimus between LDLT and deceased donor liver transplant (DDLT) recipients...
Phenytoin decreases the blood concentrations of sirolimus in a liver transplant recipient: a case reportJonathan A Fridell
Department of Surgery, Indiana University School of Medicine, Indianapolis, USA
Ther Drug Monit 25:117-9. 2003..It is essential to monitor the blood concentrations of sirolimus and adjust the sirolimus dosage when phenytoin administration begins or ends...
Lung deposition and pharmacokinetics of cyclosporine after aerosolization in lung transplant patientsGilbert J Burkart
Department of Pharmacy and Therapeutics, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, USA
Pharm Res 20:252-6. 2003..The objective of this study is to evaluate the lung deposition and systemic absorption of aCsA after aerosolized cyclosporine administration in LTx patients in the immediate postoperative period...
Coordinated intrahepatic and extrahepatic regulation of cytochrome p4502D6 in healthy subjects and in patients after liver transplantationJoseph A Carcillo
Department of Pediatrics, School of Medicine, University of Pittsburgh, Pittsburgh, PA 15261, USA
Clin Pharmacol Ther 73:456-67. 2003....
Morphology and function of canine small intestinal autografts: with particular interest in the influence of ex vivo graft irradiationTakashi Ishikawa
Thomas, E, Starzl Transplantation Institute, Department of Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA
J Gastrointest Surg 7:662-71. 2003..Graft irradiation did not induce further defects in intestinal function or cause histopathologic abnormalities...
The interaction between antiretroviral agents and tacrolimus in liver and kidney transplant patientsAshok Kumar B Jain
Department of Surgery, Thomas E Starzl Transplantation Institute, University of Pittsburgh Medical Center, Pittsburgh, PA 15213, USA
Liver Transpl 8:841-5. 2002..Great caution and frequent drug level monitoring are necessary when HAART is introduced or withdrawn in HIV-positive recipients of organ transplants...
Long-term function and morphology of intestinal autografts and allografts in outbred dogsKotaro Iwanami
Department of Surgery, Thomas E. Starzl Transplantation Institute, University of Pittsburgh Medical Center, Pittsburgh, PA, USA
Am J Transplant 3:1083-90. 2003..Results also indicate that these allografts experienced low-grade chronic rejection as evidenced in the submucosa and muscle layers, despite the lack of clinical symptoms...
Effect of coadministered lopinavir and ritonavir (Kaletra) on tacrolimus blood concentration in liver transplantation patientsAshokkumar B Jain
Department of Surgery, Division of Transplantation, Thomas E Starzl Transplantation Institute, University of Pittsburgh, Pittsburgh, PA, USA
Liver Transpl 9:954-60. 2003..Great caution is required in the management of tacrolimus dosage when Kaletra is introduced or withdrawn in HIV-positive patients after liver transplantation, particularly in the presence of hepatic dysfunction...
Pharmacokinetics of sirolimus and tacrolimus in pediatric transplant patientsMarika Schubert
Thomas E Starzl Transplantation Institute of the Children's Hospital of Pittsburgh, Pittsburgh, PA, USA
Am J Transplant 4:767-73. 2004..During conversion of subjects from TAC to combined TAC and SRL, aggressive therapeutic drug monitoring must be used to individualize therapy and avoid serous adverse events...
Sirolimus pharmacokinetic differences between children and adultsRaman Venkataramanan
Pediatr Transplant 10:872-4. 2006
Voriconazole inhibition of the metabolism of tacrolimus in a liver transplant recipient and in human liver microsomesRaman Venkataramanan
School of Pharmacy, University of Pittsburgh, and Veterans Affairs Medical Center, Pittsburgh, Pennsylvania 15240, USA
Antimicrob Agents Chemother 46:3091-3. 2002..Close monitoring of the blood concentration and adjustment in the dose of tacrolimus are warranted in transplant recipients treated with voriconazole...
Evaluation of renal function in transplant patients on tacrolimus therapySangeeta Agarwala
Department of Pharmaceutical Sciences and Pharmacy and Therapeutics, School of Pharmacy, University of Pittsburgh, Pennsylvania 15261, USA
J Clin Pharmacol 42:798-805. 2002..Dosage alterations ofrenally eliminated drugs may be required for drugs with a narrow therapeutic index...
Pharmacokinetics of cefoperazone and sulbactam in liver transplant patientsRobert R Muder
Department of Medicine, VA Medical Center, Pittsburgh, PA, USA
J Clin Pharmacol 42:644-50. 2002....
Ribavirin dose modification based on renal function is necessary to reduce hemolysis in liver transplant patients with hepatitis C virus infectionAshok B Jain
Transplantation Institute, The Department of Surgery, University of Pittsburgh, Pittsburgh, PA 15213, USA
Liver Transpl 8:1007-13. 2002..Further pharmacokinetic studies of ribavirin in LTx patients with varying degrees of renal function may allow the development of an algorithm for the safer use of ribavirin in HCV-positive LTx patients...
Identification of enzymes involved in the metabolism of 17alpha-hydroxyprogesterone caproate: an effective agent for prevention of preterm birthShringi Sharma
Department of Pharmaceutical Sciences, University of Pittsburgh School of Pharmacy, Pittsburgh, Pennsylvania 15261, USA
Drug Metab Dispos 36:1896-902. 2008..Because CYP3A is involved in the oxidative metabolism of numerous commonly used drugs, 17-OHPC may be involved in clinically relevant metabolic drug interactions with coadministered CYP3A inhibitors or inducers...
Induction and inhibition of cytochromes P450 by the St. John's wort constituent hyperforin in human hepatocyte culturesBernard J Komoroski
Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, PA 15261, USA
Drug Metab Dispos 32:512-8. 2004....
Nelfinavir, a protease inhibitor, increases sirolimus levels in a liver transplantation patient: a case reportAshok Kumar B Jain
Department of Surgery, University of Pennsylvania, Philadelphia, PA, USA
Liver Transpl 8:838-40. 2002..Increase in trough concentration, peak concentration area under the curve concentration, and prolongation of half-life of sirolimus has been shown in a patient who was on a low dose (one fifth the recommended dose) of nelfinavir...
Pharmacokinetic study of mycophenolic acid in Korean kidney transplant patientsEun Kyung Cho
Graduate School of Clinical Pharmacy, Sookmyung Women's University, 53-12 Chungpadong 2-ka, Yongsan-gu, Seoul, 140-742 Korea
J Clin Pharmacol 44:743-50. 2004..MPA concentrations of predose and 1- and 8-hour postdose were positively correlated with AUC...
Mycophenolic acid pharmacodynamics and pharmacokinetics provide a basis for rational monitoring strategiesLeslie M Shaw
Department of Pathology and Laboratory Medicine, School of Pharmacy, University of Pittsburgh, PA 15261, USA
Am J Transplant 3:534-42. 2003
An official ATS statement: hepatotoxicity of antituberculosis therapyJussi J Saukkonen
Am J Respir Crit Care Med 174:935-52. 2006..Priorities for future studies to develop safer treatments for LTBI and for TB disease are presented...
Intrapulmonary penetration of voriconazole in patients receiving an oral prophylactic regimenBlair Capitano
School of Pharmacy, University of Pittsburgh, 720 Salk Hall, 3501 Terrace St, Pittsburgh, PA 15261, USA
Antimicrob Agents Chemother 50:1878-80. 2006..The ELF concentrations exceeded those of the plasma, with an average ELF-to-plasma ratio of 11 (+/-8). A strong association between plasma and ELF concentrations (r(2) = 0.95) was noted...
Animal models of xenobiotic receptors in drug metabolism and diseasesHaibiao Gong
Center for Pharmacogenetics, University of Pittsburgh, Pennsylvania, USA
Methods Enzymol 400:598-618. 2005..quot;Humanized" hPXR transgenic mice represent a major step forward in the creation and utilization of humanized rodent models for toxicological assessment that may aid in the development of safer drugs...
Tacrolimus dosage requirements after initiation of azole antifungal therapy in pediatric thoracic organ transplantationC Becket Mahnke
Division of Cardiology, Children's Hospital of Pittsburgh, PA 15213, USA
Pediatr Transplant 7:474-8. 2003..An initial reduction in tacrolimus dose by one-third is insufficient, and dose reduction of at least 50% upon azole initiation seems warranted. Once azole antifungal therapy is initiated, frequent therapeutic drug monitoring is required...
Therapeutic monitoring of mycophenolic acid in liver transplant patientsRaman Venkataramanan
Liver Transpl 10:503-5. 2004
Effect of the St. John's wort constituent hyperforin on docetaxel metabolism by human hepatocyte culturesBernard J Komoroski
Department of Pharmaceutical Sciences, University of Pittsburgh School of Pharmacy, Pennsylvania 15213-1863, USA
Clin Cancer Res 11:6972-9. 2005..John's wort on a chronic basis. The results also show induction of previously undescribed metabolic pathways for docetaxel, one of which may be analogous to the known 6-alpha-hydroxylation of paclitaxel by CYP2C8...
Determination of 13-O-demethyl tacrolimus in human liver microsomal incubates using liquid chromatography-mass spectrometric assay (LC-MS)Yan Feng
Department of Pharmaceutical Sciences, School of Pharmacy, School of Medicine, University of Pittsburgh, Pittsburgh, PA 15261, USA
J Chromatogr B Analyt Technol Biomed Life Sci 821:31-7. 2005..6 to 9.6%. The limits of detection was 2 ng/ml. This assay has been used to evaluate the effect of three human immunodeficiency virus (HIV) protease inhibitors on the metabolism of tacrolimus in human liver microsomes...
A comprehensive in vitro and in silico analysis of antibiotics that activate pregnane X receptor and induce CYP3A4 in liver and intestineKazuto Yasuda
Department of Pharmaceutical Sciences, St Jude Children s Research Hospital, Memphis, Tennessee, USA
Drug Metab Dispos 36:1689-97. 2008..In summary, nafcillin, dicloxacillin, cephradine, tetracycline, sulfixoxazole, erythromycin, clindamycin, and griseofulvin exhibit a clear propensity to induce CYP3A4 and warrant further clinical investigation...
