2008
Ethyl pyruvate reduces germ cell–specific apoptosis and oxidative stress in rat model of testicular torsion/detorsion
Payabvash S, Kiumehr S, Tavangar SM, Dehpour AR. Ethyl pyruvate reduces germ cell–specific apoptosis and oxidative stress in rat model of testicular torsion/detorsion. Journal Of Pediatric Surgery 2008, 43: 705-712. PMID: 18405719, DOI: 10.1016/j.jpedsurg.2007.12.063.Peer-Reviewed Original ResearchConceptsEthyl pyruvate solutionRinger's ethyl pyruvate solutionProtective effectRight testisTissue damageMPO activityTesticular torsionGroup 2Sperm countGerm cell apoptosis indicesLong-term testicular functionTesticular torsion/detorsionGerm cell-specific apoptosisLipid peroxidationApoptotic tissue damageTestis tissue damageTorsion/detorsionGroup 2 ratsAnti-inflammatory propertiesSprague-Dawley ratsGroup 24 hoursEpididymal sperm concentrationEthyl pyruvateCell apoptosis indexPyruvate solution
2007
Salutary Effects of N-Acetylcysteine on Apoptotic Damage in a Rat Model of Testicular Torsion
Payabvash S, Salmasi AH, Kiumehr S, Tavangar SM, Nourbakhsh B, Faghihi SH, Dehpour AR. Salutary Effects of N-Acetylcysteine on Apoptotic Damage in a Rat Model of Testicular Torsion. Urologia Internationalis 2007, 79: 248-254. PMID: 17940358, DOI: 10.1159/000107958.Peer-Reviewed Original ResearchConceptsAdministration of NACGerm cell apoptosis indicesIschemia/reperfusion injuryTorsion/detorsionCell apoptosis indexRat modelN-acetylcysteineApoptosis indexReperfusion injuryTesticular torsionProtective effectGroup 2Control groupTesticular torsion/detorsionNAC 30 minRenal tissue damageSprague-Dawley ratsGroup 1 animalsGerm cell apoptosisIntraperitoneal injectionSham operationSaline injectionSystemic administrationTherapeutic doseAntioxidant balanceEndogenous opioids modulate hepatocyte apoptosis in a rat model of chronic cholestasis: the role of oxidative stress
Payabvash S, Kiumehr S, Nezami BG, Zandieh A, Anvari P, Tavangar SM, Dehpour AR. Endogenous opioids modulate hepatocyte apoptosis in a rat model of chronic cholestasis: the role of oxidative stress. Liver International 2007, 27: 538-547. PMID: 17403194, DOI: 10.1111/j.1478-3231.2007.01457.x.Peer-Reviewed Original ResearchConceptsAnti-oxidant balanceBile duct ligationChronic cholestasisEndogenous opioidsCholestatic ratsHepatocyte apoptosisOpioid antagonistRat modelHepatic lipid peroxidation levelsSerum liver enzymesCholestatic liver diseaseEndogenous opioid systemHepatic glutathione levelsAnti-oxidant defensesLipid peroxidation levelsAnti-oxidant enzyme activitiesChronic treatmentNaltrexone treatmentCholestatic animalsLiver diseaseBDL ratsHepatic damageDuct ligationLiver enzymesCholestasis
2006
Nitric oxide modulates glutathione synthesis during endotoxemia
Payabvash S, Ghahremani MH, Goliaei A, Mandegary A, Shafaroodi H, Amanlou M, Dehpour AR. Nitric oxide modulates glutathione synthesis during endotoxemia. Free Radical Biology And Medicine 2006, 41: 1817-1828. PMID: 17157184, DOI: 10.1016/j.freeradbiomed.2006.09.010.Peer-Reviewed Original ResearchConceptsNitric oxide synthesisOxide synthesisHepatic glutathione synthesisGlutathione levelsGlutathione synthesisInjection of lipopolysaccharideHepatic glutathione concentrationHepatic glutathione levelsEndotoxin-induced changesNitric oxide formationIntracellular glutathione levelsEndotoxemic miceLiver glutathioneEndotoxemiaNitric oxideGlutathione peroxidaseGlutathione fluxOxidative stressGlutathione concentrationGlutathione statusAntioxidant defenseGlutathione S-transferaseCysteine precursorLipopolysaccharideGlutathione metabolismChronic morphine treatment induces oxidant and apoptotic damage in the mice liver
Payabvash S, Beheshtian A, Salmasi AH, Kiumehr S, Ghahremani MH, Tavangar SM, Sabzevari O, Dehpour AR. Chronic morphine treatment induces oxidant and apoptotic damage in the mice liver. Life Sciences 2006, 79: 972-980. PMID: 16750225, DOI: 10.1016/j.lfs.2006.05.008.Peer-Reviewed Original ResearchConceptsChronic morphine treatmentMorphine treatmentMorphine administrationHigh dosesInduction of apoptosisInduction of liverHepatic glutathione concentrationAntioxidant defenseLiver antioxidant defensesObserved adverse effectsPro-oxidant effectsCancer painEnzymatic antioxidant defensesOpioid analgesicsChronic painOpioid drugsTumor spreadOpioid receptorsSame dosesHepatotoxic effectsProtective roleTumor growthLow dosesMorphineHepatocyte apoptosisNaltrexone, an opioid receptor antagonist, attenuates liver fibrosis in bile duct ligated rats
Ebrahimkhani MR, Kiani S, Oakley F, Kendall T, Shariftabrizi A, Tavangar SM, Moezi L, Payabvash S, Karoon A, Hoseininik H, Mann DA, Moore KP, Mani AR, Dehpour AR. Naltrexone, an opioid receptor antagonist, attenuates liver fibrosis in bile duct ligated rats. Gut 2006, 55: 1606. PMID: 16543289, PMCID: PMC1860108, DOI: 10.1136/gut.2005.076778.Peer-Reviewed Original ResearchConceptsHepatic stellate cellsProcollagen I expressionHepatic fibrosisBile ductSelective delta-opioid receptor agonistI expressionDelta-opioid receptor agonistAlpha-smooth muscle actinCultured hepatic stellate cellsOpioid receptor antagonistHepatic hydroxyproline levelsEffects of naltrexoneOpioid receptor agonistsHepatic GSH/GSSG ratioReverse transcriptase-polymerase chain reactionTIMP-1 expressionRat hepatic stellate cellsMMP-2 activityTranscriptase-polymerase chain reactionSmooth muscle actinMatrix metalloproteinase-2GSH/GSSG ratioDelta1 receptorsActivated Rat Hepatic Stellate CellsBiliary cirrhosisOpioid system blockade decreases collagenase activity and improves liver injury in a rat model of cholestasis
Kiani S, Ebrahimkhani MR, Shariftabrizi A, Doratotaj B, Payabvash S, Riazi K, Dehghani M, Honar H, Karoon A, Amanlou M, Tavangar SM, Dehpour AR. Opioid system blockade decreases collagenase activity and improves liver injury in a rat model of cholestasis. Journal Of Gastroenterology And Hepatology 2006, 22: 406-413. PMID: 17295775, DOI: 10.1111/j.1440-1746.2006.04260.x.Peer-Reviewed Original ResearchConceptsOpioid receptor blockadeLiver injuryMMP-2 activityNaltrexone treatmentReceptor blockadeCholestasis-induced liver injuryPlasma nitrite/nitrateNitrite/nitrate levelsMatrix metalloproteinase-2 activitySAH ratioManifestation of cholestasisOpioid agonist administrationSham-operated ratsMetalloproteinase-2 activityLiver enzyme activitiesNitrite/nitrateLiver SAM levelsPlasma enzyme activitiesSAM levelsAgonist administrationBDL animalsCholestatic animalsEndogenous opioidsBDL ratsS-adenosylhomocysteine content
2005
Effect of morphine on ischemia-reperfusion injury: Experimental study in testicular torsion rat model
Salmasi AH, Beheshtian A, Payabvash S, Demehri S, Ebrahimkhani MR, Karimzadegan M, Bahadori M, Pasalar P, Dehpour AR. Effect of morphine on ischemia-reperfusion injury: Experimental study in testicular torsion rat model. Urology 2005, 66: 1338-1342. PMID: 16360480, DOI: 10.1016/j.urology.2005.06.101.Peer-Reviewed Original ResearchConceptsMorphine groupEffects of morphineTesticular torsionD groupMorphine sulfateBaseline groupMalondialdehyde levelsRight testis 720 degreesAdult male Sprague-DawleyBasal normal valuesHours of detorsionIntravenous morphine sulfateIschemia-reperfusion injurySham-operated groupTesticular malondialdehyde levelsUnilateral testicular torsionMale Sprague-DawleySimilar histopathologic changesNaltrexone groupReperfusion injuryReperfusion phaseHistopathologic changesOpioid receptorsTesticular ischemiaIpsilateral testisParadoxical dose- and time-dependent regulation of superoxide dismutase and antioxidant capacity by vitamin E in rat
Golestani A, Rastegar R, Shariftabrizi A, Khaghani S, Payabvash SM, Salmasi AH, Dehpour AR, Pasalar P. Paradoxical dose- and time-dependent regulation of superoxide dismutase and antioxidant capacity by vitamin E in rat. Clinica Chimica Acta 2005, 365: 153-159. PMID: 16183047, DOI: 10.1016/j.cca.2005.08.008.Peer-Reviewed Original ResearchConceptsDosing groupVitamin ESOD activityAntioxidant capacitySignificant decreaseErythrocyte SOD activityPlasma antioxidant capacityVitamin E/Significant increaseEndogenous antioxidant systemNon-toxic dosesDose-dependent mannerTotal antioxidant capacitySerum levelsSame dosesBody weightNontoxic dosesWeeksControl levelsTime-dependent regulationAntioxidant defenseDosesSuperoxide dismutaseRatsAntioxidant systemHomocysteine alterations in experimental cholestasis and its subsequent cirrhosis
Ebrahimkhani MR, Sadeghipour H, Dehghani M, Kiani S, Payabvash S, Riazi K, Honar H, Pasalar P, Mirazi N, Amanlou M, Farsam H, Dehpour AR. Homocysteine alterations in experimental cholestasis and its subsequent cirrhosis. Life Sciences 2005, 76: 2497-2512. PMID: 15763080, DOI: 10.1016/j.lfs.2004.12.009.Peer-Reviewed Original ResearchConceptsBile duct ligationChronic L-NAME treatmentL-NAME treatmentPlasma Hcy concentrationPlasma HcyDuct ligationBiliary cirrhosisBDL ratsHcy concentrationsSAH ratioNitric oxideSecondary biliary cirrhosisWeeks of cholestasisImpaired liver functionModel of cirrhosisHcy elevationMethionine overloadPrecirrhotic stageSubsequent cirrhosisLiver functionObstructive cholestasisHepatic fibrogenesisHcy metabolismUnoperated ratsCholestasis