【摘要】目的探讨钙离子通道阻断剂尼莫地平调控烧伤后枯否细胞(KC)合成释放TNFα的可能性,为寻找到"> 【摘要】目的探讨钙离子通道阻断剂尼莫地平调控烧伤后枯否细胞(KC)合成释放TNFα的可能性,为寻找到" />
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大小:30.00 KB
页数:8页
时间:2019-05-24
《尼莫地平抑制大鼠烧伤后枯否细胞TNFα的产生》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、尼莫地平抑制大鼠烧伤后枯否细胞TNFα的产生【关键词】烧伤尼莫地平枯否细胞肿瘤坏死因子【摘要】目的探讨钙离子通道阻断剂尼莫地平调控烧伤后枯否细胞(KC)合成释放TNFα的可能性,为寻找到一种有效减轻、控制烧伤后过度全身炎症反应的措施提供理论依据。方法内灌注消化、密度梯度离心法分离培养正常SD大鼠KC,显微荧光分光光度计复合倒置显微镜技术观察烫伤血清作用下单个KC细胞内钙([Ca2+]i)变化,ELISA方法测定烫伤血清培养的KC上清中TNFα浓度变化;SD大鼠行30%TBSAⅢ度烫伤,
2、伤后6h分离KC,RNA酶保护分析法测定KCTNFαmRNA表达量,并测定血浆TNFα水平;观察尼莫地平存在时,上述结果的改变。结果与对照组相比,烧伤组KC[Ca2+]i峰值及培养上清中TNFα浓度增加值均显著增加(P<0.01),在1μM尼莫地平存在时,两者均显著减少(P<0.01)。烧伤后6hKCTNFαmRNA表达量及血浆TNFα水平显著升高,静脉给予尼莫地平(40μg?kg-1?h-1)后,两者均显著减少(P<0.01)。结论烧伤后,KC合成释放TNFα,通过细胞内钙离子通道信号传导途径实现。尼莫地平能抑制烧伤后KCTNFαmRN
3、A表达,使KC产生TNFα明显减少,并下调血浆中TNFα的总体水平。关键词烧伤尼莫地平枯否细胞肿瘤坏死因子αNimodipinecaninhibittheproductionofTNFαbykupffercellsinsevereburnedratsWangGuangyi,TianJianguang,ZhuShihui,etal.4、">BurnDepartment,ChanghaiHospital,Shanghai200433.【Abstract】ObjectiveTostudywhethernimodipine,aDihydropyridine-typecalciumchannelblocker,caninhibittheproductionofTNFαbykupffercells(KC)anddown-regulateitslevelofplasmaaftersevereburninjury.MethodsK5、Csofnormalratswereisolatedwithportalveincatheter,intrahepaticdigestionanddensitygradientcenˉtrifugation.Intracellularcalciumconcentration([Ca2+]i)inindividualKCafterstimulatedwithpostburnserumwasasˉsessedfluorometricallywithmicrospectrofluorometer.LevelofTNFαinthesupernat6、antofKCculturedwithpostburnserumwasdetectedbyELISA.SDratsunderwent30%TBSAfullthicknessburn.Sixhourslater,KCwereisolatedandtheirtotalRNAwasextracted.LevelofTNFαmRNAwasdetectedbyribonucleaseprotectionassay.LevelofplasmaTNFαwasalsodetected.Roleofnimodipineonabove-mentionedef7、fectswereobserved.ResultsComparedwiththatofcontrolgroup,[Ca2+]iofKCandlevelofTNFαinsupernatantinburngroupincreasedsignificantly.Atpresentof1μMnimodipine,however,thenumericalvaluedecreasedsignificantly.Comparedwiththatofcontrolgroup,levelofKCmRNAandplasmaTNFαinburngroupals8、oincreasedsignificantly.Afterintravenouslyinjectionwithnimodipine(40μg?kg-1?h-1),thenumericalval
4、">BurnDepartment,ChanghaiHospital,Shanghai200433.【Abstract】ObjectiveTostudywhethernimodipine,aDihydropyridine-typecalciumchannelblocker,caninhibittheproductionofTNFαbykupffercells(KC)anddown-regulateitslevelofplasmaaftersevereburninjury.MethodsK
5、Csofnormalratswereisolatedwithportalveincatheter,intrahepaticdigestionanddensitygradientcenˉtrifugation.Intracellularcalciumconcentration([Ca2+]i)inindividualKCafterstimulatedwithpostburnserumwasasˉsessedfluorometricallywithmicrospectrofluorometer.LevelofTNFαinthesupernat
6、antofKCculturedwithpostburnserumwasdetectedbyELISA.SDratsunderwent30%TBSAfullthicknessburn.Sixhourslater,KCwereisolatedandtheirtotalRNAwasextracted.LevelofTNFαmRNAwasdetectedbyribonucleaseprotectionassay.LevelofplasmaTNFαwasalsodetected.Roleofnimodipineonabove-mentionedef
7、fectswereobserved.ResultsComparedwiththatofcontrolgroup,[Ca2+]iofKCandlevelofTNFαinsupernatantinburngroupincreasedsignificantly.Atpresentof1μMnimodipine,however,thenumericalvaluedecreasedsignificantly.Comparedwiththatofcontrolgroup,levelofKCmRNAandplasmaTNFαinburngroupals
8、oincreasedsignificantly.Afterintravenouslyinjectionwithnimodipine(40μg?kg-1?h-1),thenumericalval
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