OBJECTIVE： This study evaluated the responses of some antioxidant parameters in selected tissues of Plasmodium berghei-infected mice treated with cysteine-stabilized peptide fraction（CSPF） of aqueous extract of Mor...OBJECTIVE： This study evaluated the responses of some antioxidant parameters in selected tissues of Plasmodium berghei-infected mice treated with cysteine-stabilized peptide fraction（CSPF） of aqueous extract of Morinda lucida leaf.METHODS：Fifty-six mice were randomly divided into seven groups.Group A（normal control）was uninfected and received 5%dimethyl sulfoxide（DMSO）.Mice in Groups B（negative control）,C,D,E and F were inoculated with P.berghei NK65 and were administered with 5%DMSO and 15.63,31.25,61.5 and 125 mg/kg body weight of CSPF respectively.Group G animals,were also inoculated with P.berghei NK65,and received 20 mg/kg body weight of chloroquine.The administration lasted for three days,after which malondialdehyde（MDA）concentration and various antioxidant parameters in selected tissues of mice were determined on days 4 and 8 postinoculation.RESULTS：The results revealed that MDA concentration was significantly increased（P〈0.05）in the tissues of the negative control and chloroquine-treated groups.The increased MDA concentration was reduced by CSPF in a dose-dependent manner,which was significant（P〈0.05）at higher doses.The activities of superoxide dismutase,catalase,glutathione peroxidase,glutathione reductase and glutathioneS-transferase and the concentration of reduced glutathione were significantly reduced（P〈0.05）in the tissues of the negative control animals compared to the normal controls.This observed reduction in the negative control animals was reverted in a dose-dependent manner in infected animals given CSPF,even to the range of the normal controls at highest dose,as did chloroquine.CONCLUSION：The results suggest that CSPF of M.lucida leaf extract may induce the antioxidant defense system in vivo against Plasmodium species infection.展开更多
目的探讨蝎毒多肽(peptide extract from scorpion venom,PESV)对白血病干细胞(leukemic stem cell,LSC)在体内多药耐药(multidrug resistance,MDR)的影响。方法培养K562/A02细胞,在对数生长期收集并经免疫磁珠法分选出K562/A02干细胞备...目的探讨蝎毒多肽(peptide extract from scorpion venom,PESV)对白血病干细胞(leukemic stem cell,LSC)在体内多药耐药(multidrug resistance,MDR)的影响。方法培养K562/A02细胞,在对数生长期收集并经免疫磁珠法分选出K562/A02干细胞备用;40只BABL/c裸鼠,取5只注射K562/A02干细胞形成皮下瘤块备用;采用随机数字表法将35只裸鼠分为正常对照组、模型组、耐阿霉素(Adriamycin,ADM)组、PESV组和ADM+PESV高、中、低剂量组,每组5只。正常对照组不作处理,其余各组包埋瘤块组织,造模后模型组给予1 m L生理盐水腹腔注射,每天1次;ADM组腹腔注射ADM 0.05 mg,隔天1次;PESV组腹腔注射PESV 2μg,每天1次;ADM+PESV高、中、低剂量组腹腔注射ADM 0.05 mg,隔天1次,同时给予PESV(5、2、1μg)腹腔注射,每天1次。给药14天。流式细胞术检测P-糖蛋白(P-glycoprotein,P-gp);RT-PCR检测乳腺癌耐药蛋白(breast cancer resistance protein,BCRP)、多药耐药基因1(multidrug resistance 1,MDR1)m RNA表达;免疫组化法检测乙醛脱氢酶1(aldehyde dehydrogenase 1,ALDH1);Western blot法检测磷脂酰肌醇3激酶(phosphoinositide 3-kinase,PI3K)蛋白表达;ELISA检测核转录因子NF-κB含量。结果 K562/A02细胞经免疫磁珠分选前后的CD34+CD38-细胞比率分别为31.5%、92.8%,耐药率(IC50)分别为(60.33±10.68)μg/m L、(58.33±9.72)μg/m L,造模裸鼠成瘤率为100%。与模型组比较,ADM组各项检测指标比较,差异无统计学意义(P>0.05);PESV组BCRP、MDR1 m RNA和NF-κB因子水平比较,差异均有统计学意义(P<0.05);ADM+PESV高、中、低剂量组P-gp值降低,PI3K蛋白表达下调(P<0.05),ADM+PESV高、中剂量组BCRP m RNA表达降低,MDR1 m RNA表达升高,差异均有统计学意义(P<0.05);ADM+PESV高剂量组PI3K蛋白表达下调,差异有统计学意义(P<0.05)。分别与ADM组和PESV组比较,ADM+PESV高剂量组P-gp、BCRP m RNA、MDR1 m RNA、PI3K和NF-κB水平明显均下调,差异有统计学意义(P<0.05)。各组ALDH1阳性率�展开更多
文摘OBJECTIVE： This study evaluated the responses of some antioxidant parameters in selected tissues of Plasmodium berghei-infected mice treated with cysteine-stabilized peptide fraction（CSPF） of aqueous extract of Morinda lucida leaf.METHODS：Fifty-six mice were randomly divided into seven groups.Group A（normal control）was uninfected and received 5%dimethyl sulfoxide（DMSO）.Mice in Groups B（negative control）,C,D,E and F were inoculated with P.berghei NK65 and were administered with 5%DMSO and 15.63,31.25,61.5 and 125 mg/kg body weight of CSPF respectively.Group G animals,were also inoculated with P.berghei NK65,and received 20 mg/kg body weight of chloroquine.The administration lasted for three days,after which malondialdehyde（MDA）concentration and various antioxidant parameters in selected tissues of mice were determined on days 4 and 8 postinoculation.RESULTS：The results revealed that MDA concentration was significantly increased（P〈0.05）in the tissues of the negative control and chloroquine-treated groups.The increased MDA concentration was reduced by CSPF in a dose-dependent manner,which was significant（P〈0.05）at higher doses.The activities of superoxide dismutase,catalase,glutathione peroxidase,glutathione reductase and glutathioneS-transferase and the concentration of reduced glutathione were significantly reduced（P〈0.05）in the tissues of the negative control animals compared to the normal controls.This observed reduction in the negative control animals was reverted in a dose-dependent manner in infected animals given CSPF,even to the range of the normal controls at highest dose,as did chloroquine.CONCLUSION：The results suggest that CSPF of M.lucida leaf extract may induce the antioxidant defense system in vivo against Plasmodium species infection.
文摘目的探讨蝎毒多肽(peptide extract from scorpion venom,PESV)对白血病干细胞(leukemic stem cell,LSC)在体内多药耐药(multidrug resistance,MDR)的影响。方法培养K562/A02细胞,在对数生长期收集并经免疫磁珠法分选出K562/A02干细胞备用;40只BABL/c裸鼠,取5只注射K562/A02干细胞形成皮下瘤块备用;采用随机数字表法将35只裸鼠分为正常对照组、模型组、耐阿霉素(Adriamycin,ADM)组、PESV组和ADM+PESV高、中、低剂量组,每组5只。正常对照组不作处理,其余各组包埋瘤块组织,造模后模型组给予1 m L生理盐水腹腔注射,每天1次;ADM组腹腔注射ADM 0.05 mg,隔天1次;PESV组腹腔注射PESV 2μg,每天1次;ADM+PESV高、中、低剂量组腹腔注射ADM 0.05 mg,隔天1次,同时给予PESV(5、2、1μg)腹腔注射,每天1次。给药14天。流式细胞术检测P-糖蛋白(P-glycoprotein,P-gp);RT-PCR检测乳腺癌耐药蛋白(breast cancer resistance protein,BCRP)、多药耐药基因1(multidrug resistance 1,MDR1)m RNA表达;免疫组化法检测乙醛脱氢酶1(aldehyde dehydrogenase 1,ALDH1);Western blot法检测磷脂酰肌醇3激酶(phosphoinositide 3-kinase,PI3K)蛋白表达;ELISA检测核转录因子NF-κB含量。结果 K562/A02细胞经免疫磁珠分选前后的CD34+CD38-细胞比率分别为31.5%、92.8%,耐药率(IC50)分别为(60.33±10.68)μg/m L、(58.33±9.72)μg/m L,造模裸鼠成瘤率为100%。与模型组比较,ADM组各项检测指标比较,差异无统计学意义(P>0.05);PESV组BCRP、MDR1 m RNA和NF-κB因子水平比较,差异均有统计学意义(P<0.05);ADM+PESV高、中、低剂量组P-gp值降低,PI3K蛋白表达下调(P<0.05),ADM+PESV高、中剂量组BCRP m RNA表达降低,MDR1 m RNA表达升高,差异均有统计学意义(P<0.05);ADM+PESV高剂量组PI3K蛋白表达下调,差异有统计学意义(P<0.05)。分别与ADM组和PESV组比较,ADM+PESV高剂量组P-gp、BCRP m RNA、MDR1 m RNA、PI3K和NF-κB水平明显均下调,差异有统计学意义(P<0.05)。各组ALDH1阳性率�
