A useful helicobacter pylori-induced gastritis model using BALB/c mice was established for mimicking of human gastritis induced by Helicobacter pylori (H. pylori). The H. pylori isolates were obtained freshly from a...A useful helicobacter pylori-induced gastritis model using BALB/c mice was established for mimicking of human gastritis induced by Helicobacter pylori (H. pylori). The H. pylori isolates were obtained freshly from a human complex ulcer patient. BALB/c mice were fasted for 24 h and then 0.25 mL of 0.2 mol·L -1 NaHCO 3 was administered after by gavage to each mouse and 0.5 mL of 10 9 colonies formation unit per milliliter (CFU/mL) of H. pylori was administered 15 min. On the 3 rd day and 5 th day, the H. pylori inoculations were repeated. The inoculated mice were sacrificed in batch on the 5 th day, in the 2 nd week, 3 rd week and 4 th week. The gastric mucous membrane near pyloric portion was removed, treated and then cultured under microaerobic condition for detection of H.pylori. The remainders of the gastric membrane were fixed by 10% formaldehyde solution for pathological detection. The results showed that the H. pylori could be separated from the gastric membranes of inoculated mice. Obvious invasion of inflammatory cells in the gastric membranes of inoculated mice could be observed from pathological sections. It can be concluded that the inoculating fresh human H. pylori isolates can produce mouse gastritis. This model of BALB/c mice can be used for evaluating the therapeutic agents for the treatment of gastritis induced by H. pylori.展开更多
We have previously shown that the lipofuscin in the brain seems to have in-creased in amount in autopsy cases of epidemic hemorrhagic fever.The purpose of thisstudy was to testify if there is really such an increase.L...We have previously shown that the lipofuscin in the brain seems to have in-creased in amount in autopsy cases of epidemic hemorrhagic fever.The purpose of thisstudy was to testify if there is really such an increase.Lipfuscin in 10 sections from everybrain of 10 autopsy cases,stained with Sudan Ⅳ,Sudan black and H.E.,was carefully es-timated and found to be greatly increased as compared with the controls of the same agewithout brain disease.Animal experiment was also conducted on 15 sucking BALB/c miceby I.P.inoculation of 100 LD<sub>50</sub>（0.05ml）of strain Chen of hemorrhagic fever virus,andon 15 mice without inoculation as controls.No lipofuscin was detected in the controls.However,in the brains of experimental mice,lipofuscin was found to be markedly in-creased,especially in the necrotic cells.The findings suggest that the over-productionand deposition of lipofuscin may be a mild change caused by the virus and its related fac-tors,which might be enhanced by hypotension and shock.展开更多
文摘A useful helicobacter pylori-induced gastritis model using BALB/c mice was established for mimicking of human gastritis induced by Helicobacter pylori (H. pylori). The H. pylori isolates were obtained freshly from a human complex ulcer patient. BALB/c mice were fasted for 24 h and then 0.25 mL of 0.2 mol·L -1 NaHCO 3 was administered after by gavage to each mouse and 0.5 mL of 10 9 colonies formation unit per milliliter (CFU/mL) of H. pylori was administered 15 min. On the 3 rd day and 5 th day, the H. pylori inoculations were repeated. The inoculated mice were sacrificed in batch on the 5 th day, in the 2 nd week, 3 rd week and 4 th week. The gastric mucous membrane near pyloric portion was removed, treated and then cultured under microaerobic condition for detection of H.pylori. The remainders of the gastric membrane were fixed by 10% formaldehyde solution for pathological detection. The results showed that the H. pylori could be separated from the gastric membranes of inoculated mice. Obvious invasion of inflammatory cells in the gastric membranes of inoculated mice could be observed from pathological sections. It can be concluded that the inoculating fresh human H. pylori isolates can produce mouse gastritis. This model of BALB/c mice can be used for evaluating the therapeutic agents for the treatment of gastritis induced by H. pylori.
基金Project was supported by the National Natural Science Foundation of China No.38 970 335
文摘We have previously shown that the lipofuscin in the brain seems to have in-creased in amount in autopsy cases of epidemic hemorrhagic fever.The purpose of thisstudy was to testify if there is really such an increase.Lipfuscin in 10 sections from everybrain of 10 autopsy cases,stained with Sudan Ⅳ,Sudan black and H.E.,was carefully es-timated and found to be greatly increased as compared with the controls of the same agewithout brain disease.Animal experiment was also conducted on 15 sucking BALB/c miceby I.P.inoculation of 100 LD<sub>50</sub>（0.05ml）of strain Chen of hemorrhagic fever virus,andon 15 mice without inoculation as controls.No lipofuscin was detected in the controls.However,in the brains of experimental mice,lipofuscin was found to be markedly in-creased,especially in the necrotic cells.The findings suggest that the over-productionand deposition of lipofuscin may be a mild change caused by the virus and its related fac-tors,which might be enhanced by hypotension and shock.
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阳性率比较,差异均无统计学意义(P>0.05)。结论 PESV联合ADM具有下调白血病K562/A02干细胞P-gp、BCRP、MDR1、PI3K、NF-κB的表达水平,可以增强白血病K562/A02干细胞在体内对ADM的敏感度,具有逆转其多药耐药作用。
