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Objective Drug resistance is the main reason for chemotherapy failure ,it is to be solved how to overcome this . Recent studies indicate that epithelial-mesenchymaltransition (EM T ) may involved in chemotherapy resistance for some types of cancers .But it is still unknown whether EM T is involved in chemotherapy resistance for colorectal carcinoma .This study was con-ducted to investigate the relation between EM T and colorectal cancer chemotherapy resistance .Methods Abilities of migration and invasion of Oxaliplatin resistant colorectal carcinoma cell lines LOVO /L-OHP and wild type colorectal carcinoma cell lines LOVO were investigated by transwell migration and transwell invasion assays .The level of E-cadherin and Vimentin was detected by West-ern blot .EM T of LOVO was induced by GSK-3β inhibitor SB415286 treatment and validated by transwell migration and transwell invasion assays and Western blot for E-cadherin and Vimentin .The sensitivity of LOVO to Oxaliplatin after SB 415286 inducing EM T was evaluated by M TT and Annexin-V /PI assays .Results EM T phenotype was confirmed by morphology feature ,results of transwell migration and invasion assays and level changes of E-cadherin and Vimentin .In addition ,the results of proliferation and apoptosis tests showed that the sensitivity of LOVO to Oxaliplatin after SB 415286 inducing EM T decreased significantly ,which means chemotherapy resistance .Conclusion The direct association between EM T and chemotherapy resistance for colorectal carci -noma is proved in this study ,which provides basis for intervening chemotherapy resistance and new researching strategies .
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Objective To investigate the basic electrical rhythms in vivo and distribution of interstitial cells of Cajal(ICC),and the effect of blockade of C-KIT on them in the Balb/c murine small intestine.Methods New-born murine were intraperitoneally with injected antibody to C-KIT(ACK_(2))(100 ?g) every second day,and control groups were injected saline.The basic electrical rhythms in vivo were determined and the distribution of ICC was observed by immunohistochemistry when the murine were 10 days postpartum.Results The basic electrical rhythms in vivo were proximal cosinal waves in control groups and irregular in ACK_(2) groups.The frequency and the amplitude in ACK_(2) groups were significantly lower than that in control groups(P
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Objective To study the effects and reasons caused by different sex on the teaching of ligation in fundamental surgery. Methods Students of grade 2005 were chosen,and then sc10.35 statistical software was used to analyze these four different departments’data and independent-samples T test to compare the data of 2 groups. Results It showed a statistical significance(P
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OBJECTIVE: To elucidate the effects of lipopolysaccharide (LPS), phospholipase A(2) (PLA(2)) and oxygen free radical (OFR) on proton transmembrane translocation and H(+)-ATPase. METHODS: The normal rats were sacrificed for preparetion liver mitochondria and submitochondrial particles for experiments in vitro. Submitochondrial particles were incubated with LPS (100 &mgr;g/mL), PLA(2) (10 u/mL) and FeSO(4)/Vit C (30/90 &mgr;mol/L) at 30 degrees C for 30 min. The proton translocation of submitochondrial particles (SMPs) were assayed with the fluorescent probe ACMA (9-amino-6-chloro-2 methoxya cridine). The mitochondria were incubated with different concentration of LPS, PLA(2) and FeSO(4)/Vit C. The H(+)-ATPase, PLA(2) and malondialdehyde (MDA) were assayed. RESULTS: The fluorescent quenching of ACMA and H(+)-ATPase activity in high dose was significantly decreased after treatment with LPS, PLA(2), FeSO(4)/Vit C (P<0.05). The mitochondrial PLA(2) activity and MDA content were significantly increased after treatment with LPS (P<0.01). CONCLUSIONS: FeSO(4)/Vit C in low dose causes increases H(+)-ATPase activity. LPS, PLA(2), FeSO(4)/Vit C might be the important factors changing H(+)-ATPase and proton translocation across the membrane.