RESUMO
Objective To study the effect and mechanism of the thapsigargin combined with gefitinib on the proliferation of human lung adenocarcinoma gefitinib resistance cell line PC9/GR. Methods The cell viability of PC9/GR treated with gefitinib alone or gefitinib combined with thapsigargin was evaluated by CCK8 assay. The flow cytometry was used to analyze the PC9/GR cell apoptosis indued by the two group drugs. The ATF-6 and IRE1α protein expression of PC9/GR cells treated with the two group drugs were detected by Western blotting. Results The group of drug combination exhibited enhanced ability to inhibit cell proliferation, promote cell apoptosis and upregulate the ATF-6 and IRE1α protein expression of the PC9/GR compared with the group gefitinib used alone. Conclusion The sensitivity of PC9/GR to gefitinib was increased when the cells were treated by thapsigargin, which may be related with the state of endoplasmic reticulum stress（ERS） induced by thapsigargin.
RESUMO
T cell receptor-gene engineered T cells (TCR-T) therapy is a kind of tumor adoptive immunotherapy based on the modified T cells, which can generate a strong anti-tumor immune effect in vivo by virtue of its high affinity recognition of tumor-specific antigens. Many I/II-phase clinical trials have shown the safety and effectiveness of TCR-T in treatment of solid tumors, especially melanoma and synovial cell sarcoma. However, the clinical immunotherapy of TCR-T cells has also brought some challenges, such as off-target toxicity, cytokine release syndrome and neurotoxicity. It is predicted that the efficacy and safety of TCR-T immunotherapy can be improved by screening for high-affinity TCRs, reducing adverse reactions of TCR-T cell immunotherapy and other ways. And with the deepening of research, TCR-T immunotherapy will bring new hope to the patients with tumor.
RESUMO
Objective Using an in vivo adeno-associated virus(AAV)-mediated gene transfer technique,this study was designed to evaluate the protective effects of human osteoprotegerin(OPG)transgene against joint destruction in collagen induced arthritis(CIA)model.MethodsAfter CIA was established in the Sprague-Dawley rats,the experimental animals were treated with PBS or rAAV-EGFP or rAAV-hOPG (100μl/d)intra-articular injection 25 days after arthritis induction for 10 days.Paraffin-embedded joints were then analyzed histologically.The joint destruction was evaluated by Larsen Score.The protein expression of OPG,IL-1,MMP-3 was identified by enzyme-linked immunosorbent assay(ELISA).Results Suecessful trans-gene expression was confirmed by the detection of OPG by ELISA and positive fluorescence of the frozen joint section. Image analysis revealed that the expression of OPG significantly protected against joint destruction by 30% compared with the CIA group. Conclusion OPG gene transfer mediated by rAAV effectively protects against bone destruction induced by CIA model. Those data suggest that gene transferring using rAAV-OPG may be a feasible and effective therapeutic approach to treat or prevent joint destruction in inflammatory arthritis.
RESUMO
Objective This study was designed to investigate the expression changes of osteopro-tegerin (OPG), tartrate-resistant acid phosphatase (TRAP) and vascular endothelial growth factor (VEGF) mRNA in collagen induced arthritis(CIA) rats. Methods After CIA was induced in Sprague-Dawley rats, the experimental animals were treated with PBS or rAAV-EGFP or rAAV-hOPG (100 μl/day) intra-articular injection for 10 days. Messenger RNAs (mRNAs) were obtained from CIA synovium 40days after first immun-ization. Reverse transcriptase-polymerase chain reactions (RT-PCR) were carried out to detect the mRNA encoding OPG, TRAP, VEGF and β-actin, which acted as inner control. The genes detected clearly by RT-PCR were quantified using real-time PCR. Results The expression of all genes was confirmed by specific single bands in RT-PCR. Real-time PCR showed that the expression levels of TRAP and VEGF were increased, whereas those of OPG mRNA were decreased in CIA group compared with normal controls. The intra-articular gene transduction markedly increased the gene copies of OPG by 128.21% (P<0.01). The expression change of OPG in synovium also caused the decrease of the expression levels of TRAP and VEGF by 58.79% (P<0.01)and 17.85% (P>0.05) respectively, however, the expression change of VEGF was not statistically significant. Conclusion OPG gene mediated by rAAV can be successfully tranfered to knee joint synovium in vivo. The results of this study suggest that gene transfer using rAAV-OPG may be a feasible and effective therapeutic approach to treat or prevent joint destruction in inflammatory arthritis.
