RESUMO
Alzheimer's disease is a common cause of dementia, for which no disease-modifying therapy is yet available. Aß3-10-KLH, a vaccine for active immunization, has been shown to prevent pathological changes in young transgenic models of AD, but the effects of treatment with it and its effects on mitochondrial dysfunction remain unclear. We immunized 6-month-old Tg-APPswe/PSEN1dE9 mice with Aß3-10-KLH to analyze whether it is capable of eliminating amyloid-ß after its appearance. The vaccine effectively decreased amyloid-ß deposits, improved cognitive function and ameliorated mitochondrial dysfunction. These results indicate the potential of Aß3-10-KLH as a vaccine to treat AD.
Assuntos
Doença de Alzheimer/genética , Doença de Alzheimer/prevenção & controle , Vacinas contra Alzheimer/uso terapêutico , Precursor de Proteína beta-Amiloide/genética , Transtornos Cognitivos/prevenção & controle , Transtornos Cognitivos/psicologia , Doenças Mitocondriais/prevenção & controle , Presenilina-1/genética , Vacinas/uso terapêutico , Doença de Alzheimer/psicologia , Precursor de Proteína beta-Amiloide/imunologia , Precursor de Proteína beta-Amiloide/metabolismo , Animais , Cognição , Humanos , Aprendizagem em Labirinto , Camundongos , Camundongos Endogâmicos C57BL , Camundongos Transgênicos , Doenças Mitocondriais/metabolismoRESUMO
Krüppel-like factors (KLFs) are transcription factors that control the expression of downstream genes. The role of KLFs has been reported in cancers. KLF16 promotes the proliferation of gastric cancer cells by upregulating p21, while suppresses the tumorigenesis of glioma through targeting TFAM. The function of KLF16 is controversial in cancer development. In this study, we aimed to investigate the role of KLF16 in retinoblastoma (RB). KLF16 was highly expressed in RB tissues and cells. Overexpression of KLF16 promoted the proliferation, growth and migration of RB cells. By contrast, KLF16 interference showed opposite effects. Cell cycle arrest and apoptosis were induced or repressed by KLF16 knockdown or overexpression, respectively. Mechanistically, BCL2 like 15 (BCL2L15), an apoptosis gene, was negatively regulated by KLF16. Luciferase reporter and ChIP assay showed that KLF16 transcriptionally repressed the expression of BCL2L15 by binding to its promoter. BCL2L15 was lowly expressed in RB tissues. Additionally, overexpression of BCL2L15 inhibited the proliferation and increased the apoptosis in RB cells. Our study identifies that KLF16 contributes to RB cell proliferation and migration by negatively regulating BCL2L15.
Assuntos
Regulação Neoplásica da Expressão Gênica , Fatores de Transcrição Kruppel-Like/genética , Proteínas Proto-Oncogênicas c-bcl-2/genética , Neoplasias da Retina/genética , Epitélio Pigmentado da Retina/metabolismo , Retinoblastoma/genética , Apoptose/genética , Ciclo Celular/genética , Linhagem Celular Tumoral , Movimento Celular , Proliferação de Células , Células Epiteliais/metabolismo , Células Epiteliais/patologia , Genes Reporter , Humanos , Fatores de Transcrição Kruppel-Like/antagonistas & inibidores , Fatores de Transcrição Kruppel-Like/metabolismo , Luciferases/genética , Luciferases/metabolismo , Proteínas Proto-Oncogênicas c-bcl-2/antagonistas & inibidores , Proteínas Proto-Oncogênicas c-bcl-2/metabolismo , RNA Interferente Pequeno/genética , RNA Interferente Pequeno/metabolismo , Neoplasias da Retina/metabolismo , Neoplasias da Retina/patologia , Epitélio Pigmentado da Retina/patologia , Retinoblastoma/metabolismo , Retinoblastoma/patologia , Transdução de Sinais , Transcrição GênicaRESUMO
Objective To build an efficient random short hairpin RNA(shRNA)library. Methods shRNA expression vector was constructed with enhanced green fluorescent protein(EGFP)in the upstream of shRNA,driven by pol â ¡ promoter(CMV).After the constructs were transfected into cells,the proteins were collected.The inhibition efficiency of shRNA was determined by Western blot and dual luciferase reporter system.After the shRNA expression vector was constructed with EGFP in the upstream of shRNA,driven by pol â ¡ promoter(CMV),shRNA was further embedded into microRNA(miRNA)context.The constructs were transfected into cells,and then the inhibition efficiency of shRNA against target genes was evaluated by quantificational real-time polymerase chain reaction.According to the result of quantificational real-time polymerase chain reaction,a new random shRNA library was constructed based on miRNA context. Results shRNA downstream of a large transcript was transcripted efficiently by pol â ¡ promoter(CMV).The efficiency of shRNA interference on target gene was improved when shRNA was embedded into miRNA context.Thus,we constructed a new random shRNA library sized 1.8×107 based on miRNA context.Conclusion We successfully constructed a new large random shRNA library.
Assuntos
Biblioteca Gênica , MicroRNAs/genética , RNA Interferente Pequeno/genética , Vetores Genéticos , Luciferases , Regiões Promotoras GenéticasRESUMO
OBJECTIVE: To investigate the role of TXNDC5 in serum starvation-induced proliferation inhibition of HeLa cell. METHODS: TXNDC5 was either over-expressed or knocked down by small interfering RNA (siRNA) in HeLa cells which were then cultured in conventional medium or serum starvation medium. The protein level of TXNDC5 was evaluated by Western blot analysis. The mRNA level of TXNDC5 was measured by quantitative real-time PCR. Cell growth rate was determined by cell proliferation assay kit (MTS method). Cell cycle distribution and apoptosis were detected by flow cytometry. RESULTS: Serum starvation mildly reduced the mRNA level of TXNDC5 (P<0.05), but dramatically increased the protein level of TXNDC5 in HeLa cells. The stability of TXNDC5 mRNA remained unchanged. Cycloheximide abolished the serum starvation-induced up-regulation of TXNDC5 protein. Over-expression of TXNDC5 had no effect on cell proliferation. However, suppression of TXNDC5 attenuated the proliferation inhibition of HeLa cell induced by serum starvation (P<0.05), increased the proportion of cells in S phase (P<0.05), but had no effect on cell apoptosis. CONCLUSION: TXNDC5 mediates serum starvation-induced proliferation inhibition of HeLa cell.
