RESUMO
The specificity of nucleic acids' binders is crucial for developing this kind of drug, especially for novel G-quadruplexes' binders. Quindoline derivatives have been developed as G-quadruplex stabilizers with good interactive activities. In order to improve the selectivity and binding affinity of quindoline derivatives as c-myc G-quadruplex binding ligands, novel triazole containing benzofuroquinoline derivatives (T-BFQs) were designed and synthesized by using the 1,3-dipolar cycloaddition of a series of alkyne and azide building blocks. The selectivity toward c-myc G-quadruplex DNA of these novel T-BFQs was significantly improved, together with an obvious increase on binding affinity. Further cellular and in vivo experiments indicated that the T-BFQs showed inhibitory activity on tumor cells' proliferation, presumably through the down-regulation of transcription of c-myc gene. Our findings broadened the modification strategies of specific G-quadruplex stabilizers.
Assuntos
Antineoplásicos/farmacologia , Descoberta de Drogas , Quadruplex G/efeitos dos fármacos , Proteínas Proto-Oncogênicas c-myc/antagonistas & inibidores , Quinolonas/farmacologia , Triazóis/farmacologia , Animais , Antineoplásicos/síntese química , Antineoplásicos/química , Linhagem Celular , Proliferação de Células/efeitos dos fármacos , Química Click , Relação Dose-Resposta a Droga , Regulação para Baixo/efeitos dos fármacos , Ensaios de Seleção de Medicamentos Antitumorais , Humanos , Camundongos , Camundongos Nus , Modelos Moleculares , Estrutura Molecular , Neoplasias Experimentais/tratamento farmacológico , Neoplasias Experimentais/patologia , Proteínas Proto-Oncogênicas c-myc/genética , Proteínas Proto-Oncogênicas c-myc/metabolismo , Quinolonas/síntese química , Quinolonas/química , Relação Estrutura-Atividade , Termodinâmica , Triazóis/químicaRESUMO
At present, wt1, a Wilms' tumor suppressor gene, is recognized as a critical regulator of tumorigenesis and a potential therapeutic target. WT1 shows the ability to regulate the transcription of bcl-2 by binding to a GC-rich region in the promoter, which can then fold into a special DNA secondary structure called the G-quadruplex. This function merits the exploration of the effect of a G-quadruplex ligand on the binding and subsequent regulation of WT1 on the bcl-2 promoter. In the present study, WT1 was found to bind to the double strand containing the G-quadruplex-forming sequence of the bcl-2 promoter. However, the G-quadruplex ligand SYUIQ-FM05 effectively blocked this binding by interacting with the GC-rich sequence. Our new findings are significant in the exploration of new strategies to block WT1's transcriptional regulation for cancer-cell treatment.
RESUMO
BACKGROUND: Low birth weight (LBW) might be a risk factor for acquiring lower respiratory tract infections (LRTIs) associated with disease related complications in early childhood. HFMD, a frequent viral infection in southern China, is a leading cause of lower respiratory tract infections in children. We analyzed whether LBW is a risk factor for children with HFMD to develop lower respiratory tract infections. METHODS: A total of 298 children with HFMD, admitted to a hospital in Qingyuan city, Guangdong province, were recruited. Demographic data and clinical parameters such as serum glucose level and inflammatory markers including peripheral white blood cell count, serum C-reactive protein, and erythrocyte sedimentation rate were routinely collected on admission. Birth weight data were derived from birth records. RESULTS: Mean birth weight (BW) was 167 g lower in patients with HFMD and LRTIs as compared to patients with solely HFMD (p = 0.022) and the frequency of birth weight below the tenth percentile was significantly higher in patients with HFMD and LRTIs (p = 0.002). CONCLUSIONS: The results of the study show that low birth weight is associated with a higher incidence of lower respiratory tract infections in young children with HFMD.
