RESUMO
In 2013 a new reassortant avian influenza A H7N9 virus emerged in China, causing human infection with high mortality. An accurate and timely diagnosis is crucial for controlling the outbreaks of the disease. We therefore propose a simple strategy for rapidly and sensitively detecting the H7N9 virus using an intensity-modulated surface plasmon resonance (IM-SPR) biosensor integrated with a new generated monoclonal antibody. The novel antibody exhibits significant specificity to recognize H7N9 virus compared with other clinical human influenza isolates (p < 0.01). Experimentally, the detection limit of the proposed approach for H7N9 virus detection is estimated to be 144 copies/mL, which is a 20-fold increase in sensitivity compared with homemade target-captured ELISA using the identical antibody. For the measurement of mimic clinical specimens containing the H7N9 virus mixed with nasal mucosa from flu-like syndrome patients, the detection limit is calculated to be 402 copies/mL, which is better than conventional influenza detection assays; quantitative reverse transcription polymerase chain reaction (qRT-PCR) and rapid influenza diagnostic test (RIDT). Most importantly, the assay time took less than 10 min. Combined, the results of this study indicate that the proposed simple strategy demonstrates high sensitivity and time-saving in H7N9 virus detection. By incorporating a high specific recognizer, the proposed technique has the potential to be used in applications and development of other emerging or re-emerging microbe detection platforms.
Assuntos
Anticorpos Imobilizados/química , Anticorpos Monoclonais/química , Subtipo H7N9 do Vírus da Influenza A/isolamento & purificação , Influenza Aviária/diagnóstico , Influenza Humana/diagnóstico , Ressonância de Plasmônio de Superfície/instrumentação , Animais , Anticorpos Imobilizados/imunologia , Anticorpos Monoclonais/imunologia , Aves , Desenho de Equipamento , Glicoproteínas de Hemaglutininação de Vírus da Influenza/imunologia , Humanos , Subtipo H7N9 do Vírus da Influenza A/imunologia , Influenza Aviária/virologia , Influenza Humana/virologia , Limite de Detecção , Ressonância de Plasmônio de Superfície/economia , Ressonância de Plasmônio de Superfície/métodosRESUMO
AIM To investigate the effects of Shenge Powder (Ginseng Radix et Rhizoma,Gecko) on heart function in rats with heart failure by coarctation of abdominal aorta and its mechanism of action.METHODS The heart failure rats were fed with Shenge Powder [1.89 g/(kg · d)] or bisoprolol [1 mg/(kg · d)] for twelve weeks.The pathological morphology,hemodynamics,cardiographic index and effect on protein expression of PGC-1 α in sham operation group,model group,Shenge Powder group and Bisoprolol group were observed.RESULTS Compared with the model group,Shenge Powder increased ejection fraction (EF) (P ＜ 0.05),decreased left ventricular end-diastolic pressure (LVEDP) (P ＜ 0.01),improved maximal rate of left ventricular pressure development (dp/dtmax) and maximal rate of left ventricular pressure decay (dp/dtmin) (P ＜ 0.01),reduced myocardial tissue lesions and myocardial fibrosis.There was no significant difference in PGC-1α protein expression between the Shenge Powder group and the model group.CONCLUSION Shenge Powder can improve left ventricular function in rats with heart failure,and reduce the pathological changes of myocardium tissue.
RESUMO
AIM To investigate the effects of Shenge Powder (Ginseng Radix et Rhizoma,Gecko) on heart function in rats with heart failure by coarctation of abdominal aorta and its mechanism of action.METHODS The heart failure rats were fed with Shenge Powder [1.89 g/(kg · d)] or bisoprolol [1 mg/(kg · d)] for twelve weeks.The pathological morphology,hemodynamics,cardiographic index and effect on protein expression of PGC-1 α in sham operation group,model group,Shenge Powder group and Bisoprolol group were observed.RESULTS Compared with the model group,Shenge Powder increased ejection fraction (EF) (P ＜ 0.05),decreased left ventricular end-diastolic pressure (LVEDP) (P ＜ 0.01),improved maximal rate of left ventricular pressure development (dp/dtmax) and maximal rate of left ventricular pressure decay (dp/dtmin) (P ＜ 0.01),reduced myocardial tissue lesions and myocardial fibrosis.There was no significant difference in PGC-1α protein expression between the Shenge Powder group and the model group.CONCLUSION Shenge Powder can improve left ventricular function in rats with heart failure,and reduce the pathological changes of myocardium tissue.
