Peptides in shrimp hemolymph play an important role in the innate immune response.Analysis of hemolymph will help to detect and identify potential novel biomarkers of microbial infection.We used magnetic bead-based pu...Peptides in shrimp hemolymph play an important role in the innate immune response.Analysis of hemolymph will help to detect and identify potential novel biomarkers of microbial infection.We used magnetic bead-based purification(ClinProt system) and matrix-assisted laser desorption/ionization time of flight mass spectrometry(MALDI-TOF MS) to characterize shrimp hemolymph peptides.Shrimp serum and plasma were used as the source of samples for comparative analysis,and it was found that serum was more suitable for shrimp hemolymph peptidomic analysis.To screen potential specific biomarkers in serum of immune-challenged shrimps,we applied magnetic bead-based MALDI-TOF MS to serum samples from 10 immune-challenged and 10 healthy shrimps.The spectra were analyzed using FlexAnalysis 3.0 and ClinProTools 2.1 software.Thirteen peptide peaks significantly different between the two groups were selected as candidate biomarkers of lipopolysaccharide(LPS)-infection.The diagnostic model established by genetic algorithm using five of these peaks was able to discriminate LPS-challenged shrimps from healthy control shrimps with a sensitivity of 90% and a specificity of 100%.Our approach in MALDITOF MS-based peptidomics is a powerful tool for screening bioactive peptides or biomarkers derived from hemolymph,and will help to enable a better understanding of the innate immune response of shrimps.展开更多
目的建立基于ssDNA适配子的慢性粒细胞性白血病K562细胞的检测方法。方法利用Cell-SELEX(Sys-tematic evolution of ligands by exponential enrichment)技术获得针对K562细胞的高特异性ssDNA适配子,以双位点结合模式试验原理,结合生物...目的建立基于ssDNA适配子的慢性粒细胞性白血病K562细胞的检测方法。方法利用Cell-SELEX(Sys-tematic evolution of ligands by exponential enrichment)技术获得针对K562细胞的高特异性ssDNA适配子,以双位点结合模式试验原理,结合生物素链霉亲和素磁珠技术,建立K562细胞的特异性检测方法,并验证其特异性及灵敏度。结果利用建立的方法分别检测K562细胞、HL-60细胞及空白对照细胞,K562组与HL-60组和空白对照组荧光强度值差异有统计学意义(P<0.01),HL-60组与空白对照组差异无统计学意义(P>0.05),表明该方法特异性强;该方法能检测出数量小于100个的K562细胞,检测阈值低,灵敏度高。结论已成功建立了基于ssDNA适配子的检测K562细胞的新方法,为慢性粒细胞性白血病的分子诊断提供了一种新方法,也为分离K562细胞表面物质提供了新的思路。展开更多
基金Supported by the National Natural Science Foundation of China(No.30600458)
文摘Peptides in shrimp hemolymph play an important role in the innate immune response.Analysis of hemolymph will help to detect and identify potential novel biomarkers of microbial infection.We used magnetic bead-based purification(ClinProt system) and matrix-assisted laser desorption/ionization time of flight mass spectrometry(MALDI-TOF MS) to characterize shrimp hemolymph peptides.Shrimp serum and plasma were used as the source of samples for comparative analysis,and it was found that serum was more suitable for shrimp hemolymph peptidomic analysis.To screen potential specific biomarkers in serum of immune-challenged shrimps,we applied magnetic bead-based MALDI-TOF MS to serum samples from 10 immune-challenged and 10 healthy shrimps.The spectra were analyzed using FlexAnalysis 3.0 and ClinProTools 2.1 software.Thirteen peptide peaks significantly different between the two groups were selected as candidate biomarkers of lipopolysaccharide(LPS)-infection.The diagnostic model established by genetic algorithm using five of these peaks was able to discriminate LPS-challenged shrimps from healthy control shrimps with a sensitivity of 90% and a specificity of 100%.Our approach in MALDITOF MS-based peptidomics is a powerful tool for screening bioactive peptides or biomarkers derived from hemolymph,and will help to enable a better understanding of the innate immune response of shrimps.
文摘目的建立基于ssDNA适配子的慢性粒细胞性白血病K562细胞的检测方法。方法利用Cell-SELEX(Sys-tematic evolution of ligands by exponential enrichment)技术获得针对K562细胞的高特异性ssDNA适配子,以双位点结合模式试验原理,结合生物素链霉亲和素磁珠技术,建立K562细胞的特异性检测方法,并验证其特异性及灵敏度。结果利用建立的方法分别检测K562细胞、HL-60细胞及空白对照细胞,K562组与HL-60组和空白对照组荧光强度值差异有统计学意义(P<0.01),HL-60组与空白对照组差异无统计学意义(P>0.05),表明该方法特异性强;该方法能检测出数量小于100个的K562细胞,检测阈值低,灵敏度高。结论已成功建立了基于ssDNA适配子的检测K562细胞的新方法,为慢性粒细胞性白血病的分子诊断提供了一种新方法,也为分离K562细胞表面物质提供了新的思路。
