凝集生长毛乳头细胞分泌性蛋白组的初步分析

A preliminary analysis of the secretome of aggregated dermal papilla cells

目的 了解毛乳头细胞在凝集生长状态下分泌性蛋白组的表达.方法 以凝集和非凝集生长的毛乳头细胞为研究对象,分别制备分泌性蛋白质,以双向凝胶电泳技术和PDQuest软件分析二者之间的蛋白图谱的差异,通过基质辅助激光解吸电离飞行时间串联质谱（MLDI-TOF-MS）鉴定表达差异的蛋白质,通过蛋白质数据库NCBInr检索分析.结果 建立了重复性好、分辨率高的双向电泳图谱;在凝集生长和非凝集生长的毛乳头细胞分泌性蛋白质中分别检测到（1 134±52）个和（1 078±36）个蛋白点,大多匹配.按照差异量在5倍以上的标准,二者存在差异蛋白质28个,经过MLDI-TOF-MS质谱鉴定出10种差异表达蛋白点,其中8种蛋白质表达上调,分别为RhoGDP分离抑制剂1、细丝蛋白A、胱抑素C、纤维连接蛋白、亲环素A、前胶原C端蛋白酶增强子、组织金属蛋白酶抑制剂、组织金属蛋白酶-2抑制剂.2种蛋白质表达下调,为神经肽h3和基质金属蛋白酶-3金属蛋白酶组织抑制剂-1复合物复合物.结论 凝集生长和非凝集生长毛乳头细胞差异蛋白主要涉及信号通路、细胞增殖与分化、细胞外基质合成及降解等功能.

Objective To study the expression ot secreted proteins in aggregated dermal papilla cells （DPCs）.Methods DPCs were isolated from human scalp tissue and subjected to primary culture and subculture.Aggregated and non-aggregated DPCs served as the subject of this study.Secreted proteins were prepared from these cells and subjected to two-dimensional polyacrylamide gel electrophoresis.Differentially expressed proteins were screened by the PDQuest image analysis software.Protein spots were digested and identified by matrix-assisted laser desorption/ionization time-of-flight （MALDI-TOF） mass spectrometry,and finally analyzed using the National Center for Biotechnology Information （NCBI） non-redundant （Nr） protein database.Results Two-dimensional electrophoresis maps with good repeatability and high resolution were established.Image analysis of 2-D gels revealed that the average number of detected protein spots was 1 134 ± 52 and 1 078 ± 36 in aggregated and nonaggregated DPCs respectively,and the majority of these protein spots were matched between aggregated and nonaggregated DPCs.Twenty-eight protein spots showed more than 5-fold difference between the two groups of cells,and 10 proteins were preliminarily identified as differentially expressed proteins by peptide-mass fingerprinting.Of these differentially expressed proteins,8 proteins including Rhogdi 1,filamin A,cystatin C,fibronectin,cyclophilin A,procollagen C proteinase enhancer 1,tissue inhibitor of metalloproteinase and tissue inhibitor of metalloproteinase-2 were up-regulated,and 2 proteins including neuropolypeptide h3 and matrix metalloproteinase-3/tissue inhibitor of metalloproteinase-1 complex were down-regulated in aggregated DPCs compared with non-aggregated DPCs.Conclusions Differentially expressed proteins between aggregated and non-aggregated DPCs are mainly implicated in cell signaling pathway,cellular proliferation and differentiation,extracellular matrix synthesis and degradation,and so on.