大骨节病关节软骨真菌毒素环境反应基因表达谱研究

摘要

Objective To compare the expression profile of mycotoxin-related environmental response genes (MERGs) in the articular cartilage of patients with Kashin-Beck disease (KBD) and healthy controls,and explore the relationship between MERG and KBD.Methods Articular cartilage specimens were collected from 9 healthy human subjects and 9 adult KBD patients.Agilent microarray was used to evaluate the expression levels of MERG in cartilage specimens,and the expression ratios of MERG between KBD and healthy controls were calculated.GSEA software was used to calculate the NES scores and P values of gene ontology(GO).Results ①T-2 toxin,deoxynivalenol,zearalenone,aflatoxin B1,fumonisin B1 and ochratoxin A related 15 MERGs presented expression differences between KBD and healthy controls(ratios ＞ 2.0 or ＜ 0.5).Thirteen MERGs were up-regulated in KBD,including BAX,BCL2,COL5A2,FER1L3,GSTT2,IGFBP2,IGFBP4,PDE8B,SOCS3,THBS1,TMSL8,VGLL3 and TUBB2A (ratio ＞ 2.0).Two MERGs,POSTN and FABP4,were down-regulated in KBD (ratio ＜ 0.5).The 15 MERGs were involved in various biological processes; such as collage synthesis,apoptosis,metabolism,growth & development and so on.②Mycotoxin related 4 apoptosis GOs and 5 growth & development related GOs were up-regulated in KBD compared to healthy controls(NES ＞ 0),including ANTI_APOPTOSIS,REGULATION_OF_PROGRAMMED_CELL_DEATH,APOPTOSIS_GO,REGULATION_OF_APOPTOSIS,ORGAN_MORPHOGENESIS,ANATOMICAL_STRUCTURE_DEVELOPMENT,ORGAN_DEVELOPMENT,SYSTEM_DEVELOPMENT and REGULATION OF DEVELOPMENTAL_PROCESS (NES ＞ 0 and P ＜ 0.05).Conclusions There are multiple mycotoxins related environmental response genes presenting significant expression difference between KBD cartilage and normal cartilage.Mycotoxin can affect the expression of MERGs in KBD articular cartilage,which might lead to dysfunction of chondrocytes,and articular cartilage lesions.%目的 比较分析真菌毒素环境反应基因在大骨节病(Kashin-Beck disease,KBD)和正常关节软骨中的表达谱差异,探讨真菌毒素环境反应基因与KBD软骨损伤的关系.方法 采集9例KBD患者和9例正常对照关节软骨样本,提取总RNA.采用Agilent基因表达芯片评估真菌毒素环境反应基因在软骨样品中的表达量,并计算每个基因在KBD和正常对照软骨中表达量的比率(简称表达率).采用GSEA软件计算每个基因功能分类表达量的NES指数及P值.结果 ①T-2毒素、脱氧镰刀菌烯醇、玉米赤霉烯酮、黄曲霉毒素B1、伏马菌素B1和赫曲霉毒素A相关的15个环境反应基因在KBD和正常对照关节软骨中的表达水平存在差异(表达率＞2.0或＜0.5),其中13个基因在KBD软骨中上调,包括BAX、BCL2、COL5A2、FER1L3、GSTT2、IGFBP2、IGFBP4、PDE8B、SOCS3、THBS1、TMSL8、VGLL3和TUBB2A(表达率＞2.0)；2个基因在KBD软骨中下调,包括POSTN和FABP4(表达率＜0.5).上述15个基因功能主要涉及胶原、细胞凋亡、代谢和生长发育等.②真菌毒素相关的4个凋亡基因功能分类和5个生长发育基因功能分类在KBD关节软骨中上调(NES＞0),包括ANTI_APOPTOSIS、REGULATION OF PROGRAMMED_CELL_DEATH、APOPTOSIS_GO、EGULATION_OF_APOPTOSIS、ORGAN MORPHOGENES IS、ANATOMICAL_STRUCTURE_ DEVELOPMENT、ORGAN_DEVELOPMENT、SYSTEM DEVELOPMENT和REGULATION—OF_DEVELOPMENTAL_PROCESS (NES＞0且P＜ 0.05).结论 KBD软骨中存在多种真菌毒素的环境反应基因表达且显著不同于正常对照,提示真菌毒素可能通过影响相关环境反应基因在关节软骨中的表达,诱发软骨细胞功能障碍和关节软骨损伤.