Objective This study is aimed at observing the role of long noncoding RNAs(lncR NAs) in the pathogenesis of abdominal aortic aneurysm(AAA).Methods Lnc RNA and m RNA expression signatures of AAA tissues and normal abdominal aortic tissues(NT) were analyzed by microarray and further verified by Real-time quantitative reverse-transcription PCR(q RT-PCR).The lnc RNAs-m RNAs targeting relationships were identified using computational analysis.The effect of lnc-ARG on 5-lipoxygenase(ALOX5) expression was tested in HeL a cells.Results Differential expressions of 3,688 lncR NAs and 3,007 m RNAs were identified between AAA and NT tissues.Moreover,1,284 differentially expressed long intergenic noncoding RNAs and 206 differentially expressed enhancer-like lnc RNAs adjacent to protein-coding genes were discerned by bioinformatics analysis.Some differentially expressed lncR NAs and m RNAs between AAA and normal tissue samples were further verified using q RT-PCR.A co-expression network of coding and noncoding genes was constructed based on the correlation analysis between the differentially expressed lnc RNAs and mR NAs.In addition,the lnc-ARG located within the upstream of ALOX5 was sorted as a noncoding transcript by analyzing the protein-coding potential using computational analysis.Furthermore,we found that lnc-ARG can decrease the m RNA level of ALOX5 and reactive oxygen species production in He La cells.Conclusion This study revealed new lnc RNA candidates are related to the pathogenesis of AAA. Objective This study was aimed at observing the role of long noncoding RNAs (lncR NAs) in the pathogenesis of abdominal aortic aneurysm (AAA). Methods Lnc RNA and m RNA expression signatures of AAA tissues and normal abdominal aortic tissues (NT) were analyzed by microarray and further verified by Real-time quantitative reverse-transcription PCR (q RT-PCR) .The lnc RNAs-m RNAs targeting relationships were identified using computational analysis. The effect of lnc-ARG on 5-lipoxygenase (ALOX5) expression was tested in HeL a cells. Results Differential expressions of 3,688 lncR NAs and 3,007 m RNAs were identified between AAA and NT tissues. Moreover, 1,284 differentially expressed long intergenic noncoding RNAs and 206 differentially expressed enhancer-like lnc RNAs adjacent to protein-coding genes were discerned by bioinformatics analysis. Some differentially expressed lncR NAs and m RNAs between AAA and normal tissue samples were further verified using q RT-PCR. A co-expression network of coding an d noncoding genes were constructed on the correlation analysis between the differentially expressed lnc RNAs and mR NAs. addition, the lnc-ARG located within the upstream of ALOX5 was sorted as a noncoding transcript by analyzing the protein-coding potential using computational analysis. Furthermore, we found that lnc-ARG can decrease the m RNA level of ALOX5 and reactive oxygen species production in He La cells. Contact this Research revealed new lnc RNA candidates are related to the pathogenesis of AAA.