title: ERp29 is a radiation-responsive gene in IEC-6 cell.
abstract: ERp29 is a resident protein of the endoplasmic reticulum (ER) lumen, which is thought to be involved in the folding of secretory proteins. In our previous work, it was found that, when treated with ionizing radiation (IR), the ERp29 expression was increased in mouse intestinal epithelia and cultured IEC-6 cells, which suggested that ERp29 might be a radiation-induced gene. The current work is to confirm the induction of ERp29 by IR and to analyze its role in irradiated IEC-6 cells. Our results showed that ERp29 expression was elevated by IR in IEC-6 cells at mRNA and protein levels in a time-dependent manner. IEC-6 cells with different exogenous ERp29 expression were obtained by transfection with sense and antisense expression vectors of ERp29 coding region. As ERp29 expression was inhibited, these cells exhibited more serious radiation injury and more sensitivity to IR-induced apoptosis. To further elucidate the induction of ERp29, we analyzed the XBP1 expression after IR. Results showed that the spliced form of XBP1 mRNA rapidly reached a peak at 3 hours after irradiation, which indicated that UPR sensor was involved in radiation and might be a reason to induce ERp29 expression. Our results demonstrate that ERp29 is a radiation associated protein and plays an important role in protecting cells from IR.
authors.affiliation: Institute of Combined Injury, State Key Laboratory of Trauma, Burns and Combined Injury, Third Military Medical University, Chongqing, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Zhang
authors.forename: Meng
authors.initials: M
authors.lastname: Wang
authors.forename: Yuan
authors.initials: Y
authors.lastname: Yang
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
authors.forename: Xueli
authors.initials: X
authors.lastname: Pang
authors.forename: Yongping
authors.initials: Y
authors.lastname: Su
authors.forename: Junping
authors.initials: J
authors.lastname: Wang
authors.forename: Guoping
authors.initials: G
authors.lastname: Ai
authors.forename: Zhongmin
authors.initials: Z
authors.lastname: Zou
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000502:physiology* / Q000528:radiation effects*; D002460:Cell Line; D004307:Dose-Response Relationship, Radiation; D004847:Epithelial Cells / Q000166:cytology / Q000502:physiology* / Q000528:radiation effects*; D006360:Heat-Shock Proteins / Q000378:metabolism*; D007413:Intestinal Mucosa / Q000378:metabolism* / Q000528:radiation effects*; D051379:Mice; D011829:Radiation Dosage; D011836:Radiation Tolerance / Q000502:physiology; D015854:Up-Regulation / Q000528:radiation effects
chemical_list: C491737:Erp29 protein, mouse; D006360:Heat-Shock Proteins