title: Heat shock induces expression of OSTC/DC2, a novel subunit of oligosaccharyltransferase, in vitro and in vivo.
abstract: Mammalian oligosaccharyltransferase complex subunit OSTC/DC2 protein has recently been shown to be a new subunit of the oligosaccharyltransferase; however, its physiological role is still unclear. Here, we report the expression pattern of OSTC/DC2 protein in the context of heat shock stress. Its upregulation was detected both in cells treated with heat shock in vitro and in an animal model of heat shock in vivo. Northern blot analysis indicated that OSTC/DC2 mRNA is ubiquitously expressed in various human tissues, with abundant expression in the placenta and liver. The temporal changes of OSTC/DC2 protein expression following acute heat shock in human malignant glioblastoma cell line U87MG and mice were analyzed by Western blot assay. In general, expression of OSTC/DC2 protein was elevated after heat shock; however, the time courses of the change of OSTC/DC2 protein expression varied in different tissues. In the cerebellum, heat shock induction of OSTC/DC2 protein and activation of AKT, a key regulator of stress response, followed a similar time course. These results suggest that the upregulation of OSTC/DC2, a novel component of the oligosaccharyltransferase complex, is part of the mammalian heat shock response.
authors.affiliation: Department of Biological Sciences, National Sun Yat-Sen University, Kaohsiung, Taiwan.
authors.forename: Chien-Ming
authors.initials: CM
authors.lastname: Chen
authors.affiliation: Graduate Institute of Natural Products, Kaohsiung Medical University, Kaohsiung, Taiwan.
authors.forename: Chao-Neng
authors.initials: CN
authors.lastname: Tseng
authors.affiliation: Center for Immunology and Microbial Diseases, Albany Medical College, Albany, NY, USA.
authors.forename: Jonathan J
authors.initials: JJ
authors.lastname: Cho
authors.affiliation: Department of Biological Sciences, National Sun Yat-Sen University, Kaohsiung, Taiwan.
authors.forename: Ya-Zhe
authors.initials: YZ
authors.lastname: Lee
authors.affiliation: Tzu Hui Institute of Technology, Pingtung County, Taiwan.
authors.forename: Chiu-Li
authors.initials: CL
authors.lastname: Kao
authors.affiliation: Graduate Institute of Natural Products, Kaohsiung Medical University, Kaohsiung, Taiwan.
authors.forename: Yuan-Bin
authors.initials: YB
authors.lastname: Cheng
authors.affiliation: Department of Biochemistry, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.
authors.forename: Yi-Ren
authors.initials: YR
authors.lastname: Hong
authors.affiliation: Department of Biological Sciences, National Sun Yat-Sen University, Kaohsiung, Taiwan. Electronic address: clcho@mail.nsysu.edu.tw.
authors.forename: Chung-Lung
authors.initials: CL
authors.lastname: Cho
mesh_terms: D000818:Animals; D045744:Cell Line, Tumor; D002531:Cerebellum / Q000201:enzymology; D020869:Gene Expression Profiling; D018869:Heat-Shock Response / Q000235:genetics; D006602:Hexosyltransferases / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D008565:Membrane Proteins / Q000235:genetics / Q000378:metabolism*; D008807:Mice, Inbred BALB C; D010766:Phosphorylation; D021122:Protein Subunits / Q000235:genetics / Q000378:metabolism*; D051057:Proto-Oncogene Proteins c-akt / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism
chemical_list: D008565:Membrane Proteins; D021122:Protein Subunits; D012333:RNA, Messenger; D006602:Hexosyltransferases; C025620:dolichyl-diphosphooligosaccharide - protein glycotransferase; D051057:Proto-Oncogene Proteins c-akt
keywords: AKT; Heat shock; OSTC/DC2; Oligosaccharyltransferase