title: Differential expression of oxidored nitro domain containing protein 1 (NOR1), in mouse tissues and in normal and cancerous human tissues.
abstract: Oxidored nitro domain containing protein 1 (NOR1) is usually restrictively expressed in the brain and testis. Detection of altered NOR1 expression could help us to identify its functions in cell growth, differentiation, metabolism, or even carcinogenesis. In this study, NOR1 homologues were identified in multiple species through GenBank search. NOR1 is a novel protein conserved in multiple species. Mouse NOR1 shared high homology with human NOR1. Furthermore, NOR1 expression was analyzed in mouse tissues by using RT-PCR, Western blot, and immunohistochemistry. The data showed that NOR1 is broadly expressed in neurons of mouse brain and the expression profile changes during postnatal development of the mouse brain. Moreover, in non-nervous tissues, strong immunostaining for NOR1 protein was observed in the testis, epididymis and trachea. In addition, expression of human NOR1 protein in different normal and cancerous human tissues was analyzed via search of the human RNA and protein databases; the data showed that although most malignant cells weakly stained or were negative for NOR1 expression, the liver cancer cells displayed moderate to strong expression of NOR1. These data suggested that NOR1 might serve as a cancer/testis/brain antigen in cells, and that altered NOR1 expression in liver cancer may help us to elucidate the functions of NOR1 protein in liver carcinogenesis.
authors.affiliation: Cancer Research Institute, Xiangya School of Medicine, Central South University, Changsha 410078, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Xiang
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.forename: Wenjuan
authors.initials: W
authors.lastname: Li
authors.forename: Xiayu
authors.initials: X
authors.lastname: Li
authors.forename: Xiaoling
authors.initials: X
authors.lastname: Li
authors.forename: Guiyuan
authors.initials: G
authors.lastname: Li
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001921:Brain / Q000378:metabolism*; D017124:Conserved Sequence; D004268:DNA-Binding Proteins / Q000378:metabolism*; D019992:Databases as Topic; D006801:Humans; D008113:Liver Neoplasms / Q000378:metabolism; D008297:Male; D026901:Membrane Transport Proteins / Q000378:metabolism*; D051379:Mice; D009369:Neoplasms / Q000378:metabolism*; D009419:Nerve Tissue Proteins / Q000378:metabolism*; D010802:Phylogeny; D011987:Receptors, Steroid / Q000378:metabolism*; D011988:Receptors, Thyroid Hormone / Q000378:metabolism*; D016415:Sequence Alignment; D013737:Testis / Q000378:metabolism*
chemical_list: D004268:DNA-Binding Proteins; D026901:Membrane Transport Proteins; D009419:Nerve Tissue Proteins; C490411:Nr4a3 protein, mouse; C479458:OSCP1 protein, human; D011987:Receptors, Steroid; D011988:Receptors, Thyroid Hormone