title: [Expression and recombination mechanism of SNC73 (IgHalpha1) in human epithelial cancer cell line].
abstract: OBJECTIVE
  To study if the gene SNC73 (IgHalpha1) is expressed in human epithelial cancer cell line and to interpret the recombination mechanism.
  
  
  METHODS
  Human epithelial cancer cells of SW480 line were cultured. RT-PCR and Western blotting were used to examine the expression of SNC73, recombination activating gene 1 (RAG1), and RAG2. The RT-PCR products were confirmed by sequencing. Immunohistochemistry was used to detect the expression of IgHalpha1, Igkappa, and Iglambda in these epithelial cancer cells.
  
  
  RESULTS
  The human epithelial cancer cell line (SW480) positively expressed SNC73, RAG1, and RAG2. IgHalpha1 and Igkappa was strongly expressed in SW480 cells, but Iglambda was undetectable. The sequence of the constant region of SNC73 in SW480 cells is identical to that of IgA1. Both sequencing and Western blotting showed that the RAG1 and RAG2 expressed in SW480 cells were identical to that expressed in pre-B lymphocytes.
  
  
  CONCLUSIONS
  Immunoglobulin alpha-1 gene is expressed in non-lymphoid cells, which may be a potential genetic marker for the development of colorectal cancer. Recombination signal sequence (RSS)-mediated recombination may take part in the rearrangement of immunoglobulin alpha-1 gene in human epithelial cancer cell line.
authors.affiliation: Cancer Institute, Zhejiang University, Hangzhou 310009, China.
authors.forename: Li-Yi
authors.initials: LY
authors.lastname: Geng
authors.forename: Shu
authors.initials: S
authors.lastname: Zheng
authors.forename: Jia-Ping
authors.initials: JP
authors.lastname: Peng
mesh_terms: D045744:Cell Line, Tumor; D015179:Colorectal Neoplasms / Q000235:genetics / Q000378:metabolism*; D004268:DNA-Binding Proteins / Q000096:biosynthesis* / Q000235:genetics; D015972:Gene Expression Regulation, Neoplastic; D005803:Genes, Immunoglobulin / Q000235:genetics; D018398:Homeodomain Proteins / Q000096:biosynthesis* / Q000235:genetics; D006801:Humans; D007136:Immunoglobulins / Q000096:biosynthesis / Q000235:genetics; D009687:Nuclear Proteins; D011506:Proteins / Q000235:genetics / Q000378:metabolism*; D012333:RNA, Messenger / Q000096:biosynthesis
chemical_list: D004268:DNA-Binding Proteins; D018398:Homeodomain Proteins; D007136:Immunoglobulins; D009687:Nuclear Proteins; D011506:Proteins; D012333:RNA, Messenger; C499311:RAG2 protein, human; C452824:IGHA1 protein, human; C064655:V(D)J recombination activating protein 2; C064658:RAG-1 protein