A murine cDNA encodes a pan-epithelial glycoprotein that is also expressed on plasma cells

Peter Leif Bergsagel, Carol Victor-Kobrin, Cynthia R. Timblin, Jane Trepel, W. Michael Kuehl

Research output: Contribution to journalArticle

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Abstract

Using a subtractive cDNA approach, we have identified a number of genes expressed in murine plasmacytomas, but not B or pre-B lymphomas. One of these genes, 289A, expresses a 1.8-kb microsomally localized mRNA that encodes a 314-amino-acid protein containing a signal sequence and a hydrophobic transmembrane domain. Sequence comparison suggests that the predicted protein is the murine homologue of a human cell surface pan-epithelial glycoprotein known variously as EGP, GA733-2, KSA, and KS1/4, recognized by mAb HEA125, GA733, KS1/4, CO17-1A, M74, and 323/A3. The 289A mRNA is highly expressed in normal murine tissues containing epithelial cells, and at a low level in plasma cells induced by LPS stimulation of spleen B lymphocytes. It is expressed in 15 of 16 plasmacytomas, but at a much lower level, if at all, in pre-B or B lymphomas. In human B cell lines, 289A detects a 1.5-kb mRNA in the myeloma cell line 8226, but not in Burkitt's lymphoma or lymphoblastoid cell lines. Subsequent FACS analysis of human cell lines with the mAb GA733 and KS1/4 demonstrated concordant expression of the mRNA and the protein. We conclude that 289A is the murine homologue of EGP, GA733-2, KSA, and KS1/4 Ag. Although its expression was previously thought to be restricted to epithelial cells, it is also expressed in plasma cells and is a B lymphocyte differentiation Ag. Because of the multiplicity of names, we propose calling the human gene hEGP314, and the murine gene mEGP314.

Original languageEnglish (US)
Pages (from-to)590-596
Number of pages7
JournalJournal of Immunology
Volume148
Issue number2
StatePublished - Jan 15 1992
Externally publishedYes

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Plasma Cells
Glycoproteins
Complementary DNA
Cell Line
Messenger RNA
B-Lymphocytes
Plasmacytoma
Genes
Lymphoma
Epithelial Cells
Proteins
Burkitt Lymphoma
Protein Sorting Signals
Names
Spleen
Amino Acids

ASJC Scopus subject areas

  • Immunology

Cite this

Bergsagel, P. L., Victor-Kobrin, C., Timblin, C. R., Trepel, J., & Kuehl, W. M. (1992). A murine cDNA encodes a pan-epithelial glycoprotein that is also expressed on plasma cells. Journal of Immunology, 148(2), 590-596.

A murine cDNA encodes a pan-epithelial glycoprotein that is also expressed on plasma cells. / Bergsagel, Peter Leif; Victor-Kobrin, Carol; Timblin, Cynthia R.; Trepel, Jane; Kuehl, W. Michael.

In: Journal of Immunology, Vol. 148, No. 2, 15.01.1992, p. 590-596.

Research output: Contribution to journalArticle

Bergsagel, PL, Victor-Kobrin, C, Timblin, CR, Trepel, J & Kuehl, WM 1992, 'A murine cDNA encodes a pan-epithelial glycoprotein that is also expressed on plasma cells', Journal of Immunology, vol. 148, no. 2, pp. 590-596.
Bergsagel PL, Victor-Kobrin C, Timblin CR, Trepel J, Kuehl WM. A murine cDNA encodes a pan-epithelial glycoprotein that is also expressed on plasma cells. Journal of Immunology. 1992 Jan 15;148(2):590-596.
Bergsagel, Peter Leif ; Victor-Kobrin, Carol ; Timblin, Cynthia R. ; Trepel, Jane ; Kuehl, W. Michael. / A murine cDNA encodes a pan-epithelial glycoprotein that is also expressed on plasma cells. In: Journal of Immunology. 1992 ; Vol. 148, No. 2. pp. 590-596.
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