MICA, a new polymorphic HLA-related antigen, is expressed mainly by keratinocytes, endothelial cells, and monocytes

Norberto W. Zwirner, Marcelo A. Fernández-Viña, Peter Stastny

Research output: Contribution to journalArticle

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Abstract

MICA is a new polymorphic gene in the HLA region expressed in epithelial cell lines and gastrointestinal epithelium. Little is yet known about the MICA protein, and the pattern of its expression by freshly isolated cells has not been established. In the present experiments, we used antibodies raised in rabbits against α1 and α2 domain-peptides to study the expression of MICA. By western blot and immunoprecipitation, we detected a band of 62,000 M(r) in various cell lines (THP-1, U937, HeLa, A431, Raji, MOLT-4, and HUV-EC-C) and in freshly isolated keratinocytes, endothelial cells, and monocytes but not in CD4+ and CD8+ T cells, and CD19+ cells (B lymphocytes). It was not possible to up-regulate the expression of MICA in different cells by stimulation with γ-interferon, but the expression of MICA was induced in phytohemagglutinin-stimulated T cells. We confirmed that MICA is expressed at the cell surface by flow cytometry. Results of immunoprecipitation studies of β2-microglobulin(β2m)- or MICA-depleted, metabolically labeled HeLa cells indicated that MICA was not associated with β2m. Although the function of MICA is still unknown, its restricted pattern of tissue expression, the fact that it is expressed on the cell surface, and its polymorphic nature suggest that this new molecule, encoded close to HLA class I, may play a role in the interaction between epithelial cells and cells of the immune system.

Original languageEnglish (US)
Pages (from-to)139-148
Number of pages10
JournalImmunogenetics
Volume47
Issue number2
DOIs
StatePublished - 1998

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HLA Antigens
Keratinocytes
Monocytes
Endothelial Cells
Immunoprecipitation
Epithelial Cells
T-Lymphocytes
Cell Line
Phytohemagglutinins
HeLa Cells
Interferons
Immune System
Flow Cytometry
B-Lymphocytes
Up-Regulation
Epithelium
Western Blotting
Rabbits
Antibodies
Genes

Keywords

  • Endothelial cells
  • HLA class Ib
  • Keratinocytes
  • MICA
  • Western blot

ASJC Scopus subject areas

  • Immunology
  • Genetics

Cite this

MICA, a new polymorphic HLA-related antigen, is expressed mainly by keratinocytes, endothelial cells, and monocytes. / Zwirner, Norberto W.; Fernández-Viña, Marcelo A.; Stastny, Peter.

In: Immunogenetics, Vol. 47, No. 2, 1998, p. 139-148.

Research output: Contribution to journalArticle

Zwirner, Norberto W. ; Fernández-Viña, Marcelo A. ; Stastny, Peter. / MICA, a new polymorphic HLA-related antigen, is expressed mainly by keratinocytes, endothelial cells, and monocytes. In: Immunogenetics. 1998 ; Vol. 47, No. 2. pp. 139-148.
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