Down-regulation of LFA-1 adhesion receptors by C-myc oncogene in human B lymphoblastoid cells - PubMed (original) (raw)

. 1990 Nov 2;250(4981):682-6.

doi: 10.1126/science.2237417.

Affiliations

• PMID: 2237417
• DOI: 10.1126/science.2237417

Down-regulation of LFA-1 adhesion receptors by C-myc oncogene in human B lymphoblastoid cells

G Inghirami et al. Science. 1990.

Abstract

The function of the c-myc gene and its role in tumorigenesis are poorly understood. In order to elucidate the role of c-myc oncogene activation in B cell malignancy, the phenotypic changes caused by the expression of c-myc oncogenes in human B lymphoblastoid cells immortalized by Epstein-Barr virus were analyzed. C-myc oncogenes caused the down-regulation of lymphocyte function-associated antigen-1 (LFA-1) adhesion molecules (alpha L/beta 2 integrin) and loss of homotypic B cell adhesion in vitro. Down-regulation of LFA-1 occurred by (i) posttranscriptional modulation of LFA-1 alpha L-chain RNA soon after acute c-myc induction, and (ii) transcriptional modulation in cells that chronically express c-myc oncogenes. Analogous reductions in LFA-1 expression were detectable in Burkitt lymphoma cells carrying activated c-myc oncogenes. Since LFA-1 is involved in B cell adhesion to cytotoxic T cells, natural killer cells, and vascular endothelium, these results imply functions for c-myc in normal B cell development and lymphomagenesis.

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