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Cell Regulation logoLink to Cell Regulation
. 1990 Mar;1(4):359–367. doi: 10.1091/mbc.1.4.359

The leukocyte integrin LFA-1 reconstituted by cDNA transfection in a nonhematopoietic cell line is functionally active and not transiently regulated.

R S Larson 1, M L Hibbs 1, T A Springer 1
PMCID: PMC361493  PMID: 1712636

Abstract

The functional activity of lymphocyte function-associated antigen 1 (LFA-1) on leukocytes can be regulated by T-cell receptor (TCR) stimulation and pharmacologic agents. It was of interest to determine if functionally active LFA-1 could be reconstituted on a nonhematopoietic, LFA-1-negative cell line. We report the expression of LFA-1 and diethylaminoethyl (DEAE) Mac-1 alpha beta heterodimers on the cell surface of a fibroblastoid cell line, COS, by DEAE dextran cotransfection of the alpha and beta subunit cDNAs. Immunoprecipitation studies demonstrated that the alpha and beta subunit was expressed in heterodimers. The alpha or beta subunit was expressed at lower levels after transfection with the alpha or beta subunit cDNA alone. Cotransfection of the alpha and beta subunit cDNAs, but not transfection of alpha or beta alone, was sufficient to reconstitute intercellular adhesion molecule-1 (ICAM-1) binding activity. Consistent with this observation, LFA-1 on the fibroblastoid cells possesses the activation epitope defined by the L16 monoclonal antibody (mAb). This epitope marks the conversion of LFA-1 from the low to high avidity state on peripheral blood T lymphocytes (PBLs) and is constitutively present on activated cell lines. In contrast to LFA-1 on leukocytes, the functional activity of LFA-1 on fibroblastoid cells was not influenced by phorbol ester treatment. Furthermore, the use of agents that interfere with intracellular signaling, a protein kinase C inhibitor, cAMP analogue, or the combination of a phosphodiesterase inhibitor and adenyl cyclase activator, did not affect the binding of COS cells expressing LFA-1 to purified ICAM-1.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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