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Cell surface molecular changes on the activation of human thymocytes.

F Sanchez-Madrid, M L Toribio, F Gambón and M O de Landazuri
J Immunol December 1, 1985, 135 (6) 3938-3943;
F Sanchez-Madrid
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M L Toribio
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F Gambón
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M O de Landazuri
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Abstract

The changes in the expression of antigen molecules on the cell surface membranes of uncultured (nonactivated) and activated human thymocytes have been studied by flow cytometry and immunoprecipitation techniques. Nonactivated thymocytes do not have the phenotypic profile of a resting population because they express cell proliferation molecules such as the transferrin receptor and the 4F2 antigens (mainly the 100,000 dalton subunit). After activation with IL 2-containing supernatants, mature T3+, T6- thymocytes proliferate and are able to nonspecifically kill different target cells. The activated thymocytes are T3+, T11+, T6-, OKM1- and bear T4 or T8 antigens in mutually exclusive cell subpopulations. They also "de novo" express the IL 2 receptor, and the 210.000/130.000 molecular complex defined by the TS2/7 MAb. Activated human thymocytes express higher amounts of class I and class II MHC antigens, equal T3 and LFA-1, and lower quantities of T11 and T4 molecules than nonactivated thymocytes. Furthermore, activated thymocytes only express the T8 34,000 dalton polypeptide subunit, whereas the nonactivated thymocyte population expressed the T8 34,000 dalton associated with a 46,000 glycoprotein. We have demonstrated that this structural change in the T8 molecule from a complex of two polypeptide subunits of 46,000 and 32,000 does not indeed occur in the activation process but rather in the maturation from T6+ to T6- thymocytes.

  • Copyright © 1985 by American Association of Immunologists

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The Journal of Immunology
Vol. 135, Issue 6
1 Dec 1985
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Cell surface molecular changes on the activation of human thymocytes.
F Sanchez-Madrid, M L Toribio, F Gambón, M O de Landazuri
The Journal of Immunology December 1, 1985, 135 (6) 3938-3943;

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Cell surface molecular changes on the activation of human thymocytes.
F Sanchez-Madrid, M L Toribio, F Gambón, M O de Landazuri
The Journal of Immunology December 1, 1985, 135 (6) 3938-3943;
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Print ISSN 0022-1767        Online ISSN 1550-6606